Idle speed control system for internal combustion engine
First Claim
1. An idle speed control system for an internal combustion engine, comprising:
- an auxiliary air control valve operatively disposed in an auxiliary air passage which is communicated at its downstream end with an intake air passageway downstream of a throttle valve; and
means for controlling an amount of air flowing through said auxiliary air passage to control an idle speed of the engine under an idle operating condition, said air amount controlling means includingmeans for producing a model torque of a power output shaft of the engine in time series, in accordance with a target idle speed by using a model,means for detecting a torque of the power output shaft, andmeans for controlling an opening degree of said auxiliary air control valve in accordance with a first difference between said model torque and said detected torque so as to control the air flowing amount in the auxiliary air passage.
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Accused Products
Abstract
An idle speed control system for an automotive internal combustion engine having an intake air passageway through which intake air flow to be inducted into engine cylinders. The idle speed control system is comprised of an auxiliary air control valve operatively disposed in an auxiliary air passage which is connected with the intake air passageway in a manner to bypass a throttle valve. The amount of air flowing through the auxiliary air passage is regulated by controlling the opening degree of the auxiliary air control valve under an idle operating condition in order to control idle speed. The control of the auxiliary air control valve opening degree is accomplished in accordance with a difference between model and actual torques of a power output shaft of the engine. The model torque is produced in time series in accordance with a target idle speed by using a model.
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Citations
12 Claims
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1. An idle speed control system for an internal combustion engine, comprising:
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an auxiliary air control valve operatively disposed in an auxiliary air passage which is communicated at its downstream end with an intake air passageway downstream of a throttle valve; and means for controlling an amount of air flowing through said auxiliary air passage to control an idle speed of the engine under an idle operating condition, said air amount controlling means including means for producing a model torque of a power output shaft of the engine in time series, in accordance with a target idle speed by using a model, means for detecting a torque of the power output shaft, and means for controlling an opening degree of said auxiliary air control valve in accordance with a first difference between said model torque and said detected torque so as to control the air flowing amount in the auxiliary air passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An idle speed control system for an internal combustion engine comprising:
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an auxiliary air control valve operatively disposed in an auxiliary air passage which is communicated at its downstream end with an intake air passageway downstream of a throttle valve; and means for controlling an amount of air flowing through said auxiliary air passage to control an idle speed of the engine under an idle operating condition, said air amount controlling means including means for producing a model torque of a power output shaft of the engine in time series, in accordance with a target idle speed by using a model, means for detecting a torque of the power output shaft, means for calculating a first difference between said model torque and said detected torque, means for producing a model idle speed in time series, in accordance with said target idle speed by using a model, means for calculating a second difference between said model idle speed and an actual idle speed of the engine, and means for controlling an opening degree of said auxiliary air control valve in accordance with said first difference and said second difference so as to control the air flowing amount in the auxiliary air passage.
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Specification