Method and system of cleaning a control valve
AssigneeFord Global Technologies, LLC
InventorsBrian David Eves, Shane Keilthy, Mike Acton, Tom Leroy
Life of this patent
Estimating the term…
Abstract
A method and system of cleaning a turbocharger bypass control valve, the control valve being operable to vary the position of a bypass valve and thereby vary the amount of flow bypass across a turbine and/or compressor of a turbocharger for an engine. The method comprises: determining whether the control valve may require cleaning; adjusting the duty cycle of the shuttle so as to increase a flow of fluid through the control valve and clean the control valve; and adjusting a throttle position of the engine and thus the engine torque output to compensate for the adjustment in the amount of boost provided by the turbocharger.
Claims20
A method of cleaning a turbocharger bypass control valve, the control valve being operable to vary a position of a bypass valve and thereby vary an amount of flow bypass across a turbine or compressor of a turbocharger for an engine,
- wherein the control valve is in fluidic communication with a fluid at a first reference pressure and a fluid at a second reference pressure, the control valve comprising a movable shuttle configured to selectively transmit the first reference pressure or second reference pressure such that a duty cycle of the shuttle determines an output pressure of the control valve, the position of the bypass valve being determined by an output pressure of the control valve,
- wherein the method comprises:
- determining whether the control valve requires cleaning;
- adjusting the duty cycle of the shuttle so as to increase a flow of fluid through the control valve and clean the control valve;
- and
- adjusting a throttle position of the engine and thus an engine torque output to compensate for an adjustment in an amount of boost provided by the turbocharger.
A system for cleaning a turbocharger bypass control valve, the control valve being operable to vary a position of a bypass valve and thereby vary an amount of flow bypass across a turbine and/or compressor of a turbocharger for an engine,
- wherein the control valve is in fluidic communication with a fluid at a first reference pressure and a fluid at a second reference pressure, the control valve comprising a movable shuttle configured to selectively transmit the first reference pressure or second reference pressure such that a duty cycle of the shuttle determines an output pressure of the control valve, the position of the bypass valve being determined by an output pressure of the control valve,
- wherein the system comprises one or more controllers configured to:
- determine whether the control valve requires cleaning;
- adjust the duty cycle of the shuttle so as to increase a flow of fluid through the control valve and clean the control valve;
- and
- adjust a throttle position of the engine and thus an engine torque output to compensate for the adjustment in an amount of boost provided by the turbocharger.
An engine method, comprising:
- adjusting a boost-pressure-actuated wastegate based on operating conditions to increase flow to an actuating chamber of the wastegate control valve responsive to requested valve cleaning of the wastegate control valve while compensating for wastegate flow and boost changes by adjusting an engine intake throttle.
Dependencies are inferred from the claim text.