Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...
Patent
1985-08-29
1988-03-22
Dolinar, Andrew M.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
123339, 123423, 123424, F02P 515
Patent
active
047321253
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an output torque control system for controlling the output torque of an internal combustion engine in accordance with engine load and, more particularly, to an output torque control system which can improve the response time of engine output torque control with respect to engine load variations during idling, coasting or other engine operating conditions where the throttle valve is fully closed or at an angle less than a predetermined value.
PRIOR ART
As well known in the art, the output torque of an internal combustion engine is dependent upon the amount of fuel to the engine, the amount of air to the engine, engine rotation frequency, ignition timing and other engine operating parameters. On the other hand, the torque demanded for the engine is dependent upon engine acceleration and other engine operating conditions and also the conditions of operation of accessories such as an air conditioner.
When the throttle valve is fully closed or at an angle less than a predetermined value, the engine load is substantially zero or less and thus the torque demanded for the engine is small. Under this condition, the air flow through the main intake passage connected through a throttle chamber to the respective cylinders of the engine is a sonic flow the rate of which is constant, and the engine rotation frequency varies in accordance with the amount of air flow through an auxiliary air passage. The amount of air flow through the auxiliary air passage is controlled in accordance with engine operating conditions including engine load and the conditions of operation of the accessories such as an air conditioner. Such an auxiliary air induction control system is disclosed, for example, in U.S. Pat. Nos. 4,365,599, 4,406,261, 4,345,557, 4,402,289, 4,406,262, and 4,344,398, all of which are granted to Kenji Ikeura. In these U.S. patents granted to Ikeura, the amount of air through the auxiliary air passage is controlled by means of an auxiliary air control valve (AAC) which is controlled by an electrically controlled vacuum control modulaor valve (VCM).
On the other hand, it is the conventional engine control practice to control the ignition timing as a function of engine rotation frequency and induction passage air flow rate during engine normal operation and as a function of engine rotation frequency during engine idle operation where the rate of air flow through the induction passage is substantially constant. When, under such a condition, the position of the transmission and/or the clutch is changed or the air conditioner switch is turned on, the engine load changes and the engine rotation frequency changes with a change of demanded torque. The amount of air delivered to the engine changes with a time lag relative to an engine rotation frequency change due to the influence of induction passage volume and cylinder stroke volume. During a transition where the amount of air delivered to the engine changes with an engine rotation frequency change, the torque demanded for the engine is not in coincidence with the actual torque, resulting in unstable engine operating conditions.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an engine torque control system which is free from difficulties attendant upon the conventional engine torque control systems and has an improved response time relative to an engine load change.
It is a second and more specified object of the present invention to provide an engine torque control system which can control the ignition timing in accordance with a change of the torque demanded for the engine in a manner to improve the transition response time when the engine load varies.
It is another specified object of the present invention to provide an engine torque control system which has an improved response time relative to an engine load change at engine idling and other engine operating conditions where the throttle valve is fully closed or at an angle less than a predetermined value.
It is still another ob
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Dolinar Andrew M.
Nissan Motor Company Limited
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