Patent ID: 7753657
Filing Date: 2010-07-13
Classification: F02D,F02M,F04B,Y02T

Abstract:
1. A method of displacing a pumping assembly comprising the steps of: (a) energizing a coil assembly by applying a first current in a first direction through the coil assembly to displace a drive assembly from an initial position towards an actuated position, to cause, at least in part, a first pumping motion; (b) returning the drive assembly to the initial position by applying a second current in a second direction through the coil assembly to cause, at least in part, a second pumping motion; (c) while returning the drive assembly to the initial position, energizing the coil assembly by applying a third current in the first direction through the coil assembly to decelerate the drive assembly before it reaches the initial position; (d) providing a first delay between application of the first current and application of the second current; and (e) providing a second delay between application of the second current and application of the third current.