LOAD CONTROL DEVICE

Abstract

Load control device (100) comprising the following: a control switch (61, 62) that switches on or off a current supplied by a power source (VB) to a load; a switching control circuit (20) which, based on a control instruction from an arithmetic device (10), sends a control signal to the control switch (61, 62); and a constant current source (40) that supplies current to the load without passing it through the control switch (61, 62), wherein the switching control circuit (20) performs a control such that it does not switch on the control switch (61, 62) if, in a state in which the control switch (61, 62) is switched off and in a state in which a current from the constant current source (40) is supplied to the load, a voltage between both ends of the load is equal to or less than a specified value, wherein the load control device (100) is characterized in that: The switching control circuit further performs a control such that the constant current source (40) switches on at a time when it does not perform an ON control on the control switch (61, 62).

Description

Technical field

[0001] The present invention relates to a load control device that controls a load, and relates in particular to a technique for protecting a circuit of the load control device. Technical background

[0002] As a circuit protection mechanism of a load control device, e.g. in an anomaly detection device of a fuel injector according to PTL 1, a technique is known in which a constant current source is provided on a downstream side of the fuel injector and an anomaly of the fuel injector is detected on the basis of a potential difference that is generated in a predetermined section of the circuit when a current is supplied to a circumferential area in which no fuel injection occurs.

[0003] Additionally, a fault diagnosis method for a fuel injection device and the device according to PTL 2 discloses a technique for detecting a fault in the fuel injection device by generating a constant current while the fuel injector is inactive and detecting a current value when the fuel injection device is activated. Furthermore, PTL 3 discloses a current driver circuit designed to improve the response characteristics when driving a capacitive load. For this purpose, the rate of change of the output voltage is detected. Based on this detection, an additional correction current is generated and superimposed on the main drive current to accelerate the achievement of a target current in the load. PTL 4 also discloses a drive circuit for an inductive load with an upper switch that is controlled via a bootstrap circuit.To ensure operation even with a decreasing supply voltage, the voltage is monitored. If the voltage falls below a threshold, a bias voltage in the bootstrap circuit is deliberately reduced to increase the charging voltage of the bootstrap capacitor. List of prior art patent literature PTL 1: JP H06 - 65 864 A PTL 2: JP H10 - 252 539 A PTL 3: US 8 427 222 B2 PTL 4: JP 2016 - 201 661 A Summary of the invention: Technical problem

[0004] However, if a short circuit fault occurs in the load (on the fuel injector side), performing normal control solely through diagnostics will excite a circuit that has no load-limited current and low resistance, causing excessive current to flow into the circuit, leading to circuit malfunction and, in the worst case, circuit burnout.

[0005] Furthermore, even if a procedure to prohibit the operation of the load control device is carried out, and the diagnosis based on the current value at the time of load control, according to conventional techniques, determines that the load is short-circuited, the load is in a short-circuit state and thus current is supplied to the load, which has a lower resistance compared to the load under normal conditions. Therefore, a large current flows through the load control device circuitry precisely during the period from when the diagnosis is confirmed until the operation of the load control device is prohibited.

[0006] For this reason, it is necessary to select a driver with absolute limit data that can withstand a large current flowing until the operation of the load control device is prohibited by performing excitation through normal control at the time of a load short circuit and using diagnostics, instead of a driver with absolute limit data that can withstand a current value used for normal load control.

[0007] In view of the circumstances described above, there was a need for a method that could prevent a large current from flowing when excitation is carried out by a normal load control system at the time of a load short circuit. Solution to the problem

[0008] The problem is solved by the features of the independent patent claims. Advantageous embodiments of the invention are described in the dependent claims.

[0009] A load control device according to a further aspect of the present invention comprises a control switch that switches on or off a current supplied to a load from a power source, a switching control circuit that sends a control signal to the control switch based on a control instruction from an arithmetic device, and a constant current source that supplies a current to the load without passing it through the control switches, wherein several different setpoints are configured as setpoints.Then, in a state where the control switch is off and a current is supplied to the load from the constant current source, the switching control circuit determines a range among ranges subdivided by the multiple determination values ​​in which a voltage is contained between both ends of the load, communicates a determination result to the arithmetic device, and the arithmetic device performs a control according to the determination result. Advantageous effects of the invention

[0010] According to at least one embodiment of the present invention, the short-circuit fault is diagnosed before the load control operation is carried out during the load short circuit, and the operation of the load control device is prohibited. Therefore, it is possible to prevent a large current from flowing when excitation is carried out by a normal load control system.

[0011] Tasks, configurations and effects beyond those described above will become clear through the explanation in the following embodiments. Brief description of the drawings [ Fig. 1] Fig. Figure 1 is a circuit diagram illustrating a configuration example of a load control device according to a first embodiment of the present invention. [ Fig. 2] Fig. Figure 2 is a timing diagram illustrating an actuation and a signal of each unit of the load control device according to the first embodiment of the present invention. [ Fig. 3] Fig. Figure 3 is a circuit diagram illustrating another configuration example of the load control device according to the first embodiment of the present invention. [ Fig. 4] Fig. Figure 4 is a circuit diagram illustrating a configuration example of a load control device according to a second embodiment of the present invention. [ Fig. 5] Fig. Figure 5 is a timing diagram illustrating an actuation and a signal of each unit of the load control device according to the second embodiment of the present invention. [ Fig. 6] Fig. Figure 6 is a flowchart illustrating a procedure example of a diagnosis and control of the load control device according to the second embodiment of the present invention. [ Fig. 7] Fig. Figure 7 is a circuit diagram illustrating a configuration example of a load control device according to a third embodiment of the present invention. [ Fig. 8] Fig. Figure 8 is a timing diagram illustrating an actuation and a signal of each unit of the load control device according to the third embodiment of the present invention. [ Fig. 9] Fig. Figure 9 is a circuit diagram illustrating a configuration example of a load control device according to a fourth embodiment of the present invention. Description of the embodiments

[0012] Examples of modes for carrying out the present invention are described below with reference to the accompanying drawings. In this specification and the accompanying drawings, components that have essentially the same function or configuration are designated by the same reference numerals, and redundant descriptions are omitted. <Erste Ausführungsform>

[0013] First, a configuration of a load control device according to a first embodiment of the present invention is described.

