• 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:
    A combustion engine (120) in a vehicle is started by means of an electric starter motor (110) which is diagnosed via measuring means (130, 140), a temperature measurement means (150) and a processor (160). The measuring means (130, 140) are configured to measure technical magnitudes related to the vehicle but representing only a supply voltage (U) to the starter motor and a rotation speed (RPM) of the engine (120). The temperature measurement means (150) is configured to measure at least one temperature (T) related to the vehicle. The processor (160) is configured to determine for the starter motor (110) a status indicator (S) which serves as a measure of the quality of the starter motor's performance. The status indicator (S) is based on the measured technical magnitudes and the at least one temperature (T) related to the vehicle.
    公开号:SE1250086A1
    申请号:SE1250086
    申请日:2012-02-07
    公开日:2013-08-08
    发明作者:Holger Dreher；Gunnar Ledfelt
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    15 20 25 30 and the speed gives insufficient precision in assessing the function of the starter motor, at least under certain circumstances.
    SUMMARY OF THE INVENTION The object of the present invention is therefore to provide a solution which alleviates the above problems and thus enables a more reliable diagnosis of an electric starter motor present in a motor vehicle.
    According to one aspect of the invention, the object is achieved by the system initially described, the system comprising a temperature measuring means configured to measure at least one temperature related to the vehicle. The processor is here configured to determine the status indicator on a wider basis of the at least one measured temperature.
    This system is advantageous, as environmental changes (for example due to seasonal changes and / or geographical conditions) are weighed into the diagnostic method in a natural and adequate way. The viscosity of the oil in the internal combustion engine varies considerably with the temperature, which in turn is reflected in the measured speed.
    According to an embodiment of this aspect of the invention, the processor is configured to assign the status indicator a first value if the function of the starter motor is considered acceptable, and a second value if the starter motor is not considered to function satisfactorily. Specifically, the status indicator is assigned the first value if the measured supply voltage exceeds a voltage threshold and the measured speed exceeds a speed threshold. That is, a properly functioning starter motor is expected to result in at least a certain engine speed of the internal combustion engine when the starter motor is supplied with a certain supply voltage.
    According to another embodiment of this aspect of the invention, the processor is configured to additionally apply an adaptive side condition based on the at least one measured temperature so that at a relatively high measured temperature a relatively low measured supply voltage must correspond to of a measured speed exceeding the speed threshold for the adaptive additional condition to be considered fulfilled, and the status indicator is consequently assigned the first value. At a relatively low measured temperature, on the other hand, a relatively high measured supply voltage can correspond to a measured speed just above the speed threshold, whereby the adaptive secondary condition is considered to be fulfilled and the status indicator is assigned the first value. Thus, relevant consideration is given to the effect of temperature on the starter motor's conditions for functioning. The adaptive side condition is advantageously inversely proportional to the measured temperature.
    According to yet another embodiment of this aspect of the invention, the processor is configured to assign the status indicator a third value representing that the function of the starter motor cannot be determined if the measured supply voltage falls below the voltage threshold. If the supply voltage is too low, no conclusion can be drawn as to whether the fact that the internal combustion engine does not start depends on whether the starter motor is faulty, or if the fault is due to something else, such as insufficient battery voltage.
    According to a further embodiment of this aspect of the invention, the measuring means are configured to measure the technical quantities during a measuring range, and the processor is configured to average the measured technical quantities over the measuring range. The processor is also configured to determine the status indicator on the basis of an average value of the supply voltage to the starter motor during the measuring interval and an average value of the speed of the internal combustion engine during the measuring interval. Advantageously, the temperature measuring means is also configured to measure the at least one temperature during a measuring interval and the processor is configured to average the measured temperature over the measuring interval. The processor is configured here to utilize the averaged temperature in determining the status indicator. Such consideration of average values is advantageous, since the instantaneous values for supply voltage, speed and temperature can be temporarily misleading for the actual conditions. It may also be advantageous to consider other parameters, such as a minimum measured supply voltage to the starter motor during a compression cycle.
