Controller for internal combustion engine
First Claim
1. A controller for an internal combustion engine, comprising:
- lean correcting means for setting a lean correction value for correcting a fuel injection amount by decreasing the fuel injection amount during an operation after a cold start of an internal combustion engine and controlling an air-fuel ratio of the internal combustion engine to be leaner than a stoichiometric air-fuel ratio;
engine speed fluctuation detecting means for detecting fluctuations in revolution speed of the internal combustion engine;
correction amount calculating means for calculating a correction value for correcting the air-fuel ratio to the rich side on the basis of the engine speed fluctuation detected by the engine speed fluctuation detecting means;
final correction value calculating means for calculating a final correction value of this time by selecting either a final correction value of last time or a correction value calculated by the correction amount calculating means as a correction value which suppresses the engine speed fluctuation more; and
fuel injection amount correcting means for correcting the fuel injection amount on the basis of the lean correction value and the final correction value.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention is directed to provide a controller for an internal combustion engine, capable of suppressing deterioration in drivability of an engine. A controller for an internal combustion engine has lean control means for calculating a torque margin from a reference engine speed and an actual engine speed and setting a combustion air-fuel ratio of an internal combustion engine to the lean side on the basis of the torque margin. In addition to correction of a fuel injection amount by the lean control means, the fuel injection amount is further corrected on the basis of a final correction value for reducing deterioration in drivability. The final correction value is set by selecting either a correction value which is set on the basis of an engine speed fluctuation amount or a final correction value of last time, which suppresses deterioration in drivability more. Thus, the operation of setting the air-fuel ratio to the lean side while considering deterioration in drivability can be performed.
-
Citations
12 Claims
-
1. A controller for an internal combustion engine, comprising:
-
lean correcting means for setting a lean correction value for correcting a fuel injection amount by decreasing the fuel injection amount during an operation after a cold start of an internal combustion engine and controlling an air-fuel ratio of the internal combustion engine to be leaner than a stoichiometric air-fuel ratio;
engine speed fluctuation detecting means for detecting fluctuations in revolution speed of the internal combustion engine;
correction amount calculating means for calculating a correction value for correcting the air-fuel ratio to the rich side on the basis of the engine speed fluctuation detected by the engine speed fluctuation detecting means;
final correction value calculating means for calculating a final correction value of this time by selecting either a final correction value of last time or a correction value calculated by the correction amount calculating means as a correction value which suppresses the engine speed fluctuation more; and
fuel injection amount correcting means for correcting the fuel injection amount on the basis of the lean correction value and the final correction value. - View Dependent Claims (2, 3)
-
-
4. A controller for an internal combustion engine, comprising:
-
engine speed fluctuation detecting means for detecting fluctuations in revolution speed of an internal combustion engine;
final correcting means for correcting a predetermined parameter used for controlling the internal combustion engine on the basis of a final correction value; and
control means for controlling the internal combustion engine on the basis of the predetermined parameter corrected by the final correcting means, wherein correction value setting means for setting a correction value for correcting the predetermined parameter on the basis of an engine speed fluctuation detected by the engine speed fluctuation detecting means is provided, and the final correcting means selects either a correction value set by the correction value setting means or a final correction value of last time set by the final correcting means, which suppresses the engine speed fluctuation more, and sets a final correction value. - View Dependent Claims (5, 6)
-
-
7. A controller for an internal combustion engine, comprising:
-
control means using a parameter which exerts an influence on a revolution speed fluctuation amount of an internal combustion engine;
basic fuel injection amount setting means for setting a basic fuel injection amount for carrying out combustion at a relatively lean air-fuel ratio;
engine speed fluctuation amount detecting means for detecting a revolution speed fluctuation amount of the internal combustion engine; and
roughness correcting means for correcting the basic fuel injection amount which is set by the basic fuel injection amount setting means on the basis of the revolution speed fluctuation amount of the internal combustion engine detected by the engine speed fluctuation amount detecting means, wherein correcting means for correcting a correction amount in the roughness correcting means on the basis of the value of the parameter is provided. - View Dependent Claims (8)
-
-
9. A controller for an internal combustion engine having control means for computing a feedback correction factor for feedback-controlling a fuel injection amount on the basis of an air-fuel ratio sensor output value and a target air-fuel ratio and controlling a fuel injection amount, comprising:
-
engine speed fluctuation detecting means for detecting fluctuations in revolution speed of an internal combustion engine; and
guard value setting means for setting a guard value for regulating the feedback correction factor on the basis of fluctuations in revolution speed of the internal combustion engine detected by the engine speed fluctuation detecting means. - View Dependent Claims (10, 11, 12)
-
Specification