JPH07261837A - Abnormality detection device - Google Patents

Abstract

PURPOSE:To surely detect abnormal states of plural electric and electronic components from a small amount of information. CONSTITUTION:The microprocessor 30 of a controller 22 outputs an ON/OFF signal to MOSFET1-MOSFET6 through signal output ports OUT#1-OUT#6 to turn ON and OFF solenoids SOL1-S0L6. Further, A/D input ports MON#1- MON#6 are connected between the solenoids and the sources of the MOSFETs through resistances 34 and 36, and the driving voltages of the solenoids are divided by the resistances 34 and 36 and inputted. The microprocessor 30 calculates a reference voltage (estimated value of battery voltage) on the basis of the level of at least one solenoid whose connected MOSFET is OFF among the driving voltages of the respective solenoids, and judges the abnormal state of each solenoid from levels of the driving voltages of the respective solenoids, the state of the ON/OFF signal, and the level of the reference voltage. The voltage of a battery need not be monitored, so information required to detect abnormality may be small in amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting device, and more particularly to an abnormality detecting device suitable for detecting an abnormal state of a plurality of electric / electronic parts mounted on a vehicle.

[0002]

2. Description of the Related Art In recent years, the number of vehicles equipped with an anti-lock control device has increased significantly for the purpose of preventing wheel locks during vehicle braking and shortening the braking distance. The antilock control device basically applies a braking torque applied to each wheel by a wheel cylinder of a braking device provided for each wheel so that the difference between the vehicle body speed and the wheel peripheral speed does not exceed a predetermined value. The control of the braking torque is performed by reducing, increasing, and holding the hydraulic pressure of the brake fluid by the valve provided corresponding to each wheel cylinder.

By the way, the anti-lock control device is configured to include a microprocessor for controlling various controls, and a solenoid provided corresponding to a valve is connected via a switching element by an on / off signal output from the microprocessor. It is common to turn each valve on and off and drive each valve. In this configuration, however, if the solenoid cannot be driven normally due to disconnection of the solenoid drive wiring, etc. (hereinafter referred to as an abnormal state), However, it is required to detect this early and take some measure such as fail-safe.

In order to detect an abnormal state of the solenoid,
The drive voltage of each solenoid that is turned on and off by each switching element is taken in via the input port of the microprocessor, and the on / off state of each switching element detected by the on / off signal output by itself and the level of each drive voltage (high An abnormality detection device having a configuration in which a microprocessor determines whether or not a solenoid is in an abnormal state based on a level or a low level) has been conventionally proposed.

Further, in the above technique, the same number of input ports as the number of solenoids are occupied to monitor the driving voltage. Therefore, in order to solve this, Japanese Utility Model Laid-Open No. 62-201167 discloses that the output end is a micro port. A configuration is disclosed in which the drive voltage of each solenoid is input to a plurality of input terminals of an OR gate connected to the input port of the processor, and the abnormal state of the solenoid is determined based on the output signal of the OR gate. As a result, the number of input ports required to detect that the solenoid is in an abnormal state is only one, regardless of the number of solenoids.

[0006]

By the way, when the solenoid is in an abnormal state, for example, a short circuit occurs at both ends of the excitation coil of the solenoid, a disconnection of the wiring for driving the solenoid, a short circuit to ground, or a switching element for turning the solenoid on and off. Examples include leaks due to failures. Among these, wire breaks and shorts to ground can be detected by conventional anomaly detectors, but short-circuits at both ends of the exciting coil and leakage of switching elements can be detected at intermediate drive voltage levels. Therefore, in order to detect these accurately, it is necessary to compare the level of the drive voltage with the level of the power supply voltage. In particular, a battery is used as a power source in a vehicle, but the voltage of this battery fluctuates depending on the state of charge of the battery, various electrical components being turned on and off, and so on. By comparison, it is not possible to accurately detect an abnormal state of the solenoid or the like.

On the other hand, in each of the above-mentioned conventional techniques,
Since the level of the drive voltage is detected as the high level or the low level, only a part of various abnormalities occurring as an abnormal state of the solenoid can be detected. In order to reliably detect the abnormal state of the solenoid described above, in addition to the drive voltage, it is necessary to input the voltage of the battery as the power supply voltage to the failure diagnosis device to detect the abnormal state. With this configuration, the number of input signal lines and input ports must be increased, which causes a problem of cost increase.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain an abnormality detecting device capable of surely detecting an abnormal state of a plurality of electric / electronic components from a small amount of information.

[0009]

In order to achieve the above object, an abnormality detecting device according to the present invention is connected to a power supply and a switching means to which an on / off signal is supplied, and the switching means is operated according to the state of the on / off signal. Is an abnormality detection device for detecting an abnormal state of a plurality of electric / electronic components driven and stopped by being turned on / off and a drive voltage being turned on / off, each of the plurality of electric / electronic components and a switching means. Between the plurality of electric / electronic components having a voltage between the plurality of electric / electronic components, the reference voltage computing means for computing the level of the reference voltage based on the level of at least one driving voltage, and the plurality of electrical / electronic components. A state determination means for determining the state of the on / off signal supplied to each of the connected switching means, and a plurality of electric
Based on the level of the drive voltage of each electronic component, the state of the on / off signal supplied to each switching unit determined by the state determination unit, and the level of the reference voltage calculated by the reference voltage calculation unit. And a judging means for judging an abnormal state of each of the plurality of electric / electronic components.

In the invention according to claim 1, the reference voltage calculation means calculates the level of the reference voltage so that the variation of the drive voltage with the passage of time is averaged.
It is preferable.

Further, in the invention according to claim 1, in the electric
The electronic device further comprises a steady value judging means for judging whether or not the drive voltage of the electronic component is a value in the steady state of the electric / electronic component, and the reference voltage calculating means judges by the steady value judging means to be the value in the steady state. It is preferable to calculate the level of the reference voltage based on the generated driving voltage.

According to the third aspect of the invention, the steady value judging means can judge that the drive voltage whose value change over a predetermined time is equal to or less than a predetermined value is the value in the steady state.

