JPH082736B2 - Vehicle constant-speed running device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a constant-speed traveling device for automatically traveling a vehicle at a desired constant speed, and particularly when it is desired to slightly raise or lower a target vehicle speed. , A constant-speed traveling device capable of smoothly shifting the vehicle speed to the new target vehicle speed.

(Prior Art) A constant-speed traveling device (auto cruise device) that automatically travels a vehicle at a set speed (target vehicle speed) is known in order to reduce the burden on the driving operation when the vehicle travels at a constant speed.

FIG. 1 shows the configuration of a constant speed traveling device, in which a driver reaches a desired speed with a speedometer (not shown) after turning on a main switch 1 for selecting an auto cruise mode in order to perform an auto cruise operation. When the set switch 2 is manually operated (turned on) to set the target vehicle speed (auto cruise speed), the controller 3 sets the target vehicle speed and the vehicle speed from the vehicle speed sensor 4 based on a predetermined control law. According to the deviation from the signal (actual vehicle speed), the opening of the throttle valve 6 is controlled via the throttle drive circuit 5,
Adjust the output of the engine 10 to maintain the target vehicle speed. Then, when the driver steps on the brake pedal (not shown), the stopper plump switch 7 which is interlocked with the brake pedal and also has a function as a cancel switch is turned on and the automatic cruise operation is canceled. After that, when the resume switch 8 is turned on, the automatic cruise operation is restarted. In addition, a shift lever (not shown) of the automatic transmission 11
An inhibit switch 9 that works as a cancel switch is provided to prevent the automatic cruise operation from being canceled when the drive force from the engine 10 is not transmitted to the wheels when the automatic transmission 11 is in the neutral shift position.
I am trying to prevent 10 blowing up.

Also, during auto cruise operation, the resume switch 8
If you continue to press, the vehicle will accelerate, and you can set the vehicle speed at the time you release your finger from the resume switch 8 to a new target vehicle speed, or if you continue to press the set switch 2 during auto cruise operation, the vehicle will decelerate, It is also known that the vehicle speed at the time when the finger is released from the set switch 2 can be set to a new target vehicle speed.

When the target vehicle speed is changed during such an auto cruise operation, the controller 3 operates in accordance with a predetermined control law.
Acceleration processing (ACC processing) or deceleration processing (DEC processing) is executed. For example, when it is desired to continue pressing the resume switch 8 during the automatic cruise operation to accelerate the vehicle (in the case of ACC processing), the control is performed as follows in consideration of the control response. That is, the throttle valve is gradually opened until the acceleration of the vehicle reaches a predetermined value, and after the acceleration becomes constant, the throttle valve opening is controlled so that the acceleration is maintained. Then, when the finger is released from the resume switch 8, the throttle valve opening is controlled so that the vehicle speed at that time is maintained as a new target vehicle speed.

Reference numeral 14 is a throttle valve opening sensor that detects the valve opening of the throttle valve 6, and reference numeral 15 is a hydraulic control circuit that switches the shift stage of the automatic transmission 11 according to a shift command signal from the controller 3 during auto cruise. is there.

(Problems to be solved by the invention) When it is desired to slightly increase the target vehicle speed during auto cruise,
Or you may want to lower it slightly. In such a case, in the conventional constant speed traveling device, it is necessary to operate the resume switch 8 or the set switch 2 to set a new target vehicle speed. For example, if the resume switch 8 is operated to slightly increase the target vehicle speed. As described above, the ACC process is executed, and the controller 3 once tries to open the throttle valve until the acceleration of the vehicle reaches a predetermined value in consideration of the control response. Not only was it difficult to adjust, but the driving feeling was also bad.
Further, in the conventional ACC processing, there is a problem that gear shift shock occurs because the gear is always downshifted from the fourth speed to the third speed.

Further, in the conventional vehicle speed control device in which the set switch 2 is operated to slightly lower the target vehicle speed, deceleration processing (DEC) for temporarily closing the throttle valve is executed.
Not only was the feeling of deceleration great even with a slight deceleration, the driving feeling was not good, and it was difficult to set the target vehicle speed.

