Idling speed control system for internal combustion engines
This patent describes an idling speed control system for controlling idling rotational speed of an internal combustion engine having an intake passage and a throttle valve arranged therein, comprising: vacuum-operating actuator means having a 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 for 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, the electronic control means being adapted (i) to generate an on-off control pulse signal having a pulse repetition period corresponding to rotational speed of the engine, one of on-period and off-period of the on-off control pulse signal having a predetermined constant value.
- Assignee:
- Honda Giken Kogyo K.K., Tokyo
- Patent Number(s):
- US 4774920
- OSTI ID:
- 6448602
- 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