KR100212587B1 - Order discrimination device of operator - Google Patents

Abstract

Thereby obtaining an actuator failure determination device capable of determining short-circuit failure as well as open-circuit failure of the actuator.

A device for determining the failure of the actuator (3), which is provided at an output terminal of a drive circuit (12) for driving the actuator (3) A reference current value generating circuit 14 for generating a reference current value IR corresponding to the drive current in the steady state of the actuator 3; And a failure judgment means (11) for judging a failure of the actuator (3) on the basis of a comparison circuit (15) comparing the current value IR with the comparison result E of the comparison circuit (15) Is determined.

Description

Actuator failure determination device

FIG. 1 is a configuration diagram showing a first embodiment of the present invention as a functional block. FIG.

FIG. 2 is a flowchart showing an operation according to a second embodiment of the present invention; FIG.

FIG. 3 is a timing chart for explaining the operation of the third embodiment of the present invention. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

1: ECU 2: Battery

3: Actuator 11: CPU

12: power transistor 13: current detection section

14: reference current value generating circuit 15: comparison circuit

CT1, CT2: Timer counter D: Drive signal

E: Comparison result FF: Fault determination flag

ID: Drive current IR: Reference current value

Id: current detection value J: determination result

T1: output cycle T2: predetermined time

TDa: Forced tune value TDb: Normal duty value

SI03, SI04: step driven with forced duty value

S105, S106: Step of judging the elapse of a predetermined time

S107: Step of setting a failure determination flag

S108: Step of judging the presence / absence of failure

[Object of the invention]

[TECHNICAL FIELD OF THE INVENTION AND RELATED ART OF THE SAME]

The present invention relates to an actuator failure determination device for determining the presence or absence of a failure, for example, of an electromagnetic actuator mounted on an engine, and more particularly to an actuator failure determination device capable of determining a short failure as well as a breakage failure.

An actuator failure determination device that determines the presence or absence of a failure in an actuator that is conventionally duty-driven at a predetermined cycle is described in, for example, Japanese Patent Application Publication No. 3-1498.

In this case, when the engine is emptied, the actuator is forcibly energized and the potential of the collector of the emitter ground power transistor serving as the output terminal of the drive circuit is detected. If the detected voltage indicates the grounding evel, If the level is not indicated, it is determined that the breakage of the actuator has occurred.

However, when a short-circuit fault occurs at one end of the actuator, the detected voltage indicates the ground level as in the normal state, so that the actuator is erroneously determined to be in a normal state and the occurrence of a fault state can not be determined.

[Problem to be solved by the invention]

Since the conventional actuator failure determination device detects the voltage of the output terminal of the drive circuit as described above, the detection voltage at the time of short circuit failure of the actuator becomes the ground level, so that it can not distinguish between a short- There is a problem in that this high failure judgment can not be realized.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an apparatus for judging an actuator failure capable of judging a short circuit failure as well as a breakage of an actuator.

[MEANS FOR SOLVING THE PROBLEMS]

According to the present invention, there is provided an apparatus for judging a failure of an actuator provided on an output terminal of a drive circuit for driving an actuator, comprising: a current detector for detecting a drive current flowing through the actuator via a drive circuit; A reference current value generation circuit for generating a reference current value corresponding to a drive current in a steady state of the actuator, a comparison circuit for comparing the current detection value in the current detection section with a reference current value, And a duty calculating means for calculating a duty value of a drive current, wherein the duty calculating means calculates a duty value of a drive current at the time of a failure determination by a predetermined value or more .

The actuator failure determination device according to claim 3 of the present invention is characterized in that the actuator includes a reactance component and the failure determination means determines a comparison result of the comparison circuit after a predetermined time has elapsed since the drive current was supplied .

[Example]

[Example 1]

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing Embodiment 1 of the present invention, and shows a case where a control device such as an electronic actuator of an automotive engine has a failure determination function.

1, the ECU 1 constitutes an actuator control device and an actuator failure determination device, and operates as a power supply to the battery 2 of a vehicle.

The actuator 3 inserted between the ECU 1 and the battery 2 is constituted by a solenoid or the like including a reactance component and is driven under the control of the ECU 1 and supplied with the drive current ID from the battery 2 .

Since the diode 4 connected in parallel to the actuator 3 flows a current immediately after the cutoff of the drive current ID, the polarity of the diode 4 is opposite to that of the battery 2.

