JP2006317334A - Solenoid abnormality detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid abnormality detection device for detecting abnormality of inductance of a solenoid. <P>SOLUTION: The solenoid abnormality detection device comprises the solenoid driven by a solenoid drive circuit, a current monitor means for monitoring current made to flow through the solenoid; a current judgment means for judging whether the current is stable on the basis of a change ratio of the current, and an inductance abnormality detection means for detecting the abnormality of the inductance of the solenoid on the basis of a comparison result of a stable time until the current is stable and a reference stable time of the current made to flow through the solenoid set previously. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solenoid abnormality detection device that detects an abnormality of L of an element having an L / R component.

  When diagnosis detection is performed on an element having L and R components such as a solenoid, failure detection is performed on the R component.

  For example, a solenoid is driven by a solenoid drive circuit, a voltage value supplied to the driven solenoid and a current value flowing through the driven solenoid are monitored, and the solenoid voltage is determined based on the monitored voltage value and current value. A resistance value is obtained and abnormality of the solenoid is detected (for example, refer to Patent Document 1).

In this case, an abnormality of the solenoid is detected based on a comparison between the obtained resistance value of the solenoid and a preset reference resistance value of the solenoid.
JP 2004-347446 A

  However, the background art described above has the following problems.

  There is a problem that an abnormality in the solenoid resistance value can be detected, but an abnormality in the inductance cannot be detected.

  In addition, since an abnormal value of L is not detected, the actuator may not be prevented from malfunctioning or malfunctioning.

  In addition, since the circuit through which the current flows is already incorporated in the ECU, the current value cannot be changed. For this reason, even if the L component changes, an optimal current value cannot be supplied, and even if the same current as before is supplied, the device does not operate. In addition, there is a possibility of operating with less current than has been used so far.

  Therefore, the present invention is to solve such a problem, and a main object of the present invention is to provide a solenoid abnormality detection device capable of detecting abnormality of solenoid inductance.

  In order to achieve the above object, the solenoid abnormality detection device of the present invention includes a solenoid driven by a solenoid drive circuit, current monitoring means for monitoring a current flowing through the solenoid, and the current based on the rate of change of the current. Current determination means for determining whether the current is stable, a stabilization time until the current is stabilized, and a comparison result of a preset reference stabilization time of the current flowing through the solenoid, the inductance of the solenoid One of the features is that it includes an inductance abnormality detecting means for detecting abnormality.

  With this configuration, it is possible to detect an abnormality in the solenoid inductance based on the time until the current of the solenoid coil is stabilized.

  In another solenoid abnormality detection device of the present invention, a solenoid driven by a solenoid drive circuit, a voltage monitoring means for monitoring a voltage supplied to the solenoid, a voltage at a preset detection time, and the detection One of the features is that it comprises an inductance abnormality detecting means for detecting an abnormality in the inductance of the solenoid based on a comparison result with a preset reference voltage in time.

  With this configuration, it is possible to detect an abnormality in inductance based on a voltage value at a predetermined time.

  According to the embodiment of the present invention, it is possible to provide a solenoid abnormality detecting device capable of detecting an abnormality in solenoid inductance.

Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings.
In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

  A solenoid abnormality detection apparatus according to a first embodiment of the present invention will be described with reference to FIG.

  The solenoid abnormality detection device 100 according to the present embodiment includes a solenoid 102 as an actuator, a solenoid drive unit 104 connected to one terminal of the solenoid 102, and a power supply path supplied from a voltage source of the solenoid drive unit 104. Connected voltage monitor unit 106, current monitor unit 108 connected to the other terminal of solenoid 102, solenoid drive unit 104, current monitor unit connected to voltage monitor unit 106 and current monitor unit 108, inductance abnormality detection And a control unit 110 as a resistance value calculation means.

  The solenoid drive unit 104 includes, for example, a voltage source and a constant current source, receives power from the voltage source, supplies current to the solenoid 102 based on a drive control signal provided from the control unit 110, and causes the solenoid 102 to operate. To drive. The solenoid driving unit 104 supplies current to the solenoid 102 from a constant current source.

  The voltage monitor unit 106 monitors the voltage of the power supply path. The voltage monitor unit 106 inputs the monitored voltage value to the control unit 110.

  The current monitor unit 108 monitors the current flowing through the solenoid 102. The current monitor unit 108 includes, for example, a shunt resistor connected between the other terminal of the solenoid 102 and the ground, and a current output from the other terminal of the solenoid 102 is allowed to flow through the shunt resistor, thereby The output current is converted into a voltage, and the voltage obtained by this conversion is input to the control unit 110.

