JPH051182B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a constant speed traveling device that stores the speed of a vehicle and automatically maintains the vehicle at the memorized speed. This invention relates to a constant speed driving device that can detect an abnormality in a switch that instructs to enter high speed driving.

[Prior Art] Generally, when pressed, a set switch of a constant speed running device memorizes the current running vehicle speed and starts constant speed running control, and a resume switch is used to resume constant speed running control once released. , the vehicle is restarted at the stored constant speed control vehicle speed. Further, to explain the functions of the set switch and the resume switch in detail, the electronic control circuit detects when the set switch is turned on, prepares a storage means for storing the current traveling vehicle speed, detects when the set switch is turned off, and stores the current traveling vehicle speed. is memorized and constant speed driving control is started. Also, when it detects that the resume switch is on, it will resume constant speed driving control or
Alternatively, if the on time is longer than a predetermined value, acceleration control is entered while the resume switch is on. When it detects that the resume switch is off after entering acceleration control, the vehicle speed at this time is memorized and constant speed driving control is started.

[Problems to be Solved by the Invention] However, if the set switch or the resume switch is short-circuited before the engine starts, the following situation can be expected.

First, when the set switch is short-circuited, control is entered to prepare the storage means for storing the current traveling vehicle speed, and this state continues. However, once the short-circuit of the set switch is released after the vehicle has entered the driving state, the current speed of the vehicle at that time will be memorized and constant speed driving control will be started. There is a possibility that it will start running. Furthermore, if the resume switch is short-circuited, acceleration control is entered, which may cause unexpected acceleration.

In the 1980s, Japanese Patent Application Publication No. 1987-11 was developed to develop technology that takes this type of problem into consideration.
Publication No. 1032 discloses that when at least one of the brake or the clutch is operated multiple times while the set signal from the set switch continues, a cancel means of the controller cancels the control according to the set signal, and the control according to the set signal is canceled. Even if the button breaks down and is kept pressed,
A technique has been disclosed that does not cause the dangerous situation described above.

However, with the technology published in the above publication, when the set switch remains on due to a failure, the set signal continues, and when the engine is started and the vehicle starts driving, the vehicle is accelerated regardless of the driver's intention. In addition, in order to cancel it, at least one of the brake and the clutch must be operated multiple times, which may result in unpredictable control for the driver. Further, in such a case, if the driver does not understand that if the brake or clutch is applied multiple times, it will be canceled, it will be difficult to avoid this, and the system is not suitable for practical use.

Therefore, in order to solve the above-mentioned problem, the present invention aims to prevent the driver from entering an unexpected constant speed driving state or acceleration state when the switch involved in the control of the constant speed driving device is in the on state and there is a short circuit. The object of this invention is to provide a constant speed traveling device that does not enter the vehicle.

[Means for Solving the Problems] The constant speed traveling device according to the present invention includes a switch involved in constant speed traveling control, a memory vehicle speed and a current vehicle speed of a storage means for storing a predetermined vehicle speed for constant speed traveling. In a constant speed traveling device equipped with an electronic control means for controlling an actuator means that controls the opening and closing of a throttle valve in a direction to eliminate the vehicle speed deviation, the low speed is the low limit of the speed at which constant speed traveling control is possible. When the speed is below the limit speed, it is determined whether the switch involved in the constant speed driving control is in the on state, and when the switch involved in the constant speed driving control is in the on state, the on state is temporarily canceled even if the low speed limit speed is exceeded. The state of the switch is not determined until the vehicle is turned on, and the constant speed running control state is not entered.

[Function] The electronic control circuit determines the ON state of the switch involved in the constant speed cruise control at a speed below a predetermined set speed, for example, below a low speed limit speed that is the low speed limit of the speed at which constant speed cruise control is possible. , when the switch involved in the constant speed driving control is in the on state, even if the low speed limit speed is exceeded, the switch state is not judged until the on state is once canceled, and the constant speed driving control including the acceleration control state is performed. This is to prevent this from happening.

Therefore, if a short circuit occurs in a switch involved in constant speed driving, such as a set switch, a resume switch, or an accelerator switch, before starting constant speed driving at a predetermined driving speed or higher, the above-mentioned Since it does not accept control signals from switches involved in constant-speed driving, such as the set switch and resume switch, even if a short circuit occurs in the switch before the vehicle starts constant-speed driving, unexpected acceleration may cause the vehicle to stop driving at constant-speed. can be prevented from entering the state.

[Example] Hereinafter, an example showing a specific example of the above technical means will be described.

FIG. 1 shows an overall configuration diagram of a constant speed traveling device according to an embodiment of the present invention.

In this configuration, the electronic control circuit CPU is composed of a single-chip microcomputer, and the reed switch SW2, which detects the vehicle speed signal,
The outputs of a clutch switch SW3, which detects depression of a clutch (not shown), and a brake switch SW6, which detects depression of a brake (not shown), are input. Similarly, the outputs of the set switch SW4 and the resume switch SW5 are input. In addition, the vacuum pump BP generates negative pressure that operates the negative pressure actuator AC that controls the opening of the throttle valve SV, and the vacuum switch SW installed in the surge tank ST stores the negative pressure.
The output of 7 is input.

Here, the resume switch SW5 restarts the once-released constant speed driving control at the stored controlled vehicle speed, and also controls the clutch switch SW5.
SW3 and brake switch SW6 are constant speed driving control release switch means.

Near reed switch SW2, there is a permanent magnet connected to the speedometer cable (not shown).
When the permanent magnet PM rotates as the vehicle moves, the contacts of the reed switch SW2 open and close, and a pulse (vehicle speed signal) with a frequency proportional to the vehicle speed is sent to the electronic control circuit CPU.

Clutch switch SW3 opens and closes in conjunction with the vehicle's clutch pedal, and brake switch SW6
opens and closes in conjunction with the vehicle's brake pedal. A stop lamp L is connected to the brake switch SW6, and the stop lamp L lights up when the brake switch SW6 is turned on (closed).

Set switch SW4 and resume switch
SW5 is a push button switch and is placed at a position that is easy for the driver to operate. By pressing the set switch SW4, the vehicle speed is memorized, constant speed driving control is started, and the brake switch is pressed.
Constant speed driving is canceled by pressing SW6, but the memorized vehicle speed remains. When the resume switch SW5 is pressed, constant speed driving control is started at the memorized vehicle speed before constant speed driving is canceled.

In addition, brake switch SW6 has fuse F.
Power is supplied to the electronic control circuit CPU through the power switch SW1.

The output of the electronic control circuit CPU is to drive the solenoid of a control valve V1 that controls a negative pressure actuator AC, which will be described later, via a drive circuit D1, the solenoid of a vent valve V2 via a drive circuit D2, and the solenoid of a release valve V3. They are connected to each other via circuit D3. It is connected to the motor of the vacuum pump BP and the like via a drive circuit D4.

The negative pressure actuator AC is constructed and operates as follows.

The negative pressure actuator AC constitutes a negative pressure chamber A1 sealed by a diaphragm A4 disposed within the housing A5, and the opposite side of the diaphragm A4 is an atmospheric side A2. Said diaphragm A4
is energized by a compression coil spring A3 disposed on the negative pressure chamber A1 side. Note that the diaphragm A4 is the valve B2 of the throttle valve SV.
A throttle rod B1 that opens and closes the valve is connected to the throttle rod B1.

Further, the negative pressure chamber A of the negative pressure actuator AC
1, the negative pressure of the surge tank ST is introduced through a control valve V1, a vent valve V2, and a release valve V3.