    According to a further embodiment of this aspect of the invention, it is assumed that the internal combustion engine can be of a certain engine type of at least two different possible engine types. The processor is here configured to determine the status indicator on a further basis of the engine type in the vehicle. The different engine types are assumed to be associated with different conditions for the starter motor's function, and based on the information on the current engine type, appropriate parameters and threshold values can thus be selected for diagnosing the starter motor.
    According to another aspect of the invention, the object is achieved by the method initially described, in which at least one temperature related to the vehicle is measured, and the status indicator is determined on a further basis by the at least one measured temperature. The advantages of this method, as well as of the preferred embodiments thereof, are apparent from the discussion above with reference to the proposed system.
    According to a further aspect of the invention, the object is achieved through a computer program directly downloadable to the internal memory of a computer, comprising software for controlling the steps according to the method proposed above when said program is run on a computer. The computer can in turn be represented by a control unit in the vehicle, a diagnostic unit connected thereto, a tablet, a smartphone, etc.
    According to another aspect of the invention, the object is achieved by a computer-readable medium with a program stored thereon, the program being adapted to cause a computer to control the steps according to the method proposed above. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be explained in more detail by means of embodiments, which are described by way of example, and with reference to the accompanying drawings.
    Figure 1 shows a schematic view of a proposed system, Figures 2a-b show graphs illustrating how the status indicator can be assigned according to embodiments of the invention, and Figure 3 shows a flow chart illustrating the general method according to the invention.
    DESCRIPTION OF EMBODIMENTS OF THE INVENTION We first refer to Figure 1 which shows a schematic view of a system according to the invention for diagnosing an electric starter 110. The electric starter 110 is assumed to be included in a vehicle equipped with an internal combustion engine 120, where the electric motor 120 110 is configured to start the internal combustion engine 120. The electric starter motor 110 is in turn powered by a battery 135.
    The proposed system includes measuring means 130 and 140, temperature measuring means 150 and a processor 160.
    The measuring means 130 and 140 are configured to measure technical quantities related to the vehicle. The technical quantities represent exclusively a supply voltage U to the starter motor 110 and a RPM speed of the internal combustion engine 120, respectively. In the following description, the RPM speed of the internal combustion engine 120 is discussed throughout. When the starter motor 110 and the internal combustion engine 120 are connected (e.g. via a so-called
    Bendix coupling) there is of course a relationship between the speed of the internal combustion engine 120 and the speed of the starter motor 110, so a measured speed of the starter motor 110 can be used as well as the proposed speed RPM of the internal combustion engine 120 Temperature measuring means 150 is configured to measure at least one temperature T related to the vehicle. The at least one temperature T can for instance refer to an ambient temperature at the vehicle, an oil temperature in the engine, a cooling water temperature, an engine block temperature, a starter engine temperature and / or a battery temperature. It is advantageous to register more than one temperature, as this allows an assessment of whether the vehicle is cold started (all temperatures are essentially the same), warm started (oil temperature in the engine and a cooling water temperature significantly exceeds the ambient temperature), or started in a semi-hot state (the cooling water temperature significantly exceeds the ambient temperature, but the oil temperature in the engine is relatively low).
    The processor 160 is configured to, based on the measured technical quantities U and RPM and the temperature T, determine a status indicator S for the starter motor 110, which status indicator S indicates a quality measure of the performance of the starter motor 110.
    For increased reliability / robustness, the measuring means 130 and 140, according to an embodiment of the invention, are configured to measure the technical quantities during a measuring interval, say 1 second during which measuring interval, for example, 10 individual measurements are registered.
    Alternatively, the measurement range may be adaptively coupled to one or more compression cycles of the internal combustion engine 120, so that the measurement range represents an integer number of compression cycles.
    A typical compression cycle is about 15 ms long. As an alternative to a pure averaging RPM, the processor 160 in such a case may be configured to record a minimum speed during a compression cycle. Starting performance has been shown to depend on the speed when it is at its lowest.
