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In this paper, an automobile factory G project vehicle dynamics modeling and simulation of the subject , first establish a MPV car 's front double wishbone torsion bar spring independent suspension , and after a single oblique arm using ADAMS / Car coil spring independent suspension , and the kinematics simulation analysis , the wheel alignment parameters , beating itinerary changes between tread, suspension stiffness , suspension stiffness of the roll angle with the center of the wheel , the inadequate performance of the front suspension improvements analysis . On the basis of the analysis of the performance of front and rear suspension , according to the CAD data of the vehicle , including the steering system, front and rear tires , front stabilizer bar , body , power systems , subsystems , and calculated for each subsystem freedom degrees, after commissioning reasonable assembled vehicle dynamics simulation model , manipulated with reference to national stability standard Test Method for setting simulation parameters , the steady circular step input of steering wheel angle and steering back positive and simulation analysis , respectively, after the reference the national standard evaluation scoring . Found in the simulation analysis of steady-state rotation of the MPV cars understeer amount is too large for the list can be reduced understeer amount of factors improved analysis, finalized by changing the front suspension alignment parameters . increase the stiffness of the coil spring , change the position of the tie rod and to reduce stabilizer bar torsional stiffness improvements to increase the degree of understeer count score . In summary , this paper established a MPV vehicle dynamics simulation model and preliminary simulation analysis , for MPV car early prototype further improved to provide a reference .
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