The control valve V1 sends the negative pressure of the surge tank ST to the negative pressure actuator AC side when the solenoid is in an energized state, and shuts it off when the solenoid is in a non-energized state. Furthermore, when the solenoid is in an energized state, the vent valve V2 sends the negative pressure sent from the control valve V1 side to the negative pressure actuator AC side, and when the solenoid is in a de-energized state, it sends out the negative pressure on the negative pressure actuator AC side. Emitted into the atmosphere. And release valve V3
When an abnormality occurs in the control system and proper control is no longer possible, the negative pressure chamber A of the negative pressure actuator AC
1 of the negative pressure is discharged into the atmosphere to bring the negative pressure chamber A1 to atmospheric pressure. At this time, the throttle valve SV is pushed back to the throttle rod B1,
Close valve B2. Usually release valve V3
The solenoid is energized and the vent valve V
2 and the negative pressure chamber A1 of the negative pressure actuator AC are in communication.

Control valve V1 and bend valve V2
The duty ratio is controlled by the electronic control circuit CPU. That is, during constant speed driving control,
The stored vehicle speed and the current vehicle speed are compared in the electronic control circuit CPU, and the duty ratio of the signal that excites the solenoids of the control valve V1 and vent valve V2 is determined so that the difference between them is equal. For example, when deceleration is required, the duty ratio is reduced, the proportion of time during which atmospheric air is communicated from the vent valve V2 to the negative pressure actuator AC is increased, and the throttle valve SV is closed by the diaphragm A4. Conversely, when acceleration is required, increase the duty ratio and use the negative pressure actuator.
Open throttle valve SV using AC.

Next, the operation of the microcomputer of the electronic control circuit CPU will be explained using flowcharts shown in FIGS. 2 to 12.

When the ignition switch is turned on and this program starts, the memory is initialized in step 1. At this time, the "standby state control flow" of the control state S=0 of the control state branch program is set. In step 2, each switch SW2~SW
Load the state of 7.

Step 3 is a branching step in which the control state S is determined and a processing function is selected accordingly.
That is, since this program is programmed to branch in response to each control state and function according to the branched program, the control state S is specified for each function, and the flow of each control state is Start processing.

Since the control state S=0 is set in step 1, the "standby state control flow" with S=0 is entered in step 3.

Control state S=0; "Standby state control flow" In this flow, the operating state of the resume switch SW5 is detected and the control system is put into a cancel state.

When entering this flow, first, in step 01, all valves, that is, the control valve V1, vent valve V2, and release valve V3, are turned off, and the control of the negative pressure actuator AC is stopped.
Stops constant speed driving control. And step 02
The operating state of the resume switch SW5 is detected. When it is on, check the memorized vehicle speed in step 03, and if the memorized vehicle speed is not 0 km/h (clear state), set the "full-on control flow" with control state S = 1 in step 04, and then set the vacuum control flow in step 05. Set the vacuum pump flag to activate the pump BP (set it to "H"). That is, preparations are made to enter the "full-on control flow" in the control state S=1.

Further, when the resume switch SW5 is not turned on or when the stored vehicle speed is 0 km/h (clear state), the control state S is not changed because the resume function is denied.

Control state S=1; "Full-on control flow" This flow is for performing prospective control in order to quickly drive the negative pressure actuator AC to a predetermined position. That is, in the "deceleration control flow" of control state S=4, the control valve V1 is off, the pressure in the negative pressure chamber A1 of the negative pressure actuator AC is decreasing, and the "standby control flow"
Now, since the actual constant speed running control is entered or after the "cancel control flow", the negative pressure in the negative pressure chamber A1 of the negative pressure actuator AC and the set speed do not match, so the speed is set as is. This is because even if the speed running control is restarted and the duty ratio of the control valve V1 is controlled, the predetermined throttle opening cannot be reached immediately. Therefore,
In step 11, it is determined whether this flow is entered for the first time, and when it is entered for the first time, all valves V1, V2, and V3 are turned on in step 12, and in step 13, it is set in advance to lengthen in proportion to the vehicle speed. Set full-on control time. After entering this flow in step 11 and setting the full-on control time, check the progress of the full-on control time set in step 14. When the full-on control time has elapsed, first, in step 15, the control valve V1 is turned off, and in step 16, the control state S=2 is set,
Enter the "constant speed control flow".

