Determination of wastegate valve position
AssigneeFord Global Technologies, LLC
InventorsYan Wang, Hamza Derbas, Vladimir V. Kokotovic, Dimitar Petrov Filev, Eric Luehrsen
Life of this patent
Estimating the term…
Abstract
Various methods for determining the fully closed position of a wastegate valve are provided. In one example, a non-closed position command for a wastegate valve in a low-lift region relative to a valve seat is received. Prior to executing the position command, the wastegate valve is only temporarily closed to thereby determine a fully closed position.
Claims20
A method for operating a turbocharger wastegate valve of an internal combustion engine, comprising:
- receiving data from one or more sensors via a controller;
- commanding receiving a non-closed position command for the turbocharger wastegate valve via the controller;
- and
- prior to executing the position command in response to any one of a fluid flow upstream of a compressor of the turbocharger, fuel, a temperature and a time associated with the current fully closed position, a rate of change of desired torque, an engine revolution rate and an engine load, and a threshold duration and a threshold change in temperature, and a residence time, only temporarily closing the turbocharger wastegate valve to determine a current fully closed position via the controller.
A turbocharger system in an internal combustion engine comprising:
- a turbocharger including a wastegate valve;
- and
- a controller including executable instructions stored in non-transitory memory to
- close the wastegate valve to determine a current fully closed position of the wastegate valve prior to execution of a position command for the wastegate valve if a position command for the waste gate valve corresponds to a first lift region, but not a second lift region, relative to a valve seat;
- and
- execute the position command if the position command does not correspond to the first lift region in response to any one of a rate of change of desired torque, an engine revolution rate, an engine load, and a rate of change of desired torque, and a residence time.
The turbocharger system of claim of 13, wherein the actuator is one of a pneumatic actuator and an electric actuator.
A turbocharger system in an internal combustion engine comprising:
- a turbocharger including a wastegate actuator and a wastegate valve;
- and
- a controller including executable instructions stored in non-transitory memory to
- adjust the wastegate actuator responsive to a desired and actual wastegate valve position, including
- temporarily actuating the wastegate valve to a fully closed state when the wastegate valve is commanded to a non-fully closed position greater than a lower threshold but smaller than an upper threshold;
- and
- further adjusting the wastegate actuator based on the actual wastegate valve position at the fully closed state.
Dependencies are inferred from the claim text.