• 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:
    The invention relates to a method and position sensor assembly for determining a mutual position between a first object and a second object. The position sensor assembly comprises a first body, a coil, a control unit, and a sensor circuit, said first body being reciprocally displaceable in the axial direction in relation to said coil. The sensor circuit comprises in turn a comparator connected to a first branch comprising said coil, a power switch, and a measuring resistance coupled in series with each other.
    公开号:SE1250721A1
    申请号:SE1250721
    申请日:2012-06-28
    公开日:2013-12-29
    发明作者:Anders Hoeglund
    申请人:Cargine Engineering Ab；
    IPC主号:
    专利说明:

    In addition, there will be requirements that the systems used must be robust and show great reliability at minimal cost. In recent years, systems have emerged which comprise a stationary coil / inductor which cooperates with a movable body made of an electrically conductive material, said movable body being connected to the valve and moving continuously therewith.
    See, for example, US 7,032,549, a ionization sensor assembly comprising an oscillator which describes a position of a first body, a coil, a control unit and a sensor circuit, said first body being reciprocally axially displaceable relative to and external to said coil.
    The sensor circuit in turn comprises a comparator connected to a first branch comprising said coil, an oscillator and a measuring resistor connected in series with each other. The coil when energized is arranged to generate an oscillating magnetic field which in turn induces eddy currents in the displaceable body, which causes the coil to be short-circuited.
    The degree of short circuit of the coil changes in proportion to the change of the mutual overlap between the coil and the body. The comparator then determines the position of the valve based on the phase shift between the supply voltage of the oscillator and the voltage across the measuring resistor, whereby the phase shift increases with increasing overlap between the coil and the body.
    However, this positioning sensor assembly has the disadvantage that it comprises one or similar signal generator which, in relative terms, provides an oscillator, holds an alternating voltage signal, is energy-intensive when the oscillator is continuously in operation.
    Furthermore, this method includes partly analog signals, which means that the mutual position can only be determined with a relatively low time and position resolution. Brief Description of the Objects of the Invention The present invention aims to obviate the above-mentioned disadvantages and shortcomings of prior art positioning sensor assemblies and to provide an improved method and positioning sensor assembly for determining a mutual position between a first object and a second object. A basic object of the invention is to provide an improved method and positioning sensor assembly of initially defined type, whereby determination of the mutual position can be carried out with high precision and at the same time low energy consumption.
    A further object of the present invention is to provide a method which allows selectable distance between mutually isolated determinations of the mutual position.
    It is another object of the present invention to provide a positioning sensor assembly which is fully digitized, which provides a simple and inexpensive solution which still enables the determination of the mutual position with high precision.
    It is another object of the present invention to provide a positioning sensor assembly which is robust and non-contact.
    It is a further object of the present invention to provide a positioning sensor assembly which comprises few and inexpensive components.
    Brief description of the features of the invention According to the invention, at least the basic object is achieved by means of the initially defined method and the positioning sensor assembly, which have the features defined in the independent claims. Preferred embodiments of the present invention are further defined in the dependent claims. According to a first aspect of the present invention, there is provided a method of initially defined type, which comprises the steps of: sending an uplink of a digital input signal pulse from the control unit to the switch to effect a state change of the switch from open to closed, detecting a first state change of an output signal from the comparator, and determining a relative position between said first body and said coil based on the delay between the uplink of the input signal pulse and the first state change of the output signal, or comprising the steps of: a digital input signal pulse from the control unit to the switch to effect a state change of the switch from open to closed, detect a first state change of the output signal from the comparator, detect a second state change of said output signal, and determine a relative position between said first body and said coil based on the delay between the first state change of the output signal and the second state change of the output signal.
    According to a second aspect of the present invention there is provided a positioning sensor assembly, the sensor circuit comprising: a first branch comprising said coil, a measuring resistor, and a switch having an input operatively connected to said control unit for receiving individual digital input signal pulses, and a comparator which is connected to said first branch via a first input for obtaining an instantaneous measuring voltage across the measuring resistor, and which further comprises a second input for obtaining an instantaneous reference voltage, and an output operatively connected to said control unit for outputting individual state changes. Of a digital output signal based on the mutual relationship between said measuring voltage and said reference voltage.
