JPH11141439A - Valve seat for idling engine speed control valve of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the air flow rate when a valve element is stroked to full open side by constantly keeping the opening area between a valve element for controlling idling engine speed and a ring valve seat opposed thereto. SOLUTION: An annular movable valve seat VS 1 is preliminarily subjected to the same working on the whole circumference, and it is further subjected to a bore working corresponding to a seat hole, and the side surface thereof is also worked so that the passage area of an air inlet port 4 can be ensured. On the other hand, a body 1 is threaded so that the movable valve seat VS 1 can be assembled by screwing. The movable valve seat VS 1 can be slid in the axial direction of the screwing hole by assembling the movable valve seat VS 1 to the body 1 by screwing, and the opening area between an idling engine speed control valve and the ring valve seat VS 1 opposed thereto can be changed to regulate the air flow rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle speed control device for an internal combustion engine for a motor vehicle, and more particularly to an axially advanced / retracted valve provided in a bypass air passage which bypasses a throttle valve. The present invention relates to an apparatus for controlling the amount of bypass air by changing the amount.

[0002]

2. Description of the Related Art In conventional idle speed control,
In adjusting the opening area between the valve element and the annular valve seat, a method is adopted in which a reference position for the stroke of the valve element is set on the fully open side or the fully closed side of the valve element.

[0003] In the fully open setting method, when the valve element has a full stroke to the fully closed side, the opening area between the valve element and the annular valve seat on the fully closed side varies, so that a constant air flow rate is obtained. It was difficult to control.

[0004]

When the valve element for controlling the idle speed makes a full stroke toward the fully closed side when the valve element is set to the fully open side, and when the valve element approaches the opposed annular valve seat, it is fully opened. The variation set on the side directly affects the fully closed side, and the opening area between the valve body and the facing annular valve seat varies. Therefore, the air flow rate fluctuates and the idle speed also fluctuates.

An object of the present invention is to set a reference position for stroke of a valve element for controlling an idle speed on a fully open side of the valve element, and to set a circle facing the valve element even when the valve element is fully stroked. It is an object of the present invention to provide an idle speed control valve valve seat for an internal combustion engine, in which an opening area with an annular valve seat can be adjusted to be constant and an air flow rate can be stabilized.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the position of the facing annular valve seat is adjusted so that the valve body for controlling the idle speed and the facing annular valve seat can be separated. The opening area between them can be kept constant.

[0007]

FIG. 1 shows the overall structure of the present valve mechanism.

The idle speed control valve mechanism of this embodiment has a step motor type mechanism using a coil electromagnetic force controlled by the control unit 8 as a driving force source, and the mechanism is controlled to move forward and backward in the axial direction. An umbrella-shaped valve attached to the shaft 6 controls the opening area of the annular valve seat portion VS1 facing the umbrella-shaped valve to control the amount of flowing air.

The air passage provided with the valve mechanism VM is:
A bypass passage that branches from a main passage through which the main air flows to the cylinder after being metered by the throttle valve 2 after passing through the air cleaner of the engine. The branch position is upstream of the throttle valve 2 and the branch position is downstream of the throttle valve 2. It is.

The valve mechanism VM belongs to a body 1 having a bypass BP formed on the wall of the main passage MP. Body 1
, An annular valve seat VS is formed in the middle of the passage.

When a negative pressure acts on the negative pressure inlet 3 downstream of the throttle valve 2, the air inlet 4 branches from a main passage which passes through an engine air cleaner, is metered by the throttle valve 2, and flows to a cylinder. More air is introduced. At this time, the shaft 6 to which the idle speed control valve 5 is attached is axially advanced and retracted by the electromagnetic force of the coil 9 generated by an input signal from the control unit 8 via the terminal 7, and the idle speed control valve 5 is controlled. To control the opening area of the annular valve seat VS that faces the valve seat VS to control the amount of flowing air.

In the prior art, when controlling the opening area between the idle speed control valve 5 and the annular valve seat VS facing the same, the reference position when the idle speed control valve 5 makes a stroke is set to the fully open side. When the system is set to the full-closed side, the opening area between the idle speed control valve 5 and the annular valve seat VS that faces the fully-closed side when the full-stroke reaches the fully-closed side varies. It was difficult to control.

FIG. 2 shows a method of controlling the opening area on the fully closed side according to the present invention.

In the prior art, it is impossible to control the opening area on the fully closed side because the opposed annular valve seat VS is fixed. Therefore, this problem can be solved by incorporating the annular movable valve seat VS1 into the body 1 as a screw-in type member.

As shown in FIG. 3, the annular movable valve seat VS1 is previously machined to the entire circumference, and the inside diameter corresponding to the seat hole and the side surface can secure the passage area of the air inlet 4. It shall be processed.

On the other hand, the movable valve seat V
Screw processing is performed so that S1 is assembled by screwing.

In the above state, the movable valve seat VS1 can be slid in the axial direction of the screw-in hole by screwing the movable valve seat VS1 into the body 1 so as to face the idle speed control valve. The opening area with the annular valve seat VS1 can be changed, and the air flow rate can be adjusted.

[0018]

According to the present invention, by making the annular valve seat facing the idle speed control valve movable, it is possible to change the opening area on the opening side on the fully open side, and the air The flow rate can be adjusted.

Therefore, it is possible to keep the air flow rate at the time of starting the engine within a certain range, and it is effective in stabilizing the idle speed.

[Brief description of the drawings]

FIG. 1 is a structural diagram of an idle speed control valve according to an embodiment of the present invention.

FIG. 2 is a structural diagram showing control of an opening area on a fully closed side in FIG. 1;

FIG. 3 is a perspective view of a valve seat used in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Throttle valve, 3 ... Negative pressure inlet, 4 ... Air inlet, 5 ... Idle speed control valve, 6 ... Shaft, 7 ... Terminal, 8 ... Control unit, 9 ... Coil, V
M: valve mechanism, BP: bypass, VS: valve seat, V
S1: valve seat portion, MP: main passage.

Claims (1)

[Claims] 1. A valve for measuring air disposed in an air passage bypassing a throttle valve, a shaft to which the valve is attached, and a coil for driving the shaft in the axial direction by electromagnetic force. An idle speed control valve valve seat for an internal combustion engine at the time of engine start between the valve seat and an annular valve seat facing the shape of the valve body.