Brushless direct current motor-assisted electric power steering controller and control method thereof

Abstract

The invention discloses a brushless direct current motor-assisted electric power steering controller and a control method thereof. An MC33034P120 driving integrated chip is connected in series with the rear end of a microprocessor; the output of the driving integrated chip is connected with a power bridge; the output of the power bridge is connected with a brushless direct current motor and a current feedback and protection module respectively; the current feedback and protection module is connected with a feedback current signal processing module; the output of the feedback current signal processing module is connected in series between the microprocessor and the driving integrated chip to form a closed-loop control loop; and the microprocessor determines a driving condition of an automobile according to a steering wheel torque signal, a corner signal and a speed signal and controls the driving integrated chip to drive the brushless direct current motor to realize automobile power-assisted control, return control and damping control. In the invention, phase conversion of the brushless direct current motor is realized by using the driving integrated chip, so the burden of the microprocessor is relieved, the control real-time property is enhanced, a stop or out-of-step situation of the motor is avoided, and the safety of motor driving is improved.

Description

technical field [0001] The invention belongs to the field of electric power steering systems of automobiles, and in particular relates to a brushless motor-assisted electric power steering controller. Background technique [0002] Compared with the traditional automotive hydraulic steering system, the electric power steering system can well solve the contradiction between steering convenience and road feel, so the electric power steering system has become an inevitable trend in the development of automobile steering systems. [0003] Brushed DC motors and brushless DC motors have been maturely used in electric power steering systems, but the carbon brushes and commutators in brushed DC motors will generate sparks and carbon powder when the motor rotates, which affects the motor and electric power steering system. reliability and stability. Brushless DC motors have the advantages of small size, high power density, large low-speed torque, wide speed range, and good dynamic re...

AI Technical Summary

Problems solved by technology

[0003] Brushed DC motors and brushless DC motors have been maturely used in electric power steering systems, but the carbon brushes and commutators in brushed DC motors will generate sparks and carbon powder when the motor rotates, which affects the motor and electric power steering system. reliability and stability

Brushless DC motors have the advantages of small size, high power density, large low-speed torque, wide speed range, and good dynamic response. The phase logic is controlled by the microprocessor, which makes the control program more complicated, increases the burden on the microprocessor, and weakens the real-time performance of the controller; if the control program "runs around" phenomenon, then the brushless DC motor It will lose the commutation logic control, and the situation of stopping or losing steps will occur, which will lead to the occurrence of car danger.

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