Variable-transmission-ratio circulating ball type electro-hydraulic steering system and control method thereof

Abstract

The invention discloses a variable-transmission-ratio circulating ball type electro-hydraulic steering system and a control method thereof. The variable-transmission-ratio circulating ball type electro-hydraulic steering system comprises a steering wheel module, a variable-transmission-ratio hydraulic power assisting module, a mechanical transmission module, a motor power assisting module and a main controller module. According to the electro-hydraulic steering system, different motor power-assisted modes can be selected according to transmission ratio signals of different working conditions, steering is controlled through coordination of the hydraulic power-assisted motor and the electric power-assisted motor, the magnitude of steering power can be adjusted along with the transmission ratio signals of harmonic rotation angles, the three advantages of fast electric response, large hydraulic assistance and good variable transmission ratio stability are fused, the response speed is increased, the anti-interference capability is enhanced, and the overall energy consumption is reduced to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of automobile steering systems, and in particular relates to a variable transmission ratio circulating ball type electro-hydraulic steering system and a control method thereof. Background technique [0002] With the development of vehicle control technology and people's higher and higher requirements for driving safety and comfort; the hydraulic power steering system can no longer meet the new requirements due to problems such as inability to realize active control and non-adjustable steering power characteristics. Although the electric power steering system can solve the above problems, it has the disadvantage of insufficient power assistance in the application of medium and heavy commercial vehicles, and the current electronically controlled hydraulic steering system still has large energy consumption, slow response speed, and poor road feel. and other shortcomings. Therefore, the research on the composit...

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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a variable transmission ratio recirculating ball type electro-hydraulic steering system and its control method to solve the problem of the fixed transmission ratio of the existing commercial vehicle steering system and the transmission efficiency of the hydraulic power steering system. Low, poor road feel and slow response

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