[0014] Fig. Figure 1 is a circuit diagram illustrating a configuration example of a load control device 100 according to the first embodiment. The load control device 100 comprises an electronic control device 1 and an injector circuit 90, which controls an injector 70 according to a control instruction from the electronic control device 1. The electronic control device 1 is, for example, an electronic control unit (ECU) that controls a control target device mounted on a passenger car. The injector 70 is a fuel injection device that directly injects fuel into a combustion chamber of an internal combustion engine and is an example of a load. The injector circuit 90 can be integrated into the electronic control device 1.

[0015] The electronic control device 1 contains an arithmetic device 10, a memory 11 and a driver circuit 20.

[0016] The arithmetic device 10 is, for example, a processor such as a central processing unit (CPU) or a microprocessor unit (MPU). The memory 11 is, for example, a semiconductor memory such as a ROM or RAM. The arithmetic device 10 reads a computer program stored in memory 11 and executes it to realize the function of the electronic control device 1, i.e., the load control device 100.

[0017] The driver circuit 20 (an example of a switching control circuit) contains a control unit 30, an internal constant current source 40 and a voltage monitoring circuit 50.

[0018] The control unit 30 controls the entire operation of the booster circuit 20 based on the control instruction issued by the arithmetic device 10. For example, the control unit 30 generates a control signal to be sent to a valve opening driver 62 and a holding driver 61, which are contained in the injector circuit 90, based on a control instruction from the arithmetic device 10. Additionally, the control unit 30 generates an instruction to control the excitation and de-excitation of the internal constant current source 40 based on the control signals to the valve opening driver 62 and the holding driver 61.

[0019] The internal constant current source 40 (an example of a constant current source) is connected to the upstream side of the injector 70 (the load), i.e., the source side of the valve opening driver 62 and the holding driver 61. The internal constant current source 40 generates a constant current to be supplied to the injector 70 from a voltage Vint obtained from any power source, according to an instruction from the control unit 30. For example, a reference voltage VB supplied by a battery (not illustrated) can be used as the voltage Vint. In the present embodiment, the constant current generated by the internal constant current source 40 is supplied to the injector 70 without passing through the valve opening driver 62 and the holding driver 61. It should be noted that the internal constant current source 40 can be located outside the pre-driver circuit 20.

[0020] The voltage monitoring circuit 50 is connected to both ends of the injector 70 (the excitation coil, which is in Fig. (as illustrated in Figure 1) is connected and detects and monitors a voltage (a voltage between both ends) applied to both ends of the injector 70. The voltage monitoring circuit 50 includes a differential voltage measuring device 51, a voltage comparison result calculation circuit 55, and a determination value table 56.

[0021] The differential voltage measuring device 51 measures a differential voltage (a monitoring voltage) corresponding to a voltage between both ends of the injector 70 and outputs a measurement result to the voltage comparison result calculation circuit 55.

[0022] The determination table 56 stores a voltage value as one of the determination values, which was predetermined as a comparison criterion for fault diagnosis. In the present embodiment, a predefined fixed value is stored in the determination table 56; however, since it is predicted that the resistance value will vary depending on the load to be controlled, a configuration is also conceivable in which the determination value in the determination table 56 can be freely changed.

[0023] The voltage comparison result calculation circuit 55 compares the determined value stored in the determined value table 56 with the differential voltage measured by the differential voltage measuring device 51 and determines the comparison result. The voltage comparison result calculation circuit 55 then outputs the determined result to the control unit 30 and controls the control unit 30 to activate the injector 70 according to the determined result.

[0024] The injector circuit 90 includes the hold driver 61 (the first control switch) which switches on or off a current supplied to the injector 70 from a power source (reference voltage VB) such as a battery (not illustrated), and the valve opening driver 62 (the second control switch) which switches on or off a current supplied to the injector 70 from a voltage booster circuit 63, which generates a high voltage (valve opening voltage VH) based on the voltage (reference voltage VB) of the power source. A switching element such as a metal-oxide-semiconductor field-effect transistor (MOSFET) is used as the hold driver 61 and the valve opening driver 62.

[0025] These control switches (the holding driver 61, the valve opening driver 62) are arranged on the upstream side of the load in the direction in which the current supplied to the load (the injector 70) from the power source (e.g., the battery with reference voltage VB) flows. This allows switching between excitation and non-excitation of the load located on the upstream side. Furthermore, an injector current monitoring resistor 80 is connected between the downstream side of the injector 70 and the ground terminal.

[0026] An actuation indicator device 150 is connected to the arithmetic device 10 of the electronic control device 1 via an input / output interface (not illustrated). The actuation indicator device 150 includes a display unit 151 and an actuation unit 152. Information indicating the status of the load control device 100 and output by the arithmetic device 10 is displayed on the display unit 151. For example, an indicator lamp (a warning light) or a liquid crystal display is used as the display unit 151. The actuation unit 152 generates an input signal according to a user actuation and outputs the input signal to the arithmetic device 10. The arithmetic device 10 performs a calculation and control according to the input signal. For example, the actuation indicator device 150 could be a portable data processing device (PC: personal computer) such as a tablet device.

[0027] It should be noted that the load control device 100 is a high-side control system that switches the power source side of the load (of the injector 70) on or off, but can be a low-side control system that switches the ground side of the load (of the injector 70) on or off.

[0028] Fig. Figure 2 is a timing diagram illustrating an actuation and signal of each unit of the load control device 100.

[0029] In the load control device 100, a control instruction signal (signal 101) is input from the arithmetic device 10 into the driver circuit 20 via a driver control instruction line 5. The driver circuit 20, which has received the control instruction signal, performs an ON control (signals 102 and 103) on the valve opening driver 62 and the holding driver 61 from the control unit 30 in order to switch on the injector 70 (the load).

[0030] The control instruction signal contains a valve opening current control signal and a holding current control signal. The valve opening current control signal is a signal for controlling a current applied to the excitation coil to open the injector 70. This corresponds, for example, to an INJ current represented by waveform 105 in Fig. 2 is specified, from the rise of the INJ current to the constant current value above the peak value. The holding current control signal is a signal for controlling a current applied to the excitation coil to maintain the valve opening state of injector 70 for a specified period. This corresponds to a constant current value of a lower value after the peak value of the INJ current, e.g., in the INJ current shown in waveform 105 of Fig. 2 is shown.

[0031] In the injector circuit 90, the current flowing to the injector 70 is monitored by the injector current monitoring resistor 80, which is connected to the downstream side of the injector 70. The driver circuit 20 controls the current supplied to the injector 70 based on the current detected by the injector current monitoring resistor 80.

