JP4134719B2 - Power supply system shutdown control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply system mounted on a vehicle, and more particularly, to a technology for opening a power supply system with no arc and a technology for determining one failure from a plurality of failures related to signal lines of the power supply system.
[0002]
[Prior art]
A battery such as 12V or 24V is mounted on the vehicle as a power source for supplying power to the auxiliary machine. In recent years, vehicles such as so-called hybrid vehicles or electric vehicles that take out driving force from an electric motor are gradually becoming popular, and electronic control of vehicles has been further advanced, so that higher voltage (for example, 36V) is used. Battery) has come to be installed.
[0003]
When a high-voltage power supply can be used in this way, the auxiliary machine can be driven more optimally, while the need for safety functions in preparation for abnormalities in the electric circuit (for example, disconnection, short circuit, etc.) is also increasing. . For example, a function for preventing damage to equipment due to a high voltage current or a function for interrupting an electric circuit without generating an electric arc is further required.
[0004]
Japanese Patent Laid-Open No. 10-271603 (Patent Document 1) discloses an electric vehicle having a function of preventing damage to a battery due to overcurrent and damage to an electronic device due to excessive power generation at the time of circuit interruption as such a safety function. To do. In this electric vehicle, a travel motor, a battery that supplies power to the travel motor, a control circuit that controls conversion of power between the travel motor and the battery, a breaker, and an overcurrent are detected An output circuit that outputs a signal, a circuit that stops driving the driving motor and the regenerative output from the driving motor to the battery when the signal is output, and a control that controls the breaker so as to cut off the overcurrent supply Circuit.
[0005]
According to this electric vehicle, when an overcurrent is detected due to an abnormality in the electronic device during traveling, driving of the traveling motor and regeneration with respect to the battery are stopped. Since the breaker is shut off after the regeneration is stopped, overcurrent does not flow to the electronic device, and generation of a voltage without a discharge destination can be prevented. This prevents battery damage and electronic equipment damage.
[0006]
[Patent Document 1]
JP-A-10-271603
[0007]
[Problems to be solved by the invention]
However, according to the electric vehicle disclosed in Patent Document 1, since there is only one electric circuit to be cut off, there is a problem that it cannot be applied as it is when there are two or more electric circuits.
[0008]
That is, when a plurality of electric circuits share a power source, an electronic device and a breaker are connected to each electric circuit. Since each electronic device is controlled by each control device, each control device shuts off each breaker when an abnormality occurs. However, since the interruptions are controlled separately, the interruption timings are not aligned. As a result, there is a problem that it is impossible to execute so-called arc-free opening that interrupts the circuit without generating an electric arc due to a high voltage.
[0009]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a shut-off control method capable of performing arc-free opening in a power supply system in which a plurality of electric circuits share a power supply, and the power supply thereof. A fault determination method capable of determining a fault related to a signal line of a system is provided.
[0010]
[Means for Solving the Problems]
The shutoff control method according to the first invention is a detection step for detecting an abnormality relating to the power supply system, a stop step for stopping the supply of power from the generator when an abnormality is detected, and an abnormality is detected. A command step for instructing the electronic device to shut down the circuit of the electronic device, an execution step for executing the cutoff of the circuit of the electronic device, the supply of power is stopped, and the circuit of the electronic device is shut off, An opening step for performing the opening of the circuit breaker.
[0011]
According to the first invention, the cutoff control method controls the cutoff of the power supply system mounted on the vehicle. The power supply system includes a power supply, a circuit breaker, a generator, and an electronic device. The power source is a battery of 12V, 24V, 36V, for example. The circuit breaker is, for example, a main relay that controls connection and release between a power source and an electric circuit. The generator is, for example, a motor generator. The electronic device is, for example, an air conditioner inverter or an electric power steering system. When an abnormality related to the power supply system is detected in the detection step, the supply of power from the generator is stopped in the stop step. For example, power generation is stopped. Alternatively, the connection between the generator and the power supply system is interrupted. When the abnormality is detected, the electronic device is instructed to shut down the circuit of the electronic device in the command step, and the shutdown is executed in the execution step. When the supply of electric power is stopped and the circuit of the electronic device is shut off, the circuit breaker is opened in the opening step. If it does in this way, supply of the electric power from a generator will be stopped by opening a circuit breaker, Therefore An unnecessary voltage does not generate | occur | produce in a power supply system. In addition, since the circuit of the electronic device is interrupted before the circuit breaker is opened, the current is prevented from flowing into the electronic device in the event of an abnormality. Therefore, the power supply system including a plurality of circuit breakers (that is, the circuit breaker and the circuit breaker in the electronic device) is opened without generating an arc. Thereby, the interruption | blocking control method which can perform an arc-free open | release in the power supply system with which a some electric circuit shares a power supply can be provided.