Further, in the invention according to claim 3, the steady value judging means judges that the drive voltage of the electric / electronic component, which has been turned off or on for a predetermined time or more, is the value in the steady state. You can

[0014]

According to the present invention, the reference voltage calculation means controls the drive voltage of each of the plurality of electric / electronic components, which is the voltage between each of the plurality of electric / electronic components and the switching means.
The level of the reference voltage is calculated based on the level of at least one drive voltage. Further, as described in claim 2, it is preferable that the reference voltage calculation means calculates the level of the reference voltage so that the variation of the drive voltage with the passage of time is averaged. In the present invention, the level of the drive voltage of each of the plurality of electric / electronic components and the switching means determined by the state determination means are used by using the level of the reference voltage calculated as described above by the reference voltage operation means. An abnormal state of each of the plurality of electric / electronic components is determined based on the state of the supplied on / off signal and the calculated level of the reference voltage.

Further, in the present invention, as described in claim 3, the steady value judging means judges whether or not the driving voltage of the electric / electronic parts is a value at the steady time of the electric / electronic parts, and the reference voltage calculating means. It is preferable to calculate the level of the reference voltage based on the drive voltage determined to be the value in the steady state. The steady-state value determining means may determine that the driving voltage whose value change over a predetermined time is equal to or less than a predetermined value is the value in the steady state, as described in claim 4, As described above, the drive voltage of the electric / electronic component that has passed a predetermined time or more after being turned off or on may be determined to be a value in a steady state.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

[First Embodiment] FIG. 2 shows the present embodiment.
A vehicle braking device 10 that performs so-called anti-lock control is shown. Note that, in FIG. 2, pipes for guiding the brake fluid as the hydraulic fluid of the braking device 10 are shown by solid lines, and various wirings are shown by broken lines. The braking device 10 is provided with a brake pedal 12 arranged in the vehicle compartment, and the brake pedal 12 is connected via a booster 14 to the master cylinder 1
It is connected to 6. In this embodiment, the master cylinder 16
As the above, a tandem master cylinder in which two pressurizing chambers are formed in series is used.

One of the two pressurizing chambers of the master cylinder 16 is provided with a wheel cylinder 20A provided on the left front wheel of the vehicle and a wheel cylinder provided on the right rear wheel of the vehicle via pressure control devices 18A and 18B. 20B are respectively connected. The other of the two pressurizing chambers of the master cylinder 16 is connected to a wheel cylinder 20C provided on the left rear wheel of the vehicle and a wheel cylinder 20D provided on the right front wheel of the vehicle via pressure control devices 18C and 18D. Each is connected.

The pressure control device 18A includes a solenoid SOL ₁ ,
SOL ₂ and the pressure control device 18B are solenoids SOL ₃
The pressure control device 18C includes a solenoid SOL ₄ , and the pressure control device 18D includes solenoids SOL ₅ and SOL ₆ . In FIG. 2, the solenoid SOL
_{1 to} SOL ₆ are schematically shown as exciting coils. Each of the exciting coils of the solenoids SOL _{1 to} SOL ₆ has one end connected to a positive terminal (shown as + B in FIG. 2) of a vehicle battery (not shown) and the other end connected to the controller 22 (the connection with the controller 22 will be described later in detail. Each of them is turned on and off by the controller 22. The pressure control devices 18A to 18D have a built-in solenoid S
When the OL is turned on and off, the pressure of the brake fluid in the wheel cylinders 20A to 20D is increased or decreased via a valve (not shown).

Rotating bodies that rotate together with the wheels are attached to the four wheels mounted on the vehicle (not shown), and peripheral speeds (wheel speeds) of the rotating bodies are provided near the rotating bodies. Wheel speed sensors 24A to 24D for detecting (V _W is proportional to the peripheral speed of the rotating body) are provided. The wheel speed sensors 24A to 24D are each connected to the controller 22 and output the detection result to the controller 22. Further, the controller 22 has a brake switch 26 which is turned on when the brake pedal 12 is depressed by an occupant.
Are connected.

On the other hand, FIG. 1 shows a microprocessor 30 which constitutes a part of the controller 22 and a solenoid drive section 32. Solenoids SOL _{1 to} SOL ₆
The other end of the exciting coil is the power M of the solenoid drive unit 32.
OSFET ₁ to power MOSFET ₆ (hereinafter, simply MO
SFET). MOS
The FET _{1 to} MOSFET ₆ correspond to the switching means of the present invention, the gates are connected to the signal output ports OUT # 1 to OUT # 6 of the microprocessor 30, and the sources are grounded.

Further, the solenoids SOL _{1 to} SOL ₆ and M
Between the drains of OSFET _{1 to} MOSFET ₆ ,
One end of each of the resistors 34A to 34F is connected. The other ends of the resistors 34A to 34F are connected to the other ends of the resistors 36A to 36F whose one ends are grounded. Also, the resistance 3
4A to 34F and resistors 36A to 36F are provided between the A / D input ports MON # 1 to M of the microprocessor 30, respectively.
Connected to ON # 6, solenoids SOL _{1 to} SO
The potential between L ₆ and the sources of MOSFET ₁ to MOSFET ₆ (hereinafter, these are referred to as drive voltages of the solenoids) is divided by resistors 34 and 36 and input to the microprocessor 30.

The resistors 34A to 34F also have a role of limiting the current input to the microprocessor 30. The resistances 34A to 34F and the resistances 36A to 36F are A / Ds of the drive voltage even when the battery voltage becomes maximum.
Each electric resistance and voltage division ratio are set so that the converted value can be normally A / D-converted without being saturated.
Therefore, the electric resistances of the resistors 34A to 34F and the resistors 36A to 36F have the same value if SOL _{1 to} SOL ₆ have the same configuration.

The microprocessor 30 includes an A / D converter (not shown) provided corresponding to each of the A / D input ports MON # 1 to MON # 6, and the A / D input port MON # is provided. The drive voltage input via 1 to MON # 6 is converted into digital data representing the level of the drive voltage by the A / D converter and is taken into the microprocessor 30.

