JPH02163416A - Intake control valve device for engine - Google Patents

Abstract

PURPOSE:To prevent the sharp variation of the swirl state and the intake air quantity by installing each valve body which opens and closes each half part of the sectional surface of a main passage onto two valve shafts installed in parallel, crossing each main passage of each branch of an intake manifold and connecting each actuator onto two valve shafts and opening and closing two pairs of control valves according to the load. CONSTITUTION:Each flat plate shaped valve body 12, 15 which opens and closes each half part of the sectional surface of a main passage 8 is installed for each main passage 8 onto each valve shaft 11, 14 which is arranged, crossing the center of each main passage 8 of the branch 4 of an intake manifold 3. Further, the rods 18 and 22 fixed onto the diaphragms 17 and 21 of two actuators 16 and 20 which are operated by the negative pressure of the intake manifold 3 are respectively connected with the levers 24 and 25 fixed onto the valve shafts 11 and 14. Therefore, each half part of the main passage 8 is opened and closed by two pairs of control valves 10 and 13 driven by the actuators. Therefore, the combustion speed and combustion state are sharply changed by sharply changing the swirl state, and the extreme reduction of torque is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake control valve device for generating swirl in a combustion chamber of an engine.

(Prior Art) As one of the means to improve the combustion state by swirling the air-fuel mixture supplied to the combustion chamber of the engine,
Each branch of the intake manifold connected to each combustion chamber is divided into a main passage for high speeds and a sub passage for low speeds, and a control valve is installed in the main passage, and the control valve is closed at low speeds to prevent swirl. There is a wide range of technology to increase charging efficiency by increasing the combustion speed and opening the control valve at high speeds.The control valve is installed on a single valve shaft installed across each main passage. Normally, a flat plate-shaped valve body is attached to each main passage, and each valve plate is opened and closed simultaneously using an actuator operated by negative pressure in the intake manifold (for example, Japanese Patent Application Laid-Open No. 54-99826 reference).

The valve body of the control valve is placed in the fully closed position at low speeds to generate a strong swirl, and a portion of the control valve is placed in the fully closed position to generate a strong swirl, while avoiding sudden changes in the amount of intake air and generating the required swirl in the load range. Many have a cutout so that the swirl can be adjusted by the air passing through the cutout. However, with this configuration in which swirl is generated and controlled by the shape and position of each valve element, it is not possible to always generate a swirl of appropriate strength in response to the fluctuating engine load. The desired effect could only be achieved in a specific load area.

In addition, commonly used negative pressure actuators are configured to open and close the control valve based on the force relationship exerted on the diaphragm by the negative pressure of the intake manifold and the spring. When this happens, all the strokes are sucked for 2 minutes at once, and the spring force on the other hand creates a negative pressure il'.
When the valve is turned on, the entire stroke is pushed back by 2 minutes at once, so the control valve is placed in either the fully closed or fully open position to control the main passage on and off. For this reason.

As the control valve opens and closes, the amount of intake air and its flow direction change rapidly, and the swirl condition changes rapidly, causing sudden changes in the combustion speed and combustion state.

Furthermore, for that reason, the torque is extremely reduced and driving with these? The problem is that it tends to become extremely unstable.

(Problem 1-a to be solved by the invention) The present invention has the problem that the desired swirl effect can only be obtained in a specific load range, and that the swirl condition and intake air amount change rapidly, which significantly impairs operation. Easy to stabilize
This solves the technical problem of

(Means for solving problems) The present invention aims to solve the above technical problems.

Two valve shafts are installed parallel to each other across each main passage of each branch of the intake manifold, which is divided into a main passage and a sub passage, and a valve body is provided that opens and closes approximately half of the cross section of the main passage. An actuator is attached to each of the valve shafts for each main passage, and is connected to an actuator that causes each of the two valve shafts to perform different opening and closing operations. This measure was taken.

(Function) In the low speed range of the engine, both sets of control valves close to minimize the area of the main passage, and in the high speed range, both sets of control valves open to maximize the area of the main passage. In the medium speed range, it opens and closes according to the load.

For example, create a region where one control valve is closed and the other control valve is open to prevent sudden changes in the swirl state or intake air amount.

