WO1999056139A1

WO1999056139A1 - Apparatus for detecting trouble with solenoid-operated device

Info

Publication number: WO1999056139A1
Application number: PCT/JP1999/001753
Authority: WO
Inventors: Tetsuo Muraji
Original assignee: Mikuni Corporation
Priority date: 1998-04-28
Filing date: 1999-04-02
Publication date: 1999-11-04
Also published as: JPH11311651A; EP0995997A1; EP0995997A4

Abstract

An apparatus for detecting troubles with a solenoid-operated device that includes two current paths consisting of two pairs of series switches (10, 20, 30, 40) and an electromagnetic coil (1) connected between the intermediate nodes (2, 4) of the pairs. The existence of a trouble with the solenoid-operated device is decided based both on the state of operation of the switch pair and on the magnitude of the voltage signal corresponding to the sum of a first voltage signal (VP) and a second voltage signal (VN) corresponding, respectively, to potentials at the intermediate nodes (2, 4).

Description

Description Failure determination device for electromagnetic coil operating device

The present invention relates to a failure determining device for an electromagnetic coil operating device comprising an electromagnetic coil.

Background art

The direction of the power supply current supplied to the electromagnetic coil is changed in the forward or reverse direction.The device shown in Fig. 1 is known as a device for determining the failure of the electromagnetic coil operating device. I'm afraid. This device has a fault (hereinafter referred to as a ground fault) in which the connection line of the electromagnetic coil operation device and the ground wire are short-circuited, and the connection line of the electromagnetic coil operation device and the power supply line. This is a device to protect the electromagnetic coil operating device or prevent electric leakage to the outside of the device by judging a fault (hereinafter referred to as a short-to-power fault) in which the and are short-circuited.

A power supply line of a power supply (not shown) is connected to FETs 10 and 30 which are switching elements via resistors 62 and 63. The operational amplifier element 61 is connected to the connection line between the resistor 62 and the FET 10 and the connection line between the resistor 63 and the FET 30. FETs 10 and 30 are connected to FETs 20 and 40, respectively. Both ends of the electromagnetic coil 1 are connected to a connection line between the FET 10 and the FET 20 and a connection line between the FET 30 and the FET 40, respectively. FET 2 0 The FET 40 and the FET 40 are grounded via a resistor 72 and connected to the operational amplifier 71.

By the switching operation of the FETs 10, 20, 30, and 40 described above, the direction of the current supplied from the power supply to the electromagnetic coil 1 and the stop of the power supply are controlled. It is. Further, a supply current detection circuit 60 is composed of the operational amplifier element 61 and the resistors 62 and 63, and the supply current detection circuit 60 has a voltage generated by the resistors 62 and 63. The value of the current supplied to the FETs 10 and 30 is detected from the drop. Further, the operational amplifier element 71 and the resistor 72 constitute an overcurrent detection circuit 70, and the supercharging current detection circuit 70 detects the FET 20 and the FET 20 from the voltage drop generated by the resistor 72. And the value of the current passing through 40.

However, the device shown in FIG. 1 requires two detection circuits, that is, a supply current detection circuit 60 and an overcurrent detection circuit 70, and also requires a detection circuit. An inconvenience has arisen that the program for determining the failure of the electromagnetic coil operating device from the current value detected by the circuit is complicated. In addition, due to the heat generated by the resistors 62, 63, and 72 provided for current detection, half of the CPU, FET, etc. installed near these resistors As the temperature of the conductor elements rises and these elements are liable to malfunction, there is also a problem that it is not possible to properly supply current to the electromagnetic coil. I did. Furthermore, since the signal supplied to the operational amplifying element of the current detection circuit is a very small signal, it is easily affected by noise, and the noise occurs. Is There was also the inconvenience that it was easy to misidentify a malfunction in the electromagnetic coil operating device.

The present invention has been made in view of the above points, and its purpose is to reduce the cost and to appropriately supply a current to an electromagnetic coil. An object of the present invention is to provide a failure determination device for an electromagnetic coil operating device capable of accurately determining a failure of the electromagnetic coil operating device while supplying the failure.

