JPH08183371A - Autocruise control method - Google Patents

Abstract

PURPOSE: To improve a drive feeling of a vehicle by releasing applying an assist brake when an accelerator pedal is operated, and restarting control of applying the assist brake after stopping operating the accelerator pedal, during autocruise running of the vehicle. CONSTITUTION: A control unit 1 respectively connects an autocruising main switch 2, set switch 3 of setting and decreasing an autocruise car speed, resume switch 4 of resetting from once releasing an autocruise and of increasing a car speed, and an autocruise release switch 5 or the like. In the control unit 1, a cruise lamp 9 is lighted at autocruise running time, further to transmit a control signal to an electronic governor 10 of a diesel engine, and to adjust a supply amount of fuel, also to control operating an assist brake 11. Here, when an accelerator pedal is operated, applying the assist brake 11 is released, to restart control of applying the assist brake 11 after stopping operating the accelerator pedal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic cruise control method for a vehicle, and more particularly to an automatic cruise control method accompanied by operation control of an auxiliary brake.

[0002]

2. Description of the Related Art In a conventional vehicle, an actual Kaihei 3-88 is used.
As exemplified in Japanese Patent Publication No. 927, the retarder is operated when the engine is in an idle state during auto cruise traveling and the vehicle is in an acceleration state with respect to the target vehicle speed, so that the vehicle speed can be maintained even when the vehicle is traveling downhill. It is controlled to maintain the target vehicle speed.

However, since the control of the retarder is performed based on the acceleration and deceleration of the vehicle, if the accelerator pedal is stepped on and the vehicle is temporarily accelerated while passing the front vehicle while the vehicle is traveling down the auto cruise, There was a problem that the driving feeling was deteriorated because the retarder was activated in response to the acceleration exceeding the target vehicle speed.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to maintain a good driving feeling of a vehicle by preventing the auxiliary brake from being activated when the vehicle is intentionally accelerating during the automatic cruise traveling of the vehicle. It is a thing.

[0005]

In order to achieve this object, an automatic cruise control method according to the present invention operates an auxiliary brake when an accelerator pedal is operated during automatic cruise traveling of a vehicle accompanied by operation control of an auxiliary brake. The control is released so that the operation control of the auxiliary brake is restarted after the operation of the accelerator pedal is stopped.

[0006]

In other words, since the operation control of the auxiliary brake is released when the accelerator pedal is operated during the automatic cruise traveling of the vehicle, even if the vehicle speed is temporarily increased by the operation of the accelerator pedal, the automatic cruise control is performed. Since the auxiliary brake is surely prevented from operating,
It is possible to easily secure the running condition of the vehicle according to the driver's intention, maintain a good driving feeling of the vehicle, and control the operation of the auxiliary brake after the operation of the accelerator pedal is stopped. By restarting the vehicle, it is possible to perform normal auto-cruise traveling with the auxiliary brake appropriately applied.

[0007]

Embodiments of the present invention will be specifically described below. As shown in FIG. 1, a control unit 1 in a vehicle such as a truck has a main switch 2 for auto cruise, a set switch 3 for setting the auto cruise vehicle speed and reducing the auto cruise vehicle speed, and an auto cruise. The resume switch 4 for returning from the temporary release and the increase of the auto cruise vehicle speed, the auto cruise release switch 5, the accelerator switch 6 for detecting the operation of the accelerator pedal, and the stop lamp switch 7 are connected. When the switches are closed, the signals are input to the control unit 1 and the vehicle speed signal is input from the vehicle speed sensor 8. The auto cruise release switch 5
It is closed by a manual switch of the exhaust brake, an operation signal of the clutch and the foot brake, and a neutral signal of the transmission.

Further, the control unit 1 lights the cruise lamp 9 during the automatic cruise traveling,
A signal is sent to an electronic governor 10 of a diesel engine (not shown) to increase or decrease the fuel supply amount to the diesel engine to control the vehicle speed to maintain the auto cruise setting vehicle speed, and the vehicle speed is set to the auto cruise setting while the engine brake is operating. When the vehicle speed is exceeded, the operation of the auxiliary brake 11 is controlled so as to approach the set vehicle speed.