    Further, the processor 160 may be configured to average between a respective lowest measured supply voltage U to the starter motor 110 in each of a number of compression cycles.
    The processor 160 can thus be configured to average the measured technical quantities over the measuring range and determine the status indicator S on the basis of an average value of the supply voltage Uavg to the starter motor 110 during the measuring interval and an average value of the RPMaVg speed of the internal combustion engine 120.
    Correspondingly, the temperature measuring means 150 is suitably configured to measure at least one temperature T during a measuring interval. If so, of course, the processor 160 is configured to average the at least one measured temperature T over the measurement range, and utilize at least one of the at least one averaged temperature in determining the status indicator S.
    It may further be advantageous to adapt the diagnostic method performed by the processor 160 depending on seasonal changes. For example, a temperature adjustment can be made in two steps (summer / winter), in several steps (such as below -25 ° C, between -25 ° C and -20 ° C, between -20 ° C and -10 ° C , between -10 ° C and 10 ° C, between 10 ° C and 10 ° C, and above 10 ° C), or continuously on the basis of a defined ratio, for example: RPMeXp = U> <P1 / (T + P2), where RPMeXp indicates the expected speed, U indicates measured supply voltage to the starter motor 110, T indicates a measured temperature and P1 and P2 are adaptation parameters.
    Figure 2a shows a first graph illustrating how the status indicator S is assigned according to an embodiment of the invention. The graph shows an average supply voltage Uavg to the starter motor 110 along the horizontal axis and an average RPMavg of the internal combustion engine 120 along the vertical axis.
    According to this embodiment of the invention, the processor 160 is configured to assign the status indicator S a first value OK if the function of the starter 110 is considered acceptable, and a second value NOT if the starter 110 is not considered to function satisfactorily. 10 15 20 25 30 The status indicator S is assigned the first value OK if the measured supply voltage Uavg exceeds a voltage threshold Um and the measured speed simultaneously exceeds a speed threshold RPMth.
    It is advantageous to calculate the status indicator S continuously by comparing a measured RPM with an expected speed and applying at least a threshold level (for example a first level representing an acceptable starter motor function OK and a second level corresponding to an unacceptable starter motor function NOT) for example according to the ratio below: 0. .ÉÉ.'§ {', I.N1. (I2. U / N2 (T) where RPM indicates a measured speed at a start attempt, T indicates a measured temperature (such as an ambient temperature at the vehicle), U indicates a measured supply voltage at the start attempt, N1 (T) indicates a speed offset at temperature T, and N2 (T) indicates a speed parameter at temperature T.
    In the above condition, the status indicator becomes S = 80 if the starter motor function is good. S 2 70 can thus correspond to an acceptable starter motor function OK. If, on the other hand, S <70, the starter motor function is considered unacceptable NOT, so a replacement of the starter motor should be recommended.
    In addition, it is advantageous if the processor 160 applies an adaptive side condition which is dependent on the at least one measured temperature T. This may mean that, at a first temperature T1, the speed must exceed the speed threshold RPMÜ, in relation to how much the supply voltage Uavg exceeds a first control voltage Um, where Um 2 Um. The adaptive bi-condition is advantageously inversely proportional to the at least one measured temperature T.
    To illustrate this, we refer to Figure 2b, where a second graph shows how the processor 160 assigns the status indicator S. Similar to Figure 2a. the graph here shows an average supply voltage Uavg to the starter motor 110 along the horizontal axis and an average RPMavg of the internal combustion engine 120 along the vertical axis.
    In Figure 2b, a measured temperature T is assumed to have a value T2> T1.
    The fact that the adaptive auxiliary condition is inversely proportional to the measured temperature T means that, at a higher temperature T, for a given supply voltage Uavg a higher speed RPMaVg is required for the function of the starter motor 110 to be considered acceptable (and the status indicator S to be assigned it first value OK). The temperature-dependent secondary condition according to the graph in Figure 2b therefore has a steeper slope than in Figure 2a.
