• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for cleaning hydraulic fluid in an industrial truck 15 with a hydraulic system comprising, a hydraulic pump 10, a hydraulic tank 11, and return line to the hydraulic tank 11 with a return filter 3, the method comprising the steps, the hydraulic pump 10 is activated for the hydraulic fluid If return flow passes through the return filter 3 to the hydraulic tank 11, the hydraulic pump 10 can be activated by means included in the industrial truck 15, when hydraulic activity is not present, to thereby create a circulation to the hydraulic tank 11 through the return filter 3 so that sufficient filtration of the hydraulic fluid is achieved. The application also relates to a single data program product, a control unit 12 and an industrial truck 15 which can perform the method.
    公开号:SE1050076A1
    申请号:SE1050076
    申请日:2010-01-25
    公开日:2011-07-26
    发明作者:Joakim Baernstroem
    申请人:Bt Products Ab；
    IPC主号:
    专利说明:

    SUMMARY OF THE INVENTION To solve the above problems, a method is hereby set forth where: cleaning of hydraulic fluid in an industrial truck is accomplished with a hydraulic system comprising, a hydraulic pump, a hydraulic tank, and return line to the hydraulic tank with a return filter, the method comprising the steps of: a the hydraulic pump is activated for hydraulic activity b. the hydraulic pump pumps the hydraulic fluid for the hydraulic activity and in connection with this a return flow takes place through the return filter to the hydraulic tank c. the hydraulic pump can be activated by means included in the industrial truck. that sufficient filtration of the hydraulic fluid is achieved.
    The effect of this is thus that a better cleaning of the hydraulic fluid can take place, by filtration in the return filter, in addition to the filtration that takes place during normal use of the hydraulic system in the industrial truck.
    By activation is meant that the hydraulic pump is either started from a standstill, or is allowed to continue its course after hydraulic activity has occurred.
    According to one embodiment, the industrial truck is arranged to automatically determine that the cleaning of the hydraulic fluid during hydraulic activity is not sufficient.
    The effect of this is that the industrial truck can maintain a certain quality of the hydraulic fluid without the operator being involved. The constipation will also be similar for different operators. This makes it easier to plan service times. It also makes it easier to plan the service life of the component hydraulic system. According to one embodiment, the industrial truck is arranged to perform the following steps; accumulate a time Take for hydraulic activity ooh one step; determine that Ta has reached a predetermined value, and based on this, the industrial truck automatically determines that the hydraulic fluid is not sufficiently cleaned of reflux via the reflux filter, during hydraulic activity.
    This has the effect that the quality of the hydraulic fluid can be determined according to a criterion that does not require direct access to the hydraulic fluid. It also provides good opportunities for adjusting cleaning intervals.
    According to one embodiment, the industrial truck is arranged to perform the following steps automatically when the hydraulic fluid is not sufficiently cleaned; activating the hydraulic pump for circulation without hydraulic activity, through the return filter, to clean the hydraulic fluid; noltställ Ta.
    This has the effect that the industrial truck can automatically start cleaning the hydraulic fluid. This is an advantage when the operator himself has difficulty assessing the need for cleaning.
    According to one embodiment, the industrial truck is arranged to accumulate a time Tb for accumulated circulation time, without hydraulic activity, and that adequate cleaning is determined by the industrial truck by one step; sufficient purity has been estimated to be achieved when the industrial truck reaches a predetermined value of accumulated Tb.
    The effect of this is that the industrial truck can be arranged via the predetermined value Tb to obtain a certain estimated quality of the hydraulic fluid, without further installations on the industrial truck.
    According to one embodiment, the industrial truck is arranged to perform feeding steps when sufficient purity has been achieved, reset Tb and end circulation without hydraulic activity.
    TO 15 20 25 30 This has the effect that the industrial truck terminates circulation without hydraulic activity, and that the industrial truck is ready to start a new cycle of cleaning immediately when a cycle is completed.
    According to one embodiment, the industrial truck is arranged to perform the following steps, with a sensor arranged in the industrial truck for measuring the quality of the oil, measuring the quality of the hydraulic fluid. The industrial truck is further arranged to perform the step; determine that a first predetermined condition for the quality of the hydraulic fluid is met, it is automatically determined that the hydraulic fluid is not sufficiently cleaned of reflux via the reflux filter, during hydraulic activity and thereby activate the hydraulic pump for circulation without hydraulic activity.