The present invention has been made in order to solve such a conventional problem, and when it is desired to change and set the target vehicle speed to a slightly higher value or a lower value, this can be reliably set, and further, a shift shock or An object of the present invention is to provide a constant speed traveling device in which useless gear shifting operation is not performed.

(Means for Solving the Problems) According to the present invention for achieving the above object, at least a higher vehicle speed is obtained at the same engine speed.
And a second shift stage for obtaining a lower vehicle speed, and an automatic transmission that switches between the first shift stage and the second shift stage according to the operating state of the vehicle. In a constant-speed traveling device that adjusts the output of an engine mounted to maintain a vehicle speed near a target vehicle speed, a vehicle speed sensor that detects the vehicle speed and a single predetermined switch operation increases the target vehicle speed by a first predetermined value. The target value change switch means for changing and setting is provided, and the deviation between the new target vehicle speed set by the switch operation of the target value change switch means and the actual vehicle speed is the second.
When the deviation between the new target vehicle speed and the actual vehicle speed detected by the vehicle speed sensor is larger than the second predetermined value, the shift from the first shift speed to the first shift speed is prohibited. When the actual vehicle speed reaches the vehicle speed lower than the new target vehicle speed by the third predetermined value,
There is provided a constant speed traveling device for a vehicle, characterized in that the second speed is switched to the first speed.

Preferably, a second target value change switch means is provided,
The target vehicle speed is changed and set to a value lower by the fourth predetermined value by one switch operation of the second target value changing switch means.

Further preferably, when the actual vehicle speed detected by the vehicle speed sensor reaches a vehicle speed lower than the new target vehicle speed set by the switch operation of the target value changing switch means by a third predetermined value, a predetermined time elapses. It is desirable to switch from the second shift speed to the first shift speed.

(Operation) The specially provided target change switch means changes the target vehicle speed to a value higher by a predetermined value by one switch operation. Preferably, this predetermined value is usually a control responsiveness. The throttle valve is once set to a minute value in a range where it is not necessary to open or close the valve until the vehicle has a constant acceleration. Therefore, in the constant speed traveling device, the valve opening of the throttle valve is controlled so as to eliminate a slight deviation between the new target vehicle speed and the vehicle speed. Then, when the deviation between the new target vehicle speed and the actual vehicle speed set by the target value change switch means is smaller than the second predetermined value, that is, when the change in the target vehicle speed is small, useless shift of the shift speed is prohibited, When the deviation between the new target vehicle speed and the actual vehicle speed is larger than the second predetermined value, the first gear is downshifted to the second gear, which increases the output of the engine and accelerates quickly. .

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

The constant-speed traveling device in this embodiment is provided in a vehicle equipped with a gasoline engine, and its configuration (hardware) is substantially the same as that shown in FIG. Since only the control programs (software) that are executed differ, the description of the configuration will be omitted and FIG. 1 will be referred to when necessary in the following description.

The resume switch 8 of the constant speed traveling device of the present invention has a function of restarting the automatic cruise operation by turning on the resume switch 8 after the automatic cruise operation is interrupted by depressing the brake pedal. When this is operated, two more functions are added, one of which is a function of tapping the resume switch 8 to set the target vehicle speed Vo to a value higher by a predetermined value, and the other one. The ACC process is executed by continuously pressing the resume switch 8, the vehicle is accelerated until the finger is released from the resume switch 8, and the vehicle speed at the time of release is set to a new target vehicle speed Vo.

On the other hand, the set switch 2 of the constant speed traveling device of the present invention is
After turning on the main switch 1 during normal traveling, by turning on the set switch 2 to set the target vehicle speed Vo and start the constant vehicle speed control, in addition to the conventional function,
Two more functions are added by the ON operation during auto cruise. That is, one of them is a function of setting the target vehicle speed Vo to a lower value by a predetermined value by tapping the set switch 2, and the other function is to perform deceleration processing (DEC processing) by continuously pressing the set switch 2. The function is to decelerate the vehicle until the finger is released from the set switch 2, and set the vehicle speed at the time of release to a new target vehicle speed Vo.

