JP2541864B2 - Traction control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction control device for an automobile, and more particularly to a traction control device for preventing wheel slip during acceleration.

[Outline of Invention]

A traction control device used in combination with an anti-lock brake system, in which a diff brake control valve is connected to the air supply line to the brake chamber, and if the drive wheels slip, the diff brake control valve In the traction control device that supplies compressed air to the brake chamber to brake the drive wheels and suppresses the amount of fuel supplied to the engine to prevent wheel slippage, the differential brake control valve and the brake chamber are connected to each other. The connecting air line is provided with an outlet having a throttle, and when the differential brake control valve leaks air, the air is exhausted through the outlet having the throttle, thereby preventing the drag of the brake. Yo It is obtained by the.

[Conventional technology]

When a vehicle is accelerated on a road surface such as an icy road or a snowy road where the friction coefficient of the road is small and slippery, the wheels may slip and the vehicle may shake laterally, which may make the driving operation difficult. In order to prevent such a situation, the vehicle is provided with a traction control device.
The traction control device is a device that, when a wheel slips, suppresses the fuel supply amount to reduce the engine speed, and applies a braking force to the wheel to prevent the wheel from slipping. By appropriately operating such a device, it becomes possible to prevent the wheels from slipping during acceleration and avoid the sideslip of the vehicle.

[Problems to be solved by the invention]

The differential brake control valve is used in combination with the anti-lock brake system to form a traction control device. With such a configuration, the differential lock device and the limited slip differential can be omitted. That is, by connecting the differential brake control valve to the air supply line from the relay valve to the brake chamber and supplying compressed air to the brake chamber through the differential brake control valve during slip, the wheels can be braked during slip. It will be possible. However, according to such a configuration, when the differential brake control valve causes air leakage, pressure is applied to the brake chamber, and the vehicle runs while dragging the brake.

The present invention has been made in view of such a problem, and in a device in which the braking means of the traction control device is composed of a differential brake control valve, even if the differential brake control valve causes air leakage. It is an object of the present invention to provide a device that prevents the brake from being dragged.

[Means for solving problems]

The present invention connects a differential brake control valve to a supply line of compressed air to the left and right brake chambers for operating the brakes of the left and right drive wheels, respectively,
A control means for controlling the amount of fuel supplied to the engine is provided, and when the drive wheels slip during acceleration of the vehicle, compressed air is supplied to the brake chamber through the differential brake control valve and is supplied to the engine by the control means. In the device configured to suppress the supply amount of the fuel to be supplied, an exhaust port having a throttle is provided in an air pipe line that connects the differential brake control valve and the brake chamber.

[Operation] Therefore, when the differential brake control valve causes an air leak in a normal running state in which the wheels do not slip, the leaked air is discharged through the exhaust port having the throttle, and the air is discharged to the brake chamber. It is possible to suppress the supply of air.

〔Example〕

The drawings show a traction control device according to an embodiment of the present invention, which is adapted to be used in combination with an antilock brake system. The brakes on the front wheels 11 and the rear wheels 12 are activated by brake chambers 13 and 14, respectively. These brake chambers
Compressed air is supplied from an air tank 19 to 13 and 14 through relay valves 17 and 18 connected to air pipelines 15 and 16.

A brake valve 23 having a brake pedal 22 is provided for actuating the relay valves 17, 18. The brake valve 23 is connected to the air tank 19 via an air line 24 and a relay valve via signal pipes 25 and 26.
It is designed to be connected to 17, 18. A load sensing valve 27 is connected between the relay valve 18 on the rear wheel side and the brake valve 23, and the air pressure is controlled according to the load applied to the vehicle so that the braking force on the rear wheel is adjusted. I have to.

An ABS (anti-lock brake system) control valve 31 is connected to an air pipe 15 that connects the brake chamber 13 of the front wheel 11 and the relay valve 17. Similarly, an ABS control valve 32 is connected to an air pipe 16 which connects the brake chamber 14 on the rear wheel side and the relay valve 18. The control valves 31, 32 are controlled by the ABS computer 33. Wheel sensors 35 and 36 are connected to the input side of the computer 33. These sensors 35, 36
Detects the slips from the rotational speeds of the front wheel 11 and the rear wheel 12, respectively.

Next, the diff brake control valve 37 that constitutes the traction control device will be described. The brake control valve 37 is connected to the air tank 19 via an air pipe 38 and is also connected to the air pipe 16 by an air pipe 39. A double check valve 40 is connected to the air pipe 39. A discharge port 42 having a throttle 41 is connected to the middle of the air pipe 39.

Further, a fuel injection pump 45 is provided in the diesel engine for driving the drive wheels 12 of this vehicle. The fuel injection pump 45 includes a mechanical governor 46,
The load lever 47 is an engine control cylinder 48.
Is connected to the control lever 49 via. Control lever 49
Is connected to a reversing lever 51 via a wire cable 50. Then, the reversing lever 51 is rotated by the accelerator pedal 52. The engine control cylinder 48 is connected to the fuel control valve 53, and the control valve 53 is connected to the air tank 19 via the air pipe 54.

Next, a normal braking operation of such a braking device will be described. When the driver depresses the brake pedal 22, the brake valve 23 is opened and compressed air is supplied to the air pipes 24, 25, 26.
Is applied as a signal pressure to the front and rear relay valves 17 and 18, respectively. Since the relay valves 17 and 18 are opened by such signal pressure, compressed air is supplied from the air tank 19 to the front and rear brake chambers 13 and 14 through the relay valve 17 and the air pipes 15 and 16. The brake chambers 13 and 14 then actuate the brakes, and the front wheels 11 and the rear wheels 12
And brake respectively.

