JPH062825Y2 - Constant speed traveling device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a constant-speed traveling device that sets a traveling speed of an automobile to a constant value.

2. Description of the Related Art When a vehicle can travel at a constant speed while the vehicle is running, the vehicle is configured to achieve a constant speed running at a desired speed without operating the accelerator pedal of the driver. Conventionally, a constant speed traveling device has been used.
In such a constant speed traveling device, normally, for safety, an upper limit of a set constant speed traveling speed is provided,
At a traveling speed exceeding the upper limit, it is configured such that constant speed traveling cannot be set. For example, in vehicles for Japan, the upper limit of the legal speed limit is 100 km / h, and therefore the upper limit of the settable constant speed is set to 105 to 110 km / h with some allowance. There is.

Problems to be solved by the invention Lower the upper limit of the constant speed that can be set (for example, 150
(km / h), even if the driver tries to set the constant speed running speed to about 100 km / h, for example ± 5%
That is, when the error of the speedometer of about 5 km / h and the reading error of the driver of about ± 5% overlap, the setting may not be accepted. Further, when the upper limit of the constant speed traveling speed is set to a high value (for example, 110 km / h), it is possible to set the constant speed traveling at a speed near 100 km / h even if the above two errors overlap. However, even if the upper limit of the legal speed limit (100 km / h) is exceeded by, for example, 10 km / h, it becomes possible to set the constant speed traveling.

An object of the present invention is to provide a constant speed traveling device that can reliably set a constant speed traveling speed within a settable range.

Means for Solving the Problems The present invention includes a first storage means for storing a first speed limit corresponding to an upper limit speed at which constant speed running is possible, and a value higher than the first speed limit. A second storage unit for storing a second speed limit at which a constant speed traveling setting operation is possible, wherein the first storage is performed for the setting operation at a traveling speed equal to or lower than the second speed limit and equal to or higher than the first speed limit. It is a constant-speed traveling device characterized in that the stored contents of the means are read out to obtain the traveling speed.

According to the present invention, in the constant speed traveling device for controlling the actuator or the like provided in association with the throttle valve so as to maintain the traveling speed set by the driver's setting operation, the first and second Two storage means are provided. The stomach 1 storage means corresponds to the upper limit speed at which constant speed running is possible, that is, 100 km / h, which is the upper limit of the legal speed.
Is stored. Further, the second storage means stores a second speed limit that is higher than the first speed limit and that allows a constant speed travel setting operation.

In the constant-speed traveling device configured as described above, when the traveling speed is less than the first speed limit when the traveling speed is set, the setting of the traveling speed as it is is allowed, while the second speed limit is set. Setting is prohibited when the speed is exceeded. When the speed is equal to or higher than the first speed limit but equal to or lower than the second speed limit, the first speed limit stored in the first storage unit is set to the traveling speed.

As a result, even if the setting is performed in the vicinity of the second speed limit, which is determined in consideration of the error of the speedometer instruction, the error of the driver reading the speedometer, and the like, the actually set traveling speed is the first speed. The speed limit is limited to 1, and thus it is possible to reliably set the speed within the first speed limit.

Embodiment FIG. 1 is a block diagram showing the basic configuration of a constant speed traveling device 1 which is an embodiment of the present invention. The output of the vehicle speed sensor 2 that generates a pulse having a frequency corresponding to the wheel rotation speed and detects the vehicle body speed is given to a frequency / voltage (hereinafter abbreviated as F / V) conversion circuit 3 and the vehicle speed sensor 2 Is converted into a voltage corresponding to the frequency of the generated pulse. F
The output of the / V conversion circuit 3 is applied to the non-inverting input terminal of the subtracter 4 and also applied to the non-inverting input terminals 6a, 7a, 8a of the comparators 6, 7, 8 via the line 5. . The inverting input terminal 6b of the comparator 6 has a vehicle speed of 110 km from the second memory 9 which is the second memory means.
A voltage corresponding to the output of the F / V conversion circuit 3 when / h is applied. Further, the inverting input terminal 7b of the comparator 7 has a first
A voltage corresponding to the output of the F / V conversion circuit 3 when the vehicle body speed is 100 km / h is given from the first storage device 10 which is a storage means. Further, the inverting input terminal 8 of the comparator 8
In b, from the third storage unit 11, for example, the vehicle speed is 40
A voltage corresponding to the output of the F / V conversion circuit 3 at the time of km / h is given.