The flowchart shown in FIG. 2 shows the control procedure when the resume switch 8 or the set switch 2 is operated during the automatic cruise to change the target vehicle speed Vo to a new value. This routine is repeatedly executed at a predetermined cycle during auto cruise, and the controller 3 first determines whether or not the resume switch 8 has been turned on (step S20). If this determination is affirmative (Yes), the process proceeds to step S21, and it is determined whether or not the on time of the resume switch 8 is longer than a predetermined time t _RS (for example, 0.5 seconds). This determination is to determine whether to perform tap acceleration processing or ACC processing according to the on-operation time of the resume switch 8.
When the ON time is longer than the predetermined time t _RS by the ON operation of, the process proceeds to step S23, and the ACC process is executed.

The ACC process may be performed by controlling the vehicle speed according to a conventionally known control law. For example, when the resume switch 8 is kept on, the throttle valve 6 is gradually opened until the vehicle acceleration reaches a predetermined value. When the acceleration reaches a predetermined value, the valve opening of the throttle valve 6 is controlled so that the acceleration is maintained at the predetermined value. During this period, the vehicle speed V increases at a constant acceleration. Then, when the vehicle speed V increases and reaches the desired vehicle speed, the driver releases the finger from the resume switch 8, and the vehicle speed at the time of release is set as the target vehicle speed Vo.

On the other hand, if the determination result in step S1 is negative (No), that is, if the on time of the resume switch 8 is shorter than the predetermined time t _RS , the process proceeds to step S22 and the tap acceleration process is executed.

In this tap acceleration processing, the target vehicle speed Vo is set to a value higher by a predetermined value ΔV _ACC by one tap operation of the resume switch 8, and the predetermined value ΔV _ACC is, for example, 1.5k.
Set to m / h. When the tap acceleration process is executed, the target vehicle speed Vo is reliably set to a value higher by the predetermined value ΔV _ACC , and the vehicle speed is controlled using this new target vehicle speed Vo based on the predetermined control law. The target vehicle speed Vo is set to a predetermined value Δ
When it is desired to set the value about twice or three times larger than V _ACC, the desired target vehicle speed Vo can be reliably set by repeating the tap operation of the resume switch 8 a necessary number of times.

When the resume switch 8 is not turned on, that is, when the determination result in step S20 is negative,
In step S25, it is determined whether the set switch 2 has been turned on. If neither the resume switch 8 nor the set switch 2 is turned on, the routine is ended without doing anything. On the other hand, if the set switch 2 is turned on, the process proceeds to step S27, and it is determined whether or not the on time of the set switch 2 is longer than a predetermined time t _ST (for example, 0.5 seconds). For this determination, whether tap deceleration processing should be performed depending on the ON time of the set switch 2, DE
Whether or not the C process should be performed is determined. If the ON time of the set switch 2 is longer than the predetermined time t _ST , the process proceeds to step S28, and the DEC process is executed.

This DEC process may be a conventionally known process, for example, the vehicle is gradually decelerated by closing the throttle valve 6 until a predetermined acceleration is reached, and when the predetermined value is reached, the acceleration is maintained. The opening degree of the throttle valve 6 is controlled, and the vehicle speed V is decelerated at a constant rate. When the vehicle speed V reaches the vicinity of the desired vehicle speed and the driver releases the finger from the set switch 2, the vehicle speed V at that time is stored as a new target vehicle speed Vo, and the vehicle speed V is kept at this target vehicle speed Vo. The throttle valve opening is adjusted.

Next, when the ON time of the set switch 2 is shorter than the predetermined time t _ST , that is, when the determination result of step S27 is negative, the process proceeds to step S29, and tap deceleration processing described later is executed.

In this tap deceleration processing, the target vehicle speed Vo is set to a value lower by a predetermined value ΔV _DEC (for example, 1.5 km / h) by one tap operation, and a predetermined control is performed using this new target vehicle speed Vo. If the vehicle speed is controlled based on the law, the vehicle speed V can be reliably controlled to the target vehicle speed Vo that is lower by the predetermined value ΔV _DEC . Also in this tap deceleration process, if the set switch 2 is tapped a required number of times with an appropriate interval, it is possible to reliably set the target vehicle speed lower by an integral multiple of the predetermined value ΔV _DEC according to the number of tap operations.