    Thus, the present invention is based on the insight that by using individual digital input pulse pulses and individual digital output pulse pulses obtained therefrom, the possibility of determining the mutual position between a first object and a second object with high time and position resolution and low energy consumption is obtained. .
    According to a preferred embodiment of the present invention, said first state change of the output signal from the comparator is an up edge of a digital output signal pulse, and wherein said second state change of the output signal from the comparator is a down edge of said digital output signal pulse.
    According to a preferred embodiment, the sensor circuit of the positioning sensor assembly comprises a feedback branch connected between the output of the comparator and the second input of the comparator. Which means that when the state change of the output signal from the comparator changes, the determination of the mutual position is simplified as a result of the state change being secured and multiple rapid state changes caused by electrical noise, etc., are eliminated.
    Preferably, the first body of the positioning sensor assembly is axially displaceable within the coil.
    Which means that a more powerful inductance change and thus a better relationship between signal and noise can be achieved with a coil with a given inductance at a given driving power.
    Additional advantages and features of the invention will be apparent from the other dependent claims and from the following detailed description of preferred embodiments. Brief Description of the Drawings A more complete understanding of the above and other features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which: FIG. is a schematic cross-sectional view of a valve connected to a positioning sensor assembly according to the invention, with the valve in the closed position, Fig. 2 is a schematic cross-sectional view of the valve in Fig. 1, with the valve in the open position, Fig. 3 is a schematic view of a sensor circuit according to a first embodiment, Fig. 4 is a schematic representation of a sensor circuit according to a second embodiment, Fig. 5 is a schematic representation of a sensor circuit according to a third embodiment, Fig. 6 is a schematic representation of a sensor circuit according to a fourth embodiment, Fig. 7 is a schematic view of a sensor circuit according to a fifth embodiment, and Fig. 8 is a schematic view of a sensor orc circuit according to a sixth embodiment.
    Detailed Description of Preferred Embodiments Reference is made initially to Figures 1 and 2, which show an example of an application embodying the present invention. The present invention relates generally to a method and positioning sensor assembly for determining a relative position between a first object 1 and a second object 2.
    In the application shown in Figures 1 and 2, said first object consists of a valve 1 and said second object of a The valve seat 2, which are arranged in an internal combustion engine. The present invention will now be described in connection with the determination of the relative position between a valve 1 and a valve seat 2 without being limited thereto. The valve 1 is reciprocally displaceable in the axial direction between a closed position, figure 1, and an open position, figure 2. It should be pointed out that the valve 1 can be both an inlet valve and an outlet valve in one of the cylinders of the internal combustion engine.
    The valve 1 has a valve stem 3 and a valve plate 4. The valve stem 3 extends through and is controlled by a valve stem seal 5 and the valve plate 4 is arranged to cooperate with said valve seat 2 to alternately allow and prevent passage of gas, respectively. The valve stem seal 5 is arranged in a through hole in a stationary part 6 of the internal combustion engine. The valve 1 is preferably displaceable by means of a pneumatic and / or hydraulic actuator (not shown), which acts on an upper end 7 of the valve stem 3 of the valve 1 to displace the valve 1 from its closed position to its open position.
    Furthermore, the internal combustion engine preferably comprises a conventional, schematically shown, valve spring 8, which is arranged to return the valve 1 from its open position to its closed position. The valve spring 8 acts at its lower end directly or indirectly against the stationary part 6 of the internal combustion engine, and at its upper end against a carrier 9, or valve spring washer, which is connected to the valve stem 3 in the region of its upper end 7.
    A positioning sensor assembly is arranged to determine the mutual position between the valve 1 and the valve seat 2, i.e. determine where the valve 1 is located and to what extent the valve opening of the valve seat 2 is open, or in other words the actual valve lift.
    Reference is now also made to Figure 3, which shows a schematic representation of a sensor circuit according to a first embodiment. The positioning sensor assembly comprises a first body 10 connectable to said valve 1, a coil or inductor 11 connectable to said valve seat 2, a control unit (not shown) designated 12.
