Method and system for controlling idle speed in an internal comb

Details Method and system for controlling idle speed in an internal comb Method and system for controlling idle speed in an internal comb

1984-05-04

1985-12-10

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123585, 123588, 123179G, F02D 500, F02D 902, F02M 300

Patent

active

045572348

ABSTRACT:
A bypass passage bypassing a throttle valve and communicating a portion upstream of the throttle valve with a portion downstream of the throttle valve is blocked when an engine speed is increased to the upper limit value or more of a predetermined range or the bypass passage is opened when the engine speed is decreased to the lower limit value or less of the predetermined range, whereby the engine speed during idling is controlled to a value within the predetermined range. An idle speed is stabilized by opening the bypass passage immediately after the start and during warm-up process, where the engine speed is particularly instable during idling. Furthermore, the period of time of opening or blocking the bypass passage is shortened in accordance with the increase in a difference between the upper or lower limit of the predetermined range and the engine speed, whereby the engine speed is controlled so as to be quickly to a value within the predetermined range.

REFERENCES:
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patent: 4498436 (1985-02-01), Horiuchi

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