Next, the operation of the first embodiment will be described. First, the control processing of the brake pressure by the microprocessor 30 will be described. When the microprocessor 30 detects that the brake switch 26 is turned on and braking is being performed, the wheel speed sensors 36A to 36D are set at predetermined time intervals.
The vehicle speed V _GS is estimated based on the wheel speed V _W of the four wheels by taking in the wheel speed V _W detected by
_In order to prevent the difference between _W and the vehicle body speed V _{GS from} exceeding a predetermined value, the MOSFETs _{1 to} MOSFET are controlled by the ON / OFF signals output from the signal output ports OUT # 1 to OUT # 6.
₆ and solenoids SOL _{1 to} SOL ₆ are turned on and off.

More specifically, when the brake pressure is reduced or increased, the microprocessor 30 determines the gradient of the pressure reduction and increase and determines the on / off duty ratio of each solenoid according to the determined gradient. Then, an on / off signal for turning on / off the solenoid at the determined duty ratio is output via the signal output ports OUT # 1 to OUT # 6. The MOSFETs _{1 to 6} are turned on only when the on / off signals output from the signal output ports OUT # _{1 to} OUT # 6 are at high level. When the MOSFET is turned on, the exciting coil of the solenoid SOL connected to the turned-on MOSFET is excited, the valve is switched, and the pressure (brake pressure) of the brake fluid in the wheel cylinder 20 is increased or decreased.

Next, the abnormality monitoring process of the solenoid SOL by the microprocessor 30 will be described. The microprocessor 30 periodically executes the abnormality monitoring processing shown by the flowchart in FIG. 3 at predetermined time intervals in parallel with the above-described control of the brake pressure. In step 100 of the flowchart of FIG. 3, the reference voltage V _REF calculation process is performed.
This reference voltage V _REF calculation process will be described with reference to the flowchart of FIG.

In step 110, the value of the counter X is initialized to "1". In step 112, the MOSF connected to the solenoid SOL _x (here, SOL ₁ ) is connected.
It is determined whether ET _x (that is, MOSFET ₁ ) is on. This determination is performed by determining whether the on / off signal supplied to MOSFET _x is at high level. If the determination in step 112 is negative, the driving voltage V of the solenoid SOL ₁ is determined in step 114.
_The data representing ₁ is fetched through the A / D input port MON # 1, the data is set as the data VSOL ₁ and is stored in the memory or the like, and the process proceeds to step 118. When the determination in step 112 is affirmative, the data VSOL ₁ set in the previous control cycle and stored in the memory is fetched in step 116.

[0029] In the next step 118, whether the value of counter X becomes "6", i.e. determines whether all set data VSOL ₁ ~ data VSOL _6. If the determination in step 118 is negative, "1" is added to the value of the counter X in step 120, the process returns to step 112, the solenoid SOL to be processed is switched, and the same process is performed. From the above, steps 112 to 120 are repeated until the determination in step 118 is affirmed, and the data VSOL _{1 to} VSOL _{6 are set} as MO.
For the solenoid whose SFET is off, the drive voltage of the solenoid is set, and for the solenoid whose MOSFET is on, the previously used data is set again.

When the determination at step 118 is affirmative, the routine proceeds to step 122, and the data VSOL _{1 to} VSOL ₆ having the values set as described above are rearranged in the descending order of the values. In the next step 124, the data VS is set as the reference voltage V _REF.
The value is N-th among OL _{1 to} VSOL ₆ (where N is 1 ≦ N
High data is set to ≤6. As will be described later, it is preferable to set N to a value of “2” or more (particularly “2” or “3”). In the next step 126, the reference voltage V _REF determined in step 124
_Is stored as the reference voltage V _REF (i) in the current control cycle, and the process proceeds to step 102 in the flowchart of FIG.

At step 102, solenoid abnormality detection processing is performed. Regarding this solenoid abnormality detection processing, FIG.
This will be described with reference to the flowchart in FIG. Step 150
Then, the value of the counter X is set to "1". Next step 15
At 2, the current drive voltage V _x of the solenoid SOL _x (here, SOL ₁ ) is taken in. In step 154, it is determined whether or not the MOSFET _x connected to the solenoid SOL _x is on, based on the level of the on / off signal supplied to the MOSFET _x . If the determination in step 154 is affirmative, it is determined whether or not the drive voltage V _x is larger than a predetermined value ΔVOC that is the threshold value for abnormality detection when the MOSFET is on, and step 154
When the determination of No is denied, M is calculated from the reference voltage V _REF .
It is determined whether the drive voltage V _x is smaller than a value obtained by subtracting a predetermined value ΔVL which is a threshold value for abnormality detection when the OSFET is off.

As shown in FIG. 6B, the solenoid SO
When L is in the normal state, the drive voltage of the solenoid SOL is
When the MOSFET is off, the power supply voltage (reference voltage)
Pressure V _REF), Which is slightly lower than
Level slightly higher than "0" when T is on
Changes in. However, as shown in FIG.
Disconnection of wiring connected to solenoid SOL, or
If a short-circuit to the ground of the wiring
In this case, the MOSFET turns off as shown in FIG.
Drive voltage V_xIs almost zero.
Therefore, these abnormalities are affirmative in the determination in step 158.
Is detected by

Further, as shown in FIG. 6 (A), when both ends of the exciting coil of the solenoid SOL are short-circuited, the level of the drive voltage V _x when the MOSFET is turned on is a predetermined value compared to the normal state. It rises more. Therefore, this abnormality is detected by the affirmative determination in step 156. Furthermore, as shown in FIG.
When the FET fails and a leak (leakage current) occurs regardless of whether the MOSFET is on or off, the level of the drive voltage V _x when the MOSFET is off is lower than the normal level by a predetermined value or more. Therefore, this abnormality is detected in step 15
It is detected when the judgment of 8 is affirmed.

The above-mentioned leak is a leak to the extent that the solenoid SOL malfunctions due to the leak current, and the above-mentioned ΔVL is the reference voltage V _REF −ΔVL, and the leak has occurred and the MOSFET is off. Sometimes A /
It is higher than the level of the drive voltage input to the D input port MON, and is lower than the level of the drive voltage input to the A / D input port MON under normal conditions and when the MOSFET is off. Is set to. In addition, ΔVOC is a short circuit of the exciting coil and the MOSFET
Is set to a value lower than the level of the drive voltage input when is ON, and larger than the level of the drive voltage input during normal operation and when the MOSFET is ON.