FIG. 3 shows an upshift from the third speed to the fourth speed (overdrive speed) of the automatic transmission 11 during vehicle speed control, and 4
The control procedure for downshifting from the third gear to the third gear is shown. Deviation Δ between target vehicle speed Vo and actual vehicle speed V during cruise operation of the vehicle
V occurs when the target vehicle speed Vo is suddenly changed by the above-mentioned tap processing, or when the engine load suddenly increases due to a transition from a flat road to an uphill road and the throttle valve opening is greatly opened. It is considered that the target vehicle speed Vo cannot be maintained. In the former case, the engine load does not change significantly. Therefore, in order to shift the vehicle speed to the newly set target vehicle speed Vo, in the latter case, the engine output required to maintain the target vehicle speed Vo. Does not require much engine power increase as compared to The shift control procedure shown in FIG. 3 is for executing shift control suitable for tap processing in consideration of such a situation.

The controller 3 first determines whether the overdrive stage (0D) is on, that is, whether the shift stage is set to overdrive (step S30). If the determination is affirmative, the process proceeds to step S32, and the vehicle speed deviation ΔV between the target vehicle speed Vo and the actual vehicle speed V is caused by the above-described tap processing, or occurs during auto cruise, for example, when climbing an uphill. Determine if something. This determination can be easily made based on whether or not the target vehicle speed Vo has been updated by the tap processing. Then, if the vehicle speed deviation ΔV is caused by the tap processing, the process proceeds to step S40, and the 4-3 shift control at the time of the tap processing is executed.

FIG. 4 shows a flow chart of the 4-3 shift control at the time of tap processing, in which the controller 3 determines the deviation between the target vehicle speed Vo newly set by the tap processing and the actual vehicle speed V detected by the vehicle speed sensor 4. Predetermined value ΔV _TP1 (for example, 4k
m / h) is determined. If it _does not exceed the predetermined value ΔV _TP1 , the process proceeds to step S43, and the shift stage shift of 4-3 shift is prohibited for the predetermined time t _TP1 . FIG. 8 shows the gear shift control after the tap processing, in which the target vehicle speed Vo newly set by the tap processing is equal to or lower than the target vehicle speed immediately before the tap processing by a predetermined value ΔV _TP1 , In such a case, the deviation between the newly set target vehicle speed Vo and the actual vehicle speed V (shown by the broken line in FIG. 8A) is a predetermined value Δ.
V _TP1 is not exceeded, and the gear shift of 4-3 shift is prohibited for a predetermined time t _TP1 and the transmission 11 is held at the overdrive gear (see FIG. 8 (b)).

In step S41 of FIG. 4, if the determination result is affirmative, that is, if the deviation between the newly set target vehicle speed Vo and the actual vehicle speed V exceeds the predetermined value ΔV _TP1 , the process proceeds to step S45 and immediately 4- 3 shifts are executed. FIG. 9 shows the gear shift control after the tap processing, in which the target vehicle speed Vo newly set by the tap processing is set to be higher than the vehicle speed immediately before the tap processing by a predetermined value ΔV _TP1. , The deviation between the newly set target vehicle speed Vo and the actual vehicle speed V (shown by the broken line in FIG. 9 (a)) exceeds a predetermined value ΔV _TP1 , and in such a case, the target vehicle speed Vo and the actual vehicle speed V When the deviation between and exceeds a predetermined value ΔV _TP1 , 4-3 shift is immediately executed (see FIG. 9 (b)).

Returning to FIG. 3, if the determination result in step S32 is negative, that is, if the vehicle speed deviation ΔV is not caused by the tap processing, the process proceeds to step S50, and 4-3 shift control during cruise is executed.

FIG. 5 shows a flowchart of the 4-3 shift control during cruise, in which the controller 3 sets the target vehicle speed Vo and the actual vehicle speed V.
It is determined whether or not the deviation ΔV (= Vo−V) from and is larger than a predetermined value ΔV _CS1 . That is, it is determined whether or not the vehicle speed V has decreased from the target vehicle speed Vo by a predetermined value ΔV _CS1 (step S51). When the decrease in vehicle speed V is not large and is equal to or higher than the target vehicle speed Vo by the predetermined value ΔV _CS1 , the routine is ended without doing anything.

