Apparatus for learning control of air-fuel ratio of airfuel mixture in electronically controlled fuel injection type internal combustion engine

Claim 1

An apparatus for learning control of an air-fuel ratio of an air-fuel mixture in an electronically controlled fuel injection type internal combustion engine, which comprises means for detecting a driving state of the engine, which includes at least first detecting means for detecting a flow quantity Q of air sucked in the engine, second detecting means for detecting a rotation speed N of the engine and third detecting means for detecting a concentration of the exhaust component so as to detect the actual air-fuel ratio λ of the air-fuel mixture sucked in the engine based on the detected concentration of the exhaust component, fuel injection means for injecting and supplying a fuel to the engine in an on-off manner in response to a driving pulse signal, basic fuel injection quantity operating means for operating a basic fuel injection quantity Tp of the fuel to be supplied to the engine based on the flow quantity Q of air sucked in the engine, which is put out by said first detecting means, and the engine rotation speed N put out by said second detecting means, random access memory means in which the learning correction coefficient αo for correcting said basic fuel injection quantity Tp is pre-stored in advance according to the driving state of the engine, learning correction coefficient retrieval means for retrieving the learning correction coefficient αo from said memory means according to the actually detected driving state of the engine, feedback correction coefficient setting means for increasing or decreasing by at least a predetermind integration component unit a feedback correction coefficient α so that the actual air-fuel ratio λ put out by said third detecting means is brought close to the present aimed air-fuel ratio λt, learning correction coefficient renewal means for setting a new learning correction coefficient, which is operating based on the feedback correction coefficient α set by said feedback correction coefficient setting means and the learning correction coefficient αo retrieved by said learning correction coefficient retrieval means according to the detected driving state of the engine, as the corresponding learning correction coefficient αo of said memory means, fuel injection quantity operating means for operating a fuel injection quantity Ti by correcting the basic fuel injection quantity Tp based on the retrieved or retrieved and renewed learning correction coefficient αo and also based on the feedback correction coefficient α set by said feedback correction coefficient setting means, and driving pulse signal output means for putting out the driving pulse signal corresponding to the fuel injection quantity Ti to said fuel injection means, wherein said means for detecting the driving state of the engine comprises fourth detecting means for detecting a stationary state of the engine and said learning correction coefficient renewal means is actuated when the engine is in the stationary state, said fourth detecting means including car speed detecting means, engine speed detecting means and means for detecting an opening degree of a throttle valve arranged in an intake passage of the engine, and when it is detected that the state in which the car speed and the engine speed are constant and the opening degree of the throttle valve is constant for a predetermined time, it is determined that the engine is in the stationary state.

Claim 2

An apparatus for learning control of an air-fuel ratio of an air-fuel mixture in an electronically controlled fuel injection type internal combustion engine, which comprises means for detecting a driving state of the engine, which includes at least first detecting means for detecting a flow quantity Q of air sucked in the engine, second detecting means for detecting a rotation speed N of the engine and third detecting means for detecting a concentration of the exhaust component so as to detect the actual air-fuel ratio λ of the air-fuel mixture sucked in the engine based on the detected concentration of the exhaust component, fuel injection means for injecting and supplying a fuel to the engine in an on-off manner in response to a driving pulse signal, basic fuel injection quantity operating means for operating a basic fuel injection quantity Tp of the fuel to be supplied to the engine based on the flow quantity Q of air sucked in the engine, which is put out by said first detecting means, and the engine rotation speed N put out by said second detecting means, random access memory means in which the learning correction coefficient αo for correcting said basic fuel injection quantity Tp is pre-stored in advance according to the driving state of the engine, learning correction coefficient retrieval means for retrieving the learning correction coefficient αo from said memory means according to the actually detected driving state of the engine, feedback correction coefficient setting means for increasing or decreasing by at least a predetermind integration component unit a feedback correction coefficient α so that the actual air-fuel ratio λ put out by said third detecting means is brought close to the present aimed air-fuel ratio λt, learning correction coefficient renewal means for setting a new learning correction coefficient, which is operating based on the feedback correction coefficient α set by said feedback correction coefficient setting means and the learning correction coefficient αo retrieved by said learning correction coefficient retrieval means according to the detected driving state of the engine, as the corresponding learning correction coefficient αo of said memory means, fuel injection quantity operating means for operating a fuel injection quantity Ti by correcting the basic fuel injection quantity Tp based on the retrieved or retrieved and renewed learning correction coefficient αo and also based on the feedback correction coefficient α set by said feedback correction coefficient setting means, and driving pulse signal output means for putting out the driving pulse signal corresponding to the fuel injection quantity Ti to said fuel injection means, wherein said means for detecting the driving state of the engine comprises fourth detecting means for detecting a stationary state of the engine and said learning correction coefficient renewal means is actuated when the engine is in the stationary state, said fourth detecting means including car speed detecting means, engine speed detecting means and means for detecting an opening degree of a throttle valve arranged in an intake passage of the engine, and when it is detected that the state in which the car speed and the engine speed are constant and the opening degree of the throttle valve is constant for a predetermined time, it is determined that the engine is in the stationary state.

