TWI786928B - Electric vehicle motor load reduction control system - Google Patents

Abstract

The invention discloses a motor load reduction control system for an electric vehicle, which includes an accelerator position sensor, a vehicle controller, a motor controller and a motor. The throttle position sensor generates a throttle signal. The vehicle controller is connected to the accelerator position sensor, including an analog/digital converter and a processing unit. The analog/digital converter is connected to receive the throttle signal and convert the throttle signal into a digital control signal. The processing unit is connected with the analog/digital converter and the motor controller, and receives digital control signals. The motor controller is connected to the vehicle controller through a signal line, and connected to the vehicle controller through a data bus. The motor is connected to the motor connection end of the motor controller, wherein the vehicle controller transmits a digital control signal to the motor controller through the data bus, and when an abnormal state occurs in the data bus, the throttle signal is converted into a load reduction control signal, and Send the load reduction control signal to the motor controller to control the operation of the motor.

Description

Electric vehicle motor load reduction control system

The invention relates to a motor load reduction control system, in particular to an electric vehicle motor load reduction control system.

A traditional vehicle control system uses a throttle position sensor (TPS) to send a signal to a motor controller to control the motor. Since the throttle position sensor is connected to the motor controller with a hard circuit, the car factory will fine-tune the throttle response of the motor controller. However, the manufacturer of the motor controller does not know the throttle control of the vehicle, resulting in a tough Due to multiple revisions of the body, the development schedule of the motor controller cannot be effectively shortened, which affects the mass production time of the vehicle.

In current vehicles, the control signal line of the accelerator position sensor is first connected to the vehicle controller (VCU), and then the vehicle controller controls the operation of the motor controller. Currently, there are two methods. The first method is to use the vehicle controller to read the control signal from the accelerator position sensor, and then provide the control signal to the motor controller in the form of an analog signal. However, since the conversion of the control signal requires a digital-to-analog converter of the hardware, the cost of setting up the hardware is increased. The second approach is that the vehicle controller directly issues commands to the motor controller through Controller Area Network (CAN) communication.

Based on the above, the vehicle controller uses the controller area network to issue commands to the motor controller. This method can certainly reduce hardware development costs, shorten model development time, and improve the portability of vehicle control strategies. However, due to The communication of the controller area network is shared by multiple vehicle components, so This is likely to cause the problem of communication failure of the controller area network, so that when the user has a communication abnormality in the controller area network, it will cause loss of control of the vehicle and damage to personnel and property.

Accordingly, how to provide a motor load reduction control system for an electric vehicle has become an urgent research topic.

Solve the problem that the controller area network is prone to communication failure.

In view of the above problems, the present invention discloses a motor load reduction control system for an electric vehicle, which includes a throttle position sensor (TPS), a vehicle controller, a motor controller and a motor. The accelerator position sensor detects an accelerator signal. The vehicle controller is connected to the accelerator position sensor to receive the accelerator signal. The motor controller is connected to the vehicle controller through a signal line, and connected to the vehicle controller through a data bus. The motor is connected to the motor controller, wherein the vehicle controller transmits the digital control signal to the motor controller through the data bus; when the motor controller determines that an abnormal state occurs on the data bus, the motor control The device receives the throttle signal through the signal line, and generates a load reduction control signal according to the throttle signal, so as to control the operation of the motor according to the load reduction control signal.

The invention discloses a motor load reduction control system for an electric vehicle, which includes a throttle position sensor (TPS), a vehicle controller, a motor controller and a motor. The accelerator position sensor detects an accelerator signal. The vehicle controller is connected to the accelerator position sensor to receive the accelerator signal. The motor controller is connected to the vehicle controller through a signal line, and connected to the vehicle controller through a data bus. The motor is connected to the motor controller, wherein the vehicle controller transmits the digital control signal to the motor controller through the data bus; when the vehicle controller determines that the data When an abnormal state occurs on the bus, the vehicle controller converts the throttle signal into a load reduction control signal, and transmits the load reduction control signal to the motor controller through the data bus, and the motor controller The load control signal controls the operation of the motor.

The present invention judges whether the digital control signal transmitted by the data bus has errors, omissions, or periodic changes through the vehicle controller or the motor controller, and when an abnormal state occurs, it continues to run in the load reduction mode. The electric vehicle is driven at a lower power to prevent the vehicle from being unable to drive or out of control when the communication of the data bus is abnormal. In addition, the product development cost and firmware development time can be reduced through the electric vehicle motor load reduction control system of the present invention, and the quantity of physical wiring can be reduced.

1: Electric vehicle motor load reduction control system

11: Throttle position sensor

12: Vehicle controller

121:Analog/digital converter

122: Processing unit

12A: input terminal

12B: the first transmission end

12C: the second transmission end

13: Motor controller

13A: the third transmission end

13B: the fourth transmission end

13C: Motor connection end

14: Motor

15: buffer

15A: the first connection end

15B: the second connection end

W: signal line

B: data bus

FIG. 1A is a schematic block diagram of the electric vehicle motor load reduction control system of the present invention; and FIG. 1B is a block schematic diagram of the electric vehicle motor load reduction control system of the present invention including a buffer.

