Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means
Patent
1998-04-28
1999-11-02
Solis, Erick R.
Internal-combustion engines
Combustion chamber means having fuel injection only
Combustible mixture stratification means
F02B 1700
Patent
active
059750448
DESCRIPTION:
BRIEF SUMMARY
This application claims the benefit under 35 U.S.C. .sctn. 371 of prior PCT International Application No. PCT/JP97/01441, which has an International filing date of Apr. 24, 1997, which designated the United States of America, the entire contents of which are hereby incorporated by references.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a control unit for in-cylinder injection internal combustion engine which can select, according to an engine operation state, a compression stroke injection mode for mainly injecting fuel at a compression stroke and an intake stroke injection mode for mainly injecting fuel at an intake stroke; and, in particular, to a control unit for in-cylinder injection internal combustion engine which can optimally correct an intake amount.
2. Background Art
A throttle valve is installed in an intake passage of an engine such as an internal combustion engine. There has been developed a configuration of an intake system in which a bypass passage bypassing the throttle-valve-installed portion is formed such that its both end portions communicate with the intake passage, and the bypass passage is equipped with a bypass valve.
Commonly employed as such a bypass valve is, for example, a bypass valve for idle speed control which is used for adjusting the intake amount so that the engine can maintain a predetermined idling rotational speed.
Independently of a throttle valve whose opening degree is adjusted in response to a driver's operation for stepping on an accelerator pedal, the opening degree of the idle speed control bypass valve is appropriately adjusted, while feeding back the engine rotational speed, in order to keep the engine rotational speed at a predetermined idle rotational speed, and independently of the driver's accelerator pedal operation, the intake amount is adjusted so as to maintain the idle rotational speed.
Also, there has been developed a configuration of an intake system in which, separately from the bypass passage for idle speed control and the bypass valve, a bypass passage for bypassing the throttle-valve-installed portion of the intake passage is formed so as to be used for controlling the air/fuel ratio of the air/fuel mixture supplied to a combustion chamber not only upon idling, and this bypass passage is equipped with a bypass valve [which is referred to as air bypass valve (ABV)].
Such an air bypass valve can control not only idle speed but also other engine operation states by adjusting the intake amount independently of the throttle valve that is adjusted upon the driver's accelerator pedal operation.
In any case, the opening degree of these bypass valve is appropriately controlled according to the engine operation state or the like, independently of the throttle valve that is adjusted by the driver's accelerator pedal operation.
Also, when the idle speed is to be controlled by such a bypass valve, a target engine rotational speed is set according to cooling water temperature, air conditioner state, shift lever position (in the case of automatic transmission), or the like, and while an actual engine rotational speed is being detected, the opening degree of the bypass valve is adjusted so that the actual engine rotational speed coincides with the target engine rotational speed.
When the bypass valve is used for the purpose other than idle speed control, by contrast, an air amount (intake correction amount) to be taken in by the bypass valve is set according to the engine operation state, and the opening of the bypass valve is adjusted to such a degree that this air amount is attained. In this case, a relationship between the engine operation state and its corresponding intake correction amount or valve opening degree may be mapped, for example, and the intake correction amount or valve opening degree is set while the engine operation state is caused to correspond to this relationship (map).
Further, there is a technique in which a motor-driven throttle valve is provided such that the throttle valve is driven by a motor, w
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Hatayama Kenjiro
Kamura Hitoshi
Kojima Atsuyoshi
Tamura Hiroki
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Solis Erick R.
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