(Embodiment) To explain the present invention in detail with reference to the drawings, in FIG. Grilling room 6
The fuel is supplied by a fuel injection valve or a carburetor (not shown). 7 is an exhaust manifold.

Branch 4 has main passage 8 for high speed and sub passage 9 and K for low speed.
Each main passage 80 is divided into two parts, and the passage area of each main passage 80 is controlled simultaneously by two sets of control valves 10, 13 that open and close separately.

The control valve 10.13 has a flat valve body 12.15 for opening and closing each half of the cross section of the main passage 8 on each valve shaft 11.14 arranged across the center of each main passage 8. It has a configuration in which it is attached to each main passage 8, and each valve plate 12, 15 has a notch of 12 m, 15 m. The valve shafts 11 and 14 are arranged close to each other and parallel to each other on the upstream and downstream sides of the main passage 8, and the diaphragms 17 and 21 of the two actuators 16 and 20 are operated by the negative pressure of the intake manifold 3.
Rods 18.22 fixed to the valve stems 11.22 are respectively connected to levers 24.25 fixed to the valve stems 11.14. These two actuators 16, 18 are connected to each other by the diaphragm 1.
By making the effective diameters of the levers 7 and 21 different and the elastic modulus of the spring 19.23 different, the operating characteristics are said to be different. .13 operating characteristics can be changed.

In this embodiment configured as described above, when the engine 5 is idling and operating at low load and low speed, the negative pressure in the intake manifold 3 is high, so that both the diaphragms 17 and 21 are connected to the spring 19.
．． 23 and pull the levers 24 and 25, both sets of control valves 10 and 13 are closed to minimize the area of the main passage 8 (Fig. 4), increase the fuel tp of the engine 5, and create a strong swirl in the chamber 6. is occurring. When the engine 5 enters the medium-speed operating range, the negative pressure in the intake manifold 3 drops below the level described above, and at this time, one of the control valves 10 opens as the spring 19 of its actuator 16 pushes the lever 24. One control valve 13 is still placed in the closed position by the diaphragm 21 of its actuator 20 pulling the lever 25, leaving the main passage 8 with an intermediate area (FIG. 5). As a result, the swirl in the combustion chamber 6 of the engine 5 becomes considerably weaker. Sara K.

When the engine 5 enters the high-speed operating range, the negative pressure in the intake manifold 3 further decreases, and the control valve 13, which had been closed, opens when the spring 23 of its actuator 20 pushes the lever 25, opening the main passage 8 to the maximum. It is defined as the area (Figure 6).

In this way, the actuator 16.2 is operated so that the two sets of control valves 10.13 open and close in different operating ranges of the engine 5.
If the operating characteristics of 0 are made different, 1 actuator 1
6. Even if a negative pressure type is used as the valve plate 1λ15, the swirl condition or the amount of intake air will not change suddenly.
By providing 15 m and 15 m, the swirl can be adjusted to various characteristics.

(Effects of the Invention) According to the present invention, each main passage of the branch is opened and closed approximately half by half by two sets of control valves driven by separate actuators, so that a strong swirl can be generated. A region where the passage area is approximately halved can be arbitrarily created between the high speed region where air is required, and the amount of intake air and the direction of air flow do not change suddenly. For this reason, the swirl state changes suddenly and the combustion rate increases.
This eliminates the possibility of sudden changes in combustion conditions and extremely low torque, allowing the engine to operate stably.

[Brief explanation of the drawing]

Figures 1 and 2 are layout diagrams of an engine/engine intake system in which the present invention is implemented, Figure 3 is a cross-sectional view showing an embodiment of the present invention, and Figures 4, 5, and 6 are operational diagrams. It is an explanatory diagram. 3...Intake manifold #4...Branch. 5... Engine/, 8... Main passage, 9.
...Sub-passage, 10.13...Control valve,
11.14...Valve stem, 12°15...
・Valve plate, 16.20...actuator.

Claims (1)

[Claims] Two valve shafts are installed parallel to each other across each main passage of each branch of the intake manifold, which is divided into a main passage and a sub passage, and open and close approximately half of the cross section of the main passage. An intake control valve for an engine, characterized in that a valve body is attached to each of the valve stems for each main passage, and actuators that perform separate opening and closing operations are connected to the two valve stems, respectively. Device.