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The mountainous roads are very complex and changeable. When commercial vehicles are driving in mountain areas, the using of brakes can not only reduce the fuel economy, but also increase the brake wear. The aim of this system is utilizing the terrain changes of mountainous roads to guide the driver to control the accelerator pedal reasonably through the mutual transformation of kinetic energy and gravitational potential energy for reducing the energy loss caused by braking on downhill road. The theoretical control points of releasing the accelerator pedal on the uphill road are determined based on the road digital elevation model (DEM) information and the vehicle dynamic model.

The authors of this paper investigated the influences of fuel supply timing delay on fuel consumption maxmum combustion pressure, NOx emission and smoke of two diesel engines with shallow type combustion system Based on measured, indicator diagram, combustion rate and NOx emission were predicted by using phenomenological combustion model. Furthermore, theoritical of the test result were made.