JPS631726A - Exhaust brake device - Google Patents

Abstract

PURPOSE:To rapidly and precisely brake a car in case of emergency by controlling the function of an exhaust brake on the basis of the opening speed of an accel pedal and operating time required from releasing the said pedal to operating a foot brake pedal. CONSTITUTION:A manual exhaust brake switch 6 is connected through a relay coil 8 to a position between functioning relay 4 for the exhaust brake and a clutch switch 2, and thereby the relay 4 is turned on when each of switches 1-3 has been turned on. On the other hand, a control means 7 is connected to a position between said switch 6 and a relay coil 8 in parallel with said switch 6, and a speed detecting means 9 and a time detecting means 10 are connected to said control means 7 respectively. Thus, the time detecting means 10 is composed of a detecting switch 14 for the operation of a foot brake pedal, a timer 12, an accel switch 3, and an operating part 13 to calculate an operating time on the basis of outputs obtained from said switches 3, 12, 14.

Description

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

[Prior art 1] 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 d that are connected in series to provide operating conditions for the exhaust brake. are connected 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 connected state, and accelerator switch C is turned on when the foot is released from the accelerator pedal and is in the released state. Further, the manual exhaust brake switch d is configured to be manually switched from ON to OFF.

And the exhaust brake device has all these switches a
When -d is turned on, exhaust braking force is generated. Specifically, when all switches a to d are turned on, relay e is turned on and mm solenoid f is energized, and as a result, the butterfly valve is closed and the exhaust brake is activated. There is.

Note that 9 is a battery, and h is an exhaust brake operation confirmation lamp.

[Problems to be solved by the invention] Conventionally, the above-mentioned four switches a to
There was a problem that the exhaust brake could not be operated unless d1, that is, four conditions were met. In particular, when a vehicle suddenly falls into an emergency situation from a normal driving condition, a quick response is required, and vehicle braking is particularly important. In addition to releasing the accelerator pedal and turning on the accelerator switch C (indicated by (A) in the figure), it is also necessary to turn on the manual exhaust brake switch d, which actually activates the exhaust brake. The vehicle had to run for a considerable distance before the brakes started to take effect.

A second exhaust brake activation switch connected in parallel with the manual exhaust brake switch is activated by a control circuit that outputs a drive signal in response to the vehicle speed being higher than a set speed and the foot brake pedal being depressed. [Exhaust brake control device] that operates the exhaust brake
(Japanese Unexamined Patent Publication No. 59-120741) has been proposed. This proposal connects a second exhaust brake operating switch in parallel to the manual exhaust brake switch, thereby eliminating 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 running at a low speed below the set vehicle speed, it is considered that the above-mentioned problem cannot be satisfactorily solved if the vehicle speed is used as the operating condition. Also, the foot brake pedal is 0N-OF.
F itself is a normal vehicle stopping operation and cannot necessarily be used as an indicator of a particularly critical state of the vehicle, and is considered to be unsatisfactory as an operating condition for solving the above problem.

[Means for Solving Problem No. 181] The present invention provides 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 manual exhaust brake switch for operating the exhaust brake, a speed detection means for detecting the speed at which the accelerator pedal is released, and an operation system from the time when the accelerator pedal is released to when the brake pedal is depressed. This device includes a time detection means for time detection, 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 receives the accelerator pedal opening speed and the accelerator pedal release speed from the accelerator pedal release to the foot brake pedal depression as an index indicating an emergency state. When the operation time is input and the opening speed is equal to or higher than the set speed and the operation time is within the set time, the exhaust brake is operated by the control means regardless of the switching operation of the manual exhaust brake switch. It is something.

