JP2001339801A - Electric controlling device for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric controlling device for an electric vehicle capable of guaranteeing safety accurately in the driving operations of the vehicle by discriminating an abnormal state with a small capacity computer. SOLUTION: This electric controlling device for the electric vehicle is provided with a first controller 10 that inputs signals representing the driving operations and outputs drive controlling signals to electric motors 91, 92 that drive the wheels of the vehicle, and a second controller 20 that inputs the drive controlling signals from the first controller 10 to control the supply of electric power to the electric motors 91, 92. The abnormality of the electric vehicle is detected based on the detections by a group of sensors 21, and the second controller 20 performs the processes of outputting the signals representing the detected abnormality to the first controller 10. In these processes, the second controller 20 transmits the signals in order of the higher urgency of the abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle which travels by driving an electric motor mounted on a vehicle body, and more particularly, to stop the vehicle when an abnormal condition occurs by stopping power supply to the electric motor. The present invention relates to an electric control device for an electric vehicle which is obtained.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned electric vehicle, a first controller for inputting a signal representing a driving operation and outputting a drive control signal for a driving electric motor mounted on the vehicle, and the drive control signal, are input. When the power supply to the electric motor is controlled, the presence or absence of an abnormal state of the power supply system to the electric motor is determined, and a signal indicating the determination result is given to the first controller every predetermined time. An electric control device including a second controller that allows the first controller to output the drive control signal according to the state of the power system is employed.

In this type of electric control device, input signals supplied from a large number of sensors for detecting an abnormality in the power supply system of the vehicle as the second controller are output to a plurality of sensors corresponding to each abnormal state. Since the discriminating means for discriminating each abnormal state by assigning to a bit is employed, the capacity of the computer executing the processing of the abnormal discriminating means increases according to the number of abnormal states to be detected. For this reason, a large-capacity computer must be used, and the manufacturing cost of such an electric control device is high.

[0004]

SUMMARY OF THE INVENTION It is a main object of the present invention to solve the above-mentioned problems by using a small-capacity computer to accurately determine the above-mentioned abnormal state and accurately assure the safety of the driving operation of the vehicle. An object of the present invention is to provide an electric control device for a vehicle.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a first controller for inputting a signal representing a driving operation and outputting a drive control signal for a drive electric motor mounted on the vehicle; When power is input, the power supply to the electric motor is controlled, and the presence or absence of an abnormal state of the power supply system to the electric motor is determined, and a signal indicating the determination result is given to the first controller every predetermined time. An electric control device for an electric vehicle including a second controller configured to allow the first controller to output the drive control signal in accordance with a state of the power system. Input signals assigned from a plurality of sensors provided for detecting an abnormality in the power supply system are assigned to predetermined bits by a predetermined combination, and are assigned. An abnormal state is determined based on a combination of the input signals obtained, and based on the determination result, a signal indicating an abnormal state that requires prohibition of starting or running of the vehicle is preferentially given to the first controller according to the degree of urgency. To the first controller as needed, and a signal indicating another abnormal state is provided to the first controller as needed.
This is achieved by providing an electric control device for an electric vehicle, wherein the first controller allows output of a drive control signal for the electric motor in response to a signal indicating the abnormal state. .

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing an entire electric control device for an electric vehicle according to the present invention.

[0007] The electric control device for an electric vehicle includes an electric motor 9 for driving a wheel by inputting a signal representing a driving operation.
First controller 1 that outputs 1,92 drive control signals
0, and a second controller 20 that inputs a drive control signal from the first controller 10 and controls power supply to the electric motors 91 and 92.