If the determination result of step S51 is affirmative, that is, for example, the target vehicle speed Vo cannot be maintained even when the throttle valve 6 is opened during climbing, and the vehicle speed V is lower than the target vehicle speed Vo by a predetermined value ΔV _CS1. If the vehicle speed V has decreased beyond this, it is determined whether or not the state in which the vehicle speed V has decreased below the target vehicle speed Vo by a predetermined value ΔV _CS1 and continued for a predetermined time t _CS1 (step S53). . If it has not continued for the predetermined time t _CS1 , the routine is terminated without doing anything, and the predetermined time t _CS
CS1 continues to execute 4-3 shift for the first time (step S55). Fig. 10 shows how the 4-3 shift is performed during the cruise. The actual vehicle speed V is ΔV greater than the target vehicle speed Vo.
_The 4-3 shift is executed for the first time at the time point t2 when the predetermined time _tCS1 has elapsed from the time point t1 when the vehicle speed has decreased by a small amount by _CS1 .

Returning to FIG. 3 again, if the determination result of step S30 is negative, that is, if the overdrive stage (OD) is not on,
If the speed is established, proceed to step S34
It is determined whether or not the shift down to the speed is performed by the above-described tap processing. If the downshift is performed by the tap processing, the process proceeds to step S60, and the 3-4 shift control at the time of the tap processing is performed.

FIG. 6 shows a flowchart of the 3-4 shift control at the time of tap processing. The controller 3 determines that the deviation ΔV between the target vehicle speed Vo and the actual vehicle speed V newly set by the tap processing is a predetermined value ΔV _TP2 ( For example, it is determined whether it has become smaller than 4 km / h). That is, it is determined whether or not the vehicle speed V approaches the target vehicle speed Vo within a predetermined value ΔV _TP2 (step S61). If the vehicle speed V has not approached the target vehicle speed Vo within the predetermined value ΔV _TP2 , the routine is ended without doing anything.

If the determination result of step S61 is affirmative, that is, the vehicle speed V
If but approaching within a predetermined value [Delta] V _TP2 with respect to the target vehicle speed Vo, the vehicle speed V is, the predetermined from the time of crossing the lower value by a predetermined value [Delta] V _TP2 than the target vehicle speed Vo time t _TP2 (e.g., 6
(Seconds) has elapsed (step S63). If not, the passage of a predetermined time t _TP2 is, nothing ends the routine without, for the first time the predetermined time t _TP2 has elapsed 3
Four shifts are executed (step S65). Figure 11 shows how 3-4 shift is performed during tap processing.
Time point t4 when a predetermined time t _TP2 elapses from time point t3 when the actual vehicle speed V rises across a vehicle speed that is smaller than the target vehicle speed Vo by ΔV _TP2
The 3-4 shift is executed for the first time (see FIG. 11 (b)).

Returning to FIG. 3, if the determination result of step S34 is negative, that is, if the downshift to the third speed is not performed by the tap processing described above, step S70
To execute 3-4 shift control during cruise.

FIG. 7 shows a flowchart of the 3-4 shift control during cruising, in which the controller 3 sets the target vehicle speed Vo and the actual vehicle speed V.
It is determined whether or not the deviation ΔV from the value is smaller than a predetermined value ΔV _CS2 (for example, 4 km / h). That is, the vehicle speed V is the target vehicle speed
It is determined whether or not Vo has come within a predetermined value ΔV _CS2 (step S71). If the vehicle speed V does not approach the target vehicle speed Vo within the predetermined value ΔV _CS2 , the routine is ended without doing anything.

When the determination result of step S71 is affirmative, that is, the vehicle speed V
When the vehicle speed V approaches the target vehicle speed Vo within a predetermined value ΔV _CS2 , the vehicle speed V crosses a value ΔV _CS2 lower than the target vehicle speed Vo for a predetermined time t _CS2 (this predetermined time
(t _CS2 is set to a value longer than the predetermined time t _TP2 of 3-4 shift control at the time of the tap processing described above, for example, 20 seconds).
It is determined whether or not has passed (step S73). If the predetermined time t _CS2 has not elapsed, the routine is ended without doing anything, and the 3-4 shift is executed only after the predetermined time t _CS2 has elapsed (step S75). Fig. 12 shows how 3-4 shifts are performed during a cruise. When the actual vehicle speed V rises across a vehicle speed that is ΔV _CS2 less than the target vehicle speed Vo, a time t _CS2 has elapsed from a time t5. At t6, the 3-4 shift is executed for the first time (see FIG. 12 (b)).