Disclosure of invention

The electromagnetic coil operating device according to the present invention is provided with a fault detecting device which comprises two current paths each comprising a switch pair connected in series with each other. An electromagnetic coil connected between the connection points of each of the switch pairs, a drive circuit for selectively operating the switches, and power supplies at both ends of both the current paths. A power supply means for applying a voltage via a supply line and a ground line, and a failure determination device for the electromagnetic coil operating device, comprising: Voltage detecting means for detecting each potential and generating a first voltage signal and a second voltage signal corresponding to the potential; and detecting a value of the first voltage signal and a value of the second voltage signal. An adding means for generating an added voltage signal according to the added value, and an operation state of the switch pair Said electromagnetic Coil failure determining means you determine the failure of the Le operation device based on the value of the sum voltage signal, that has features and this pressurized et ing.

In other words, according to the features of the present invention, the cost can be reduced, the current can be appropriately supplied to the power supply coil, and the target can be appropriately reduced. The failure of the electromagnetic coil operating device can be determined with certainty.

Brief description of the drawings

FIG. 1 is a circuit diagram showing a conventional failure determination device for an electromagnetic coil operating device.

FIG. 2 is a circuit diagram showing a failure determining device for an electromagnetic coil operating device according to the present invention.

FIG. 3 is a circuit diagram showing the operation of the electromagnetic coil operating device in the on mode.

FIG. 4 is a circuit diagram showing the operation of the electromagnetic coil operating device in the off mode.

Figure 5 is a flow chart showing a subroutine that determines a ground fault.

Fig. 6 is a flow chart showing a subroutine for determining a short-to-power fault.

Figure 7 is a timing chart showing the changes in voltage and current in an experiment in which a ground fault occurred.

Fig. 8 is a timing chart showing changes in voltage and current in an experiment in which a short-to-supply fault was generated.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a failure judging device for an electromagnetic coil operating device according to the present invention. Note that the same reference numerals are given to components corresponding to the components shown in FIG. Supply voltage V _B is to via the power supply line VL, the scan I pitch in g elements, Ru is supplied to the FET 1 0 and 3 0 In example embodiment. The switching elements 10 and 30 are connected to switching elements, for example, FETs 20 and 40, respectively, and the switching elements 20 and 40 are connected to the switching elements 20 and 40, respectively. Connected to ground GND via ground line G. Both ends of the electromagnetic coil 1 are connected to a connection line between the switching element 10 and the switching element 20 and to the switching element 30 and the switching element. It is connected to each of the connection lines to the element 40. Further, at a connection point 2 of a connection line between the switching element 10 and the switching element 20, a resistor 3 is connected, and the switching element is connected. At a connection point 4 of a connection line between 30 and the switching element 40, a resistor 5 is connected. And have you below, your only that voltage value to the connection point 2 and referred as V p, that your only that voltage value to the connection point 4 is referred to as V _N. After being connected at the connection point 6, the resistors 3 and 5 are connected to the engine control unit 50 via a resistor 7 for changing the voltage to a predetermined value. It is connected to the A / D converter 51. In the case where the resistance value of the resistor 3 and 5 of this was the same resistance value, you only that voltage value at the connection point 6 than ing and response Ji value to the sum of the V _P and V _N Oh . The AZD converter 51 converts the supplied signal into a digital signal, and supplies the digital signal to the input / output node 52. The input / output node 52 is configured so that a data signal or an address signal is input / output to the CPU 53. The input / output node 52 includes ROM 54, RAM 55, and switching elements 10, 20, 30 and 30. The drive circuit group 56 connected to the drive circuit group 56 for driving 40 controls the switching elements 10, 20, 30, and 40. Connected to signal input terminal. Further, the R〇M 54 is a program for determining the failure of the electromagnetic coil operating device according to the flowchart described in FIGS. 5 and 6. Is memorized.

