KR20050044119A - Exhaust brake system for vehicle - Google Patents

Abstract

An exhaust brake system according to an embodiment of the present invention includes an exhaust valve, an exhaust valve drive unit, and a check valve. An exhaust valve is provided in the exhaust port to selectively open or close the exhaust port. The exhaust valve drive unit drives the exhaust valve. The check valve is configured to be opened or closed in response to the pressure of the exhaust port, and is disposed between the exhaust port and the intake port to allow the exhaust gas of the exhaust port to flow into the intake port when opened. By injecting the high pressure exhaust gas of the exhaust port into the intake port, the pressure in the combustion chamber is increased. Therefore, the braking force of the exhaust brake is greatly improved.

Description

Exhaust brake system of vehicle {EXHAUST BRAKE SYSTEM FOR VEHICLE}

The present invention relates to an exhaust brake system of a vehicle.

An exhaust brake is an auxiliary brake of a vehicle, and is an apparatus for improving braking force by an engine by preventing exhaust gas of an engine from being discharged to the outside by using an exhaust valve installed in an exhaust port. .

Such an exhaust brake system can be realized by a valve installed in the exhaust port and an actuator for driving the valve, and thus has an advantage that the structure is simple and the installation cost is very low compared to other brake devices.

However, the conventional exhaust brake system including an exhaust valve installed in the exhaust port does not provide sufficient braking force.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to provide an exhaust brake system in which brake performance is greatly improved by providing a check valve capable of moving exhaust gas from an exhaust port to an intake port. have.

An exhaust brake system according to an embodiment of the present invention for achieving the above object includes an exhaust valve, an exhaust valve drive unit, and a check valve. An exhaust valve is provided in the exhaust port to selectively open or close the exhaust port. The exhaust valve drive unit drives the exhaust valve. The check valve is configured to be opened or closed in response to the pressure of the exhaust port, and is disposed between the exhaust port and the intake port to allow the exhaust gas of the exhaust port to flow into the intake port when opened.

When the pressure of the exhaust port is higher than the set pressure by closing the exhaust port by the exhaust valve, the check valve is preferably configured to open.

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

As shown in FIG. 1, an exhaust brake system 10 according to an embodiment of the present invention may include an exhaust port 11 to selectively open or close an exhaust port 11. A check valve disposed between the exhaust valve 13, the drive unit 15 for driving the exhaust valve 13, and the exhaust port 11 and the intake port 17. 19).

The exhaust valve 13 is rotatably installed in the exhaust port 11.

In response to the rotation of the exhaust valve 13, the exhaust port 11 is opened or closed.

That is, the exhaust port 11 is closed when the exhaust valve 13 is located at the point corresponding to the solid line in the drawing, and the exhaust port 11 is opened when the exhaust valve 13 is located at the point corresponding to the dotted line in the drawing. Will be.

When the exhaust port 11 is opened, the engine is operating normally, and the exhaust brake does not operate.

On the other hand, when the exhaust port 11 is closed, the exhaust gas of the engine is blocked. As a result, the engine is actuated by the brakes.

The drive unit 15 includes an actuator 21 for rotating the exhaust valve 13 and a switch 23 for receiving an exhaust brake operation signal from a driver.

The actuator 21 can be any actuator, such as a pneumatic actuator, a hydraulic actuator, and an electric actuator.

The switch 23 is preferably installed near the driver's seat so that the driver can easily operate the switch. When the driver operates the switch 23, the actuator 21 is operated so that the exhaust valve 13 blocks the exhaust port 11.

The check valve 19 is disposed between the exhaust port 11 and the intake port 17. The check valve 19 is configured to move the exhaust gas in the exhaust port 11 to the intake port 17.

That is, when the check valve 19 is opened, the exhaust gas in the exhaust port 11 moves to the intake port 17 through the check valve 19.

As shown in the figure, the check valve 19 is provided in a dividing wall 25 that divides the intake port 17 and the exhaust port 11, so that the exhaust gas in the exhaust port 11 is intake port. (17) can be moved into.

At this time, the check valve 19 is preferably configured to open when the pressure in the exhaust port 11 is higher than the set pressure.

For example, when the pressure in the exhaust port 11 is higher than any value between 3 bar and 5 bar, the check valve 19 is preferably configured to open.

In the exhaust brake system 10 according to the embodiment of the present invention, when the exhaust port 11 is blocked by the exhaust valve 13, the pressure in the exhaust port 11 increases, and as a result, the check valve 19 Is opened. When the check valve 19 is opened, the high pressure exhaust gas in the exhaust port 11 flows into the intake port 17.

The high pressure exhaust gas introduced into the intake port 17 is introduced into the combustion chamber 27 of the engine at the intake stroke.

Therefore, the high pressure gas flows into the combustion chamber 27 of an engine, and the pressure of the combustion chamber 27 will raise significantly. As a result, the braking force of the exhaust brake is greatly improved.

In the above, preferred embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and easily changed by those skilled in the art to which the present invention pertains. It includes all changes and / or modifications to the extent deemed acceptable.

According to the embodiment of the present invention, when the exhaust brake operates, the high pressure exhaust gas of the exhaust port flows into the intake port and the exhaust gas flows back into the combustion chamber, thereby increasing the pressure inside the combustion chamber. As a result, the braking force of the exhaust brake is greatly improved.

1 is a schematic view showing an exhaust brake system according to an embodiment of the present invention.

Claims (2)

An exhaust valve installed at the exhaust port to selectively open or close the exhaust port; An exhaust valve driving unit for driving the exhaust valve; And A check valve disposed between the exhaust port and the intake port so that the exhaust gas of the exhaust port can be introduced into the intake port when the exhaust port is opened or blocked according to the pressure of the exhaust port; Exhaust brake system comprising a. In claim 1, And the check valve is configured to open when the pressure of the exhaust port is higher than the set pressure by the closing of the exhaust port by the exhaust valve.