13 and 14 show that the target vehicle speed Vo is set to a high value by a predetermined value (3 km / h) by tapping the resume switch 8, but the shift control of the transmission 11 is different from that of the present invention. It is intended to explain the inconvenience that occurs because the control is not compatible. The shift control shown in these drawings is performed by the deviation ΔV between the target vehicle speed Vo and the actual vehicle speed V.
Is a predetermined value (2.5 km / h or more, a 4-3 shift is executed after waiting a predetermined time (1 sec) and the vehicle speed V is smaller than the target vehicle speed Vo by a predetermined value (1.25 km / h). When approaching to, the 3-4 shift is executed after waiting a predetermined time (20 seconds).

When such shift control is executed, the target vehicle speed Vo is
Even if the value is changed to a slightly larger value of about 3 km / h, an unnecessary 4-3 shift will be executed. To explain this in more detail, set the resume switch 8 to 2
When the target vehicle speed Vo is changed to a value larger by 3 km / h by tapping twice, the deviation ΔV between the target vehicle speed Vo and the actual vehicle speed V is the predetermined value (a predetermined time (1 sec) from the time t11 when the vehicle speed becomes 2.5 km / h or more).
4-3 shift is executed at a time point t12, and the actual vehicle speed V is a predetermined value (1.25 km /
A predetermined time (20 seconds) from time t13 when a value smaller than h) is crossed
Until the time t15 when is elapsed, the vehicle will be operated in the third gear. Moreover, if the deceleration tap operation is performed at time t14 before time t15 when the gear is shifted up from the third speed to the fourth speed, the vehicle speed V
Despite being decelerated, the vehicle will run in third gear. In this way, even if the target vehicle speed Vo is slightly changed, if the 4-3 shift and the 3-4 shift are executed, a shift shock occurs every time the tap processing is performed, which is not preferable.

On the other hand, FIGS. 15 and 16 show changes with time in the vehicle speed V and the like when the 4-3 shift control according to the present invention is executed. According to the present invention, a predetermined value ΔV _TP1 is provided and taps are performed. When the change amount of the target vehicle speed Vo due to the operation is a small change less than or equal to the predetermined value ΔV _TP1 , the 4-3 shift is not executed (No.
(See Fig. 15 (b)). 4 if the change in target vehicle speed Vo is small
It is possible to smoothly shift the vehicle speed V to the target vehicle speed Vo without changing the vehicle speed without performing downshifting from the third speed to the third speed (see FIG. 16).

17 and 18 show that the target vehicle speed Vo is set to a value higher by a predetermined value (7.5 km / h) by tapping the resume switch 8 five times, but the shift control of the transmission 11 is Unlike the invention, the inconvenience caused by the fact that the tap control is not adapted is described. The shift control in this case is also the same as that shown in FIGS. 13 and 14, and the timing of the 4-3 shift and the 3-4 shift is bad, so that the fluctuation of the vehicle speed V is large. Yes (see fluctuation shown in circle A in Figure 18). To explain this in more detail, if the resume switch 8 is tapped five times to change the target vehicle speed Vo to a value larger by 7.5 km / h,
The deviation ΔV between the target vehicle speed Vo and the actual vehicle speed V is the predetermined value (2.5 k
m / h) or more, a 4-3 shift is executed at a time t22 when a predetermined time (1 sec) elapses from a time t21, and the actual vehicle speed V is a predetermined value (1.25 km / h) from the newly set target vehicle speed Vo. A timer that counts a predetermined time (20 seconds) from a time point t23 when the value crosses only a small value is activated. However, after the time t24 when the vehicle speed V crosses the new target vehicle speed Vo, the third speed running is continued for a long period of time. Like the change control during cruise, the actual vehicle speed V fluctuates greatly in the vicinity of the new target vehicle speed Vo and the target vehicle speed Vo is changed by the tap operation in order to set the third speed travel period to be long. Vehicle speed Vo
When the actual vehicle speed that descends across the vehicle crosses a value that is smaller than the target vehicle speed Vo by a predetermined value (1.25 km / h),
At t25, the above-mentioned timer is reset, the timer restarts counting time again, and at time t27 when a predetermined time (20 seconds) elapses, the 3-4 shift is executed. Moreover,
When the deceleration tap processing is executed at time t26 before time t27 when the vehicle is shifted up from the third speed to the fourth speed, the vehicle travels in the third speed even though the vehicle speed V is in the decelerated state. In this way, if the vehicle is driven at the third speed for an unnecessarily long period, the vehicle speed fluctuation continues for a long period of time, and the driving feeling is deteriorated.