Control state S=2; "Constant speed control flow" This flow is a flow for performing constant speed driving at the stored vehicle speed. In step 201, the vehicle speed is obtained from the pulse of the reed switch SW2, and the duty ratio for opening and closing the control valve V1 and vent valve V2 is determined from the vehicle speed.

Steps 202 to 207 are steps when the vehicle speed cannot be controlled to the memorized vehicle speed for some reason in vehicle speed control using duty ratio control. First, at step 205, the vehicle speed deviation is 15km/h.
If the pressure becomes larger, the release valve V3 is turned off in step 206, the negative pressure in the negative pressure chamber A1 of the negative pressure actuator AC is reduced to equal atmospheric pressure, and the control of the throttle valve SV is released. and,
In step 207, the buzzer is turned on to notify the user. When the vehicle speed deviation becomes smaller than 10 km/h, the release valve V3 is turned on in step 203, the buzzer is turned off in step 204, and the duty ratio control of the control valve V1 and vent valve V2 is effectively activated in step 208. It becomes possible to control the vehicle to run at a constant speed. At this time, the vehicle speed deviation in step 202 is accelerated from 10 km/h to 15 km/h in step 205, and the vehicle speed deviation in step 202 is increased from 15 km/h to 10 km/h. While the speed is being decelerated to 1, there is a hysteresis of the set value at which control of the negative pressure actuator AC is restarted.

When the resume switch SW5 is turned on for a predetermined period of time (here, 0.5 seconds) in step 209,
At step 210, "acceleration control flow" with control state S=3 is set. Then, when the set switch SW4 is turned on in step 211, the "deceleration control flow" of control state S=4 is set in step 212. When the clutch switch SW3 is turned on in step 213, it is determined in step 214 whether the control state is S=1 or S=2. In other words, since clutch switch SW3 has a resume function, "acceleration control flow" or "deceleration control flow"
Determine whether you entered this flow from
If this flow is entered from either of the two flows, the "clutch resume control flow" with control state S=6 is set in step 215, and if not, the cancel function is set in step 216 when the clutch switch SW3 is turned on. control state S=5
``Cancel control flow'' is set. When the brake switch SW6 is turned on in step 217, a "cancel control flow" with control state S=5 is set in step 218.

Also, if the speed is lower than the set speed in step 219, for example,
The system determines whether the speed is below the low speed limit speed, which is the low speed limit for which constant speed driving control is possible, or the set speed, which is the low speed limit speed, which is the low speed limit for which constant speed driving control is possible. The set switch SW4 is turned on at step 220, and the volume switch SW5 is checked at step 221. When the set switch SW4 and the volume switch SW5 are turned on, the cancel state hold flag is set (set to "H") at step 223, and the control is performed at step 224. State S=
5 "cancellation control flow" is set. Set switch SW at step 220 and step 221
4 and resume switch SW5 are off,
At step 222, the cancel state retention flag is lowered (set to "L").

If the speed is not below the set speed in step 219, it is determined in step 225 whether the cancel state hold flag is set (“H”). If the cancel state hold flag is not set (“L”), the next step 229 is performed. Start processing. When the cancel state hold flag is set (“H”) in step 225, it is checked in step 226 whether the set switch SW4 is in the on state, and if it is in the on state, the “cancel control flow” in the control state S=5 is set in step 224. ' is set. When it is in the off state, it is checked in step 227 whether the resume switch SW5 is in the on state, and if it is in the on state, the "cancel control flow" with control state S=5 is similarly set in step 224. If the set switch SW4 and the resume switch SW5 are not on in steps 226 and 227, the cancel state retention flag is lowered (set to "L") in step 228.

Then, in steps 229 and 230, a low speed limit is determined, and if the current vehicle speed is less than a predetermined control vehicle speed, the control state S=7 is set, and constant speed driving control is prohibited. Then, in step 231, the process enters the "vacuum pump control subroutine".

