Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means
Reexamination Certificate
2000-03-15
2001-09-04
Kwon, John (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Combustible mixture stratification means
C123S305000
Reexamination Certificate
active
06283089
ABSTRACT:
INCORPORATION BY REFERENCE
The disclosure of Japanese Patent Application No. HEI 11-98761 filed on Apr. 6, 1999 including the specification, drawings and abstract is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a direct-injection internal combustion engine and method for controlling the engine wherein stratified combustion is caused.
2. Description of the Related Art
For the purpose of improving a fuel consumption rate, there has been developed a direct-injection internal combustion engine wherein stratified combustion is caused. In the process of stratified combustion, a rich mixture and lean mixture are formed in a combustion chamber in a layered manner, and the rich mixture is first ignited so that the flames generated thereby burn the lean mixture. Thus, the mixture which is lean as a whole burns with the possibility of incomplete combustion or misfiring being removed. When stratified combustion is caused, fuel injection is carried out in a compression stroke. On the other hand, when homogeneous combustion for burning a stoichiometric mixture is caused, fuel injection is carried out in an intake stroke.
In this manner, the direct-injection internal combustion engine has mutually different operation modes, namely, stratified combustion and homogeneous combustion. Depending on which of these operation modes is selected, a load detecting parameter of an operating condition is detected either from an accelerator operation amount or from an amount relating to intake air, such as a flow rate, a negative pressure, a throttle opening degree or the like. In such circumstances, the control regarding a fuel injection amount and ignition timing and the control regarding an amount of intake air and EGR must be designed to differ from each other in responding performance (e.g. see Japanese Patent Application Laid-Open No. HEI 5-99020).
When one of the operation modes is selected, a fuel injection amount and a control amount for ignition timing are directly calculated using a load detecting parameter (without making any correction). When the other operation mode is selected, the calculation is made with a necessary correction made. Thus, the operation of the engine is optimized in each of the operation modes. However, when making a transition to the operation mode where a correction is made, an appropriate correction amount cannot be used immediately. For this reason, it is difficult to switch operation modes from one to the other smoothly.
SUMMARY OF THE INVENTION
The present invention has been made in view of the aforementioned problem. It is an object of the present invention to provide a direct-injection internal combustion engine wherein a suitable engine control amount including a correction amount can be obtained immediately at the time of a transition to the operation mode where a correction is made in calculating an engine control amount, by calculating a correction value for an engine control amount even when the engine is in the operation mode that does not require correction in calculating the engine control amount.
In order to achieve the above-stated object, according to the present invention, there is provided a direct-injection internal combustion engine wherein a first operation mode and a second operation mode are switched from one to the other according to an operating condition, comprising an accelerator operation amount detector that detects an accelerator operation amount, a parameter detector that detects a parameter relating to intake air, a controller that determines an engine control amount, and a calculator that calculates a correction amount corresponding to responding performance for a change in the engine control amount. The controller determines an engine control amount based on at least the accelerator operation amount when the engine is in the first operation mode and determines the engine control amount using at least the parameter relating to intake air of the engine and the correction amount when the engine is in the second operation mode.
In the aforementioned construction of the present invention, whether or not the operation mode of the engine requires making a correction in calculating an engine control amount, the correction value for the engine control amount can be calculated. Therefore, a suitable engine control amount including a correction amount can be obtained immediately at the time of a transition to the operation mode where a correction is made in calculating an engine control amount.
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patent: 0 849 452 A2 (1997-12-01), None
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Demura Takayuki
Fuwa Naohide
Kako Junichi
Kwon John
Oliff & Berridg,e PLC
Toyota Jidosha & Kabushiki Kaisha
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