On the other hand, FIGS. 19 and 20 show changes with time of the vehicle speed V and the like when the 4-3 shift control according to the present invention is executed. According to the present invention, the target vehicle speed Vo is changed by tap operation. If the amount is larger than the predetermined value ΔV _TP1 , 4-3 shift is executed immediately and the set period t _CS2 (20 seconds) during the cruise.
After running the third speed for a shorter period t _TP2 (for example, 6 seconds), the 3-4 shift is executed. The deviation ΔV between the target vehicle speed Vo and the actual vehicle speed V caused by the tap processing is different from the deviation ΔV caused by, for example, climbing during the cruise.
In many cases, it is not necessary to shift down for a long time to increase the engine output. Therefore, the predetermined value ΔV _TP1 (4 km / h) in the 4-3 shift control of the present invention is the predetermined value (2.5 km) during the cruise.
The value is set to a value larger than km / h), and the predetermined period t _TP2 in the 3-4 shift control is also set shorter than the predetermined period t _CS2 during the cruise. Thus, the vehicle speed V at the time of tap processing
Changes very smoothly as shown in FIG.

(Effects of the Invention) As described in detail above, according to the vehicle constant speed traveling device of the present invention, the target value changing switch means is provided and the target vehicle speed is increased by the first predetermined value by one switch operation. It is preferable that the second target value change switch means is provided and the target vehicle speed is changed and set to a value lower by the fourth predetermined value by one switch operation. The target vehicle speed can be finely adjusted easily and surely. Further, a vehicle speed sensor for detecting the vehicle speed is provided, and when the deviation between the new target vehicle speed set by the switch operation of the target value change switch means and the actual vehicle speed is smaller than the second predetermined value, switching of the shift speed is prohibited. , The deviation between the new target vehicle speed and the actual vehicle speed detected by the vehicle speed sensor is the second
When the actual vehicle speed reaches a vehicle speed that is lower than the new target vehicle speed by a third predetermined value, the second shift speed is changed from the first speed step to the second speed step. Since the shift up from the first gear to the first gear is performed, the shift control suitable for the fine adjustment of the target vehicle speed by the target value changing switch means as described above can be performed, the shift shock is small, and the driving feeling is reduced. Can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a constant speed traveling device according to the present invention, FIG. 2 is a program flowchart of a target vehicle speed change processing routine executed by the controller 3 shown in FIG. 1, and FIG. , A program flowchart of a shift control routine which is also executed by the controller 3, FIG. 4 shows the details of step S40 in FIG. 3, and a program flowchart of 4-3 shift control during tap processing, FIG. The details of step S50 of FIG. 3 are shown, and the program flowchart of the 4-3 shift control during the cruise is shown. FIG. 6 is the details of step S60 of FIG. 3 and the program flowchart of the 3-4 shift control at the time of tap processing. , FIG. 7 shows the details of step S70 of FIG. 3, and shows a program flowchart of 3-4 shift control during cruise, FIG. 8 and FIG. Figure, 4 of the tap processing
-3 is a graph showing the changes over time of the actual vehicle speed V, the target vehicle speed Vo, and the ON / OFF signal of the overdrive stage (OD) by the shift control, and FIG. 10 is the actual vehicle speed V, the target by the 4-3 shift control during the cruise. Vehicle speed Vo and overdrive stage (OD)
Fig. 11 is a graph showing the change over time of the on / off signal of
Fig. 12 is a graph showing changes over time of the actual vehicle speed V, the target vehicle speed Vo, and the on / off signal of the overdrive stage (OD) by the 3-4 shift control during tap processing.
Graphs showing the changes over time of the actual vehicle speed V, the target vehicle speed Vo, and the ON / OFF signal of the overdrive stage (OD) by 4-shift control, FIGS. 13 and 14 are target vehicle speeds obtained by tap processing.
