KR20030048168A - Intake and exhaust valve of open and close apparatus - Google Patents

Abstract

PURPOSE: An intake and exhaust valve open/shut apparatus is provided to reduce vibration and noise by using the pressure of exhaust gas for opening/shutting the intake and exhaust valve, while achieving improved engine performance. CONSTITUTION: An intake and exhaust valve open/shut apparatus comprises a branch pipe(8) connected to an exhaust pipe(7); an exhaust gas supply pipe for distributing exhaust gas to the intake and exhaust valves of each cylinder from the branch pipe; the cylinder for receiving exhaust gas from each supply pipe; a valve operating piston reciprocating in a vertical direction within the cylinder, which is fixed at the top of a valve stem of each of intake and exhaust valves; an atmosphere communication pipeline for receiving exhaust gas from the exhaust gas supply pipe and emitting air to the atmosphere during the downward movement of the valve operating piston; supply solenoid valves for opening/shutting each of exhaust gas supply pipes; an exhaust gas return pipeline for connecting each of exhaust gas supply pipes and exhaust pipe, and returning and discharging the exhaust gas supplied during the upward movement of the intake and exhaust valves; return solenoid valves for opening/shutting the exhaust gas return pipeline; a high pressure tank connected to the branch pipe, which supplies compressed air to the cylinder during starting of engine; a tank open/shut solenoid valve(15) for opening/shutting the high pressure tank; and an electronic control unit(19) for controlling operation of solenoid valves.

Description

Intake and exhaust valve of open and close apparatus

The present invention relates to an intake and exhaust valve opening and closing device using the exhaust gas as a drive source.

The engine powered by using the heat energy obtained by burning the fuel has an intake and exhaust valve for introducing the combustion air into the combustion chamber and opening and closing the intake and exhaust ports formed in the cylinder head to discharge the exhaust gas generated after combustion. Doing.

Typically, a valve opening and closing device using a cam is used as a device for driving the intake / exhaust valve, and the cam opens and closes the intake / exhaust valve by pressing or releasing the intake / exhaust valve at the time of opening / closing of the valve by a cam shaft rotating in conjunction with the crank shaft. Doing.

However, since the conventional intake and exhaust valve opening and closing device is a kinematic operation method by the cam to control the intake and exhaust according to the shape of the cam, there is no limit to obtaining an efficient intake and exhaust effect by the predetermined cam.

In other words, the opening and closing method by the cam can be expected to some extent high efficiency in terms of engine output and efficiency, but it is difficult to configure the optimum intake and exhaust system through various tuning because the shape of the cam is basically fixed.

In addition, although the vibration and noise of the engine are greatly influenced by other factors, the noise generated by the friction and shock of the cam is also an important factor of engine noise generation.

In order to solve the problem caused by the cam, a method of adsorbing and opening and closing the intake and exhaust valve by the electromagnet has been proposed. However, the disadvantage of the electronic system is that the electromagnetic response cannot effectively cope with the kinematic movement. As there is a possibility of directly affecting the cylinder head, the reality is that there is a problem in mass production application.

Accordingly, the present invention has been made in view of the above-mentioned points, and its object is

Intake / exhaust valve opening / closing device using exhaust gas as a driving source to reduce the vibration and noise by using exhaust gas pressure without opening and closing the intake / exhaust valve, and to easily adjust the intake / exhaust timing to improve engine performance in response to the operating conditions. To provide.

The present invention to achieve the above object

In the device for opening and closing the intake and exhaust valve,

A branch pipe branched to the exhaust pipe;

An exhaust gas supply pipe for distributing exhaust gas from the branch pipe to the intake and exhaust valve sides of each cylinder;

A cylinder into which exhaust gas is introduced from each of the supply pipes;

A valve actuating piston vertically reciprocating in the cylinder and fixed to an upper end of a valve stem of each intake and exhaust valve;

An atmospheric communication pipe passage through which exhaust gas is introduced from the exhaust gas supply pipe into each cylinder to release air to the atmosphere when the valve operation piston descends;

Supply solenoid valves installed to open and close the respective exhaust gas supply pipes;

An exhaust gas return pipe connecting the exhaust gas supply pipe and the exhaust pipe to return exhaust gas supplied during an upstroke of the intake and exhaust valve;

Return solenoid valves installed to open and close the respective exhaust gas return lines;

A high pressure tank connected to the branch pipe to supply compressed air to the respective cylinders when the engine is started;

A tank opening and closing solenoid valve for opening and closing the high pressure tank;

An electronic controller for controlling operation of all solenoid valves of the apparatus including each of the solenoid valves in accordance with opening and closing times of the intake and exhaust valves; Characterized in that consists of.

