Fuel supply control system for multi-cylinder internal combustion engine with feature of suppression of output fluctuation between individual engine cylinders
First Claim
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1. A fuel supply control system for an internal combustion engine which has a plurality of engine cylinders, comprising:
- first means for delivering a controlled amount of fuel for respective engine cylinders at mutually independent and controlled timing;
second means for monitoring a preselected engine driving condition and producing an engine driving condition indicative signal;
third means for deriving a fuel delivery amount for respective engine cylinders on the basis of the value of said engine driving condition indicative signal;
fourth means for monitoring engine speed variation for detecting fluctuation of combustioning conditions between respective engine cylinders;
fifth means, responsive to the fluctuation of the combustioning condition in excess of a predetermined magnitude, to derive a first correction value for correcting said fuel delivery amount for one of said engine cylinders, based thereon;
sixth means for deriving a second correction value for correcting said fuel delivery amount for other engine cylinders;
seventh means for comparing said correction value with predetermined threshold values for disabling derivation of said correction value when said correction value becomes greater than or smaller than said predetermined threshold values; and
eighth means for controlling said first means at said controlled timing for delivering the fuel in the controlled amount corresponding to the fuel delivery amount corrected by said fifth means.
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Abstract
A fuel supply control system is specifically adapted for an internal combustion engine which performs multi-point injection to supply fuel to respective engine cylinders at mutually independent timing. The combustioning condition in each cylinder is monitored to detect occurrence of fluctuation of combustioning conditions exceeding a predetermined magnitude for initiating fuel delivery amount correction, for compensating fluctuation of engine speed, which is caused by fluctuation of combustioning conditions among the individual engine cylinders.
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Citations
34 Claims
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1. A fuel supply control system for an internal combustion engine which has a plurality of engine cylinders, comprising:
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first means for delivering a controlled amount of fuel for respective engine cylinders at mutually independent and controlled timing; second means for monitoring a preselected engine driving condition and producing an engine driving condition indicative signal; third means for deriving a fuel delivery amount for respective engine cylinders on the basis of the value of said engine driving condition indicative signal; fourth means for monitoring engine speed variation for detecting fluctuation of combustioning conditions between respective engine cylinders; fifth means, responsive to the fluctuation of the combustioning condition in excess of a predetermined magnitude, to derive a first correction value for correcting said fuel delivery amount for one of said engine cylinders, based thereon; sixth means for deriving a second correction value for correcting said fuel delivery amount for other engine cylinders; seventh means for comparing said correction value with predetermined threshold values for disabling derivation of said correction value when said correction value becomes greater than or smaller than said predetermined threshold values; and eighth means for controlling said first means at said controlled timing for delivering the fuel in the controlled amount corresponding to the fuel delivery amount corrected by said fifth means.
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2. A fuel supply control system for an internal combustion engine which has a plurality of engine cylinders, comprising:
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first means for delivering a controlled amount of fuel for respective engine cylinders at mutually independent and controlled timing; second means for monitoring a preselected engine driving condition and for producing an engine driving condition indicative signal; third means for deriving a fuel delivery amount for respective engine cylinders on the basis of the value of said engine driving condition indicative signal; fourth means for monitoring engine speed variation for detecting a fluctuation of combustioning conditions between respective engine cylinders; fifth means, responsive to the fluctuation of the cumbustioning condition in excess of a predetermined magnitude, to derive a correction value for correcting said fuel delivery amount based thereon;
said fifth means comparing said correction value with a predetermined value to detect whether said correction value is within a given value range for modifying the correction value to have a value corresponding to said predetermined value when said correction value is out of said given range; andsixth means for controlling said first means at said controlled timing for delivering the fuel in the controlled amount corresponding to the fuel delivery amount corrected by said fifth means. - View Dependent Claims (3, 4)
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5. A fuel supply control system for an internal combustion engine which has a plurality of engine cylinders, comprising:
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first means for delivering a controlled amount of fuel for respective engine cylinders at mutually independent and controlled timing; second means for monitoring a preselected engine driving condition and producing an engine driving condition indicative signal; third means for delivering a fuel delivery amount for respective engine cylinders on the basis of the value of said engine driving condition indicative signal; fourth means for monitoring engine speed variation for detecting fluctuation of combustioning conditions between respective engine cylinders; fifth means, respective to the fluctuation of combustioning condition in excess of a predetermined magnitude, to derive a correction value for correcting said fuel delivery amount based thereon; sixth means for comparing said correction value with predetermined threshold values for disabling derivation of said correction value when said correction value becomes greater than or smaller than said predetermined threshold values; and seventh means for controlling said first means at said controlled timing for delivering the fuel in the controlled amount corresponding to the fuel delivery amount corrected by said fifth means. - View Dependent Claims (6, 7, 8, 9)
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10. A fuel supply control system for an internal combustion engine which has a plurality of engine cylinders, comprising:
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first means for delivering a controlled amount of fuel for respective engine cylinders at mutually independent and controlled timing; second means for monitoring a preselected engine driving condition and producing an engine driving condition indicative signal; third means for deriving a fuel delivery amount for respective engine cylinders on the basis of the value of said engine driving condition indicative signal; fourth means for monitoring engine speed variation for detecting fluctuation of combustioning conditions between respective engine cylinders; fifth means, responsive to the fluctuation of the combustioning condition in excess of a predetermined magnitude, to derive a correction value for correcting said fuel delivery amount based thereon; and sixth means for controlling said first means at said controlled timing for delivering the fuel in the controlled amount corresponding to the fuel delivery amount corrected by said fifth means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A fuel supply control system for an internal combustion engine which has a plurality of engine cylinders, comprising:
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first means for delivering a controlled amount of fuel for respective engine cylinders at mutually independent and controlled timing; second means for monitoring a preselected engine driving condition and producing an engine driving condition indicative signal; third means for deriving a fuel delivery amount for respective engine cylinders on the basis of the value of said engine driving condition indicative signal; fourth means for monitoring engine speed variation for detecting fluctuation of combustioning conditions between respective engine cylinders; fifth means, responsive to the fluctuation of the combustioning condition in excess of a predetermined magnitude, to derive a first correction value for correcting said fuel delivery amount for one of said engine cylinders, based thereon; sixth means for deriving a second correction value for correcting said fuel delivery amount for other engine cylinders; and seventh means for controlling said first means at said controlled timing for delivering the fuel in the controlled amount corresponding to the fuel delivery amount corrected by said fifth means. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification