JPH08192663A - Display device in vehicle travel control device - Google Patents

Abstract

(57) [Abstract] [Purpose] A vehicle that performs tracking traveling control that controls the vehicle speed so that the inter-vehicle distance from the preceding vehicle becomes a predetermined distance and constant-speed traveling control that travels at the set vehicle speed when there is no preceding vehicle. In the traveling control device, the control contents of the tracking traveling control and the constant speed traveling control can be grasped. The display device in the travel control device includes a display unit (41) for displaying the set vehicle speed at a position visible to the driver of the vehicle when the set vehicle speed is set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle travel control device, and more particularly to a display device for displaying control contents during travel control.

[0002]

2. Description of the Related Art In order to reduce the driving operation of an automobile, a constant speed traveling device (cruise control system or the like) for performing constant speed traveling control has been put into practical use, and an inter-vehicle distance control device for performing tracking traveling control has been developed. There is. When the set switch is set, the vehicle equipped with the constant speed traveling device keeps traveling at the set vehicle speed even when the foot is released from the accelerator pedal. The set vehicle speed can be changed by operating the operation switch, and is canceled when the driver steps on the brake pedal.

On the other hand, a vehicle equipped with an inter-vehicle distance control device is
When you press the set switch, the set inter-vehicle distance is calculated from the vehicle speed at that time, and the inter-vehicle distance measurement device (camera, radar, etc.) detects the inter-vehicle distance to the preceding vehicle, and the inter-vehicle distance to this preceding vehicle is calculated. By controlling the engine output and brakes so that the set inter-vehicle distance is reached, the vehicle travels following the preceding vehicle.

[0004]

Some vehicles include both a constant speed traveling device and an inter-vehicle distance control device. In such a vehicle, both constant speed traveling control and tracking traveling control are performed. May be done at the same time. When the constant speed traveling control and the tracking traveling control are executed at the same time, the tracking traveling control is preferentially executed when there is a preceding vehicle, and the constant speed traveling control works when there is no preceding vehicle. Therefore, if the set vehicle speed for constant speed traveling is set in advance, the vehicle speed will change if the preceding vehicle changes its course and leaves the lane, and then switches to constant speed traveling control. Will return to the set vehicle speed.

At this time, it is good if there is not much difference between the set vehicle speed and the vehicle speed when the preceding vehicle disappears. However, while the set vehicle speed is set higher, the vehicle speed when the preceding vehicle disappears is low. In some cases, since the difference from the set vehicle speed is large, the constant speed traveling device automatically continues to control the acceleration of the vehicle for a long time until the set vehicle speed is reached.

If the acceleration control is automatically continued in this way, a driver who is not aware of the traveling control state feels uneasy about unintentional acceleration. The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a display device in a vehicle travel control device capable of grasping the content of travel control of tracking travel control or constant speed travel control. is there.

[0007]

In order to achieve the above-mentioned object, in the invention of claim 1, the inter-vehicle distance with the preceding vehicle is measured by the inter-vehicle distance measuring means, and the measured inter-vehicle distance is a predetermined distance. In the traveling control device for a vehicle, which comprises a tracking traveling control means for controlling the vehicle speed so that the vehicle speed is controlled and a constant speed traveling control means for traveling at a preset vehicle speed when the preceding vehicle is not captured, the preset vehicle speed is set. The display means for displaying the set vehicle speed is provided at a position visible to the driver of the vehicle.

Further, in the invention of claim 2, the inter-vehicle distance measuring means includes a function of recognizing the preceding vehicle, and the display means indicates whether or not the preceding vehicle is recognized by the inter-vehicle distance measuring means and the inter-vehicle distance. The distance and the approaching state with the preceding vehicle when the inter-vehicle distance becomes equal to or less than the predetermined distance are displayed together.

[0009]

According to the display device of the vehicle running control device of claim 1, when the set vehicle speed is set and the tracking running control or the constant speed running control is performed, the set vehicle speed is visible to the driver of the vehicle. It is clearly displayed at the position, making it easy to understand the driving control status. Further, according to the display device in the vehicle travel control device of claim 2, in addition to the set vehicle speed, the presence / absence of a preceding vehicle, the inter-vehicle distance, and the approaching state of the preceding vehicle are displayed together, so that the traveling control state can be more understood. Cheap.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a system configuration diagram of a traveling control device. The configuration of the traveling control device and the display device in the traveling control device will be described below with reference to FIG. The travel control device includes a main control unit (ECU) 2 that controls travel control.
Is provided. On the input side of this ECU 2, the ECU
2 includes a control power switch 11 for starting up, a CCD camera (not shown) provided in the front part of the vehicle, a laser radar (not shown) of a scanning system, etc. An inter-vehicle distance measuring device 12 which measures the current inter-vehicle distance DS between the own vehicles, a traveling lane recognition device 14 which mainly comprises a CCD camera and confirms the traveling lane, and a vehicle speed meter 16 which measures the current vehicle speed VS. An operation switch 18 for inputting a travel control start command and a cancellation command, and a vehicle-to-vehicle time TC and a set vehicle speed Vm described later, a throttle sensor, a wheel speed sensor, a steering angle sensor, and a warning switch (indicated by reference numeral 54 in FIG. 2). Various sensor switches 20 composed of, etc. are connected.

On the other hand, on the output side of the ECU 2, a throttle actuator 30, an automatic transmission (A / T) 32, a brake actuator 34, etc. are connected, and these are operated based on an input signal from the input side. It has become. Further, on the output side of the ECU 2, a display device (display means) 40 that is provided on the instrument panel (reference numeral 50 in FIG. 2) in front of the driver seat and displays the traveling control state is connected. The traveling control status can be easily confirmed.

As shown in the figure, the inside of the ECU 2 is divided into four processing units, that is, an input processing unit 4, a control state calculation unit 6, a control content calculation unit 8 and a display content calculation unit 10. Inter-vehicle distance measuring device 12, traveling lane recognition device 14,
An input signal supplied from the vehicle speedometer 16, the operation switch 18, and various sensor switches 20 is processed into an output signal by the control content calculation unit 8 or the display content calculation unit 10 via the input processing unit 4 and the control state calculation unit 6. Is output. The control content calculator 8 outputs drive signals to the throttle actuator 30, the A / T 32, and the brake actuator 34, and the display content calculator 10 outputs display signals to the display 40.

FIG. 2 schematically shows the vicinity of the instrument panel 50 in the driver's seat. As shown in the figure,
The instrument panel 50 is provided with the control power switch 11, the warning switch 54, the combination meter 60 having a function as the display 40, the center message display 41, and the like. The warning switch 54 is a switch for activating an inter-vehicle distance warning buzzer (not shown) that informs by a warning sound that the preceding vehicle approaches and the current inter-vehicle distance DS has become smaller.

The lever type operation switch 18 is provided on a steering wheel 56 extending from the lower portion of the instrument panel 50 to the driver side. The operation switch 18 can perform an increasing operation of a set vehicle speed Vm and a decreasing operation of an inter-vehicle time TC which will be described later by a raising operation, and an input (set) of a start command for traveling control and a setting vehicle speed Vm which is described later by a lowering operation. It is possible to perform the operation of decreasing the vehicle speed, the operation of increasing the inter-vehicle time TC, and the operation of returning to the set vehicle speed Vm (resume operation), and by operating the operation in front, it becomes possible to input (cancel) the command for canceling the travel control. There is.

As a display function, the combination meter 60 has a traveling control operation display lamp 62 for indicating whether or not traveling control is being executed and a warning buzzer operation lamp 64 for indicating whether or not the inter-vehicle distance warning buzzer is operating.
Is provided. Further, on the center message display 41, a set vehicle speed display section 42 for displaying the set vehicle speed Vm in a line drawing schematically showing the outline of the vehicle and a current vehicle between two arrows pointing in a direction away from each other are displayed. Distance between cars D
An inter-vehicle distance display unit 44 that displays S, a preceding vehicle display unit 46 that displays the presence or absence of a preceding vehicle with a line drawing that schematically shows the contour of the rear portion of the vehicle, and a warning lamp 48 are provided.
The set vehicle speed Vm displayed on the set vehicle speed display unit 42 is limited to the set range (for example, 40 to 105 km / h),
Further, the current inter-vehicle distance DS displayed on the inter-vehicle distance display section 44 is a predetermined distance D1 (eg, 99 m) which needs to be displayed.
Limited to

FIG. 3 is a flow chart showing a control routine of the traveling control executed by the ECU 2. Hereinafter, the control outline of the travel control device configured as described above will be described with reference to FIG. In step S10, the ignition O
After N, various internal values of the controller are initialized based on the system power being turned on. When step S10 ends, a constant control cycle ts (for example, 26 msec)
The processing of the main routine that is repeated every time is performed. The processing of the main routine will be described below.

