Automobile hydraulic variable-transmission-ratio steering system and multi-objective optimization method thereof

A multi-objective optimization and variable transmission ratio technology, which is applied to automatic steering control components, steering mechanisms, steering rods, etc., can solve problems that are difficult to apply, and achieve the effect of reducing energy loss and improving steering feel

Pending Publication Date: 2018-01-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

Abroad, only German BMW has applied the purely mechanical AFS active front wheel steering system on luxury cars, but this system uses electric power assist, which can only provide limited power torque, which is difficult to apply on heavy vehicles

Method used

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  • Automobile hydraulic variable-transmission-ratio steering system and multi-objective optimization method thereof
  • Automobile hydraulic variable-transmission-ratio steering system and multi-objective optimization method thereof
  • Automobile hydraulic variable-transmission-ratio steering system and multi-objective optimization method thereof

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Embodiment Construction

[0114] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

[0115] refer to figure 1 As shown, a kind of automobile hydraulic variable transmission ratio steering system of the present invention includes: a mechanical steering module, a hydraulic power assist module, a variable transmission ratio module, and a main control module (ECU) 23;

[0116] The mechanical transmission module includes a steering wheel 1, a rotation angle sensor 2, a torque sensor 3, a steering shaft 4, a recirculating ball steering gear 25, a steering rocker arm 21, a steering straight rod 13, a steering trapezoid 14, and wheels 15;

[0117] The upper end of the steering shaft 4 is connected to the steering wheel 1, and the lower end is connected to the input end of the recirc...

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Abstract

The invention discloses an automobile hydraulic variable-transmission-ratio steering system and a multi-objective optimization method thereof. The automobile hydraulic variable-transmission-ratio steering system comprises a mechanical transmission module, a hydraulic power assisted module, a variable transmission ratio module and a main control module. Aiming at the automobile hydraulic variable-transmission-ratio steering system, mechanical structure parameters and hydraulic parameters which have a great influence on steering performance are selected as optimizing variables, and optimizing objectives are the steering road feel and energy consumption of the steering system; and under the constraint condition of steering sensitivity, multi-objective optimization is conducted through the NSGA-II genetic algorithm of the proposed mixed niche group sharing technology. According to the hydraulic variable-transmission-ratio steering system, the transmission ratio of the steering system can be adjusted according to the automobile travelling working condition, and the characteristics of flexible steering in a low speed and stable steering in a high speed are achieved. After the key parameters of the system are optimized, under the situation of guaranteeing the automobile travelling stability, the good steering road feel can be obtained, meanwhile, the energy consumption of the system is reduced, and the good comprehensive steering performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of automobile steering systems, and specifically refers to an automobile hydraulic variable transmission ratio steering system and a multi-objective optimization method thereof. Background technique [0002] With the development of power steering system, automobile steering performance has been greatly improved. At present, automobiles generally adopt hydraulic power steering system and electric power steering system, relying on an external power source to output power, making it easier for the driver to perform steering operations. Hydraulic power assist can provide a large torque, but the power assist torque cannot be adjusted precisely and the system consumes a lot of energy; electric power assist can realize that the power assist characteristics change with the driving conditions, but due to electrical safety restrictions, the amount of power assist provided is also limited. Whether it is hydraulic powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/06G06F17/50B62D6/00B62D101/00B62D113/00B62D119/00B62D123/00B62D137/00
Inventor 周小川赵万忠张子俊赵宏宇栾众楷王春燕
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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