The ECU 1 that performs various computation and determination processing includes a CPU 11 that outputs a drive signal D for driving and controlling the actuator 3 and for determining a failure, A memory means (not shown) is provided, and various sensor signal lamps (not shown) indicating the operating state of the engine are inputted.

The ECU 1 further includes a power transistor 12 of an emitter ground whose drive signal D is applied to the base and is controlled to be turned on and off and a current transformer 12 disposed at a collector terminal of the power transistor 12 and detecting a drive current ID A reference current value generating circuit 14 for generating a reference current value IR corresponding to the drive current in the steady state of the actuator 3; And a comparison circuit 15 for comparing the reference current Id with the reference current value IR.

The drive signal D has a duty cycle of a predetermined period and the drive current ID has a duty value corresponding to the drive signal D and periodically flows through the collector and the emitter of the power transistor 12. [

The comparison result E of the comparison circuit 15 is inputted to the CPU 11 and is used for determining the failure of the actuator 3 (to be described later).

The power transistor 12 constitutes a driving circuit in cooperation with the CPU 11, and the collector of the power transistor 12 serves as an output terminal of the driving circuit.

The current detection unit 13, the reference current value generation circuit 14 and the comparison circuit 15 constitute a failure determination device of the actuator 3 in cooperation with the CPU 11.

The CPU 11 includes duty calculation means for calculating a duty value of the drive current ID and forcibly sets the duty value of the drive current ID at the time of the determination of the failure of the actuator to a predetermined value or more.

The CPU 11 also includes failure determination means for determining whether or not a failure has occurred in the actuator 3 on the basis of the comparison result E of the comparison circuit 15, Failure determination time), the failure determination is made with reference to the comparison result (E).

2 is a flowchart showing the operation of the actuator driving control (including the failure determination processing) by the CPU 11 and is repeatedly executed at predetermined intervals (for example, about 1 msec). Fig. 3 is a timing chart showing operation signals in the ECU 1. Fig.

In each figure, the timer counter CT1 determines the duty update period of the drive signal D, that is, the output period T1, and the timer counter CT2 determines a predetermined period of time T2 at which the failure determination flag FF is set Time).

The duty value for the output period T1 of the drive signal D is set to the forced duty value TDa (= T1 x a / 100) at the time of the failure determination and is set to the normal duty value TDb (= T1 x b / 100) .

However, the relationship between the calculation values a and b for determining the respective durations TDa and TDb is a≥b.

The current detection value Id of the driving signal D by the forced duty value TDa is compared with the reference current value IR (e.g., several 10mA to 100mA), and the comparison result E of the current detection value Id of the driving signal D and the reference current value IR Is referred to after the elapse of a predetermined time (T2) at which the timer counter (CT2) becomes zero. In response to the comparison result E, the failure determination flag FF is set and the determination result J (normal or failure) is set according to the comparison result E. [

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described with reference to FIG. 2 and FIG. 3.

In this case, it is assumed that the actuator 3 to be subjected to drive control and failure determination is an electronic solenoid mounted on an automotive engine. The failure determination flag FF is cleared to " 0 " in the ON operation of the starter key, and the timer counter CT1 and the timer counter CT2 are initially set to values corresponding to the output cycle T1 and the predetermined time T2, respectively .

In FIG. 2, first, the value of the timer counter CT1 is subtracted by "1" (step S100), and it is judged whether or not the failure judgment flag FF is set (step S101).

If it is determined that the failure determination flag FF is not set (i.e., NO), the failure determination processing of the actuator 3 is in the state before the completion of the failure, and the following failure determination processing (steps S102-S110) is executed.

In the initial state, since the failure determination flag FF is cleared to " 0 ", the failure determination processing is immediately executed.

First, it is judged whether or not the timer counter CT2 is a value corresponding to the predetermined time T2 (step S102). If it is judged that ((CT2 = T2 (that is, YES)), the process proceeds to the next step S103 .

In the initial state, since the timer counter CT2 is set to the value corresponding to the predetermined time T2, it is determined as YES in step S102, and the process proceeds to the next step S103.

That is, the duty value of the drive signal D is set to the forced duty value TDa (= T1 x a / 100) for determining the failure (step S103), and the power transistor 12 is turned on and the drive current ID is passed, And drives the actuator 3 with the value TDa (step S104).