1 is a view showing the intake and exhaust valve opening and closing device using the exhaust gas as a drive source according to the present invention

Figure 2 is a view showing the operating state of the cylinder at the time of valve opening

3 is a view showing the operating state of the cylinder when the valve is closed

4 is a control system of the present invention.

※ Explanation of code for main part of drawing

1: Intake and exhaust valve 2: Cylinder head

3: port 4: valve stem

5: Valve operating piston 6: Cylinder (for valve opening and closing)

7: exhaust pipe 8: branch pipe

9: exhaust gas supply pipe 10: exhaust manifold

11: supply solenoid valve 12: exhaust gas return pipe

13: Return solenoid valve 14: high pressure tank

15: opening and closing solenoid valve 16: exhaust gas storage pipe

17,21: solenoid valve 18,22: pressure gauge

19: electronic control device 20: bypass pipeline

23: valve spring

Hereinafter, the configuration of the present invention will be described with reference to the accompanying drawings.

1 is a view showing the intake and exhaust valve opening and closing device using the exhaust gas as a driving source according to the present invention, Figure 2 is a view showing the operating state of the cylinder when the valve is opened, Figure 3 is a view showing the operating state of the cylinder when the valve is closed. to be.

In the drawing, reference numeral 1 denotes a valve (1a is an intake valve, 1b is an exhaust valve), which opens and closes the ports 3, intake ports 3a and exhaust ports 3b of the cylinder head 2 to introduce a mixer into the combustion chamber, It functions to discharge to the outside.

The valve actuating piston 5 is fixed to the upper end of the valve stem 4, and the valve actuating piston 5 reciprocates up and down in the cylinder 6, the intake 6a, the exhaust 6b.

One cylinder 6 (for valve opening and closing) is provided for each of the intake / exhaust valves 1a and 1b, and the exhaust gas supply pipe 9 branched from the branch pipe 8 branched from the exhaust pipe 7 respectively. A part of the exhaust gas which is connected to the exhaust gas discharged through the exhaust manifold 10 flows into each cylinder 6.

Each of the exhaust gas supply pipes 9 is provided with a supply solenoid valve 11 for opening and closing, and each of the exhaust gas return pipes connecting the respective exhaust gas supply pipes 9 and the exhaust pipes 7 to each other. The return solenoid valve 13 which opens and closes (12) is provided.

The high pressure tank 14 is connected to the branch pipe 8, and the high pressure air (compressed air or high pressure exhaust gas) in the high pressure tank 14 is opened at the opening of the solenoid valve 15 for opening and closing the cylinder. It is supplied to the (6) side.

The high pressure tank 14 is connected to the exhaust pipe 7 side through the exhaust gas storage conduit 16, and a solenoid valve 17 and a pressure gauge 18 are provided on the way.

In addition, the solenoid valves 11, 13, 15, and 17 are controlled by the electronic control unit 19 to open and close.

The bypass pipe line 20 is connected to the exhaust pipe 7 from the branch pipe 8, and a solenoid valve 21 for opening and closing is provided in the middle of the bypass pipe line 20. When the detected exhaust gas supply pressure is equal to or greater than the reference value, the solenoid valve 21 is opened to bypass a part of the exhaust gas.

Referring to the operation process according to the invention of such a configuration as follows.

When the engine is started, the electronic controller 19 opens the solenoid valve 15 and the supply solenoid valve 11 in accordance with the opening and closing timing of the valve 1, and accordingly, the high pressure air stored in the high pressure tank 14 That is, the exhaust gas reaches each of the exhaust gas supply pipes 9. For example, the supply solenoid valve 11a is opened to open the intake valve to the cylinder through which the intake stroke proceeds. The exhaust gas stored at high pressure in the high pressure tank 14 flows into the cylinder 6a, and the valve actuating piston 5a is lowered by the exhaust gas pressure so that the valve 1a opens the intake port 3a. Is introduced into the combustion chamber. At this time, when the start is applied, the electronic control unit 19 shuts off the solenoid valve 15, and a part of the exhaust gas discharged through the exhaust manifold 10 is passed through each of the exhaust pipes through the branch pipe 8. (9), the supply solenoid valve 11b is open, for example, if the cylinder of the first cylinder is an exhaust stroke, the supply solenoid valve 11b for operating the exhaust valve 1b of the corresponding cylinder. Is controlled to open operation, and accordingly exhaust gas flows into the cylinder 6b to lower the valve operating piston 5b to open the exhaust valve 1b.

