Control apparatus for diesel engine and control method for diesel engine
AssigneeNgk Spark Plug Co., Ltd.
InventorsTakafumi Tanaka, Tetsuhara Honma, Toshiyuki Nakamura, Manabu Okinaka
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Abstract
A control apparatus (100) controls a diesel engine (10). A glow plug (32) which can detect cylinder pressure is provided on the engine (10). An ECU (70) computes a parameter related to a change in cylinder pressure obtained from the glow plug (32). The ECU (70) controls fuel injection timing such that the parameter falls within a target range when combustion in the engine (10) is switched from premixed combustion to diffusion combustion.
Claims20
A diesel engine control apparatus for controlling fuel injection timing of a diesel engine having a combustion cylinder, the control apparatus comprising:
- a cylinder pressure sensor for detecting a cylinder pressure of the diesel engine;
- a parameter computation unit which computes a parameter related to a change in the cylinder pressure of the diesel engine obtained from a signal output from the cylinder pressure sensor;
- and
- a control unit which performs a transition period control for controlling fuel injection timing such that the parameter falls within a target range during a transition time period when combustion in the diesel engine is switched from premixed combustion to diffusion combustion,
- wherein the transition period control includes determining a target value of a fuel injection amount and a target value of an exhaust gas recirculation (EGR) ratio for operation in diffusion combustion based on a required output of the diesel engine, and
- the transition period control decreases the target value of the EGR during the transition time period.
A diesel engine control apparatus for controlling fuel injection timing of a diesel engine, comprising:
- a cylinder pressure sensor for detecting cylinder pressure of the diesel engine;
- and
- a control unit which controls fuel injection timing, based on at least one of a pressure increase rate maximum value and a heat generation rate maximum value which are parameters obtained from a signal output from the cylinder pressure sensor, during a transition time period when combustion in the diesel engine is switched from premixed combustion to diffusion combustion,
- wherein the control unit is further configured to determine a target value of a fuel injection amount and a target value of an exhaust gas recirculation (EGR) ratio for operation in diffusion combustion based on a required output of the diesel engine, and
- the control unit is further configured to decrease the target value of the EGR during the transition time period.
A method for controlling fuel injection timing of a diesel engine, comprising:
- detecting a cylinder pressure of the diesel engine;
- computing, based on the detected cylinder pressure, a parameter which is related to change in the cylinder pressure of the diesel engine;
- and
- controlling the fuel injection timing such that the parameter falls within a target range during a transition time period when combustion in the diesel engine is switched from premixed combustion to diffusion combustion,
- wherein the method further comprises determining a target value of a fuel injection amount and a target value of an exhaust gas recirculation (EGR) ratio for operation in diffusion combustion based on a required output of the diesel engine, and
- the target value of the EGR is decreased during the transition time period.
A method for controlling fuel injection timing of a diesel engine, comprising:
- detecting a cylinder pressure of the diesel engine;
- and
- controlling fuel injection timing, based on at least one of a pressure increase rate maximum value and a heat generation rate maximum value which are parameters obtained from the cylinder pressure, during a transition time period when combustion in the diesel engine is switched from premixed combustion to diffusion combustion,
- wherein the method further comprises determining a target value of a fuel injection amount and a target value of an exhaust gas recirculation (EGR) ratio for operation in diffusion combustion based on a required output of the diesel engine, and
- the target value of the EGR is decreased during the transition time period.
Dependencies are inferred from the claim text.