Engine autostop and autorestart control
AssigneeFord Global Technologies, LLC
InventorMathew Alan Boesch
Life of this patent
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Abstract
Systems and methods are described for controlling engine operation of an engine that may be shut-down during engine idle stop conditions. The engine may include a high pressure direct injection fuel system. In one embodiment, a method stops the engine when a temperature of a fuel rail is below a threshold during a selected engine idle stop condition. On the other hand, when the temperature of the fuel rail is above the threshold, engine operation is maintained during the selected engine idle stop condition.
Claims4
An engine control apparatus for controlling operation of an engine that may be shut-down during engine idle stop conditions, the engine including a high pressure direct injection fuel system, the engine control apparatus comprising an engine controller configured to:
- during at least a first fuel rail temperature below a threshold, automatically stopping engine operation during selected engine idle stop conditions;
- and
- during at least a second fuel rail temperature above the threshold, shutting down a high pressure fuel pump for pressurizing a high pressure fuel rail, continuing direct fuel injection into engine cylinders, and disabling the automatic stopping of the engine until fuel rail pressure falls below a threshold pressure.
Dependencies are inferred from the claim text.