[0032] The control unit 30 also controls the internal constant current source 40 and the voltage monitoring circuit 50, along with the valve opening driver 62 and the holding driver 61. When the control unit 30 switches on the internal constant current source 40 via the control line 41 for internal constant current sources (signal 104), the internal constant current source 40 switches on the injector 70. In the present embodiment, the internal constant current source 40 is switched on to switch on the injector 70 at a time when the control unit 30 is not performing ON control on the valve opening driver 62 and the holding driver 61 (a period other than a monitoring off-period T). Then, while the injector 70 is switched on by the internal constant current source 40, the voltage monitoring circuit 50 monitors the voltage between both ends of the injector 70 to perform fault diagnosis (also simply referred to as "diagnosis").

[0033] The internal constant current source 40 supplies a current to the injector 70 under the control of the control unit 30. The current supplied to the injector 70 by the internal constant current source 40 is a current that is smaller than the current (the current threshold Ith) that flows to the injector 70 when the injector 70 is activated, i.e., a weak current of such magnitude that the injector 70 does not open.

[0034] In the present embodiment, the injector 70 is considered a load, and the current output by the internal constant current source 40 is set to a low current to prevent the valve from opening. However, various loads, such as a motor, a relay, and a valve, are considered as a single load to be controlled. The low current is a current of such magnitude that these loads do not operate, and the value of the low current varies depending on the type and characteristics of the load to be controlled.

[0035] When the internal constant current source 40 is in the state switched on by the control unit 30, the voltage monitoring circuit 50 monitors the voltage applied to both ends of the injector 70 by the differential voltage measuring device 51.

[0036] The monitored voltage (waveform 106) obtained by the differential voltage measuring device 51 is output to the voltage comparison result calculation circuit 55 and compared with the determined value stored in the determined value table 56. Since the current flowing to injector 70 is constant due to the internal constant current source 40, the voltage between the two ends of injector 70 is determined by the resistance of injector 70 according to Ohm's law. Therefore, for example, if a short circuit occurs in injector 70, its resistance becomes significantly lower than before the fault, and the voltage between the two ends of injector 70 also becomes small relative to its resistance when the short circuit occurs.

[0037] Therefore, the target value (the voltage threshold Vth), stored in the target value table 56, is determined in advance based on the resistance value of the injector 70 at normal operating time and the constant current value of the internal constant current source 40. If the measurement result (the voltage between the two ends of the injector 70), obtained by the differential voltage measuring device 51, is equal to or less than the target value (the voltage threshold Vth) in the target value table 56, a low resistance value of the injector 70, i.e., an anomalous condition (e.g., a short-circuit fault), is assumed. Therefore, the voltage comparison result calculation circuit 55 outputs a load stop instruction (signal 107) to the control unit 30 via the load stop instruction line 21.Conversely, if the measurement result obtained by the differential voltage measuring device 51 is greater than the determined value (the voltage threshold Vth) in the determined value table 56, it is assumed that the resistance value of the injector 70 is large, i.e. normal.

[0038] The control unit 30, which has received the load stop instruction, prohibits the output of the ON control signal to the valve opening driver 62 and the holding driver 61. In other words, the control unit 30 performs an OFF control on the valve opening driver 62 and the holding driver 61. As a result, the valve opening driver 62 and the holding driver 61 are controlled in such a way that they are not switched on. (Voltage amplifier circuit)

[0039] In the present embodiment, it is assumed that the differential voltage obtained by the differential voltage measuring device 51 is directly output to the voltage comparison result calculation circuit 55. However, if the load resistance of the injector 70 is small or the current supplied by the internal constant current source 40 is weak, the value of the differential voltage obtained by the differential voltage measuring device 51 is very small, and there is a possibility that the determination cannot be carried out normally, depending on the resolution of the voltage comparison result calculation circuit 55. Therefore, as in Fig. As illustrated in Figure 3, a configuration is also conceivable in which a voltage amplifier circuit 52 for amplifying the differential voltage obtained by the differential voltage measuring device 51 is arranged between the differential voltage measuring device 51 and the voltage comparison result calculation circuit 55.

[0040] As described above, the load control device (the load control device 100) according to the first embodiment includes the control switch (the valve opening driver 62, the holding driver 61), which switches on or off the current supplied to the load (the injector 70) from the power source (e.g. the battery having the reference voltage VB), the switching control circuit (the driver circuit 20), which sends the control signal from the arithmetic device (the arithmetic device 10) to the control switch based on the control instruction (the signal 101), and the constant current source (the internal constant current source 40), which supplies the current to the load without passing it through the control switch.The switching control circuit is configured to perform a control to prevent the control switch from being turned on if, in a state where the control switch is off (for a period other than the monitoring prohibition period T) and in a state where current (waveform 105) is supplied to the load by the constant current source, the voltage between both ends of the load is equal to or less than the specified value (the voltage threshold Vth).

[0041] According to the load control device, which has the configuration described above according to the first embodiment, the short-circuit fault is diagnosed before the load control operation is carried out during the load short circuit, and the operation of the load control device is prohibited. Therefore, it is possible to prevent a large current from flowing when excitation is carried out by a normal load control.

[0042] This means that in the load control device 100 described above, during the OFF control of the valve opening driver 62 or the holding driver 61, the constant current is supplied to the injector 70 by the internal constant current source 40 of the booster circuit 20. The voltage monitoring circuit 50 of the booster circuit 20 then monitors the voltage between both ends of the injector 70 and compares the monitored voltage with the specified value in the specified value table 56 to determine the short-circuit fault of the injector 70.Here, if a short-circuit fault is present in the injector 70, the driver circuit 20 prohibits ON control of the valve opening driver 62 and the holding driver 61, such that it is possible to prevent a large current from flowing to the circuit in a state in which the injector 70 has a low resistance due to the short-circuit fault or the like by ON control of the valve opening driver 62 or the holding driver 61.

[0043] Therefore, if the injector 70 has a short-circuit fault, the valve opening driver 62 and the holding driver 61 perform an ON control such that it is possible to prevent anomalous heat generation of the circuit due to the flow of a large current and ultimately to prevent a fault of the circuit.

[0044] Additionally, since it is possible to prevent a large current from flowing until the operation of the load control device is prohibited by performing a diagnostic check after activation of the load control device, as is prohibited in related fields, it is possible to reduce the absolute limit values ​​of the driver used for control compared to related fields. Therefore, it is possible to choose a smaller and less expensive component than the driver.

