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US 2013/0276756 A1Published application
Reducing intake manifold pressure during cranking
AssigneeFord Global Technologies, LLC
InventorsThomas G. Leone, Ross Dykstra Pursifull
Life of this patent
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Abstract
Embodiments for starting an engine are provided. In one embodiment, an engine control method comprises, during engine cranking, commencing fuel injection when intake manifold pressure drops below a threshold, the threshold based on fuel volatility. In this way, the stability of engine starts using low volatility fuels may be increased.
Claims20
An engine control method, comprising:
- during engine cranking, commencing fuel injection when intake manifold pressure drops below a threshold, the threshold based on a fuel volatility.
An engine system comprising:
- a vacuum source coupled to an intake manifold;
- a fuel injection system;
- a positive crankcase ventilation system including a PCV valve;
- and
- a controller including instructions to:
- during cranking of the engine, close the PCV valve and operate the vacuum source to reduce intake manifold pressure, and
- commence fuel injection when the intake manifold pressure reaches a threshold, said threshold decreasing for lower fuel volatility.
4 more elements
An engine control method, comprising:
- if fuel ethanol content is equal to or below a threshold, then cranking the engine and commencing fuel injection after uniquely identifying engine position;
- and
- if fuel ethanol content is above the threshold, then cranking the engine and commencing fuel injection based on intake manifold pressure.
Dependencies are inferred from the claim text.