KR200197213Y1 - Safety device of vehicle exhaust brake - Google Patents

Abstract

The present invention detects when air pressure leaks from an exhaust brake installed in a large bus or truck, operates the exhaust brake, and blocks the throttle body to block the inflow of air, thereby preventing a safety accident. The safety device of the exhaust brake is an air pressure sensor (54) which detects the air pressure in the air tank (18) and sends it to the ECU (20), and opens the air based on a signal transmitted from the ECU (20). The second three-way valve 50 for releasing the compressed air sent from the tank 18 to the atmosphere, and the second disk valve which is openably mounted to the exhaust pipe 2 at a position adjacent to the first disk valve 4. And a second piston 32 connected to the second rod 36 by a second spring 38 by operating the second disc valve 34 via the rod 36. Became A third three-way valve 52 which opens on the basis of a second air cylinder 30, a signal transmitted from the ECU 20, and releases compressed air sent from the air tank 18 to the atmosphere, and a throttle valve By operating the third disk valve 44 mounted on the throttle body 50 in a position adjacent to the 54 to open and close and the rod 46, the third disk valve 44 is operated. It consists of the 3rd air cylinder 40 with which the 3rd piston 42 connected with the 3rd rod 46 by the 3 spring 48 is provided.

Description

Safety device of vehicle exhaust brake

The present invention relates to a safety device for a vehicle exhaust brake, and more particularly, when the air pressure leaks from an exhaust brake installed in a large bus or a truck, the exhaust brake is activated and the throttle body is blocked to detect air pressure. The present invention relates to a safety device for a vehicle exhaust brake capable of preventing a safety accident by blocking inflow.

The brakes used for braking in automobiles can be divided into main brake wheel brakes used for slowing down or temporarily stopping while driving, and parking brakes used for long time parking. It can be divided into drum type and disc type brake according to the form of friction.

Moreover, instead of the brake which obtains a braking force by a frictional force, the deceleration brake which can obtain an auxiliary braking force using a separate mechanism is used for a vehicle. The deceleration brake converts the braking energy into thermal energy without friction and obtains a braking force. The deceleration brake acts as a brake when descending a long hill to reduce the load of the main brake. The deceleration brake which plays such a role includes an exhaust brake, an eddy current deceleration brake, an air resistance deceleration brake, and the like.

Among these, the exhaust brake has a structure as shown in Fig. 1, which closes the exhaust pipe and stops the supply of fuel to obtain the engine brake effect as much as possible.

1 is a configuration diagram showing a conventional exhaust brake. In view of the overall configuration, the disk valve 4 is rotated via the rod 6 in a state in which the disk valve 4 is mounted on the exhaust pipe 2 so as to be openable and closed by the spring 8. It consists of an air cylinder (10) in which the piston (12) is built, and a three-way valve (14) which is opened according to the operation of the brake switch (16) and supplies air from the air tank (18) to the air cylinder (10). have.

In normal operation, the disc valve 4 is kept open as shown by the virtual line. Therefore, the exhaust gas discharged from the combustion chamber in accordance with the opening of the exhaust valve is discharged toward the silencer through the exhaust pipe.

Next, when the driver operates the brake switch 16, the three-way valve 14 is opened and the air in the air tank 18 starts to be supplied to the air cylinder 10. The compressed air supplied to the air cylinder 10 causes the piston 12 to rotate the disc valve 4 as shown by the solid line by pushing the rod 6 while moving forward with the force of the spring 8 to advance the exhaust pipe ( 2) to prevent Accordingly, the combustion gas discharged from the combustion chamber is not discharged to the outside, but revolves around the combustion chamber. At this time, since the air does not flow into the intake port by the pressure in the combustion chamber, the engine brake effect is generated due to the impossibility of combustion, and thus the auxiliary braking force. You get

In the conventional vehicle exhaust brake having such a configuration, the brake operation is impossible when the air pressure is lowered due to the leakage of compressed air, and there is a risk of causing a large accident. In particular, when the driver is not aware of the lack of air pressure, there is a problem of causing a collision with another vehicle.

