Control device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016334304-A1
Application number	US-201415102313-A
Country	US
Kind code	A1
Filing date	Dec 10, 2014
Priority date	Dec 17, 2013
Publication date	Nov 17, 2016
Grant date	—

Abstract

A control device for an internal combustion engine that includes: a first detection unit detecting, as a first parameter, a temperature of a nozzle tip of an injector; and a second detection unit detecting, as a second parameter, a heat quantity of a cylinder head, and executes a dew condensation determination by using at least one of the first parameter and the second parameter, the control device includes: a third detection unit detecting an evaluation value allowing to evaluate a state of the internal combustion engine, a threshold value for selecting which parameter of the first and second parameters is selected being set with respect to the evaluation value, wherein the control device switches a parameter to be used to the first parameter, to the second parameter, or to both the first and second parameters in accordance with the evaluation value when executing the dew condensation determination.

First claim

1 . A control device for an internal combustion engine that includes: a first detection unit that detects, as a first parameter, a temperature of a nozzle tip of an injector; and a second detection unit that detects, as a second parameter, a heat quantity of a cylinder head, and executes a dew condensation determination that determines whether dew condensation is to occur on the nozzle tip of the injector after shutdown of the internal combustion engine by using at least one of the first parameter and the second parameter, the control device comprising:
a third detection unit that detects an evaluation value that allows to evaluate a state of the internal combustion engine, a threshold value for selecting which parameter of the first parameter and the second parameter is selected being set with respect to the evaluation value, wherein the control device switches a parameter to be used to the first parameter, to the second parameter, or to both the first parameter and the second parameter in accordance with the evaluation value when executing the dew condensation determination.

2 . The control device for an internal combustion engine according to claim 1 , wherein
the second parameter is used as the parameter to be used for the dew condensation determination when the evaluation value is equal to or less than a first threshold value.

3 . The control device for an internal combustion engine according to claim 1 ,
wherein both the first parameter and the second parameter are used as the parameter to be used for the dew condensation determination when the evaluation value is between a first threshold value and a second threshold value greater than the first threshold value.

4 . The control device for an internal combustion engine according to claim 1 ,
wherein the first parameter is used as the parameter to be used for the dew condensation determination when the evaluation value is equal to or greater than a second threshold value greater than a first threshold value.

5 . The control device for an internal combustion engine according to claim 1 ,
wherein the evaluation value is the temperature of the nozzle tip of the injector.

6 . The control device for an internal combustion engine according to claim 1 ,
wherein the evaluation value is a temperature of cooling water of the internal combustion engine.

7 . The control device for an internal combustion engine according to claim 1 ,
wherein the second detection unit detects the heat quantity of the cylinder head as the second parameter by reflecting a heat quantity accumulated after starting of the internal combustion engine to a heat quantity of the cylinder head in the starting of the internal combustion engine.

Assignees

• Toyota Motor Co Ltd

Inventors

• IKEMOTO Masato

Classifications

• G01M15/048 Primary

  by monitoring temperature · CPC title

• F02M61/18

  Injection nozzles, e.g. having valve seats; {Details of valve member seated ends, not otherwise provided for} · CPC title

• F01P2025/08

  Temperature · CPC title

• F01P3/20

  Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) · CPC title

• F01P11/16 Primary

  concerning coolant temperature (F01P11/20 takes precedence) · CPC title