[0045] Furthermore, the control unit 30 and the voltage monitoring circuit 50 of the driver circuit 20 are configured by hardware, and the control unit 30 performs the load stop control if the drive to the load is stopped, such that the load can be stopped faster than in the case where the arithmetic device 10 receives the comparison result of the monitored voltage and performs the load stop control.

[0046] In the present embodiment described above, the control switch includes the first control switch (the holding driver 61), which switches on or off the current (the waveform 105) supplied by the power source to the load (the coil of the injector 70), and the second control switch (the valve opening driver 62), which switches on or off the current (the waveform 105) supplied by the voltage boosting circuit (the voltage boosting circuit 63), which amplifies the voltage of the power source, to the load.Then the switching control circuit (the driver circuit 20) is configured to perform a control, not to turn on the first control switch and the second control switch, if in a state in which the first control switch and the second control switch are off, and in a state in which the current (the waveform 105) is supplied to the load by the constant current source, the voltage between both ends of the load is equal to or less than the specified value (the voltage threshold Vth).

[0047] According to the present embodiment, which has the configuration described above, it is possible to obtain the same operational effects as in the configuration described above, even when the load control device includes the first control switch and the second control switch, which are used to switch different currents on / off. That is, since the short-circuit fault is diagnosed and the operation of the load control device is prohibited before the load control operation is performed during the load short circuit, it is possible to prevent a large current from flowing when excitation is carried out by the normal load control operation.

[0048] In the present embodiment described above, the switching control circuit (the driver circuit 20) is configured to generate an instruction (a signal 104) to control excitation and non-excitation of the constant current source (the internal constant current source 40) based on a control signal for the control switch (the valve opening driver 62, the holding driver 61).

[0049] According to the configuration described above, excitation and non-excitation from the constant current source to the load are controlled during a period when the control signal (signals 102 and 103) for the control switch (the valve opening driver 62, the holding driver 61) is switched off. Therefore, it is possible to prevent a large current from flowing when excitation is performed by a normal load control circuit.

[0050] In the present embodiment described above, the constant current source (the internal constant current source 40) is configured to supply a current (a waveform 105) to the load when the load is not driven, which is smaller than a current (a current threshold Ith) that flows to the load when the load (the injector 70) is driven.

[0051] According to the configuration described above, during fault diagnosis, the current (waveform 105), which is smaller than the current (current threshold Ith) flowing to the load when the load (injector 70) is activated, is supplied to the load when the load is not activated. Therefore, it is possible to prevent the load from being activated, even though the load is not initially activated at the time of fault diagnosis.

[0052] In the present embodiment described above, the switching control circuit (the driver circuit 20) includes the control unit (the control unit 30) which generates the control signal of the control switch (of the valve opening driver 62, of the holding driver 61) based on the control instruction (of the signal 101), the constant current source (the internal constant current source 40) and the voltage monitoring circuit (the voltage monitoring circuit 50) which monitors the voltage between both ends of the load (of the injector 70) and determines whether the voltage between both ends of the load is equal to or less than the determined value (the voltage threshold Vth).When the voltage monitoring circuit, in a state where the control switch is off and current (waveform 105) is supplied to the load from the constant current source, determines that the voltage between both ends of the load is equal to or less than the determined value (the voltage threshold Vth), the control unit stops the load without sending the ON-state control signal to the load.

[0053] In the present embodiment described above, the switching control circuit (the driver circuit 20) is configured to be able to control the excitation and non-excitation of the constant current source (the internal constant current source 40) at any time within a period (a period other than the monitoring prohibition period T) in which the control switch (the valve opening driver 62, the holding driver 61) is switched off.

[0054] For example, in the load control device 100, which is in Fig. As illustrated in Figure 1, a diagnosis cannot always be performed immediately after the internal constant current source 40 has been switched on due to the influence of the inductance and capacitance components in the injector circuit 90. Therefore, it is desirable that the excitation and non-excitation of the constant current source (the internal constant current source 40) be recorded at any given time within a period (signals 102 and 103 of Fig. 2) can be controlled, with the control instruction (the valve opening driver 62, the holding driver 61) switched off. <Zweite Ausführungsform>

[0055] The load control device of a second embodiment differs from the load control device of the first embodiment in that the determination value table 56 has several determination values ​​and that a determination counter 57 is provided.

[0056] Fig. Figure 4 is a circuit diagram illustrating a configuration example of a load control device 100A according to the second embodiment. The load control device 100A has a configuration in which a determination counter 57, a comparison result transmission line 22, and a driver diagnostic information transmission line 6 are connected to the load control device 100, which is located in Fig. Figure 1 illustrates that the following must be added. That is, the driver circuit 20A in the electronic control device 1 includes the control unit 30, the internal constant current source 40, and a voltage monitoring circuit 50A. Fig. Section 4 describes the voltage boosting circuit 63, which is located in Fig. 1 is illustrated, omitted.

[0057] The voltage monitoring circuit 50A includes the differential voltage measuring device 51, the voltage amplifier circuit 52, and a voltage comparison result calculation circuit 55A. The voltage amplifier circuit 52 may be omitted depending on the magnitude of the input voltage. The voltage comparison result calculation circuit 55A includes the determination value table 56 and the determination counter 57.

[0058] The determination value table 56 allows the setting of several different determination values ​​(in Fig. 5 of the determination values ​​1, n and n+1) in accordance with an anomalous condition. Additionally, the user can actuate the actuating unit 152 to select a determination value (a fixed determination value) to disable the ON control of the valve opening driver 62 and the holding driver 61 from several determination values ​​that can be set in the determination value table 56. The arithmetic device 10 displays selectable determination values ​​on the display unit 151 of the actuating display device 150, and the user selects a suitable determination value (a fixed determination value) in accordance with the anomalous condition from the several determination values. In the determination value table 56, a defined number of times are recorded to determine the number of times during which the voltage between both ends of the injector 70 belongs to the specified range.

[0059] The voltage comparison result calculation circuit 55A determines the range within which the voltage value (differential voltage) between the two ends of the injector 70 (the load), obtained by the differential voltage measuring device 51, falls among the ranges subdivided by the multiple determination values ​​set in the determination value table 56. The determination result of the voltage comparison result calculation circuit 55A can then be sent to the arithmetic device 10 using the driver diagnostic information transmission line 6.