The comparators 6, 7 and 8 have non-inverting input terminals 6a and 7 respectively.
a, 8a is applied to the inverting input terminals 6b, 7
b or 8b, a high level signal is output to the output terminals 6c, 7c and 8c when the voltage is higher than the voltage applied to the output terminals b and 8b, and a low level signal is output when the voltage is lower than the voltage applied to the inverting input terminals 6b, 7b and 8b. 7c, 8c.

The output of the comparator 6 is one input terminal 1 of the NOR circuit 12.
2a and an exclusive OR (hereinafter abbreviated as EX-OR) circuit 13 are applied to one input terminal 13a. The other input terminal 12b of the NOR circuit 12 is provided with the output of the comparator 8 via the inverting circuit 14, and the other input terminal 13b of the EX-OR circuit 13 is provided with the output of the comparator 7.
The output of the comparator 7 is further given to one input terminal 15a of the EX-OR circuit 15, and the output of the comparator 8 is given to the other input terminal 15b of the EX-OR circuit 15.

The output of the NOR circuit 12 is given to one input terminal 16a of the AND circuit 16. Further, the output of the EX-OR circuit 13 is given to the switch circuit 17, and the output of the EX-OR circuit 15 is given to the switch circuit 18, so that the switch circuit 1
The conduction / interruption of 7, 18 is controlled. The other input terminal 16b of the AND circuit 16 is provided in the vicinity of the driver's seat in the passenger compartment of the automobile, and is operated by the operator when the vehicle body speed reaches a desired value for constant speed traveling, so that constant speed traveling is performed. A signal from the setting switch 19 for instructing the speed setting is given. The setting switch 19 outputs a high level signal for a certain period when operated by an operator. A
The output of the ND circuit 16 is given to a set input terminal S of a switch circuit 20 and a reset / set flip-flop (hereinafter abbreviated as FF) 25.

The switch circuit 20 has input terminals T1 and T2 and output terminals T3 and T4, and the input terminal T1 is a line 2 connecting the F / V conversion circuit 3 and the non-inverting input terminal of the subtractor 4.
1 and the output of the first memory 10 is supplied to the input terminal T2. The output terminal T3 is connected to the input terminal T5 of the switch circuit 18, and the output terminal T4 is the switch circuit 1
7 is connected to the input terminal T6. Switch circuit 17, 1
8 output terminals T8 and T7 are both read /
It is connected to a writable memory 22. The output of the memory 22 is given to the inverting input terminal of the subtractor 4. Memory 22
Stores the voltage level applied from the output terminal T7 or the output terminal T8 and outputs the voltage of the voltage level.

Between the input terminal T1 and the output terminal T3 of the switch circuit 20 and between the input terminal T2 and the output terminal T4 are simultaneously conducted when the output of the AND circuit 16 is at a high level, and are simultaneously shut off when the output of the AND circuit 16 is at a low level. . Switch circuit 18
The input terminal T5 and the output terminal T7 are electrically connected when the output of the EX-OR circuit 15 is at a high level, and are disconnected when the output is at a low level. Input terminal T6 of switch circuit 17
Similarly, between the output terminal T8 and the output terminal T8 is conducted / cut off when the output of the EX-OR circuit 13 is at high level / low level.

The output of the subtractor 4 is supplied to the duty conversion circuit 23 and converted into a duty signal for controlling the duty of a throttle valve control device (not shown), whereby the throttle valve control device outputs the output of the subtractor 4 to zero. It is controlled in the direction.

The output of the duty conversion circuit 23 is given to one input terminal 24a of the AND circuit 24. The other input terminal 24b of the AND circuit 24 is connected to the line 27 that connects the output terminal Q of the FF 25 and the inverting circuit 26. The output of the AND circuit 24 is given to a drive device 28 that drives the throttle valve control device.

