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US 10,859,055 B1Granted
Method for starting an engine
AssigneeFord Global Technologies, LLC
InventorsJeffrey Allen Doering, Alexander O'Conor Gibson, Brad Alan VanDerWege
Life of this patent
Estimating the term…
Abstract
A method for starting an engine is disclosed. The method may adjust exhaust valve opening timing of one or more cylinders during a first cycle of an engine since a most recent engine stop to reduce engine cranking work. The method may adjust exhaust valve timing if the engine is directly started or started via an electric machine.
Claims20
A vehicle system, comprising:
- an engine;
- and
- a controller including executable instructions stored in non-transitory memory to adjust an exhaust valve opening timing of a cylinder of the engine to a crankshaft angle at which a pressure in the cylinder is expected to be within a predetermined pressure of a pressure in a crankcase of the engine when combustion does not occur in the cylinder before a first exhaust stroke of the cylinder after a most recent engine stop.
An engine operating method, comprising:
- adjusting an exhaust valve opening timing of a cylinder of an engine to a crankshaft angle at which a pressure in the cylinder is within a predetermined pressure of a pressure in a crankcase of the engine during engine cranking via a controller in response to an engine start request;
- and
- cranking an engine in response to the engine start request.
An engine operating method, comprising:
- initiating expansion stroke combustion in a cylinder of an engine for a first cycle of the cylinder since a most recent engine stop via a controller in response to a request to start an engine;
- adjusting an exhaust valve opening timing of a cylinder to a crankshaft angle at which an estimated pressure in the cylinder is within a predetermined pressure of a pressure in a crankcase of the engine during engine cranking via the controller;
- and
- cranking an engine in response to the engine start request.
1 more element
Dependencies are inferred from the claim text.