Patent ID: 7987934
Filing Date: 2011-08-02
Classification: B60K,B60L,B60W,Y02T

Abstract:
1. Method for controlling operation of a hybrid powertrain, the hybrid powertrain comprising an internal combustion engine, an energy storage system, an electric machine, and an electro-mechanical transmission, the energy storage system and electric machine electrically-operatively coupled for power flow therebetween; and, the engine, electric machine, and the electro-mechanical transmission mechanically-operatively coupled to transmit power therebetween to generate a power flow to an output member, the method comprising: determining optimum engine operation, a maximum engine speed ramp rate, and an operator torque request; monitoring states of parameters of the electrical energy storage device; determining a limit to the engine speed ramp rate based upon the optimum engine operation, the maximum engine speed ramp rate, and the states of the parameters of the electrical energy storage device; determining power limits of the energy storage device based upon the states of the parameters of the energy storage device; adjusting the limit to the engine speed ramp rate based upon the power limits of the energy storage device; and, controlling engine operation based upon the maximum engine speed ramp rate and the adjusted limit to the engine speed ramp rate.