Claim 3

An apparatus for learning control of an air-fuel ratio mixture in an electronically controlled fuel injection type internal combustion engine, which comprises means for detecting a driving state of the engine, which includes at least first detecting means for detecting a flow quantity Q of air sucked in the engine, second detecting means for detecting a rotation speed N of the engine and third detecting means for detecting a concentration of the exhaust component so as to detect the actual air-fuel ratio λ of the air-fuel mixture sucked in the engine based on the detected concentration of the exhaust component, fuel injection means for injecting and supplying a fuel to the engine in an on-off manner in response to a driving pulse signal, basic fuel injection quantity operating means for operating a basic fuel injection quantity Tp of the fuel to be supplied to the engine based on the flow quantity Q of air sucked in the engine, which is put out by said first detecting means, and the engine rotation speed N put out by said second detecting means, random access memory means in which the learning correction coefficient λo for correcting said basic fuel injection quantity Tp is pre-stored in advance according to the driving state of the engine, learning correction coefficient retrieval means for retrieving the learning correction coefficient αo from said memory means according to the actually detected driving state of the engine, feedback correction coefficient setting means for increasing or decreasing by at least a predetermined integration component unit a feedback correction coefficient α so that the actual air-fuel ratio λ put out by said third detecting means is brought close to the present aimed air-fuel ratio λt, learning correction coefficient renewal means fo setting a new learning correction coefficient, which is operating based on the feedback correction coefficient α set by said feedback correction coefficient setting means and the learning correction coefficient αo retrieved by said learning correction coefficient retrieval means according to the detected driving state of the engine, as the corresponding learning correction coefficient αo of said memory means, fuel injection quantity operating means for operating a fuel injection quantity Ti by correcting the basic fuel injection quantity Tp based on the retrieved or retrieved and renewed learning correction coefficient αo and also based on the feedback correction coefficient α set by said feedback correction coefficient setting means, and driving pulse signal output means for putting out the driving pulse signal corresponding to the fuel injection quantity Ti to said fuel injection means, wherein said learning correction coefficient renewal means comprises means for setting a new learning correction coefficient according to the equation of αo←αo+Δα/M in which Δα is a deviation of the feedback correction coefficient α from the set standard value and M is a constant.