Please refer to FIG. 1A , which is a schematic block diagram of the electric vehicle motor load reduction control system of the present invention. The electric vehicle motor load reduction control system 1 includes a throttle position sensor (TPS) 11 , a vehicle controller 12 , a motor controller 13 and a motor 14 . The throttle position sensor 11 generates an analog throttle signal. The vehicle controller 12 has an input terminal 12A, a first transmission terminal 12B and a second transmission terminal 12C. The input terminal 12A is connected to the first transmission terminal 12B and the accelerator position sensor 11 , and the vehicle controller 12 includes an analog/digital converter 121 and a processing unit 122 . The analog/digital converter 121 is connected to the input terminal 12A to receive the throttle signal and convert the throttle signal into a digital control signal No. The processing unit 122 can be an integrated circuit chip of a central processing unit (CPU), which is connected to the analog/digital converter 121 and the second transmission terminal 12C, and receives digital control signals. The motor controller 13 has a third transmission terminal 13A, a fourth transmission terminal 13B and a motor connection terminal 13C. The third transmission terminal 13A is connected to the first transmission terminal 12B of the vehicle controller 12 through a signal line W, and the fourth transmission terminal 13A is connected to the vehicle controller 12 through a signal line W. The transmission terminal 13B is connected to the second transmission terminal 12C of the vehicle controller 12 through a data bus B, wherein the data bus B can be a controller area network bus (CAN bus). The motor 14 is connected to the motor connection terminal 13C of the motor controller 13, wherein the vehicle controller 12 transmits a digital control signal to the motor controller 13 through the data bus B. In the first embodiment of the present invention, when the vehicle controller When the processing unit 122 of 12 determines that an abnormal state occurs in the data bus B, the processing unit 122 converts the throttle signal into a load reduction control signal, and transmits the load reduction control signal to the motor controller 13 through the data bus B, and the motor control The controller 13 controls the operation of the motor 14 according to the load reduction control signal.

Please refer to FIG. 1B , which is a schematic block diagram including a buffer according to the first embodiment of the electric vehicle motor load reduction control system of the present invention. In this embodiment, the vehicle controller 12 further includes a buffer 15 (buffer), and the buffer 15 includes a first connection end 15A and a second connection end 15B, and the first connection end 15A is connected to the input end 12A and the analog A/D converter 121, the second connection end 15B is connected to the first transmission end 12B. In other words, the accelerator position sensor 11 transmits the accelerator signal to the motor controller through the input terminal 12A of the vehicle controller 12, the first connection terminal 15A, the second connection terminal 15B and the first transmission terminal 12B of the buffer 15 13 of the third transmission end 13A.

In the present invention, the abnormal state includes three situations, which are described in the following content respectively. The first abnormal state is when the packet error rate of the digital control signal transmitted by the data bus B exceeds a preset value. For example, the packet error rate can be detected by means of Cyclic Redundancy Check (CRC). Further, in data transmission, the number of bit errors is the number of bits in the received channel data stream that have been changed due to noise, interference, distortion, or bit synchronization errors. Bit error rate (BER) refers to the error per unit time The number of bits. Since the throttle signal has been converted into a digital control signal by the analog/digital converter 121 and transmitted through the data bus B, by checking the packet error rate of the digital control signal transmitted by the data bus B, it can be confirmed that the data bus B transmits the digital signal Control the accuracy of the signal. For example, when the digital control signal contains 128 packets, if more than 70 of the 128 packets generate errors, it means that the data bus B has an abnormal state, and the processing unit 122 converts the throttle signal into a load reduction control signal, and borrows The load reduction control signal is transmitted from the data bus B to the motor controller 13, and the motor controller 13 controls the operation of the motor 14 according to the load reduction control signal.

The second abnormal state is the state when the packet loss rate of the digital control signal transmitted by the data bus B exceeds a preset value. Similarly, it is determined whether an abnormal state occurs by checking whether the packet loss ratio in the digital control signal transmitted by the data bus B exceeds a preset value. For example, when 50 packets are lost among the 128 packets of the digital control signal, it means that the data bus B has an abnormal state, and the processing unit 122 converts the throttle signal into a load reduction control signal, and transmits the load reduction signal through the data bus B. The load control signal is sent to the motor controller 13, and the motor controller 13 controls the operation of the motor 14 according to the load reduction control signal.

The third abnormal state is the state when the packet period of the data bus B transmitting the digital control signal changes more than a preset value. Since the packet transmission is a fixed period, when the packet transmission period is greater than a preset value, it indicates that the data bus B is in an abnormal state. For example, if the packet cycle of transmitting the digital control signal is 50 per second, when the cycle of transmitting the packet changes to 60 per second, it means that the data bus B has an abnormal state, and the processing unit 122 converts the throttle signal into a load reduction control signal , and transmit the load reduction control signal to the motor controller 13 through the data bus B, and the motor controller 13 controls the operation of the motor 14 according to the load reduction control signal.