    In order to further tighten the speed requirement at an increased temperature T, a second control voltage Um, at a higher temperature T2> T1, can also be given a lower value, i.e. Um <Um, where the Ubrz 2 Uth processor 160 is thus advantageously configured to apply the adaptive auxiliary condition on the basis of the measured temperature T so that, at a relatively high measured temperature T2, a relatively low measured supply voltage Uavg must correspond to a measured speed exceeding the speed threshold RPMth in order for the adaptive auxiliary condition to be considered fulfilled the first value OK.
    At a relatively low measured temperature T2, on the other hand, the processor 160 is advantageously configured to assign the status indicator S, so that a relatively high measured supply voltage Uavg can correspond to a measured speed just above the speed threshold RPMth, the adaptive auxiliary condition being considered satisfied and the status indicator S assigned the first value OK.
    If the measured supply voltage Uavg is below the voltage threshold Um, it is, as mentioned above, impossible to determine the function of the starter motor. According to an embodiment of the invention, therefore, in such a case, the processor 160 is configured to assign a status value UNDEF to the status indicator S, representing that the function of the starter motor cannot be determined. the vehicle can be of a certain engine type of at least two different possible engine types. The different engine types are in turn assumed to be associated with different conditions for the function of the starter motor 110. Typically, different types of internal combustion engines have different starter motors. This in turn requires a parameter adjustment. For example, stroke volume and cylinder number may require such an adjustment. Information regarding the current type of internal combustion engine 120 may be stored in the vehicle, or obtained interactively via data entered by a mechanic. In any case, the processor 160 according to this embodiment is configured to determine the status indicator S on a further basis of the engine type in the vehicle. Namely, based on the information about the current engine type, the processor 160 can employ adapted parameters and threshold values to diagnose the starter motor 110 in an adequate manner.
    The processor 160 is suitably controlled to operate as above by means of a computer program stored in a memory unit M, which is included in the processor 160 or is communicatively connected thereto.
    For the purpose of summarizing, the general method according to the invention will now be described with reference to the flow chart in fi gur3.
    In a first step 310, a starter motor is assumed to be activated. Prior to that, the fuel injection to the internal combustion engine has been switched off, so that the internal combustion engine does not risk starting during the diagnostic procedure. The starter motor is otherwise assumed to be in a vehicle and to be arranged to start an internal combustion engine which is also present in the vehicle.
    A subsequent step 320 registers a first technical quantity related to the vehicle in the form of a measured speed of the internal combustion engine. As described above, the speed is suitably recorded during a measurement interval, which may be synchronized with one or more compression cycles. A step 330, parallel to step 320, registers a second technical quantity related to the vehicle in the form of a supply voltage to the starter motor. A step 340, parallel to steps 320 and 330, registers at least one temperature related to the vehicle, i.e. a non-technical quantity.
    Based on the measured technical quantities and the minimum temperature, a step 350 then determines a status indicator for the starter motor. The status indicator indicates a quality measure of the starter's performance, for example whether the starter motor is working satisfactorily or not.
    The method steps described with reference to Figure 3 can be controlled by means of a programmed computer apparatus. In addition, although the embodiments of the invention described above with reference to the figures include a computer and processes performed in a computer, the invention extends to computer programs, especially computer programs on or in a carrier adapted to practically implement the invention. The program may be in the form of source code, object code, a code which is an intermediate between source and object code, such as in partially compiled form, or in any other form suitable for use in implementing the process according to the invention. The carrier can be any entity or device which is capable of carrying the program. For example, the carrier may comprise a storage medium such as a flash memory, a Read Only Memory (ROM), for example a CD (Compact Disc) or a semiconductor ROM, EPROM (Electrically Programmable ROM), EEPROM (Erasable EPROM ), or a magnetic recording medium, such as a floppy disk or hard disk. In addition, the carrier may be a transmitting carrier such as an electrical or optical signal, which may be conducted through an electrical or optical cable or via radio or otherwise. When the program is formed by a signal which can be conducted directly by a cable or other device or means, the carrier can be constituted by such a cable, device or means. Alternatively, the carrier 12 may be an integrated circuit in which the program is embedded, where the integrated circuit is adapted to perform, or to be used in performing, the actual processes.