The first controller 10 includes a main switch 11, a shift position sensor 12, and an accelerator sensor 1.
3 is connected. The main switch 11 is a switch for switching the electric vehicle between an operating state and a non-operating state. The shift position sensor 22
It detects the position of a shift lever (not shown) (for example, backward (R), neutral (N), forward (D)). The accelerator sensor 13 detects an amount of depression of an accelerator pedal (not shown). First
The controller 10 requests torque from the electric motors 91 and 92 based on a signal indicating a driving operation input from each of the sensors 12 and 13 and a signal indicating a state of the electric vehicle and the like input from a second controller 20 described later. An amount and the like are determined, and a drive control signal indicating the determined amount of torque and the like is output to the second controller 20. Also, the first
A display device 14 is also connected to the controller 10. The display device 14 is for notifying an abnormality of the electric vehicle.

The second controller 20 includes an inverter 93
And controls the inverter 93 based on the drive control signal input from the first controller 10 to control the power supply to the left and right electric motors 91 and 92. The inverter 93 inputs a DC voltage from the high-voltage battery 94 via a relay 95, converts the DC voltage into an AC voltage, and
92. The high-voltage battery 94 is charged by a charger 96 as needed.
The charger 96 also charges a low-voltage battery 97 that supplies a voltage to the first controller 10.

The second controller 20 is also connected to a sensor group 21 for detecting an abnormality. Sensor group 2
1 is a current sensor, a magnetic pole position sensor and a temperature sensor respectively attached to the electric motors 91 and 92, a temperature sensor attached to the inverter 93, and a voltmeter for detecting the voltage of the high voltage battery 94. And so on. The second controller 20 is configured by a microcomputer, and repeatedly executes a program represented by the flowchart shown in FIG. 2 to detect the electric current based on the detection by the sensor group 21 and the drive control signal from the first controller 10. An abnormality of the automobile is detected, and a signal indicating the detected abnormality is transmitted to the first controller 10.
Perform processing to output to Further, the second controller 20 has a built-in memory 20a for temporarily storing the detected abnormality.

Next, the operation of the embodiment configured as described above will be described. When the electric vehicle is in a normal operation state, the first controller 10 determines a torque amount and the like required of the electric motors 91 and 92 based on a signal indicating a driving operation input from each of the sensors 12 and 13, A drive control signal indicating the determined torque amount or the like is output to the second controller 20. At this time, the second controller 2
0 is the inverter 93 based on the input drive control signal.
To control the power supply to the left and right electric motors 91 and 92. As a result, the electric vehicle is driven and operated by the driver.

In the above state, the second controller 20
Has repeatedly executed the program represented by the flowchart shown in FIG. Second controller 2
In step 0, after the execution of this program is started in step 100, it is determined in step 102 whether an abnormality is detected. At this time, if all the detected values by the sensor group 21 and the drive control signal input from the first controller 10 are all normal, it is determined to be “NO” and the program proceeds to step 104.

In step 104, it is determined whether it is time to transmit a signal to the first controller 10. This signal indicates the state of the electric vehicle, and is initially set to a value indicating that the electric vehicle is normal and stored in the memory 20a. The transmission timing is a predetermined short time (for example, 5 ms).
It is set in advance so that each time. Step 10 above
At the time of execution of step 4, if it is not the transmission timing, the second controller 20 determines “NO” and advances the program to step 102 again. On the other hand, if it is the transmission timing at this time, it is determined to be “YES” and the program is executed in step
6 to the first controller 10 for the memory 20a
The stored signal is transmitted. By this repetitive execution, the second controller 20 continues to transmit a signal indicating the state of the electric vehicle to the first controller 10 periodically at predetermined short intervals.