[0060] As described above, in the first embodiment, if the voltage comparison result calculation circuit 55A detects an anomalous state even once, the voltage comparison result calculation circuit 55A prohibits the load control of the control unit 30 of the driver circuit 20A. However, in an anomaly detection, even if an anomalous state is incorrectly detected only once due to unintentional external noise or the like, although no fault was initially present, the operation of the injector circuit 90 is stopped.

[0061] Additionally, the operation of the injector circuit 90 is stopped even in a case where it is not desired to stop the operation of the injector circuit 90, such as a case where the resistance value of the injector 70 is reduced due to aging of the injector 70 or the like, or a case where the resistance value of the injector 70 is reduced due to a minor fault of the injector 70 (to such an extent that a large current flows to the injector circuit 90 and a circuit fault due to anomalous heat generation does not occur).

[0062] Therefore, in the second embodiment, it is possible to count the number of times of the anomalous state by providing the determination counter 57 in the voltage monitoring circuit 50A. As shown in the flowchart of Fig. As illustrated in Figure 6, the load stop instruction to control unit 30 is only issued if the number of comparisons between the monitoring voltage and the determined value and the determination of an anomalous condition reach a defined number.

[0063] In the present embodiment, the defined number is assumed to be a predetermined value; however, a configuration is assumed in which the defined number is set to an arbitrary number. It should be noted that, as a method for counting by the determination counter 57, a method for starting the count when an anomalous state persists two or more times, and the like, in addition to a method for counting each determination that the state is anomalous, are conceivable.

[0064] It is also conceivable to have a configuration in which, after the anomalous state has been counted several times, the count is reset if the anomalous state is not counted for a certain period of time.

[0065] Fig. Figure 5 is a timing diagram illustrating an actuation and signal of each unit of the 100A load control device.

[0066] In the load control device 100A, a control instruction signal (a signal 101) is input from the arithmetic device 10 into the driver circuit 20. The driver circuit 20A, which has received the control instruction signal, performs an ON control (signals 102 and 103 in Fig. 2) at the valve opening driver 62 and the holding driver 61 from the control unit 30 to switch on the injector 70 (the load).

[0067] Here, when the internal constant current source 40 is switched on (signal 104) by the control unit 30, the voltage monitoring circuit 50A monitors the voltage applied to both ends of the injector 70 by the differential voltage measuring device 51. The monitored voltage (waveform 106) obtained by the differential voltage measuring device 51 is output to the voltage comparison result calculation circuit 55 and compared with the several determined values ​​1, n, and n+1 stored in the determined value table 56. For example, the monitoring voltage is considered anomalous if it is equal to or less than the determined value n.

[0068] In Fig. Since the value of the monitored voltage is greater than the target value n+1 when the internal constant current source 40 is first switched on, the voltage comparison result calculation circuit 55A outputs the comparison result "normal" to the target counter 57. Since the value of the monitored voltage is in the range between the target value 1 and the target value n when the internal constant current source 40 is switched on a second time, and is equal to or less than the target value n, the voltage comparison result calculation circuit 55A outputs the comparison result "anomalous" to the target counter 57.

[0069] The determination counter 57 counts the number of times the voltage comparison result calculation circuit 55A determines that the monitored voltage belongs to a predefined range (e.g., anomalous condition) among ranges subdivided by several determination values. Therefore, as in Fig. As illustrated in Figure 5, the determining counter 57 does not count when it receives the first comparison result “normal” (count value “m”), and counts the value from “m” to “m+1” when it receives the second comparison result “anomalous”.

[0070] Then, the voltage monitoring circuit 50A sends the determination result of the voltage comparison result calculation circuit 55A to the arithmetic device 10 each time using the driver diagnostic information transmission line 6.

[0071] Fig. Figure 6 is a flowchart illustrating a procedure example of a diagnosis and control of the load control device 100A.

[0072] First, the voltage comparison result calculation circuit 55A of the voltage monitoring circuit 50A compares the voltage (the monitored voltage) between both ends of the injector 70 with the several determined values ​​and calculates a comparison result (S1).

[0073] Next, the voltage comparison result calculation circuit 55A determines from the comparison result whether the monitored voltage is equal to or less than the specified setpoint (S2). The specified setpoint is a setpoint that, among several possible setpoints, prohibits the ON control of the valve opening driver 62 and the holding driver 61 and corresponds to the setpoint n in the example described above. If the monitored voltage is not equal to or less than the specified setpoint (NO in S2), the voltage comparison result calculation circuit 55A continues the load control without issuing a load stop instruction to the control unit 30 (S3).

[0074] On the other hand, if the monitoring voltage is equal to or less than the specified determination value (JA in S2), the voltage comparison result calculation circuit 55A counts the number of times in which the monitoring voltage, counted by the determination counter 57, is equal to or less than the determination value (S4).

[0075] Next, the voltage comparison result calculation circuit 55A determines whether the number of times the monitored voltage was equal to or less than the set value has reached the defined number (S5). If the number of times the monitored voltage was equal to or less than the set value has not reached the defined number (NO in S5), the voltage comparison result calculation circuit 55A continues the load control without issuing a load stop instruction to the control unit 30 (S6).

[0076] In parallel with the processing of steps S3 and S6, the determination result (the range to which the monitored voltage belongs, the count value of the determination counter 57) of the voltage comparison result calculation circuit 55A can be communicated to the arithmetic device 10 using the driver diagnostic information transmission line 6. The arithmetic device 10 outputs the determination result to the display unit 151.

[0077] On the other hand, when the number of times the monitored voltage was equal to or less than the set value reaches the defined number (YES in S5), the voltage comparison result calculation circuit 55A issues a load stop instruction via a load stop instruction line 21 to the control unit 30 (S7). After processing step S3, S6, or S7, the process returns to step S1 and a processing sequence is repeated.

[0078] It should be noted that in the example that is in Fig. 4 to Fig. Figure 6 illustrates that the voltage comparison result calculation circuit 55A has a configuration in which several determination values ​​are set in the determination value table 56, and a configuration that includes the determination counter 57, but may have a configuration that contains only one of them.

[0079] As described above, in the load control device (the load control device 100A) according to the second embodiment, the several different setpoint values ​​(the setpoint values ​​1, n and n+1) are set as the setpoint values, and the switching control circuit (the driver circuit 20A) is configured to perform a control in order not to turn on the control switch (the valve opening driver 62, the holding driver 61) in a state in which the control switch (the valve opening driver 62, the holding driver 61) is off and in a state in which a current from the constant current source (the internal constant current source 40) is supplied to the load (the injector 70), if a voltage between both ends of the load belongs to a predetermined range (e.g. a specified setpoint value or less) among ranges subdivided by the several setpoint values.