The reset input terminal R of the FF 25 is provided with an output of a release switch 29 provided near the driver's seat in the passenger compartment of the automobile to release the constant speed traveling control by the constant speed traveling device 1. The output terminal Q of the FF 25 is given to the inverting circuit 26 via the line 27, and in the inverting circuit 26, F
The output of F25 is inverted and given to the releasing device 30 which releases the constant speed traveling.

A trigger pulse is applied to the set input terminal S and the reset input terminal R of the FF 25 from the AND circuit 16 and the release switch 29, respectively. When a trigger pulse is applied to the set input terminal S, the signal output to the output terminal Q is low. When the level is inverted from the high level and the trigger pulse is applied to the reset input terminal R, the signal output to the output terminal Q is inverted from the high level to the low level.

FIG. 2 is a timing chart for explaining the operation of the constant speed traveling device 1. 2 (1) shows changes in the vehicle body speed Vn, and FIG. 2 (2) shows the EX-OR circuit 15
2 (3) shows the output of the EX-OR circuit 13, and FIG. 2 (4) shows the output of the NOR circuit 12. 2 (5) shows the output of the setting switch 19, FIG. 2 (6) shows the output of the release switch 29, FIG. 2 (7) shows the output of the AND circuit 16, and FIG. ) Indicates the output signal of the FF 25.

Further, FIG. 2 (9) shows the state of the switch circuit 20 as
The state of the switch circuit 18 is shown in FIG.
1) shows the states of the switch circuit 17, respectively,
2 (12) shows the output state corresponding to the vehicle body speed Vn of the F / V conversion circuit 3, and FIG. 2 (13) shows the content Vm held in the memory 22.

When the vehicle is accelerated by the operator and the vehicle body speed Vn exceeds 40 km / h at time t1, the signal output to the output terminal 8c of the comparator 8 becomes high level. At this time, the outputs of the comparators 6 and 7 are all at the low level, and therefore the output of the EX-OR circuit 15 is at the high level.
The output of the -OR circuit 13 is at a low level, and a low level signal is applied to both the input terminals 12a and 12b of the NOR circuit 12, so that the output of the NOR circuit 12 is at a high level. Therefore, the switch circuit 18
The input terminal T5 and the output terminal T7 are electrically connected, and the input terminal T6 and the output terminal T8 of the switch circuit 17 are disconnected. Further, since the output of the NOR circuit 12 is at a high level, a high level signal is given to the input terminal 16a of the AND circuit 16 and a signal given to the other input terminal 16b of the AND circuit 16, that is, the setting switch 19a. When the output of becomes high level, the AND circuit 16
Outputs a high-level signal, whereby conduction is established between the input terminals T1 and T3 and between the input terminals T2 and T4 of the switch circuit 20, and FF2
The output of 5 is inverted from low level to high level. That is, the output of the F / V conversion circuit 3 is given to the storage device 22 by operating the setting circuit 19, and therefore, at time t1, the setting of constant speed running is possible.

When the setting switch 19 is operated by the operator at time t2, the setting switch 19 outputs a high level signal for a predetermined fixed period Δ1. As a result, electrical connection is established between the input terminal T1 and the output terminal T3 of the switch circuit 20 and between the input terminal T2 and the output terminal T4 during the period Δ1 from the time t2, which causes the vehicle body speed Vn (for example, 60 km / h) at the time t2. ) Corresponding to F /
The voltage level of the output voltage of the V conversion circuit 3 is held in the memory device 22, and a voltage having a voltage level equal to the voltage level is applied to the inverting input terminal of the subtractor 4. The output of the FF 25 goes high in synchronization with the rise of the output of the setting switch 19. As a result, a high level signal is given to the input terminal 24b of the AND circuit 24, so that A
The ND circuit 24 supplies the drive device 28 with a pulse having the same period as the pulse supplied from the duty conversion circuit 23 to the input terminal 24a. The output of the subtractor 4 after the time t2 corresponds to the difference between the output voltage of the memory 22 (corresponding to 60 km / h) and the output voltage of the F / V conversion circuit 3, whereby the duty conversion circuit 23 Generates a pulse that makes the output of the subtractor 4 zero. In this way, for example, constant speed traveling at a vehicle body speed of 60 km / h is realized without the driver's operation of an accelerator pedal (not shown).

