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Motor speed control method for hybrid electric vehicle

A hybrid vehicle, speed control technology, applied in the direction of a single motor speed/torque control, electric vehicles, motors, etc., can solve the problems of inaccurate measurement, amplification of measurement error, and difficulty in practical application.

Active Publication Date: 2012-06-27
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. As the sampling time increases, the measurement error will be gradually amplified after the differential operation;
[0007] 2. At low speed, due to inaccurate measurement and other reasons, this method is difficult to be practically applied;
[0008] 3. At high speed, if a low-pass filter is used to obtain stable speed control, there will be a phase delay

Method used

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  • Motor speed control method for hybrid electric vehicle
  • Motor speed control method for hybrid electric vehicle
  • Motor speed control method for hybrid electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment one, such as figure 2 Shown: a motor speed control method in a hybrid electric vehicle, the motor control unit (MCU) receives the position signal detected by the motor rotor position sensor, performs analog-to-digital conversion (A / D conversion) and error compensation, and then passes the phase-locked loop technology , output the current speed and position of the rotor, combined with the provided reference speed, use the phase-locked loop feedback technology to control the motor to rotate at the specified speed, including the following steps:

[0028] A. Detect the current rotor position signal;

[0029] B. Calculate the current speed and position of the rotor;

[0030] C. Perform phase-locked loop control on the current speed and reference speed to generate speed signal output.

[0031] Wherein, step A includes the following sub-steps:

[0032] A1. The motor rotor position sensor outputs sine and cosine position analog signals;

[0033] A2. Input the po...

Embodiment 2

[0078] Embodiment two, such as Image 6 Shown is a flow chart of a typical embodiment of the present invention, comprising the following steps:

[0079] 1. The motor position sensor detects the current position signal of the motor rotor;

[0080] 2. The sensor outputs the detected position signal in the form of sine and cosine analog signals;

[0081] 3. In the MCU, the A / D channel of the DSP performs digital-to-analog conversion on the received sine and cosine position analog signals, and performs decoding and compensation;

[0082] 4. In the DSP, the position phase-locked loop control is performed on the compensated position signal;

[0083] 5. Closed-loop output current speed and position signal;

[0084] 6. When the MCU receives the speed message command sent by the HCU, it performs speed phase-locked loop control with the set reference speed and the actual measured current speed to maintain a stable speed output and make the motor run at the specified reference speed. ...

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Abstract

The invention discloses a motor speed control method in a hybrid powered vehicle. A motor control unit receives position signals detected by a motor rotor position sensor, carries out analog-to-digital conversion and error compensation, calculates current speed and position of a rotor through a phase-lock loop technique, and combines provided reference speed to control a motor to rotate at a set speed by a phase-lock loop feedback technique. The method comprises the following steps: A, detecting the current position signals of the rotator; B, calculating the current speed and the position of the rotor; and C, controlling the current speed and the reference speed by a phase-lock loop to generate speed signal output. The motor speed control method is a typical digital phase-lock loop controlled speed output method; the current speed and the position signals of the rotor are calculated in the phase-lock loop, so as to reduce time delay of position calculation; and because a control algorithm of the phase-lock loop does not adopt differential or difference calculation, even at a high-speed sampling rate, influence of noise on speed is remarkably reduced.

Description

technical field [0001] The invention relates to a method for controlling the rotor speed of a motor, in particular to a method for controlling the speed of the motor by using a phase-locked loop when a permanent magnet synchronous motor is used as an ISG motor of a hybrid electric vehicle. Background technique [0002] With the continuous development of hybrid electric vehicle technology, hybrid electric vehicles powered by gasoline-electric hybrids have gradually been recognized, and the market prospect is very huge. As the key equipment of the hybrid electric motor, the precise speed control of it can not only improve the efficiency of the motor, but also maximize the system efficiency of the entire power system. Permanent magnet synchronous motors, especially permanent magnet synchronous motors with embedded permanent magnets, have the advantages of efficient and adjustable speed operation, so they are more and more widely used in various fields including hybrid power sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/20H02P6/06
CPCY02T10/644Y02T10/64Y02T10/72
Inventor 宋波
Owner CHERY AUTOMOBILE CO LTD
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