Control state S=3; "Acceleration control flow" This flow is a flow for accelerating the vehicle during constant speed driving control and updating the constant speed driving speed. First, in step 31, all valves, that is, control valve V1, vent valve V2, and release valve V3, are turned on, and the negative pressure actuator is turned on.
Increase the negative pressure in the negative pressure chamber A1 of the AC, open the throttle valve SV, and turn off the resume switch in step 32.
It is accelerated until SW5 is turned off. When the resume switch SW5 is turned off, a "constant speed control flow" with control state S=2 is set in step 33, and the vehicle speed at that time is stored in the memory in step 34.

Control state S=4; "Deceleration control flow" This flow is a flow for decelerating the controlled vehicle speed during constant speed driving control and restarting constant speed driving control, and when set switch SW4 is turned on during constant speed driving control. Then, the control state becomes S=4, and this "deceleration control flow" is entered. In step 41, it is determined whether either clutch switch SW3 or brake switch SW6, which has a cancel function, is on, and if either one is on, all valves V1, V2, and V3 are turned off in step 42. The constant speed running control after entering the "deceleration control flow" is stopped. If neither clutch switch SW3 nor brake switch SW6 is turned on in step 41, step 43
control valve V1 and vent valve V2
Turn off, and turn on release valve V3. In this way, when the negative pressure supply to the negative pressure actuator AC is cut off, the throttle valve SV gradually closes.
The vehicle speed will gradually decrease. At step 44, it is detected that the set switch SW4 is off, and at step 45
The vehicle speed at the time the set switch SW4 was turned off is memorized. Then, in step 46, unless either clutch switch SW3 or brake switch SW6, which has a cancel function, is turned on and the vehicle exits constant speed driving control, the step will continue.
At step 48, set the control state S=1 and enter the "full-on control flow". In other words, deceleration control is controlled by the set switch.
This continues while SW4 is on, and resumes constant speed driving at the vehicle speed at the time the set switch SW4 is turned off. At step 46, clutch switch SW
3 or brake switch SW6 is turned on, the control state S=5 is set in step 47, and the "cancel control flow" is entered. and,
If the set switch SW4 is turned on in step 44, a vacuum pump flag is set (set to "H") in step 49.

Control state S=5; "Cancel control flow" This flow cancels constant speed driving control when clutch switch SW3 or brake switch SW6 is turned on during the "constant speed control flow" process of control state S=2. It is. When clutch switch SW3 or brake switch SW6, which has a cancel function, is turned on in step 51, the "standby state control flow" with control state S=0 is performed in step 52.
is selected, and in step 53 all valves V1, V2,
Turn V3 off.

Control state S=6; "Clutch regime control flow" In this flow, during the processing of "constant speed control flow" in control state S=2, clutch switch SW3 is turned on and the constant speed traveling control is temporarily released. This is the flow for entering constant speed driving control again. First, in step 61, all valves V1, V2, and V3 are turned off, and in step 62, the clutch switch SW is turned off.
3 is off, the step
At step 63, a "full-on control flow" with control state S=1 is entered.

Control state S=7; "Low speed limit control flow" This flow is for canceling and clearing the stored speed when the vehicle speed is lower than a predetermined speed in steps 219 and 220. step 71
Clear the memorized vehicle speed with Step 72 and set all valves to V.
1, V2, and V3 are turned off, and in step 73, the "standby state control flow" with control state S=0 is entered.

The above is an explanation of each control state flow.

And "Vacuum pump control subroutine"
is controlled as follows.