When Vo is changed to a slightly larger value, the same shift control as during cruise is applied to shift 3-4 and 4-3.
In the figure for explaining the inconvenience when executing the shift,
FIG. 13 is a graph showing the changes over time of the actual vehicle speed V, the target vehicle speed Vo, and the ON / OFF signal of the overdrive stage (OD).
FIG. 14 is a graph showing the time change of the actual vehicle speed V and the throttle valve opening, and FIGS. 15 and 16 are adapted to the tap processing when the target vehicle speed Vo is changed to a slightly larger value by the tap processing. FIG. 15 is a diagram for explaining the shift control to be performed. In FIG. 15, the actual vehicle speed V, the target vehicle speed Vo, and the overdrive stage (O
FIG. 16 is a graph showing the changes over time of the on / off signal of D), FIG. 16 is a graph showing the changes over time of the actual vehicle speed V and the throttle valve opening, and FIGS. 17 and 18 are the target vehicle speeds by tap processing.
When changing Vo to a value exceeding a predetermined value ΔV _TP1 , a shift control similar to that during cruise is applied to execute inconvenience when 3-4 shift and 4-3 shift are executed. FIG. 17 is a graph showing the changes over time of the actual vehicle speed V, the target vehicle speed Vo, and the on / off signal of the overdrive stage (OD), and FIG. 18 is a graph showing the changes over time of the actual vehicle speed V and the throttle valve opening. , FIG. 19 and FIG. 20 are diagrams for explaining the shift control adapted to the tap processing when the target vehicle speed Vo is changed to a value exceeding the predetermined value ΔV _TP1 by the tap processing, and FIG. , The actual vehicle speed V, the target vehicle speed Vo, and the on-off signal of the overdrive stage (OD) with time, and FIG. 20 is a graph showing the actual vehicle speed V and the time variation of the throttle valve opening. 2 ... Set switch (target value change switch means), 3
...... Controller, 4 ...... Vehicle speed sensor, 5 ...... Throttle drive circuit, 6 ...... Throttle valve, 8 ...... Resume switch (target value change switch means), 10 ...... Internal combustion engine, 11 ...... Automatic transmission, 14 ...... Throttle valve opening sensor, 15 ...... Hydraulic control circuit.

Claims (3)

[Claims] 1. At least a first speed change step for obtaining a higher vehicle speed at the same engine speed and a second speed change step for obtaining a lower vehicle speed, the first speed change step depending on a driving state of the vehicle. A vehicle speed sensor for detecting a vehicle speed in a constant speed traveling device that adjusts the output of an engine mounted in a vehicle including an automatic transmission that switches between a first gear and a second gear and maintains the vehicle speed near a target vehicle speed. And target value changing switch means for changing and setting the target vehicle speed to a value higher by a first predetermined value by one switch operation, and new target vehicle speed and actual vehicle speed set by the switch operation of the target value changing switch means. When the deviation between the new target vehicle speed and the actual vehicle speed detected by the vehicle speed sensor is larger than the second predetermined value, the shift of the shift speed is prohibited. 1 When the actual speed reaches a vehicle speed lower than the new target vehicle speed by a third predetermined value, the second speed is switched to the first speed, and the second speed is switched to the first speed. Constant-speed traveling device for a vehicle. 2. The vehicle according to claim 1, further comprising second target value change switch means for changing and setting the target vehicle speed to a value lower by a fourth predetermined value by one switch operation. Constant-speed traveling device. 3. When the actual vehicle speed detected by the vehicle speed sensor reaches a vehicle speed which is lower than a new target vehicle speed set by a switch operation of the target value changing switch means by a third predetermined value, a predetermined time has elapsed. 2. The constant-speed traveling device for a vehicle according to claim 1, wherein the second speed is switched to the first speed after waiting for.