At this time, the calculated value a of the forced duty value TDa is set to about 80%, for example, and the forced duty value TDa is usually set to the duty value TDb (the calculated value b is, for example, before and after 30% Lt; / RTI >

On the other hand, the reference current value generating circuit 14 generates a reference current value IR which is slightly smaller than the drive current ID after the elapse of the predetermined time T2 at the normal time of the actuator 3, Input to the reference terminal.

The current detection value Id of the drive current ID input to the comparison terminal of the comparison circuit 15 is equal to the reference current value IR after elapse of the predetermined time T2 even though the actuator 3 includes the reactance component. The comparison result E outputted from the comparison circuit 15 can be reliably raised to the H level (see FIG. 3).

Thus, after the actuator driving step S104 is executed, it is judged whether or not the failure determination time (predetermined time T2) has been reached or not, that the count value of the timer counter CT2 has reached 0 (step S105) .

If it is determined that CT2> 0 (that is, NO), the value of the timer counter CT2 is subtracted by 1 (step S106), the processing routine of FIG. 2 is exited, and CT2 = The decreasing step (S106) is repeated until it is judged as 0 (i.e., YES).

In the initial state, since the timer counter CT2 is set to the value corresponding to the predetermined time T2, the decreasing step S106 is executed. Once the decreasing step S106 is passed, then CT2> T2 (i.e., NO), so that steps S103 and S104 are skipped.

Therefore, once the actuator driving step S105 has been executed, the process proceeds from step S102 to step S105, and the reduction step S106 is repeatedly executed.

When it is determined in step S105 that CT2 = 0 (that is, YES), a failure determination flag FF is set (step S107), and it is determined whether or not the comparison result E input from the comparison circuit 15 is at the H level (Step S108).

At this time, if the comparison result E is determined as H level (YES), the determination result J is set to the " steady state " (step S109). If it is determined to be the L (Step S110) and exits from the processing routine of FIG. 2 (step S110).

On the other hand, if it is determined in step S101 that the failure determination flag FF is set (i.e., YES), it is determined whether the determination result J is normal or not (step S111). Once the failure determination flag FF is set, the failure determination process is not performed thereafter.

If it is determined that the determination result J is normal (i.e., YES), the normal drive process (steps S112 to S115) for the actuator 3 is executed as follows.

First, it is determined whether or not the duty cycle updating time of the driving signal D is reached (step S112) by determining whether the timer counter CT1 for setting the output cycle T1 of the driving signal D is 0 or not. If CT1 > 0 NO), the processing routine of FIG. 2 is exited and the timer counter CT1 is decremented by "1" by the step S100 upon execution of the next routine.

Since the timer counter CT1 is set to the value corresponding to the output period T1 in the initial state, the decrement step S100 is executed until it is judged as NO in the step S112 and the timer counter CT1 becomes 0 do.

Thereafter, when it is determined in step S112 that CT1 = 0 (i.e., YES), the duty update time is reached, and therefore, a value corresponding to a constant output period T1 is set in the timer counter CT1 (step S113) The duty value of the drive signal D is set to the normal duty value TDb (= T1 x b / 100) (step S114).

Subsequently, the power transistor 12 is turned on by the drive signal D of the normal duty value TDb to drive the actuator 3 with the normal duty value TDb by flowing the drive current ID (step S115), and the processing routine of FIG. 2 It exits.

At this time, the calculated value b of the normal duty value TDb is set to, for example, about 30%.

Since the set (YES) state of the failure determination flag FF in step S101 and the normal (YES) state of the determination result J in step S111 are maintained, the output routine The duty value TDb is updated and set for each time T1, and the drive of the actuator 3 is controlled.

If it is determined in step S111 that the determination result J is failed (i.e., NO), an arbitrary failure process such as stopping the engine based on the failure of the actuator 3 is performed (step S116).

After confirming the soundness of the actuator 3 in this manner, the actuator 3 can be driven and controlled and the operation of the engine can be controlled.

At this time, the drive current (ID) flowing through the actuator 3 through the power transistor 12 (drive circuit) in the ECU 1 is detected and based on the current detection value Id, It is possible to perform a fault determination with high reliability.

That is, even if any one of the open-circuit failure or the short-circuit failure of the actuator 3 occurs, the current detection value Id becomes 0 and can not exceed the reference current value IR, and the comparison result E does not become H level. .

