JPH04198791A - Rear-end collision preventive device - Google Patents

Abstract

PURPOSE:To prevent the rear-end collision corresponding to the preceding vehicle speed and succeeding vehicle speed only as required when a driver starts to decelerate by transmitting the deceleration action start of the driver to the succeeding vehicle, and receiving the reflected signal to obtain the inter-vehicle distance and the succeeding vehicle speed. CONSTITUTION:When a driver steps on a brake pedal for a deceleration action, a brake switch 2 is turned on, and a deceleration start signal 9 is generated. The signal 9 is sent to a CPU 20 from a transmitter 5 and transmitted to a succeeding vehicle 10 via a transmitting antenna 6. The CPU 20 compares the signal 9 from the transmitter 5 and the signal 9 from a rear receiver 12 to obtain the present inter-vehicle distance m1 from the succeeding vehicle (other vehicle) and its vehicle speed V2. The reference inter-vehicle distance m0 and the present inter-vehicle distance m1 are compared, if m0>m1 is judged, a lamp 8 is flashed to send an alarm on the short inter-vehicle distance to the succeeding vehicle 10, and a buzzer 15 is sounded and a warning is displayed on a display 16 to give warnings on the short inter-vehicle distance to the driver.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rear-end collision prevention device, and more particularly to a rear-end collision prevention device that provides early warning of a reduction in headway distance.

[Prior Art] Conventionally, devices for preventing rear-end collisions of vehicles include a stop lamp that lights up when the driver depresses the brake pedal.
If you are fishing on a boat and the stop lamp of the car in front lights up, the driver of the car behind will visually check the stop lamp and judge whether to shorten the following distance and decelerate by stepping on the brake pedal to avoid a rear-end collision. It was being prevented.

However, when the driver of the vehicle behind can take action to prevent a rear-end collision by visually checking that the stop lamp is lit, if the driver of the vehicle behind is looking aside, the deceleration operation will be delayed, making it difficult to prevent a rear-end collision, especially when driving at high speeds. turn into.

Therefore, as a solution to this drawback, there has been a conventional
Publication No. 6-135351 and Reikai Sho 58-156874
There is something disclosed in the publication No.

Among these conventional examples, the device proposed in Japanese Patent Application Laid-Open No. 56-135351 transmits a signal wave and calculates the distance to the obstacle from the reflected wave from the obstacle (including other cars). Changes are detected and the frequency of the warning sound is changed accordingly to notify the driver of changes in the distance to obstacles, etc.

Furthermore, in the device disclosed in Japanese Patent Application Laid-open No. 58-156874, a first moving object transmits an optical signal, and a reflected light from a second moving object that approaches is received. Changes in the distance between the two moving objects are detected, and when the second moving object approaches within a predetermined distance, an alarm signal is sent to the second moving object to make it aware of the approach.

[Problem to be solved by the invention]

However, the former conventional example is configured to constantly detect changes in the inter-vehicle distance and issue a warning.
It is not suitable for the purpose of preventing the risk of rear-end collision.

In addition, in the latter conventional example, when the distance between vehicles falls below a certain value, the warning continues to be issued, so a special switch is activated during traffic jams.

Unless the switch is turned off, the alarm will continue to sound, and if the switch is turned off, it will no longer be able to prevent rear-end collisions. Furthermore, since the standard inter-vehicle distance is always constant and the vehicle speeds of the vehicle in front and behind are not taken into consideration,
Depending on the speed of both vehicles, there may be a risk of a rear-end collision.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rear-end collision prevention device that can warn the vehicle in front and the vehicle behind in advance of shortening the distance between vehicles only when necessary.