In step S12, the timer for measuring the control period ts is reset. In step S14, the following distance measuring device 12, the traveling lane recognition device 14,
Various input signals supplied from the vehicle speed meter 16, the operation switch 18, and various sensor switches 20 are arithmetically processed. Specifically, reading of signals from the operation switch 18, calculation of vehicle speed VS, calculation of throttle opening, calculation of wheel speed,
Steering angle calculation, road curvature (R) estimation calculation,
Acquisition of image controller data from the CCD camera is performed.

In the next step S16, the data of the preceding vehicle is calculated based on the signal from the scanning type laser radar. Specifically, it is determined whether or not there is a candidate vehicle in the traveling lane, selection of a preceding vehicle when the candidate vehicle is in the traveling lane, and the current inter-vehicle distance DS between the preceding vehicle and the own vehicle.
And the relative speed Vba between the preceding vehicle and the own vehicle are executed, and the inter-vehicle distance warning process is executed when it is determined whether or not the alarm should be sounded from the vehicle speed VS or the inter-vehicle distance DS.

In step S18, a failure diagnosis process for a CCD camera, a scan type laser radar, etc. is executed. Here, the disturbance of the image signal from the CCD camera, the dirt of the laser radar, etc. are detected and treated as a failure. In step S20, various control data setting processing is performed based on the input signal processing result performed in step S14 and the calculation result of the preceding vehicle data performed in step S16.

Here, first, the driver operates the operation switch 1
The delay time from the preceding vehicle, that is, the inter-vehicle time TC, which is input by operating 8, is set. This inter-vehicle time TC is determined based on a map (not shown) provided in advance according to the operation amount of the operation switch 18, and its value is set in the range of 1.5 sec to 2.5 sec, for example. .

Then, the set inter-vehicle distance Dset between the own vehicle and the preceding vehicle is calculated based on this inter-vehicle time TC, and further,
Calculation of the safe inter-vehicle distances DSF1 and DSF2 is performed. The set inter-vehicle distance Dset is a threshold value for determining whether or not the preceding vehicle is within a range in which the tracking control, which will be described later, should be performed, and is also a target inter-vehicle distance during tracking of the preceding vehicle. The safe inter-vehicle distances DSF1 and DSF2 are threshold values that are used in each control mode such as tracking control, slow deceleration control, and deceleration control, which will be described later, and are provided to ensure a sufficient inter-vehicle distance. The safe inter-vehicle distance DSF1 is used in the tracking control mode and the slow deceleration control mode, and the safe inter-vehicle distance DSF2 is used in the slow deceleration control mode and the deceleration control mode. These set inter-vehicle distances Dset and safe inter-vehicle distances DSF1, DSF2
Are obtained from the corresponding maps (not shown) according to the vehicle speed.

The above steps S14 to S20
The processing of is performed by the input processing unit 4 of FIG. The next step S22 is a control mode transition process, that is, control, based on the set inter-vehicle distance Dset, the safe inter-vehicle distances DSF1, DSF2, the current inter-vehicle distance DS, and the switch operation of the driver, which are obtained as described above. This is a step of selecting a mode. This processing is executed by the control state calculation unit 6.

FIG. 4 shows each control mode and its transition in a schematic form, and each control mode and its transition will be described below with reference to FIG. By the way, in the next step S24, the control content calculation unit 8 is used to perform the traveling control.
Is a step of setting the set vehicle speed Vm, etc., and step S26 is various control output processing, that is, the throttle actuator 30, the A / T 32, the brake actuator 34
The steps for performing each drive control are described below because they are performed according to each control mode.

As shown in FIG. 4, when the power is turned on and the initialization is performed in step S10, the control mode is the initialization mode M10, and after the initialization processing is completed, the control OFF mode M12 is entered. The control OFF mode M12 is a control mode when the driving control is not performed and the driver performs a normal driving operation.

