Engine power train control method and control apparatus for a ve

Details Engine power train control method and control apparatus for a ve Engine power train control method and control apparatus for a ve

1995-07-25

1997-07-01

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123478, 123486, F02D 4118, F02D 4126

Patent

active

056427093

ABSTRACT:
An engine power train control method and control apparatus for a vehicle having an engine and an automatic transmission is capable of quickly changing an air-fuel ratio to meet the requirements for exhaust gas without producing shocks and without reducing engine torque. An air-fuel ratio command value is varied stepwise for transition between an air-fuel ratio for lean-burn operation and a stoichiometric air-fuel ratio, and at the same time, the period following the completion of the stepwise variation of the air-fuel ratio command value, a basic fuel amount fed to the engine is varied stepwise from a value determined according to the air amount and an engine speed to a value determined according to a position of an accelerator pedal of the vehicle and the engine speed. In this way, shocks do not occur and the operability is improved, because the engine torque remains substantially constant through the air-fuel ratio transition.

REFERENCES:
patent: 4739483 (1988-04-01), Ina et al.
patent: 5190008 (1993-03-01), Yamasaki et al.
patent: 5209213 (1993-05-01), Miyashita et al.
patent: 5224454 (1993-07-01), Miyashita et al.
patent: 5295416 (1994-03-01), Miyashita et al.
patent: 5363826 (1994-11-01), Takaoka

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