During the above-described repetition, if an abnormality is detected from any of the detection values of the sensor group 21 or the drive control signal input from the first controller 10,
The second controller 20 determines in step 102 that “YE
S ”, and the program proceeds to Step 108.
In step 108, a signal indicating the detected abnormality is determined and stored in the memory 20a. In this case, the signal indicating the abnormality is determined according to a table stored in advance (see FIG. 3), and each signal that can be transmitted at one time represents one type of abnormality by a combination of a plurality of bits. The signal indicating the abnormality stored in the memory 20a as described above is transmitted to the first controller 10 by the process of step 106 when the next transmission timing comes. At this time, the first controller 10 executes a predetermined process for the abnormality. For example, abnormalities in the current values of the electric motors 91 and 92, the first controller 1
For an abnormality with a high degree of urgency, such as an abnormality in the drive control signal from 0, a drive control signal for forcibly stopping the electric vehicle is output to the second controller 20. On the other hand, for an abnormality having a relatively low urgency such as a rise in the temperature of the electric motors 91 and 92 and the inverter 93, the abnormality is displayed on the display device 14.

By the way, the second controller 20 also executes a process of determining the order of transmission of abnormalities to the first controller 10 in step 110 when the abnormalities are stored in step 108. This means that, when a plurality of signals waiting for output to the first controller 10 are stored in the memory 20a, each signal indicates an abnormality that is highly urgent and requires an emergency stop of the electric vehicle, or This is a process of determining whether or not the transmission process to the first controller 10 is determined by determining whether or not only the display process has a relatively low urgency and indicates an abnormality that requires only the display process. In this case, signals indicating abnormalities having a high degree of urgency are transmitted with priority in order. Also, signals indicating abnormalities of the same urgency are transmitted in the order of detection.

As described above, in the above embodiment,
The second controller 20 transmits to the first controller 10 in order from a signal indicating an abnormality with a high degree of urgency. Therefore, even if the number of abnormalities that can be transmitted in a single transmission of a signal is single, abnormalities with a high degree of urgency are transmitted promptly, and there is no delay in dealing with the abnormalities. Therefore, it is possible to keep the safety of the electric vehicle high while configuring the second controller 20 to be small and inexpensive.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an entire electric control device for an electric vehicle according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a program executed by a second controller of FIG. 1;

FIG. 3 is a table that associates the abnormality of the electric vehicle with a bit pattern of a signal.

[Explanation of symbols]

Reference Signs List 10: first controller, 12: shift position sensor, 13: accelerator sensor, 14: display device, 20: second controller, 21: abnormality detection sensor group, 91, 92
... Electric motor.

Claims (4)

[Claims] A first controller for inputting a signal representing a driving operation and outputting a drive control signal for a driving electric motor mounted on the vehicle; and supplying power to the electric motor when the driving control signal is input. Is controlled, and the presence or absence of an abnormal state of the power supply system to the electric motor is determined, and a signal indicating the determination result is given to the first controller at predetermined time intervals. An electric control device for an electric vehicle including a second controller configured to allow the output of the drive control signal in accordance with the state of the power supply system, wherein the second controller is provided to detect an abnormality in the power supply system. Input signals given from a plurality of sensors are assigned to predetermined bits by a predetermined combination, and abnormalities are caused by a combination of the assigned input signals. State is determined, and a signal indicating an abnormal state that requires prohibition of starting or running of the vehicle is given to the first controller preferentially in accordance with the degree of urgency based on the result of the determination. An abnormality determining means for providing a signal indicating a state to the first controller as needed, such that the first controller allows the output of the drive control signal of the electric motor in response to the signal indicating the abnormal state. An electric control device for an electric vehicle, comprising: 2. The system according to claim 1, wherein the first controller gives a signal indicating an abnormal state given from the second controller to a display device installed at a position easily viewable by a driver of the vehicle, and the display device displays the signal of the vehicle. The electric control device for an electric vehicle according to claim 1, wherein an abnormal state is displayed. 3. An electric control device for an electric vehicle, wherein the signal indicating the driving operation according to claim 1 is obtained by a shift position sensor and an accelerator sensor provided in the vehicle. 4. An abnormality judging means of the second controller gives a signal representing an abnormal state which hinders starting or running of the vehicle to the first controller with priority, and the first controller outputs the signal of the driving signal. An electric control device for an electric vehicle, wherein the output is stopped so that the driving of the electric motor is prohibited.