When the release switch 29 is operated by the operator at time t3, the release switch 29 derives a high level signal during a predetermined period Δ2 from time t3. The signal led to the output terminal Q of the FF 25 is inverted to the low level in synchronization with the rise of the output signal of the release switch 29, whereby the output of the AND circuit 24 is at the low level regardless of the output of the duty conversion circuit 23. As a result, the drive device 28 is deactivated. Further, the releasing device 30 is activated by being given a high level signal from the inverting circuit 26, and the constant speed traveling control is released. Therefore, after the time t3, the vehicle body speed Vn is changed by the driver's operation of the accelerator pedal.

At time t4, when the vehicle speed Vn exceeds 100 km / h, the output of the comparator 7 changes to high level, which changes the output of the EX-OR circuit 15 to low level, and E
The output of the X-OR circuit 13 changes to high level. As a result, the input terminal T5 and the output terminal T of the switch circuit 18 are
7, and the input terminal T6 of the switch circuit 17 is cut off.
Is electrically connected to the output terminal T8. The output of the NOR circuit 12 is at a high level because the output of the comparator 6 is at a low level and the output of the comparator 8 is at a high level. Therefore, a high level signal is output to the input terminal 16a of the AND circuit 16. Has been given. Setting switch 1 in this state
When 9 is operated, the output of the first storage device 10 changes to the storage device 22.
Will be given to and retained by.

When the setting switch 19 is operated by the operator at the time t5, the setting switch 19 moves from the time t5 to the period Δ.
While at 1, a high level signal is derived. This makes AN
The D circuit 16 outputs a high level signal from time t5 over the period Δ1, and in the switch circuit 20 from time t5 between the input terminal T1 and the output terminal T3 and between the input terminal T2 and the output terminal T4. It conducts for a period Δ1, so that the first memory 1 is stored in the memory 22.
When the vehicle speed Vn is 0 to 100 km / h, the voltage level output from the F / V conversion circuit 3 is given and held. At time t5, the signal derived at the output terminal Q of the FF 25 is inverted to a high level, the AND circuit 24 outputs a signal corresponding to the pulse output from the duty conversion circuit 23, the drive device 28 is driven, and the vehicle body is driven. Speed Vn
Gradually decreases and stabilizes at 100 km / h.

When the release switch 29 is operated at time t6, F
The signal led to the output terminal Q of F25 is inverted to a low level, whereby the output of the AND circuit 24 becomes a low level regardless of the output of the duty conversion circuit 23, so that the drive device 28 becomes inactive. Further, since the output of the inverting circuit 26 becomes high level, the releasing device 30 is activated and the constant speed traveling control state by the constant speed traveling device 1 is released.

When the driver operates the accelerator pedal to accelerate the vehicle and the vehicle body speed Vn thereof exceeds 110 km / h at time t7, the signal delivered to the output terminal 6c of the comparator 6 changes from low level to high level. . This makes EX-O
The output of the R circuit 13 changes from high level to low level, and the output of the NOR circuit 12 changes from high level to low level. Therefore, in the switch circuit 17, the connection between the input terminal T6 and the output terminal T8 is cut off, and AN
Since a low level signal is given to the input terminal 16a of the D circuit 16, its output becomes low level regardless of the output of the setting switch 19 and the input terminal T1 and the output terminal T3.
There is no electrical connection between the input terminal T2 and the output terminal T4. Also, set input terminal S of FF25
Is not given a high level signal.

Even if the setting switch 19 is operated at time t8, FF
The signal output to the output terminal Q of 25 remains at the low level because the output of the AND circuit 16 is at the low level. Therefore, the output of the AND circuit 24 is at the low level regardless of the output of the duty conversion circuit 23, and the constant speed traveling control is not performed. That is, at time t8, it is not possible to set constant speed running.

The vehicle body speed Vn is 4 before the time t1.
Since it is less than 0 km / h, the outputs of the comparators 6, 7 and 8 are all at the low level, and therefore the EX-OR circuit 1
The outputs of the circuits 3, 15 and the NOR circuit 12 are all at a low level, and constant-speed traveling cannot be set in the period before time t1.

