Motor stall protection control method and device for electric vehicle and electric vehicle
A motor stalling, protection and control technology, applied in the direction of motor control, control system, electrical components, etc., can solve the problems that are not conducive to the electric vehicle to jump out of the stalled state, danger, vehicle system safety and reliability are not high, and achieve improvement Effects of safety and reliability, reduction of risk of temperature rise, increase of possibility
Active Publication Date: 2020-03-24
BORGWARD AUTOMOTIVE CHINA CO LTD
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Problems solved by technology
This scheme adopts the limitation of the locked-rotor current running time and then limits the locked-rotor current. Although it can also play a certain protective function, as the insulation of the motor ages, the time to withstand the locked-rotor current will also decrease. Limiting the operation of the locked-rotor current Therefore, the fixed-time scheme is dangerous.
In addition, limiting the locked-rotor current is not conducive to the electric vehicle jumping out of the locked-rotor state, resulting in low safety and reliability of the vehicle system
Method used
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[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0030] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element refe...
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The invention provides a motor stalling protection control method and device for electric vehicles and an electric vehicle. The method comprises the following steps: when judging that a motor stalls,controlling the motor according to a first given speed and an analog rotor position angle under the first given speed, in order to obtain a rotor position angle when the motor outputs a preset maximumtorque; and controlling the motor according to the rotor position angle when the motor outputs the preset maximum torque and a second given speed, in order to prolong the time for the motor to outputthe preset maximum torque until the motor exits from the stalling condition. The safety and reliability of the electric vehicle system can be improved.
Description
technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and device for motor stall protection and control of an electric vehicle and the electric vehicle. Background technique [0002] In the locked-rotor condition of electric vehicles, the locked-rotor current is 5-10 times the rated current, which makes the stator windings and switching devices heat up rapidly, resulting in burnout. Current solutions for motor stall protection in related technologies such as figure 1 As shown, the controller automatically judges whether the motor is in a locked-rotor state by detecting the command torque and speed. If the motor is in a locked-rotor state, keep a constant current, that is, the torque for 2 seconds, and then judge whether the motor is in a locked-rotor state. If yes, the controller starts Stall protection, control the current limit value below 10A, to protect the motor and battery, and save power. This scheme adopts the...
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IPC IPC(8): H02P29/028
Inventor 孙阳阳
Owner BORGWARD AUTOMOTIVE CHINA CO LTD