Idling speed control system for internal combustion engines
An idling speed control system for controlling idling rotational speed of an internal combustion engine having an intake passage and a throttle valve arranged is described. It consists of: vacuum-operated actuator means having a vacuum chamber, and a diaphragm defining the vacuum chamber, and a diaphragm defining the vacuum chamber and operatively connected to the throttle valve for controlling opening and closing thereof in response to pressure in the vacuum chamber; change-over control valve means operatively connected to the vacuum-operated actuator means for supplying the vacuum chamber, selectively, with a first control pressure or opening the throttle valve and a second control pressure for closing the throttle valve; electronic control means operatively connected to the engine and the change-over control valve means. Valve opening-correcting means operatively connected to the throttle valve and being responsive to at least one predetermined external load applied on the engine for correcting to a large opening; the electronic control means being adapted to actuate the valve opening-correcting means to increase the opening of the throttle valve which is determined by the change-over control valve means in response to the on-off control pulse signal, when the electronic control unit halts the control of the idling rotational speed of the engine for the predetermined period of time.
- Assignee:
- Honda Giken Kogyo K.K. Tokyo
- Patent Number(s):
- US 4693220
- OSTI ID:
- 5958933
- Country of Publication:
- United States
- Language:
- English
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Idling speed control system for internal combustion engines
Idling speed control system for internal combustion engines