By the way, when the driving voltage is inputted to the microprocessor 30 as high level or low level as in the prior art, two kinds of threshold values (ΔVOC and V _REF −ΔVL) are set as described above. It is impossible to compare the magnitudes of the above and the respective values, and even if the level that becomes the boundary between the low level and the high level is determined corresponding to one of the two types of threshold values described above, FIG. It is not possible to detect all the abnormalities shown in to.

On the other hand, in the present embodiment, if the determination at step 156 or step 158 is affirmative, the process shown in FIG.
Since it can be judged that at least one of the abnormalities indicated by (1) to (A) has occurred, step 1
At 60, for example, a fail-safe operation such as stopping the anti-lock control or switching a part of the anti-lock control is performed, and at step 162, an ABS warning light (not shown) provided on the instrument panel of the vehicle is operated. The light is turned on, the occupant is notified that an abnormality has occurred, and the process proceeds to step 164. Instead of turning on the ABS warning light, for example, the ABS warning light may be blinked, the brightness may be increased or decreased, or the display color of the ABS warning light may be changed. If the determination in step 156 or step 158 is negative, the solenoid SOL _x is determined to be normal, and step 164 is performed without any processing.
Move to.

In step 164, it is determined whether the counter X has reached "6". If the determination in step 164 is negative, "1" is added to the counter X in step 166, the process returns to step 152, the solenoid SOL that is the target of abnormality detection is switched, and the same processing is performed.
As described above, steps 152 to 166 are repeated until the determination in step 164 is affirmed, and the abnormality detection for the solenoids SOL _{1 to} SOL ₆ is performed.

As described above, in the first embodiment, the solenoid S is used without monitoring the voltage of the battery as the power source.
_One of the driving voltages of OL _{1 to} SOL ₆ is set to the reference voltage V
_REF and using the reference voltage V _REF as the solenoid SOL
_Since each of the abnormal states of _{1 to} SOL ₆ is determined, the abnormal state of the solenoids SOL _{1 to} SOL ₆ can be reliably detected and the required microprocessor 3
The number of 0 A / D input ports can be reduced.

[Second Embodiment] Next, a second embodiment of the present invention will be described. Since the second embodiment has the same configuration as the first embodiment, the description thereof is omitted, and the reference voltage V _REF calculation processing according to the second embodiment will be described below with reference to the flowchart of FIG. 7. Only parts different from the first embodiment will be described.

In the reference voltage V _REF calculation processing according to the second embodiment, in step 122, the data VSOL _{1 to} VSOL ₁
After performing the rearrangement of ₆ , the data V
As SOLMAX, the maximum value of the data VSOL _{1 to} VSOL ₆ is set. In the next step 132, the data VS
Data having the second highest value among the data VSOL _{1 to} VSOL ₆ is set as OLMAX ₋₁ . In the next step 134, as shown in the following equation (1), the reference voltage V _REF
As data VSOLMAX and data VSOLMAX
Calculate the average value with _-1 .

V _REF = (VSOLMAX + VSOLMAX ₋₁ ) / 2 (1) In the next step 136, the reference voltage V _REF obtained above is stored as the reference voltage V _REF (i) in the current control cycle, and the reference voltage V _REF is stored. _{The REF} calculation process ends. According to the second embodiment, the maximum value of the data VSOL _{1 to} VSOL ₆ is
Even if the value is higher than the battery voltage due to the ripple component superimposed on the drive voltage, the average value with the data having the second highest value is used as the reference voltage V _REF , so that the effect described in the first embodiment can be obtained. In addition, even if the maximum value or any _{one of} the data VSOL _{1 to} VSOL ₆ selected in the first embodiment is an excessive value higher than the battery voltage, the influence due to this can be eliminated, By improving the accuracy of the voltage V _REF , the effect that the abnormal state can be detected more accurately can be obtained.

[Third Embodiment] Next, a third embodiment of the present invention will be described. Since the third embodiment also has the same configuration as the first embodiment, the description thereof will be omitted, and the reference voltage V _REF calculation processing according to the third embodiment will be described below with reference to the flowchart of FIG. Only parts different from the first embodiment will be described.

Reference voltage V according to the third embodiment_REFArithmetic processing
The reason is that in step 124, the reference voltage V_REFAs the day
VSOL₁~ VSOL₆Day with the highest N value
After setting the parameter, the next step 125
Voltage V set in the period_REFTake (i-1) and
The reference voltage calculated in step 124 according to the equation (2)
V _REFAnd the reference voltage V taken in as described above_REFAverage with (i-1)
The value is the reference voltage V in this control cycle_REFSet as
To do.

V _REF = {V _REF + V _REF (i-1)} / 2 (2) Then, in the next step 126, the reference voltage V _REF obtained above is used as the reference voltage V _REF (i in the present control cycle. ) _Is stored, and the reference voltage V _REF calculation process ends. According to the third embodiment, since the reference voltage V _REF is calculated by averaging the variation of the driving voltage with the passage of time, the reference voltage V _REF changes in response to an instantaneous voltage change. Is prevented, the accuracy of the reference voltage V _REF is improved as compared with the first embodiment. Therefore, it is possible to reduce the possibility of erroneously determining the abnormal state, and to detect the abnormal state more accurately.

When the number of solenoids that are turned on increases (that is, when the number of solenoids that are turned off decreases), in step 116, a solenoid whose data VSOL _x has a value earlier than the previous control cycle is generated. However, if this data VSOL _x is adopted as the reference voltage V _{REF in} step 124, a value that reflects the current state cannot be obtained as the reference voltage V _REF in the current control cycle. , By taking the average with the reference voltage V _REF (i-1) in the previous control cycle, the possibility of occurrence of the inconvenience as described above is reduced.

