Engine with torque control

Details Engine with torque control Engine with torque control

1998-06-03

2001-01-02

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Combustion chamber means having fuel injection only

Combustible mixture stratification means

C123S305000, C123S399000, C123S478000, C123S568210

Utility Patent

active

06167863

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an engine with torque control.
BACKGROUND OF THE INVENTION
JP-A 62-110536 discloses a torque control technique for an internal combustion engine. According to this technique, a target throttle position or opening degree is determined after a retrieval operation based on a target engine torque and the engine speed. This technique proves to be effective in operating the engine at a predetermined air fuel ratio such as the stoichiometry.
It would be desirable to employ a control scheme in which an engine operates at air fuel ratio that varies with varying operating states. The above-mentioned technique does not meet demands imposed on the control scheme.
This is because the control scheme requires a technique to alter air fuel ratio with the engine operating performance, i.e., engine speed and torque, unaltered. Both a change in the engine throttle position and a change in fuel supply quantity are requested to occur concurrently to accomplish this task. For example, to alter air fuel ratio toward the lean side from the stoichiometry, it is requested that intake air quantity increases, while fuel supply quantity decreases.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, there is provided an engine comprising:
a combustion chamber;
an air intake passageway leading toward the combustion chamber;
a throttle valve within the air intake passageway;
a fuel injector communicating with the combustion chamber;
a throttle controller operable in response to an intake air control command to move the throttle valve;
a fuel controller operable in response to a fuel control command to open the fuel injector for injection of fuel into the combustion chamber; and
an engine controller for generating the intake air control command and the fuel control command,
said engine controller being operable to determine a target equivalence ratio for detected operating state of the engine,
the engine controller being operable to control a change between stratified charge combustion and homogeneous charge combustion,
the engine controller being operable to delay the target equivalence ratio, and
the engine controller being operable to determine the fuel control command in response to the delayed target equivalence ratio.
According to another aspect of the present invention, there is provided a control system for an internal combustion engine operable on stratified charge combustion or homogeneous charge combustion, comprising:
a basic target equivalent ratio generator for generating a basic target equivalent ratio for detected operating state of the engine;
a transfer operable to delay the basic target equivalence ratio;
a provisional target equivalence ratio generator for generating a provisional target equivalence ratio as determined as a function of the delayed basic target equivalent ratio that was determined during the previous operation cycle;
a comparator for determining whether or not a change between stratified charge combustion and homogeneous charge combustion has occurred based on the provisional target equivalence ratio; and
a target equivalence ratio generator for generating a target equivalence ratio for the current operation cycle in response to the result of determination whether or not change between stratified charge combustion and homogeneous charge combustion has occurred.


REFERENCES:
patent: 5931138 (1999-08-01), Uchida
patent: 5960765 (1999-10-01), Iida et al.
patent: 5988141 (1999-11-01), Uchida
patent: 882877 (1998-12-01), None
patent: 62-110536 (1987-05-01), None
patent: 5-248277 (1993-09-01), None
patent: 9-287513 (1997-11-01), None
patent: WO 96/36802 (1996-11-01), None
Patent Abstracts of Japan, vol. 017, No. 392 (Jul. 22 1993), abstract of JP-05-071381.
Patent Abstracts of Japan, vol. 013, No. 041 (Jan. 01 1989), abstract of JP-63-248938.

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