Learning control system of air-fuel ratio in electronic control engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsNobuyuki Kobayashi, Toshiaki Isobe, Nobuhisa Ohkawa, Takahide Kuma
Life of this patent
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Abstract
This system computes final fuel injection amount TAU on the basis of the following formula; TAU=A.times.TP+B+J where A : a first learning term B : a second learning term TP : basic fuel injection amount J : correction amount Learning control is effected by correcting the second learning term B during idling periods and by correcting the first learning term A when an engine has larger than a predetermined load.
Claims7
A system for learning control of the air-fuel ratio in an electronically controlled engine comprising:
- means for generating an indication of engine load;
- means for generating a ratio signal indicative of air-fuel ratio by monitoring exhaust gases of said engine;
- and
- processing means for:
- (1) determining a basic fuel injection amount, TP, as a predetermined function of engine load, (2) determining a final fuel injection amount, TAU, in accordance with TAU=AxTP+B+J wherein A is a first learning term, B is a second learning term and J is a correction amount, (3) correcting said first learning term A in response to said ratio signal when said engine has a load larger than a predetermined value, and (4) correcting said second learning term B in response to said ratio signal when said engine has a load smaller than said predetermined value.
A system for learning control of the air-fuel ratio in an electronically controlled engine comprising:
- means for generating an indication of engine load;
- means for generating a ratio signal indicative of air-fuel ratio by monitoring exhaust gases of said engine;
- and
- processing means for:
- (1) determining a basic fuel injection amount, TP, as a predetermined function of engine load, (2) determining a final fuel injection amount, TAU, in accordance with TAU=A.times.TP+B+J wherein A is a first learning term, B is a second learning term and J is a correction amount, (3) correcting said first learning term A by a predetermined amount in each of a series of predetermined periods in response to said ratio signal, said correcting function (3) occurring only when said engine has a load larger than a predetermined value, and (4) correcting said second learning term B by a predetermined amount in each of a series of predetermined periods in response to said ratio signal, said correcting function (4) occurring only when said engine has a load smaller than said predetermined value.
Dependencies are inferred from the claim text.