JPH078535U - Exhaust brake device - Google Patents

Abstract

(57) [Summary] [Purpose] To automatically apply the exhaust brake together with the engine brake when the vehicle is going downhill and a large braking function is required even if the manual exhaust brake switch is not closed. . [Construction] A gradient sensor 36 is provided in parallel with the manual exhaust brake switch 32 and is closed when the vehicle hits a downhill. Therefore, when the vehicle goes downhill, the gradient sensor 36 is closed, so when the accelerator pedal 34 is released, the accelerator switch 28 is closed and the battery power source 2
6, the electromagnetic valve 24 is excited through the clutch switch 30, the accelerator switch 28, and the gradient sensor 36,
The air cylinder 22 extends and the exhaust valve 14 closes the exhaust pipe 12. Therefore, the exhaust brake is applied together with the engine brake.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an exhaust brake device that brakes a vehicle by closing the exhaust pipe and increasing the pressure inside the engine.

[0002]

[Prior art]

 This type of exhaust brake device is provided with an exhaust brake valve that opens and closes an exhaust pipe, an actuator that drives this exhaust brake valve, and a drive circuit that electrically drives this actuator. It consists of a series circuit consisting of an accelerator switch that is closed when the accelerator pedal is released, a clutch switch that is closed when the clutch is engaged, and a manual exhaust brake switch.

This exhaust brake device is used by closing a manual exhaust brake switch. When the accelerator pedal is released to decelerate the vehicle, the engine brake is applied, but at the same time, the accelerator switch is closed and the clutch is released. The actuator is driven via the clutch switch and the manual exhaust brake switch which are closed in the engaged state, and the exhaust brake valve is closed to apply the exhaust brake.

[0004]

[Problems to be solved by the device]

 However, in this conventional technique, if the exhaust brake switch of the manual type is forgotten to be closed, the exhaust brake will not work, so even if the accelerator pedal is released, the vehicle will only be braked by the engine brake. There was a drawback that the vehicle could not be braked sufficiently when a large braking function was required, such as when driving.

The object of the present invention is to avoid the above-mentioned drawbacks, and even when the manual exhaust brake switch is not closed, when the vehicle is going downhill and a large braking function is required, the exhaust brake together with the engine brake can be operated. It is to provide an exhaust brake device that is automatically activated.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention comprises an exhaust brake valve that opens and closes an exhaust pipe, an actuator that drives this exhaust brake valve, and a drive circuit that electrically drives this actuator. The drive circuit is connected in parallel to the manual exhaust brake switch in the exhaust brake system, which consists of a series circuit consisting of an accelerator switch that closes when the accelerator pedal is released, a clutch switch that closes when the clutch is engaged, and a manual exhaust brake switch. Another object of the present invention is to provide an exhaust brake device characterized by having a gradient sensor that detects that the vehicle is traveling downhill and is closed.

[0007]

[Action]

 In this way, if a gradient sensor that can be detected when the vehicle is traveling downhill and is closed is connected in parallel with the manual exhaust brake switch, the vehicle will operate even if the manual exhaust brake switch is not closed. When going downhill, the slope sensor works and the state is the same as when the manual exhaust brake switch is closed. Therefore, if you release the accelerator pedal, the engine brake will be applied automatically with the exhaust brake. Can drive the vehicle safely.

[0008]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an exhaust brake device 10 according to the present invention. The exhaust brake device 10 moves in and out of an exhaust pipe 12. An exhaust brake valve 14 that opens and closes the exhaust brake valve 14, an actuator 16 that drives the exhaust brake valve 14, and a drive circuit 18 that electrically drives the actuator 16 are provided.

In the illustrated embodiment, the exhaust brake valve 14 is shown in the form of a slide valve slidably mounted across the exhaust pipe 12, but in the form of a butterfly valve. It may be. The actuator 16 that drives the exhaust valve is arranged between the air cylinder 22 that expands and contracts by the air supplied from the air tank 20 and the electromagnetic cylinder that is arranged between the air tank 20 and the air cylinder 22 to control the air supply. It consists of a valve 24.

The drive circuit 18 is connected to the battery power source 26 so as to excite the electromagnetic coil of the electromagnetic valve 24. The drive circuit 18 is connected to the battery power source 26. The accelerator switch 28, the clutch switch 30, and the manual exhaust brake switch are connected to the battery power source 26. It consists of a series circuit with 32. The accelerator switch 28 is a switch that is open when the accelerator pedal 34 is depressed, but closes when the accelerator pedal 34 is released. The clutch switch 30 is closed when the clutch is engaged. However, the switch is open when the clutch is not engaged.

Further, the manual exhaust brake switch 32 is composed of a lever type switch attached to a driver's seat, for example, a side of a steering column, and when the driver wants to apply the exhaust brake, the lever is manually operated. You can close it with.

Therefore, when the driver closes the manual exhaust brake switch 32 and drives the vehicle, the accelerator switch 28 is opened because the accelerator pedal 34 is stepped on during normal driving, and therefore the exhaust brake is turned on. Does not work When the driver releases the accelerator pedal 34 to decelerate, the accelerator switch 28 is closed, and at this time, the clutch switch 30 is closed, so that the battery power supply 26 is engaged with the clutch switch 30, the accelerator switch 28 and the manual exhaust brake brake. An exciting current flows through the electromagnetic coil of the electromagnetic valve 24 through the switch 32, the piston rod of the air cylinder 22 of the actuator 16 extends, and the exhaust valve 14 closes the exhaust pipe 12. For this reason, the internal pressure of the exhaust system of the engine rises, so that the exhaust brake works together with the engine brake to effectively brake the vehicle.

When the accelerator pedal 28 is depressed to accelerate the engine, the accelerator switch 28 opens, so that the electromagnetic coil of the electromagnetic valve 24 is demagnetized, and the piston rod is contracted by a spring (not shown) in the air cylinder 22 of the actuator 16. Then, the exhaust valve 14 opens. Therefore, the exhaust system of the engine returns to the normal state and the engine is accelerated.

As shown in FIG. 1, the exhaust brake device of the present invention includes a gradient sensor 36 that is connected in parallel to a manual exhaust brake switch 32 and that is closed when it detects that the vehicle is traveling downhill. Have more.

The gradient sensor 36 is, for example, as shown in FIG. 2, a liquid switch 38 which is attached to an appropriate position of the vehicle body and which conducts the bipolar terminals when the vehicle body travels downhill, and the liquid switch 38. Consists of a timer switch 40 that closes after a predetermined period of conduction. The timer switch 40 is set so that the deviation sensor 36 does not work when the vehicle is tilted due to the unevenness of the road surface, but the deviation sensor 36 works when the vehicle is tilted downhill for a predetermined time or longer.

As described above, when the gradient sensor 36, which is closed when detecting that the vehicle is traveling on a downhill, is connected in parallel to the manual exhaust brake switch 32, the driver operates the manual exhaust brake switch 32. Even if the driver forgets to close it, when the vehicle hits a downhill, the gradient sensor 36 operates to bring the same state as when the manual exhaust brake switch 32 is closed. Therefore, when the accelerator pedal 34 is released, the exhaust brake is automatically applied together with the engine brake, so that a large brake works on the downhill to allow the vehicle to travel safely.

Incidentally, when it is desired to use the exhaust brake for decelerating while traveling on a road other than a downhill, it goes without saying that the manual exhaust brake switch 32 needs to be closed.

[0018]

[Effect of device]

 According to the present invention, as described above, since the gradient sensor that detects when the vehicle is traveling downhill and is closed is connected in parallel with the manual exhaust brake switch, the manual exhaust brake switch is forgotten to be closed. However, when the vehicle goes downhill, the gradient sensor works and the condition is the same as when the manual exhaust brake switch is closed. Therefore, when the accelerator pedal is released, the exhaust brake is automatically applied together with the engine brake. Therefore, there is a real benefit that a large brake works on a downhill to drive the vehicle safely.

[Brief description of drawings]

FIG. 1 is a schematic system diagram of an exhaust brake device according to the present invention.

FIG. 2 is a system diagram of a specific example of a gradient sensor used in the present invention.

[Explanation of symbols]

 10 Exhaust Brake Device 12 Exhaust Pipe 14 Exhaust Brake Valve 16 Actuator 18 Drive Circuit 20 Air Tank 22 Air Cylinder 24 Electromagnetic Valve 26 Battery Power Supply 28 Accelerator Switch 30 Clutch Switch 32 Manual Exhaust Brake Switch 34 Accelerator Pedal 36 Gradient Sensor 38 Liquid Switch 40 Timer switch

Claims (1)

[Scope of utility model registration request] 1. An exhaust brake valve that opens and closes an exhaust pipe, an actuator that drives the exhaust brake valve, and a drive circuit that electrically drives the actuator, the drive circuit comprising:
In an exhaust brake device consisting of a series circuit of a clutch switch that is closed when the accelerator pedal is released, a clutch switch that is closed when the clutch is engaged, and a manual exhaust brake switch, the vehicle is connected in parallel with the manual exhaust brake switch and the vehicle descends. An exhaust brake device having a gradient sensor that is closed when a vehicle is traveling on a slope is detected.