``Vacuum Pump Control Subroutine'' At step 231, the process of ``Vacuum Pump Control Subroutine'' begins. In step 81, determine whether the vacuum pump flag is set (“H”),
When the vacuum pump flag is set (“H”)
), the vacuum pump is turned off in step 83 until the time set in timer T1 elapses in step 82.
BP is activated. Timer T1 at step 82
When the set time has elapsed, the vacuum pump flag is lowered (set to "L") in step 84, and further,
At step 85, timer T1 is cleared. and,
If the vacuum pump flag is not set ("L") in step 81, it is determined in step 86 whether the vacuum switch flag is set ("H"), and if the vacuum switch flag is not set ("H"). (when it is "L"), it is checked in step 91 whether the vacuum switch SW7 is on. step 91
When the vacuum switch SW7 is not turned on, the vacuum pump BP is stopped in step 90. When it is determined in step 91 that the vacuum switch SW7 is on, a vacuum switch flag is set (set to "H") in step 92.

Once the vacuum switch flag is set at step 92 (becomes "H"), it is determined at step 86 that the vacuum switch flag is set (becomes "H"), and timer T2 is set at step 87.
In step 83, the vacuum pump BP is kept in operation until the set time elapses. When the set time of timer T2 has elapsed in step 87, step 88
Lower the vacuum switch flag (set it to "L") at step 89, clear timer T2 at step 89,
Stop the vacuum pump BP in step 90.

In the constant speed traveling device of the present invention which operates as described above, when the speed of the vehicle is below the predetermined set speed in steps 219 to 228 as described above,
Checking the set switch SW4 and the resume switch SW5 in step 221, if any switch involved in constant speed running control is on, the cancel state hold flag is set (set to "H") in step 223, and both constant speed When the switch involved in travel control is in the OFF state, the cancel state holding flag is lowered (set to "L") in step 222.

Then, when the speed of the vehicle exceeds a predetermined set speed, the state of the cancel state retention flag when the speed of the vehicle is below the predetermined set speed is changed.
If the cancel state hold flag is not set (“L”) as determined in step 225, the process enters the next step 229, performs the normal processing operation of the next step, and determines that the cancel state hold flag is set (“L”). "H"), if the switches involved in constant speed driving control, such as set switch SW4 and resume switch SW5, are still in the on state, the step
"Cancel control flow" with control state S=5 in 224
is set.

Therefore, when the switches involved in constant speed driving control, such as the set switch SW4 and the resume switch SW5, are in the ON state when the speed is below a predetermined set speed,
If the ON state continues even after exceeding the predetermined set speed, the electronic control circuit
When power is supplied to the CPU via the power switch SW1, if the switches involved in constant speed running control such as the set switch SW4 and the resume switch SW5 are short-circuited, or if the CPU reaches the predetermined set speed. When a short circuit occurs, those set switches will remain closed until the short circuit is removed.
4. The output of switches involved in constant speed driving control, such as resume switch SW5, is controlled by the electronic control circuit.
This is not an input to the CPU, and only the switch signals involved in constant speed driving control after the short circuit is released are input to the electronic control circuit CPU. Even if there is a short circuit in set switch SW4, the step
211 does not enter the "deceleration control flow" of control state S=4, and even if the short circuit is opened midway, the vehicle speed is memorized in step 44 and the control state S=2 is maintained.
can be prevented from entering the "constant speed control flow".

Therefore, the vehicle does not start running at a constant speed against the driver's will.

And the short circuit of resume switch SW5 is
Steps of “constant speed control flow” in control state S=2
If it is confirmed in step 209 that the on state continues for a predetermined time (here, 0.5 seconds), the control state S = 3 "acceleration control flow" is entered, and all valves are opened in step 31, but this is prevented. This prevents the vehicle from accelerating against the driver's will. Furthermore, if the short circuit is opened midway, the vehicle speed is stored in step 33 of the "acceleration control flow" in the control state S=3, and it is possible to prevent the vehicle from entering the "constant speed control flow" in the control state S=2. Therefore, there is no possibility that the vehicle will start running at a constant speed against the driver's will.

In addition, in the above embodiment, the switching can be determined by software depending on the processing method of the electronic control circuit CPU, so in the case where a microcomputer is used as the electronic control circuit CPU, the switch to enter constant speed control can be determined. There is no need to add an external circuit to determine if there is a short circuit.