When the exhaust stroke is completed and the intake stroke starts, the electronic controller 19 closes the supply solenoid valve 11b which has been opened for the exhaust stroke of the corresponding cylinder, and controls the return solenoid valve 13b to open to control the exhaust. The gas return pipe 12b is opened.

Accordingly, the exhaust valve 1b rises due to the elastic force of the valve spring 23 to close the exhaust port, and the exhaust gas in the cylinder 6b passes through the corresponding exhaust gas return pipe 12b opened through the exhaust pipe 7. ), And the opening and closing operations of the respective solenoid valves 11 and 12 are controlled so that the opening and closing operation is performed in combination according to the control sequence input to the electronic control device 19.

On the other hand, in order to open and close the valve at the start-up that the exhaust gas is not yet discharged, the exhaust gas stored in the high pressure tank 14 is used in advance. Open and close the solenoid valve 17 to replenish the exhaust gas to a certain pressure in the high pressure tank 14, and then close the solenoid valve 17 to seal the high pressure tank 4, if the pressure is insufficient The compressor may be connected to store compressed air.

When the exhaust gas pressure higher than the reference value is detected from the pressure gauge 22, the electronic controller 19 controls the opening of the solenoid valve 21 to return the exhaust gas so that the exhaust gas of excessive pressure in each cylinder 6 for valve operation. Will block the supply.

As described above, the present invention can control the opening and closing timing of the intake / exhaust valve 1 by the control of the electronic controller 19, so that the valve timing can be determined very effectively.

Here, reference numeral 24 denotes an atmospheric pressure open duct.

According to the present invention as described above to open and close the intake and exhaust valves by the exhaust gas pressure, by controlling the opening and closing of the solenoid valves by the electronic control device is no need for a cam operating mechanism for opening and closing of the intake and exhaust valves, vibration and noise is eliminated It has the effect of ensuring comfortable running, freely adjusting the intake and exhaust timing, effectively increasing the engine performance, and eliminating the camshaft assembly, which is a complex and heavy structure, allows the engine to be lighter in weight and reduces the cost. .

Claims (6)

In the device for opening and closing the intake and exhaust valve, A branch pipe branched to the exhaust pipe; An exhaust gas supply pipe for distributing exhaust gas from the branch pipe to the intake and exhaust valve sides of each cylinder; A cylinder into which exhaust gas is introduced from each of the supply pipes; A valve actuating piston vertically reciprocating in the cylinder and fixed to an upper end of a valve stem of each intake and exhaust valve; An atmospheric communication pipe passage through which exhaust gas is introduced from the exhaust gas supply pipe into each cylinder to release air to the atmosphere when the valve operation piston descends; Supply solenoid valves installed to open and close the respective exhaust gas supply pipes; An exhaust gas return pipe connecting the exhaust gas supply pipe and the exhaust pipe to return exhaust gas supplied during an upstroke of the intake and exhaust valve; Return solenoid valves installed to open and close the respective exhaust gas return lines; A high pressure tank connected to the branch pipe to supply compressed air to the respective cylinders when the engine is started; A tank opening and closing solenoid valve for opening and closing the high pressure tank; An electronic controller for controlling operation of all solenoid valves of the apparatus including each of the solenoid valves in accordance with opening and closing times of the intake and exhaust valves; Intake and exhaust valve opening and closing device using an exhaust gas as a drive source, characterized in that consisting of. The method of claim 1, The high pressure tank is connected to the exhaust pipe through the exhaust gas storage conduit to fill the exhaust gas, the solenoid valve for closing the high pressure tank by opening and closing the exhaust gas storage conduit is characterized in that the exhaust gas Intake / exhaust valve opening and closing device used as a driving source. The method of claim 2, Intake and exhaust valve opening and closing device using the exhaust gas as a drive source, characterized in that the opening and closing operation of the starting valve of the engine is a high-pressure exhaust gas stored in the high pressure tank. The method of claim 1, And an exhaust gas return pipe for returning a part of the exhaust gas to the exhaust pipe when the exhaust gas pressure supplied to the branch pipe is a predetermined value or more. The method of claim 4, wherein And a solenoid valve for opening and closing the exhaust gas return line. The method of claim 5, An intake and exhaust valve opening and closing device using exhaust gas as a driving source, characterized in that a pressure gauge for measuring the exhaust gas pressure of the branch pipe is provided.