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The mass of very small vehicles is often comparable to that of their drivers,and thus there is a greater degree of coupling between the vehicle and the driver,compared with a case for traditional vehicles.When develo-ping small vehicles,it is necessary to give ample consideration to the dynamics of the person who ride them.Here, a model of a human body riding a small personal vehicle was constructed to investigate the dynamics of the person inside such a vehicle.Moreover,an experiment on posture maintenance by acceleration of direction of travel was conducted and the parameters for posture control were identified using a genetic algorithm.Results shows that body behavior could be successfully simulated using the proposed model,and the control parameters were effective in determining the posture maintenance characteristics of the vehicle occupant.