[0080] According to the load control device, which has the configuration described above according to the second embodiment, the short-circuit fault is diagnosed, as in the first embodiment, before the load control operation is carried out during the load short circuit, and the operation of the load control device is prohibited. Therefore, it is possible to prevent a large current from flowing when excitation is carried out by a normal load control. Furthermore, according to the present embodiment, several setpoint values ​​are provided, which can be arbitrarily set in accordance with an anomalous condition, and it is determined whether a voltage between both ends of the load belongs to a predetermined range (an anomalous condition) among ranges subdivided by the several setpoint values. Thus, for example,Then, if a large current flows to the load (the injector circuit 90) and the resistance value of the load decreases to such an extent that a circuit fault due to anomalous heat generation does not occur, it is possible to avoid a sudden stop in the control of the load (a motor or the like of a passenger car).

[0081] Additionally, in the load control device (the load control device 100A) according to the second embodiment, the several different setpoint values ​​(the setpoint values ​​1, n and n+1) are set as the setpoint values, and the switching control circuit (the driver circuit 20A) is configured in a state in which the control switch (the valve opening driver 62, the holding driver 61) is switched off, and in a state in which a current from the constant current source (the internal constant current source 40) is supplied to the load (the injector 70), the control switch is not switched on if a voltage between both ends of the load belongs to a predetermined range (e.g. a specified setpoint value or less) among ranges subdivided by the several setpoint values, and if the number of times in which the voltage between both ends of the load belongs to the predetermined range reaches a predetermined defined number.

[0082] According to the load control device, which has the configuration described above in the second embodiment, the short-circuit fault is diagnosed, as in the first embodiment, before the load control operation is carried out during the load short circuit, and the operation of the load control device is prohibited. Therefore, it is possible to prevent a large current from flowing when excitation is carried out by a normal load control.Furthermore, according to the present embodiment, similar to the configuration described above, by taking several determination values ​​and determining whether a voltage between both ends of the load belongs to a predetermined range (an anomalous state) among ranges subdivided by the several determination values, it is possible to avoid a sudden stop of the control of the load (a motor or the like of a passenger car) when the resistance value of the load decreases to such an extent that a circuit fault due to anomalous heat generation does not occur.

[0083] Furthermore, according to the present embodiment, an anomaly is determined by counting the number of times the voltage between both ends of the load belongs to a predetermined range. This prevents an erroneous detection of an anomalous state due to external noise or the like, even with a small number of occurrences, such as a single occurrence. Therefore, it is possible to prevent an emergency stop of the load (a power machine or similar, such as a passenger vehicle) due to an erroneous detection of an anomalous state caused by unexpected external noise or the like.

[0084] In addition, the load control device (the load control device 100A) according to the second embodiment includes the control switch (the valve opening driver 62, the holding driver 61), which switches on or off the current supplied by the power source (e.g. the battery having the reference voltage VB) to the load (the coil of the injector 70), the switching control circuit (the driver circuit 20), which sends the control signal from the arithmetic device (the arithmetic device 10) to the control switch based on the control instruction (the signal 101), and the constant current source (the internal constant current source 40), which supplies the current to the load without passing it through the control switch, and the several different setpoints (the setpoints 1, n and n+1) are set as the setpoints.Then the switching control circuit (the driver circuit 20A) determines whether the voltage between both ends of the load, in a state where the control switch (the valve opening driver 62, the holding driver 61) is off and in a state where current from the constant current source (the internal constant current source 40) is supplied to the load (the injector 70), is within a predetermined range (e.g., a specified value or less) among the ranges subdivided by the multiple values, and communicates the determination result to the arithmetic device (the arithmetic device 10), and the arithmetic device is configured to perform control according to the determination result.

[0085] In the present embodiment described above, the arithmetic device (the arithmetic device 10) is configured to control the output of a control instruction to turn on the control switch (of the valve opening driver 62, of the holding driver 61) to the switching control circuit (of the driver circuit 20A) or to control the output of a warning according to the determination result.

[0086] According to the load control device, which has the configuration described above in the present embodiment, the short-circuit fault is diagnosed, as in the first embodiment, before the load control operation is carried out during the load short circuit, and the operation of the load control device is prohibited. Therefore, it is possible to prevent a large current from flowing when excitation is carried out by a normal load control.

[0087] Furthermore, according to the present embodiment, similar to the configuration described above, several determination values ​​are provided, and it is determined whether the voltage between both ends of the load is within a predetermined range (an anomalous state) among the ranges subdivided by the several determination values. The result of this determination is communicated to the arithmetic device. As a result, it is possible to continue driving the load without determining the fault, depending on the degree of the determination result, or, if necessary, to inform the driver of the fault condition via the display unit 151 (a warning light or the like in the passenger car), giving the driver time to move the passenger car to a safe location and prompting a repair shop, such as a dealer, to repair the passenger car.

[0088] For example, the settings can be configured such that the load is stopped if the voltage between both ends of the load is equal to or less than the setpoint 1; a warning (continuation of load operation) is issued if the voltage between both ends of the load is in a range between setpoint 1 and setpoint n; a warning (continuation of load operation) is issued if the voltage between both ends of the load is in a range between setpoint n and setpoint n+1; and the voltage between both ends of the load is determined to be normal if it is greater than setpoint n+1. The arithmetic device 10 performs load control, a caution / warning output, or the like based on these setpoints.

[0089] In the first embodiment, the load control device can be 100 ( Fig. 1) The driver diagnostic information transmission line 6 contains the driver circuit 20 (the switching control circuit), and the driver circuit 20 (the switching control circuit) can be configured to notify the arithmetic device 10 that the voltage between both ends of the injector 70 is equal to or less than the set value. That is to say, in Fig. 1. The monitoring result (the short-circuit anomaly of the load) of the voltage monitoring circuit 50 is sent from the driver circuit 20 to the arithmetic device 10 via the driver diagnostic information transmission line 6 and is output to the display unit 151. As a result, the driver of the passenger car can, for example, understand that the cause of the engine stoppage is the short-circuit anomaly of the load. <Dritte Ausführungsform>

[0090] A third embodiment has a configuration in which a control switch is provided on the downstream side of the injector 70 with respect to the load control device 100 according to the first embodiment.