    The invention is not limited to the embodiments described with reference to the figures but can be varied freely within the scope of the appended claims.
    权利要求:
    Claims (18)
    [1]
    A system for diagnosing an electric starter motor (110) in a vehicle equipped with an internal combustion engine (120), the internal combustion engine (120) for which the electric starter motor (110) is configured to start, the system comprising: measuring means (130, 140). ) configured to measure technical quantities related to the vehicle, which technical quantities exclusively represent a supply voltage (U) to the starter motor and a speed (RPM) of the internal combustion engine, and a processor (160) configured to determine based on the measured technical quantities a status indicator (S) for the starter motor (110), which status indicator (S) indicates a quality measure of the performance of the starter motor (110), characterized in that the system comprises temperature measuring means (150) configured to measure at least one temperature (T) related to the vehicle, and the processor (160) is configured to determine the status indicator (S) on a further basis of the at least one measured temperature (T).
    [2]
    The system of claim 1, wherein the processor (160) is configured to: assign the status indicator (S) a first value (OK) if the function of the starter motor (110) is considered acceptable, and a second value (NOT) if the starter motor is not considered to work satisfactorily, the status indicator (S) being assigned the first value (OK) if the measured supply voltage (Uavg) exceeds a voltage threshold (Um) and the measured speed exceeds a speed threshold (RPMth).
    [3]
    The system of claim 2, wherein the processor (160) is configured to further apply an adaptive adverse event based on the at least one measured temperature (T) so that: at a relatively high measured ambient temperature (T2), a relatively low measured supply voltage (Uavg) must correspond to a measured speed exceeding the speed threshold 10 15 20 25 30 14 (RPMth) for the adaptive secondary condition to be considered fulfilled and the status indicator (S) is assigned the first value (OK), and at a relatively low measured temperature (T2), a relatively high measured supply voltage (Uavg) can correspond to a measured speed just above the speed threshold (RPMm) whereby the adaptive secondary condition is considered to be fulfilled and the status indicator (S) is assigned the first value (OK).
    [4]
    The system of claim 3, wherein the adaptive adverse condition is inversely proportional to the at least one measured temperature (T).
    [5]
    The system according to any one of claims 2 to 4, wherein if the measured supply voltage (Uavg) is below the voltage threshold (Um), the processor is configured to assign the status indicator (S) a third value (UNDEF) representing that the starter motor function cannot determined.
    [6]
    The system of any preceding claim, wherein the measuring means (130, 140) is configured to measure the technical quantities during a measuring range, and the processor (160) is configured to: average the measured technical quantities over the measuring range and determine the status indicator (S ) on the basis of an average value of the supply voltage (Uavg) to the starter motor (110) during the measuring interval and an average value of the speed (RPMaVg) of the internal combustion engine during the measuring interval.
    [7]
    The system of claim 6, wherein: the temperature measuring means (150) is configured to measure the at least one temperature (T) during the measuring range, and the processor (160) is configured to average at least one of the at least one measured temperature (T) above measuring interval, and utilizing said at least one of the at least one averaged temperature in determining the status indicator (S).
    [8]
    The system of any preceding claim, wherein the internal combustion engine (120) is assumed to be of a particular engine type of at least two different possible engine types, and the processor (160) is configured to determine the status indicator (S) on a further basis of the engine type in the vehicle. .
    [9]
    A method of diagnosing an in-vehicle electric starter motor (110), the method comprising: measuring technical quantities related to the vehicle, which technical quantities exclusively represent a supply voltage (U) to the starter motor and a speed (RPM ) of the internal combustion engine, and determining a status indicator (S) for the starter motor (110) based on the measured technical quantities, the status indicator (S) indicating a quality measure of the performance of the starter motor (110), characterized by: measuring at least one temperature (T) related to the vehicle, and determining the status indicator (S) on a further basis of the at least one measured temperature (T).