    The effect of this is that the industrial truck can use a more precise criterion than Ta to determine if the hydraulic fluid requires extra cleaning.
    According to one embodiment, the industrial truck is arranged to perform the following steps; automatically determine that sufficient purity has been achieved, during circulation without hydraulic activity, based on a predetermined second condition for the quality of the hydraulic fluid being met.
    The effect of this is that the industrial truck gets a more precise criterion for determining the quality of the hydraulic fluid, cleaning, as an effect of the circulation performed without hydraulic activity, and thus the industrial truck can determine more precisely when the cleaning is to be completed.
    According to one embodiment, the inertia truck is arranged to perform the following steps when said other conditions for the quality of the hydraulic fluid are met, terminating circulation with the hydraulic pump without hydraulic activity.
    The effect of this is that the industrial truck itself can end the cleaning block.
    This saves energy, reduces noise and more. According to one embodiment, the sensor is arranged to measure the particle adhesion of the hydraulic fluid, and that the first and / or second predetermined condition for the quality of the hydraulic fluid is constituted by a particle content value.
    According to one embodiment, the industrial truck is arranged to allow circulation without hydraulic activity only, if the driving function of the industrial truck is activated.
    This has the effect that the circulation process does not disturb the operator, acoustically.
    In addition, hydraulic function is usually not activated at the same time as travel function, so nothing disturbs the cleaning, and it can take place without too many interruptions.
    The invention also comprises a computer program product comprising computer readable code which when executed in the control unit of an industrial truck causes the industrial truck to perform the method as above. Furthermore, according to one embodiment, the control unit comprises the own unit outside a central invention which comprises the computer program product. truck computer. This has the effect that the control unit can be easily serviced and replaced.
    Different control units can be easily adapted to how the industrial truck is used, and adjustments can also be made to the control unit's hardware in a simple way.
    According to one embodiment, the control unit can be integrated in a central truck computer.
    This has the effect that no additional electronics need to be installed on the industrial truck.
    The invention also relates to an industrial truck which is arranged to be able to perform the method as above with the aid of a computer program product as above and a control unit as above.
    According to one embodiment, the industrial truck can be arranged so that activation of the hydraulic pump for circulation without hydraulic activity can take place manually. 10 15 20 25 30 The effect of this is that an operator can voluntarily decide whether cleaning of the hydraulic fluid is required. It can also be a Service Technician who makes the decision.
    According to an embodiment of the industrial truck, the manual activation of the hydraulic pump is arranged to take place via a member on the control panel of the industrial truck.
    The effect of this is a simplification for an operator to manually activate the hydraulic pump for cleaning according to the method.
    According to one embodiment, after manual activation, the industrial truck is arranged to continue circulating without hydraulic activity, until it receives a manual deactivation command.
    The effect of this is that the operator can control the process himself and achieve the cleaning he wishes.
    According to one embodiment, the industrial truck may comprise a sensor for measuring the quality of the hydraulic fluid.
    According to one embodiment, the sensor included in the industrial truck is a particle content meter.
    DESCRIPTION OF THE FIGURES Figure 1 Industrial truck according to the invention Figure 2 Hydraulic diagram in an industrial truck according to the invention Figure 3 Flow diagram for an embodiment according to the invention Figure 4 Example of circulation path in new hydraulic diagram DETAILED DESCRIPTION The invention is now described with reference to the accompanying figures. The method according to the invention consists in performing purification of the hydraulic fluid in an industrial truck 15, see figure 1. The purification is performed by introducing circulation of the hydraulic fluid when hydraulic activity does not occur. This is done by arranging the industrial truck 15 with media to perform this. The industrial truck 15 comprises a hydraulic pump 10, a hydraulic tank 11, and a return line to the hydraulic tank 11. A return filter 3 is located on the return line.
    The steps in the method are indicated by the known process for steps a and b, where a. The hydraulic pump 10 is activated for hydraulic activity b. The hydraulic pump 10 pumps the hydraulic fluid for the hydraulic activity and in connection with this there is return flow through the return filter 3 to the hydraulic tank 11. the hydraulic pump 10 can be activated by means included in the industrial truck 15, when hydraulic activity is not present, in order thereby to provide a circulation to the hydraulic tank 11 through the return filter 3 so that sufficient filtration of the hydraulic fluid is achieved.