That is, the vehicle speed Vn is set to 40 to 11 when the vehicle is traveling at a constant speed.
It is possible at 0 km / h and the vehicle speed Vn is 40 to 100 km.
In the range of / h, the vehicle body speed Vn at the time when the setting switch 19 is operated is the vehicle body speed during constant speed running, and is 100 to 1
In the range of 10 km / h, the vehicle speed is 100 km during constant speed driving.
/ h

FIG. 3 is a flowchart for explaining the operation of the constant speed traveling device 1. In step n1, it is determined whether the setting switch 19 has been operated. When the setting switch 19 is operated, the process proceeds to step n2 and the vehicle speed V
It is determined whether n (km / h) satisfies 40 ≦ Vn ≦ 100 (1). When the above equation 1 is satisfied, the process proceeds to step n3, where the vehicle body speed Vn is stored in the storage unit 2.
The stored content Vm is 0. This post-processing is step n4.
Then, the constant speed traveling control is performed based on the output of the subtractor 4. In step n5, it is determined whether or not the release switch 29 has been operated. If not, the process of step n4, that is, the constant speed traveling control is continued, and when operated, the release device 30 activates the constant speed traveling control state. It is canceled by being done.

In step n2, when the first expression is not satisfied, the process proceeds to step n6, and it is determined whether or not the vehicle body speed Vn (km / h) satisfies 100 <Vn ≦ 110 (2). When the second expression is satisfied, the process proceeds to step n7, and the stored content Vm of the storage device 22 is
Is the content corresponding to 100 km / h, and the process proceeds to step n4.

When the second equation is not satisfied in step n6, that is, when the vehicle body speed Vn (km / h) is Vn <40 (3) or Vn> 110 (4), the process proceeds to step n8 to set the constant speed running. Is prohibited. That is, the drive device 28 is in the inactive state regardless of the operation of the setting switch 19.

As described above, in this embodiment, when the vehicle body speed Vn satisfies the second expression, the vehicle body speed during constant speed traveling is 10
It is set to 0 km / h. This results in a vehicle speed of 100 km
It is possible to set constant speed running at / h, and it will not be possible to set constant speed running at a vehicle speed exceeding this.

In the above-mentioned embodiment, the high speed side of the range (40 km / h to 100 km / h) in which the constant speed traveling can be set has been described as an example, but the present invention can be applied to the low speed side. In that case, for example, when the vehicle speed is 30 km / h to 40 km / h and the setting operation of constant speed running is performed, the vehicle speed during constant speed running may be set to 40 km / h.

Effects As described above, according to the present invention, when the traveling speed is set at the first speed limit or higher, which is the upper limit speed at which constant speed travel is possible, when the traveling speed is set at the second speed limit or lower, the constant speed travel is performed. Since the traveling speed for setting is set to the first speed limit, the margin between the second speed limit enabling the setting operation and the first speed limit should be set relatively large. Even if there is an error in the speedometer or an error in reading by the driver of the speedometer, the setting can be reliably performed, and convenience and safety can be significantly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the basic configuration of a constant speed traveling device 1 according to an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of the constant speed traveling device 1, and FIG. 3 is a flowchart showing an operation of the constant speed traveling device 1. DESCRIPTION OF SYMBOLS 1 ... Constant speed traveling device, 9 ... 2nd memory | storage device, 10 ... 1st memory | storage device, 11 ... 3rd memory | storage device, 12 ... NOR circuit, 13, 15
... EX-OR circuit, 16, 24 ... AND circuit, 17,1
8, 20 ... Switch circuit, 19 ... Setting switch, 22 ...
Storage device, 25 ... FF, 29 ... Release switch.

Claims (1)

[Scope of utility model registration request] 1. A first storage means for storing a first speed limit corresponding to an upper limit speed at which constant speed travel is possible, and a value higher than the first speed limit, which allows a constant speed travel setting operation. A second storage means for storing a second speed limit, and when setting operation at a traveling speed equal to or lower than the second speed limit and equal to or higher than the first speed limit, the stored contents of the first storage means are read to drive the vehicle. A constant-speed traveling device characterized by being set to speed.