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In intelligent vehicle (IV) which traction is provided only by traditional fuel engine, drive force is usually controlled through throttle control. Firstly, vehicle longitudinal mathematic model based on medium-level complex engine model was given. Then, aim at engine's strong non-linearity, pure time delay and parameters time-variety properties, the complicated plant controller automatic design method based on fuzzy logic (FL) and genetic algorithm (GA) was used to design the fuzzy throttle controller. Simulations were done at last. The results show that the controller can meet IV longitudinal control performances of high precision, strong robustness and good smoothness.