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Motor locked-rotor protecting method of electric car electric driving system

An electric drive system, electric vehicle technology, applied in electric vehicles, control drive, electric energy management, etc., can solve the problems of cost increase, inability to completely avoid burnout, etc., and achieve the effect of reducing current

Active Publication Date: 2012-02-15
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there are no protection measures, even if you choose a power tube with a current higher than 1.2X, although the burnout time can be prolonged, the cost will be greatly increased, and burnout cannot be completely avoided

Method used

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  • Motor locked-rotor protecting method of electric car electric driving system
  • Motor locked-rotor protecting method of electric car electric driving system
  • Motor locked-rotor protecting method of electric car electric driving system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 2 As shown, in the motor stall protection method of the electric drive system of the electric vehicle in this embodiment, the electric drive system of the electric vehicle is provided with a motor controller, and according to the torque demand of the accelerator pedal, the three-phase drive axle of the motor controller is used to drive the motor.

[0020] First, the motor controller detects the motor speed and torque in real time. When -nrpm<motor speed v<nrpm (n is a predetermined integer less than 100), the motor controller judges that the motor has stopped, and starts timing when the motor stops .

[0021] The motor controller divides the motor torque range from low to high into four intervals (0, Tq1), [Tq1, Tq2), [Tq2, Tq3), [Tq3, Tq4], among which the intervals (0, Tq1), [ The predetermined times T corresponding to Tq1, Tq2), [Tq2, Tq3), and [Tq3, Tq4] are sequentially T1, T2, T3, and T4, where T1>T2>T3>T4.

[0022] After the motor stops, the mo...

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Abstract

The invention provides a motor locked-rotor protecting method of an electric car electric driving system, which can prevent a power tube in a driving motor controller from being burned by locked-rotor of a motor. The motor locked-rotor protecting method of the electric car electric driving system is characterized in that: a motor controller is arranged inside the electric car electric driving system, the motor is driven by a three-phase driving axle of the motor controller according to a torque requirement of an accelerator pedal, the motor controller is the key to instantly detect a motor rotation speed and a torque, timing is begun when the motor stops rotating, if a stalling lasting time t of the motor is more than or equal to a preset time T corresponding to the torque under the same torque Tq, the motor is judged to have locked-rotor, the torque requirement of the accelerator pedal is ignored by the motor controller after the locked-rotor of the motor happens, and the motor torque is unloaded until a non-locked-rotor state of the motor is detected.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle control, and in particular relates to a motor stall protection method of an electric drive system of an electric vehicle. Background technique [0002] At present, with the maturity of technology, energy-saving and environmentally friendly electric vehicles have been recognized by the public and gradually entered the consumer market, but because their prices are much higher than those of internal combustion engine vehicles of the same specification, the promotion of electric vehicles has been hindered. In addition to the power battery, the electric drive system-the drive motor and the drive motor controller are also the reasons for the high price of electric vehicles. Such as figure 1 As shown, a motor controller is installed in the electric drive system of an electric vehicle, and a three-phase drive bridge composed of six power tubes in the motor controller is used to drive the motor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20B60L15/30
CPCY02T10/72
Inventor 孙玉玲李芳林伟义
Owner CHERY AUTOMOBILE CO LTD
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