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described. Since the fourth embodiment has the same configuration as the first embodiment, the description thereof will be omitted, and the reference voltage V according to the fourth embodiment will be described below with reference to the flowchart of FIG.
Regarding the _REF calculation process, only the part different from that of the second embodiment will be described.

In the reference voltage V _REF calculation processing according to the fourth embodiment, in step 134, the reference voltage V _{REF is} calculated according to the equation (1).
After calculating _REF , the next step 135 takes in the reference voltage V _REF (i-1) set in the previous control cycle, and the reference voltage V _REF calculated in step 134 is calculated by the equation (2).
The average value of _REF and the taken-in reference voltage V _REF (i-1) is set as the reference voltage V _REF in the current control cycle. Then, in the next step 136, the reference voltage V _REF obtained above is used as the reference voltage V in the current control cycle.
_It is stored as _REF (i), and the reference voltage V _REF calculation process ends.

Also in the fourth embodiment, similarly to the third embodiment, since the reference voltage V _{REF in} which the variation of the driving voltage with the passage of time is averaged is calculated, the comparison with the second embodiment is made. However, the accuracy of the reference voltage V _REF is improved and the abnormal state can be detected more accurately.

[Fifth Embodiment] Next, a fifth embodiment of the present invention will be described. Since the configuration of the fifth embodiment is also the same as that of the first embodiment, the description thereof will be omitted, and the operation of the fifth embodiment will be described below.

The inventor of the present application conducted an experiment on the fluctuation of the drive voltage of the solenoid, and as a result, when the MOSFET was turned off and the solenoid was changed from on to off, a large surge voltage was superimposed on the drive voltage of the solenoid and the drive voltage was changed. It was found that there was a particularly large fluctuation (as an example, FIG.
(See (A)). On the other hand, in the above-described embodiment, in order to eliminate the influence of the ripple component superimposed on the drive voltage, the Nth (N ≧ 2) drive voltage from the upper order of the drive voltage of the plurality of solenoids is arranged in descending order of level. It may be used as a reference voltage (first embodiment) or n pieces (n ≧ nth) from the uppermost Nth.
The average value of the driving voltage in 2) is used as the reference voltage (second embodiment), or the average value of the temporary reference voltage obtained as described above and the past reference voltage is used as the reference voltage (third and third embodiments). Therefore, if N or more solenoids change from on to off at the same time, the surge voltage superimposed on the drive voltage of each solenoid affects the reference voltage V _REF.
There was a case that a proper value could not be set.

As described above, unless a proper value is set as the reference voltage V _REF , it is difficult to accurately detect the abnormal state of the solenoid. Therefore, in the fifth embodiment, the reference as described below is used. The voltage V _REF calculation process (see FIG. 10) is performed. That is, in step 170, the counter X
Is set to 1 and the maximum value V _max is set to 0. In step 172, data representing the drive voltage V _x of the solenoid SOL _x is fetched through the A / D input port MON # X, and the data is set as data VSOL _x (i) representing the drive voltage in the current control cycle. Store in memory etc. In step 174, the data VSOL _X (i-1) representing the drive voltage in the previous control cycle is read, and the data VSOL of this control cycle is read according to the following equation (3).
The difference (absolute value) V _sub1 from _X (i) is calculated.

V _sub1 = | VSOL _X (i) −VSOL _X (i−1) | (3) In the next step 176, it is determined whether the calculated difference V _sub1 is smaller than the threshold value. If the determination is negative, the process proceeds to step 186, but if the determination is affirmative, the data VSOL _X (i-2) representing the drive voltage in the previous previous control cycle is read in step 178, and the next The data VSOL of the current control cycle according to the equation (4)
The difference (absolute value) V _sub2 from _X (i) is calculated.

V _sub2 = | VSOL _X (i) −VSOL _X (i−2) | (3) In the next step 180, it is determined whether the calculated difference V _sub2 is smaller than the threshold value. Note that steps 174-1
Reference numeral 80 corresponds to the steady value determining means of claim 4, and the magnitude of the change (difference V _{su b1} ) in the value of the drive voltage over a predetermined time for one cycle in the control cycle and two cycles in the control cycle. Whether or not the drive voltage is the steady-state value of the solenoid is determined based on whether or not the magnitude of the change in the drive voltage value (difference V _sub2 ) over a predetermined time is less than the threshold value. Step 1
When the determination of 80 is negative, the process proceeds to step 186, but when the determination of step 80 is affirmative, it is determined at step 182 whether the data VSOL _X (i) is larger than the maximum value V _max . If the determination is affirmative, the data VSOL _X (i) is substituted for the maximum value V _max in step 184, and then the process proceeds to step 186.

In step 186, it is determined whether or not the processes of steps 172 to 186 have been performed for all the solenoids based on whether or not the value of the counter X has reached "6", which is the total number of solenoids. If the determination is negative, "1" is added to the value of the counter X in step 188, the process returns to step 172, the solenoid SOL to be processed is switched, and the same processing is performed. When the determination in step 186 is affirmative, the reference voltage V _REF is determined in step 190.
Then, the maximum value V _max is set, and the reference voltage V _REF setting process ends.

Here, in the solenoid SOL _n changed from ON to OFF, the driving voltage temporarily fluctuates largely as shown in FIG. 11A, and the data VSOL _n representing the value of the driving voltage is also large. It will fluctuate. In the reference voltage V _REF setting process described in the first to fourth embodiments, when N or more solenoids change from on to off, the reference voltage V _REF changes as shown by the dashed line in FIG.
The value of _REF will fluctuate.

However, in the fifth embodiment, for the solenoid SOL _n that has changed from ON to OFF, the difference V _{sub1 from the} previous data is shown until the fluctuation of the driving voltage _subsides , as shown in FIG. _11C. Is larger than the threshold value (the same applies to the difference V _sub2 ), the reference voltage V
Since it is excluded from the calculation of _REF, the reference voltage V _REF shown by the alternate long and short dash line in FIG. Note that the solid line in FIG. 11D represents the transition of the reference voltage V _REF when the data VSOL _n is assumed to be the maximum value, and the broken line in the same figure indicates a value corresponding to the value of the drive voltage of another solenoid. Represents that it changes.

