Electric vehicle and torque safety monitoring and controlling method and device thereof

Abstract

The invention discloses a torque safety monitoring and controlling method and device of an electric vehicle. The method includes the steps that actual torque of a motor in the electric vehicle is obtained, and current demand torque of the electric vehicle is obtained; the current gear state of the electric vehicle is obtained; if it is judged that the current demand torque is positive demand torque according to the current gear state, torque difference is calculated according to a first formula, the actual torque and the current demand torque; if it is judged that the current demand torque is negative demand torque according to the current gear state, torque difference is calculated according to a second formula, the actual torque and the current demand torque; integration is carried out on the torque difference according to preset duration to generate an integral value; if absolute value of the integral value is larger than a first preset threshold value, an alarm is given, and preset safety control is carried out on the motor. According to the torque safety monitoring and controlling method in the embodiment, the torque safety monitoring range is enlarged, torque safety monitoring capacity is improved, the larger the torque difference is, the higher response speed is, and misjudgment caused by unstable currents is avoided.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to an electric vehicle and its torque safety monitoring and control method and device. Background technique [0002] At present, in the torque safety monitoring and control of electric vehicles, the actual torque of the current motor is mainly calculated based on parameters such as motor inductance, current, pole pair number, and magnetic flux, and is calculated based on signals such as the accelerator pedal, brake pedal, gear lever, and speed. The current request torque of the driver is obtained, and then the request torque limits the actual torque within a certain range, so that the actual torque of the motor can reflect and execute the driver's demand torque, ensuring driving safety. [0003] However, the current torque safety monitoring of electric vehicles is not comprehensive enough, making it difficult to effectively monitor driving hazards; and no matter how much the actual...

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Problems solved by technology

[0003] However, the current torque safety monitoring of electric vehicles is not comprehensive enough, making it difficult to effectively monitor driving hazards; and no matter how much the actual torque is different from the required torque, the response time is the same

Therefore, when there is a large gap between the actual torque and the demanded torque, there may be a phenomenon that cannot be processed in time due to insufficient response time, resulting in driving danger; in addition, during the driving process of the vehicle, the current is relatively unstable, so the calculated actual torque It is also not stable enough, and it is prone to large instantaneous deviations, which may lead to misjudgment of the gap between the actual torque and the required torque, and then obtain wrong judgment results and operation

[0004] In summary, the current torque safety monitoring and control methods for electric vehicles still need to be improved.

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