Claim 4

An apparatus for learning control of an air-fuel ratio mixture in an electronically controlled fuel injection type internal combustion engine, which comprises means for detecting a driving state of the engine, which includes at least first detecting means for detecting a flow quantity Q of air sucked in the engine, second detecting means for detecting a rotation speed N of the engine and third detecting means for detecting a concentration of the exhaust component so as to detect the actual air-fuel ratio λ of the air-fuel mixture sucked in the engine based on the detected concentration of the exhaust component, fuel injection means for injecting and supplying a fuel to the engine in an on-off manner in response to a driving pulse signal, basic fuel injection quantity operating means for operating a basic fuel injection quantity Tp of the fuel to be supplied to the engine based on the flow quantity Q of air sucked in the engine, which is put out by said first detecting means, and the engine rotation speed N put out by said second detecting means, random access memory means in which the learning correction coefficient λo for correcting said basic fuel injection quantity Tp is pre-stored in advance according to the driving state of the engine, learning correction coefficient retrieval means for retrieving the learning correction coefficient αo from said memory means according to the actually detected driving state of the engine, feedback correction coefficient setting means for increasing or decreasing by at least a predetermined integration component unit a feedback correction coefficient α so that the actual air-fuel ratio λ put out by said third detecting means is brought close to the present aimed air-fuel ratio λt, learning correction coefficient renewal means fo setting a new learning correction coefficient, which is operating based on the feedback correction coefficient α set by said feedback correction coefficient setting means and the learning correction coefficient αo retrieved by said learning correction coefficient retrieval means according to the detected driving state of the engine, as the corresponding learning correction coefficient αo of said memory means, fuel injection quantity operating means for operating a fuel injection quantity Ti by correcting the basic fuel injection quantity Tp based on the retrieved or retrieved and renewed learning correction coefficient αo and also based on the feedback correction coefficient α set by said feedback correction coefficient setting means, and driving pulse signal output means for putting out the driving pulse signal corresponding to the fuel injection quantity Ti to said fuel injection means, wherein said learning correction coefficient renewal means comprises means for setting a new learning correction coefficient according to the equation of αo←αo+Δα/M in which Δα is a deviation of the feedback correction coefficient α from the set standard value and M is a constant.

Claim 5

An apparatus for learning control of an air-fuel ratio of an air-fuel mixture in an electronically controlled fuel injection type internal combustion engine, which comprises means for detecting a driving state of the engine, which includes at least first detecting means for detecting a flow quantity Q of air sucked in the engine, second detecting means for detecting a rotation speed N of the engine, third detecting means for detecting a concentration of the exhaust component so as to detect the actual air-fuel ratio λ of the air-fuel mixture sucked in the engine and fourth detecting means for detecting acceleration or deceleration of the engine, fuel injection means for injecting and supplying a fuel to the engine in an on-off maner in response to a driving pulse signal, basic fuel injection quantity determining means for operating a basic injection quantity Tp of the fuel to be supplied to the engine based on the flow quantity Q of air sucked in the engine, which is put out by said first detecting means, and the engine rotation speed N put out by said second detecting means, random access first memory means in which the learning correction coefficient αo for correcting said basic fuel injection quality Tp is prestored in advance according to the driving state of the engine, learning correction coefficient retrieval means for retrieving the learning correction coefficient αo from said first memory means according to the actually detected driving state of the engine, feedback correction coefficient setting means for increasing or decreasing by at least a predetermined integration component unit a feedback correction coefficient α so that the actual air-fuel ratio λ put out by said third detecting means is brought close to the present target air-fuel mixture λt, learning correction coefficient renewal means for setting a new learning correction coefficient, which is operated based on the feedback correction coefficient α set by said feedback correction coefficient setting means and the learning correction coefficient αo retrieved by said learning correction coefficient retrieval means according to the detected driving state of the engine, as the corresponding learning correction coefficient αo of said first memory means, clamping means for clamping the feedback correction coefficient α of the feedback correction coefficient setting means when acceleration or deceleration of the engine is detected by said fourth detecting means and stopping the feedback control, random access second memory means in which acceleration and deceleration correction coefficients Kacc and Kdcl for increasing or decreasing and correcting the fuel injection quantity at the time of acceleration or deceleration according to the driving state of the engine are pre-stored in advance, acceleration and deceleration correction coefficient retrieval means for retrieving the acceleration or deceleration correction coefficient Kacc or Kdcl from said second memory means according to the driving state of the engine when acceleration or deceleration of the engine is detected by said fourth detecting means, fuel injection quantity operating means for operating a fuel injection quantity Ti by correcting the basic fuel injection quantity Tp based on the retrieved or retrieved and renewed learning correction coefficient αo, the feedback correction coefficient α set by said feedback correction coefficient setting means and the retrieved acceleration or deceleration correction coefficient Kacc or Kdcl, driving pulse signal output means for putting out the driving pulse signal corresponding to the fuel injection quantity Ti to said fuel injection means, air-fuel ratio deciding means for operating the air-fuel ratio of the air-fuel mixture at the time when acceleration or deceleration of the engine is detected by said fourth detecting means and comparing the operated air-fuel ratio with the target air-fuel ratio corresponding to the driving state of the engine, and acceleration and deceleration correction coefficient renewal means for renewing the acceleration or deceleration correction coefficient to the new acceleration or deceleration correction coefficient corresponding to the driving state of the engine, which is stored in said second memory means, based on the result of the decision made by said deciding means so that the deviation of the operated air-fuel ratio from the target air-fuel ratio is eliminated, said fourth detecting means comprising means for detecting that a change of the opening degree of a throttle valve arranged on an intake passage of the engine exceeds a predetermined value, said fourth detecting means further comprising means responsive to change of car speed within a predetermined time period and to change of engine speed, together with said means for detecting the opening degree of said throttle valve, for detecting said acceleration or deceleration of the engine.

