JPS5853544A - Automobile collision prevention device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a collision prevention system for automobiles.1 This type of collision prevention system is based on a distance sensor using a microphone wave or light, as shown in FIG. The distance to the obstacle, the relative distance information, and the information from the vehicle speed sensor 2 are input into the microcomputer 3, and the system predicts the danger of an accident.
An alarm is issued by a display device 4 or a sound emitting device 5 such as a buzzer or voice, or a brake 7 is operated through a control device 6 at the same time as the above-mentioned alarm.

It is generally known that the distance from when the brakes are applied until the vehicle stops is proportional to the square of the vehicle's speed.

Therefore, as the vehicle speed increases, the brake must be applied from a location farther away from the obstacle. Further, the proportionality constant varies depending on the condition of the road surface, and is known to vary significantly depending on whether the road surface is dry, wet, frozen, etc. Conventional collision prevention systems predict and judge the danger of a collision regardless of the road surface condition, so they lack accuracy in judgment. For example, if you brake suddenly from a position far enough away from an obstacle, you run the risk of being rear-ended by someone following you.

The present invention has been provided for the purpose of eliminating the above-mentioned drawbacks and making accurate judgments. FIG. 2 shows the configuration of an embodiment according to the present invention. In Figure 2, in addition to the distance sensor and the vehicle speed sensor 2, there are sensors that provide input information to the microcomputer 3.
The vehicle is equipped with a wheel direction sensor that detects the direction of the wheels] and a road surface condition detector U that detects the condition of the road surface. predict the risk of collision.

It is for judgment.

The wheel direction sensor O is installed, for example, in a steering wheel.

Detects the direction the wheels are facing. The road condition detector U can use, for example, infrared rays or microwaves.

Now, as an example, an infrared type road surface condition detector will be described. FIG. 3 is a structural diagram of an infrared road condition detector. +12 in the figure is a light emitting element that emits infrared rays;
13 is an optical system for converting infrared rays into a beam; 14 is an optical system for collecting infrared scattered light; 15 is an infrared detector; the infrared rays emitted from the light emitting element are radiated towards. Reflection from the road surface is almost completely diffused on a dry road surface, so some of the scattered light is already detected by the detector. If the road surface is wet or frozen,
A portion of the infrared rays is absorbed by water or ice, and is reflected in one direction by smooth water surfaces, so almost no infrared rays return to the receiver. Therefore, only a very weak signal enters the detector 5. In this way, there is a large difference in the output of the infrared rays and detector depending on the condition of the road surface, so it is possible to detect whether the road surface is dry, wet, or frozen.

Next, the operation of the collision prevention device of the embodiment shown in FIG. 2 will be explained.The microcomputer 3C2 inputs distance information to an obstacle by the distance sensor 117, and also processes this distance information with respect to time. Information on the distance sensor such as this, which can obtain information on relative speed, and vehicle speed sensor 2
This information is used to predict the danger of a collision and decide whether to issue a warning or apply the brakes. However, with this amount of information, there is a risk that the vehicle will recognize a curve, a vehicle turning right or a vehicle ahead, and apply sudden braking, so the direction of the wheels is detected and the road is curved.

1 = The car is moving to avoid an obstacle, or to avoid a right or left turn in front.

Wheel direction sensor provides information that the steering wheel is being operated]
It can be obtained by

Based on the above information, the microcomputer 3 predicts and judges the danger of collision and activates a warning and brakes. by the way,
Since the driving distance of a car varies greatly depending on the road surface conditions, judgments of danger must be made based on the road surface conditions. In the conventional 'Alt, the judgment was made based on values set in the computer in advance, regardless of the road surface condition. This made it difficult to make accurate judgments. In the device according to the invention:
By adding the information from the road surface condition SAYF11 as input information, more accurate judgment can be made.

By inputting it into a microcomputer and calculating [C],
Dangerous situations can be judged more accurately and a highly reliable collision prevention device can be provided.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional automobile collision prevention device, Fig. 2 is a block diagram showing an embodiment of an automobile collision prevention device according to the present invention, and Fig. 3 is a block diagram of a conventional automobile collision prevention device. FIG. 2 is a configuration diagram showing an example of a state detection sensor. In the figure, l is a distance sensor, 2 is a vehicle speed sensor, 3 is a microcomputer, 4 is a display device, 5 is a sound generator, 6
is a control device, 7 is a brake, 1o is a wheel direction sensor, 1
1 is a road surface condition sensor. In addition, the same symbols in Figure 1 indicate the same or equivalent parts.
Shin Kuzuno

Claims (1)

[Claims] A distance sensor detects the distance of the car to an obstacle, a warehouse speed sensor detects the speed of the car, a storm wheel direction sensor detects the direction of the J1 wheel, and the detection output from each of the above sensors is processed to A vehicle is equipped with a processing means for determining the danger of an automobile to a loud object, and uses the output of the processing means to control a warning device or a means for controlling the running of the automobile, and a road surface condition sensor for detecting the condition of the road surface is provided, and the above-mentioned A collision prevention system for an automobile, characterized in that the processing means also uses the detection output of the road surface condition sensor as input information for the risk judgment.