JPS5820543A - Display device for obstacle behind vehicle - Google Patents

Abstract

PURPOSE:To easily check safety in the rear of a vehicle when a brake is applied, by displaying detection of a rear obstacle also at decreasing operation of the brake in addition to the time when a vehicle is reversely moved. CONSTITUTION:An ultrasonic wave transceiver 1, used with an ultrasonic vibrator excited by an excitation circuit 2a, is set to the rear part of a vehicle, and a signal transmitted from here is reflected by an obstacle and the reflected signal can be received. This received signal is input to an arithmetic unit 2b of a distance detect unit 2, and a distance to the obstacle is arithmetically obtained, then the distance is displayed in a display unit 3 by this output. While a back switch 5a, closed at a reverse gear position of a speed change gear, and a brake detector switch 6a, closed at depression of a brake pedal, are provided, in this way, the unit 2 can be connected to a power source unit 4 not only when the vehicle is reversely moved but also when the brake pedal is depressed, and the distance is displayed in the display unit 3.

Description

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

Conventionally, rear monitoring devices that are useful when a car is parked in a garage, etc., include an obstacle detector using ultrasonic waves, an alarm that notifies the presence of an obstacle, and a car transmission that is in the reverse position. The vehicle is equipped with a transmission position detector, and is configured to activate a rearward monitoring function whenever the vehicle is reversing, based on the signal from the transmission position detector.

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 making defensive driving noises to prevent rear-end collisions. However, conventional configurations were designed to issue a warning only for rear obstacles when reversing, and were completely powerless when the above-mentioned need arose while moving forward.

The present invention addresses the above-mentioned problems and enables detection and display of rear obstacles not only when the vehicle is moving backwards but also when the brake is depressed, even when the vehicle is moving forward or stopped. It is an object of the present invention to provide a rear obstacle display device for a vehicle that can provide information on rear obstacles.

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, an excitation circuit 2a that excites this ultrasonic transducer l, and a received signal of an ultrasonic transducer Wj1. The distance to the obstacle is 11! A display device that displays the distance (visible display or alarm display) according to the output signal of the distance detection unit 2. 8, a back switch b that is linked with the transmission and is closed when the gear position is in reverse, thereby lighting up the reverse indicator light 5b; and a back switch b that is linked with the brake pedal and is closed when the brake pedal is depressed and lights up the brake light 6b. a power supply section 4 that supplies a predetermined power to the ultrasonic transducer 1, distance detection unit 2, and display 8 when the braking detection switch 6a is closed;
It consists of 7 is a key switch, and 8 is a battery mounted on the vehicle. As is clear from this, the power line for the reverse indicator light sb or the brake light 6b is shared as the power source.

As shown in Fig. 1, the input lines of the t sources M and 4 are connected through a diode 4 and a water tap 4b, so that power can be supplied to this device in any of the cases of gripping, retracting, and braking. It is structured like this.

Therefore, according to this embodiment, the system is activated not only when reversing but also when stepping on the brake, 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 it is directly powered by the brake light 6b or the vehicle reversing indicator light 5b, the special Kt source fj
It is characterized by the fact that there is no need to establish a company.

Next, a second embodiment shown in FIG. B will be described. In FIG. 2, the power supply line of the device is taken from behind the key switch 7, and the signals from the switches 5a and 6 & described above are input to the control circuit 9, and the transmission is in the reverse position or other than when the brake is pressed. The operation of the display 8 is prohibited by the plaster signal 9&. According to this second embodiment, not only when reversing but also when braking! ! ! Rearward confirmation is possible even during the loading operation, and since power is supplied to everything other than the display 8 when the key switch 7 is opened, the ultrasonic transducer -
b- has the characteristic of having a self-cleaning action against dirt and grime.

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. Even if there is a driver behind the vehicle, the brake pedal is depressed, which has the excellent effect of providing information about obstacles behind the vehicle.

[Brief explanation of the drawing]

1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a block diagram showing a second embodiment of the present invention. l...Ultrasonic transducer, g--Distance detection unit. 2a...excitation circuit, 2b...arithmetic device, 8...-display device. 4...W source section, 4&, 4b...diode, b&
... Back switch, 5b... Reverse indicator light, 6 &...
...Brake detection switch, 6b...Brake light,? ...Key switch. Representative Patent Attorney Takashi Okabe Figure 1

Claims (1)

[Claims] In a rear obstacle display device for a vehicle in which an ultrasonic transducer is installed at the rear of the vehicle to detect and display an obstacle behind the vehicle when the vehicle is backing up, the rear obstacle display device detects and displays an obstacle behind the vehicle when the brake is depressed. A rear obstacle display device for a vehicle, which is provided with a means for making this possible.