US 6,474,294 B2 · Direct injection type internal combustion engine control apparatus and control method of the same

Abstract

A direct injection type internal combustion engine control apparatus is capable of increasing the frequency of performing the compression-stroke fuel injection following an automatic start of the engine by maintaining a sufficient fuel pressure for the compression-stroke injection even after the engine has been stopped by an automatic stop function. When an immediately-before-automatic-stop flag is “ON”, the control apparatus sets the control duty of an electromagnetic spill valve to 100 (%) to raise the fuel pressure immediately before the automatic stop. As a result, after the engine stops, the fuel pressure starts to decrease from a high pressure, so that there will be a long time before the fuel pressure decreases to a level that makes it impossible to perform appropriate fuel injection into the combustion chamber during the compression stroke. Therefore, the possibility of performance of the compression-stroke injection immediately following an automatic start is increased, and the frequency of performing the compression-stroke injection is increased. Thus, sufficient improvements in fuel economy and the like can be achieved.

Claims20

Dependent claims

A control apparatus of a direct injection type internal combustion engine in which an air-fuel mixture formed by injecting a fuel delivered from a fuel pump, directly from a fuel injection valve into a combustion chamber, is ignited by an ignition plug, the control apparatus comprising:

an automatic stop permitting unit that permits an automatic stop of the internal combustion engine if during an operation of the internal combustion engine, an operating state of the internal combustion engine meets an automatic stop condition;
an automatic start permitting unit that permits an automatic start of the internal combustion engine if the operating state of the internal combustion engine meets an automatic start condition;
and
a fuel pressure raising unit that raises a fuel pressure on a fuel injection valve side during a first period of time_prior to the automatic stop permitted by the automatic stop permitting unit.

1 more element

A control method of a direct injection type internal combustion engine in which an air-fuel mixture formed by injecting a fuel delivered from a fuel pump, directly from a fuel injection valve into a combustion chamber, is ignited by an ignition plug, the control method comprising the steps of:

permitting an automatic stop of the internal combustion engine if during an operation of the-internal combustion engine, an operating state of the internal combustion engine meets an automatic stop condition;
permitting an automatic start of the internal combustion engine if the operating state of the internal combustion engine meets an automatic start condition;
and
raising a fuel pressure on a fuel injection valve side during a first period of time prior to the permitted automatic stop.

1 more element

Dependencies are inferred from the claim text.

Direct injection type internal combustion engine control apparatus and control method of the same

Life of this patent

Direct injection type internal combustion engine control apparatus and control method of the same

Life of this patent

Abstract

Claims20