Electric vehicle and its torque analysis method and torque analysis system

Abstract

The invention discloses an electric car and a torque analysis system and method thereof. The torque analysis method comprises the following steps that according to the speed of the car, the opening degree of an acceleration pedal and the rotating speed of a driving motor, initial required torque T1 of the driving motor when the acceleration pedal is stamped is obtained; according to the opening degree of the acceleration pedal and the opening degree changing rate of the acceleration pedal, a first required torque compensation coefficient K1 is determined; according to the T1 and the K1, an ideal required torque T3 of the driving motor is obtained; according to the T3, the maximum driving torque of the driving motor and the maximum feedback torque of the driving motor, the final required torque of the driving motor is obtained. According to the torque analysis method of the electric car, it can be ensured that the torque is slowly increased when a user stamps the pedal in the using process and rapidly decreased when the user loosens the acceleration pedal, torque feedback can be performed so as to improve the energy recycling efficiency, and the user experience can be improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an electric vehicle and its torque analysis method and torque analysis system. Background technique [0002] In the related art, for the analysis of how to drive the required torque of the motor, the sum of the maximum torque of the engine at the output shaft end and the maximum driving torque of the motor at the output shaft end is usually taken as the required torque when the accelerator pedal opening is 100%, and then Analyze the required torque according to the linear difference of the pedal opening; another method is to use the external characteristic curve of the engine and the external characteristic curve of the motor to obtain the required torque of the wheels in different gears, and then calculate the envelope, and determine the acceleration through the envelope The corresponding maximum demand torque when the pedal is fully open, and then analyze the demand t...

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Problems solved by technology

[0003] The analysis of the required torque in the related art has the following problems. The analysis of the required torque is only performed from the pedal opening and the maximum driving torque of the motor. However, when the user steps on the accelerator pedal, he often wants to increase the speed. It is to decelerate or even brake. Therefore, this analysis of the required torque only from the pedal opening and the maximum driving torque of the motor may not be able to meet the desired effect of the user.

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