    The basic idea is therefore that the hydraulic pump 10 can be activated when hydraulic activity is not present. What happens then is that the hydraulic fluid is circulated in the hydraulic system. The circulation takes place with a hydraulic pump 10. The pump 10 pumps liquid from the hydraulic tank 11 in a circulation which returns to the hydraulic tank 11. The liquid then passes a filter 3. The filter 3 is called a return filter. The path of the liquid through the hydraulic system during circulation is established in a manner well known to those skilled in the art. Preferably, the circulation takes place via a shunt valve from the hydraulic tank 11 to the refill filter 3 to the hydraulic tank. By activation scale is meant that the hydraulic pump 10 is either started from a standstill, or is allowed to continue its operation after hydraulic activity has occurred. See also figure 4. 10 15 20 25 30 The return filter 3 is of the low pressure type. In this context, low pressure refers to pressure in the range 0 - 1 MPa. Using a low-pressure filter is cost-effective, unlike a high-pressure filter that must be able to withstand pressures that can be 100 times higher than what is required for the low-pressure filter.
    By hydraulic activity in the above it is to be understood that the hydraulic system of the industrial truck 15 is active for hydraulic function. In this context, hydraulic activity is to be understood as the moments of time when the hydraulic system is running actively, or passively, in order to be able to perform work with a hydraulic cylinder. By active is meant that hydraulic cylinders are supplied with hydraulic fluid, or emptied of hydraulic fluid. By passive is meant that the pump is running before, between and just after work has been performed in the system. Common elements referred to in hydraulic activity are lifting and lowering movements, tilting, fork spreading, etc. During hydraulic activity, excess hydraulic fluid flows back to the hydraulic tank 11 through the reflux filter 3. Thus, the hydraulic fluid is cleaned during hydraulic activity.
    By hydraulic fluid is meant that fluid used in hydraulic systems, such as hydraulic oil, but also other fluids useful in the hydraulic system are included.
    By hydraulic pump 10 is meant a mechanical pump device. It can have a built-in drive, or have an external drive. Usually it is an external pump motor that drives the hydraulic pump 10. The pump motor is usually electrically driven. The hydraulic pump 10 may be a gear pump or other suitable pump.
    The hydraulic tank 11 is a container in the industrial truck 15 in which the hydraulic fluid is stored. The hydraulic tank 11 is usually made of plastic. However, the hydraulic tank 11 may be made of any suitable material. The hydraulic tank 11 usually has an aeration device. 10 15 20 25 3D According to a variant, the activation of the hydraulic pump 10 can take place manually. When manually activating the hydraulic pump 10, the circulation can be allowed to continue until a manual deactivation command is obtained. Preferably, the hydraulic pump 10 is activated manually by a means arranged on the control panel of the industrial truck 15. This means may preferably be a dedicated button, or another manually actuable means, such as a lever, or a steering wheel or the like. The industrial truck 15 can be arranged so that when manual activation has taken place, circulation of hydraulic oil through the re-stop filter 3 continues for a predetermined time. By manual activation of the hydraulic pump 10, is not only meant manual start of the hydraulic pump 10- The activation means either above, that the hydraulic pump '10 is either started, or allowed to continue its operation after hydraulic activity. The industrial truck 15 according to one embodiment is thus equipped for a manual start-up of the hydraulic pump 10 for circulation without hydraulic activity. Then, the industrial truck 15 is equipped with a means on the industrial truck 15 for doing so, as mentioned in connection with the method above. So it can be a button, lever or ticking. Preferably, the body is arranged on the control panel, easily accessible to the operator of the industrial truck 15. Other locations are also possible for the body.
    Activation of the hydraulic pump 10 can take place automatically. The industrial truck 15 may be arranged to be able to automatically determine whether the cleaning of the hydraulic fluid during hydraulic activity is not sufficient. This can be done in several different ways. One way for the industrial truck 15 to determine that the hydraulic fluid has not been sufficiently cleaned during hydraulic activity is for the industrial truck 15 to record a time Ta for hydraulic activity. Ta accumulates continuously during hydraulic activity, when Ta reaches a predetermined value, the truck decides on the basis of this value that the hydraulic fluid needs to be cleaned. The cleaning of the hydraulic fluid then takes place so that the hydraulic pump 10 is allowed to be activated to circulate the hydraulic fluid through the reflux filter 3, without hydraulic activity occurring, because the fail hydraulic pump 10 was already activated by previous hydraulic activity. It may also be that the hydraulic pump 10 is stationary after hydraulic activity, and in that case the industrial truck 15 is arranged to activate the hydraulic pump 10 for circulation through the return filter 3. When activating the hydraulic pump 10 for circulation without hydraulic activity, the industrial truck 15 may be arranged to reset Ta. Ta can continue to be noil set while the circulation of hydraulic activity continues. Ta is preferably '15 min, but other values for Ta are of course possible as 1 min, for large cleaning needs and 30 min, for lower cleaning needs, times between 0.5 min and 60 min are conceivable. Too long times lead to insufficient cleaning, while too short times for Ta cause you to lose, and wear hydraulic pump and equipment unnecessarily. Ta is measured as an accumulated time.
