JPH02237836A - On-vehicle alarm device for automobile - Google Patents

Abstract

PURPOSE:To obtain the title device which immediately generates an alarm and informs a driver about danger when a dangerous distance is generated, by providing the function for always setting the judgement standard in variable manners on the basis of a plurality of information such as speed of own vehicle, air temperature, and anomaly of road surface, for a dangerous distance judging circuit. CONSTITUTION:The information related to the between-vehicle distance detected by a supersonic wave distance measuring system 1 is sent into a dangerous distance judging circuit 2. When the between-vehicle distance information is inputted into the dangerous distance judging circuit 2, the safe between-vehicle distance is calculated from the speed of an own vehicle, weather at present which is previously inputted from an information input means 7, state of road surface depending onto the weather, and the time in day or at night, and it is judged if the between-vehicle distance at present is safe or not. If the distance is dangerous, an alarm signal (a) and a brake control signal (b) are outputted, and an alarm means 8 is driven, and a brake control means 3 is excited to operate a brake mechanism 30A. When the brake mechanism 30A is operated, the alarm of the alarm means 8 and the distance measurement by the supersonic wave measuring system 1 are suspended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an on-vehicle warning device for an automobile, and particularly to an on-vehicle alarm device for an automobile that is equipped with the intention of preventing rear-end collisions.

(Prior Art) Conventionally, the distance that should be maintained with respect to the vehicle running in front of the driver's own vehicle depends on the driver's "feel" based on his own driving experience, and recognizes the safe distance between the vehicles. As a result, the distance between vehicles varies.Especially when in a hurry to reach a destination, drivers often keep the distance between vehicles below the safe distance, knowing the risks. The driver is driving in a dangerous situation where he or she is not sure if he or she will wake up.

In response to this, various attempts have been made in the past as techniques for issuing danger warnings to prevent rear-end collisions, such as techniques using ultrasonic waves.

[Problem to be solved by the invention]

In the conventional setting of the inter-vehicle distance that depends on the driver's "sensation," for example, if the vehicle in front of you suddenly applies the brakes, you may not be able to apply the brakes in time, causing a rear-end collision. Easy to cause.

In addition, even if you are initially able to keep the following distance within safety standards, the vehicle in front of you may become inattentive due to inattentive driving, drowsy driving, or being absorbed in a conversation with someone in the same weight as you.・In many cases, the driver is unaware of the approach of a ・or a curve, causing an accident and flames.

On the other hand, most of the above-mentioned methods that utilize reflection of ultrasonic waves do not take into account speed or changes in surrounding conditions. This has resulted in the disadvantage that the reliability of the alarm sound is low.

[Purpose of the invention]

The object of the present invention is to improve the disadvantages of the conventional example, and in particular, to effectively detect and set the dangerous inter-vehicle distance to the vehicle in front according to changes in vehicle speed and surrounding conditions;
To provide an on-vehicle warning device for an automobile capable of immediately issuing a warning to inform a driver when a dangerous distance L has been reached.

[Means to solve the problem]

The present invention uses an ultrasonic distance measurement system that measures the distance to the vehicle in front, and determines whether or not the vehicle has entered the C danger distance based on the distance information output from the ultrasonic distance measurement system. A dangerous distance determination circuit outputs a warning signal and a brake control signal in response to the brake control signal, and a brake control means immediately operates the brake mechanism of the host vehicle based on the brake control signal. The dangerous distance judgment circuit is configured to have a function to constantly variably set judgment criteria based on multiple pieces of information such as vehicle speed, temperature, and road surface abnormalities. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.

The embodiment shown in FIGS. 1 and 2 is based on an ultrasonic distance measuring system 1 that measures the distance to the vehicle in front 20, and distance information output from this ultrasonic distance measuring system 1. A dangerous distance determining means 2 that determines whether or not the vehicle has entered the dangerous distance and outputs a warning signal a and a brake control signal b as necessary, and immediately operates the brake machine side 30A of the host vehicle 30 based on the brake control signal. A brake control means 3 for controlling the brake is provided.

The dangerous distance determination circuit 2 has a function of constantly variably setting determination criteria based on a plurality of pieces of information such as vehicle speed, outside temperature, and road surface abnormalities. Therefore, the dangerous distance judgment circuit 2
A vehicle speed sensor 4 and an outside temperature sensor 5 are also provided.