As described above, the current path is constituted by the switching elements 10 and 20 or the switching elements 30 and 40 and the connection lines thereof, and An electromagnetic coil operating device is composed of the switching elements 10, 20, 30, and 40 and the electromagnetic coil 1, and a drive circuit is composed of the drive circuit group 56. A power supply means is constituted by a power supply not shown, and a voltage detection means is constituted by a connection line between the connection point 2 and the resistance 3 and a connection line between the connection point 4 and the resistance 5. The resistors 3 and 5 constitute an adding means, and the AZD converter 51, the input / output noise 52, the CPU 53, the ROM 54, and the RAM 55 constitute a determining means.

In the following, the state in which the switching elements 10 and 30 are opened and the switching elements 20 and 40 are connected is described in an off mode. A state in which the switching elements 20 and 30 are opened and the switching elements 10 and 40 are connected or the switching elements A state in which the switching elements 10 and 40 are open and the switching elements 20 and 30 are connected is called an on mode. In the following description, the switching elements 20 and 30 are opened and the switching element 10 is opened. And 40 are connected. The switching between the on-mode and the off-mode is performed by switching the switching element 1 in response to the above-mentioned instruction signal issued from the CPU 53. 0, 20, 30, and 40 are driven by being driven. In addition, the value of the input resistance of the A / D converter 51 is large, and the value of the current supplied to the A / D converter 51 is negligible. Furthermore, the resistors 12, 22, 32, and 42 in FIGS. 3 and 4, which will be described later, correspond to the switching elements 10, 20, 30, and 40, respectively. , For example, on-resistance, each having the same resistance value. A short-circuit fault between the connection line of the electromagnetic coil operation device and GND is called a ground fault, and a short-circuit fault between the connection line of the electromagnetic coil operation device and the power supply line is called a short-to-power fault. .

FIG. 3 shows the operation of the electromagnetic coil operating device in the on-mode. Note that the same reference numerals are given to the components corresponding to the components shown in FIG.

In this state, the power supply current from the power supply is supplied to the electromagnetic coil 1 via the on / off switch 11 of the switching element 10 and the resistor 12. After that, the current flows to GND via the on-off switch 41 of the switching element 40 and the resistor 42. At this time, V p is lower than the power supply voltage V _{B by the} voltage V 12 across the resistor 12, and V _N is only the voltage V 42 across the resistor 42 and the ground potential. Will also be higher. When the electromagnetic coil operating device is in a favorable condition, the current flowing through resistors 12 and 42 is Flow is due but Ru Oh the same, the resistance 1 2 and Ri Do rather equally and 4 2 of the inter-end voltage V 12 and V 42, the sum of V _P and V _N rather equally and V _B It becomes.

On the other hand, if a ground fault occurs and a current flows through the switching element 10 due to the ground fault, for example, the connection line force between the switching elements 10 and 20 When short-circuited to GND, the current flowing through the resistor 12 of the switching element 10 increases, and the voltage V across the resistor 12 is increased. , ₂ Ri is Do not rather come large,禾卩of the V p and V Ru Oh than that also Do small Ku Ri by V _B. And follow, and the sum of the V _P and V _N, Ki out and this you determined that the difference between the V _B is ground fault in the period that the One, large-Installing by a predetermined value V _D occurs It is. The predetermined value V _D of this is, Ru Oh in by Ri constant order was value in the pre-Me experiment.

FIG. 4 shows the operation of the electromagnetic coil operating device in the off mode. The same reference numerals are given to the components corresponding to the components shown in FIGS. 2 and 3.

When switching from on-mode to off-mode, current flows through the inductance of electromagnetic coil 1 and this current is On / off switch of the switching element 20, the resistance 22 of the switching element 20, the on-off switch 21, the electromagnetic coil 1, and the switching element 40. It flows through the circuit to GND via 41 and resistor 42. At this time, V _p is lower than the ground potential only by the voltage V 22 across the resistor 22, and V _N is higher than the ground potential only by the voltage V 42 across the resistor 42. Become . When the electromagnetic coil actuating device is in a favorable condition, the current flowing through resistors 22 and 42 is Flow is due but Ru Oh the same, the resistance 2 2 and 4 the absolute value of the voltage V _{2 2} and V _{4 2} between two ends is Ri and Do rather equal, the sum of V _P and V _N is 0 and It becomes.