[0091] Fig. Figure 7 is a circuit diagram illustrating a configuration example of a load control device 100B according to the third embodiment.

[0092] In the injector circuit 90 ( Fig. 1) According to the first embodiment, it is possible to supply a constant current to the injector 70 by switching on the internal constant current source 40, since there is no path for interrupting the current on the downstream side of the injector 70. However, in the third embodiment, an injector circuit 90B includes a control switch (an excitation / non-excitation switching driver 64) which is arranged on a downstream side of the load in the direction in which the current supplied to the load (the injector 70) from the power source (e.g., the battery with the reference voltage VB) flows. Fig. 7 The excitation / non-excitation switching driver 64 is connected between the coil of the injector 70 and the injector current monitoring resistor 80 on its downstream side. As a result, excitation / non-excitation of the load on the downstream side of the load can be switched on.

[0093] During fault diagnosis, the constant current supplied by the internal constant current source 40 is switched off by the excitation / non-excitation switching driver 64, since the control of the valve opening driver 62, the holding driver 61, and the excitation / non-excitation switching driver 64 are all performed during the OFF control sequence. Therefore, compared to the first embodiment, in the load control device 100B according to the present embodiment, an internal switch 45 and a control line 46 for internal switches are added to the downstream side of the injector 70. The internal constant current source 40 is switched on, and simultaneously, the internal switch 45 is switched on via the control line 46 for internal switches. A switching element, such as a MOSFET, is used for the excitation / non-excitation switching driver 64 and the internal switch 45.

[0094] As described above, a pre-driver circuit 20B includes the diagnostic switch (the internal switch 45), which is located on a downstream side of the load (the injector 70) and supplies current from the constant current source (the internal constant current source 40) to the load by being switched on in a state where the downstream control switch (the excitation / non-excitation switching driver 64) is off. As a result, even when the downstream control switch (the excitation / non-excitation switching driver 64) is in the OFF position, current from the constant current source to the load can be switched on.

[0095] Fig. Figure 8 is a timing diagram illustrating an actuation and signal of each unit of the load control device according to the third embodiment. Fig. 8 are the control signal (signal 111) of the excitation / non-excitation switching driver 64 and the instruction signal (signal 112) of the internal switch 45 for the timing diagram of Fig. 2 has been added and the load stop instruction (signal 107) has been omitted.

[0096] As in Fig. As illustrated in Figure 8, during the ON control of the control instruction issued by the arithmetic device 10, the control signal supplied by the control unit 30 to the excitation / non-excitation switching driver 64 is also in the ON control state (signal 111). The internal switch 45 is switched on by the control unit 30 via the control line 46 for internal switches at the same time as the internal constant current source 40 is switched on (signal 112). The remaining steps are the same as in the timing diagram of Figure 8. Fig. 2.

[0097] As described above, the load control device (the load control device 200B) according to the third embodiment comprises as the control switch the upstream control switch (the valve opening driver 62, the holding driver 61), which is arranged on the upstream side with respect to the load, and the downstream control switch (the excitation / non-excitation switching driver 64), which is arranged on a downstream side of the load in the direction in which the current supplied to the load from the power source (the injector 70) flows, and further comprises the diagnostic switch (the internal switch 45), which supplies the current from the constant current source (the internal constant current source 40) to the load by being switched on in a state in which the upstream control switch and the downstream control switch are switched off.

[0098] In addition, in the present embodiment, the switching control circuit (the driver circuit 20B) performs a control operation such that it does not switch on the upstream control switch and the downstream control switch, or either the upstream control switch or the downstream control switch, if the voltage between both ends of the load is equal to or less than the specified value, in order to supply the current from the constant current source (the internal constant current source 40) to the load (the injector 70). This control is performed in a state in which the upstream control switch (the valve opening driver 62, the holding driver 61) and the downstream control switch (the excitation / non-excitation switching driver 64) are switched off, and in a state in which the diagnostic switch (the internal switch 45) is switched on.

[0099] The load control device according to the present embodiment, which has the configuration described above, can supply current from the constant current source to the load without routing it through the upstream and downstream control switches by incorporating the diagnostic switch itself into the configuration that includes the downstream control switch, which is located on the downstream side of the load. Therefore, the same operational effects as those of the first and second embodiments can be obtained in the present embodiment. That is, since the short-circuit fault is diagnosed and the operation of the load control device is prohibited before the load control operation is performed during the load short circuit, it is possible to prevent a large current from flowing when excitation is carried out by the normal load control operation.

[0100] In Fig. In the first case, the internal constant current source 40 is located on the upstream side of the injector 70, and the internal switch 45 is located on the downstream side of the injector 70. However, the internal switch 45 can be located on the upstream side of the injector 70, and the internal constant current source 40 can be located on the downstream side of the injector 70.

[0101] In addition, instead of arranging the internal switch 45 on the downstream side of the injector 70, a configuration is also conceivable in which only the excitation / non-excitation switching driver 64 is in the ON control, while the valve opening driver 62 and the holding driver 61 are in the OFF control in order to switch on the injector 70 with the current of the internal constant current source 40. <Vierte Ausführungsform>

[0102] A fourth embodiment is a configuration in which, instead of the injector 70 in the load control device 100B according to the third embodiment, several injectors are provided as one load.

[0103] Fig. Figure 9 is a circuit diagram illustrating a configuration example of a load control device 100C according to the fourth embodiment.

[0104] In an injector circuit 90C of the load control device 100C, the injector 70 is in Fig. Injector 7 is replaced by injectors 70a and 70b. Therefore, injector circuit 90C has a configuration in which excitation / non-excitation switching drivers 64a and 64b and injector current monitoring resistors 80a and 80b are provided for injectors 70a and 70b, respectively. Additionally, a pre-driver circuit 20C, corresponding to the configuration of injector circuit 90C, is equipped with internal switches 45a and 45b and control lines 46a and 46b for internal switches.

[0105] In the present embodiment, the load connected to the downstream side of the valve opening driver 62 and the holding driver 61 are two injectors, one of injector 70a and the other of injector 70b. However, a configuration in which more than two (n+1) loads are connected is also conceivable. In this case, the internal switch 45, the control line 46 for internal switches, the injector current monitoring resistor 80, and the excitation / non-excitation switching driver 64 are similarly configured by (n+1) switches.