As described above, in the fifth embodiment, the data VSOL representing the value of the drive voltage of each solenoid taken in is obtained.
_Data in which at least one of the difference V _sub1 and the difference V _sub2 in _X (i) is _{equal to} or more than the threshold value is excluded, and the drive voltage determined to be the value in the steady state of the solenoid, that is, the difference V _sub1 and the difference V _sub1 Since V _{sub2 sets} the maximum value of the drive voltages each smaller than the threshold value as the reference value V _REF , it is not affected by the surge voltage superimposed on the drive voltage of the solenoid changed from ON to OFF, An appropriate value can be set as the reference voltage V _REF . Therefore, the abnormal state of each solenoid can be detected more accurately.

[Sixth Embodiment] Next, a sixth embodiment of the present invention will be described. Since the sixth embodiment has the same configuration as the first embodiment, the description thereof will be omitted, and the operation of the sixth embodiment will be described below.

In the sixth embodiment, the on / off shown in FIG.
The continuous state determination process is periodically executed. Sanawa
Then, in step 194, 1 is substituted into the counter X, and the step
196 solenoid SOL_xIs turned on
Determine whether. If the determination is positive, step 19
8 Solenoid SOL_xClear off time counter
Then, in step 200, the solenoid SOL_xOn time
Count up Unta. On the other hand, the judgment is negative
If so, in step 202 the solenoid SOL _xof
Clear the on-time counter and go to step 204
Id SOL_xUp the off-time counter of
It

At the next step 206, the solenoid SO
It is determined whether the count value of the L _x on-time counter or the off-time counter has become larger than the threshold value. If the determination is negative, the on / off state continuous flag of the solenoid SOL _x is reset in step 208, and if the determination is affirmative, the on / off state continuous flag of the solenoid SOL _x is set in step 210. To do. In step 212, it is determined whether or not the processes in steps 196 to 212 have been performed for all the solenoids based on whether or not the value of the counter X has reached "6", which is the total number of solenoids. If the determination is negative, the counter X is incremented in step 214 and the process returns to step 196.
The solenoid SOL to be processed is switched and the same processing is repeated. If the determination in step 212 is affirmative,
The on / off state continuous determination processing ends. The on / off state continuous determination processing corresponds to the steady value determination means of claim 5, and when a predetermined time or more has elapsed after each solenoid was turned on or off, the corresponding on / off state continuous flag is set. In other cases, for example, immediately after changing from on to off, the flag is reset.

Next, the reference voltage V _REF calculation processing according to the sixth embodiment will be described with reference to the flowchart of FIG. In step 218, the value of the counter X is set to 1 and the value of the maximum value V _max is set to 0. In step 220, it is determined whether or not the on / off state continuous flag of the solenoid SOL _x is set. If the determination is negative, there is a high possibility that the drive voltage is fluctuating due to superimposition of surge voltage, so that the process proceeds to step 228 without any processing, but if the determination is positive, Takes in the drive voltage VSOL _x of the solenoid SOL _{x in} step 222.

At the next step 224, it is determined whether or not the drive voltage VSOL _x thus taken in is larger than the maximum value V _max . If the determination is negative, the process proceeds to step 228, but if the determination is affirmative, step 226
After substituting the data VSOL _X for the maximum value V _max in step S28, the process proceeds to step 228. In step 228, the counter X
Steps 220-228 for all solenoids based on whether the number of solenoids has reached the total number of solenoids "6".
It is determined whether or not the process of (1) is performed. When the determination is negative, the counter X is incremented in step 230, the process returns to step 220, and the solenoid SO to be processed is processed.
L is switched and the same processing is repeated. When the determination in step 228 is affirmative, the maximum value V _max is set as the reference voltage V _{REF in} step 232, and the reference voltage V _REF is set.
The setting process ends.

As an example, as shown in FIGS. 14A and 14B, assume that the solenoid SOL _n and the solenoid SOL _{n + 1} change from on to off at different timings.
In the first to fourth embodiments, the data VSOL _n and the data V taken in as the drive voltage for both solenoids are used.
SOL _{n + 1} varies as indicated by the alternate long and short dash line in FIGS. 14C and 14D. Therefore, for example, simply use the data VS
When the maximum value of OL _x is assumed that the reference voltage V _REF, the value of the reference voltage V _REF is varied as shown by a chain line in FIG. 14 (E), also described in the first to fourth embodiments Even in the reference voltage V _REF setting process, if the data VSOL _x of N or more solenoids changes as shown in FIG. 14C or 14D, the value of the reference voltage V _REF becomes as shown in FIG.
It changes as shown by the one-dot chain line in (E).

On the other hand, in the sixth embodiment, the flag of the solenoid SOL _n is reset during the period in which the drive voltage of the solenoid SOL _n is changing, and the solenoid SO
During the period when the driving voltage of L _{n + 1} is fluctuating, the solenoid S
Since the flag of OL _{n + 1} is reset, FIG.
As indicated by the solid lines in (C) and (D), the data VSOL _n and the data VSO during the period in which the drive voltage is fluctuating.
The value of L _{n + 1} is not updated. Therefore, the fluctuating drive voltage is not fetched as the data VSOL _x and the reference voltage V _REF is not calculated, and the drive voltage judged to be the value in the steady state of the solenoid, that is, the predetermined voltage after being turned on or off. Since the maximum value of the drive voltage of the solenoid that has passed the time is set as the reference value V _REF , the reference voltage V _{REF is} not affected by the surge voltage superimposed on the drive voltage of the solenoid that has changed from ON to OFF. Can be set to a proper value. Therefore, the abnormal state of each solenoid can be detected more accurately.

Further, in the sixth embodiment, the drive voltage of the solenoid is not taken in only during the time when the on / off state continuous flag is reset, so this predetermined time is set to the time when the surge voltage is superimposed on the drive voltage. If so, the reference voltage is corrected (data VSOL _x
Will be corrected). Therefore, compared with the fifth embodiment, even if the drive voltage fluctuates significantly due to, for example, fluctuations in the battery voltage, the fluctuation of the drive voltage can be reflected in the reference voltage. Can be set. The reference voltage is corrected as follows.
As described above, the present invention is not limited to not updating the data VSOL _x during the period when the surge voltage is superimposed, and is not limited to the data VSOL _{x that} is separately determined during the period when the surge voltage is superimposed. Any value may be used.

