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Method for releasing electric quantity of high-voltage bus capacitor of car motor driver

A technology of motor drivers and high-voltage busbars, which is applied in the direction of control drives, electric vehicles, vehicle components, etc., to achieve the effect of improving safety and reliability

Active Publication Date: 2012-03-14
CHERY AUTOMOBILE CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0006] The present invention designs a method for discharging the electric capacity of the high-voltage bus capacitor of the vehicle motor driver. The technical problem to be solved is that the two ends of the high-voltage bus capacitor of the existing motor driver are connected in parallel with power discharging resistors to realize the discharging method of the remaining capacity of the capacitor. Drawbacks that take longer to release and increase the cost of the drive

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  • Method for releasing electric quantity of high-voltage bus capacitor of car motor driver
  • Method for releasing electric quantity of high-voltage bus capacitor of car motor driver
  • Method for releasing electric quantity of high-voltage bus capacitor of car motor driver

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Embodiment Construction

[0026] Combine below figure 1 and figure 2 , the present invention is further described:

[0027] Such as figure 1 As shown, the torque time loading function is:

[0028] 1. M=3T / t*t 1 , where 0≤ t 1 1 for time;

[0029] 2. M=-3T / t*t 1 +6T, where t≤ t 1 1 for time;

[0030] 3. M=3T / t*t 1 -12T, where 3t≤t 1 1 for time.

[0031] Such as figure 2 As shown, the power discharge method of the high-voltage bus capacitor of the vehicle motor driver is as follows:

[0032] When the vehicle key switch is turned off and the vehicle high-voltage relay is off, the motor controller enters the active discharge program, otherwise the motor controller works normally;

[0033] The motor position angle value θ offset by the motor position sensor sampled each time is θ 1 Time;

[0034] The motor controller enters the active discharge program, and the timer t 1 start the timer;

[0035] When timer 0 ≤ t 1 When 1 and torque time loading function to get , and make the requested...

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Abstract

The invention relates to a method for releasing electric quantity of a high-voltage bus capacitor of a car motor driver. When a whole car key switch is closed and a whole car high-voltage relay is disconnected, a motor controller enters into an initiative releasing procedure; or the motor driver works normally; when a motor position sensor samples that a motor position angle theta is shifted to theta1 each time, the motor controller enters into the initiative releasing procedure and a timer t1 starts to time; when the timer t1 is more than or equal to 1 and less than 4t, the motor controller is switched to a torque control mode; a figure shown in the specification is calculated by a loading function according to the current timer t1 and a torque time and a request torque T1 is equal to the figure; or when the timer t1 is more than or equal to 4t, the motor controller is switched to a closing mode and the request torque T1 is equal to 0, so that the initiative releasing procedure is finished by the motor controller. According to the method provided by the invention, the releasing of residual charges can be faster finished and the use of a releasing resistor is reduced, so that the cost of the motor controller is reduced and the safety reliability of the whole car is improved.

Description

technical field [0001] The invention relates to a power discharge method for a motor control system of a pure electric car, in particular to a power discharge method for a high-voltage busbar capacitor of a vehicle motor driver. Background technique [0002] At present, people pay more and more attention to the protection of the environment and the effective and rational use of energy. Therefore, pure electric vehicles with high efficiency, energy saving and environmental protection have become one of the development trends of the automobile industry. The electric drive system can achieve the purpose of low energy consumption and zero emission, and has great market prospects. [0003] When used in cars, limited by the installation space, the size of the motor drive system is strictly required. Therefore, the sine wave permanent magnet synchronous motor is generally used in the drive system of pure electric vehicles. It has the characteristics of reliable operation, small si...

Claims

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Application Information

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IPC IPC(8): B60L15/00
Inventor 罗晓林伟义王金磊
Owner CHERY AUTOMOBILE CO LTD
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