    The first body 10 consists of an electrically conductive and a sensor circuit, generally body, preferably made of a non-magnetic metal such as aluminum. However, it is conceivable that said first body 10 is made of a magnetic metal, such as a compressed iron powder body. It should be pointed out that the first body 10 is preferably connected to the carrier 9, or that the carrier 9 forms part of said first body 10. Said first body 10 is displaceable back and forth in axial direction relative to said coil 11, and preferably said first body 10 is displaceable in axial direction, secondly the first body 10 is constituted by a pipe segment which has radially inside the coil 11. In the embodiment shown an outer diameter of 25 millimeters and which is concentrically arranged relative to the valve stem 3, wherein the valve spring 8 is arranged radially inside said first body 10.
    In the embodiment shown, the coil 11 is arranged in a seat 13 of a sleeve 14 which is connected to the stationary part 6 of the internal combustion engine. The sleeve 14, the seat 13 and the spool 11 are preferably concentrically arranged relative to the valve stem 3. The spool 11 is preferably made of copper and comprises, for example, 44 windings with an inner diameter of 28 millimeters.
    The sensor circuit 12 comprises a first branch and a comparator 15. The first branch of the sensor circuit 12 comprises said coil 11, a switch 16 with an input 17 operatively connected to said control unit for input of individual digital input signal pulses and a measuring resistor 18, the coil 11, the switch 16 and the measuring resistors 18 are connected in series with each other. Furthermore, said first branch is connected between a voltage source 19 and ground, which voltage source 19 is preferably approximately +5 volts. It should be pointed out that said coil may consist of two series- of which a first coil belongs to a first provided connected coils, valve and a second coil belongs to a second valve, that the first valve and the second valve do not have overlapping valve lift curves.
    The comparator 15 of the sensor circuit 12 is connected to said first branch via a first input 20 to obtain an instantaneous measuring voltage across the measuring resistor 18, and comprises a second input 21 for obtaining an instantaneous reference voltage and an output 22 operatively connected to said output control unit. of individual state changes of a digital output signal.
    The comparator 15 is arranged to obtain and compare instantaneous measuring voltage across the measuring resistor 18 and instantaneous reference voltage, and is arranged to generate a state change of the digital output signal based on the mutual relationship between the measuring voltage and the reference voltage. A state change of the digital output signal from the output 22 of the comparator 15 is generated when the measuring voltage and the reference voltage change relative magnitude, i.e. changes mutual order regarding which value is greatest between them.
    The positioning sensor assembly works as follows. When the valve 1 is displaced relative to the valve seat 2 to let in or out gas from the cylinder of the internal combustion engine, the first body 10 is also displaced relative to the coil 11. As the overlap between the first body 10 and the coil 11 increases, the time required decreases. for the measuring voltage to change a predetermined result due to the coil 11 being short-circuited to varying degrees of influence from the first body value in proportion thereto, 10. According to a preferred embodiment, the change consumption time is approximately 5.5 microseconds at 0 millimeter overlap, approximately 4, 0 microseconds at 5 millimeters of overlap, and approximately 2.8 microseconds at 10 millimeters of overlap. The measuring voltage across the measuring resistor 18 changes when the voltage across the coil 11 changes, the voltage across the coil 11 changes as a result of a state change of the switch 16 from open to closed.
    Within the framework of the common inventive concept of the present invention, said change access time can be determined according to two methods, which methods make a corresponding contribution to prior art, but which are realizations of the same basic idea which are not suitable to be defined unanimously.
    The method according to the invention comprises according to the first method the steps of, sending an uplink, or positive edge, of a digital input signal pulse from the control unit to the switch 16 to effect a state change of the switch 16 from open to closed, detecting a first state change of the output signal from the comparator 15, and determining a relative position between said first body 10 and said coil 11 based on the time delay between the up edge of the input signal pulse and the first state change of the output signal.
    According to the second method, the method according to the invention comprises the steps of sending an uplink of a digital input signal pulse from the control unit to the switch 16 to effect a state change of the switch 16 from open to closed, detecting a first state detecting one and determining a change of the output signal. from the comparator 15, second state change of said output signal, a relative position between said first body 10 and said coil 11 based on the time delay between the first state change of the output signal and the second state change of the output signal.
