Intelligent electric power steering system of commercial vehicle

Abstract

The invention discloses an intelligent electric power steering system of a commercial vehicle, and relates to the field of vehicle steering systems. The system is composed of a novel steering engine,a high-rotating-speed high-power motor and a high-voltage motor controller, wherein the motor controller and the motor are integrally designed to be in the same shell or in different shells that are connected, communication and power lines of the motor and the controller are internal connecting lines, a sensor and a connector are integrated on a steering engine shell, so that wiring harnesses areomitted, and the structure is simplified; the space and the weight are effectively reduced; a high-speed switched reluctance motor is designed and used for the motor, so that the size of the motor isreduced, and the cooling performance of the motor is improved; a third-generation semiconductor silicon carbide power device is adopted as motor controller hardware, so that switching loss is reduced,and the size and the mass of the controller are reduced; and a high-pressure high-rotating-speed motor driving system composed of the motor and the controller directly drives the steering engine, compared with hydraulic power assisting, the structure is simple, the efficiency is high, sealing pieces such as an oil seal, an oil way and an oil cylinder are omitted, the structure is simplified, andspace and weight are saved.

Description

technical field [0001] The invention relates to the field of automobile steering systems, in particular to an intelligent electric power steering system for commercial vehicles. Background technique [0002] At present, the steering system used in new energy commercial vehicles of 3.5 tons and above is composed of a recirculating ball steering gear, a steering control mechanism, a steering control valve, a steering oil pump, a steering oil tank, a steering hydraulic oil circuit, an oil pump drive motor and a controller system. , high-voltage wires and their connectors. [0003] This kind of steering system mainly has the following problems: 1. The system is complex and the components are separated, occupying a large layout space of the whole vehicle, and the weight is heavy, which especially affects the key index of energy consumption per unit load (Ekg) of new energy commercial vehicles. ; 2. When the vehicle is powered on at high voltage and high speed does not require po...

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Problems solved by technology

[0003] This kind of steering system mainly has the following problems: 1. The system is complex and the components are separated, occupying a large layout space of the whole vehicle, and the weight is heavy, which especially affects the key index of energy consumption per unit load (Ekg) of new energy commercial vehicles. ; 2. When the vehicle is powered on at high voltage and high speed does not require power assistance, that is, when there is no steering demand, the oil pump continues to work. The speed of the oil pump cannot be adjusted according to the actual working conditions, which increases energy consumption and affects electric vehicles. cruising range

[0005] However, in addition to the above-mentioned problems, the current system also has the following problems: 1. The system is more complex and has redundant functions; 2. The oil pump drive motor and controller system and the steering wheel control system cannot communicate to achieve coordinated control

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