JPH0514094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust brake device, and more particularly to an exhaust brake device that improves exhaust brake operation in emergency situations.

[Prior Art] As shown in FIG. 3, a conventional exhaust brake device includes a neutral switch a, a clutch switch b, an accelerator switch c, and a manual exhaust brake switch that can be switched manually to provide operating conditions for the exhaust brake. d are connected in series to form a circuit. Here, neutral switch a is turned on when the gear is not in the neutral position, clutch switch b is turned on when the clutch is in the engaged state, and accelerator switch c is in the open state when the foot is released from the accelerator pedal. is turned on, and the manual exhaust brake switch d is manually operated.
ON-OFF switching is possible.

The exhaust brake device is configured to generate exhaust brake force when all of these switches a to d are turned on. Specifically, when all these switches a to d are turned on, relay e is turned on and electromagnetic solenoid f is turned on.
is excited, and as a result, the butterfly valve is closed and the exhaust brake is activated.

Note that g is a battery and h is an exhaust brake operation confirmation lamp.

[Problems to be Solved by the Invention] Conventionally, if the above-mentioned four switches a to d, that is, the four conditions are not met,
There was a problem where the exhaust brake could not be activated. In particular, when a vehicle suddenly falls into an emergency situation from a normal driving state, prompt action is required, and vehicle braking is particularly important.
In the conventional circuit configuration, the driver takes his/her foot off the accelerator pedal, releases the accelerator pedal, and turns on the accelerator switch c (indicated by (A) in the figure), and also turns on the manual exhaust brake switch d.
It was necessary to switch the exhaust brake to ON, and the vehicle had to run for a considerable distance before the exhaust brake actually started to work.

A second exhaust brake operating switch connected in parallel with the manual exhaust brake switch is operated by a control circuit that outputs a drive signal in response to the vehicle speed being above a set speed and the foot brake pedal being depressed. ``Exhaust brake control device'' (Japanese Patent Application Laid-Open No. 1983-1983) that operates the exhaust brake by
120741) has been proposed. This proposal is
A second exhaust brake operating switch is connected in parallel to the manual exhaust brake switch to eliminate the need for the driver to switch the manual exhaust brake switch. From the viewpoint of achieving the objective, vehicle speed and operation of the foot brake pedal are used as operating conditions for the second exhaust brake operating switch.

However, since an emergency state of the vehicle can occur even when the vehicle is moving at a low speed below the set vehicle speed, it is considered that the above-mentioned problems cannot be satisfactorily solved if the vehicle speed is used as the operating condition. Furthermore, turning the foot brake pedal on and off itself is a normal vehicle stopping operation, and cannot necessarily be used as an indicator of an emergency state of the vehicle, and is therefore unsatisfactory as an operating condition for solving the above problem. it is conceivable that.

[Means for Solving the Problems] The present invention provides a manual exhaust brake switch for activating the exhaust brake, a speed detection means for detecting the accelerator pedal release speed, and a detection means for detecting the operation time from the release of the accelerator pedal to the depression of the foot brake pedal. and a control means that is provided in parallel with the manual exhaust brake switch and operates the exhaust brake in accordance with the detected values of these detection means.

[Function] To describe the function of the present invention, the control means provided in parallel with the manual exhaust brake switch uses the detection means to detect the accelerator pedal opening speed and the operation from the opening of the accelerator pedal to the depression of the foot brake pedal, as an indicator of an emergency situation. A system in which the exhaust brake is operated by the control means, regardless of whether the manual exhaust brake switch is switched, when the opening speed is equal to or higher than the set speed and the operating time is within the set time after inputting the time. It is.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the circuit configuration.

As shown in the figure, a neutral switch 1, a clutch switch 2, an accelerator switch 3, and an exhaust brake activation relay 4, which provide operating conditions for the exhaust brake, are connected in series, with a battery connected to one end and a battery connected to the other end. is connected to an electromagnetic solenoid 5 which is excited by energization to drive the exhaust brake valve and operate the exhaust brake. Further, this electromagnetic solenoid 5 is grounded. Here, the neutral switch 1 is turned ON when the gear is not in the neutral position, and turned OFF when the gear is in the neutral position. The clutch switch 2 is turned ON when the clutch is connected, and turned OFF when the clutch is disconnected. Further, the accelerator switch 3 is turned on when the accelerator pedal is released and is in an open state, and turned off when the accelerator pedal is depressed. these are,
Same as before. Further, the exhaust brake activation relay 4 is connected to a manual exhaust brake switch 6, which will be described later.
It is turned on or turned on by the control output from the control means 7. When all of these switches 1 to 3 and the exhaust brake activation relay 4 are turned on, battery voltage is supplied to the electromagnetic solenoid 5 to activate the exhaust brake.

Further, as shown in the figure, a manual exhaust brake switch 6 is connected via a relay coil 8 between the exhaust brake actuation relay 4 and the clutch switch 2 at the preceding stage thereof. Further, this manual exhaust brake switch 6 is grounded. This manual exhaust brake switch 6 can be manually turned on and off as before.
When the three switches 1 to 3 are turned on, the exhaust brake actuation relay 4 is turned on when the three switches 1 to 3 are turned on.

On the other hand, a control means 7 such as a microcomputer is connected in parallel to the manual exhaust brake switch 6 between the manual exhaust brake switch 6 and the relay coil 8, and the control means 7 has a control means 7 for controlling the same. A speed detecting means 9 and a time detecting means 10 that output a detected value are connected.