When the traveling control is started by the operation of the operation switch 18, the control mode to be changed is determined based on the execution results of the steps S14, 16 and 20 described above. The vehicle speed VS is within the control feasible range (for example, 40 km / h≤V
S ≤ 105km / h) and the current inter-vehicle distance DS is larger than the set inter-vehicle distance Dset (DS> Dset
), And transits to the constant speed control mode M14. At this time, the current vehicle speed VS is stored in the ECU 2 as the set vehicle speed Vm (Vm = VS), and in the constant speed control mode M14, the traveling control is performed so as to maintain the set vehicle speed Vm. In the constant speed control mode M14, the speed adjustment mode M16 is once operated by operating the operation switch 18.
Then, the set vehicle speed Vm can be increased or decreased.

On the other hand, when the current inter-vehicle distance DS is less than or equal to the set inter-vehicle distance Dset (DS ≤ Dset), there is a preceding vehicle. In this case, the control OFF mode M12 transits to the tracking control mode M18. In the tracking control mode M18, the vehicle travels while keeping the distance between the preceding vehicle and the preceding vehicle constant. The set vehicle speed Vm is also set at this time, but here, a value larger than the vehicle speed VS at the time of transition to the tracking control mode M18 by α (for example, 10 km / h) is stored in the ECU 2 as the set vehicle speed Vm. (Vm = VS + α). However, even when the preceding vehicle accelerates, the own vehicle does not track the preceding vehicle beyond the set vehicle speed Vm. In the tracking control mode M18, the set inter-vehicle distance Dset can be increased or decreased by temporarily moving to the inter-vehicle distance adjustment mode M20 by operating the operation switch 18 and changing the inter-vehicle time TC.

If the inter-vehicle distance DS is smaller than the safe inter-vehicle distance DSF1 when the traveling control is started, that is, if the own vehicle is too close to the preceding vehicle, the mode is changed to the slow deceleration control mode M22. To do. This slow deceleration control mode M22
Then, the control content calculator 8 of the ECU 2 controls the throttle actuator 30 to be closed to drive the engine brake to reduce the vehicle speed VS. As a result, the inter-vehicle distance from the preceding vehicle can be widened.

In the constant speed control mode M14, the preceding vehicle appears and the inter-vehicle distance DS at that time is the set inter-vehicle distance Dset.
When it is below (DS <Dset), the process proceeds to the tracking control mode M18. In the constant speed control mode M14 and the tracking control mode M18, the inter-vehicle distance DS is equal to the safe inter-vehicle distance DSF1.
When it becomes smaller than this (DS <DSF1), the control mode transits to the slow deceleration control mode M22. This safe distance D
SF1 is obtained from the map according to the current vehicle speed VS.

In the slow deceleration control mode M22, when the inter-vehicle distance DS becomes sufficiently large and the current inter-vehicle distance DS becomes equal to or greater than the safe inter-vehicle distance DSF1, (DS ≥DSF1
), And returns to tracking control mode M18. If the inter-vehicle distance DS is not widened and is still smaller than the safe inter-vehicle distance DSF2 due to the engine braking function in the slow deceleration control mode M22, the deceleration control mode M24 is entered.
In the deceleration control mode M24, the A / T 32 is downshifted and the brake actuator 34 is drive-controlled to further rapidly reduce the vehicle speed VS. As a result, the inter-vehicle distance from the preceding vehicle can be increased in a short time. When the current inter-vehicle distance DS becomes equal to or greater than the safe inter-vehicle distance DSF2, the mode is returned to the slow deceleration control mode M22. This safe inter-vehicle distance DSF2 is obtained from the map, like the safe inter-vehicle distance DSF1.

When the preceding vehicle makes a lane change or the like and suddenly disappears from the front while traveling control is performed in the tracking control mode M18, the slow deceleration control mode M22 or the deceleration control mode M24, that is, when the vehicle is lost The distance DS is infinite (DS = ∞), and in this case, the vehicle speed holding mode M2
Go to 6. In this vehicle speed holding mode M26, the vehicle speed VS at the time of the lost target is held vehicle speed Vh (Vh = V
As S), the held vehicle speed Vh is held for a predetermined time t2 (for example, 3 seconds). When the predetermined time t2 has elapsed, the process returns to the constant speed control mode M14. However, here, the vehicle speed VS at the time of the lost vehicle, that is, the held vehicle speed Vh is held for a predetermined time t3 (for example, 30 seconds) to control the traveling, and the set vehicle speed is set only when the operation switch 18 is resumed during this period. The return to Vm is performed. When the resume operation is not performed within the predetermined time t3, the held vehicle speed Vh is newly stored as the set vehicle speed Vm, and thereafter the vehicle is controlled to travel at this new set vehicle speed Vm.