The present invention devised to solve these problems measures the air pressure stored in the air tank and sends it to the electronic control unit (hereinafter referred to as ECU), while the ECU is a pressure when the pressure in the tank is below the specified value In addition to operating a separate auxiliary disk valve installed in the exhaust pipe, and also sends a signal to the disk valve installed in the throttle valve to block the intake air, to provide a safety device of the vehicle exhaust brake that can obtain the auxiliary braking force The purpose is.

1 is a block diagram showing a conventional vehicle exhaust brake,

Figure 2 is a block diagram showing a vehicle exhaust brake of the present invention.

♣ Explanation of symbols for main part of drawing ♣

2: exhaust pipe 4, 34, 44: 1st to 3rd disc valve

6, 36, 46: first to third rods 8, 38, 48: first to third springs

10, 30, 40: 1st to 3rd air cylinders 12, 32, 42: 1st to 3rd pistons

14, 50, 52: 1 to 3 three-way valve 16: brake switch

18: Air tank 20: ECU

22: vehicle speed sensor 24: battery

26: warning lamp 54: air pressure sensor

An object of the present invention described above is a first air cylinder having a first disc valve for opening and closing an exhaust pipe and a first piston for rotating the first disc valve via a first rod in a compressed state by a first spring. And a vehicle exhaust brake having a first three-way valve which is opened in response to the operation of the brake switch to supply air from the air tank to the first air cylinder, the air pressure sensor detecting and sending the air pressure in the air tank to the ECU; A second three-way valve that is opened based on a signal transmitted from and discharges compressed air sent from the air tank to the atmosphere, and a second disk valve which is mounted to the exhaust pipe at a position adjacent to the first disk valve; By operating the second disc valve via the rod, there is a second piston connected to the second rod by the second spring inside A second air cylinder installed, a third three-way valve which is opened based on a signal transmitted from the ECU and releases compressed air sent from the air tank to the atmosphere, and the throttle body can be opened and closed at a position adjacent to the throttle valve. A third disc valve mounted therein, and a third disc valve operated via the rod, wherein the third disc includes a third air cylinder having a third piston connected to the third rod by a third spring. It is achieved by the safety device of the vehicle exhaust brake.

Hereinafter, a safety device for a vehicle exhaust brake according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. (The same components as those of the conventional structure described with reference to FIG. 1 are denoted by the same reference numerals.)

Figure 2 is a block diagram showing an exhaust brake for a vehicle of the present invention. In the case where the air pressure in the air tank 18 is low due to the leakage of air pressure, an additional braking force is obtained by operating a separate exhaust brake, while closing the throttle body to block intake air to lower the engine output. In the present invention, an auxiliary brake was installed separately from the existing exhaust brake in the exhaust pipe, and an auxiliary throttle valve was installed in the throttle body 50 to block external air. In addition, by installing a warning light 26 to alert the driver when the air pressure is lowered to prevent a large accident.

As described in FIG. 1, a vehicle exhaust brake includes a first disc valve 4 for opening and closing an exhaust pipe 2 and a first rod 6 through a first rod 6 in a compressed state by the first spring 8. The first air cylinder 10 having the first piston 12 for rotating the disc valve 4 and the brake switch 16 are opened to open the air of the air tank 18 to the first air cylinder. It consists of the 1st three-way valve 14 supplied to (10).

In addition, the throttle body 50 is provided with a conventional throttle valve 54 for opening the throttle body 50 by the operating force of the accelerator pedal 52 transmitted through the acceleration cable.

In the exhaust brake having such a configuration, in view of the schematic configuration of the safety device of the exhaust brake according to the present invention for operating the exhaust brake when the air pressure decreases, the second disc valve 34 which is installed to be opened and closed to the exhaust pipe 2 is provided. And a third air cylinder 30 for operating the second disc valve 34, a third disc valve 44 mounted on the throttle body 50 so as to be openable and close, and the third disc valve 44. It consists of a third air cylinder 40 to operate.

The air tank 18 is provided with an air pressure sensor 54 which detects the air pressure and sends it to the ECU 20. The ECU 20 has a second three-way valve 50 when the air pressure is equal to or less than a specified value based on this signal. ) And a third battery (24) to the three-way valve 52 to send electricity to operate the compressed air to be released into the atmosphere.

The second three-way valve 50 and the third three-way valve 52 are opened according to control signals of the ECU 20, respectively, and serve to discharge compressed air into the atmosphere. The second piston 32 is mounted in the second air cylinder 30 in a state of being pressed by the second spring 38. The second rod 36 is connected to the second piston 32, and the second disc valve 34 is operatively coupled to the end of the second rod 36. In addition, the third piston 42 is mounted in the third air cylinder 40 in a state of being pressed by the third spring 48. A third rod 46 is connected to the third piston 42, and a third disk valve 44 is operatively coupled to the end of the third rod 46.

Here, the second disk valve 34 serves to block the flow of the exhaust gas while opening and closing the exhaust pipe 2, the third disk valve 44 opens and closes the throttle body 50, the air introduced from the outside Blocks the inflow of the engine to reduce the output.

The following describes the operation of the safety mechanism of the exhaust brake having such a configuration.

The ECU 20 supplies the second three-way valve 50 and the third three-way valve 52 when the pressure in the air tank 18 is lower than or equal to a predetermined value based on the signal transmitted from the air pressure sensor 54. Send a signal

Since the second three-way valve 50 is opened based on the signal transmitted from the ECU 20 to discharge the compressed air sent from the air tank 18 to the atmosphere, the second three-way valve 50 is disposed adjacent to the first air cylinder 10. Compressed air is no longer supplied to the second air cylinder 30, and the second piston 32 in the second air cylinder 30 is pressed by the force of the second spring 38. As the second rod 36 is pushed by the pressure of the second piston 32, the second disc valve 34 in a position adjacent to the first disc valve 4 is closed as shown by an imaginary line and the exhaust pipe ( 2) will be closed.

At the same time, since the third three-way valve 52 is opened based on the signal transmitted from the ECU 20 and discharges compressed air sent from the air tank 18 to the atmosphere, the third air cylinder 40 Compressed air is no longer supplied, and the third piston 42 in the third air cylinder 40 is pressurized by the force of the third spring 48. As the third rod 46 is pushed by the third piston 42 and the third disc valve 44 is closed as shown in the phantom, the throttle body 50 is closed to block the inflow of external air. Done.

With the operation of the second disc valve 34 and the third disc valve 44, the ECU 20 also sends a signal to the warning light 26 to light it up to alert the driver.

According to the present invention described above, when the pressure in the tank is lower than the specified value based on the signal transmitted from the air pressure sensor, the ECU operates a separate auxiliary disk valve installed in the exhaust pipe, and is installed in the throttle valve. By blocking the air sucked by sending a signal to the disk valve, the auxiliary braking force can be obtained, there is an advantage that can prevent a large accident by warning the driver by turning on the warning light.

Claims (2)

A first disc valve 4 for opening and closing the exhaust pipe 2 and a first disc pivoting the first disc valve 4 via the first rod 6 in a compressed state by the first spring 8. The first air cylinder 10 in which the piston 12 is built in, and the first three, which are opened according to the operation of the brake switch 16, supply air from the air tank 18 to the first air cylinder 10. In a vehicle exhaust brake with a way valve 14, An air pressure sensor 54 which detects the air pressure in the air tank 18 and sends it to the ECU 20; A second three-way valve 50 that is opened based on a signal transmitted from the ECU 20 and releases compressed air sent from the air tank 18 to the atmosphere; A second disc valve 34 mounted to the exhaust pipe 2 so as to be openable and close to the first disc valve 4; The second disk valve 34 is operated via the second rod 36, and the second piston 32 connected to the second rod 36 by the second spring 38 is installed therein. The second air cylinder 30, A third three-way valve 52 which is opened based on the signal transmitted from the ECU 20 and releases compressed air sent from the air tank 18 to the atmosphere; A third disc valve 44 mounted to the throttle body 50 so as to be openable and close to the throttle valve 54; The third disc valve 44 is operated via a third rod 46, and a third piston 42 connected to the third rod 46 by a third spring 48 is installed therein. Safety device for a vehicle exhaust brake, characterized in that it comprises a third air cylinder (40). The method of claim 1, Safety device for a vehicle exhaust brake, characterized in that further provided with a warning light (26) that lights up in accordance with the signal transmitted from the ECU (20) to alert the driver.