Stroke identifying unit of a four-stroke engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsRyutaro Yamazaki, Nobuhiko Ito, Yasuo Iwata
Life of this patent
Estimating the term…
Abstract
A stroke identifying unit, for an electronic fuel injection control system of an engine, can identify cylinder strokes without detection of the rotation of the engine's camshaft. The stroke identifying unit includes a crank pulse generator for detecting a phase of a crankshaft of the engine. In a four cylinder engine, an intake pressure sensor detects the combined intake pressures in the second to fourth intake pipes, communicating with the second to fourth cylinders. A fuel injection control unit identifies strokes of the first to fourth cylinders on the basis of a relationship between the detected phase of the crankshaft and the detected intake pressures.
Claims20
A stroke identifying unit of a four-stroke engine comprising:
- a phase detector for detecting a phase of a crankshaft of the engine;
- a first intake pressure sensor for detecting an intake air pressure in a first intake pipe communicating with a first cylinder of the engine;
- and
- a stroke identifier for distinguishing strokes of the first cylinder based upon a relationship between the detected phase of the crankshaft and the detected intake pressure in the first intake pipe.
A fuel injected engine comprising:
- an engine block;
- a crankshaft disposed in said engine block;
- an encoder attached to said crankshaft;
- a reader proximate said crankshaft for detecting said encoder and for generating a position signal in response to detecting said encoder;
- a plurality of cylinders in said engine block;
- a plurality of intake paths, each communicating with a respective one of said plurality of cylinders;
- a plurality of pressure sensors, each communicating with a respective one of said plurality of intake paths, and each generating a pressure signal representative of a pressure with the respective cylinder;
- a plurality of fuel injectors, each communicating with a respective one of said plurality of intake paths;
- and
- a control unit for receiving said position signal and said pressure signals, and for controlling an injection timing of said plurality of fuel injectors.
A method of distinguishing a stoke of a cylinder of an engine comprising:
- providing a phase detector;
- providing a first intake pressure sensor;
- providing a stroke identifier;
- detecting a phase of a crankshaft of the engine;
- detecting an intake air pressure in a first intake pipe communicating with a first cylinder of the engine;
- and
- distinguishing strokes of the first cylinder based upon a relationship between the detected phase of the crankshaft and the detected intake pressure in the first intake pipe.
Dependencies are inferred from the claim text.