Systems and methods for preventing engine stall
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for reducing or avoiding engine hesitation and/or stall during engine idle conditions. In one example, a method may include inferring an engine idle condition, and in response, controlling a speed of an engine to a compensated engine idle speed that is a function of an extent to which a canister purge valve that regulates an amount of fluid flow to the engine from a fuel system and/or an evaporative emissions system, is degraded. In this way, an amount of fuel utilized to compensate for the degraded canister purge valve may be proportionate to the extent to which the canister purge valve is degraded.
Claims20
A method comprising:
- inferring an engine idle condition, and in response, controlling a speed of an engine to a compensated engine idle speed that is a function of an extent to which a canister purge valve that regulates an amount of fluid flow to the engine from a fuel system and/or an evaporative emissions system, is degraded.
A method for a hybrid electric vehicle comprising:
- inferring an idle stop event and under conditions where a canister purge valve that regulates a fluid flow from a fuel system and an evaporative emissions system to an engine is degraded, determining a fuel vaporization rate of a fuel stored in the fuel system in relation to a threshold fuel vaporization rate;
- and
- controlling the engine based on the fuel vaporization rate and an extent to which the canister purge valve is degraded.
A system for a vehicle, comprising:
- a canister purge valve that controls an amount of air and fuel vapor routed to an engine from a fuel system and an evaporative emissions system;
- and
- a controller with computer readable instructions stored on non-transitory memory that when executed cause the controller to:
- responsive to an indication that the canister purge valve is degraded and further in response to an engine idle condition being inferred, controlling an engine speed to a compensated engine idle speed as a function of an extent to which the canister purge valve is degraded and a vacuum level in an intake manifold of the engine.
Dependencies are inferred from the claim text.