Claim 6

An apparatus for learning control of an air-fuel ratio of an air-fuel mixture in an electronically controlled fuel injection type internal combustion engine, which comprises means for detecting a driving state of the engine, which includes at least first detecting means for detecting a flow quantity Q of air sucked in the engine, second detecting means for detecting a rotation speed N of the engine, third detecting means for detecting a concentration of the exhaust component so as to detect the actual air-fuel ratio λ of the air-fuel mixture sucked in the engine and fourth detecting means for detecting acceleration or deceleration of the engine, fuel injection means for injecting and supplying a fuel to the engine in an on-off maner in response to a driving pulse signal, basic fuel injection quantity determining means for operating a basic injection quantity Tp of the fuel to be supplied to the engine based on the flow quantity Q of air sucked in the engine, which is put out by said first detecting means, and the engine rotation speed N put out by said second detecting means, random access first memory means in which the learning correction coefficient αo for correcting said basic fuel injection quality Tp is prestored in advance according to the driving state of the engine, learning correction coefficient retrieval means for retrieving the learning correction coefficient αo from said first memory means according to the actually detected driving state of the engine, feedback correction coefficient setting means for increasing or decreasing by at least a predetermined integration component unit a feedback correction coefficient α so that the actual air-fuel ratio λ put out by said third detecting means is brought close to the present target air-fuel mixture λt, learning correction coefficient renewal means for setting a new learning correction coefficient, which is operated based on the feedback correction coefficient α set by said feedback correction coefficient setting means and the learning correction coefficient αo retrieved by said learning correction coefficient retrieval means according to the detected driving state of the engine, as the corresponding learning correction coefficient αo of said first memory means, clamping means for clamping the feedback correction coefficient α of the feedback correction coefficient setting means when acceleration or deceleration of the engine is detected by said fourth detecting means and stopping the feedback control, random access second memory means in which acceleration and deceleration correction coefficients Kacc and Kdcl for increasing or decreasing and correcting the fuel injection quantity at the time of acceleration or deceleration according to the driving state of the engine are pre-stored in advance, acceleration and deceleration correction coefficient retrieval means for retrieving the acceleration or deceleration correction coefficient Kacc or Kdcl from said second memory means according to the driving state of the engine when acceleration or deceleration of the engine is detected by said fourth detecting means, fuel injection quantity operating means for operating a fuel injection quantity Ti by correcting the basic fuel injection quantity Tp based on the retrieved or retrieved and renewed learning correction coefficient αo, the feedback correction coefficient α set by said feedback correction coefficient setting means and the retrieved acceleration or deceleration correction coefficient Kacc or Kdcl, driving pulse signal output means for putting out the driving pulse signal corresponding to the fuel injection quantity Ti to said fuel injection means, air-fuel ratio deciding means for operating the air-fuel ratio of the air-fuel mixture at the time when acceleration or deceleration of the engine is detected by said fourth detecting means and comparing the operated air-fuel ratio with the target air-fuel ratio corresponding to the driving state of the engine, and acceleration and deceleration correction coefficient renewal means for renewing the acceleration or deceleration correction coefficient to the new acceleration or deceleration correction coefficient corresponding to the driving state of the engine, which is stored in said second memory means, based on the result of the decision made by said deciding means so that the deviation of the operated air-fuel ratio from the target air-fuel ratio is eliminated, said fourth detecting means comprising means for detecting that a change of the opening degree of a throttle valve arranged on an intake passage of the engine exceeds a predetermined value, said fourth detecting means further comprising means responsive to change of car speed within a predetermined time period and to change of engine speed, together with said means for detecting the opening degree of said throttle valve, for detecting said acceleration or deceleration of the engine.