Although the solenoid of the antilock control device has been described as an example of the electric / electronic component in the above, the present invention is not limited to this. INDUSTRIAL APPLICABILITY The present invention is particularly effective when the power supply voltage is unstable and the drive voltage fluctuates, such as in a battery. For example, a solenoid for driving various valves mounted on a vehicle, a hydraulic pump for an active suspension, etc. As described above, it is preferable to apply the method to the detection of an abnormal state of electric / electronic components in which a plurality of the same type are mounted on a vehicle. Further, the electric / electronic component according to the present invention is not limited to the detection of an abnormal state of an electric / electronic component for a vehicle, and is applied to the detection of an abnormal state of, for example, a plurality of lamps each turned on / off by a switch. It is also possible.

Further, in the above description, the ABS warning lamp is turned on when the abnormal state of the solenoid is detected. However, the information for identifying the solenoid detecting the abnormal state or the content of the abnormality that has occurred is displayed. You may do it. Also, different fail-safe processing may be performed according to the determined abnormality content.

Further, the reference voltage V described in each of the above embodiments is used.
_{In the REF} calculation process, when the solenoid SOL _x is turned on (when the determination in step 112 is affirmative)
The value set in the previous control cycle is set as the data VSOL _x (step 116), but the data VSOL _x is not limited to this, and the data of the drive voltage input to the A / D input port MON is set. You may use it as it is.

In the third and fourth embodiments, the average value of the temporarily obtained reference voltage V _REF and the reference voltage V _REF (i-1) calculated in the previous control cycle is used as the average value of the current control cycle. in had a reference voltage V _REF (i), is not limited thereto, the reference voltage is respectively calculated in the plurality of control cycles _{V REF (i-1),} V REF (i-2) ... and the The average value may be calculated as the reference voltage V _REF in the current control cycle.

Further, although the example in which the power MOSFET is used as the switching means has been described above, the invention is not limited to this. For example, various switching means such as transistors and FETs, relays, or switches that are manually turned on and off. May be

Further, although the single microprocessor 30 is used to detect the on / off state of the MOSFET and the abnormal state of the solenoid in the above description, the present invention is not limited to this, and control circuits of different microprocessors or the like are used. May be performed in. In this case, if the on / off signal for turning on / off the switching means is input to the microprocessor that detects the abnormal state of the solenoid, the state of the on / off signal can be determined.

Further, although the example in which the present invention is applied to the solenoid of the braking device for performing the anti-lock control has been described above, the invention is not limited to this, and the slip amount of the drive wheels at the time of vehicle acceleration is appropriately large. The present invention can be applied to a braking device that performs slip control such as acceleration slip control that controls the braking torque applied to the drive wheels so as to be maintained at this level.

Further, in the above, one end of the exciting coil of the solenoid SOL as an electric / electronic component is connected to the power source,
A configuration in which the other end is grounded via a MOSFET as a switching means is shown as an example, and the voltage between the electric / electronic component and the switching means, that is, the voltage of the terminal on the ground side of the electric / electronic component is used as the driving voltage. However, it is not limited to this. The drive voltage of the electric / electronic component in the present invention is turned on / off by turning on / off the switching means among the terminal connected to the power supply side and the terminal connected to the ground side provided in the electric / electronic component ( This is the potential (voltage) of the terminal on the side where the potential changes). Therefore, in the case where one end of the electric / electronic component is connected to the power supply via the switching means and the other end is grounded, the voltage between the electric / electronic component and the switching means, that is, the electric / electronic component The voltage at the terminal on the power supply side may be used as the drive voltage for the electric / electronic component.

The calculation of the level of the reference voltage in the present invention can use the drive voltage of the electric / electronic component in which the connected switching means is off, as described in the above embodiment, and the connection can be made. The drive voltage level of a single electric / electronic component among the drive voltage of the electric / electronic component whose switching means is turned off, for example, the drive voltage of the Nth from the top (N is a natural number) in descending order of level. Is used as the reference voltage level (for example, the first
(Described in the embodiment), or based on the drive voltage levels of a plurality of electric / electronic components, for example, the nth from the top n
It is possible to calculate the average value of the levels of the individual (n is a natural number of 2 or more) drive voltages as the level of the reference voltage (one example is described in the second embodiment).

When the level of the Nth highest drive voltage is set as the level of the reference voltage, it is preferable not to use the drive voltage having the highest level (that is, N ≧ 2). This is because, especially in vehicles, ripples are superimposed on the drive voltage due to fluctuations in the voltage of the battery as the power supply, and the level of the drive voltage may momentarily exceed the level of the battery voltage. Is likely to exceed the battery voltage level. By not using the drive voltage having the highest level for the calculation, the accuracy of the level of the reference voltage with respect to the level of the actual power supply voltage can be improved. Also, do not use the one with the smallest drive voltage level among multiple electric / electronic components for the calculation of the reference voltage level, as the corresponding electric / electronic component may have failed. Is preferred. In this way, by selecting a value having a low probability of including an error due to noise or a failure and calculating the reference voltage, the accuracy of the reference voltage can be improved.

The reference voltage is calculated by, for example, a value obtained by arithmetically averaging the present drive voltage with the past drive voltage or the reference voltage calculated in the past (one example is described in the third and fourth embodiments), or each. Can be realized by giving a predetermined weight to and calculating a weighted average as a reference voltage. As a result, the ripple component (variation component) superimposed on the drive voltage is averaged and averaged, so that the accuracy of the reference voltage can be further improved. As the drive voltage according to the second aspect of the present invention, it is possible to use the level of the Nth drive voltage from the higher order or the average value of the levels of the nth drive voltage from the higher order to the Nth level or the like in order of increasing level. It goes without saying that you can do it.

