With the development of vehicle intelligence

the control performance of vehicle chassis systems is highly demanded. Most existing researches have adopted the single objective control strategy of the partial chassis subsystem

which cannot realize the optimization of global vehicle performance. In this paper

taking the semi-vehicle chassis system of distributed drive electric vehicle as the research object

the chassis′ longitudinal

lateral and vertically integrated control is studied. Firstly

the vehicle system dynamics model is established. Secondly

to ensure high ride comfort

braking performance and lateral stability of the vehicle

based on the principle of hierarchical control

a chassis-integrated controller based on linear quadratic optimization control is designed

aiming at the minimum integral of the weighted quadratic sum of each subsystem performance index. Meanwhile

the analytic hierarchy process is used to determine the weighted coefficient of the controller

and the integrated

coordinated optimal control of multiple chassis systems was thus realized. Finally

based on the simulation software

the suspension

braking

steering subsystem controllers are built for comparative analysis. Simulation results indicate that the vehicle′s ride comfort

braking performance and lateral stability with the proposed integrated chassis control strategy are better than those of vehicles with partial subsystem control.