Engine idle speed control device

Details Engine idle speed control device Engine idle speed control device

2002-05-02

2003-10-21

Solis, Erick (Department: 3747)

Internal-combustion engines

Engine speed regulator

Idle speed control

C123S339240, C123S337000

Reexamination Certificate

active

06634334

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an engine idle speed control device adapted to bypass an engine throttle valve to provide air to an engine combustion chamber, and, more particularly, to an engine idle speed control device adapted to improve starting ability when an engine is cold and to accurately effect engine idle control.
BACKGROUND OF THE INVENTION
FIG. 1
illustrates a conventional idle speed control device using a step motor. A throttle body
1
is mounted with an Idle Speed Control (ISC) passage
3
for bypassing a throttle valve
2
. The ISC passage
3
is equipped with an Idle Speed Control Actuator (ISA
4
) for controlling the opening of ISC passage
3
by way of step motor, and in parallel therewith, a Fast Idle Air Valve (FIAV
5
) is mounted to smooth engine start when the vehicle is cold-started. When the engine is cold-started, the FIAV(
5
) is in a state of opening the ISC passage (
3
), such that additional air is supplied to air provided through passage
3
and ISA(
4
), to thereby facilitate initial startup.
However, there is a problem in the engine idle speed control device thus described in that the ISA(
4
) and the FIAV(
5
) are mounted in parallel on a single ISC passage
3
. Thus, even if the opening of FIAV(
5
) is large, the air supplied to the combustion chamber via ISC passage
3
is restricted by the cross-sectional area of ISC passage
3
, such that full and smooth cold-starting of the engine cannot be accomplished in large displacement engines.
SUMMARY OF THE INVENTION
The present invention provides an engine idle speed control device that facilitates cold-starting, including in large displacement engines. In accordance with a preferred embodiment of the present invention, first and second passages are mounted on a throttle body to enable air flow bypassing the throttle valve. An ISA is mounted to control the opening of the first passage. Temperature valve means is mounted to control the opening of the second passage in response to engine temperature.


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