    The above-mentioned first method is based on a sensor circuit structure where there is a time delay between the edge of the input signal pulse and the first state change of the output signal. The above-mentioned second method is based instead on a sensor circuit structure in which the flank of the input signal pulse and the first state change of the output signal take place simultaneously. Preferably, said first state change of the output signal from the comparator 15 is an up edge of a digital output signal pulse, said second state change of the output signal from the comparator 15 being a down edge of said digital output signal pulse.
    According to a preferred embodiment, the above-mentioned first method also comprises the step of, based on the detection of said first state change of the output signal from the comparator 15, sending a down edge, or negative edge, of said digital input signal pulse from the control unit to the switch 16 to effect a state change of switch 16 from closed to open. According to a preferred embodiment, the above-mentioned second method also comprises the step of, based on the detection of said second state change of the output signal from the comparator 15, sending a down edge of said digital input signal pulse from the control unit to the switch 16 to effect a state change of the switch 16 from closed to open. In other words, the duration of the digital input pulse should be kept as short as possible to save energy.
    A great advantage of the present invention is that determination of the mutual position between the valve 1 and the valve seat 2 can be chosen to be done only when there is, ie. when the valve 1 is in motion. The movement of the valve 1 is based on a purpose of determining the relative position, the crankshaft movement of the internal combustion engine, and is in a normal internal combustion engine in motion for about 1/2 revolution of one rotational revolution of the crankshaft. During the time the valve 1 is in motion, the position of the valve 1 is preferably determined once per crank angle degree, ie. approximately 180 times during one revolution of the crankshaft.
    Hereinafter, a number of realizations of the sensor circuit 12 of the positioning sensor assembly will be described, all of which have in common that the sensor circuit 12 comprises a second branch which is connected between the voltage source 19 and ground, and which comprises a first reference circuit. 12 resistor 23 and a second reference resistor 24, which are connected in series with each other, the second input 21 of the comparator 15 being connected to said second branch at a point located between said first reference resistor 23 and said second reference resistor 24. Furthermore, the first input of the comparator 15 is Connected to said first branch at a point located between said measuring resistor 18 and the coil 11.
    In order to operate according to the above-mentioned first method, the sensor circuit 12 can be realized, for example, in accordance with Figure 4 which shows a schematic representation of the sensor circuit 12 according to a second embodiment, or in accordance with Figure 5 which shows a schematic representation of the sensor circuit 12 according to a third embodiment. Common to these embodiments is that the coil 11 is located between the voltage source 19 and the point on the first branch which is connected to the first input 20 of the comparator 15. It should be noted that the position of the switch 16 relative to the coil 11 and the measuring resistor 18 is freely selectable. In the third embodiment shown in Figure 5, the sensor circuit 12, in addition to that shown in the second embodiment according to Figure 4, comprises a feedback branch 25, or amplification branch, connected between the output 22 of the comparator 15 and the second input 21 of the comparator 15, to secure the state change. of the output signal of the comparator 15 to eliminate multiple rapid state changes caused by electrical noise, etc.
    In order to function according to the above-mentioned second method, the sensor circuit 12 can for instance be realized in accordance with Figure 6 which shows a schematic representation of the sensor circuit 12 according to a fourth embodiment, or in accordance with Figure 7 which shows a schematic representation of the sensor circuit 12 according to a fifth embodiment. Common to these embodiments is that the measuring resistor 18 is located between the voltage source 19 and the point on the first branch which is connected to the first input 20 of the comparator 15. It should be noted that the position of the switch 16 relative to the coil 11 and the measuring resistor 18 is freely selectable. In the fourth embodiment 13 shown in Fig. 6, in addition to that shown in the fifth embodiment according to Fig. 7, the sensor circuit 12 comprises a feedback branch 25, or amplification branch, connected between the output 22 of the comparator 15 and the 15 second entrance 21.
