JPH06248992A - Control device for exhaust brake - Google Patents

Abstract

PURPOSE:To improve the safety of running by providing a means to release the operation state of an exhaust brake according to a detected output from a slip state detecting circuit to detect that a wheel slip occurs. CONSTITUTION:A driving relay 3 is provided for automatically setting an exhaust brake 2 to a working state according to an alarm output from an intercar distance alarming device 1. A delay means to delay operation of the driving relay 3 until an alarm output is continued for a given time is contained in the position 29 of an interface circuit to the drive relay 3 of the intercar distance alarming device 1. A slip state detecting circuit 4b to detect it by means of an output from a rotation sensor that a slip occurs to a wheel is arranged in an automatic brake control device (ABS) 4 containing a program control circuit 4a. A release relay 6 to release operation of an exhaust brake 2 according to a detected output from the detecting circuit 4b is provided. This constitution causes improvement of the safety of running.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an automobile equipped with an internal combustion engine. TECHNICAL FIELD The present invention relates to control of an exhaust brake device in which an opening / closing valve is provided in an exhaust passage of an internal combustion engine and a vehicle is braked by closing a part of the exhaust passage.

[0002]

2. Description of the Related Art An electromagnetic wave or an ultrasonic wave which is pulse-modulated in the traveling direction of a vehicle is transmitted, and the electromagnetic wave or the ultrasonic wave receives a reflected wave reflected by an obstacle in front of the vehicle. The vehicle-to-vehicle distance warning device has come to be widely used to detect the distance to the obstacle by the time of, and as a function of the detected distance and the traveling speed of the vehicle, warn of an abnormal approach of the vehicle to the obstacle. It was

In the conventional apparatus, the warning output of the inter-vehicle distance warning apparatus is generally a sound display such as a buzzer sound, a chime sound or a recorded or synthesized voice, and an optical display such as lighting of a warning lamp. .

When the driver becomes accustomed to the warning by the acoustic display or the optical display, the reaction of the driver may be slow even if the warning is given.

[0005]

The applicant of the present invention has separately filed a patent application for an invention for automatically operating an exhaust brake by an alarm output of an inter-vehicle distance warning device to reduce the speed of the vehicle to improve safety. did.

In addition to the above invention, it is an object of the present invention to provide a device for automatically releasing an automatically operated exhaust brake to further improve safety.

[0007]

The first aspect of the present invention is to provide means for automatically setting an exhaust brake to an operating state in accordance with an alarm output of an inter-vehicle distance warning device, and a slip for detecting a wheel slip. Means for releasing the operating state of the exhaust brake according to the detection output of the state detection circuit. The slip state detection circuit may be a part of an automatic brake control device (ABS).

A second aspect of the present invention is to detect a plurality of rotation sensors provided on a plurality of wheels and a slip state detection circuit for detecting that the rotations detected by the plurality of rotation sensors are inconsistent over a predetermined range. And an exhaust brake, the automatic brake is provided with means for automatically setting the exhaust brake to a released state when the slip state detection circuit has a detection output.

[0009]

The alarm output of the inter-vehicle distance warning device becomes a control signal for the exhaust brake, and the exhaust brake is set to the operating state regardless of the driver's operation, and the speed of the vehicle is automatically reduced.

When the warning output of the inter-vehicle distance warning device is sent out for an extremely short time due to some reason, it may not be appropriate to set the exhaust brake to the operating state each time, and the predetermined time (0.5 to 2 seconds) is set. It is possible to set the exhaust brake to the operating state only when the alarm output is continuously sent out for a certain period of time), and in that case, setting and release are not repeated unnecessarily, The operation sound is also quiet.

When the warning output of the inter-vehicle distance warning device is sent out stepwise according to the degree of danger, the device of the present invention can be adapted to respond to the warning output of a predetermined step or higher.

In this device, when the exhaust brake is automatically set to the operating state, the release is performed by depressing the accelerator pedal, automatically in conjunction with other operations, or by the driver's release operation. However, in the present invention, when the slip state of the wheel is detected by the automatic brake control device (ABS), the operating state of the exhaust brake can be automatically released to improve the traveling safety.

Separately from the present invention, a patent application has been filed by the same applicant as the present invention for a device that automatically applies mechanical vibration to the accelerator pedal when the output of the inter-vehicle distance warning device is sent. Generally, the exhaust brake is configured so that its operation is prohibited while the driver depresses the accelerator pedal, so it is necessary to release the accelerator pedal when the output of the inter-vehicle distance warning device is sent. And
The device of the present invention is usefully implemented with a device that imparts vibration to its accelerator pedal.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG.
FIG. 3 is a diagram showing a configuration example of a delay means in the embodiment of the present invention.

The embodiment of the present invention is provided with a drive relay 3 for automatically setting the exhaust brake 2 to an operating state in response to an alarm output of the inter-vehicle distance warning device 1, and an interface to the drive relay 3 of the inter-vehicle distance warning device 1. The position 29 of the circuit includes a delay unit that delays the operation of the drive relay 3 until the alarm output continues for a predetermined time, and further, a rotation sensor provided in the automatic brake control device (ABS) 4 including the program control circuit 4a. A release relay 6 is provided for releasing the operating state of the exhaust brake 2 in accordance with the detection output of the slip state detection circuit 4b that detects the presence of a wheel slip based on the output from 5. The release relay 6 is normally closed.

