Patent ID: 7221062
Filing Date: 2007-05-22
Classification: B60K,B60L,Y02T

Abstract:
1. A method for controlling a hybrid drive system with an intermediate circuit and an energy accumulator, the energy accumulator being connected to the intermediate circuit via a switching device, the switching device including a diode with a forward direction toward the intermediate circuit and a transistor, adapted to be turned on and off, arranged parallel to the diode and including a forward direction toward the energy accumulator, wherein the transistor is turned off and the diode is forward-biased for discharging the energy accumulator and the transistor is turned on and the diode is reverse-biased for charging the energy accumulator, that the method comprising: turning the transistor off and blocking the diode to disconnect the energy accumulator when it is neither to be charged nor discharged; and bringing the voltage across the intermediate circuit to a level of the voltage across the energy accumulator and then turning the transistor on to charge the energy accumulator.