Methods and Systems for Engine Control
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Gopichandra Surnilla
Life of this patent
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Abstract
Methods and systems for controlling an engine are provided. In some examples, the engine has at least a cylinder and a compression device coupled to an intake of the engine, and the method includes, during engine re-start operation of an engine idle-stop condition, commencing combustion in the cylinder from a non-combusting condition, the combustion in a two-stroke combustion cycle of the cylinder. However, in some examples, at least partially electrically powered boosting operation may also be used to extend the two-stroke operation during a start.
Claims20
A method of starting an engine, the engine having at least a cylinder and a compression device coupled to an intake of the engine, the method comprising:
- during engine re-start operation of an engine idle-stop condition, commencing combustion in the cylinder from a non-combusting condition, the combustion in a two-stroke combustion cycle of the cylinder.
A method of starting an engine of a vehicle, the engine having a plurality of cylinders and a compression device coupled to an intake of the engine, the compression device driven at least partially by an electric machine, the method comprising:
- generating boost in the intake by driving the compressor with at least the electric machine during engine starting;
- and
- commencing combustion in each of the plurality of cylinders from a non-combusting condition, the combustion in a two-stroke combustion cycle of the cylinder, each cylinder performing exactly one combustion event in the two-stroke combustion cycle;
- and
- transitioning each cylinder to a four-stroke combustion cycle for a next combustion event following the exactly one combustion event;
- maintaining combustion in each cylinder in the four-stroke combustion cycle until boost pressure rises above a threshold during the engine start;
- and then
- returning each cylinder to the two-stroke combustion cycle.
A method of starting an engine, the engine having at least a cylinder and a compression device coupled to an intake of the engine, the compression device driven at least partially by an electric machine, the method comprising:
- generating boost in the intake by driving the compressor with at least the electric machine during engine starting, the electric machine driving the compressor during engine cranking of the engine and before a first combustion event in the cylinder, the first combustion event in the cylinder being a first combustion event from engine rest;
- adjusting the electric machine based on an engine temperature during the start and based on a battery state of charge;
- inducting air during the start into the cylinder through at least one poppet valve coupled to the cylinder;
- adjusting a fuel injection amount based on the electric machine operation;
- and
- commencing combustion in the cylinder from a non-combusting condition, the combustion in a two-stroke combustion cycle of the cylinder, the non-combusting condition being a vehicle stopped and engine stopped condition, where the engine is automatically shut-down during stopped vehicle conditions independent from a vehicle operator shut-down request.
Dependencies are inferred from the claim text.