Motor control circuit and electric steering engine system

Abstract

The invention discloses a motor control circuit and an electric steering engine system. The motor control circuit comprises a driving circuit, a detection circuit and a control circuit. The driving circuit is used for driving the motor; the detection circuit is used for detecting the driving current of the motor by using a current sampling resistor and converting the driving current into a voltage signal; and detecting the ground level of a circuit where the circuit is located, and taking the ground level as a reference voltage; and the control circuit is used for subtracting the reference voltage from the voltage signal to obtain a voltage calibration value and converting the voltage calibration value into a driving current calibration value so as to regulate and control the driving circuit according to the driving current calibration value. Therefore, the current sampling resistor is used for detecting the driving current of the motor, compared with a Hall current sensor which has low time delay, the transient response capability is high, and dynamic monitoring of the driving current of the motor is facilitated; moreover, the ground level of the circuit is detected and is used as a reference voltage so that precision calibration is carried out on a voltage signal converted from the driving current, and the detection precision of the driving current is effectively improved.

Description

technical field [0001] The invention relates to the field of electric steering gear, in particular to a motor control circuit and an electric steering gear system. Background technique [0002] The motor control circuit in the electric steering gear system includes a current detection circuit, a control circuit and a drive circuit; among them, the current detection circuit is used to detect the driving current of the motor; The drive current adjustment is used to drive the drive circuit of the motor so that the drive current of the motor reaches the target drive current; when the drive current of the motor is overcurrent, the drive circuit is controlled to stop working to stop the motor. [0003] At present, in order to improve the motor closed-loop control of the electric steering gear system, the demand for detection of the motor drive current is increasing, and most of them require more accurate and timely detection of the motor drive current. In the prior art, there are...

AI Technical Summary

Problems solved by technology

However, the electromagnetic environment where the Hall current sensor is located is relatively complex, which greatly affects the accuracy and reliability of current detection; moreover, because the working mechanism of the Hall current sensor itself has an electric-magnetic-electric conversion process, the Hall current sensor There is at least a 5μs time delay between the input and output of the motor, which is not conducive to the dynamic monitoring of the motor drive current

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