[Means for Solving the Problems] In order to solve the above problems, the rear-end collision prevention device according to the present invention includes means for detecting the start of a driver's deceleration operation;
A transmitting means for transmitting a signal to the rear vehicle informing the start of the deceleration operation, a rear receiving means for receiving a reflected signal of the signal from the rear vehicle, an alarm means, an own vehicle speed detecting means, and the reflected signal. determining means for issuing an alarm by the warning means when it is determined that the inter-vehicle distance calculated from the reflected signal is less than a reference inter-vehicle distance obtained from a built-in map based on the rear vehicle speed calculated from the reflected signal and the own vehicle speed. ing.

Further, the present invention may further include front receiving means that receives the transmission signal from the front vehicle and notifies the driver of the start of deceleration operation of the front vehicle by means of an alarm means.

[Function] In the present invention, when the driver's deceleration operation start detection means is activated, the transmission means receives this deceleration operation start signal and transmits a signal to the rear vehicle.

Then, the determination means that receives the reflected signal from the rear vehicle of this transmitted signal via the rear receiving means detects the vehicle speed and inter-vehicle distance of the rear vehicle from this reflected signal and the transmitted signal, and calculates the detected vehicle speed and distance of the rear vehicle. The vehicle speed detected by the vehicle speed detection means is compared with the reference inter-vehicle distance determined from the built-in map.

As a result, if it is determined that the current inter-vehicle distance is less than or equal to the reference inter-vehicle distance, an alarm is issued to the own vehicle and the following vehicle via the alarm means.

Therefore, the risk of a rear-end collision can be notified to the driver of the front vehicle according to the inter-vehicle distance depending on the vehicle speeds of the front vehicle and the rear vehicle.

Further, in the present invention, when the transmission signal is transmitted from the front vehicle, it is received by the front receiving means of the rear vehicle, and the driver of the rear vehicle is notified of the start of the deceleration operation of the front vehicle by the warning means. This makes it possible to immediately notify the driver of the danger of a rear-end collision.

〔Example〕

FIG. 1 is a block diagram showing the configuration of an embodiment of the rear-end collision prevention device according to the present invention, and in the same figure, I indicates that the amount of depression of the accelerator pedal (not shown) is zero or a value equivalent to this. 2 is a brake switch that is turned on when a brake pedal (not shown) is depressed; 3 is a vehicle speed sensor as a vehicle speed detection means; 4 is accelerator switch 1 or brake switch 2
This is an OR gate that sends a signal to the transmitter 5 when turned on, and together with the accelerator switch I and the brake switch 2, constitutes means for detecting the start of the driver's deceleration operation.

Further, 6 is a transmitting antenna that transmits a deceleration operation start signal 9 (hereinafter sometimes simply referred to as signal 9) from the transmitter 5 toward the rear vehicle 10, and together with the transmitter 5 constitutes a transmitting means. . 7 is a lamp that lights up when the brake switch 2 is turned on; 8 is an alarm lamp that lights up in response to a signal from the CPU 20, which will be described later; 12 is a rear receiver that receives the signal 9 reflected by the rear vehicle 10 via the rear receiving antenna 11; It constitutes a rear receiving means together with the rear receiving antenna 11.

A front receiver 14 receives a signal 9 from a front vehicle (not shown) via a front receiving antenna 13, and together with the front receiving antenna 13 constitutes a front receiving means. 1
5 is a buzzer as a warning means together with the lamps 7 and 8 and the display 16 mentioned above, and 20 is a CPU as a determination means equipped with a Doppler radar 21 and a map 22 as shown in FIG.

Next, the operation of the above embodiment will be explained.

First, when the driver returns the accelerator pedal to reduce the deceleration, or presses the brake pedal, the accelerator switch! Alternatively, the brake switch 2 is turned on, energizing the transmitter 5 and generating the deceleration operation start signal 9.

At this time, signal 9 is transmitted! 'ii 5 is also sent to the CPU 20 and transmitted to the rear vehicle 10 via the transmitting antenna 6.

On the other hand, the rear receiver 12 receives the signal 9 reflected by the rear vehicle 10 via the rear receiving antenna 11 and sends it to the CP.
Send to U20.

As shown in FIG.
Find the current inter-vehicle distance of 1 m+ and the speed of the other vehicle, V.

And this other vehicle vehicle speed V! A reference vehicle open road ame corresponding to the host vehicle speed v detected from the vehicle speed sensor 3 is obtained from the map 22 shown in FIG. 3, and this reference vehicle open road mmo is compared with the current inter-vehicle distance a m + .

As a result, if it is determined that m 6 > m 1 , the lamp 8 is flashed to warn the driver of the vehicle behind 10 to shorten the following distance, the buzzer 15 is sounded, and the display 1 is turned on.
6, the driver of the own vehicle is also alerted to the shortening of the following distance.

In addition, the map 22 shown in FIG.
The inter-vehicle distance Hmo corresponding to , and V can be calculated and created.

Further, the front receiver 14 receives the signal 9 from the vehicle in front via the front receiving antenna 13, and sends this signal 9 to the buzzer 15 and display 16, thereby prompting the driver of the vehicle in front to perform a deceleration operation. Instant alert for start.

In addition, the above-mentioned embodiment is activated even when the parked vehicle is parked, and if there is a possibility of a rear-end collision based on the vehicle speed and inter-vehicle distance of a vehicle approaching from behind, the lamp 8 is blinked to improve the visibility of the parked vehicle. In addition, in the case of an approaching vehicle, an air piston that is activated by the signal 9 from the parked vehicle is installed on the driver's seat, and if there is a possibility of a rear-end collision, the reciprocating movement of the air piston by the signal 9 causes the driver to The seat may be vibrated up and down, and the seat vibration may alert the driver to danger.

〔Effect of the invention〕

As explained above, in the rear-end collision prevention device according to the present invention, the driver's start of deceleration operation is transmitted to the rear vehicle, the reflected signal is received, the inter-vehicle distance and the rear vehicle speed are determined, and the driver The system is configured to issue a warning by comparing the standard inter-vehicle distance and inter-vehicle distance obtained from the map based on the vehicle speed and own vehicle speed, so that the vehicle speed will be adjusted based on the vehicle speed of the front vehicle and the vehicle speed of the rear vehicle only when the driver needs to start deceleration operation. Corresponding rear-end collision prevention can be performed.

In addition, by receiving a signal from the vehicle in front and notifying the driver of the vehicle in front that the vehicle in front has started decelerating,
It is possible to immediately notify the driver of the rear vehicle that the vehicle in front has started decelerating.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the rear collision prevention device according to the present invention, and FIG. Figure 3 is a map diagram of vehicle speed and inter-vehicle distance used in the rear-end collision prevention device according to the present invention;
It is. In the same, 1.2 and 4 are an accelerator switch, a brake switch, and an OR gate as means for detecting the start of deceleration operation by the driver, 3 is a vehicle speed sensor, 5 and 6 are a transmitter and an antenna as transmitting means, 7.8.15 and 16 a lamp, buzzer and display as warning means; 11.
12.13 and 14 are antennas and receivers as front and rear receiving means, respectively; 20 is C as determination means;
PU, respectively. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A means for detecting the start of a deceleration operation by the driver, a transmitting means for transmitting a signal notifying the start of the deceleration operation toward a rear vehicle, and a rear receiving means for receiving a signal reflected from the rear vehicle of the signal. , a warning means, an own vehicle speed detection means, and when the inter-vehicle distance calculated from the reflected signal is less than or equal to a reference inter-vehicle distance obtained from a built-in map based on the rear vehicle speed calculated from the reflected signal and the own vehicle speed; A rear-end collision prevention device comprising: determination means for issuing a warning by the warning means upon determination. (2) The rear-end collision prevention device according to claim 1, further comprising front receiving means which receives the transmission signal from the vehicle in front and notifies the driver of the start of deceleration operation of the vehicle in front by means of an alarm means.