Automobile electric control composite steering system and multi-objective optimization method thereof

Abstract

The invention discloses an automobile electric control composite steering system and a multi-objective optimization method thereof. The electric control composite steering system comprises an engine control unit (ECU), a mechanical drive module, an electrically controlled hydraulic power module and an electric power-assisted module. The mechanical drive module comprises a steering wheel, a steering column, a recirculating ball-type steering gear, a steering tie rod and the like; the electrically controlled hydraulic power module comprises a hydraulic tank, a hydraulic pump, a driving motor for the hydraulic pump and a rotary valve and the like; the electric power-assisted module comprises an arc-shaped linear electric motor and the like. According to the driver's preferences, road conditions, vehicle speed, steering angle and rotation speed and the like, the participation mode of the electric power-assisted of the composite steering system is determined. The motor of steering feeling, steering sensitivity and steering power consumption are taken as optimization targets and the steering range is selected as a constraint condition; the important parameters of the composite steering system are optimized through the new multi-objective optimization method and the comprehensive performance of the composite steering system is improved.

Description

technical field [0001] The invention relates to the field of automobile steering systems, in particular to an automobile electronically controlled compound steering system and a multi-objective optimization method thereof. Background technique [0002] Most of the existing steering systems use hydraulic power steering systems, electronically controlled hydraulic power steering systems and electric power steering systems. In the traditional hydraulic power steering system, the steering power is provided by the engine, and the hydraulic pump is still driven to work under non-steering conditions, and the steering condition accounts for about 10% of the driving conditions of the car, so it causes a certain waste of energy, and its The power assist characteristics are uncontrollable. When the car is at low speed, the steering is heavy, and when the car is at high speed, the steering sensitivity is too high. However, the valve-controlled electronically controlled hydraulic power ...

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Problems solved by technology

[0003] However, in the current research on the electronically controlled compound steering system, the research on its structure is still in its infancy, and there are still many imperfections that need to be improved; in addition, the electronically controlled compound steering system involves steering sense, steering sensitivity, steering performance It has a great impact on the driver's operating experience and energy saving, and there are few public reports on how to improve the car's maneuverability and economy.

[0004] In terms of optimization algorithm, the traditional multi-objective optimization algorithm has a good optimization ability, and a better Pareto solution set can be obtained by using the sorting method of retaining the elite strategy, but the algorithm itself is easy to be premature and easy to fall into the local optimal solution. Moreover, in the optimization process, as the optimal solution is approached, the optimization efficiency decreases, and there is even a problem that the optimal solution cannot be found in the end.

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