As described in the above embodiment, the determination means determines the abnormal state of each of the plurality of electric / electronic components. For example, when the ON / OFF signal in the OFF state is supplied to the switching means, the drive voltage When the level is almost zero, it can be determined that the wiring is broken or the wiring is short-circuited to the ground as in the conventional case. Further, when the level of the drive voltage when the ON / OFF signal of the ON state is supplied to the switching means is higher than zero by a predetermined value or more, it can be determined that the electric / electronic component is in the short-circuited state. Furthermore,
When the level of the drive voltage when the on / off signal in the off state is supplied to the switching means is lower than the reference voltage by a predetermined value or more, it can be determined that the switching means has a leak (leakage current).

As described above, in the present invention, the level of the reference voltage calculated based on the level of at least one drive voltage among the drive voltages of the plurality of electric / electronic components is regarded as the level of the power supply voltage, and the reference voltage is calculated. Using multiple electric
Since the abnormal state of the electronic component is determined, various abnormal states can be detected for each electric / electronic component based on the drive voltage of each of the plurality of electric / electronic components without monitoring the power supply voltage. . Therefore, it is possible to reliably detect an abnormal state of a plurality of electric / electronic parts from a small amount of information, and it is necessary, for example, when the reference voltage calculating means, the state judging means and the judging means of the present invention are constituted by a digital computer. The number of A / D input ports can be reduced, and the number of input signals can be reduced even when configured with an analog computer (circuit).

[0079]

As described above, according to the present invention, at least one drive voltage among the drive voltages of the plurality of electric / electronic components, which is the voltage between each of the plurality of electric / electronic components and the switching means. The level of the reference voltage is calculated based on the level of, the level of the drive voltage of each of the plurality of electric / electronic components, the state of the on / off signal supplied to each switching unit determined by the state determination unit, and Since the abnormal state of each of the plurality of electric / electronic components is determined based on the calculated level of the reference voltage, the abnormal state of the plurality of electric / electronic components can be reliably detected from a small amount of information. , Which has an excellent effect.

Further, the drive voltage of the electric / electronic parts is
By determining whether or not the value of the electronic component is in the steady state and calculating the reference voltage level based on the drive voltage that is determined to be the value of the electrical or electronic component in the steady state, a plurality of electrical and electronic components can be calculated. The effect that the abnormal state of the component can be detected more accurately is obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a solenoid drive device according to an embodiment.

FIG. 2 is a schematic configuration diagram of a braking device.

FIG. 3 is a flowchart showing a main routine of an abnormality monitoring process which is periodically executed at predetermined time intervals as an operation of the present embodiment.

FIG. 4 is a flowchart showing a reference voltage V _REF calculation process according to the first embodiment.

FIG. 5 is a flowchart showing an example of a solenoid abnormality detection process.

FIG. 6A is an explanatory diagram showing a solenoid abnormality that can be detected in the present embodiment, and FIG. 6B is a diagram showing a change in drive voltage when an abnormality occurs.

FIG. 7 is a flowchart showing reference voltage V _REF calculation processing according to the second embodiment.

FIG. 8 is a flowchart showing a reference voltage V _REF calculation process according to the third embodiment.

FIG. 9 is a flowchart showing reference voltage V _REF calculation processing according to the fourth embodiment.

FIG. 10 is a flowchart showing reference voltage V _REF calculation processing according to the fifth embodiment.

FIG. 11 shows a solenoid that has changed from on to off.
(A) changes in drive voltage, (B) changes in captured drive voltage value, (C) changes in difference from the previous drive voltage value,
(D) is a diagram showing the transition of the value of V _REF of the reference voltage.

FIG. 12 is a flowchart showing an ON / OFF state continuous determination process according to the sixth example.

FIG. 13 is a flowchart showing reference voltage V _REF calculation processing according to the sixth embodiment.

14A is a change in drive voltage of a solenoid SOL _n changed from on to off, FIG. 14B is a change in drive voltage of a solenoid SOL _{n + 1} changed from on to off, and FIG.
Is the change in the drive voltage value of the taken-in solenoid SOL _n ,
(D) is a diagram showing changes in the drive voltage value of the taken-in solenoid SOL _{n + 1} , and (E) is a diagram showing changes in the value of V _REF of the reference voltage.

[Explanation of symbols]

 10 Braking device 30 Microprocessor 32 Solenoid drive unit SOL solenoid

Claims (5)

[Claims] 1. A plurality of driving units are connected to a switching unit to which a power source and an ON / OFF signal are supplied, and are driven and stopped by turning on / off the switching unit and turning on / off a driving voltage according to the state of the ON / OFF signal. An abnormality detecting device for detecting an abnormal state of an electric / electronic component, wherein each of the plurality of electric / electronic components is a drive voltage which is a voltage between each of the plurality of electric / electronic components and the switching means, Reference voltage calculation means for calculating the level of the reference voltage based on the level of at least one drive voltage, and a state for judging the state of the on / off signal supplied to each of the switching means connected to the plurality of electric / electronic components Judging means, driving voltage levels of a plurality of electric / electronic components, and each switch judged by the status judging means. Determining means for determining an abnormal state of each of the plurality of electric / electronic parts based on the state of the on / off signal supplied to the means for controlling and the level of the reference voltage calculated by the reference voltage calculating means. An abnormality detection device characterized by being provided. 2. The abnormality detection according to claim 1, wherein the reference voltage calculation means calculates the level of the reference voltage so that fluctuations of the drive voltage over time are averaged. apparatus. 3. The drive voltage of the electric / electronic component is electric
The electronic component further comprises a steady value determining means for determining whether or not the value is in a steady state, the reference voltage computing means is based on the drive voltage determined by the steady value determining means to be a value in the steady state. The abnormality detection device according to claim 1, wherein the level of the reference voltage is calculated. 4. The abnormality detection according to claim 3, wherein the steady-state value determining means determines that the drive voltage whose change in value over a predetermined time is less than or equal to a predetermined value is the value in the steady state. apparatus. 5. The steady value determining means determines that the drive voltage of an electric / electronic component which has been turned off or on for a predetermined time or more has a value in the steady state. Item 3. The abnormality detection device according to item 3.