    [10]
    The method of claim 9, wherein the status indicator (S) is capable of assuming a first value (OK) representing that the operation of the starter motor (110) is acceptable, and a second value (NOT) representing that the starter motor (110) is not operating satisfactorily, and the method includes: assigning the status indicator (S) the first value (OK) if the supply voltage (Uavg) exceeds a voltage threshold (Um) and the speed (RPMaVg) exceeds a speed threshold (RPMm).
    [11]
    The method of claim 10, comprising applying an adaptive adverse condition based on the at least one measured temperature (T) such that: at a relatively high measured temperature (T2), a relatively low measured temperature (T2) measured supply voltage (Uavg) must correspond to a measured speed exceeding the speed threshold (RPMth) for the adaptive secondary condition to be considered fulfilled and the status indicator (S) is assigned the first value (OK), and at a relatively low measured temperature (T2) , a relatively high measured supply voltage (Uavg) can correspond to a measured speed just above the speed threshold (RPMth) whereby the adaptive secondary condition is considered to be fulfilled and the status indicator (S) is assigned the first value (OK).
    [12]
    The method of claim 11, wherein a fulfillment of the adaptive adverse condition is inversely proportional to the at least one measured temperature (T).
    [13]
    The method according to any one of claims 10 to 12, comprising assigning the status indicator (S) a third value (UNDEF) if the supply voltage is below the voltage threshold (Um). wherein the third value (UNDEF) represents that the function of the starter motor cannot be determined.
    [14]
    The method according to any one of claims 9 to 13, comprising: measuring the technical quantities during a measuring interval, averaging of said respective technical quantity (U; RPM) over the measuring range, and utilizing the averaged technical quantities (Uavg; RPMavg) when determining the status indicator (S).
    [15]
    The method of claim 14, comprising: measuring the at least one temperature (T) during the measuring range, averaging at least one of the at least one temperature (T) over the measuring range, and utilizing said at least one of the averaging temperature (T ) when determining the status indicator (S). 10 17
    [16]
    The method according to any one of claims 9 to 15, wherein the starter motor (110) is configured to start an internal combustion engine (120) present in the vehicle, which internal combustion engine (120) is assumed to be of a certain engine type of at least two different possible engine types, me. the tod comprising: determining the status indicator (S) on a wider basis the engine type in the vehicle.
    [17]
    A computer program directly downloadable to the internal memory (M) of a computer, comprising software for controlling the steps according to any one of claims 9 to 16 when said program is run on the computer.
    [18]
    A computer readable medium (M) having a program stored thereon, the program being adapted to cause a computer to control the steps of any of claims 9 to 16.
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    同族专利:
    公开号 | 公开日
    SE536801C2|2014-09-02|
    EP2812564A4|2017-10-25|
    EP2812564A1|2014-12-17|
    WO2013119168A1|2013-08-15|
    引用文献:
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    DE102006039112A1|2006-08-21|2008-02-28|Robert Bosch Gmbh|Method for determining the speed of a starter|
    US8234036B2|2008-06-16|2012-07-31|GM Global Technology Operations LLC|Method and apparatus for starter motor diagnosis and prognosis using parameter estimation algorithm|
    DE102008047630B4|2008-09-17|2015-09-03|Continental Automotive Gmbh|Method and device for detecting a faulty starter device in a vehicle|
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    法律状态:
    2021-09-28| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1250086A|SE536801C2|2012-02-07|2012-02-07|Diagnostics of starter motor|SE1250086A| SE536801C2|2012-02-07|2012-02-07|Diagnostics of starter motor|
    EP13746140.6A| EP2812564A4|2012-02-07|2013-01-22|Diagnosis of starter motor|
    PCT/SE2013/050046| WO2013119168A1|2012-02-07|2013-01-22|Diagnosis of starter motor|
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