JPH0352993Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an exhaust brake control device, and particularly to one in which the exhaust brake is automatically controlled according to the return speed of the accelerator pedal.

[Prior art] Generally, the exhaust brake must be turned on and off by the driver's switch operation.
During normal driving, the exhaust brake cannot often be used effectively.

Therefore, if the exhaust brake is not turned on, if you suddenly need to brake while driving, you will have to immediately release the accelerator pedal and put your foot on the brake pedal, so be very careful. However, when traveling long distances, the burden on the driver becomes particularly heavy.

Therefore, in order to reduce the burden on the driver, it has been considered to link the exhaust brake and the accelerator pedal. Such conventional technology, for example, as shown in Japanese Utility Model Application No. 58-146046, automatically turns on the exhaust brake when the accelerator is fully closed, regardless of the return speed of the accelerator pedal.
There is something I tried to do.

[Problems that the invention aims to solve] However, in the conventional system described above, the exhaust brake is always turned ON when the accelerator pedal is fully closed and returns to its original position, regardless of the speed at which the accelerator pedal is returned. Even when the braking force of the exhaust brake is not required due to gradual return, the exhaust brake is turned on, making effective braking control impossible. On the other hand, there has been a problem in which the exhaust brake becomes stiff even if some drivers wish to drive the vehicle while keeping the accelerator fully closed and without applying the exhaust brake.

[Purpose of the invention] The purpose of the invention is to relate the operation of the exhaust brake to the return speed of the accelerator pedal.
To provide an exhaust brake control device which solves the above problems and prevents deterioration of drivability due to the exhaust brake by activating the exhaust brake only when truly necessary when operating an accelerator pedal. .

[Summary of the invention] The structure of the present invention in accordance with the above object is as shown in FIG.
This detector output is input to the controller 3 along with vehicle speed, engine speed, and gear position information. This controller 3
, the return speed of the accelerator pedal is equal to or higher than the specified value,
An activation signal is output only when it is simultaneously detected that the vehicle speed or engine speed exceeds a set value and that the gear position is other than neutral.
A brake valve 5 is provided in the exhaust system 4 and is closed in response to an activation signal output from the controller 3 to turn on the exhaust brake.

This prevents the exhaust brake from turning on during gradual deceleration when the return speed of the accelerator pedal is below a predetermined value, and conversely, during rapid deceleration when the return speed exceeds a predetermined value, the exhaust brake is turned on and the braking force is applied by the exhaust brake. It is designed to give the vehicle the following:

[Example] An example of the present invention will be described below based on FIGS. 1 and 2.

FIG. 1 shows the exhaust brake control device of the present invention. A displacement meter, for example, a potentiometer 6, is attached to the accelerator pedal 1 to detect the amount of operation of the accelerator pedal. The detection output of the potentiometer 6 is inputted, together with vehicle speed, engine rotational speed, and gear position signals, to a controller 3 consisting of, for example, a microcomputer. In this embodiment, the detection output of the potentiometer 6 when the accelerator pedal 1 is depressed is read once into the controller 3, and then read again after a predetermined period of time has elapsed to calculate the return speed of the accelerator pedal 1. A calculation section 7 is provided.

The output of the controller 3 is connected to a solenoid valve 10 that controls the supply of air pressure from an air tank 8 to an actuator 9. The opening and closing of this solenoid valve 10 controls the opening and closing of a brake valve 5 driven by the actuator 9. The brake valve 5 is part of the exhaust system 4 of the engine 11.
It is installed inside to control the amount of exhaust gas discharged. The air tank 8, solenoid valve 10, actuator 9, brake valve 5, and air supply path constitute an exhaust brake.

FIG. 2 is a flowchart illustrating various functions of the controller 3. First, the first accelerator pedal depression amount S ₁ is read from the potentiometer 6, and after a predetermined time Δt has passed since reading, the depression amount S ₂ (≦
Load _S1 ). This predetermined time can be short enough to determine the slowness or steepness of the return speed of the brake pedal, and if this is set as a unit time, if the difference in the amount of depression S ₂ - _{S 1} is negative, this will be the amount of return. That value is the return speed. Note that the number of times of reading is not limited to two.