Furthermore, the dangerous distance determination circuit 2 is also provided with information input means 7 for the operator. This information input stage 7 mainly includes data that displays the slipperiness of the road surface as a coefficient depending on the current weather and road surface conditions, etc. before driving, as well as day and night classification data specified in the same way. etc. can be entered.

As a result, the dangerous distance determination circuit 2 calculates and variably sets the determination criteria.

The brake mechanism 30A is also equipped with a brake I/- key sensor 10 that detects the presence or absence of its operation. By the operation of this brake mechanism 30A, the brake sensor 1
The signal output from 0 is sent as brake operation information to the ultrasonic distance measurement system 1 and the dangerous distance determination circuit 2, and is further sent to the 1,000-stage alarm 8. This 1000 step 8 alarm is installed in the driver's seat.

In this case, in the ultrasonic distance measurement system 1, the output of the brake sensor 10 is used as a control signal to interrupt measurement while the brake mechanism 30A is in operation, and in the dangerous distance determination circuit 2, the output of the brake sensor 10 is used as a control signal to interrupt measurement while the brake mechanism 30A is in operation. The output of the brake sensor 10 is used to confirm the presence or absence of operation of the brake sensor 30A. Furthermore, when the alarm is set to 1000 steps, it means that the driver has already recognized the danger and is applying the brakes.
From the standpoint of energy saving, B1/
- The output of the key sensor 10 is used.

FIG. 2 (2) shows a case where the road turns to the right, as an example where there is an obstacle ahead.

Next, the operation C1 of the above embodiment will be explained.7 Information regarding the inter-vehicle distance detected by the ultrasonic distance measurement system j is sent to the dangerous distance determination circuit 2-.

In this dangerous distance judgment circuit 2, when information related to the following distance is input, the speed of the own vehicle, the current weather and the road surface condition due to the weather inputted in advance from the information input stage 7, and furthermore, the safe distance between cars is determined based on the day and night conditions. Calculates the distance and determines whether the current following distance is safe. If the distance is not a safe distance, the alarm signal a and the brake control signal b are immediately output, the alarm f stage 8 is activated, and the play/key control stage 3 is energized to activate the gear 17/key mechanism 30A. It's now saze・yo・).

Here, when the brake mechanism 30A is activated, the warning by the warning means 8 and the distance measurement by the ultrasonic distance measuring system 1 are interrupted.

Then, when the brake mechanism 30A is no longer operated and the inter-vehicle distance becomes a safe distance, the ultrasonic distance measuring system 1 is immediately activated and the operation of the entire device is returned to its initial state.

[Effect of invention]

As described below, according to the present invention, when the distance between the vehicle and the vehicle in front becomes within the danger distance, the warning, L gear and brake control means are activated immediately. It is possible to effectively reduce the occurrence of rear-end accidents caused by driver's inattention to the road ahead, such as distracted driving or drowsy driving, and to quickly detect obstacles in front of the driver during bad weather. G,7 uses road surface conditions, including weather, as part of the criteria for determining the dangerous distance, and the safety standard value for the following distance is set variably. It is possible to provide an excellent in-vehicle warning device for automobiles that has never existed before, which can determine the dangerous inter-vehicle distance with high precision and can significantly improve the reliability of the entire device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
1) is an explanatory diagram showing the relationship between the own vehicle equipped with the one shown in FIG. 1 and the vehicle in front, and FIG. 2 (2) is an explanatory diagram showing the case where there is an obstacle in front. 1... Ultrasonic distance measurement system, 2...
- Dangerous distance determination circuit, 3...brake control means, 20...front vehicle, 30...own vehicle, 3
0A: Brake mechanism, a: Alarm signal, b: Brake control signal. No./cause

Claims (1)

[Claims] (1) An ultrasonic distance measurement system that measures the distance between the vehicle in front and the distance information output from the ultrasonic distance measurement system that determines whether or not the vehicle has entered a dangerous distance. a dangerous distance determination circuit that outputs a warning signal and a brake control signal in response to the brake control signal; and a brake control means that immediately controls the operation of the brake mechanism of the own vehicle based on the brake control signal, and the dangerous distance determination circuit An in-vehicle warning device for an automobile is characterized by having a function of constantly variably setting judgment criteria based on multiple pieces of information such as speed, temperature, and road surface abnormalities.