JPH027234Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is an internal combustion engine in which the intake pipes leading from the surge tank or air cleaner to the cylinders are independent for each cylinder, and each independent intake pipe is provided with a throttle valve. The present invention relates to an air control valve provided for an independent intake system of an internal combustion engine.

BACKGROUND ART In an independent intake system for an internal combustion engine, intake pipes that guide intake air from a surge tank or an air cleaner to each cylinder are independent from each other, but in some systems, the intake pipes are connected to each other. For example, since the length of the intake passage to each cylinder is different, the amount of air to each cylinder is different. Publication No. 137516, JP-A-Sho
58-57066), a communication pipe for obtaining an average intake pressure that averages the intake pressure to obtain the original pressure of the brake booster, an air introduction pipe for a first idle to increase rotation during cold starting. (For example, Utility Model Application Publication No. 57-117721).

Problems that the invention aims to solve However, each of these can only satisfy a single required function of the intake system. For example, in the example of a balance tube, the amount of intake air at idle in each intake pipe is However, it is not possible to satisfy multiple required functions of the intake system, which vary depending on the operating state of the internal combustion engine. For this reason,
It is not possible to combine these intake systems with electronic control and control them according to the various operating conditions of the internal combustion engine, and even if the control is provided, it is only functional, so it is not possible to apply electronic control. Not suitable.

Furthermore, in the conventional intake system, even if the intake pipes are connected to each other, the amount of air taken into each intake pipe is independent of each intake pipe, and there is a problem in that it is difficult to adjust the amount of air taken into each intake pipe.

In order to solve the above problems, the present invention provides an air control valve that satisfies various required functions, improves controllability, and enables electronic control in internal combustion engines equipped with independent intake systems. The purpose is to

Means for Solving the Problem The air control valve of the present invention that meets this purpose is such that the intake pipe leading from the surge tank or air cleaner of the internal combustion engine to the cylinder is independent for each cylinder, and the independent intake pipe and each throttle valve are connected to each cylinder. A valve connected to an independent intake system of an internal combustion engine having at least one fresh air intake port communicating upstream of the throttle valve and a connecting port communicating with the intake pipe of each cylinder downstream of the throttle valve. The valve body has a port that creates three states: a state where each cylinder operates as an independent intake, a state where each cylinder is connected and is not an independent intake, and a state where fresh air is supplied to each cylinder. It consists of an air control valve.

Function In the air control valve configured in this way, the valve is rotated within the valve body to change the matching mechanism between the port provided in the valve and the fresh air intake port and connection port provided in the valve body. As a result, three states can be created: a state in which the air intake operates as an independent intake, a state in which each cylinder is not an independent intake in communication, and a state in which fresh air can be supplied to each cylinder. In the independent intake state, it is possible to ensure the independent response inherent to the independent intake system, and by communicating each cylinder and operating at deceleration in the non-independent intake state, it is possible to improve engine braking and reduce negative pressure to the brake booster. can be ensured uniformly,
Also, when fresh air is supplied to each cylinder, fast idle and idle speed control are possible.

Therefore, one air control valve can satisfy a plurality of required functions, and by rotating the valve under electronic control via an actuator, application of electronic control becomes possible.

Embodiments Hereinafter, preferred embodiments of the air control valve according to the present invention will be described with reference to the drawings.

Figures 1 to 5 show the air control valve according to the embodiment of the present invention, Figure 6 shows its operating state, and Figures 7 and 8 show the air control valve installed in a four-cylinder internal combustion engine. It shows.

First, in FIGS. 7 and 8, each cylinder 2 of the internal combustion engine 1 is connected to a surge tank or air cleaner 3 by an independent intake pipe 4. As shown in FIG. Reference numerals 4a, 4b, 4c, and 4d indicate independent intake pipes. Each intake pipe 4a, 4b, 4c, 4d is provided with a throttle valve 5, which is opened and closed simultaneously by a rod 6. Code 5a, 5b, 5c, 5d
1 shows each throttle valve provided in each intake pipe 4a, 4b, 4c, and 4d. The independent intake pipes 4 and the throttle valves 5 provided in each intake pipe constitute an independent intake system.

