Abstract: The optimum valve generator is set up by the radial basis function network and fuzzy controller is given for variable valve timing (VVT) system of automotive engine. It has been proved by vehicle road test that the system has a better static and dynamic performance, and good reliability. The equal speed fuel consumption of automobile is reduced by 10% over no-install VVT at high speed. The acceleration time on direct speed is reduced by 4.8% over no-install VVT. The minimal stabile speed of automobile is reduced by 8.3% over no-install VVT.

Key words: Automotive engine, Intelligent control, Variable valve timing (VVT)