CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

• US 20130085658A1
• Filed: 06/08/2010
• Published: 04/04/2013
• Est. Priority Date: 06/08/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Miyake, Teruhiko
• Granted Patent: US 9,037,387 B2
• Time in Patent Office: Days
• US Class Current: 701/112
• CPC Class Codes: F02D 2200/0408 Estimation of intake manifold pressure
• CPC Class Codes: F02D 2200/0802 Temperature of the exhaust gas treatment apparatus
• CPC Class Codes: F02D 2200/0804 Estimation of the temperature of the exhaust gas treatment apparatus
• CPC Class Codes: F02D 41/2441 characterised by the learning conditions
• CPC Class Codes: F02D 41/2448 Prohibition of learning
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: F02D 45/00 Electrical control not provided for in groups F02D41/00 - F02D43/00

Abstract

A control apparatus for an internal combustion engine having a means for performing a model calculation to calculate, as an exhaust temperature calculation value, the temperature of exhaust gas in an exhaust branch tube at the time of starting an engine, using a model representing the temperature behavior of the exhaust gas in the exhaust branch tube during stop of an engine; and an exhaust temperature actual measurement value output means for detecting the temperature of exhaust gas in the exhaust branch tube, and outputting the detected temperature as an exhaust temperature actual measurement value, wherein the model includes at least one parameter.

Claims

1. A control device for an internal combustion engine, the control device comprising a configuration to:

executing execute a model-calculation on a temperature of exhaust gas to calculate an calculated value of the temperature of exhaust gas in an exhaust manifold upon an operation of the engine being started by using a model representing a behavior of the temperature of exhaust gas in the exhaust manifold of the engine during the operation of the engine being stopped; and

outputting output a measured value of the temperature of exhaust gas by detecting the temperature of exhaust gas in the exhaust manifold of the engine

the model including at least one parameter,

the control device further comprising a configuration to execute a learning-to-correction on the parameter included in the model based on the behavior of the temperature of exhaust gas in the exhaust manifold of the engine during the operation of the engine being stopped, the behavior being presumed by the followings;

the measured value of the temperature of exhaust gas output at a first time point where the engine being stopped; and

the measured value of the temperature of exhaust gas output at a second time point where the engine being started after the first time point a the learning-to-correction on the parameter being to learn and correct the parameter so as to match the calculated value of the temperature of exhaust gas at the second time point calculated through the model-calculation on the temperature of exhaust gas to an actual temperature of exhaust gas in the exhaust manifold at the second time point.

2. The control device according to claim 1,

wherein the control device being applied to an internal combustion engine configured to stop the operation of the engine at a frequency enabling an accuracy of the parameter included in the model to be maintained in an acceptable accuracy.

3. The control device according to claim 1,

wherein the execution of the learning-to-correction on the parameter being prohibited upon the engine having been continuously in a high-load operation state until immediately before the operation of the engine being stopped and a high-load duration time where the high-load operation state having been continued being equal to or more than a threshold value to prohibit the learning concerning the high-load duration time, the high-load duration time being a time period where the engine being continuously in the high-load operation state, the threshold value being determined in advance so as to be a threshold value to determine whether or not the learning-to-correction on the parameter being to be executed.

4. The control device according to claim 1, wherein the execution of the learning-to-correction on the parameter being prohibited upon an engine-being-stopped duration time being equal to or less than a threshold value to prohibit the learning concerning an excessively short period for the engine-being-stopped duration time, the engine-being-stopped duration time being a time period where the operation of the engine being stopped, the threshold value being determined in advance so as to be a threshold value to determine whether or not the learning-to-correction on the parameter being to be executed.

5. The control device according to claim 1,

wherein the execution of the learning-to-correction on the parameter being prohibited upon an engine-being-stopped duration time being equal to or more than a threshold value to prohibit the learning concerning an excessively long period for the engine-being-stopped duration time, the engine-being-stopped duration time being a time period where the operation of the engine being stopped, the threshold value being determined in advance so as to be a threshold value to determine whether or not the learning-to-correction on the parameter being to be executed.

6. The control device according to a claim 1,

wherein an exhaust pipe being connected to the exhaust manifold,

an exhaust turbine of a supercharger being located in the exhaust pipe,

the control device executing a model-calculation on a supercharging pressure to calculate an calculated value of the supercharging pressure by the supercharger by using a model representing a behavior of the supercharging pressure of the supercharger during the supercharger being operated,

the calculated value of the temperature of exhaust gas calculated through the model-calculation on the temperature of exhaust gas being used in the model-calculation on the supercharging pressure.

7. The control device according to of claim 1,

wherein the parameter included in the model being learned and corrected so as to match the calculated value of the temperature of exhaust gas to the actual temperature of exhaust gas in the exhaust manifold at the second time point through the learning-to-correction on the parameter based on the followings:

the measured value of the temperature of exhaust gas at the first time point;

the measured value of the temperature of exhaust gas at the second time point; and

the calculated value of the temperature of exhaust gas calculated through the model-calculation on the temperature of exhaust gas as the temperature of exhaust gas in the exhaust manifold at the second time point.