The purpose of the present invention is to achieve operation of the exhaust brake that can cope with emergency situations of the vehicle, and here, as an index representing the emergency state of the vehicle, the opening speed V of the accelerator pedal and the speed from the release of the accelerator pedal to the depression of the foot brake pedal are used. The operation time T is adopted. This corresponds to the operation in which the driver instantly releases the accelerator pedal and quickly depresses the foot brake pedal when the vehicle is in an emergency situation. It can be recognized by detecting whether the speed V is fast or slow and whether the operation time T from releasing the accelerator pedal to depressing the foot brake pedal is short or long.

The speed detection means 9 detects the opening speed V of the accelerator pedal.
For example, there are methods such as detecting the amount of release of the accelerator pedal within a certain period of time, or the return time of the accelerator pedal passing between two predetermined points when the accelerator pedal is released. Specifically, the speed detection means 9 includes: an angle detection means 11 provided near the accelerator pedal for detecting the depression angle of the accelerator pedal; a timer 12 provided in the control means 7; and a timer 12 provided in the control means 7. It is comprised of an angle detection means 11 and a calculation unit 13 that calculates the opening speed V of the accelerator pedal by calculating the angle amount and time output from the timer 12. The time detection means 10 is for detecting the operation time T from the release of the accelerator pedal to the depression of the foot brake pedal, and mainly includes a foot brake pedal depression detection switch 14, a timer 12, and the above-mentioned accelerator switch. 3, and a calculation unit 13 that calculates the operation time T by calculating the ON signals and time outputted from the switches 3 and 14 and the timer 12. Further, the calculation unit 13 compares the set speed Vs and set time Ts that are set in advance with the detected opening speed V and operation time T, respectively.

The control means 7 to which such detected values V and T are input is further configured as follows. First, the control means 7 has an input terminal 7a connected to the clutch switch 2.
and the exhaust brake activation relay 4,
When the three switches 1 to 3 that provide the operating conditions for the exhaust brake are turned on, a battery voltage is supplied that indicates that the conditions are met. The control means 7 is also equipped with a known switching circuit 15. This switching circuit 15 operates at a set speed Vs at which the above-mentioned opening speed V and operation time T are set in advance in the calculation section 13.
above and within the set time Ts, and the three switches 1 to 3 mentioned above are ON.
Since the battery voltage is supplied to the input terminal 7a, the control means 7 is electrically switched (the output terminal 7b of the control means 7 is grounded).
Exhaust brake activation relay 4 is connected from output terminal 7b of
It is configured to output a signal for turning ON.

Note that 16 is an exhaust brake operation confirmation lamp connected in parallel to the electromagnetic solenoid 5.

Next, the operation of the embodiment will be described.

This will be explained according to the control flow shown in FIG.

First, the opening speed V output from the accelerator switch 3, the neutral switch 1, the clutch switch 2, the manual exhaust brake switch 6, the speed detecting means 9 and the time detecting means 10, the operating time T, and other switches 1 to 3 are ON-. Read the OFF signal and proceed to the next step.

The operation of the exhaust brake in the event of a vehicle emergency will be described below according to the control flow.

The opening speed V is higher than the set speed Vs (V≧
Vs), and the operation time T is within the set time Ts (T≦
Ts), proceed to the next step in order to operate the exhaust brake regardless of the switching of the manual exhaust brake switch 6.

Accelerator switch 3, neutral switch 1
and clutch switch 2 are all ON, proceed to the next step.

Here, the valve opening degree is read from the valve opening degree detection means 18 such as a potentiometer provided in the exhaust brake valve 17, and the process proceeds to the next step.

If the valve opening is not fully open, the exhaust brake valve 17
A closing signal is output to the electromagnetic solenoid 5 to operate and maintain the exhaust brake.

On the other hand, when releasing the exhaust brake, the exhaust brake valve 17 is opened when any one of the three switches 1 to 3 is turned off. Further, if necessary, the exhaust brake may be released in response to the foot brake pedal depression detection switch 14 being turned off.

Also, as shown in the figure, the opening speed V is the set speed
When the exhaust brake is less than Vs or when the operation time T exceeds the set time Ts, the exhaust brake is operated not by the above control but by switching the conventional manual exhaust brake switch 6 between ON and OFF.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are achieved.

A control means provided in parallel with a manual exhaust brake switch for operating the exhaust brake is operated in accordance with the opening speed of the accelerator pedal, which indicates an emergency state of the vehicle, and the operation time from releasing the accelerator pedal to depressing the foot brake pedal. Since the exhaust brake is activated, the exhaust brake can be applied quickly in an emergency.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a preferred embodiment of the present invention;
FIG. 2 is a flowchart showing an example of a control flow, and FIG. 3 is a circuit diagram showing a conventional example. In the figure, 6 is a manual exhaust brake switch, 7 is a control means, 9 is a speed detection means, and 10 is a time detection means.

Claims (1)

[Claims] 1. A manual exhaust brake switch for activating the exhaust brake, a speed detection means for detecting the speed at which the accelerator pedal is released, and a time detection means for detecting the operation time from the release of the accelerator pedal to the depression of the foot brake pedal, which are installed in parallel with the above switch. and a control means for operating the exhaust brake according to the detected values of the detection means.