[0012]
The shutoff control method according to the second invention controls shutoff of a power supply system including a high voltage power supply in addition to the configuration of the first invention.
[0013]
According to the second invention, the arc-free opening can be executed in the power supply system in which the plurality of electric circuits share the high voltage power supply.
[0014]
The shutoff control method according to the third invention controls the shutoff of the power supply system including the air conditioner inverter in addition to the configuration of the first or second invention.
[0015]
According to the third aspect of the present invention, in the power supply system in which the power source is shared by a plurality of electric circuits and one of the electric circuits includes the air conditioner inverter, the arc-free opening can be executed.
[0016]
According to a fourth aspect of the present invention, there is provided a failure determination method comprising: a detection step for detecting an abnormality relating to the power supply system; a command step for instructing the circuit breaker of the electronic device to be shut down when the abnormality is detected; The controller receives a signal from the first controller, a detection step for detecting the state of the electronic device based on the received signal, a recognition step for recognizing the state of the electronic device, and And a failure determination step of determining one failure from a plurality of failures related to the signal line based on the state and the recognized state.
[0017]
According to the fourth invention, the failure determination method determines a failure (for example, short circuit, disconnection, etc.) related to the signal line of the power supply system mounted on the vehicle. The power supply system includes a generator (for example, a motor generator), an electronic device (for example, an air conditioner inverter, an electric power steering device and other devices), a first control device for controlling the generator, and a second for controlling the electronic device. Including the control device. When an abnormality relating to the power supply system is detected in the detection step of the failure determination method, the first control device instructs the circuit of the electronic device to be cut off in the command step. In the reception step, the second control device receives a signal output from the first control device to the electronic device. In the detection step, the second control device detects the state of the electronic device based on the signal. In the recognition step, the second control device recognizes the state of the electronic device based on the signal received from the electronic device. The detected state or recognized state is, for example, a state where a circuit of an electronic device is connected or a state where the circuit is cut off. In the failure determination step, the second control device determines one failure from a plurality of failures based on the detected state and the recognized state. For example, if these states are inconsistent (that is, different from each other), it is determined that the signal line is a fault that is short-circuited to the ground. If these states match (that is, indicate the same state), the signal line is determined to be another failure. In this way, a failure related to the signal line connecting the first control device and the electronic device by comparing the state of the electronic device detected based on the signal from the first control device and the signal from the electronic device. Can be determined. Accordingly, it is possible to provide a failure determination method capable of determining a failure related to a signal line in a power supply system in which a plurality of power supply circuits share a power supply.
[0018]
In the failure determination method according to the fifth invention, in addition to the configuration of the fourth invention, in the failure determination step, the first signal line is grounded when the detected state and the recognized state are inconsistent. Determining that the fault is a short circuit.
[0019]
According to the fifth invention, the failure determination method is a failure in which the first signal line is grounded and short-circuited in the power supply system in which the reliability of the first signal line is lower than the reliability of the second signal line. judge. Here, the first signal line is a cable that connects the first control device and the electronic device, for example, a copper wire. The second signal line is a wire harness that connects the electronic device and the second control device, for example, capable of serial communication. In such a power supply system, when the detected state and the recognized state are inconsistent, it is determined in the failure determination step that the first signal line is a failure that is shorted to the ground. In this way, a failure relating to the signal line of the power supply system can be determined.
[0020]
In the failure determination method according to the sixth aspect of the invention, in addition to the configuration of the fourth invention, the failure determination step is a failure in which the first signal line is short-circuited to ground when the detected state and the recognized state are matched. And a step of determining that the failure is different.
[0021]
According to the sixth aspect of the present invention, the failure determination method provides a failure different from a failure in which the first signal line is grounded short-circuited in a power supply system in which the reliability of the first signal line is lower than the reliability of the second signal line. judge. Here, the first signal line is a cable that connects the first control device and the electronic device, for example, a copper wire. The second signal line is a wire harness that connects the electronic device and the second control device, for example, capable of serial communication. In such a power supply system, when the detected state and the recognized state match, the failure determination step causes the first signal line to be different from a failure that is short-circuited to the ground (for example, a failure that is disconnected or a failure of the power supply system). It is determined that the failure is a short circuit to the power supply. In this way, a failure relating to the signal line of the power supply system can be determined.
[0022]
In the failure determination method according to the seventh aspect of the invention, in addition to the configuration of the sixth aspect of the invention, the determination step determines one of a failure in which the first signal line is short-circuited to the power supply and a failure in which the first signal line is disconnected. Including the steps of:
[0023]
According to the seventh aspect, it is possible to determine either a failure in which the first signal line is disconnected or a failure in which the first signal line is short-circuited to the power supply of the power supply system.
[0024]
The failure determination method according to the eighth invention determines a failure in a power supply system including a high-voltage power supply in addition to the configuration of any of the fourth to seventh inventions.
[0025]
According to the eighth aspect, in the power supply system including a high voltage power supply, it is possible to determine a failure related to the signal line.
[0026]
The failure determination method according to the ninth invention determines a failure in the power supply system including the air conditioner inverter in addition to the configuration of any one of the fourth to seventh inventions.
[0027]
According to the ninth aspect, in the power supply system including the air conditioner inverter, it is possible to determine a failure relating to the signal line connecting the air conditioner inverter and the first control device.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
[0029]
<First Embodiment>
With reference to FIG. 1, a power supply system 1000 in which the cutoff control method according to the first embodiment of the present invention is used will be described. The power supply system 1000 is mounted on a so-called hybrid vehicle that generates driving force by an engine and a motor.
[0030]
As shown in FIG. 1, a power supply system 1000 includes an HV_ECU (Hybrid Vehicle_Electronic Control Unit) 100, an SMR (System Main Relay) 120, a motor generator inverter (hereinafter “motor generator” is referred to as MG) 130, and a first MG 140. , Second MG 142, high voltage power supply 160, low voltage power supply 170, AC inverter 200, and AC (Air Conditioner) _ECU 400. High voltage power supply 160 is, for example, a 36V battery. The low voltage power supply 170 is, for example, a 12V battery.
[0031]
The HV_ECU 100 is connected to the MG inverter 130 via the signal line 102. The HV_ECU 100 is connected to the AC inverter 200 via the signal line 104. The HV_ECU 100 is connected to a controller (not shown) of the SMR 120 via the signal line 110. AC_ECU 400 is connected to AC inverter 200 via signal line 106. AC_ECU 400 is connected to HV_ECU 100 via signal line 108. Here, the signal line 106 and the signal line 108 are signal lines (for example, wire harnesses) that can perform multiplex communication (for example, serial communication) in a vehicle and have high reliability of data communication. With such a signal line, the power supply system 1000 can be saved and an enormous amount of signals can be accurately transmitted.
[0032]
The HV_ECU 100 is grounded via a first IG (Ignition) 180. AC_ECU 400 is grounded via second IG 190.
[0033]
High voltage power supply 160 supplies power to MG inverter 130 and AC inverter 200 via SMR 120. The low voltage power supply 170 supplies power to the HV_ECU 100, the AC_ECU 400, and other electronic devices (not shown). The low voltage power supply 170 is charged with a low voltage current obtained by a dedicated generator (not shown) or by stepping down a high voltage current from the high voltage power supply 160 with a converter (not shown).
[0034]
SMR 120 connects and disconnects electrical circuits including high voltage power supply 160. This connection and disconnection is performed based on a command from the HV_ECU 100 received via the signal line 110.
[0035]
The MG inverter 130 converts the direct current from the high voltage power supply 160 into a predetermined alternating current, and supplies the current to the first MG 140 and the second MG 142. MG inverter 130 is controlled based on a command from HV_ECU 100 received via signal line 102.
[0036]
The AC inverter 200 converts a direct current from the high voltage power supply 160 into a predetermined alternating current and supplies the current to the AC drive motor 150. AC inverter 200 is controlled based on either a command from HV_ECU 100 received via signal line 104 or a command from AC_ECU 400 received via signal line 106.
[0037]
First MG 140 and second MG 142 generate or increase a driving force (torque) when a predetermined condition is satisfied. For example, when an acceleration request by the driver of the vehicle is detected, the first MG 140 and the second MG 142 increase the torque, and the vehicle accelerates. First MG 140 and second MG 142 generate electricity by regenerative braking when the vehicle is decelerating. When the electric power generated in this way is supplied to the high voltage power supply 160 via the MG inverter 130, the high voltage power supply 160 is charged.
[0038]
The AC drive motor 150 generates power by the alternating current supplied from the AC inverter 200, and drives a vehicle air conditioner, a so-called air conditioner compressor (not shown).
[0039]
With reference to FIG. 2, a configuration of AC inverter 200 according to the present embodiment will be described. As shown in FIG. 2, the AC inverter 200 includes a CPU (Central Processing Unit) 210, a signal input unit 220, a signal output unit 230, an inverter unit 240, and a cutoff circuit 250. The CPU 210 includes a control circuit 212 and a logical operation circuit 214.
[0040]
A control signal from the signal input unit 220 is input to the CPU 210. This control signal is an instruction signal for AC_ECU 400 to change the operation of AC drive motor 150, an AC_ECU 400 circuit interruption instruction signal for AC inverter 200, an HV_ECU 100 circuit interruption instruction signal for AC inverter 200, and the like. Based on these signals, the control circuit 212 controls another circuit in the AC inverter 200 described later or the AC drive motor 150. The logical operation circuit 214 performs a predetermined logical operation based on the input signal. This logical operation includes calculation of logical sum.
[0041]
Signals input from the HV_ECU 100 and the AC_ECU 400 are input to the signal input unit 220. The signal output unit 230 is connected to the AC_ECU 400 via the signal line 106 and outputs a control signal from the CPU 210.
[0042]
The inverter unit 240 converts the direct current supplied from the high voltage power supply 160 into an alternating current, and supplies the alternating current to the AC drive motor 150. The shut-off circuit 250 shuts off the internal circuit of the AC inverter 200 based on the control signal from the control circuit 212.
[0043]
With reference to FIG. 3, a control structure of a program that realizes the shutoff control method according to the present embodiment will be described based on a flowchart.
[0044]
In step (hereinafter “step” is represented as S) 302, HV_ECU 100 detects an abnormality in power supply system 1000. This detection is performed based on signals from sensors (not shown) provided in each part of the power supply system 1000. The detected abnormality includes, for example, disconnection or short circuit of the signal line in the power supply system 1000, excessive discharge from the first MG 140 or the second MG 142, and the like.
[0045]
In S304, HV_ECU 100 commands MG inverter 130 to stop first MG 140 and second MG 142. Thereby, the supply of the alternating current to the first MG 140 and the second MG 142 is stopped, and these MGs are stopped. Further, when the first MG 140 or the second MG 142 is generating power, the high voltage power supply 160 is not charged.
[0046]
In S <b> 306, HV_ECU 100 commands stop of AC inverter 200. This command is transmitted to the AC inverter 200 via the signal line 104 and also transmitted to the AC_ECU 400 via the signal line 108. As a result, AC_ECU 400 can synchronize the data relating to the state of AC inverter 200 held therein with the data represented by the output command from HV_ECU 100.
[0047]
In S308, CPU 210 of AC inverter 200 causes cutoff circuit 250 to execute cutoff based on a command from HV_ECU 100. Thereby, the circuit inside AC inverter 200 is interrupted. As a result, the supply of alternating current to the AC drive motor 150 is stopped, and the AC drive motor 150 is stopped.
