Engine idling speed control system
First Claim
1. A system for controlling idling speed of an internal combustion engine, comprising;
- speed sensing means for sensing rotational speed of the engine;
determination means for determining whether the engine is in an idling state;
output adjusting means for adjusting engine output when the engine is determined to be in the idling state by said determination means;
memory means for storing a control variable of said output adjusting means in the form of a characteristic in which engine output rises approximately in proportion to a difference between a predetermined target idling speed and an actual idling speed with engine speed serving as a parameter;
control means responsive to outputs from said determination means and said speed sensing means for obtaining from said memory means a control variable corresponding to engine speed at idling, and for controlling said output adjusting means on the basis of said control variable;
load detecting means for detecting whether an external load is connected with the engine in operational relation; and
control variable characteristic changing means for changing characteristic of said control variable from said memory means responsive to output from said load detecting means.
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Accused Products
Abstract
A system for controlling idling speed of an internal combustion engine in which a speed sensor senses rotational speed of the engine. A determinator is provided for determining whether the engine is in an idling state. An output adjustor adjusts engine output when the engine is determined to be in the idling state by the determinator. A memory stores a control variable of the output adjustor in the form of a characteristic in which engine output rises approximately in proportion to a difference between a predetermined target idling speed and an actual idling speed with engine speed serving as a parameter. A control acts responsive to outputs from the determinator and the speed sensor for obtaining from the memory a control variable corresponding to engine speed at idling, and for controlling the output adjustor on the basis of the control variable. A load detector detects whether an external load is connected with the engine in operational relation; and a control variable characteristic changer changes characteristic of the control variable from the memory responsive to output from the load detector.
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Citations
11 Claims
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1. A system for controlling idling speed of an internal combustion engine, comprising;
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speed sensing means for sensing rotational speed of the engine; determination means for determining whether the engine is in an idling state; output adjusting means for adjusting engine output when the engine is determined to be in the idling state by said determination means; memory means for storing a control variable of said output adjusting means in the form of a characteristic in which engine output rises approximately in proportion to a difference between a predetermined target idling speed and an actual idling speed with engine speed serving as a parameter; control means responsive to outputs from said determination means and said speed sensing means for obtaining from said memory means a control variable corresponding to engine speed at idling, and for controlling said output adjusting means on the basis of said control variable; load detecting means for detecting whether an external load is connected with the engine in operational relation; and control variable characteristic changing means for changing characteristic of said control variable from said memory means responsive to output from said load detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for controlling idling speed of an internal combustion engine, comprising;
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an automatic transmission connected with the engine output shaft; speed sensing means for sensing rotational speed of the engine; determination means for determining whether the engine is in an idling state; intake air amount adjusting means for adjusting engine intake air amount when the engine is determined to be in the idling state by said determination means; memory means for storing a control variable of said intake air amount adjusting means in the form of a characteristic in which additional engine intake air amount rises approximately in proportion to a difference between a predetermined target idling speed and an actual idling speed with engine speed serving as a parameter; control means responsive to outputs from said determination means and said speed sensing means for obtaining from said memory means a control variable corresponding to engine speed at idling, and for controlling said intake air amount adjusting means on the basis of said control variable; transmission detecting means for detecting whether said automatic transmission is selected a drive range or whether it is selected a neutral range; and control variable characteristic changing means for changing characteristic of said control variable obtained from said memory means responsive to output from said transmission detecting means. - View Dependent Claims (10, 11)
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Specification