A control system and control method for a small electric steering gear

Abstract

The invention discloses a control system and method of a small electric steering engine. A processor receives a target rudder-angle value, collects a current rudder-angle value, and outputs PWM signals according to the deviation, the PWM signals are amplified by a power circuit and then drive a motor to rotate, servo-actuated control for the rudder angle is realized, and the current rudder-angle value is uploaded via a bus. The servo-actuated control for the rudder angle can be realized by employing the MCU processor of high integrated level, fully utilizing internal resources and requiring fewer peripheral circuits; an H-bridge inversion circuit is added to the MCU processor of high integrated level, servo-actuated control for the rudder angle is simple and effective, and the system also has the advantages including small size, low weight, low cost and easy realization; and a general DC servo control drive circuit included in the invention can satisfy requirements for general low-power control drivers of the steering engine.

Description

technical field [0001] The invention belongs to the technical field of servo control, and in particular relates to a control system and a control method for a small electric steering gear. Background technique [0002] Existing steering gear digital controllers generally include circuits such as processors, drive circuits, isolation circuits, signal conditioning circuits, power drive circuits, H-bridge inverter circuits, bus transceivers, and DC / DC modules. Due to the limited driving capability of the PWM output port of the processor, the optocoupler cannot be directly driven, and a driving circuit needs to be added; the AD conversion accuracy inside the processor is not high, and software compensation or external expansion of the AD converter is required; the input range of the analog rudder angle Most of them are positive and negative voltages, which cannot be directly connected to the processor, and signal conditioning circuits need to be added in the front stage; when th...

AI Technical Summary

Problems solved by technology

Due to the limited driving capability of the PWM output port of the processor, the optocoupler cannot be directly driven, and a driving circuit needs to be added; the AD conversion accuracy inside the processor is not high, and software compensation or external expansion of the AD converter is required; the input range of the analog rudder angle Most of them are positive and negative voltages, which cannot be directly connected to the processor, and signal conditioning circuits need to be added in the front stage; when the number of channels for the controller to drive the steering gear increases, the volume and weight of the controller will increase a lot, and the cost will also increase a lot

[0003] In the past, the digital controller design of steering gear had the problems of large size and high cost

At present, some DSP processors dedicated to motor control have low precision internal AD converters and require software compensation, which not only increases software overhead, but also complicates the implementation of digital controllers.

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