  The control unit 110 calculates the output current of the solenoid 102 by computing the voltage input from the current monitoring unit 108. In addition, the control unit 110 calculates an output current at a predetermined cycle, and obtains a current change rate from the calculated current value. In addition, the control unit 110 determines that the current is stable when the calculated change rate of the current becomes smaller than a predetermined change rate. In addition, the control unit 110 obtains the time until it is determined that the current is stable. For example, the control unit 110 obtains the time from when the current is supplied to the solenoid 102 until it is determined that the current is stable. Control unit 110 compares the time until it is determined that the current is stable and a preset reference stabilization time of the solenoid, and detects an abnormality of the solenoid based on the comparison result.

  Thus, by detecting the time until the current of the solenoid 102 is stabilized, the abnormality of the solenoid can be detected, and the malfunction of the actuator and the delay of the operation due to the abnormality of the inductance can be prevented.

  In addition, the control unit 110 obtains a resistance value based on the calculated output current value and the input voltage value. Further, the control unit 110 obtains the inductance from the calculated resistance value and the time until the current is determined to be stable, and based on the comparison result between the obtained inductance and a preset reference inductance, Detect solenoid abnormality.

  Thus, by calculating the inductance of the solenoid coil based on the stabilization time and the resistance value, it is possible to directly obtain the inductance, and to detect abnormality of the solenoid inductance based on the obtained inductance.

  Next, the operation of the solenoid abnormality detection device 100 according to the present embodiment will be described with reference to FIG.

  First, it is detected whether there is an abnormality such as short / open (step S202).

  If an abnormality such as a short / open is detected (step S202: NO), the process ends with another abnormality, that is, an abnormality other than the inductance of the solenoid 102 (step S204).

On the other hand, when there is no abnormality such as a short circuit open (Step S202: YES), the solenoid driver 104 applies a current _{i 1} or voltages _{V 1} to the solenoid 102 (step S206). Here, the current i ₁ is a minute current that does not affect the solenoid 102, and the voltage V ₁ is a minute voltage that does not affect the solenoid 102.

  Next, the control unit 110 performs an arithmetic process on the voltage value input from the voltage monitor unit 106 and the voltage value input from the current monitor unit 108, and thereby based on the calculated output current value of the solenoid 102. A resistance value R of 102 is calculated (step S208).

  Next, the control unit 110 determines whether or not the calculated resistance value R falls within a range from Ra, which is a normal range of the resistance value R, to Rb, that is, whether Ra <R <Rb. Step S210).

  If the calculated resistance value R is not Ra <R <Rb (step S210: NO), the process ends with another abnormality, that is, an abnormality other than the inductance of the solenoid 102 (step S204).

On the other hand, when the calculated resistance value R is Ra <R <Rb (step S210: YES), the solenoid driver 104 applies a current _{i 2} to the solenoid 102 (step S212). Here, the current i ₂ is a minute current that does not affect the solenoid 102, and is, for example, a current that is larger than the current applied when the resistance value R is measured.

  Next, the control unit 110 calculates the output current of the solenoid 102 by computing the voltage value input from the current monitoring unit 108. Further, the control unit 110 calculates a current change rate based on the output current value measured at a predetermined cycle, and when the calculated current change rate becomes smaller than the predetermined change rate, Is determined to be stable. Control unit 110 measures time T until it is determined that the current is stable (step S214).

  Next, the control unit 110 determines whether or not the time T until the current is determined to be stable falls within the range of the current reference stabilization time Ta, which is the normal range of T, to Tb, that is, Ta <T <Tb. It is determined whether or not (step S216).

  If the time T until it is determined that the current is stable is Ta <T <Tb (step S216: YES), the solenoid reactance is normal, and the process ends.

  On the other hand, when the time T until it is determined that the current is stable is not Ta <T <Tb (step S216: NO), it is determined that the reactance of the solenoid is faulty (step S218).

  Next, the control unit 110 determines whether or not the drive current for the solenoid drive unit 104 is variable (step S220).

  When the drive current is variable (step 220: YES), the control unit 110 calculates an optimum current value for driving the L component, and sends a drive control signal for setting the calculated current value to the solenoid drive unit. 104 is input. As a result, the solenoid drive unit 104 changes the current value based on the input drive control signal.

  On the other hand, when the drive current is not variable (step 220: NO), the control unit 110 notifies that the L component is abnormal.

  In this embodiment, the time T until it is determined that the current is stable is based on whether or not the normal time range of T is in the range of Ta to Tb, that is, whether Ta <T <Tb. In the above, the case where it is determined whether or not the L portion is abnormal has been described. However, the value for the L portion is calculated, and the determination is made based on whether or not the calculated value for the L portion is within the specified range. Also good. For example, the time T until the current is determined to be stable is calculated by the equation (1).

T = R / L (1)
Here, R is the resistance of the solenoid 102, and L is the inductance of the solenoid 102.

  The time T until the current is determined to be stable is shorter as L is larger, and is longer as L is smaller.

