Idle speed control system for internal combustion engine

Details Idle speed control system for internal combustion engine Idle speed control system for internal combustion engine

1998-09-11

2000-03-14

Tanner, Harry B.

Refrigeration

Automatic control

Responsive to vehicle body motion or traction

623231, 12333917, F02D 4108

Patent

active

060356529

ABSTRACT:
An idle speed control system for an internal combustion engine comprises a discharge pressure sensor to detect a discharge pressure of a compressor of an air conditioner, a predicted discharge pressure calculating section to predict a discharge pressure under a condition wherein the air conditioner is steady and ON based on a discharge pressure memorized when the air conditioner was OFF. During a predetermined period after an air conditioner switch turns ON, a control unit calculates a torque correction quantity based on the predicted discharge pressure and after the predetermined period calculates the torque correction quantity based on the actual current detected discharge pressure. Moreover, when the air conditioner switch turns "from ON to OFF" and "from OFF to ON" for a short period, the control unit calculates the torque correction quantity based on a previous actual discharge pressure obtained when the air conditioner switch was ON, instead of on the predicted discharge pressure.

REFERENCES:
patent: 4976589 (1990-12-01), Ide
patent: 5249559 (1993-10-01), Weber et al.
patent: 5265571 (1993-11-01), Sodeno
patent: 5285649 (1994-02-01), Yamanaka et al.
patent: 5752387 (1998-05-01), Inagaki et al.
patent: 5806485 (1998-09-01), DeGeorge

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