[0048]
In S310, HV_ECU 100 commands to shut off SMR 120. That is, a signal for opening the SMR 120 is transmitted to a controller (not shown) of the SMR 120, and the SMR 120 is shut off.
[0049]
An operation of power supply system 1000 using the shutoff control method according to the present embodiment based on the above structure and flowchart will be described.
[0050]
When an abnormality is detected in power supply system 1000 (S302), HV_ECU 100 outputs a command to stop first MG 140 and second MG 142 to MG inverter 130 (S304). As a result, driving of first MG 140 and second MG 142 is stopped, and power generation by these MGs is not performed.
[0051]
When the HV_ECU 100 commands the AC inverter 200 to be shut off (S306), the CPU 210 of the AC inverter 200 executes the shut-off by the shut-off circuit 250 (S308). As a result, the connection between the high voltage power supply 160 and the AC drive motor 150 is cut off.
[0052]
When the HV_ECU 100 commands to shut off the SMR 120 (S310), the SMR 120 is opened by a controller (not shown). At the time of opening, since power generation by the first MG 140 and the second MG 142 is not performed, the SMR 120 is opened without an arc.
[0053]
As described above, according to the shutoff control method according to the present embodiment, when an abnormality is detected in power supply system 1000, HV_ECU 100 shuts off the circuit inside MG inverter 130 and the circuit inside AC inverter 200. Later, the SMR 120 is opened. In this way, even if a plurality of electric circuits sharing a power source (that is, a circuit including the AC inverter 200 and a circuit including the MG inverter 130) are controlled by separate control devices (that is, AC_ECU 400, HV_ECU 100), The SMR 120 can be opened without generating the above. Thereby, the interruption | blocking control method which can perform an arc-free open | release in the power supply system with which a some electric circuit shares a power supply can be provided.
[0054]
<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described. Note that the power supply system in which the failure determination method according to the present embodiment is used has the same hardware configuration as the power supply system 1000 (FIG. 1) according to the first embodiment described above. Their functions are the same. Therefore, detailed description thereof will not be repeated here.
[0055]
With reference to FIG. 4, the configuration of AC_ECU 400 in which the failure determination method according to the present embodiment is used will be described. As shown in FIG. 4, AC_ECU 400 includes an input circuit 410, a recognition circuit 420, a detection circuit 430, a determination circuit 440, and an output circuit 450.
[0056]
The input circuit 410 is connected to the signal lines 106 and 108 shown in FIG. A signal from the input circuit 410 is input to the recognition circuit 420 and the detection circuit 430. Signals from the recognition circuit 420 and the detection circuit 430 are input to the determination circuit 440. A signal from the determination circuit is input to the output circuit 450. The output circuit 450 is connected to a signal line (not shown) to a memory (not shown) included in the vehicle fault diagnosis system.
[0057]
With reference to FIG. 5, a control structure of a program for realizing the failure determination method according to the present embodiment will be described based on a flowchart.
[0058]
In S502, AC_ECU 400 receives a signal from HV_ECU 100. This signal includes a command signal. Here, the command signal is a signal for controlling AC inverter 200 transmitted from HV_ECU 100 to AC inverter 200. This command signal includes a command to shut off the circuit of the AC inverter 200.
[0059]
In S504, AC_ECU 400 detects the state of AC inverter 200 based on the signal received in S502 (hereinafter, this detected state is referred to as “state A”). This state includes a state where the circuit of the AC inverter 200 is connected or a state where the circuit is open.
[0060]
In S506, AC_ECU 400 receives a signal from AC inverter 200. This signal includes a signal representing the state of AC inverter 200. This state includes a state where the circuit of the AC inverter 200 is connected or opened, a value of current or voltage in the AC inverter 200, and the like.
[0061]
In S508, AC_ECU 400 recognizes the state of AC inverter 200 based on the signal received in S506 (hereinafter, the recognized state is referred to as “state B”).