In addition, since the duty value of the drive signal D at the time of the failure determination is set to the forced duty value TDa equal to or larger than the predetermined value, the reference current value IR can be set to a comparatively large value so that the noise resistance of the comparison result E is also improved, 3 can be judged to be particularly effective in the case of a solenoid which is duty-driven in a predetermined period T1.

At this time, considering the rise delay of the drive current ID due to the reactance component of the actuator 3 and after the elapse of the predetermined time T2, the current detection value Id of the drive current ID rises to a sufficient determination level, It is possible to prevent the malfunction erroneous determination before the drive current ID of the normal actuator 3 rises sufficiently and improve the reliability of the malfunction determination.

[Example 2]

In the first embodiment, the actuator 3 is an electromagnetic solenoid mounted on an automobile engine. It is needless to say that other actuators having a reactance component exhibit the same effect.

It is also assumed that the actuator 3 includes a reactance component and after a predetermined time T2 elapses from the application of the driving signal D, the comparison result E between the current detection value Id and the reference current value IR is referred to. The presence or absence of a failure can be judged based on only the comparison result E between the current detection value Id and the reference current value IR in the case where the reactance component 3 does not include the reactance component.

[Example 3]

In the case of determining a failure, a forced duty value TDa larger than the normal duty value TDb is set. In this case, a state in which the normal duty value TDb becomes a particularly large duty value (about 80% . Thus, the means for setting the forced duty value TDa can be omitted, and the software configuration in the CPU 11 can be simplified.

In this case, in the initial state, the drive control based on the normal duty value TDb is performed irrespective of the set state of the failure determination flag FF, the duty value of the normal duty value TDb is determined subsequently to the determination step S101 of the failure determination flag FF, A comparison process of the current detection value Id and the reference current value IR is performed when the duty value TDb becomes equal to or greater than the predetermined value. Hereinafter, when the failure determination flag FF is set, only the normal drive control is continued.

[Effects of the Invention]

As described above, according to the first aspect of the present invention, there is provided an apparatus for determining the failure of the actuator 3, which is provided at an output terminal of a drive circuit (CPU 11 and power transistor 12) for driving the actuator 3, A current detector 13 for detecting a drive current ID flowing through the actuator 3 via the power transistor 12 and a reference current value IR for generating a reference current value IR corresponding to the drive current ID at the steady state of the actuator 3 A comparison circuit 15 for comparing the current detection value Id at the current detection section 13 with the reference current value IR and a comparator circuit 15 for comparing the current detection value Id at the actuator 3 (ECU 1) for judging whether or not a fault has occurred on the basis of the current value flowing into the drive circuit, it is possible to determine not only the breakage failure of the actuator 3 but also the short- There is an effect that a judgment device can be obtained.

Further, the drive circuit (CPU 11) includes duty calculation means for calculating the duty value of the drive current ID, and the duty calculation means (CPU 11) sets the duty value TDa of the drive current ID at the time of the failure determination to a predetermined value or more, There is an effect that an apparatus for judging an actuator failure having a particularly high reliability can be obtained with respect to the actuator 3 having a reactance component while the noise characteristic is improved.

According to the third aspect of the present invention, the actuator 3 includes a reactance component, and the failure determination means (CPU 11) judges the comparison result E of the comparison circuit 15 after the elapse of the predetermined time since the supply of the drive current ID It is possible to eliminate the influence of the rise delay of the current detection value Id by the reactance component and to prevent the erroneous erroneous determination at the time of normal operation and to provide the apparatus with high reliability.

Claims (2)

An actuator failure determination device, which is provided at an output terminal of a drive circuit for driving an actuator and determines whether or not a failure of the actuator is detected, comprising: a current detection unit for detecting a drive current flowing through the actuator via the drive circuit; A comparison circuit for comparing the current detection value in the current detection section with the reference current value and a comparator circuit for comparing the current detection value in the current detection section with the reference current value, Wherein the drive circuit has duty calculation means for calculating a duty value of the drive current, and the duty calculation means sets the duty value of the drive current at the time of a failure determination to a predetermined value or more The actuator failure determination device comprising: The actuator failure determination device according to claim 1, wherein the actuator includes a reactance component, and the failure determination means determines the comparison result of the comparison circuit after the elapse of a predetermined time after the drive current is supplied.