Engine power train control method and control apparatus for a vehicle
First Claim
1. An engine power train control method for a vehicle having an engine and an automatic transmission, comprising the step of:
- determining a fuel amount fed to the engine according to a position of an accelerator pedal of the vehicle and an engine speed of the engine for a fixed period during a transition between a first air-fuel ratio for a lean-burn operation and a second air-fuel ratio for a non-lean-burn operation of the engine.
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Accused Products
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.
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Citations
20 Claims
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1. An engine power train control method for a vehicle having an engine and an automatic transmission, comprising the step of:
determining a fuel amount fed to the engine according to a position of an accelerator pedal of the vehicle and an engine speed of the engine for a fixed period during a transition between a first air-fuel ratio for a lean-burn operation and a second air-fuel ratio for a non-lean-burn operation of the engine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An engine power train control method for a vehicle having an engine and an automatic transmission, comprising the step of:
determining at least one of a first air amount fed to the engine and a first fuel amount fed to the engine after completion of a transition of an air-fuel ratio, based on at least one of a second air amount fed to the engine and a second fuel amount fed to the engine immediately before the transition of the air-fuel ratio between a first air-fuel ratio for lean-burn operation and a second air-fuel ratio for non-lean-burn operation of the engine. - View Dependent Claims (8, 9)
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10. An engine power train control method for a vehicle having an engine and an automatic transmission, comprising the step of:
changing a command value specifying an air-fuel ratio of the engine stepwise during transition between a first air-fuel ratio for lean-burn operation and a second air-fuel ratio for non-lean-burn operation. - View Dependent Claims (11, 12, 13)
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14. An engine power train control apparatus for a vehicle having an engine and an automatic transmission, comprising:
determining means for determining a fuel amount fed to the engine according to a position of an accelerator pedal of the vehicle and an engine speed of the engine for a fixed period during transition between a first air-fuel ratio for lean-burn operation and a second air-fuel ratio for non-lean-burn operation of the engine. - View Dependent Claims (15, 16, 17, 18)
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19. An engine power train control apparatus for a vehicle having an engine and an automatic transmission, comprising:
determining means for determining at least one of a first air amount fed to an engine of the vehicle and a first fuel amount fed to the engine after a completion of a transition of an air-fuel ratio based on at least one of a second air amount fed to the engine and a second fuel amount fed to the engine immediately before the transition of the air-fuel ratio during transition between a first air-fuel ratio for lean-burn operation and a second air-fuel ratio for non-lean-burn operation of the engine. - View Dependent Claims (20)
Specification