[0062]
In S510, AC_ECU 400 determines whether or not state A and state B are inconsistent. This determination is made based on whether or not the data representing state A and the data representing state B are inconsistent (that is, when these data are inconsistent, state A and state B are inconsistent. It is judged that there is.) When state A and state B are inconsistent (YES in S510), the process proceeds to S512. If not (NO in S510), the process proceeds to S514.
[0063]
In S512, AC_ECU 400 determines that the signal line 104 is a failure that causes a GND (Ground) short (that is, a ground short).
[0064]
In S514, AC_ECU 400 determines that there is another failure. Other failures include disconnection, power supply short circuit, and the like.
[0065]
In S516, AC_ECU 400 outputs the determination result. This output destination is, for example, a memory (not shown) included in the failure diagnosis system or a warning light (not shown) provided on the dashboard of the driver's seat.
[0066]
An operation of the power supply system using the failure determination method according to the present embodiment based on the above structure and flowchart will be described.
[0067]
When the AC_ECU 400 receives a signal from the HV_ECU 100 during traveling of the vehicle (S502), based on the command signal output from the HV_ECU 100 to the AC inverter 200 included in the signal, the state of the AC inverter 200 (state A) Is detected (S504). When AC_ECU 400 receives a signal from AC inverter 200 (S506), AC_ECU 400 recognizes the state of AC inverter 200 (state B) based on the signal (S508).
[0068]
When detected state A and recognized state B are inconsistent (YES in S510), AC_ECU 400 determines that the signal line 104 is in failure due to GND short (S512). Thereafter, the determination result is output (S516), and necessary treatment is prompted.
[0069]
As described above, according to the failure determination method according to the present embodiment, the states of AC inverter 200 (that is, state A and state B) acquired based on the signals from the two control devices (that is, HV_ECU 100 and AC inverter 200). ) Is detected, it can be determined whether or not the signal line 104 connecting the HV_ECU 100 and the AC inverter 200 has a GND short-circuit failure. In this way, it is possible to determine a failure relating to the signal line 104 provided between the HV_ECU 100 and the AC inverter 200 in order to open the SMR 120 with no arc. Thereby, the failure determination method which can determine the failure in the power supply system which performs arcless open | release can be provided.
[0070]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a power supply system in which a cutoff control method according to a first embodiment of the present invention and a failure determination method according to a second embodiment are used.
FIG. 2 is a block diagram showing a configuration of an AC inverter according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing a control structure of a program that realizes the shutoff control method according to the first embodiment of the present invention.
FIG. 4 is a block diagram showing a configuration of an AC_ECU in which a failure determination method according to a second embodiment of the present invention is used.
FIG. 5 is a flowchart showing a control structure of a program for realizing a failure determination method according to a second embodiment of the present invention.
[Explanation of symbols]
100 HV_ECU, 102, 104, 106, 108, 110 signal line, 120 SMR, 130 MG inverter, 140 first MG, 142 second MG, 150 AC drive motor, 160 high voltage power supply, 170 low voltage power supply, 180 1st IG, 190 2nd IG, 200 AC inverter, 210 CPU, 400 AC_ECU, 1000 Power supply system.

Claims (3)

A shut-off control method for controlling shut-off of a power system mounted on a vehicle, wherein the power system includes a power source, a generator, an electronic device connected in parallel to the generator with respect to the power source, and A circuit breaker for cutting off power supply from the power source to the generator and the electronic device, a first control device for controlling the generator, and a second control device for controlling the electronic device ,
The shutoff control method includes:
A detection step in which the first control device detects an abnormality relating to the power supply system;
When the abnormality is detected, the first control device generates a stop command for stopping the operation of the generator and outputs it to the generator , thereby supplying power from the generator. A stop step to stop;
When the abnormality is detected, the first control device generates a blocking command for blocking the circuit of the electronic device and outputs the blocking command to the electronic device ;
An execution step of performing circuit block of the electronic device according to the block command received from the first control device ;
When the supply of electric power is stopped and the circuit of the electronic device is shut off, the first control device includes an opening step of opening the circuit breaker. The shutoff control method according to claim 1, wherein an output voltage of the power supply is higher than a power supply voltage of the first and second control devices .   The interruption control method according to claim 1, wherein the electronic device is an air conditioner inverter.

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