Three-branch structure control method for driving motor of vehicle
A drive motor control and motor controller technology, applied in the direction of electronic commutation motor control, single motor speed/torque control, motor, etc., can solve the problem of unoptimized iron loss and achieve stable and reliable work
Inactive Publication Date: 2018-05-08
XIANGTAN ELECTRIC MFG CORP LTD
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Problems solved by technology
The reason why the MTPA control strategy can output the maximum torque but not necessarily the maximum efficiency is that the MTPA algorithm only optimizes the copper loss of the motor, but does not optimize the iron loss
Method used
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0024] Such as figure 1 Shown, a kind of automobile drive motor control method of three-branch structure, comprises the following steps:
[0025] Step 1: The motor controller calculates the motor speed;
[0026] The motor speed here adopts a relative value calculation method instead of directly using the absolute speed of the encoder. The calculation formula is: where ω 编码器 Refers to the real-time rotational speed value of the motor read from the encoder, whose absolute value is used for calculation, V dc Refers to the output voltage of the power battery; the ratio of the real-time value of the motor speed to the DC voltage is called the per-unit value of the speed, and its absolute value ω 标幺值 used in subsequent control algorithms.
[0027] Step 2: The motor controller calculates the per-unit value ω of the current speed of the motor 标幺值 Adjust ...
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The invention discloses a three-branch structure control method for a driving motor of a vehicle. The control method comprises the steps of calculating the rotating speed of the motor, adjusting a torque command sent by a vehicle controller according to the current speed of the motor and the voltage of a battery, ensuring that the torque command is limited to an allowable operating range of the motor, determining whether the power of the battery is lower than a set threshold, entering a maximum efficiency control mode if the power of the battery is lower than the set threshold, determining whether the rotating speed and the torque of the motor are in a boundary area if the power of the battery is not lower than the set threshold, entering a maximum power control mode if the rotating speedand the torque of the motor are in the boundary area and entering a maximum torque control mode if the rotating speed and the torque of the motor are not in the boundary area. The invention integratesmaximum torque control, maximum efficiency control and maximum power control to form the three-branch structure control method for the driving motor of the electric vehicle, so that the electric vehicle can use different motor control strategies to manage a power system of the electric vehicle under different operating conditions. Consideration is given to both the power performance and the operating efficiency of the vehicle. The operation is stable and reliable.
Description
technical field [0001] The invention relates to a control method of an electric vehicle drive motor, in particular to a control method of a three-branch structure vehicle drive motor. Background technique [0002] For the interior permanent magnet synchronous motor, its air gap torque equation can be expressed as where P is the number of magnetic poles; I s is the stator current vector; β refers to I s Current vector angle with the q-axis; λ f Refers to the permanent magnet flux linkage. It can be seen from the above equation that there are many kinds of current vectors to choose to produce the same air gap torque, which constitutes different motor torque control algorithms. Among them, the maximum torque per ampere control (MTPA) can produce the maximum torque output with the minimum current in the constant torque region of the motor operation. In automotive motor drive applications, the MTPA control strategy can maximize the stator current to generate air-gap torque,...
Claims
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IPC IPC(8): B60L15/20H02P6/00H02P6/08
CPCB60L15/20B60L2240/421B60L2240/423H02P6/00H02P6/08Y02T10/64Y02T10/72
Inventor 全廷立李理刘训龙宁永芳
Owner XIANGTAN ELECTRIC MFG CORP LTD