In the embodiment of the constant speed traveling device of the present invention described above, the set switch SW4 and the resume switch SW5 are used as switches involved in constant speed traveling control. In the case where acceleration control is performed by turning on the set switch SW.
4. In addition to the resume switch SW5, the accelerator switch can also be included. Proactively, if the switch that enters acceleration control and constant speed control is targeted as a switch involved in constant speed driving control, it is possible to avoid acceleration control and constant speed control that are not intended by the driver. When carrying out the invention, it can be used for other switches such as deceleration control.

Furthermore, in the embodiment of the constant speed driving device of the present invention described above, when it is determined that a switch involved in constant speed driving control is short-circuited, acceleration control, constant speed control, deceleration control, etc. that are not intended by the driver are avoided. However, when carrying out the present invention, when it is determined in step 226 or step 227 that the set switch SW4 or the resume switch SW5 is on,
A display flag may be set, the display flag may be determined, and the operating state may be displayed using a display means such as an indicator light, an LED, or a buzzer.

[Effects of the Invention] As described above, the constant speed traveling device of the present invention compares the current vehicle speed with the stored vehicle speed of the storage means for storing a predetermined vehicle speed for constant speed traveling, and adjusts the vehicle speed toward eliminating the vehicle speed deviation. An electronic control circuit that controls the actuator means that controls the opening and closing of the throttle valve, and the switch involved in constant speed driving control is turned on when the speed is below the low speed limit speed that is the low speed limit at which constant speed driving control is possible. If the switch involved in the constant-speed driving control is in the on state, it may be malfunctioning and remain on, so even if the low speed limit speed is exceeded, the on state may remain in the on state. The state of the switch is not judged until the switch is cleared, and if a short circuit occurs in a switch involved in constant speed driving at a predetermined speed or higher and before starting constant speed driving, the switch status is not judged until the short circuit is removed. Control signals from switches involved in constant speed driving are not accepted. Therefore, even if a short circuit occurs in the switch before starting constant speed driving, the vehicle can be prevented from unexpectedly entering a constant speed driving state, an acceleration state, a deceleration state, or the like.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a constant speed traveling device according to an embodiment of the present invention, and FIGS. 2 to 13 are flowcharts of constant speed traveling control operations of the electronic control circuit. In the figure, BP... Vacuum pump, SV...
...Throttle valve, AC...Negative pressure actuator, ST...Surge tank, CPU...Electronic control circuit, V1-V3...Vent valve, D1-D3...
...drive circuit. In addition, in the figures, the same reference numerals and symbols indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A switch involved in constant speed driving control compares the stored vehicle speed of a storage means for storing a predetermined vehicle speed for constant speed driving with the current vehicle speed, and throttles the vehicle in a direction to eliminate the vehicle speed deviation. In a constant speed traveling device equipped with an electronic control means for controlling an actuator means for controlling the opening and closing of a valve, a device that participates in the constant speed traveling control below a low speed limit speed that is a low speed limit of the speed at which constant speed traveling control is possible. When a switch involved in the constant speed driving control is in an on state, the on state of the switch is not determined until the on state is once cleared even if the low speed limit speed is exceeded, and the A constant speed traveling device characterized by not entering a speed traveling control state. 2 The switches involved in the constant speed driving control include a set switch that memorizes the constant speed driving vehicle speed and starts constant speed driving control, and a set switch that restarts the once canceled constant speed driving control at the controlled vehicle speed of constant speed driving. The constant speed traveling device according to claim 1, characterized in that it is a resume switch. 3 The switches involved in the constant speed driving control include a set switch that memorizes the constant speed driving vehicle speed and starts constant speed driving control, and a set switch that restarts the once canceled constant speed driving control at the controlled vehicle speed of constant speed driving. The constant speed traveling device according to claim 1, characterized in that the constant speed traveling device comprises a resume switch and an accelerator switch for increasing the vehicle speed.