    The hydraulic pump 10 can also be activated, for circulation, via a sensor arranged in the industrial truck 15 for measuring the quality of the oil. The sensor preferably measures the particle heat in the hydraulic oil. When a particle content condition is met, the industrial truck 15 is arranged to activate the hydraulic pump 10 for circulation without hydraulic activity. The condition is usually that a predetermined value for the particle content has been reached. The condition can be adapted to operating conditions, the total operating time of the hydraulic fluid and the like.
    The sensor can also be a particle counter, and the condition that is fulfilled is then a certain number of particles that have been achieved. Other sensors are possible, for example meters of the refractive index of the hydraulic fluid. When the white cores as above are met, the industrial truck 15 automatically determines that the hydraulic fluid is not sufficiently cleaned. Thus, according to one embodiment, the industrial truck 15 comprises a sensor according to OVGTI.
    The method includes an automatic determination that sufficient purity has been achieved in the hydraulic fluid. The industrial truck 15 may be arranged to allow circulation through the return line 3 to continue for a predetermined time Tb. Tb is accumulated by the industrial truck 15 until it reaches the predetermined value. Tb is preferably 10 15 20 25 30 11 15 seconds. Tb can also assume other values, such as 5, 10, 20, 25, 30 seconds and values between them. Tb can also assume values outside the specified interval such as 40 seconds, 1 minute, 2 minutes, 5 minutes, 10 minutes. Longer times provide more efficient cleaning, while shorter times save energy and pumping equipment and reduce noise. The choice of value of Tb depends on the purity of the hydraulic fluid required after the end of circulation. Longer time provides cleaner hydraulic fluid. Tb can also assume a varying value. I.e. Tb does not have to have the same value from one time to another. Tb can, for example, have a value that is doubled every other time. Tb can also have a value that is lower every third time, and so on. Preferably, the industrial truck 15 is arranged to pause the accumulation of Tb, if hydraulic activity is initiated. When the hydraulic activity is terminated, the industrial truck 15 is preferably arranged to resume the circulation of hydraulic oil and also the accumulation of Tb. Tb can also assume different values depending on how it has been decided that circulation of hydraulic fluid without hydraulic activity should continue. For example, Tb can assume a longer value if the initialization is done manually. the industrial truck 15 may also be arranged to determine that the hydraulic fluid is sufficiently purified by circulation without hydraulic activity, based on measuring the quality of the hydraulic fluid by means of the sensor mentioned above. The industrial truck 15 can do this, for example, based on a condition for the particle content being met. For example, an achieved dry-determined minimum value for the particle content.
    The condition can also consist of a predetermined minimum number of particles in the hydraulic fluid. It can also be a predetermined value of the refractive index, which corresponds to a sufficiently cleaned hydraulic fluid.
    When the industrial truck 15 has been indicated, via achieved predetermined value of Tb or fulfilling quality conditions based on measurement on the hydraulic fluid that the hydraulic fluid is sufficiently cleaned, the industrial truck 15 is preferably arranged to automatically shut off the cleaning by circulation through the return filter 3 without hydraulic activity. 10 15 20 25 30 12 When the criteria for sufficient purity of the hydraulic fluid are met, circulation of hydraulic fluid without hydraulic activity ends. If Tb is used in the method, the industrial truck 15 is then arranged to noil steal Tb.
    According to an alternative, the determination of the industrial truck that the liquid needs to be cleaned can be based on other criteria which may be, accumulated weight being lifted, number of lifting movements, and the like. In these cases, a circulation without hydraulic activity preferably takes place for a predetermined time period Tb as above.
    According to an alternative, the industrial truck 15 can determine that circulation of hydraulic fluid without hydraulic activity should take place, based on the industrial truck 15 having been shut down. That is, the industrial truck 15 is then arranged to sense that there is a start-up of the truck and that it is a criterion for performing the method. According to a further development, the industrial truck 15 is arranged to determine whether circulation without hydraulic activity should take place based on how long a period of time the industrial truck 15 has been shut down.
