Patent ID: 6825624
Filing Date: 2004-11-30
Classification: H02P

Abstract:
A method of maintaining a vehicle in a stopped position on an incline comprising the steps of:coupling a machine with at least a first phase, a second phase, and a third phase to at least one drive wheel of the vehicle; selectively supplying energy to the first phase, the second phase and the third phase with a pulse width modulated inverter having at least a first half-bridge coupled to the first phase, a second half-bridge coupled to the second phase, and a third half-bridge coupled to the third phase; and maintaining a torque in the machine at an approximately zero rotational speed by switching the inverter between one of: a mode 1 for a first percentage of a pulse width modulated switching period and a mode 7 for a remaining percentage of the pulse width modulated switching period; a mode 2 for the first percentage of the pulse width modulated switching period and the mode 7 for the remaining percentage of the pulse width modulated switching period; and a mode 6 for the first percentage of the pulse width modulated switching period and the mode 7 for the remaining percentage of the pulse width modulated switching period.