Patent ID: 9169834
Filing Date: 2015-10-27
Classification: F04B,F04D

Abstract:
1. A method to control a coolant pump of a motor-vehicle engine system, the method comprising: when engine temperature is below a threshold, the threshold determined by an electronic control system, driving a coupling-control pump of the coolant pump in a first direction to reduce an amount of fluid confined between a drive wheel and a driven wheel of the coolant pump, the driven wheel connected to a coolant impeller and coupled by a variable degree to the drive wheel, the degree of coupling responsive to the amount of fluid confined between the drive wheel and the driven wheel; when the engine temperature is above the threshold, ceasing to drive the coupling-control pump in the first direction to increase the amount of fluid confined between the drive wheel and the driven wheel of the coolant pump; and transmitting rotational energy to the coupling-control pump via a mechanical transmission linkage arranged between the coupling-control pump and the driven wheel in response to a rotation speed difference between the drive wheel and the driven wheel.