Electric power steering system with multiple driving mode selections for commercial vehicle

Abstract

The invention discloses an electric power steering system with multiple driving mode selections for a commercial vehicle. Light / micro commercial vehicles have light or serious uncomfortable steering hand feeling when driven on different driving road surfaces and other environments, and especially under the conditions of no load and full load, the steering load resistance difference of the vehicleis large, and multiple driving modes are provided to adapt to the difference, so that a driver can select the proper steering control hand force and can meet different driving preferences of differentdrivers. Various power-assisted current characteristic curves taking different rated steering hand forces as targets are designed and developed to correspond to the different driving modes, and the power-assisted current characteristic curves are preset in a basic power-assisted module; and when the driver makes a corresponding driving mode switching instruction in a mode of combining different continuous ignition switch sequences or independently arranged gear knobs and the like in a parking state, an ECU is triggered to start the driving mode selection so as to call the expected power-assisted current characteristic curve.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and relates to an electric power steering system of a commercial vehicle, in particular to an electric power steering system with multiple driving modes with selectable steering manipulation hand force. Background technique [0002] At present, micro / light commercial vehicles such as micro-trucks, micro-faces, electric logistics vehicles, and light trucks are equipped with electric power steering systems (EPS for short). Control instructions, and can correctly feed back road surface information, so that the driver can grasp the driving state of the vehicle in time, so as to judge and make appropriate steering operation instructions. The EPS system is mainly composed of a torque angle sensor, an electronic control unit (referred to as ECU), a power steering motor (referred to as EPS motor), and a worm gear reduction mechanism. When turning, the ECU judges the steering state of the car accordi...

AI Technical Summary

Problems solved by technology

When this model is put on the market, no matter who the driver is, there is only one corresponding hand force characteristic that cannot be selected, which cannot meet the different hand force needs of the driver, so the demand cannot be met, and even affect the sales of the vehicle; at the same time, light / Micro commercial vehicles will show light or heavy uncomfortable steering feel in different environments such as driving roads, especially under the conditions of no-load and full-load, the steering load resistance of the vehicle is quite different, and it is impossible to use one The characteristics of the steering hand force are taken into account, and the current EPS system cannot provide the driver with an option to reset the desired steering hand force autonomously.

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