    Figure 8 shows a schematic representation of the sensor circuit 12 according to a sixth embodiment, which sensor circuit is realized to function according to the above-mentioned second method. In this embodiment, the sensor circuit comprises a feedback branch 25, or gain branch, connected between the output 22 of the comparator 15 and the first input 20 of the comparator 15, and the measuring resistor 18 is located between the voltage source 19 and the point on the first branch connected to the comparator 15. first input 20. Furthermore, the switch 16 is arranged adjacent ground, and that the sensor circuit 12 comprises a synchronizing resistor 26 which is connected in parallel across the switch 16, the first branch and second branch of the sensor circuit 12 being each connected in series with both the synchronizing resistor 26 and the switch 16.
    Possible modifications of the invention The invention is not limited only to the embodiments described above and shown in the drawings, which have only illustrative and exemplary purposes. This patent application is intended to cover all adaptations and variants of the preferred embodiments described herein, and accordingly, the present invention is defined by the wording of the appended claims and the same equivalents, thus within the scope of the appended claims. ter. the equipment can be modified in any conceivable It should also be pointed out that all information about / concerning should be interpreted / read with the equipment oriented in accordance with terms such as above, below, upper, lower, etc., the figures, with the drawings oriented in such a way that the reference numerals can be read correctly.
    Thus, such terms only indicate to each other which conditions can be changed if the equipment according to the invention is provided with a conditions in the embodiments shown, different construction / design.
    It should be pointed out that even if it is not explicitly stated that features from a specific design can be combined with the features in another design, this should be considered obvious when possible.
    权利要求:
    Claims (11)
    [1]
    A method of determining a mutual position between a (10) (11) sensing sensor assembly, which comprises said first body (10), (11), a control unit and a sensor circuit (12), said first body (10) axially displaceable relative to said coil (11), (15) connected to a first branch comprising said coil (10) and a measuring resistor (18) series with each other, (15) obtaining and comparing an instantaneous measuring voltage across the measuring resistor (18) arranged that based on the mutual relationship between the first body and a coil by means of a position-mentioned coil is back and forth the sensor circuit (12) comprises a comparator (11), a switch connected in which the comparator is arranged to and an instantaneous reference voltage , and the measuring voltage and the reference voltage generate a state change of a digital output signal, the method comprising the steps of: - sending an uplink of a digital input signal pulse from the control (16) state change of the switch to accessing one (16) unit of the switch from open to closed, - detecting a first state change of the output signal from the comparator (15), and - determining a relative position between said first body (10) and said coil (11) based on the time delay between the up edge of the input pulse and the first state change of the output signal, or comprises the steps of: - sending an up edge of a digital input signal pulse from the control (16) state change of the switch to cause one (16) unit of the switch from open to closed, - detecting a first state change of the output signal from the comparator (15), detecting a second state change of said output signal, and - determining a relative position between said first (10) (11) relationship between the first state change of the output signal and the body and said coil based on the second state change of the time delay signal.
    [2]
    A method according to claim 1, of the output signal from the comparator wherein said first state change (15) is an edge of one and wherein said second state (15) digital output pulse, change of the output signal from the comparator is a down edge of said digital output pulse.
    [3]
    A method according to claim 1 or 2, to: - send an uplink of a digital input signal pulse from the control (16) state change of the switch wherein the method in addition to the steps of providing one (16) unit to the switch from open to closed, - detecting a first state change of the output signal from the comparator (15), and - determining a relative position between said first body (10) and said coil (II) based on the time delay between the uplink of the input signal pulse and the first state change of the output signal, also comprising the step of: the detection of said first state (15), down edge of said digital input signal pulse from control (16) state change of the switch change of the output signal from the comparator send one to cause one (16) unit to the switch from closed to open.
    [4]
    A method according to claim 1 or 2, wherein: the method in addition to the steps of sending a digital input signal pulse from the control (16) state change of the switch to provide one (16) unit to the switch from open to closed, - detecting a first state change of the output signal from (15), - detecting a second state change of said output signal, the comparator and - determining a relative position between said first (10) (11) relationship between the first state change of the output signal and the body and said coil based on the second state change of the time delay output signal, also comprises the step of: - based on the detection of said second state end (15), edge of said digital input signal pulse from the control unit (16) changing the switch ring of the output signal from the comparator sending a down to provide a state (16) to the switch from closed to open.
