System for operating an internal combustion engine in a motor ve

Details System for operating an internal combustion engine in a motor ve System for operating an internal combustion engine in a motor ve

1999-04-29

2000-09-12

Yuen, Henry C.

Internal-combustion engines

Combustion chamber means having fuel injection only

Having a particular relationship between injection and...

123480, 123435, 123295, F02B 1700, F02D 4134

Patent

active

061162108

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a method of operating an internal combustion engine in a motor vehicle in particular, where fuel is injected directly into a combustion chamber either during an intake phase in a first operating mode or during a compression phase in a second operating mode, and where the fuel mass to be injected into the combustion chamber is controlled and/or regulated differently in the two operating modes. In addition, the present invention concerns an internal combustion engine for a motor vehicle in particular, having an injection valve with which fuel can be injected directly into a combustion chamber either during an intake phase in a first operating mode or during a compression phase in a second operating mode and having a control unit for different control and/or regulation of the fuel mass to be injected into the combustion chamber in the two operating modes.


BACKGROUND INFORMATION

Systems for direct injection of fuel into the combustion chamber of an internal combustion engine are known in general. A distinction is made between homogeneous operation as the first operating mode and stratified charge operation as the second operating mode. Stratified charge operation is used in particular at low loads applied to the internal combustion engine, while homogeneous operation is used at higher loads. In stratified charge operation, fuel is injected into the combustion chamber during the compression phase of the combustion engine, specifically, it is injected into the immediate vicinity of a spark plug. Consequently, there no longer is a uniform distribution of fuel in the combustion chamber, but instead the fuel is immediately ignited by the spark plug. The advantage of stratified charge operation is that smaller loads can be handled by the engine with a much smaller fuel mass. However, higher loads cannot be handled by stratified charge operation. In the homogeneous operating mode provided for such higher loads, fuel is injected during the intake phase of the combustion engine, so that turbulence can be created in the fuel to ensure a good distribution of fuel in the combustion chamber. To this extent, homogeneous operation corresponds approximately to the operating mode of internal combustion engines wherein fuel is injected into an intake manifold leading to the combustion chamber in the traditional manner.
In both operating modes, i.e. in stratified charge operation and in homogeneous operation, the amount of fuel injected is controlled and/or regulated as a function of multiple input parameters to optimize fuel savings, reduce exhaust, etc. The control and/or regulation is different in the two operating modes.


SUMMARY OF THE INVENTION

An object of the present invention is to create an improved method of control and/or regulation in the two operating modes of an internal combustion engine.
This object is achieved according to the present invention with a method and an internal combustion engine which determines a required air mass from a required torque in the first operating mode and determines the fuel mass to be injected from the required air mass, and determines, from the required torque, the fuel mass to be injected directly in the second operating mode.
The control and/or regulation of the fuel mass to be injected is thus air-based in homogeneous operation. First, the required air mass is determined and then the fuel mass to be injected is determined from this. To this extent, control and/or regulation in homogeneous operation corresponds approximately to control and/or regulation in known internal combustion engines where fuel is injected into an intake manifold leading to the combustion chamber in a conventional manner. This yields the important advantage that the control and/or regulation used with conventional combustion engines can also be used at least in part for homogeneous operation with the method and the internal combustion engine of the present invention. The existing programs for a control unit carrying out the control and/or regulati

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patent: 5483934 (1996-01-01), Heinz
patent: 5704339 (1998-01-01), Choe et al.
patent: 5746176 (1998-05-01), Damson et al.
patent: 5746183 (1998-05-01), Parke et al.
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