  Using the resistance value R calculated in step S208 and the time T until the current determined in step S214 is determined to be stable, L is calculated according to equation (1). It is determined whether or not the calculated inductance L falls within the range of Lmax from the reference inductance Lmin of the solenoid that is the normal range of L, that is, whether or not Lmin <L <Lmax. In this case, it is determined that the calculated L is normal when Lmin <L <Lmax, and is abnormal when Lmin <L <Lmax is not satisfied.

  Next, a solenoid abnormality detecting apparatus according to a second embodiment of the present invention will be described.

  The configuration of the solenoid abnormality detection device according to this embodiment is the same as that of the solenoid abnormality detection device described with reference to FIG.

  The control unit 110 of the solenoid abnormality detection device 100 according to the present embodiment monitors the output current value of the solenoid 102 and the voltage value input from the voltage monitoring unit 106, and after a monitoring current is supplied, a predetermined detection time is obtained. The voltage after the lapse is detected, and an abnormality in the inductance of the solenoid 102 is detected based on a comparison result between a voltage value at a preset detection time and a preset reference voltage at the detection time.

  By detecting the voltage at a predetermined time in this way, an abnormality in inductance can be detected. In addition, since the number of operations can be reduced as compared with the first embodiment, the processing load can be reduced.

  Next, the operation of the solenoid abnormality detection device 100 according to the present embodiment will be described with reference to FIG.

  First, it is detected whether there is any abnormality such as short / open (step S302).

  If an abnormality such as a short / open is detected (step S302: NO), the process ends with another abnormality, that is, an abnormality other than the inductance of the solenoid 102 (step S304).

On the other hand, when there is no abnormality such as short / open (step S302: YES), the control unit 110 does not apply a special current / voltage to the solenoid 102, and the potential V of the solenoid 102 input by the voltage monitoring unit 106. ₀ is measured (step S306).

Next, the solenoid drive unit 104 applies the current i ₁ to the solenoid 102 (step S308). Here, the current i ₁ is a minute current that does not affect the solenoid 102.

Next, the control unit 110 refers to the voltage monitoring unit 106 measures the output potential _{V i} after elapse of a predetermined time tau (step S310). Here, the predetermined time τ is a time before the output voltage is completely stabilized as shown in FIG.

Next, whether or not the difference between the potential V ₀ and the output potential V _i after elapse of τ, that is, V _i −V ₀ falls within the range of the reference voltage Vmin, which is the normal range of V _i −V ₀ , Vmax, That is, it is determined whether or not Vmin <V _i −V ₀ <Vmax (step S312).

If V _i −V ₀ is Vmin <V _i −V ₀ <Vmax (step S312: YES), the reactance of the solenoid 102 is assumed to be normal, and the process ends.

On the other hand, when V _i −V ₀ is not Vmin <V _i −V ₀ <Vmax (step S312: NO), it is notified that the reactance of the solenoid is faulty (step S314).

  In this way, an abnormality in inductance can be detected based on the voltage at a predetermined time.

  The solenoid abnormality detection apparatus according to the embodiment of the present invention can be applied to an apparatus for detecting abnormality for L of an element having an L / R component.

It is a block diagram which shows the solenoid abnormality detection apparatus concerning one Example of this invention. It is a flowchart which shows operation | movement of the solenoid abnormality detection apparatus concerning one Example of this invention. It is a flowchart which shows operation | movement of the solenoid abnormality detection apparatus concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the solenoid abnormality detection apparatus concerning one Example of this invention.

Explanation of symbols

100 Solenoid abnormality detection device 102 Solenoid

Claims (3)

A solenoid driven by a solenoid drive circuit;
Current monitoring means for monitoring the current flowing through the solenoid;
Current determining means for determining whether the current is stable based on a rate of change of the current;
Inductance abnormality detection means for detecting an abnormality in the inductance of the solenoid based on a comparison result between a stabilization time until the current is stabilized and a reference stabilization time of a current flowing through the solenoid set in advance. Solenoid abnormality detection device. In the solenoid abnormality detection device according to claim 1,
Voltage monitoring means for monitoring the voltage supplied to the solenoid;
A resistance value calculating means for obtaining a resistance value of the solenoid based on a voltage supplied to the solenoid and a current flowing through the solenoid;
With
The inductance abnormality detecting means obtains an inductance from the current stabilization time and the resistance value of the solenoid, and detects an abnormality in the inductance of the solenoid based on a comparison result between the inductance and a preset reference inductance of the solenoid. A solenoid abnormality detection device characterized by that. A solenoid driven by a solenoid drive circuit;
Voltage monitoring means for monitoring the voltage supplied to the solenoid;
Solenoid abnormality characterized by comprising: an inductance abnormality detecting means for detecting abnormality of inductance of the solenoid based on a comparison result between a voltage at a preset detection time and a preset reference voltage at the detection time. Detection device.

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