After steps S22 to S26 have been executed, step S28 is executed next. This step S28 is a step executed by the display content calculation unit 10, and performs various display and alarm output processing. The output means includes a lamp output, a display output, a buzzer output and a voice warning output. Specifically, the traveling control operation display lamp 62 and the warning buzzer operation lamp 6 shown in FIG.
4. The center message display 41 and an inter-vehicle distance warning buzzer (not shown) that emits a warning sound based on the inter-vehicle distance warning process of the input processing unit 4 when the inter-vehicle distance DS becomes smaller than the alarm-activated inter-vehicle distance. is there.

Hereinafter, these traveling control operation display lamps 6 will be described.
2. The warning buzzer operation lamp 64 and the set vehicle speed display section 42, the inter-vehicle distance display section 44, the preceding vehicle display section 46, the warning lamp 48 of the center message display 41 and the operation of the inter-vehicle distance warning buzzer are set to the respective control modes. Along the way, a description will be given based on FIG. 2, FIG. 5, and FIG.

FIG. 5 shows each display content when the traveling control is being executed. When the vehicle is traveling in the constant speed control mode M14, as shown in the item (1), the set vehicle speed Vm (for example, Vm = 100) is displayed on the set vehicle speed display section 42.
(indicating the display at km / h) is displayed. Then, in order to indicate that the traveling control is being performed, the traveling control operation display lamp 62 is turned on (for example, “CRUISE” is turned on). Further, when the traveling control is performed, the inter-vehicle distance warning buzzer can be automatically operated without operating the warning switch 54, and therefore the warning buzzer operation lamp 64 is turned on (for example, "inter-vehicle distance"). And lights up)
To be done.

When the vehicle is traveling in the constant speed control mode M14 and the preceding vehicle is present and the inter-vehicle distance is sufficiently large (D> Dset), the constant speed control mode M14 remains. . At this time, as shown in section (2),
In addition to the display contents of the item (1), the current inter-vehicle distance DS (for example, the display when DS = 80 m is shown) is displayed on the inter-vehicle distance display section 44, and the preceding vehicle display section 46 displays the vehicle The rear line drawing is displayed.

When the vehicle is traveling in the tracking control mode M18, as shown in the item (3), in addition to the display contents in the item (2), the preceding vehicle display section 46 displays the line drawing of the rear part of the vehicle. A picture with the inner color changed or reversed is displayed. If the inter-vehicle distance DS becomes shorter and it is judged to be dangerous,
As described in the item (4), the warning lamp 48 further displays the warning content and is turned on, and a warning sound is emitted from the inter-vehicle distance warning buzzer.

When the brake pedal is operated during traveling control, the operation switch 18 is operated to the traveling control release side,
Further, the current vehicle speed VS is a predetermined value VS1 (for example, 35 km /
When h) or less, as shown in section (5),
When the traveling control is released, the traveling control operation display lamp 62 is turned off. Further, when the vehicle speed VS becomes equal to or lower than the predetermined value VS1, the display of the set vehicle speed Vm also disappears. Since the inter-vehicle distance warning processing function operates even when the traveling control is not performed, the inter-vehicle distance DS, the presence of a preceding vehicle, etc. are displayed regardless of whether the traveling control is performed or not. Will remain.

FIG. 6 is a diagram showing each display content when the traveling control is released and only the inter-vehicle distance warning processing function is operating. While the inter-vehicle distance warning buzzer is operating, when the inter-vehicle distance DS becomes equal to or less than the warning inter-vehicle distance, the warning buzzer operation lamp 64 remains lit as shown in the item (6), and the set vehicle speed display is displayed. Part 42
Nothing is displayed, the current inter-vehicle distance DS is displayed on the inter-vehicle distance display section 44, and the line drawing of the rear portion of the vehicle is displayed on the preceding vehicle display section 46. However, the above-mentioned (4) under the traveling control
Unlike the display of item (1), the color of the line drawing of the vehicle rear portion of the preceding vehicle display portion 46 does not change. Then, the warning lamp 48 is turned on, the warning content is displayed, and the inter-vehicle distance warning buzzer emits a warning sound.

