Electronic control fluid-link steering system for heavy-duty vehicle and control method thereof

Abstract

The invention provides an electronic control fluid-link steering system for a heavy-duty vehicle and a control method thereof. The steering system comprises an engine, a slip type electromagnetic clutch, a steering oil pump, a steering valve, and a power cylinder, wherein the steering valve is connected with a steering wheel through an angle sensor. The steering system further comprises an electronic control unit (ECU) connected with the slip type electromagnetic clutch and the angle sensor. By the adoption of the invention, when a vehicle performs pivot steering or low-speed steering, the electromagnetic clutch is jointed completely and the steering oil pump runs at a high speed along with the engine, so as to provide large assistant force and meet the requirements on convenience of low-speed steering; when the vehicle performs high-speed steering, the electromagnetic clutch is jointed partially and the steering oil pump runs at low speed, so that small assistant force can be provided, the requirements on operating stability at high speed can be met, the engine load is reduced and other power consumptions are reduced; and when no steering is performed, the ECU outputs extremely small current, and the steering oil pump runs at extremely low rotating speed, so that the power consumption of the engine can be extremely lowered.

Description

technical field [0001] The invention relates to the technical field of automobile steering, in particular to an electronically controlled hydraulic steering system for a heavy vehicle and a control method thereof. Background technique [0002] At present, the heavy-duty vehicles produced by automobile manufacturers at home and abroad all use hydraulic power steering systems with fixed power-assist characteristics. The power-assisted characteristics of this type of steering system are determined by the structural parameters of the servo rotary valve and the oil supply of the oil pump, which cannot solve the problem of low-speed steering portability. and high-speed steering stability; and the hydraulic power system consumes a lot of energy, accounting for about 3% of the vehicle's fuel consumption. [0003] In recent years, with the continuous application of electronic technology in automobile steering systems, new steering systems such as electronically controlled hydraulic p...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the existing steering system has the following technical problems: the hydraulic power steering system cannot take into account the steering portability and handling stability and has high energy consumption, and the electronically controlled hydraulic steering system based on the bypass valve throttle adjustment cannot solve the problem High problem, electrohydraulic power steering system and electric power steering system based on electric pump cannot meet the high steering power requirements of heavy vehicles

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