JPS6218381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear obstacle display device for a vehicle that assists in confirming safety at the rear of the vehicle.

Conventionally, rear monitoring devices useful when parking a car in a garage, for example, have been equipped with obstacle detectors that use ultrasonic waves.
Equipped with an alarm that notifies the presence of an obstacle and a transmission position detector that detects that the vehicle's transmission is in the reverse position,
Based on the signal from the transmission position detector, the rearward monitoring function is always activated when the vehicle is reversing.

However, the desire to know the distance to an obstacle behind the vehicle is not limited to when reversing the vehicle.
For example, when stopping at an intersection, we are concerned with the distance from the vehicle immediately behind us. This information is also useful for driving defensively to prevent rear-end collisions. However, the conventional configuration only issues a warning for rear obstacles when reversing, and is completely powerless when the above-mentioned need arises while moving forward.

The present invention has been made in view of the above-mentioned problem, and by making it possible to detect and display rear obstacles not only when the vehicle is moving backwards but also when the brake is depressed, it is possible to detect and display obstacles when the vehicle is moving forward or when the vehicle is stopped. It is an object of the present invention to provide a rear obstacle display device for a vehicle that can provide information on a rear obstacle even in the case of a vehicle. The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. In FIG. 1, a transducer 1 using an ultrasonic transducer that transmits and receives ultrasonic waves is shown.
and an excitation circuit 2 that excites this ultrasonic transducer 1
a and a distance detection unit 2 including a calculation device 2b that processes and calculates the received signals of the ultrasonic transducer 1 and detects the distance to the obstacle, and a distance display (visible display) according to the output signal of this distance detection unit 2. or an alarm display), a back switch 5a that is linked to the transmission and closes when the gear position is in reverse and lights up the reverse indicator light 5b, or a back switch 5a that is linked to the brake pedal and turns on the reverse indicator light 5b when the brake pedal is depressed. When the brake detection switch 6a is closed, which turns on the brake light 6b when the brake switch 6a is closed,
It is composed of the ultrasonic transducer 1, the distance detection unit 2, and the power supply section 4 which supplies a predetermined power to the display 3. 7 is a key switch, and 8 is a battery installed in the car. As is clear from this, the power supply line for the reverse indicator lamp 5b or the brake light 6b is shared as the power source. The input line of the power supply unit 4 is connected with diodes 4a and 4b as shown in Fig. 1, and is configured so that power can be supplied to the device in both the case of reversing and braking. There is.

Therefore, according to this embodiment, the device is activated not only when reversing but also when the brake is stepped on, so it is effective when you want to know the distance between you and the vehicle behind you, such as when waiting at a traffic light at an intersection. Since the power source is directly connected to the brake light 6b or the reverse indicator light 5b, there is no need to provide a power line.

Next, a second embodiment shown in FIG. 2 will be described. In FIG. 2, the power source for the device is taken from behind the key switch 7, and the signals from the switches 5a and 6a mentioned above are input to the control circuit 9, except when the transmission is in the reverse position or the brake is pressed. The operation of the display 3 is prohibited by the control signal 9a. According to this second embodiment,
It is possible to check the rear not only when reversing but also when stepping on the brake, and since power is supplied to everything other than the display 3 when the key switch 7 is closed, it has a self-cleaning effect against the ultrasonic transducer becoming contaminated with dust, etc. It has the characteristic of being able to

As described above, the present invention makes it possible to detect and display rear obstacles not only when the vehicle is reversing but also when the brake pedal is depressed. This has the excellent effect of being able to provide information about rear obstacles even when the driver is behind the wheel by pressing the brake.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the invention, and FIG. 2 is a block diagram showing a second embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Ultrasonic transducer, 2... Distance detection unit, 2a... Excitation circuit, 2b... Arithmetic device, 3...
...Indicator, 4...Power source, 4a, 4b...Diode, 5a...Back switch, 5b...Reverse indicator light, 6a...Brake detection switch, 6b...Brake light, 7...Key switch.

Claims (1)

[Scope of Claims] 1. In a rear obstacle display device for a vehicle in which an ultrasonic transducer is provided at the rear of the vehicle to detect and display an obstacle behind the vehicle when the vehicle is backing up, when the brake is depressed. A rear obstacle display device for a vehicle, comprising means for detecting and displaying the rear obstacle.