After determining the depressing speed, especially the return speed S ₂ - _{S 1} when it is negative, it is determined whether this is less than the predetermined value SL that determines whether it is slow or fast. Assuming that the accelerator pedal is suddenly released, the next step is to determine whether the gear position is in neutral. Specifically, this judgment is made possible by detecting ON/OFF of the clutch. If it is neutral, return to the start, but if not, proceed to the step to read the engine speed Er. Furthermore, in order to avoid unexpected braking being applied to the vehicle, do not proceed to this step during a gear change.

Then, it is determined whether or not the read engine speed Er is greater than or equal to the set value that requires exhaust braking force.If the engine speed Er is below, the exhaust brake is not required, so the process returns to the start; if it is above, the exhaust braking force is applied. Assuming that a strong braking force is required, the controller 3 outputs an actuation signal to activate the solenoid valve 1.
0 is opened, air is introduced from the air tank 8 to the actuator 9, the brake valve 5 is closed, and the exhaust brake is turned on.

With this exhaust brake in effect, after going through a confirmation step (consisting of 4 steps) to confirm that the returned accelerator pedal has not been depressed in the opposite direction, the engine speed Er is read again and the engine speed is It is determined whether or not the number Er is greater than or equal to the set value EL.If it is above, it is assumed that the braking is not yet sufficient and the reading continues after the confirmation step.On the other hand, if it is below, the braking is applied sufficiently and the exhaust brake amount is reduced. Turn off the exhaust brake as it is no longer needed
Proceed to step , and the flow ends.

In addition, in the above-mentioned confirmation step, first, Δt
After storing the amount of depression S ₂ read after the time as S _B , the third amount of depression of the accelerator pedal S ₃ is read. Next, it compares the magnitude of this depression amount S ₃ with S _B that was memorized earlier, and if S _B ≧ S ₃ , it determines that the accelerator pedal that was about to be released is trying to accelerate by depressing the accelerator pedal in the opposite direction, and applies the exhaust brake. On the other hand, when S _B > S ₃ , after switching the memory contents of S _B to the new depression amount S ₃ , the engine speed Er
It is now ready to proceed to the loading step.

That is, this confirmation step eliminates the problem of the exhaust brake being turned on and then released when the accelerator pedal is depressed again.

That is, if the return speed of the accelerator pedal 1 is fast,
At the same time, the exhaust brake is turned on, and if the engine speed drops due to the braking of this exhaust brake, the exhaust brake is automatically turned off, allowing you to avoid engine stalling.However, when the return speed of accelerator pedal 1 is slow, the exhaust brake is turned off. controlled so that it does not occur.

Therefore, even if you suddenly release the accelerator pedal 1 to apply the brakes, the exhaust brake is turned on, eliminating the need to reposition your foot on the brake pedal, reducing the burden on the driver when driving long distances. becomes less. In addition, the return speed of the accelerator pedal 1 is linked to the exhaust brake, so that the exhaust brake does not operate when the accelerator is fully closed. It is also possible to drive without using the system.

Furthermore, when no braking force is required, such as when gradually releasing the accelerator pedal, the exhaust brake does not operate, ensuring smooth operation.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) The exhaust brake is turned on when the accelerator pedal returns at a rapid deceleration of more than a predetermined value, and is not turned on during gradual deceleration when the return speed of the accelerator is less than a predetermined value, so when a strong amount of braking is required. The exhaust brake can only be operated effectively.

(2) Therefore, the driver's intention can be sufficiently transmitted to the braking control, and drivability using the exhaust brake can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an exhaust brake control device according to the present invention, and FIG. 2 is a flowchart illustrating various functions of the controller shown in FIG. In the figure, 1 is an accelerator pedal, 2 is a detector, 3 is a controller, 4 is an exhaust system, 5 is a brake valve, 6 is a potentiometer as a displacement meter, and 7 is a calculation unit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A detector that detects the return speed of the accelerator pedal, and a sensor that simultaneously detects a return speed exceeding a predetermined value, a vehicle speed or engine rotation speed exceeding a set value, and a gear position other than neutral. An exhaust brake control device that includes a controller that outputs a signal and a brake valve provided in an exhaust system that closes in response to the signal. (2) The detector comprises a displacement meter that detects the amount of operation of the accelerator pedal, and a calculation unit that reads the detection output of the displacement meter once and then reads it again after a predetermined period of time to calculate the return speed of the accelerator pedal. An exhaust brake control device according to claim 1, characterized in that: