JP2564616Y2 - Rear-end collision warning system for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a rear-end collision warning device for a vehicle.

<Prior Art> The following is a conventional example of a vehicle rear-end collision warning device (see Japanese Utility Model Application Laid-Open No. 63-24700).

That is, a laser beam is emitted from the light emitting element at the front of the vehicle toward the preceding vehicle, the laser beam reflected by the preceding vehicle is received by the light receiving element, and the actual inter-vehicle distance to the preceding vehicle is calculated from the output of the light receiving element. I have to.

Then, when the calculated actual inter-vehicle distance becomes equal to or less than the safe inter-vehicle distance, an alarm buzzer is operated to alert the driver of a danger of a rear-end collision.

Here, the power switch of the rear-end collision warning device can be turned on and off by manual operation in consideration of, for example, the time of road congestion or the failure of the rear-end collision alarm device.

<Problems to be solved by the invention> By the way, in the conventional rear-end collision warning device, an alarm buzzer is issued when the actual inter-vehicle distance becomes equal to or less than the safe inter-vehicle distance while the vehicle is running. Although the danger of a rear-end collision of the vehicle can be detected, the danger of the rear-end collision of the vehicle cannot be determined in the operation management of the vehicle.

The present invention has been made in view of such circumstances.
It is an object of the present invention to provide a vehicle rear-end collision warning device that can determine the risk of a vehicle rear-end collision in vehicle operation management.

<Means for Solving the Problems> For this reason, the present invention provides an inter-vehicle distance measuring means for measuring an inter-vehicle distance with another vehicle ahead of the vehicle, and when the measured inter-vehicle distance becomes smaller than a predetermined safe inter-vehicle distance. A collision alarm for a vehicle, comprising: a warning means for issuing an alarm to the user; a tachograph for directly recording various operating conditions on recording paper; and a control means for recording the operation state of the warning means on the recording paper of the tachograph. An apparatus, wherein the tachograph comprises at least:
A speed recording unit that records the instantaneous speed of the vehicle, a driver recording unit that records the presence or absence of a driver change, a preliminary recording unit that performs arbitrary recording by an arbitrary signal input from outside via switching means, A distance recording unit that records a travel distance of the vehicle, wherein the control unit operates the alarm unit in the preliminary recording unit according to an operation signal of the alarm unit input through the switching unit of the tachograph. The state was recorded.

<Operation> In this way, the instantaneous speed of the vehicle, the presence or absence of a driver change, the operating state of the alarm means, and the traveling distance are directly recorded on the tachograph recording paper, respectively, so that the collision of the vehicle can be controlled at a glance. Danger can be judged. In addition, since the tachograph has a driver recording unit that records the presence or absence of a driver change, the operation status of a plurality of drivers can be determined from one sheet of recording paper, and the operation management time is reduced.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, a laser radar 1 serving as an inter-vehicle distance measuring means is attached to a lower portion of a front end of a vehicle. The laser radar 1 receives a light emitting element that emits laser light toward the front of the vehicle and a reflected laser light. And a light receiving element that emits a predetermined voltage. The light emitting element of the laser radar 1 is operated by a control device 2 as a control means including a microcomputer or the like, and a detection signal of the light receiving element is input to the control device 2. Further, a vehicle speed sensor 3 for detecting a vehicle speed is provided in the vehicle, and a detection signal of the vehicle speed sensor 3 is input to the control device 2.

Further, the control device 2 includes an on / off signal from the light switch 4 which is turned on when the headlamp is turned on (during night driving), and a parameter (for example, a margin determination time, And a signal from the setting switch 5 for setting the pedal change time). Further, a display device 6 described later and a tachograph 7 described later are provided at a front portion of the cabin.

As shown in FIG. 2, the control device 2 operates an alarm lamp 8, an alarm buzzer 9, a failure indicator lamp 10 of the device, an inter-vehicle distance indicator 11, and a transistor 12 as a switching means of a tachograph. I have. Here, the alarm lamp 8 and the alarm buzzer 9 constitute alarm means. When the power switch 13 is turned on, the control device 2 is applied with an operating voltage and starts operating.

As shown in FIG. 3, the display device 6 is provided with two alarm lamps 8, a failure display lamp 10, an inter-vehicle distance indicator 11, and a power switch 13. In addition, the display device 6 is provided with an adjustment knob 14 for adjusting the volume of the alarm buzzer 9, and a first volume display lamp 15 that is turned on when the adjusted volume is equal to or less than a predetermined value, and when the adjusted volume exceeds the predetermined value. And a second volume indicator lamp 16 that lights up.
In addition, the display device 6 is provided with actual inter-vehicle distance lamps 17 to 19 for displaying the actual inter-vehicle distance in three stages (near, middle, and far).

Next, the tachograph 7 will be described with reference to FIGS. 4 and 5. The tachograph 7 contains a recording paper 21 as a disk-shaped recording medium shown in FIG. In the tachograph, a speed recording unit A for recording the instantaneous speed of the vehicle, a driver recording unit B for recording whether or not the driver has been replaced, and an arbitrary recording by an arbitrary signal externally input via the transistor 12 are provided. A preliminary recording unit C for performing the recording and a distance recording unit D for recording the traveling distance of the vehicle are provided.

Then, based on the signal input through the relay harness 22, as shown in FIG.
The presence or absence of driver replacement and the traveling distance are recorded over time.

The tachograph 7 is provided with a spare transistor 12 for causing the preliminary recording unit C to perform arbitrary recording. One of these transistors 12 is provided with the control device 2.
Is input, and the presence or absence of an alarm is recorded in the preliminary recording section C of the tachograph 7.

 Next, the operation will be described with reference to FIG.

Laser light is emitted from the light emitting element of the laser radar 1 at the front of the vehicle toward the reflector F of the preceding vehicle E, the laser light reflected from the reflector F is received by the light receiving element, and the signal is input to the control device 2. . Further, a signal from the vehicle speed sensor 3 is input to the control device 2.

The control device 2 calculates the actual inter-vehicle distance with the preceding vehicle E based on the signal from the laser radar 1, and calculates the actual inter-vehicle distance and the vehicle speed of the own vehicle (hereinafter referred to as the own vehicle speed). Vehicle speed of the preceding vehicle (hereinafter referred to as forward vehicle speed)
Is calculated. Then, the calculated inter-vehicle distance is displayed on the inter-vehicle distance display 11.

The control device 2 calculates the calculated own vehicle speed VF and the front vehicle speed.
A first safe inter-vehicle distance S1 and a second safe inter-vehicle distance S2 are calculated based on VA.

S1 = VF (TD + TX1) S2 = VF (TD + TX2) + VF 2 / 2α TD pedal踏替time, TX1, TX2 afford determination time, alpha is the vehicle deceleration.

When the preceding vehicle is a moving object and the vehicle speed difference between the own vehicle speed and the forward vehicle speed is less than 50 km / h, it is determined to be dangerous if the actual inter-vehicle distance is less than the first safe inter-vehicle distance S1. When the vehicle speed difference is 50 km / h or more for a moving object, it is determined to be dangerous when the actual inter-vehicle distance is less than the second safe inter-vehicle distance S2. However, when the forward vehicle speed exceeds the value of 0.25 times the own vehicle speed, the above determination is not performed.

Further, when the preceding vehicle is a stationary object, it is determined to be dangerous if the actual inter-vehicle distance is less than the second safe inter-vehicle distance S2 regardless of the vehicle speed difference. However, when the value of 0.25 times the own vehicle speed is equal to or less than the forward vehicle speed, the above determination is not performed.

Then, when it is determined that there is danger, the control device 2 operates the alarm lamp 8 and the alarm buzzer 9 to notify the driver of the danger. Further, when it is determined that the danger is dangerous, the control device 2 turns on the transistor 12 of the tachograph 7 and causes the preliminary recording unit C of the tachograph 7 to record the determination.

Here, when the power switch 13 is turned on and the operating voltage is applied, the control device 2 performs each of the above-described controls.

As described above, when the power switch 13 is turned on and it is determined that there is a danger of a rear-end collision based on the actual inter-vehicle distance, the alarm lamp 8 and the alarm buzzer 8 are activated, and the transistor 12 is turned on to turn on the tachograph 7. Since the state is recorded on the recording paper 21, the occurrence frequency of the danger of a rear-end collision can be accurately determined from the recording condition of the recording paper 21 even in the operation management. At this time, the recording paper 21 can be expanded to confirm the running state in units of seconds, and since the calendar date is entered, even if a rear-end collision occurs, it is determined whether or not it is an accident at the time of the alarm activation. it can.

<Effects of the Invention> As described above, the present invention activates the alarm means when it is determined that there is a danger of a rear-end collision based on the actual inter-vehicle distance, as well as the rear-end collision and the vehicle that causes the collision. By directly recording the instantaneous speed, the presence or absence of driver change, the operating state of the alarm means, and the mileage on the tachograph recording paper, it is possible to foresee the risk of a rear-end collision in vehicle operation management, and to take preventive measures. Can take. In short, at a glance at the tachograph recording paper, it is possible to understand the driving situation of each driver as if it were a hand.For example, by alerting a driver who frequently activates the alarm means, Can be instructed to keep safe driving.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of the same, FIG. 3 is an enlarged view of a main part of the same, FIG. FIG. 6 is an enlarged view of another essential part of the above, and FIG. 6 is a view for explaining the operation of the above. DESCRIPTION OF SYMBOLS 1 ... Laser radar, 2 ... Control device, 3 ... Vehicle speed sensor, 7 ... Tachograph, 8 ... Alarm lamp, 9 ... Alarm buzzer, 12 ... Transistor, 21 ... Recording paper

Claims (1)

(57) [Scope of request for utility model registration] An inter-vehicle distance measuring means for measuring an inter-vehicle distance from another vehicle in front of the vehicle; an alarm means for issuing an alarm when the measured inter-vehicle distance is less than a predetermined safe inter-vehicle distance; Is a rear-end collision alarm device for a vehicle, comprising: a tachograph that directly records the recording paper on a recording paper; and a control unit that records an operation state of the alarm unit on the recording paper of the tachograph. A speed recording unit that records the instantaneous speed of the vehicle, a driver recording unit that records the presence or absence of a driver change, a preliminary recording unit that performs arbitrary recording with an arbitrary signal input from outside via switching means, A distance recording unit that records a mileage of the vehicle, wherein the control unit is configured to transmit the travel signal of the alarm unit through a switching unit of the tachograph to the preliminary recording unit. A rear-end collision warning device for a vehicle, wherein an operation state of the warning means is recorded.