    [5]
    Positioning sensor assembly for determining and which positioning sensor assembly comprises a mutual position between a first object (1), second object (2), comprises: (10) (11) a control unit and a sensor circuit a first body connectable to said first object (1) , (2), first body (10) connectable to said second object (12), is reciprocally displaceable in axial (11), a coil, said joint relative to said coil (12) a first branch comprising said coil (12) Said control unit for receiving individual digital (18), and the measuring resistor sensor circuit comprises: (11), with an input operatively connected to a switch, the coil (18) being input signal pulses and a measuring resistor (11), (16) connected in series with each other, the switch 10 15 20 25 30 35 18 which is connected to said first (20) instantaneous measuring voltage across the measuring resistor (15), branches via a first input a comparator to obtain a (18), (21) and a and which further comprises a second input for obtaining an instantaneous reference voltage, output (22) operatively connected to said control unit for outputting individual state changes of a digital output signal based on the mutual relationship between said measuring voltage and said reference voltage.
    [6]
    A positioning sensor assembly according to claim 5, wherein the sensor circuit (12) comprises a feedback branch (25) connected between the output (22) of the comparator (15) and the second input (21) of the comparator (15).
    [7]
    A positioning sensor assembly according to claim 5 or 6, wherein the first branch of the sensor circuit (12) is connected between a voltage source (19) and ground, and wherein the sensor circuit (12) comprises a second branch which is connected between the voltage source (19) and ground. , and comprising a first (24), wherein the reference resistor of the comparator and a second reference resistor (23) which are connected in series with each other, (15) (21) are located at a point between said first reference resistor (23) (24). second input connected to said second branch and said second reference resistor
    [8]
    Positioning sensor assembly according to claim 7, wherein the switch (16) is arranged adjacent ground.
    [9]
    Positioning sensor assembly according to claim 8, wherein (12) which are connected in parallel across the switch (12) are each connected in series with both the synchronizing (26) (16). comprises a synchronizing resistor (16), first branch and second branch the sensor circuit (26), the resistance of the sensor circuit as the switch 19
    [10]
    A positioning sensor assembly according to any one of claims 5-9, wherein said first body (10) is constituted by an electrically conductive body, preferably made of aluminum.
    [11]
    A positioning sensor assembly according to any one of claims 5-10, wherein said first body (10) is axially displaceable within the coil (II).
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    同族专利:
    公开号 | 公开日
    US20150247718A1|2015-09-03|
    SE536617C2|2014-04-01|
    JP2015522159A|2015-08-03|
    KR20150036250A|2015-04-07|
    US9778014B2|2017-10-03|
    CN104487664A|2015-04-01|
    JP6159399B2|2017-07-05|
    EP2867483A1|2015-05-06|
    EP2867483A4|2016-05-11|
    WO2014003650A1|2014-01-03|
    CN104487664B|2017-10-17|
    RU2015102599A|2016-08-20|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1250721A|SE536617C2|2012-06-28|2012-06-28|Method and positioning sensor composition for determining a mutual position between a first object and another object|SE1250721A| SE536617C2|2012-06-28|2012-06-28|Method and positioning sensor composition for determining a mutual position between a first object and another object|
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    KR20157002370A| KR20150036250A|2012-06-28|2013-06-25|Method and position sensor assembly for determining a mutual position between a first object and a second object|
    JP2015520120A| JP6159399B2|2012-06-28|2013-06-25|Method and position sensor assembly for determining mutual position between a first object and a second object|
    US14/408,622| US9778014B2|2012-06-28|2013-06-25|Method and position sensor assembly for determining a mutual position between a first object and a second object|
    RU2015102599A| RU2630631C2|2012-06-28|2013-06-25|Method and unit of position sensor for determining relative position between the first object and the second object|
    EP13809643.3A| EP2867483A4|2012-06-28|2013-06-25|Method and position sensor assembly for determining a mutual position between a first object and a second object|
    BR112014032817A| BR112014032817A2|2012-06-28|2013-06-25|position sensor method and assembly for determining a mutual position between a first object and a second object|
    PCT/SE2013/050765| WO2014003650A1|2012-06-28|2013-06-25|Method and position sensor assembly for determining a mutual position between a first object and a second object|
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