[0106] Furthermore, in the present embodiment, the control line 46 for internal switches is configured individually each time the number of internal switches 45 increases to 1, 2, ..., n+1; however, the present invention is not limited to this example. For example, a configuration is also conceivable in which several internal switches 45 are controlled simultaneously by a control line for internal switches with respect to the several internal switches 45.

[0107] As described above, in the load control device (the load control device 200C) according to the fourth embodiment, the load is configured by a first load (an injector 70a) on the downstream side of the control switch (the valve opening driver 62, the holding driver 61) and a second load (an injector 70b) arranged parallel to the first load in the direction in which the current supplied to the load from the power source flows, and includes a first downstream control switch (an excitation / non-excitation switching driver 64a) located on a downstream side of the first load, and a second downstream control switch (an excitation / non-excitation switching driver 64b) located on a downstream side of the second load.

[0108] In addition, in the present embodiment, the switching control circuit (the driver circuit 20C) performs a control such that it does not switch on either the first downstream control switch or the second downstream control switch when, in a state in which the control switch (the valve opening driver 62, the holding driver 61), the first downstream control switch (the excitation / non-excitation switching driver 64a) and the second downstream control switch (the excitation / non-excitation switching driver 64b) are switched off, and in a state in which current is supplied from the constant current source (the internal constant current source 40) to the first load (the injector 70a) or the second load (the injector 70b), the voltage between both ends of the first load or the second load is equal to or less than the specified value.

[0109] Even in a configuration where the load control device according to the present embodiment, which has the configuration described above, includes several downstream control switches arranged on a downstream side of each load corresponding to multiple (e.g., two) loads, it is possible to supply current from the constant current source to the load by controlling one upstream control switch (the valve opening driver 62, the holding driver 61) and the multiple downstream control switches on / off, without the current passing through each control switch. Therefore, the same operational effects as those of the first to third embodiments can be obtained in the present embodiment.This means that before the load control is carried out at the time of a short circuit of any load among the multiple loads, the short circuit fault is diagnosed in order to prohibit the operation of the load control device, in such a way that it is possible to prevent a large current from flowing at the time of excitation by a normal load control.

[0110] In addition, the present embodiment includes the following: a first downstream diagnostic switch (an internal switch 45a) located on a downstream side of the first load (the injector 70a) which supplies a current from the constant current source (the internal constant current source 40) of the first load by being switched on in a state in which the first downstream control switch (the excitation / non-excitation switching driver 64a) is switched off;and a second downstream diagnostic switch (an internal switch 45b) located on a downstream side of the second load (the injector 70b) which supplies a current in a direction in which a current supplied from the power source to the load flows from the constant current source (the internal constant current source 40) of the second load by being switched on in a state in which the second downstream control switch (the excitation / non-excitation switching driver 64b) is off.

[0111] Even in a configuration where the load control device according to the present embodiment, which has the configuration described above, includes several downstream control switches arranged on a downstream side of each load corresponding to multiple (e.g., two) loads, it is possible to supply current from the constant current source to the load by including the first and second diagnostic switches, without it passing through the upstream control switch (the valve opening driver 62, the holding driver 61) and the multiple downstream control switches. Therefore, the same operational effects can be obtained in the present embodiment as in the first to third embodiments.This means that before the load control operation is carried out at the time of a short circuit of any load among the multiple loads, the short circuit fault is diagnosed in order to prohibit the operation of the load control device, in such a way that it is possible to prevent a large current from flowing at the time of excitation by a normal load control operation.

[0112] The load control device 100C according to the present embodiment, which is in Fig.As illustrated in Figure 9, the injector circuit 90C contains only one set of drivers located on the upstream side of the load, namely the valve opening driver 62 and the holding driver 61. The load is configured by multiple loads (the injectors 70a and 70b). The load control device 100C includes the excitation / non-excitation switching drivers 64a and 64b, the injector current monitoring resistors 80a and 80b, and the internal switches 45a and 45b for each of the multiple injectors 70a and 70b. As a result, the constant current from the internal constant current source 40 can be supplied to each of the injectors 70a and 70b individually, and fault diagnosis can be performed for each of the injectors 70a and 70b individually. <weitere>

[0113] Furthermore, the present invention is not limited to each of the embodiments described above, and it is self-evident that various other application examples and modifications can be made without deviating from the main content of the present invention as described in the claims.

[0114] For example, the embodiments described above describe the configuration of the load control device precisely and specifically to aid in understanding the present invention and are not necessarily limited to those containing all the components described. Additionally, part of the configuration of one embodiment can be replaced by a component of another embodiment. Furthermore, components of other embodiments can be added to the configuration of one embodiment. It is also possible to replace or delete further components for part of the configuration of each embodiment.

[0115] Additionally, some or all of the configurations, functions, and processing units can be implemented in hardware, such as an integrated circuit. A field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), or the like can be used as the hardware. Furthermore, each of the components, functions, and the like described above can be implemented by software using a processor (e.g., a CPU, as used in Arithmetic Device 10) contained in a computer, which interprets and executes a program to implement each function. Information, such as a program, a table, and a file for implementing each function, can be stored in a recording device, such as a semiconductor memory (e.g., Memory 11), a hard disk and solid-state drive (SSD), or a recording medium, such as...It can be stored on an IC card, an SD card, and an optical disc.

[0116] Furthermore, in the embodiments described above, only control lines and data lines deemed necessary for explanation are illustrated; however, not all control lines and data lines for a product are shown. In practice, virtually all components can be considered interconnected. Reference symbol list 1 Electronic Control Unit (ECU) 5 Driver control instruction line 6 Driver diagnostic information transmission line 10 Arithmetic device 11 storage 20, 20A driver circuit 21 Load stop instruction line 22 Comparison result transmission line 30 control unit 40 Internal constant current source 41 Control line for internal constant current sources 45 Internal switch 46 Control lines for internal switches 50, 50A voltage monitoring circuit 51 Differential voltage measuring device 52 Voltage amplifier circuit 55, 55A Voltage comparison result calculation circuit 56 Determination value table 57 Determination counter 61 Holding drivers 62 Valve opening drivers 63 Voltage boosting circuit 64 Excitation / Non-excitation switching drivers 70, 70a, 70b Injector 80, 80a, 80b Injector current monitoring resistor (resistance) 90, 90B, 90C injector circuit 100, 100A to 100C load control device 150 Actuation indicator device 151 Display unit 152 Actuating unit< / weitere>

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