On the other hand, if a short-to-supply fault occurs and a current due to the short-to-power flows through the switching element 40, for example, the connection line between the switching elements 30 and 40 Is short-circuited with the power supply line, the current flowing through the resistor 42 of the switching element 40 becomes large, so that the voltage between the both ends of the resistor 42 becomes large. voltage V _{4 2} is Ri Do not rather come large, the sum of the V _P and V _N is Ru Oh than even than 0 that Do not rather than can large. And follow, the sum of the V p and V _N is Ru Oh than that Ki out and this you determined to heaven絡故disabilities has occurred in the period and was Tsu large door name Ri by the predetermined value V u. This predetermined value V _ί; is a value determined by a preliminary experiment.

In the following, the starting process such as the initialization of the variables used in the CPU 53 is completed, and the electromagnetic coil operating device performs a predetermined constant operation, for example, as described above. It is assumed that the on-mode and the off-mode are repeated at a constant period.

Figure 5 shows a subroutine that determines a ground fault.

First, it is determined whether or not the electromagnetic coil operating device is in the on mode (step S11). If it is determined that the mode is not the on-mode, the subroutine is terminated immediately. On the other hand, if it is determined that the Ru Oh in the on-mode is, V ρ, you detect the _V Ν and V Β _(scan STEP S 1 2). In the next _{doctor, V Β - (V ρ +} V Ν) is you judged whether or not we can large Ri by the predetermined value V _D (scan STEP S 1 3). V _B — (V p + V _N ) is less than V _D Ends this subroutine. On the other hand, if it is determined that V _B — (V p + V _N ) is larger than V _D , it is determined that the electromagnetic coil operating device has a ground fault, and the ground fault processing is performed. For example, the switching elements 10, 20, 30, and 40 are opened to stop the power supply to the electromagnetic coil operating device (step S 14), and the subroutine is opened. End the session. As described above, a ground fault is determined during on-mode.

Figure 6 shows a subroutine that determines a short-to-power fault.

First, it is determined whether or not the electromagnetic coil operating device is in an off-mode (step S21). If it is determined that the mode is not the off-mode, the subroutine is terminated immediately. On the other hand, if it is determine by the Ru Oh in the off mode is, that issue detects the V _P and V _N (the scan STEP S 2 2). Then, Vp + _VN is a predetermined value

Judge whether it is larger than V (Step S2 3) V

If it is determined that + V _N is less than V u, the subroutine is terminated. On the other hand, if the V p + V _N is determined to have come large Ri by V u, the electromagnetic co-Yi Le operating system discriminated line physicians the power supply fault failure treatment and failed power supply fault (scan STEP S 24), this subroutine ends. As described above, in the off-mode, the short-to-power fault is determined.

如described above rather, Ki out and this you determine the failure of the electromagnetic co-Yi Le operating system Ri by the sum of the V _P and V _N and the each separately determined without and also V p and V _N Therefore, in the device described in FIG. 2, the number of input terminals to be used for the A / D converter 51 is reduced. In addition to being able to do so, it is also possible to reduce the computation time in the CPU 53.

Figure 7 shows the changes in voltage and current in an experiment that caused a ground fault.

When one cycle consisting of one on-mode and one off-mode described above is repeatedly executed in a cycle of 1 ms. to come with the current generated by Tsu good flows in the electromagnetic Coil Le operating system, the value of that only you when you first Nmo over de V p + V _N is RuゝLes decreased Ri by V _b this And are shown. In this experimental example, if it is determined that v _B — (V p + V _N ) is larger than the predetermined value V _D twice consecutively, a ground fault occurs. It is determined that the power supply to the electromagnetic coil operating device has been stopped.