    According to an alternative embodiment, the industrial truck 15 is arranged to combine the sensor values with a time Ta for hydraulic activity, in order to determine by a combination of these whether, cleaning of the hydraulic fluid with circulation through the return filter without the hydraulic activity, should take place. The industrial truck 15 can then further be arranged to combine the measured value of the sensor with time Tb for accumulated circulation time through the return filter 3 without hydraulic activity, and based on this the industrial truck 15 decides when the circulation is to be terminated. For example, the industrial truck 15 can let the sensor measure only after Ta has been reached, and if the measurement does not reach a predetermined value, Ta can be set noil and a new accumulation of Ta is allowed to take place. Similarly, the circulation can continue for a period of time Tb and then a measurement of the sensor takes place, if a predetermined value is not reached, Tb can be reset and the circulation is allowed for a further period of time Tb. According to a further development of the invention, cleaning is only allowed to continue when the travel function is activated. Driving function is de- nied in this context as the wheels of the industrial truck 15 move or the propulsion engine is active.
    The effect of this is above all that the grain fort in the inctru truck 15 is raised.
    The operation of the pump motor does not interfere, for example, if the operator has stopped. It also has the effect of using time when other hydraulic functions are not usually used. This minimizes the number of breaks in the cleaning. This in turn has the effect of reducing the total time of the cleaning process, which increases the probability that the cleaning will be completed before the industrial truck 15 ends its use and is switched off.
    An example of a hydraulic system in an industrial truck is shown in fig. 2. This includes a hydraulic fluid pump 10, a shunt valve 2, a return filter 3, hydraulic pistons 4, 40, 400 for the load handling section. The 1-hydraulic fluid pump 10 is driven by an electric motor. The hydraulic system has a number of valves to regulate the flow of hydraulic fluid to different parts of the system. The valves are preferably integrated in a valve block, which forms a unit. The valve block is usually made of steel or aluminum, where drilled channels connect the various components. In a hydraulic system according to Fig. 2 there are several possible circulation paths for the hydraulic fluid. Here is a description of the circulation path for the hydraulic fluid during circulation without hydraulic activity. The hydraulic pump 10 is activated or is activated by previous hydraulic activity. A first lifting valve 8 is closed. Thus, the pressure is built up against the pilot-controlled priority valve 9, this changes position and allows hydraulic fluid to reach a second lifting valve 5. The pressure is built up through the dashed line 7 towards the shunt valve 2 which opens. The hydraulic fluid can now circulate from the hydraulic pump 10 via the priority valve 9 to the shunt valve 2 and on to the return filter 3, to the hydraulic tank 11. From the hydraulic tank 11 the hydraulic pump 10 picks up new hydraulic fluid and the circulation of hydraulic fluid can continue. During hydraulic activity, for example, one of the lifting valves 5 is opened and then the pressure on the shunt valve 2 is lowered, which thereby closes due to a spring load, and the circulation pauses until the hydraulic activity is completed. See also figure 4 for the actual circulation path.
    The shunt valve 2 is preferably a pilot-controlled valve, which is regulated by the pressure on it, a spring keeps it in the closed position. the industrial truck 15 preferably comprises means which comprise a computer program product comprising computer readable code which when executed in the means of inclustrit truck 15 in the industrial truck 15 causes the industrial truck 15 to perform the described method. Preferably, the computer readable code is executed in a control unit 12 in the industrial truck 15. The industrial truck 15 thus preferably has a control unit 12 which is arranged to perform and control the cleaning of the hydraulic fluid. When it is mentioned in the above description that the industrial truck 15 is arranged and similar, it is understood that it is preferably the control unit included in the industrial truck that performs this. The control unit 12 is arranged to accumulate Ta. The control unit 12 is arranged to be able to determine whether Ta has reached a predetermined value. The control unit 12 is arranged to accumulate Tb.
    The control unit 12 is arranged to be able to control the cleaning process, and to determine whether a predetermined value of Tb has been reached. The control unit 12 is arranged to interpret signals from a sensor which measures the quality of the hydraulic fluid, preferably the particle content. The control unit 12 is arranged to be able to check whether the particle content has reached a predetermined value, such as a highest or lowest value. The control unit 12 is preferably programmable.
