CN104149648A - An electric vehicle motor controller - Google Patents

Abstract

The present invention discloses an electric vehicle motor controller, belonging to the technical field of controlling motors. The electric vehicle motor controller of the present invention comprises a motor, a clutch, a gearbox, a wheel, a signal detection module and a motor control module, wherein the motor control module comprises a permanent magnet motor vector control part, a space voltage vector pulse width modulation part, and an analog-to-digital conversion part, wherein the motor and the gearbox are connected through the clutch, and the gearbox is also connected to the wheel; the characteristic is that the signal detection module also comprises a wheel speed sensor. Compared with the prior art, the present invention has the advantages of novel structure and reliable performance.

Description

An electric vehicle motor controller

technical field

The invention belongs to the technical field of automatic control, and more specifically, belongs to a controller for controlling an electric vehicle motor.

Background technique

Due to the increasingly serious energy problems, electric vehicles are gradually replacing fuel vehicles. As a key component of electric vehicles, electric motors play a decisive role in their control performance. At present, the permanent magnet synchronous motor adopts high-performance permanent magnets, which eliminates the influence of the mechanical transmission chain from the rotary motion to the linear motion of the rotary servo motor. It has the advantages of high thrust precision, low loss, short electrical time constant, and fast response. Now it has Become the first choice for electric vehicles. An electric vehicle includes a motor, a clutch, a gearbox, and wheels, wherein the motor and the gearbox are connected through a clutch, and the gearbox is also connected to the wheels.

CN201116080Y patent discloses a DSP-based motor controller for hybrid electric vehicles. Fig. 1 is a schematic structural diagram of an electric vehicle motor controller in the prior art. The motor control module includes a permanent magnet motor vector control module, a space voltage vector pulse width modulation , an analog-to-digital conversion module and a sensor measurement processing module. The permanent magnet motor vector control module determines the mechanism of its control system according to the operation mode and the requirements of the speed command and torque command. Based on the vector control method, it realizes the detection of current, speed, position and fault, and realizes the control of the hybrid electric vehicle motor . Because there are certain problems in the control of the permanent magnet motor in the normal working process of the invention, the torque of the permanent magnet motor cannot be effectively controlled in real time, resulting in a certain degree of pulsation in the speed of the wheels during the driving of the electric vehicle.

Contents of the invention

In order to effectively solve the above technical problems, the present invention provides a motor controller for electric vehicles.

The electric vehicle motor controller of the present invention includes a motor, a clutch, a gearbox, a wheel, a signal detection module and a motor control module, and the motor control module includes a permanent magnet motor vector control part, a space voltage vector pulse width modulation part, and an analog-to-digital conversion part , wherein the motor and the gearbox are connected through the clutch, and the gearbox is also connected to the wheels; it is characterized in that: the signal detection module also includes a wheel speed sensor.

Compared with the prior art, the present invention has the advantages of novel structure, reliable performance, etc., and can effectively overcome the problem of a certain degree of pulsation in the rotational speed of the wheels during the running of the electric vehicle.

Description of drawings

Accompanying drawing 1 is the structural representation of electric vehicle motor controller in the prior art;

Accompanying drawing 2 is the schematic structure diagram of the electric vehicle motor controller of the present invention.

Detailed ways

Fig. 2 is a schematic structural view of the electric vehicle motor controller of the present invention. The electric vehicle motor controller of the present invention includes a motor 70, a clutch 80, a gearbox 90, a wheel 100, and a motor control module 30, and the motor control module 30 includes a permanent magnet motor Vector control part 31, space voltage vector pulse width modulation part 32, analog-to-digital conversion part 33, signal detection module 34, wherein said motor 70 and said gearbox 90 are connected through said clutch 80, and said gearbox 90 is also connected with The wheels 100 are connected; the feature is that the signal detection module 34 is also connected with the wheel speed sensor 110 coaxial with the wheels 100 .

The vehicle controller 10 sends the operation mode, speed command, torque command and other information to the motor control module 30 through the vehicle communication interface 20 . The current sensor and voltage sensor adjustment circuit 60 is connected to the motor 70, the data acquisition head of the current sensor and voltage sensor adjustment circuit 60 is installed on the motor 70, the output terminal of the signal detection module 34 is connected with the vehicle communication interface 20 and the permanent magnet motor vector control The part 31 is connected, the permanent magnet motor vector control part 31 is connected with the space voltage vector pulse width modulation part 32, and the space voltage vector pulse width modulation part 32 is connected with the input end of the inverter 40, and the inverter 40 connects the The direct current is converted into alternating current and sent to the motor 70, and the space voltage vector pulse width modulation part 32 is the SVPWM32.

The current sensor and voltage sensor adjustment circuit 60 samples the D-phase current and Q-phase current signals of the motor 70, and obtains the phase current signal, motor position angle, motor speed and other signal values of the motor 70 through the analog-to-digital conversion part 33 and the signal detection module 34. The motor information is sent from the vehicle communication interface 20 to the vehicle controller 10 through CAN communication, and is input to the permanent magnet motor vector control part 31 at the same time. The vector control part 31 of the permanent magnet motor generates direct-axis and quadrature-axis current reference values by using the maximum torque per ampere control or field-weakening control according to the requirements of the operating mode, speed command, and torque command, and then controls the direct-axis and quadrature-axis currents of the motor 70 Perform proportional-integral control, output direct-axis and quadrature-axis voltage values, the permanent magnet motor vector control part 31 adopts a certain algorithm inverse transformation to generate the input signal of the space voltage vector pulse width modulation part 32, and the output signal input of the space voltage vector pulse width modulation part 32 The inverter 40 is given to drive the motor 70 to rotate.

The input terminal of the protection circuit 50 is connected with the current sensor and the voltage sensor adjustment circuit 60 , and the output terminal of the protection circuit 50 is connected with the inverter 40 and one input terminal of the space voltage vector pulse width modulation part 32 respectively.

The signal detection module 34 is also connected to the wheel speed sensor 110 , the wheel speed sensor 110 may be coaxial with the wheel 100 , or the wheel speed sensor 110 may be arranged in parallel with the wheel 100 . The wheel speed sensor 110 detects the angular velocity of the wheel and transmits it to the signal detection module 34 , and the signal detection module 34 feeds back the detected angular velocity of the wheel to the vehicle controller 10 and the motor control module 30 . Motor 70 and gearbox 90 are connected through clutch 80, and gearbox 90 is also connected with wheel 100; Clearance, when the torque from the motor 70 reaches the wheel 100, it will produce a certain loss. In order to effectively compensate for the energy loss on the transmission chain, it is necessary to continuously monitor the speed on the vehicle wheel 100 in real time. According to the depth of the accelerator pedal Determine the target speed of the electric vehicle, and then continuously adjust the output torque of the motor 70 so that the actual speed of the electric vehicle is as consistent as possible with the target speed.

Claims (1)

1. an electric vehicle motor controller, comprise motor, power-transfer clutch, change speed gear box, wheel, signal detection module and motor control module, motor control module comprises magneto-electric machine vector controlled part, Using dSPACE of SVPWM part, analogue to digital conversion part, wherein said motor is connected by described power-transfer clutch with described change speed gear box, and described change speed gear box is also connected with described wheel; It is characterized in that: described signal detection module also comprises wheel speed sensor.