[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 operating 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 excited by energization to drive the exhaust brake valve and operate the exhaust brake 1IR1! Solenoid 5 is connected. 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. Furthermore, the accelerator switch 3 is turned on when the accelerator pedal is released and is in the open state.
It is designed to turn OFF when the pedal is pressed. These are the same as before. Further, the exhaust brake activation relay 4 is connected to a manual exhaust brake switch 6 which will be described later.
N, or ONI is generated according to the $ control output from the idJ 111 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 activation 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 is configured to be manually switched from ON to OFF as in the past, and is turned ON when the three switches 1 to 3 are ON, thereby turning on the exhaust brake activation relay 4. It is designed to operate ON.

On the other hand, between the manual exhaust brake switch 6 and the relay coil 8, a control means 7 such as a microcomputer is connected in parallel to the manual exhaust brake switch 6, and the lli control means 7 has a A speed detecting means 9 and a time detecting means 1o are connected to each other for outputting a detected value.

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 period from the release of the accelerator pedal to the depression of the foot brake pedal are used. Adopt under operation time. This corresponds to the operation in which the driver instantly releases the accelerator pedal and quickly depresses the brake pedal when the vehicle is in an emergency situation. By detecting whether the release speed V is fast or slow and whether the operating time T from releasing the accelerator pedal to pressing the brake pedal is short or long, I! can do.

The speed detection means 9 is for detecting the opening speed V of the accelerator pedal, for example, the amount of opening of the accelerator pedal within a certain period of time, or the rate at which the accelerator pedal passes between two points determined by the opening of the accelerator pedal. There are methods such as detecting the return time of 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 composed of an angle detection means 11 and a calculation section 13 that calculates the opening speed V of the accelerator pedal by calculating the angle interval and time output from the timer 12. Also, time detection means 1
0 is for detecting the operating time T from the release of the accelerator pedal to the depression of the foot brake pedal,
Mainly a 7-point brake pedal depression detection switch 14,
The timer 12, the above-mentioned accelerator switch 3, the ON signals and time outputted from these switches 3, 14, and the timer 12 are processed and l! It is composed of a calculation section 13 that calculates the operation time T. 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 911111 means 7 to which such detection 1aV and T are input is further configured as follows. First, the input terminal 7a of the control means 7 is connected between the clutch switch 2 and the exhaust brake operating relay 4, and when the three switches 1 to 3 that provide the operating conditions for the exhaust brake are turned on, the control means 7 receives the conditions. A battery voltage indicating that the battery voltage is satisfied is supplied. The control means 7 is also equipped with a known switching circuit 15. This switching circuit 15 has an opening speed V as described above in the calculation section 13.
and that the operation time T is greater than or equal to the preset speed VS and less than the preset setting time flTs, and that the three switches 1 to 3 described above are turned on and the input terminal 7a
is electrically switched by the battery voltage being supplied to (the output terminal 7b of the control means 7 is grounded), and a signal for turning on the exhaust brake activation relay 4 is output from the output terminal 7b of the control means 7. is configured to do so.

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, accelerator switch 3, neutral switch 1,
The opening speed V output from the clutch switch 2, the manual exhaust brake switch 6, the speed detection means 9 and the time detection means 10, the operation time T, and the 0N- of the switching switches 1 to 3.
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 lfv is higher than the set speed VS (V2V5)
, and if the operation time T is within the set time Ts (T≦Ts), the process proceeds to the next step in order to operate the exhaust brake regardless of whether the manual exhaust brake switch 6 is switched.

If the 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, a closing signal is output to the electromagnetic solenoid 5 to close the exhaust brake valve 17, and the exhaust brake is operated and maintained.

On the other hand, when releasing the exhaust brake, the exhaust brake valve 17 is closed 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.

Further, as shown in the figure, when the opening speed V is lower than the set speed Vs or the operation time T exceeds the set time Ts, the above υ
J sin, not the conventional manual exhaust brake switch 6 0
The exhaust brake is operated by switching to N-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 activating 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 operating time from the opening of the accelerator pedal to the depression of 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] 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 are provided in parallel with the switch. , and a control means for operating an exhaust brake according to the detected values of these detection means.