7 indicates an air control valve, and as shown in FIGS. 1 to 5, the air control valve 7 is connected to each intake pipe 4a, 4b, 4c, 4d.
The valve body 8 has a cylindrical body extending over the entire length of the valve body 8, and a valve 9 rotatably mounted within the valve body 8. The valve body 8 has at least one fresh air intake port 10, which communicates with an intake passage upstream of the throttle valve 5 via a communication pipe 11. Further, the valve body 8 has a connecting port 12 that communicates with the intake pipe 4 of each cylinder. Reference numerals 12a, 12b, 12c, and 12d indicate connection ports that communicate with the intake pipes 4a, 4b, 4c, and 4d, respectively. The valve 9 is made of a cylindrical body with both ends closed, and has a communication space 13 inside. Further, the valve 9 has a fresh air intake port 14 of approximately the same size as the fresh air intake port 10 at a position corresponding to the fresh air intake port 10 of the valve body 8,
A connection port 15 extending in the circumferential direction is provided at a position corresponding to the connection port 12 of the valve body 8 . Reference symbols 15a, 15b, 15c, and 15d indicate ports corresponding to the connection ports 12a, 12b, 12c, and 12d, respectively. Ports 14 and 15 of the valve 9 are connected to the fresh air intake port 10 of the valve body 8.
Depending on the positional relationship with respect to the connection port 12, the air control valve 7 is provided at a position where it can exhibit the following three states. That is, in FIG. 3, by rotating the valve 9 into the valve body 8, the connecting ports 12a, 12b, 12 are opened.
This shows a state in which the intake pipes 4a, 4b, 4c, and 4d operate as independent intakes, with the intake pipes 4a, 4b, 4c, and 4d being blocked by the wall 9a of the valve 9. FIG. 4 shows that by rotating the valve 9 into the valve body 8, the fresh air intake port 10 is blocked by the wall 9a of the valve 9, and each connection port 12a, 12b, 12c, 1
2d are connection ports 15a, 15b, 15c,
15d, and each cylinder is in communication with each other, showing a state in which air intake is not independent. FIG. 5 shows that by rotating the valve 9 into the valve body 8,
The fresh air intake port 10 is opened by a port 14 for fresh air intake, and each connection port 12a, 12b, 12
c, 12d are ports 15a, 15b for each connection,
15c and 15d are opened, and fresh air can be supplied to each cylinder.

One end of the valve 9 extends outside the valve body 8, and a lever 16 is fixed there. The lever 16 pivots the valve 9 into the valve body 8, which is actuated by an actuator 17, as shown in FIG. The actuator 17 is electrically connected to an electronic control unit (ECU) 18, and its rotation is controlled by the ECU 18.
ECU18 includes water temperature sensor 19 and air cleaner 3
Air temperature sensor 21, throttle sensor 22, pressure sensor 23, and distributor 2 attached to the
The actuator 17 is electrically connected to the actuator 17, and the operating state is determined based on the signals from these, and a rotation signal corresponding to the operating state is sent to the actuator 17.

In the air control valve 7 of the above embodiment, the valve 9 is of a rotating type, but the valve 9 may be of a structure that slides in the axial direction.

Next, the operation of the apparatus of the above embodiment will be explained.

The ECU 18 includes a water temperature sensor 19, an air temperature sensor 21, a throttle sensor 22, a pressure sensor 23,
Upon receiving the signal from the distributor 24, the actuator determines the operating state of the internal combustion engine, such as the load state, rotation speed, warm-up state, etc., and operates the actuator so as to satisfy the required functions of the air control valve 7 necessary for each operating state. 17, and the air control valve 7 is activated by actuating the actuator 17.
Change the position of valve 9.

First, under normal operating conditions except when idling, the valve 9 is in the position shown in Fig. 3, and each intake pipe 4a, 4
b, 4c, and 4d are set to operate as independent intakes. This provides good output performance.

