METHOD AND DEVICE FOR CONTROLLING DIESEL ENGINE WITH FORCED INDUCTION SYSTEM
First Claim
1. A control device for a diesel engine, comprising:
- an engine body having a geometric compression ratio of 15;
1 or lower and for compressing fuel supplied to a cylinder to cause a self-ignition;
a forced induction system for forcibly inducting intake air into the cylinder;
a fuel injection valve arranged so as to be oriented toward the cylinder and for directly injecting the fuel into the cylinder; and
an injection control module for controlling a mode of injecting the fuel into the cylinder through the fuel injection valve;
wherein, when the engine body is within a particular operating range where an engine speed is low and an engine load is partial and in a low temperature state in which a cylinder temperature at an end of a compression stroke is lower than a predetermined temperature, a forcibly inducting level by the forced induction system is set higher than a predetermined level that is higher than that in a high temperature state in which the cylinder temperature is above the predetermined temperature; and
wherein, at least within the particular operating range, the injection control module performs a main injection where a fuel injection starts at or before a top dead center of the compression stroke to cause main combustion mainly including diffusion combustion and performs a pre-stage injection where the fuel injection is performed at least once prior to the main injection to cause pre-stage combustion before the main combustion starts.
1 Assignment
0 Petitions
Accused Products
Abstract
This disclosure provides a control device for a diesel engine. When the engine is within a particular operating range with a low engine speed and a partial engine load and in a low temperature state where a cylinder temperature at a compression stroke end is lower than a predetermined temperature, a forced induction system sets a forcibly inducting level higher than a predetermined level that is higher than that in a high temperature state where the cylinder temperature is above the predetermined temperature. At least within the particular operating range, an injection control module performs a main injection where a fuel injection starts at or before a top dead center of the compression stroke to cause main combustion mainly including diffusion combustion and performs a pre-stage injection where the fuel injection is performed at least once prior to the main injection to cause pre-stage combustion before the main combustion starts.
28 Citations
20 Claims
-
1. A control device for a diesel engine, comprising:
-
an engine body having a geometric compression ratio of 15;
1 or lower and for compressing fuel supplied to a cylinder to cause a self-ignition;a forced induction system for forcibly inducting intake air into the cylinder; a fuel injection valve arranged so as to be oriented toward the cylinder and for directly injecting the fuel into the cylinder; and an injection control module for controlling a mode of injecting the fuel into the cylinder through the fuel injection valve; wherein, when the engine body is within a particular operating range where an engine speed is low and an engine load is partial and in a low temperature state in which a cylinder temperature at an end of a compression stroke is lower than a predetermined temperature, a forcibly inducting level by the forced induction system is set higher than a predetermined level that is higher than that in a high temperature state in which the cylinder temperature is above the predetermined temperature; and wherein, at least within the particular operating range, the injection control module performs a main injection where a fuel injection starts at or before a top dead center of the compression stroke to cause main combustion mainly including diffusion combustion and performs a pre-stage injection where the fuel injection is performed at least once prior to the main injection to cause pre-stage combustion before the main combustion starts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of controlling a diesel engine with a forced induction system in which a geometric compression ratio is set to 15:
- 1 or lower and fuel supplied to a cylinder is compressed to cause a self-ignition, comprising;
controlling, when the diesel engine is within a particular operating range where an engine speed is low and an engine load is partial and in a low temperature state in which a cylinder temperature at an end of a compression stroke is lower than a predetermined temperature, a forcibly inducting level by the forced induction system to be higher than a predetermined level that is higher than that in a high temperature state in which the cylinder temperature is above the predetermined temperature; performing, at least within the particular operating range, a pre-stage injection where a fuel injection is performed at least once at a predetermined timing to cause pre-stage combustion before main combustion mainly including diffusion combustion starts; and starting, after the pre-stage injection, a main injection for causing the main combustion at or before a top dead center of the compression stroke. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- 1 or lower and fuel supplied to a cylinder is compressed to cause a self-ignition, comprising;
Specification