Compression self-igniting gasoline engine

Details Compression self-igniting gasoline engine Compression self-igniting gasoline engine

2000-05-11

2001-07-31

Solis, Erick (Department: 3747)

Internal-combustion engines

Combustion chamber means having fuel injection only

Having a particular relationship between injection and...

C123S299000, C123S090150

Reexamination Certificate

active

06267097

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a gasoline engine which performs compression self-ignition combustion.
BACKGROUND OF THE INVENTION
Tokkai Hei 7-332141 published by the Japanese Patent Office in 1995 discloses a gasoline engine which is made to perform self-ignition to improve heat efficiency.
In this engine, gasoline fuel is injected into an intake port to form a premixed fuel mixture, and causes self-ignition by compressing the premixed fuel mixture with the high compression ratio of a direct injection diesel engine, i.e., 14 to 20. As self-ignition occurs at plural locations in the combustion chamber, the combustion period can be shortened, even in the case of an fuel mixture having a lean air-fuel ratio, compared with the case where spark ignition is performed. For this reason, running at a lean air-fuel ratio which was impossible in a spark ignition engine can be performed, and fuel consumption can be largely reduced.
This engine is further equipped with a spark plug, and performs spark ignition under running conditions which demand a fuel mixture in the vicinity of the stoichiometric air-fuel ratio, such as running on full load.
SUMMARY OF THE INVENTION
However, if the compression ratio is increased, when spark ignition is performed in an fuel mixture in the vicinity of the stoichiometric air-fuel ratio, knocking easily occurs. In order to avoid knocking, it is necessary to limit the advance of the ignition timing. However, limiting the advance of the ignition timing largely reduces the generated torque compared with a spark ignition gasoline engine of ordinary compression ratio.
It is therefore an object of this invention to decrease the compression ratio of a gasoline engine which uses compression self-ignition and spark ignition in conjunction.
It is a further object of this invention to improve the condition in a combustion chamber of a gasoline engine for performing compression self-ignition.
In order to achieve the above objects, this invention provides a compression self-igniting gasoline engine wherein stroke cycles comprising an intake stroke, a compression stroke, a power stroke and an exhaust stroke are repeated sequentially by a piston, and self-ignition of a fuel mixture is performed by compression of the fuel mixture in the compression stroke. The engine comprises a fuel injector facing the combustion chamber, an intake valve which introduces intake air to the combustion chamber, an exhaust valve which ejects burnt gas from the combustion chamber, a sensor which detects the strokes of the piston, a valve timing adjustment mechanism which varies an open/close timing of the intake valve and the exhaust valve, and a microprocessor. The microprocessor is programmed to control the valve timing adjustment mechanism so that a sealed period when both the exhaust valve and the intake valve are closed, appears near top dead center of the exhaust stroke and control the fuel injection timing of the fuel injector so that the fuel is injected into the combustion chamber in the sealed period.
This invention also provides a compression self-igniting gasoline engine comprising a fuel injector facing the combustion chamber, an intake valve which introduces intake air to the combustion chamber, an exhaust valve which ejects burnt gas from the combustion chamber, a mechanism for detecting the strokes of the piston, a mechanism for varying an open/close timing of the intake valve and the exhaust valve, a mechanism for controlling the valve timing adjustment mechanism so that a sealed period when both the exhaust valve and the intake valve are closed, appears near top dead center of the exhaust stroke, and a mechanism for controlling the fuel injection timing of the fuel injector so that the fuel is injected into the combustion chamber in the sealed period.


REFERENCES:
patent: 5517954 (1996-05-01), Melchior
patent: 5746163 (1998-05-01), Green
patent: 5865153 (1999-02-01), Matsumoto
patent: 6067954 (2000-05-01), Kudou et al.
patent: 6112716 (2000-09-01), Tachibana
patent: 6125816 (2000-10-01), Inoue
patent: 0 943 793 (1999-09-01), None
patent: 7-332141 (1995-12-01), None
patent: 9-203307 (1997-08-01), None
Masuda Goji, “Gasoline Direct Injection Engine.”, Patent Abstracts of Japan, vol. 2000, No. 2, 11-324778, Nov. 26, 1999, Abstract.

Affiliated with

Also associated with

Rating

Compression self-igniting gasoline engine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Compression self-igniting gasoline engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compression self-igniting gasoline engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2506732