Robust design method for positional parameters of front vehicle wheels

Abstract

The invention discloses a robust design method for positional parameters of front vehicle wheels. In the method, a robust design model for the positional parameters (a king pin inclination angle, a king pin caster angle, a front wheel camber angle, and a front wheel toe-in) of the front vehicle wheels is established by taking a multibody system dynamics theory as a basis, comprehensively considering the synergic relationship among a steering system, a drive system and a suspension system, analyzing the dynamics characteristics of the positional parameters of the front wheels under motor steering, straight running, wheel hopping and other various running states, integrating uncertain factors, such as the manufacturing errors of a steering trapezoidal arm, the assembling errors of a steering knuckle, a fit clearance between a steering mechanism and the suspension system, a designed variable numerical range, the preferences of all subgoal performances and the like, and taking the minimum angle turning error, the minimum sideslip during straight running and the minimum front wheel pivot angle during wheel hopping in a steering process as optimization goals. The robust design method disclosed by the invention has the advantage of improving the design level for the positional parameters of the front vehicle wheels in China, and can be widely applied to design of various types of vehicles.

Description

Technical field: [0001] The invention is a robust design method for the positioning parameters of the front wheels of the automobile. Product technology includes virtual prototype technology, vehicle dynamics, simulation technology, robust design and other technologies. Background technique: [0002] At this stage, there are two methods for the design of automobile front wheel alignment parameters (kingpin inclination, caster, front wheel camber, front toe-in) at home and abroad, both for single system design and multi-system collaborative design. In these two methods, generally only one or two working states of the vehicle are considered, for example: wheel jumping state or steering state. In actual use, the car is often in a variety of mixed states such as straight-line driving state, wheel beating state and steering state. In order to reduce the abnormal wear of the tire and improve the handling stability of the vehicle, different dynamic characteristics of the front wh...

AI Technical Summary

Problems solved by technology

Therefore, the design method of the front wheel alignment parameters at this stage cannot meet the actual use requirements of the car.

In addition, in actual use, the alignment parameters of the front wheels of the car are affected by uncertain factors such as assembly errors and manufacturing errors. These uncertain factors change the theoretical motion law of the alignment parameters and affect the handling stability of the vehicle.

However, in the design of modern front wheel alignment parameters, only the influence of load, vehicle speed and certain manufacturing errors is generally considered, and the robustness of product design is poor.

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