In the present invention, when the data bus B is not abnormal, the motor controller 13 controls the motor 14 to operate according to the digital control signal transmitted from the data bus B.

In the aforementioned first embodiment, the vehicle controller 12 judges whether the data bus B is abnormal, and in the second embodiment of the present invention, the motor controller 13 judges whether the data bus B is abnormal, and at that time When the motor controller 13 determines that an abnormal state occurs in the data bus bar B, it receives the throttle signal through the signal line W, and generates a load reduction control signal according to the throttle signal, so as to control the operation of the motor 14 according to the load reduction control signal, that is, When the motor controller 13 determines that the data bus B is abnormal, it does not process the digital control signal received from the data bus B.

In the aforementioned first embodiment, the vehicle controller 12 judges whether the data bus B is abnormal. In the aforementioned second embodiment, the motor controller 13 judges whether the data bus B is abnormal. In the third embodiment of the present invention In the above, it is the vehicle controller 12 and the motor controller 13 that simultaneously determine whether the bus bar B is abnormal. The details are as described above and will not be repeated here.

Accordingly, the present invention judges whether the digital control signal transmitted by the data bus has an error, omission, or periodic change through the vehicle controller or the motor controller, and when an abnormal state occurs, it continues to run in the load reduction mode, and the user can The electric vehicle is driven with a relatively low motor power to prevent the vehicle from being unable to drive or out of control when the communication of the data bus is abnormal. In addition, the product development cost and firmware development time can be reduced through the electric vehicle motor load reduction control system of the present invention, and the quantity of physical wiring can be reduced.

To sum up, what is described above is only a description of the implementation or examples of the technical means adopted by the present invention to solve the problems, and is not intended to limit the scope of the patent implementation of the present invention. That is, all equivalent changes and modifications that are consistent with the scope of the patent application of the present invention, or made according to the scope of the patent of the present invention, are covered by the scope of the patent of the present invention.

1: Electric vehicle motor load reduction control system

11: Throttle position sensor

12: Vehicle controller

121:Analog/digital converter

122: Processing unit

12A: input terminal

12B: the first transmission end

12C: the second transmission end

13: Motor controller

13A: the third transmission end

13B: the fourth transmission end

13C: Motor connection end

14: Motor

W: signal line

B: data bus

Claims (7)

A motor load reduction control system for an electric vehicle, comprising: an accelerator position sensor for detecting an accelerator signal; a vehicle controller having an input terminal, a first transmission terminal and a second transmission terminal, the input terminal is connected to the The first transmission terminal and the throttle position sensor receive the throttle signal; a motor controller has a third transmission terminal, a fourth transmission terminal and a motor connection terminal, and the third transmission terminal is connected to the motor through a signal line. The first transmission terminal of the vehicle controller and the fourth transmission terminal are connected to the second transmission terminal of the vehicle controller through a data bus; and a motor is connected to the motor controller; wherein, the vehicle The controller sends a digital control signal to the motor controller through the data bus; when the vehicle controller determines that an abnormal state occurs on the data bus, the vehicle controller converts the throttle signal into a load reduction control signal, and transmit the load reduction control signal to the motor controller through the data bus, and the motor controller controls the operation of the motor according to the load reduction control signal. A motor load reduction control system for an electric vehicle, comprising: an accelerator position sensor for detecting an accelerator signal; a vehicle controller having an input terminal, a first transmission terminal and a second transmission terminal, the input terminal is connected to the The first transmission terminal and the throttle position sensor receive the throttle signal; a motor controller has a third transmission terminal, a fourth transmission terminal and a motor connection terminal, and the third transmission terminal is connected to the motor through a signal line. The first transmission terminal of the vehicle controller and the fourth transmission terminal are connected to the second transmission terminal of the vehicle controller through a data bus; and a motor is connected to the motor controller; wherein, the vehicle The controller transmits the digital control signal to the motor controller through the data bus; when the motor controller determines that an abnormal state occurs on the data bus, the motor controller The throttle signal is received through the signal line, and a load reduction control signal is generated according to the throttle signal, so as to control the operation of the motor according to the load reduction control signal. The electric vehicle motor load reduction control system according to claim 1 or 2, wherein the abnormal state is a state when the packet error rate of the digital control signal transmitted by the data bus exceeds a preset value. The electric vehicle motor load reduction control system as described in claim 1 or 2, wherein the abnormal state is a state when the packet loss rate of the digital control signal transmitted by the data bus exceeds a preset value. The electric vehicle motor load reduction control system according to claim 1 or 2, wherein the abnormal state is a state when the packet period of the digital control signal transmitted by the data bus is greater than a preset value. The electric vehicle motor load reduction control system according to claim 1, wherein the vehicle controller includes a processing unit, and the processing unit determines that the abnormal state occurs on the data bus. The electric vehicle motor load reduction control system as described in claim 6, wherein the vehicle controller further includes: an analog/digital converter, which converts the throttle signal into the digital control signal, and the processing unit receives the digital control signal signal.

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