Patent ID: 6044317
Filing Date: 2000-03-28
Classification: F16H,Y10T

Abstract:
Method of elimination of the phenomenon of pumping of a motor vehicle with automatic transmission, by elaboration of a signal preventing change from a higher ratio, intended to be applied to a transmission control system, characterized in that:the weight of the vehicle is determined by using the measured speed of the vehicle, the current transmission ratio, the engine speed and the angle of opening of the engine throttle valve, and taking into account the state of the brakes,the acceleration that the vehicle would experience on a higher transmission ratio is determined from the weight of the vehicle,the sum of the resistant forces applied to the vehicle is determined,the possibility of having a pumping phenomenon on the higher ratio transmission, called ""pumping risk,"" is determined from the information on acceleration and resistant forces, andthe prevention signal is elaborated from the ""pumping risk"" information.