    The control unit 12 may in one embodiment consist of a separate unit. The control unit 12 is preferably part of a central truck computer.
    In other words, it is the control unit 12 that continuously checks for hydraulic activity. This can be done by checking whether commands for sending fluid to any of the hydraulic cylinders 10 15 20 25 30 15 occur. This can be done by registering a pressure change, valve opening or in any other way that shows that the industrial truck 15 hydraulic toner clones are activated, for example by one of the industrial truck 15 hydraulic cylinders moving. The invention described above is applied to industrial trucks 15. An example of such a truck 15 shown in Figure 1. In the meaning of industrial trucks, trucks that are material handlers are referred to. It has a load handling section and a drive section. The load handling section usually has a stand, but can also be without a stand. The load handling portion includes a pair of forks. Usually there are two forks but the pair of forks in should be interpreted as one or more forks.
    The pair of forks can be raised and lowered to handle loads. The raising and lowering function is performed with the help of hydraulic pistons 4, 40, 400. The pair of forks is usually mounted on a fork-lift truck, but can also be designed so that a fork-lift truck is not needed, for example on a low-lift industrial truck. If the trolley is available, it is connected to a hydraulic piston for lifting. In some industrial trucks, the pair of forks can be pushed sideways. To push the fork pair sideways, there are hydraulic pistons 4, 40, 400.
    In some industrial trucks 15, the width of the fork pair can optionally also be adjusted. in those cases it is also done with hydraulic coives, or hydraulic pistons. On some industrial trucks, the load handling section itself includes a driver's basket.
    The driver's basket can then be moved vertically with the forks. The load handling part itself may also have a function for displacement in its entirety. Preferably, this movement takes place with the aid of hydraulic pistons 4, 40, 400. Usually this movement takes place horizontally. In a variant of industrial trucks, the fork pair can also be rotated in a substantially horizontal direction.
    The drive section contains functions for propelling the truck. The drive section contains an energy source. The energy source is preferably a battery, but can also be of another kind, such as petrol, diesel, gas or the like. 10 '15 20 25 16 The drive section contains at least one drive motor. The drive motor is connected to one or more of the truck's hui. Usually there is a grow | between drive motor and drive wheel.
    The drive motor is usually an electric motor.
    The drive section usually includes control means for operating the truck. These can consist of a hinge arm, a steering wheel, and the like. There are also means for maneuvering the load section, these can consist of means for lifting, lowering and tilting the forks, there can also be means for changing the fork spread. The bodies can be levers, knob knobs, or the like. They can be individual for each function or several functions are gathered in the same body. For larger trucks, a driver's seat can be arranged in the E drive section. For smaller industrial trucks, such as articulated forklifts, the driver walks with the truck or rides on a platform behind the truck.
    When the industrial truck moves, the drive section works.
    The drive section also usually contains the hydraulic pump 10, as exemplified above in connection with fi gur 3.
    For some industrial trucks, the load handling section and drive section consist of a combined unit. The industrial truck usually contains a truck computer. The truck computer includes processor, frame and space memory. The truck computer has an overall ability to control other electronic components in the truck. The truck computer is hierarchically at the top of the truck in terms of electronics and can be likened to a brain. It has the ability to store software and can execute it. According to what has been mentioned above, the truck computer is centered and may comprise the said control unit 12.
