Patent ID: 6629025
Filing Date: 2003-09-30
Classification: B60K,B60L,B60W,Y02T,Y10S,Y10T

Abstract:
A surge suppression control method for a motor vehicle powertrain including an engine coupled to a driveline through an electric machine and a multiple speed ratio transmission, the control method comprising the steps of:measuring a rotary speed of said engine; determining a natural resonant frequency of said driveline based on a current speed ratio of said transmission; filtering the measured rotary speed based on the determined natural resonant frequency to produce a speed oscillation signal representing an oscillatory component of the measured rotary speed in a predetermined range of frequencies substantially centered on said determined natural resonant frequency; differentiating said speed oscillation signal to form a corresponding acceleration oscillation signal; and inverting said acceleration oscillation signal to form a torque command for said electric machine.