Further, the inter-vehicle distance Ds is the set inter-vehicle distance Dset.
On the other hand, when the warning switch 54 is OFF and the inter-vehicle distance warning buzzer is not operating, the display on the center message display 41 is the same as the above (6), as shown in (7). However, the warning buzzer operation lamp 64 is turned off, and the inter-vehicle distance warning buzzer does not generate a warning sound.

The inter-vehicle distance warning processing function is automatically canceled when the vehicle speed VS becomes lower than a predetermined value VS2 (for example, 15 km / h). By the way, the center message display 41 can display the details of the failure of the CCD camera or the laser radar as a line drawing or characters.
It is also possible to display other than the above (for example, a clock display) by switching a display changeover switch (not shown), but the description thereof is omitted here.

As described above in detail, the display 40 such as the center message display 41 on the instrument panel 50 displays the current inter-vehicle distance DS, the presence / absence of a preceding vehicle, and the traveling control such as tracking control and constant speed control. Since the set vehicle speed Vm and the approaching state of the preceding vehicle are displayed in an easy-to-understand manner when the vehicle speed control is being performed, when the set vehicle speed Vm is set during traveling control, the set vehicle speed Vm is set.
Can be easily confirmed. Therefore, even if the preceding vehicle disappears in the tracking control mode, the control mode transits to the constant speed control mode via the vehicle speed holding control mode, and the driver performs the resume operation, the driver sets the target vehicle speed You can know Vm, and you can continue driving with peace of mind without feeling unintentional acceleration.

[0041]

As is apparent from the above description, claim 1
According to the display device in the vehicle travel control device, the tracking travel control means that measures the inter-vehicle distance to the preceding vehicle by the inter-vehicle distance measuring means, and controls the vehicle speed so that the measured inter-vehicle distance becomes a predetermined distance, In a vehicle travel control device including a constant speed travel control unit that travels at a preset vehicle speed when a preceding vehicle is not captured, when the preset vehicle speed is set, the vehicle is located at a position visible to the driver of the vehicle. Since the display means for displaying the set vehicle speed is provided, when the set vehicle speed is set and the tracking traveling control or the constant speed traveling control is performed, the driver of the vehicle can easily and surely grasp the set vehicle speed. It is possible to eliminate anxiety caused by unintentional acceleration.

Further, according to the display device in the vehicle running control device of the second aspect, the inter-vehicle distance measuring means includes a function of recognizing the preceding vehicle, and the display means includes presence or absence of the preceding vehicle recognized by the inter-vehicle distance measuring means. And the inter-vehicle distance and the approaching state with the preceding vehicle when the inter-vehicle distance becomes equal to or less than a predetermined distance are displayed together, so that the driver can more clearly understand the traveling control state. .

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a travel control device.

FIG. 2 is a view showing the vicinity of an instrument panel.

FIG. 3 is a flowchart showing a control routine of travel control.

FIG. 4 is a diagram showing transition of each control mode.

FIG. 5 is a diagram showing display contents of a display unit when running control is performed.

FIG. 6 is a diagram showing display contents of a display device when traveling control is not performed.

[Explanation of symbols]

 2 Main control unit (ECU) 10 Display content calculation unit 18 Operation switch 40 Display 41 Center message display 42 Set vehicle speed display 44 Inter-vehicle distance display 46 Preceding vehicle display 48 Warning lamp

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takushi Kosaka 5-3-8 Shiba, Minato-ku, Tokyo Within Mitsubishi Motors Corporation (72) Inventor Masayuki Yoshimoto 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Automotive Industry Co., Ltd.

Claims (2)

[Claims] 1. An inter-vehicle distance measuring means measures an inter-vehicle distance to a preceding vehicle and controls a vehicle speed so that the measured inter-vehicle distance becomes a predetermined distance, and a tracking traveling control means in advance when the preceding vehicle is not captured. A traveling control device for a vehicle, comprising: a constant speed traveling control means for traveling at a set vehicle speed, wherein the set vehicle speed is displayed at a position visible to a driver of the vehicle when the set vehicle speed is set. A display device in a traveling control device for a vehicle, comprising: 2. The inter-vehicle distance measuring means includes a function of recognizing the preceding vehicle, and the display means displays the presence / absence of the preceding vehicle recognized by the inter-vehicle distance measuring means, the inter-vehicle distance, and the inter-vehicle distance. The display device in the vehicle travel control device according to claim 1, wherein the display state is also displayed together with the approaching state with the preceding vehicle when the distance becomes equal to or less than the predetermined distance.