    权利要求:
    Claims (1)
    [1]
    A method for cleaning hydraulic fluid in an industrial truck (15) with a hydraulic system (1) comprising, a hydraulic pump (10), a hydraulic tank (11), and return line to the hydraulic tank (11) with a return filter (3), the method comprising the steps of: a. the hydraulic pump (10) is activated for hydraulic activity b. the hydraulic pump 10 pumps the hydraulic fluid for the hydraulic activity and in connection with this return flow takes place through the return filter (3) to the hydraulic tank (11). , c. the hydraulic pump (10) can be activated by means included in the industrial truck (15), when hydraulic activity is not present, in order thereby to create a circulation to the hydraulic tank (11) through the return filter (3) so that sufficient filtration of the hydraulic fluid is achieved. Method according to claim 1, wherein the industrial truck (15) is arranged to automatically determine that the cleaning of the hydraulic fluid during hydraulic activity is not sufficient. Method according to claim 2, wherein the industrial truck (15) is arranged to perform the following steps: d. Accumulation of a time Ta for hydraulic activity e. Determining that Ta has reached a predetermined value and based on this the industrial truck automatically determines that the hydraulic fluid is not sufficiently cleaned, of return via the return filter (3) during hydraulic activity. Method according to any one of claims 1 - 3, wherein the Endustritrucken (15) is arranged to perform the following steps automatically when the hydraulic fluid is not sufficiently cleaned: f. Activating the hydraulic pump (10) for circulation without hydraulic activity, through the return filter (3 ), for cleaning the hydraulic fluid. g. noilställ Ta. Method according to any one of claims 1 - 4, wherein the industrial truck (15) is arranged to accumulate a time Tb for accumulated circulation time, without hydraulic activity, and that sufficient cleaning is automatically determined by the industrial truck (15) led step as follows: h. Sufficient purity has been achieved when the industrial truck (15) reaches a predetermined value of accumulated Tb. Method according to claim 5, wherein the industrial truck (15) is arranged to perform the following steps when sufficient purity has been achieved: i. Zero tb j. End circulation without hydraulic activity. Method according to claim 2, wherein the industrial truck (15) is arranged to perform the following steps, with a sensor arranged in the industrial truck (15) for measuring the quality of the hydraulic fluid: k. Measuring the quality of the hydraulic fluid l. Determining that a first predetermined condition for the hydraulic fluid quality is filled, based on which it is automatically determined that the hydraulic fluid is not sufficiently cleaned, by reflux via the reflux filter (3) during hydraulic activity, thereby activating the hydraulic pump (10) for circulation without hydraulic activity. A method according to claim 7, wherein the industrial truck (15) is arranged to perform the following steps: automatically determining that sufficient purity has been achieved, during circulation without hydraulic activity, based on a predetermined other conditions for the quality of the hydraulic fluid are met. Method according to claim 8, wherein the industrial truck (15) is arranged to (perform the following steps when said other conditions for the quality of the hydraulic fluid are met: n. End circulation with the hydraulic pump (10) without hydraulic activity. Method according to any one of claims 7 - 9, wherein said The method according to any one of the preceding claims, wherein the industrial truck (15) is arranged to allow circulation only without hydraulic activity, if the industrial truck (15) is arranged to measure the particle content of the hydraulic fluid, and the first and / or second predetermined condition for the quality of the hydraulic fluid. Computer software product comprising computer-readable code which, when the control unit (12) of an industrial truck (15) causes the industrial truck (15) to perform the method according to any one of claims 1 to 11, it is executed in the control unit (12) of an industrial truck (15) characterized in that it comprises the computer program product according to claim 12. Control unit (12) according to claim 13, characterized in that it make your own unit outside a centers! truck computer. 15. Control unit (12) according to claim 13, characterized in that it is integrated in a central truck computer. Industrial truck (15) characterized by it is arranged to be able to perform the method according to any one of claims 1 - 11 by means of a computer program product according to claim 12 and a control unit (12) according to any one of claims 13 - 1. characterized in that the industrial truck (15) is arranged so that activation of the hydraulic pump (10) for circulation without hydraulic activity can take place manually. Industrial truck (15) according to one of Claims 16 or 17, characterized in that the industrial truck (15) comprises a means, preferably on the control panel of the industrial truck, for activating the hydraulic pump (10) for circulation without hydraulic activity. Industrial truck (15) according to any one of claims 16 - 18, wherein the industrial truck (15), after manual activation, is arranged to continue with circulation without hydraulic activity, until! until it receives a manual deactivation command. Industrial truck according to one of Claims 16 to 19, in which the industrial truck (15) comprises a sensor for measuring the quality of the hydraulic fluid. An industrial truck (15) according to claim 20, wherein said sensor is a particle content meter.
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    同族专利:
    公开号 | 公开日
    SE535284C2|2012-06-12|
    EP2347991B1|2013-04-17|
    EP2347991A1|2011-07-27|
    US8968573B2|2015-03-03|
    US20110180486A1|2011-07-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    申请号 | 申请日 | 专利标题
    SE1050076A|SE535284C2|2010-01-25|2010-01-25|Method for cleaning hydraulic fluid, computer program product, control unit and industrial truck|SE1050076A| SE535284C2|2010-01-25|2010-01-25|Method for cleaning hydraulic fluid, computer program product, control unit and industrial truck|
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    US13/011,095| US8968573B2|2010-01-25|2011-01-21|Method for cleaning hydraulic liquid, computerprogram product, control unit, and industrial truck|
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