Figure 8 shows the changes in voltage and current in an experiment that caused a short-to-supply fault.

As shown in Fig. 7, when one cycle consisting of one on-mode and one off-mode is executed at the cycle of lms, it is caused by short-to-power. of a tree and the current flows in the electromagnetic Coil Le operating system, the value of that only us when off mode one de V p + V _N has and the child you are rising Ri by ground potential shows Is If the consecutive V _P + V _N 2 times is determined to have come atmospheric Ri by Ji predetermined value V is determined that the power supply fault failure occurs, the experimental examples is shown in Figure 7 Similarly, the power supply to the electromagnetic coil operating device has been stopped.

The electromagnetic coil operating device and the failure determining device of the electromagnetic coil operating device as described above are connected to an electromagnetic actuator for driving a driven member. When the electromagnetic coil is used for the control device of the present invention, the electromagnetic coil is not used as a magnetomotive force source for driving the magnetic member for driving the driven member, and the electromagnetic coil operating device is not used for the electromagnetic coil operating device. While the current supplied to the coil is controlled, the failure determination device determines the failure of the electromagnetic coil operating device, so that the reliability of the electromagnetic actuator can be improved. It can be done.

Also, in order to further enhance the reliability of the electromagnetic actuating unit, a device in which two electromagnetic coil operating devices are provided in the electromagnetic actuating unit. In this case, the failure determination device according to the present invention may be installed in each electromagnetic coil operating device. With this configuration, when it is determined that one of the electromagnetic coil operating devices has failed, the other electromagnetic coil operating device has an electromagnetic actuator. It is possible to drive the air conditioner, and the cost is higher than when a failure determination device according to the prior art is installed in each of two electromagnetic coil operation devices. It can be greatly reduced.

In the above-described embodiment, the addition means constituted by the two resistors 3 and 5 is shown. However, an analog addition circuit such as an operational amplification element is used as the addition means. It is clear that you can use it.

Industrial applicability

As described above, according to the failure determination device for the electromagnetic coil operating device according to the present invention, the cost can be reduced, and the number of resistors serving as a heat generating source can be reduced. As a result, the temperature rise of the semiconductor By adopting a configuration that can suppress the current, it is possible to appropriately supply current to the power coil, and at the same time, it is possible to accurately control the electromagnetic coil operating device. Failure can be determined.

Claims

The scope of the claims

1. Two current paths each consisting of a switch pair connected in series with each other, and an electromagnetic coil connected between the connection points of each pair of the switch pairs. A drive circuit for selectively operating the switch, and power supply means for applying a voltage to both ends of the current path via a power supply line and a ground line. This is a failure determination device for such an electromagnetic coil operating device.

Voltage detecting means for detecting each potential at the connection point of each pair, and generating a first voltage signal and a second voltage signal corresponding to the potential;

Adding means for generating an added voltage signal corresponding to a value obtained by adding the value of the first voltage signal and the value of the second voltage signal;

Failure determination means for determining a failure of the electromagnetic coil operating device based on an operation state of the switch pair and a value of the added voltage signal. Failure determination device for coil operation device.

2. The failure determination means is configured such that at least one of the switch pairs is in an open state and power is not supplied to the electromagnetic coil. When the value of the added voltage signal is larger than a first predetermined value, it is determined that a short-to-power fault occurs in which the electromagnetic coil and the power supply line are short-circuited. In operation, when one of the switch pairs is in a connected state and power is being supplied to the electromagnetic coil, the power is supplied to the electromagnetic coil. When the difference between the value of the calculated voltage signal and the value of the power supply voltage is larger than a second predetermined value, it is determined that a ground fault has occurred in which the electromagnetic coil and the ground wire are short-circuited. 2. The failure determining device for an electromagnetic coil operating device according to claim 1, wherein at least one of the second determining operation and the second determining operation is performed.

3. The electromagnetic coil operation according to claim 1, wherein the addition means divides the first voltage signal and the second voltage signal to generate the added voltage signal. Device failure determination device.