Next, when the engine is idling, the valve 9 is in the position shown in FIG. 4, and the intake pipes 4a, 4b, 4c, and 4d are in a communicating state and are not in a state of independent intake.
In this state, the fresh air intake port 10 is connected to the wall 9a of the valve 9.
Since the air is blocked by the air, there is no intake of fresh air. During idling, the amount of intake air into the cylinder 2 is small and the amount of intake air in each cylinder tends to vary, but the intake pipes 4a, 4b, 4c, and 4d communicate with each other through the communication space 13 of the air control valve 7. each intake pipe 4a, 4b, 4c, 4d.
The amount of intake air is balanced, and the same effect as that of a conventional balance tube can be obtained.

Next, during a cold start, the valve 9 is in the position shown in FIG. 5, and the intake pipes 4a, 4b, 4c, and 4d are placed in communication, and the fresh air intake port 10 is opened. For this reason, each intake pipe 4
a, 4b, 4c, and 4d are communicated with each other to balance the intake air amount of each cylinder 2, and fresh air from upstream of the throttle valve 5 is connected to the fresh air intake port 10 and the communication space 1.
3 to each cylinder 12, increasing the amount of intake air. This improves startability during cold starting.

Figure 6 shows how each cylinder 2 passes through the air control valve 7 when the air control valve 7 is installed.
2 shows the relationship between the amount of intake air Q drawn into the valve 9 and the rotation angle θ of the valve 9. In state A where the air intake is operated as an independent intake, the amount of intake air Q through the air control valve is 0, and in state B where each cylinder 2 is connected and the intake is not independent, the amount of air passing through the communication space 13 is Q ₁
In state C, in which fresh air is supplied to each cylinder 2, an intake air amount of _Q2 is obtained because the introduced fresh air increases in addition to _Q1 .

Effects of the invention As is clear from the above explanation, when using the air control valve 7 of the invention, a plurality of various functions required of the intake system depending on the operating condition of the internal combustion engine are satisfied, and the controllability of the intake system is improved. In addition to improved performance, when combined with an electronic control device, electronic control is easily possible. Also,
The amount of intake air can be adjusted by adjusting only the seven air control valves, and the effect of simplifying the adjustment can also be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an air control valve according to an embodiment of the present invention, Fig. 2 is a side view of the air control valve of Fig. 1, and Fig. 3 is a view taken along the - line of the air control valve of Fig. 1. FIG. 4 is a cross-sectional view of the air control valve in FIG. 1 in a non-independent intake state; FIG. 5 is a cross-sectional view of the air control valve in FIG. 1 for supplying fresh air. Fig. 6 is a diagram showing the relationship between the valve rotation angle θ and the amount of intake air Q via the air control valve, and Fig. 7 shows the system when the air control valve shown in Fig. 1 is installed in an internal combustion engine. FIG. 8 is a plan view of the intake system of the device shown in FIG. 7. 1... Internal combustion engine, 2... Cylinder, 4, 4a, 4
b, 4c, 4d...Intake pipe, 5, 5a, 5b, 5
c, 5d... Throttle valve, 7... Air control valve, 8... Valve body, 9... Valve, 9a
... Valve wall, 10 ... Fresh air inlet, 11 ...
Communication pipe, 12, 12a, 12b, 12c, 12d
... Connection port, 13 ... Communication space section, 14, 15,
15a, 15b, 15c, 15d...Port, 1
7... Actuator, 18... ECU.

Claims (1)

[Scope of utility model registration request] An intake pipe leading from a surge tank or an air cleaner to a cylinder of an internal combustion engine is connected to an independent intake system of an internal combustion engine that is independent for each cylinder and each of the independent intake pipes is equipped with a throttle valve, and is communicated upstream of the throttle valve. The valve body includes at least one fresh air intake port and a connection port downstream of the throttle valve and communicating with the intake pipe of each cylinder, and in the valve body there is a valve body that operates as an independent air intake, and a connection port that is connected to the intake pipe of each cylinder downstream of the throttle valve. An air control valve characterized by having a valve body having a port that creates three states: a state in which fresh air is communicated to each cylinder, a state in which fresh air is not independently taken in, and a state in which fresh air is supplied to each cylinder.