The exhaust brake 2 has a butterfly valve 8 for opening and closing an exhaust gas passage in an exhaust pipe 7, a control cylinder 9 for operating the butterfly valve 8, and an air tank electrically connected to the drive relay 3 and connected to the control cylinder 9. A solenoid valve 11 for supplying the air in 10 is provided.

Between the power source 21 and the release relay 6, there are a clutch switch 22 which is turned on when the clutch is connected and an accelerator switch 23 which is turned on when the accelerator pedal is not depressed. Is connected in series, and the inter-vehicle distance warning device 1 is connected with an alarm device 24 for issuing an alarm when an alarm output is received, and on / off for manually opening / closing the warning output from the inter-vehicle distance warning device 1 A switch 25 is connected, and the on / off switch 25 is connected to an exciting coil 26a of a relay circuit 26 arranged between the power source 21 and the drive relay 3.

Further, between the release relay 6 and the solenoid valve 11, a manually operated exhaust brake switch 27 and an indicator light 28 indicating that the exhaust brake state is set.
And the output of the slip state detection circuit 4b are connected to the exciting coil 6a of the release relay 6 and the drive relay 3
The exciting coil 3a is connected to the contact of the relay circuit 26.

Next, the operation of the embodiment of the present invention thus constructed will be described.

When the on-off switch 25 is in the ON state and the inter-vehicle distance warning device 1 detects an abnormal approach to an obstacle and sends out a warning output, the warning device 24 gives a warning and the relay circuit 26 is excited. The coil 26a is excited. Due to this excitation, the contact 26b is closed and the power source 2
A current is supplied from 1 to the exciting coil 3a of the drive relay 3 to close the contact 3b.

On the other hand, when an inter-vehicle distance alarm is issued, the driver releases the accelerator pedal in an attempt to decelerate the clutch without blocking the clutch, so that the clutch switch 22 and the accelerator switch 23 are turned on and the power source 21 is turned on.
Contact 6b of the release relay 6 in which the current from the normally closed state
Is supplied to the solenoid valve 11 via the contact 3b of the drive relay 3. As a result, the solenoid valve 11 operates to open the air passage, supply the air accumulated in the air tank 10 to the control cylinder 9, and close the butterfly valve 8 provided in the exhaust pipe 7.

By such an operation, the exhaust brake 2 is automatically set to the operating state in accordance with the alarm output of the inter-vehicle distance warning device 1. In this state, the exhaust brake 2 is provided in the automatic brake control device (ABS) 4. Slip state detection circuit 4
When b detects that there is a slip on the wheel based on the output from the rotation sensor 5 of each wheel, a current is supplied to the exciting coil 6a of the release relay 6 to open the contact 6b. Contact 6
When b is opened, the current supply from the power source 21 to the solenoid valve 11 is stopped, and the solenoid valve 11 shuts off the air supply path from the air tank 10 to the control cylinder 9.
As a result, the control cylinder 9 returns to the original position, the butterfly valve 8 is opened, and the operation of the exhaust brake 2 is stopped.

It should be noted that the exhaust brake 2 can be selected by the driver.
If it is desired to stop the operation of the above, the exhaust brake 2 is not operated by opening the on / off switch 25. The exhaust brake switch 27 is a switch operated by the driver when using the exhaust brake regardless of the inter-vehicle distance warning.

The delay means shown in FIG. 2 can be inserted at the position 29 in FIG. The time constant of the delay means is set to, for example, 0.5 to 2 seconds, and the inter-vehicle distance warning device 1 sends out an alarm output, and the coil 26a of the relay circuit 26 is not activated until it continues for a time exceeding the time constant. Energize. That is, when the alarm output disappears in a very short time, the exhaust brake does not operate each time.

[0025]

As described above, according to the present invention, when the warning output of the inter-vehicle distance warning device is sent, the exhaust brake is automatically set to the operating state and the vehicle is decelerated. In addition, when the exhaust brake is in the operating state and the slip state of the wheel is detected, the operating state of the exhaust brake can be automatically released to improve the traveling safety.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of a delay unit in the embodiment of the present invention.

[Explanation of symbols]

 1 inter-vehicle distance alarm device 2 exhaust brake 3 drive relays 3a, 6a, 26a excitation coils 3b, 6b, 26b contacts 4 automatic brake control device (ABS) 4a program control circuit 4b slip state detection circuit 5 rotation sensor 6 release relay 7 exhaust pipe 8 Butterfly valve 9 Control cylinder 10 Air tank 11 Solenoid valve 21 Power supply 22 Clutch switch 23 Accelerator switch 24 Alarm device 25 On / off switch 26 Relay circuit 27 Exhaust brake switch 28 Indicator light 29 Position to insert delay means

Claims (3)

[Claims] 1. A means for automatically setting an exhaust brake to an operating state in response to an alarm output of an inter-vehicle distance alarm device, and the exhaust gas according to a detection output of a slip state detection circuit for detecting a slip of a wheel. A control device for an exhaust brake, comprising: means for releasing an operating state of the brake. 2. The exhaust brake control device according to claim 1, wherein the slip state detection circuit is a partial circuit of an automatic brake control device (ABS). 3. A plurality of rotation sensors provided on each of a plurality of wheels, a slip state detection circuit for detecting that the rotations detected by the plurality of rotation sensors are inconsistent over a predetermined range, and an exhaust brake. A vehicle including: a vehicle including means for automatically setting the exhaust brake to a released state when the slip state detection circuit has a detection output.