Reliable new energy electric vehicle function safety protection method

Abstract

The invention discloses a reliable new energy electric vehicle function safety protection method. The method comprises the following steps: step A, a controller adopts a closed-loop FOC control mode to run; a rotary transformer acquires a running state electric signal of a motor, and feeds back the electric signal to the controller, thereby identifying and judging the motor running state; step B,after the controller detects the rotary transformer fault or identifies inaccurate electric signal, a control mode of the controller is automatically switched into an opened-loop SVC control mode; andstep C, after the controller detects that the rotary transformer fault is eliminated or the identification is accurate, the control mode of the controller is automatically switched to the closed-loopFOC control mode to run. Through the method disclosed by the invention, the safety of the electric vehicle in the driving process can be better guaranteed by smartly utilizing the control mode switching strategy of the motor controller without adding the circuit cost and adding the system complexity and the production process complication.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a reliable method for protecting the functional safety of new energy electric vehicles. Background technique [0002] The current motor control mode commonly used in electric vehicles is closed-loop FOC control. This control mode realizes closed-loop control by measuring electrical signals such as the position, angle, speed, and torque of the resolver on the motor. To correct the deviation of the motor operation, so as to ensure the realization of the predetermined goal, but the resolver has the following defects: [0003] 1. Since the output of the resolver is a modulated analog signal, the calculation of the output signal is more complicated, which may easily lead to inaccurate learning of the motor zero point; [0004] 2. The structure of the resolver is a brushed resolver. The brushes and slip rings are in mechanical sliding contact. The reliability of the resolver is poor...

AI Technical Summary

Problems solved by technology

[0003] 1. Since the output of the resolver is a modulated analog signal, the calculation of the output signal is more complicated, which may easily lead to inaccurate learning of the motor zero point;

[0004] 2. The structure of the resolver is a brushed resolver, the brush and the slip ring are in mechanical sliding contact, the reliability of the resolver is poor, and the service life is short

[0005] These defects may cause the failure of the closed-loop FOC control of the controller and cause the car to suddenly lose control, which will bring safety hazards, so it needs to be improved.