The auxiliary brake 11 comprises an exhaust brake 12, a compression pressure release type engine brake auxiliary device 13, a first stage retarder 14 and a second stage retarder 15. The exhaust brake 12 exerts a braking force depending on the strength of the throttle of the exhaust pipe. It is possible that the compression pressure release type engine brake auxiliary device 1 is used.
3 is for obtaining a braking force by, for example, opening a third valve provided in an appropriate engine cylinder from the compression stroke to the expansion stroke, and the retarders 14, 15 change the blade angle of the stator in, for example, a fluid retarder. Then, the braking force is increased or decreased by adjusting the flow rate of the retarder, but it goes without saying that the retarder is not necessarily limited to the fluid type.

The auxiliary brake 11 is provided with the exhaust brake 1 as the deviation between the vehicle speed and the auto cruise set vehicle speed increases and / or the deceleration of the vehicle decreases.
2, compression pressure release type engine brake auxiliary device 13, first
The stage retarder 14 and the second stage retarder 15 are sequentially additionally operated to sequentially increase the auxiliary braking force, and conversely, as the deviation between the vehicle speed and the auto cruise set vehicle speed decreases, and / or When the deceleration of is relatively large, the respective operations are released in the reverse order to the above, and the auxiliary braking force is controlled to be successively reduced. The order of operation and release of each of the above means in the auxiliary brake 11 can be changed as appropriate.
Needless to say, the type and number of each of the above means in the auxiliary brake 11 are not limited to the above and can be changed at any time.

That is, when the vehicle reaches a desired speed after the main switch 2 is closed while the vehicle is traveling, the set switch 3 is closed and the vehicle speed at that time is set as the auto cruise vehicle speed. When the vehicle starts traveling, the output of the diesel engine is adjusted by the control of the electronic governor 10 by the control unit 1 and the vehicle speed is maintained at the auto cruise set vehicle speed. However, the vehicle speed increases due to traveling downhill, etc. When the vehicle continues to operate even if the engine brake is applied due to the fuel cut to the engine, the auxiliary brake 11 is automatically controlled by the control unit 1 so as to operate in the above order. It

On the other hand, the operation control of the auxiliary brake 11 performed by the control unit 1 will be described when the accelerator pedal is depressed to overtake the preceding vehicle during the automatic cruise traveling and the vehicle is temporarily accelerated. Then, as shown in FIG. 2, in step S1, it is checked by the accelerator switch 6 whether the accelerator pedal is operating. If the accelerator pedal is not depressed, the routine proceeds to step S2 and a flag is set. Is checked,
If the flag has fallen, the process proceeds to step S3, and the operation control of the auxiliary brake 11 by the control unit 1 is performed as described above.

However, when the operation of the accelerator pedal is detected by the accelerator switch 6 in step S1, the process proceeds to step S4 and a flag is set, and in the next step S5, the operation control of the auxiliary brake 11 is released and the auxiliary brake 11 is released. If any of the brakes 11 are activated, they are all stopped.

If the flag is set in step S2, the process proceeds to step S6 to check whether the vehicle is accelerated, and if it is accelerated, the flag is defeated in step S7 and step S3 is executed. The operation control of the auxiliary brake 11 by the control unit 1 is restarted.

If the vehicle is traveling at a constant speed or is decelerated in step S6, it is determined that the vehicle is decelerating due to the action of the engine brake, and the process proceeds to step S8. In step S8, the current vehicle speed V is auto-cruise. It is checked whether the vehicle speed is within the set vehicle speed V0. If the vehicle speed V is higher than the auto cruise set vehicle speed V0, it is determined that the engine braking is in effect instead of the steep downhill, and the process proceeds to step S5 to operate the auxiliary brake 11. The control is released, and the operation of the auxiliary brake 11 is stopped.

If the vehicle speed V is within the auto cruise set vehicle speed V0 in S8, the process proceeds to step S7, the flag is defeated, and in the next step S3, the control unit 1
Thus, the operation control of the auxiliary brake 11 is performed as usual.

As described above, when the accelerator pedal is depressed and temporarily accelerated while the operation of the auxiliary brake 11 is controlled by the control unit 1 during the automatic cruise traveling of the vehicle, even if the current vehicle speed V is reached. Is greater than the auto cruise set vehicle speed V0, the control of the auxiliary brake 11 is released and all the operations of the auxiliary brake 11 are stopped. Also, when the accelerator pedal that has been stepped on is released, the vehicle is actuated by the engine brake. If is decelerated, the control of the auxiliary brake 11 is released until the vehicle speed V becomes within the auto cruise set vehicle speed V0, and the operation of the auxiliary brake 11 is completely stopped. On the other hand, the accelerator pedal that was once depressed is returned. Even when the vehicle is accelerating, and the vehicle speed V is set to the auto cruise set vehicle speed V due to the action of the engine brake. When it drops below 0,
Auxiliary brake 1 by control unit 1
The operation control of No. 1 is restarted.

Therefore, even if the auxiliary brake 11 is operated during the automatic cruise traveling of the vehicle, the operation control of the auxiliary brake 11 is released when the vehicle is temporarily accelerated by the operation of the accelerator pedal. As a result, the braking action is stopped, so that the operation of the auxiliary brake 11 contrary to the driver's intention can be reliably eliminated, and the driving feeling of the vehicle can be maintained well, and the first brake of the auxiliary brake 11 can be maintained. The useless operation of the stage retarder 14 and the second stage retarder 15 has a side effect of automatically suppressing an increase in their temperatures.

In the above embodiment, the control route is divided according to whether or not the vehicle is accelerating when the accelerator pedal which has been once depressed is returned. If the vehicle is below the set deceleration, the control unit controls the operation of the auxiliary brake as usual.If the vehicle exceeds the set deceleration, the vehicle speed will be adjusted according to the vehicle speed. Thus, even if the control is performed in the same manner as in the above-described embodiment, the same operational effect as that in the above-described embodiment can be obtained.

[0020]

According to the automatic cruise control method of the present invention, since the operation control of the auxiliary brake is released when the accelerator pedal is operated during the automatic cruise traveling of the vehicle, the vehicle speed is temporarily changed by the operation of the accelerator pedal. The auxiliary brake is surely prevented from operating in accordance with the automatic cruise control even if the driving force increases, so that it is possible to easily ensure the running state of the vehicle that is in line with the driver's intention and to drive the vehicle. It is possible to maintain a good feeling.

[Brief description of drawings]

FIG. 1 is a schematic layout diagram in an embodiment of the present invention.

FIG. 2 is a control flowchart of the above embodiment.

[Explanation of symbols]

 1 Control Unit 2 Main Switch for Auto Cruise 3 Set Switch 4 Resume Switch 5 Auto Cruise Release Switch 7 Stop Lamp Switch 8 Vehicle Speed Sensor 10 Electronic Governor 11 Auxiliary Brake 12 Exhaust Brake 13 Compressed Pressure Release Type Engine Brake Auxiliary Device 14 First Stage Retarder 15 second stage retarder

Claims (6)

[Claims] 1. The automatic brake traveling of the vehicle accompanied by the operation control of the auxiliary brake, the operation control of the auxiliary brake is released when the accelerator pedal is operated, and the operation control of the auxiliary brake is restarted after the operation of the accelerator pedal is stopped. Auto cruise control method to control. 2. The automatic cruise control method according to claim 1, wherein operation control of the auxiliary brake is performed based on a vehicle speed deviation between a vehicle speed and an auto cruise set vehicle speed. 3. The automatic cruise control method according to claim 1, wherein when the operation of the accelerator pedal is stopped, the operation control of the auxiliary brake is restarted if the vehicle is accelerated. 4. The automatic cruise control method according to claim 3, wherein if the vehicle is not accelerated, the operation control of the auxiliary brake is released or restarted depending on the presence or absence of the vehicle speed deviation. 5. The automatic cruise control according to claim 1 or 2, wherein when the operation of the accelerator pedal is stopped, the operation control of the auxiliary brake is restarted if the vehicle is below a set deceleration. Method. 6. The automatic cruise control method according to claim 5, wherein if the vehicle exceeds the set deceleration, the operation control of the auxiliary brake is released or restarted in accordance with the presence or absence of the vehicle speed deviation.