Next, the operation of the anti-lock brake system combined with the traction control device will be described.
When a strong braking is applied on a slippery road surface, the wheels 11 and 12 sometimes lock due to excessive braking force. The braking force of the locked wheels 11 and 12 is lower than that when braking is applied while rotating. When the front wheels 11 are locked, it becomes difficult to steer the vehicle, and when the rear wheels 12 are locked, the vehicle tends to swing back and forth. Also, in the case of a coupling person, it causes trailer swing and jack knife phenomenon.

In order to eliminate such a problem, the rotation speeds of the front wheels 11 and the rear wheels 12 are constantly detected by the wheel sensors 35 and 36, and the detected outputs are supplied to the ABS (antilock brake system) computer 33 to Computer 33 whether 11 or rear wheel 12 slips
Is trying to judge. And front wheel 11 or rear wheel
Brake chamber 1 if 12 slips
ABS control valve 3 to reduce the air pressure of 3 and 14
It supplies a signal to 1, 32, which causes the relay valve 17, 1
Adjust the air pressure applied from 8 to the brake chambers 13,14. That is, the anti-lock brake device adjusts the brake pressure by adjusting the air pressure applied to the brake chambers 13 and 14 using the ABS control valves 31 and 32 by the computer 33 to prevent the wheels 11 and 12 from being locked. ing.

Next, the operation of the traction control device used in combination with the antilock brake device will be described. The rotation speed of the drive wheels 12 when the accelerator pedal 52 is depressed to accelerate the vehicle is detected by the wheel sensor 36, and the detection output is input to the computer 33. The computer 33 compares the detection outputs of the front wheel sensor 35 and the rear wheel sensor 36,
It determines whether the left and right drive wheels 12 have slipped, and if so, the slipped drive wheels 12
A signal is supplied to the diff brake control valve 37 on the side corresponding to and the valve 37 is opened. Then the air pipe 38,
Air pressure is supplied to the brake chamber 14 through the differential brake control valve 37, the air pipe 39, the double check valve 40, the air pipe 16, and the ABS control valve 32. The brake is operated by the brake chamber 14, and the idling drive wheel 12 is braked.

When the drive wheels 12 slip during acceleration, the fuel supply amount to the engine is limited at the same time. This operation is linked to the detection of slip by the wheel sensor 36, and the computer 33 opens the fuel control valve 53, which supplies compressed air from the air tank 19 to the engine control cylinder 48 through the air line 54 and the control valve 53, This is achieved by contracting the control cylinder 48 connecting the control lever 49 and the load lever 47. When the cylinder 48 contracts, the load lever 47 is rotated to the right in the drawing, which pulls back the control rack of the fuel injection pump 45,
This will reduce the fuel supply. Therefore, when the drive wheels 12 slip, the supply of fuel to the engine is suppressed, whereby the driving force of the engine is reduced and the tire 12 can be prevented from slipping.

If the diff brake control valve 37 that performs traction control leaks air in this way, air pipe 38, control valve 37, air pipe 39, and double check valve from the air tank 19 during normal driving.
Compressed air is supplied to the brake chamber 14 through 40, the air pipe 16, and the control valve 32. This may cause the brakes on the drive wheels 12 to drag.

Therefore, in this vehicle, the air pipe 39 is provided with the exhaust port 42 having the throttle 41, and even if air leaks from the valve 37, the air is exhausted to the outside through the exhaust port 42 having the throttle 41. Since the discharge port 42 has the throttle 41, air is not discharged suddenly,
This does not impair the original function of traction control. Also, in the case of normal normal braking operation, the air is shut off by the double check valve 40,
Air is not discharged through the discharge port 42, and consumption of air in the tank 19 is prevented. If the differential brake control valve 37 is normal,
This shuts off the air, and wasteful consumption of air is likewise prevented.

〔The invention's effect〕

As described above, the present invention is provided with the discharge port having the throttle in the air pipe line that connects the differential brake control valve and the brake chamber. Therefore, even if the diff brake control valve leaks air, air is exhausted through the exhaust port with a throttle, which prevents dragging of the brake and avoids the problem of traveling with the service brake applied. It becomes possible to do.

[Brief description of drawings]

Drawing is a piping diagram showing a traction control device concerning one example of the present invention. The names of the main parts in the drawings are as follows. 12 …… Rear wheel (driving wheel) 14 …… Brake chamber 16 …… Air line 18 …… Relay valve 19 …… Air tank 22 …… Brake pedal 23 …… Brake valve 32 …… ABS control valve 33 …… ABS computer 36 …… Wheel sensor 37 …… Diff brake control valve 39 …… Air piping 40 …… Double check valve 41 …… Throttle 42 …… Discharge port 45 …… Fuel injection pump 46 …… Mechanical governor 47 …… Load lever 48… Engine control cylinder 49 Control lever 50 Wire cable 52 Accelerator pedal 53 Fuel control valve

Claims (1)

(57) [Claims] 1. A diff brake control valve is connected to supply lines of compressed air to the left and right brake chambers for operating the brakes of the left and right drive wheels, respectively.
A control means for controlling the amount of fuel supplied to the engine is provided, and when the drive wheels slip during acceleration of the vehicle, compressed air is supplied to the brake chamber through the differential brake control valve and is supplied to the engine by the control means. In the device for suppressing the supply amount of fuel, a traction control device is provided, in which an air outlet that connects the differential brake control valve and the brake chamber is provided with an outlet having a throttle.