Apparatus for controlling the respective cylinders in the fuel supply system of an internal combustion engine
First Claim
1. An apparatus for controlling a plurality of respective cylinders in a fuel supply system of an internal combustion engine, comprising:
- driving state-detecting means for detecting the engine driving state including at least the state quantity participating in the quantity of air sucked in the engine;
basic fuel supply quantity-setting means for setting the basic fuel supply quantity based on the detected driving state;
air-fuel ratio-detecting means for detecting exhaust gas components in a junction of exhaust gas paths of respective cylinders and detecting the air-fuel ratio in an air/fuel mixture sucked in the engine based on the result of the detection of the exhaust gas components;
air-fuel ratio feedback correction value-setting means for setting an air-fuel ratio feedback correction value for correcting the basic fuel supply quantity to bring the detected air-fuel ratio close to the target air-fuel ratio;
fuel supply quantity-setting means for setting the fuel supply quantity based on the basic fuel supply quantity and the air-fuel ratio feedback correction value;
fuel-supplying means disposed separately for respective cylinders and fuel supply-controlling means for driving and controlling the fuel supply means based on the set fuel supply quantity;
an apparatus for detecting errors separately for said respective cylinders, which comprises error-detecting fuel supply quantity setting means for setting an error-detecting fuel supply quantity for detecting errors of supply characteristics of fuel supply means based on said air-fuel ratio feedback correction value, a predetermined value for correcting said air-fuel ratio feedback correction value and a basic fuel supply quantity;
error-detecting fuel supply-controlling means for controlling driving of the fuel supply means of a specific one of said cylinders for a predetermined time based on said error-detecting fuel supply quantity anderror quantity-detecting means for detecting a quantity of error in supply characteristics of the fuel supply means of the respective cylinders separately by comparing the air-fuel ratio feedback correction value set while the fuel supply of the specific one of said cylinders is controlled by said error-detecting fuel supply-controlling means, with the air-fuel ratio feedback correction value set while the fuel supply means of all the cylinders are driven and controlled based on the normal fuel supply quantity corresponding to the driving state.
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Accused Products
Abstract
Only an air-fuel ratio of one specific cylinder is forcibly shifted by the correction of the fuel supply quantity, and the fuel supply characteristic error rate of fuel supply means of this one specific cylinder, where the air-fuel ratio is forcibly shifted is detected based on whether or not the influence of this shifting of the air-fuel ratio is manifested on the air-fuel ratio feedback correction value set, based on the average air-fuel ratio in respective cylinders, as expected. Correction values of the fuel supply quantity are set separately for respective cylinders, based on the fuel supply characteristic error rates thus determined separately for respective cylinders.
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Citations
11 Claims
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1. An apparatus for controlling a plurality of respective cylinders in a fuel supply system of an internal combustion engine, comprising:
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driving state-detecting means for detecting the engine driving state including at least the state quantity participating in the quantity of air sucked in the engine; basic fuel supply quantity-setting means for setting the basic fuel supply quantity based on the detected driving state; air-fuel ratio-detecting means for detecting exhaust gas components in a junction of exhaust gas paths of respective cylinders and detecting the air-fuel ratio in an air/fuel mixture sucked in the engine based on the result of the detection of the exhaust gas components; air-fuel ratio feedback correction value-setting means for setting an air-fuel ratio feedback correction value for correcting the basic fuel supply quantity to bring the detected air-fuel ratio close to the target air-fuel ratio; fuel supply quantity-setting means for setting the fuel supply quantity based on the basic fuel supply quantity and the air-fuel ratio feedback correction value; fuel-supplying means disposed separately for respective cylinders and fuel supply-controlling means for driving and controlling the fuel supply means based on the set fuel supply quantity; an apparatus for detecting errors separately for said respective cylinders, which comprises error-detecting fuel supply quantity setting means for setting an error-detecting fuel supply quantity for detecting errors of supply characteristics of fuel supply means based on said air-fuel ratio feedback correction value, a predetermined value for correcting said air-fuel ratio feedback correction value and a basic fuel supply quantity; error-detecting fuel supply-controlling means for controlling driving of the fuel supply means of a specific one of said cylinders for a predetermined time based on said error-detecting fuel supply quantity and error quantity-detecting means for detecting a quantity of error in supply characteristics of the fuel supply means of the respective cylinders separately by comparing the air-fuel ratio feedback correction value set while the fuel supply of the specific one of said cylinders is controlled by said error-detecting fuel supply-controlling means, with the air-fuel ratio feedback correction value set while the fuel supply means of all the cylinders are driven and controlled based on the normal fuel supply quantity corresponding to the driving state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification