Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means
Patent
1998-04-28
2000-07-11
Solis, Erick R.
Internal-combustion engines
Combustion chamber means having fuel injection only
Combustible mixture stratification means
123325, F02B 1700
Patent
active
06085717&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fuel control apparatus for an in-cylinder injection internal combustion engine suitable for use with in-cylinder injection internal combustion engines which can select according to the operating state of the engine a fuel cut mode in which supply of fuel to the combustion chamber is cut.
BACKGROUND ART
In spark ignition type internal combustion engines (hereinafter also referred to as engines), including automobile engines, a technique which attempts to save fuel consumption and also prevent the excessive temperature rise of an exhaust gas purifying catalyzer due to excess hydrocarbon (HC) by cutting fuel injection from the fuel injection valve to cut supply of fuel to the combustion chamber has recently been developed.
Such a technique is also called fuel cut control. This fuel cut control can be performed only under certain conditions, because inevitably it causes a sudden reduction in the engine output (or, specifically an increase in the engine brake). In other words, in the case of low engine speeds, the fuel cut control cannot be carried out because there is the possibility that engine stall will take place. Of course, similarly, where a driver does not desire deceleration, the fuel cut control cannot be carried out.
Hence, in the case where the throttle valve is fully closed when the engine speed is greater than a predetermined speed, generally the fuel cut control is attempted to be performed.
In this case, for conditions for the opening degree of the throttle valve, in addition to a technique for directly detecting and judging a throttle opening degree, there is a technique for judging based on whether or not an engine is in an idle state.
In other words, the case where an engine goes to an idle state is one where the throttle valve is less than a predetermined micro opening degree, and generally, idle control is performed based on information from an idle switch which operates according to the throttle opening degree. If the throttle valve is less than a predetermined micro opening degree, it means this case nearly coincides with the case where the throttle valve is fully closed. Hence, the technique that causes fuel cut control to be carried out in the case where an engine goes to an idle state when the engine speed is greater than a predetermined speed has been developed.
However, where fuel cut control is carried out based on whether or not an engine is in an idle state, the fuel cut control is prohibited for a predetermined period after the engine has made a transition from a non-idle state to an idle state, for the purpose of confirming that the throttle valve has been fully closed.
Also, if fuel cut is performed, a sudden reduction in the output torque of an engine will be caused. In automobile engines, since a vehicle will be considerably shocked, another technique has been developed. Even if the accelerator pedal is off, the throttle valve will not be fully closed suddenly but will be gently closed by operation of a so-called dashpot, thereby avoiding a sudden reduction in the engine output torque and a great shock to a vehicle.
The aforementioned fuel cut control, incidentally, has been applied to a multipoint injection (MPI) engine equipped with fuel injection valves each in an intake port of each cylinder, but, since an in-cylinder injection engine (in-cylinder injection internal combustion engine) with a fuel injection valve faced so as to inject fuel directly into the combustion chamber within the cylinder has been developed in recent years, the fuel cut control is desired to be applied to such an in-cylinder injection engine.
Such an in-cylinder injection engine can inject fuel into the combustion chamber at any time regardless of the opening and closing of the intake valve and therefore can carry out various characteristic operations as follows:
For example, a fuel injection mode with a compression stroke as primary (this is referred to as a compression stroke injection mode) can be set. In this compression stroke injection mod
REFERENCES:
patent: 4066046 (1978-01-01), McAlister
patent: 4788942 (1988-12-01), Pouring et al.
patent: 5826559 (1998-10-01), Ichimoto et al.
patent: 5875756 (1999-03-01), Kamura et al.
Hatayama Kenjiro
Kamura Hitoshi
Kojima Atsuyoshi
Nomura Toshiro
Tamura Hiroki
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Solis Erick R.
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