JPS6281587A - Obstacle alarm apparatus for vehicle - Google Patents

Abstract

PURPOSE:To make it possible to obtain obstacle alarm function and burglar alarm function by one apparatus, by reading a state signal showing whether a vehicle is held to a driving state or a parking state and using radar in order to generating a burglar alarm order in the parking state. CONSTITUTION:A means generating state signal P showing whether a vehicle is held to a driving state or a parking state is provided and the state signal P is inputted to a signal processing circuit. For example, an ignition key IG-SW may be utilized in this state signal generating means. When the vehicle is held to the driving state and the measured distance of matter 0 by ultrasonic radar 1 is within a preset obstacle alarm distance range, an obstacle alarm order is generated. When the vehicle is held to the parking state and the measured distance of the matter 0 by the radar 1 is in a preset burglar alarm order distance range, a burglar alarm order is generated.

Description

[Detailed description of the invention] One plate north! The present invention relates to an on-vehicle obstacle warning device that uses radar to detect obstacles and issue a warning.

Previously, an on-vehicle obstacle warning system has been developed that is equipped with an ultrasonic radar and issues an alarm when an obstacle within a certain range is detected while driving. Showa 5
8-126744).

The present invention is an in-vehicle obstacle device that not only issues an alarm when an obstacle within a certain range is detected while driving, but also functions as a security alarm device when parking. The present invention provides an alarm device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the vehicle-mounted obstacle warning device according to the present invention, as shown in FIG. An ultrasonic radar 1 that detects an object 0 by receiving the ultrasonic signal from the ultrasonic radar 1 and measures the distance to the object 0 based on the time from when the ultrasonic signal is transmitted to when the ultrasonic signal is received. Radar 1 ranging signal S
and a status signal P indicating whether the vehicle is in a driving state or a parking state, and if the vehicle is in a driving state, the mode is switched to the obstacle warning mode and the object 0 detected by the ultrasonic radar 1 is detected by the vehicle. An alarm command is given to the alarm device 3 when the object is within a preset distance range that poses an obstacle to driving, and when the vehicle is parked, the object is switched to security alarm mode and the object detected by the ultrasonic radar 1 is detected. and a signal processing circuit 2 which gives a sounding command to the driver 4 of the horn 5 when the horn 5 is within a preset close range.

Here, the on/off signal of the engine ignition switch IG-8W is used as the vehicle status signal P, and when the vehicle is in the driving condition, the status signal P is at a high level.

When the vehicle is in the parking layer, the status signal P is set to a low level.

The power line B of this device is connected to the ignition switch l0.
-Regardless of whether 3W is on or off.

The switching operation is performed by the diodes DI and D2 so that power can always be supplied from the battery BAT.

FIG. 2 shows a specific configuration of the ultrasonic radar 1 and the signal processing circuit 2. The ultrasonic radar 1 includes a transmitter HT
and a transmitter 11 that provides a transmission signal to.

A pulse oscillator 12 that provides a pulse signal to the transmitter 11
Then, the reflected wave from the object O is received through the receiver HR. It consists of a receiver 13 and a distance measuring circuit 14 that measures the time from the generation of a pulse signal from the pulse oscillator 12 until the reception signal is obtained to measure the distance to the object ○. The signal processing circuit 2 includes an AD converter 21 that converts the ranging signal S sent from the ranging circuit 14 into a digital value.
, a CPU 22 that performs the above-mentioned predetermined processing, and an I10 port 23 that sends and receives signals to and from the outside.

The signal processing circuit 2 also puts the ultrasonic radar 1 into an operating state in response to an object detection command C input from the operation unit 6.

The operation of the vehicle-mounted obstacle warning device according to the present invention configured as described above will be explained below with reference to the flowchart shown in FIG.

First, when an object detection command C is given from the operation unit 6, the signal processing circuit 2. sets the ultrasonic radar 1 to the operating state and detects the object 0.
start detection. At this time, pulsed ultrasonic signals are repeatedly transmitted until the object O is detected. When object 0 is detected and a distance measurement signal S' that measures the distance from the ultrasonic radar 1 to the object O is sent, the signal processing circuit 21
It is determined whether the state signal P of the vehicle at other times is at a high level or not, and the obstacle warning mode and the crime prevention warning mode are appropriately switched depending on the result of the determination.

At that time, if the vehicle status signal P is at a high level, the signal processing circuit 2 determines that the vehicle is in a driving state and sets the obstacle warning mode, based on the ranging signal S from the ultrasonic radar 1. Check whether object 0 is within a preset obstacle warning distance range (for example, within 2 m),
If it is within this range, the Wffl unit 3 issues an obstacle warning ffl command to issue an alarm by lighting a lamp or sounding a buzzer.

At this time, the signal processing circuit 2 determines the degree of approach of the object 0 within the obstacle warning distance range in stages based on the ranging signal S from the ultrasonic radar 1.
When the object O is within a range of ~2m from the vehicle, a first alarm command is given to the Wffl device 3 to intermittently drive a buzzer, etc., and when the object O is within a range of 1m from the vehicle, a second alarm command is given to the Wffl device 3.
It is also possible to notify the driver of the proximity of an obstacle by issuing a warning command and performing control such as continuously driving a buzzer or the like.

Further, if the vehicle status signal P is at a low level, the signal processing circuit 2 determines that the vehicle is in a parked state and sets the security alarm mode, and at that time, the W11 signal S given from the ultrasonic radar 1 Based on this, it is determined whether or not the object O is within a preset security alarm distance range (for example, within 10 cm), and if it is within that range, a crime prevention alarm command is issued to the driver 4 and the horn 5 is activated. of;!
make it move.

In that case, the alarm 3 may be used to issue a crime prevention alarm, for example, by switching the buzzer sound to a higher level and sounding it, without providing other alarm systems such as the driver 4 and the horn 5. can.

Note that the vehicle-mounted obstacle warning device according to the present invention is not limited to the one according to the embodiment described above, and for example, instead of the ultrasonic radar 1, the reflected wave of a radio wave emitted toward an object is detected relative to the object. Doppler radar measures the distance to an object based on the Doppler frequency shift that occurs due to speed, or the distance to the object is measured by the round trip time of radio waves emitted toward the object until it is reflected and received. Pulse radar, calculating the distance to an object from the beat frequency caused by the phase shift between the transmitted wave and the received waveF
M-CW radar, etc., and radar using light are widely applied. Further, as the vehicle status signal P, in addition to the on/off signal of the engine ignition switch IG-5W, other signals such as an engine ignition signal, a parking brake inch signal, etc. may be used.

In the vehicle-mounted obstacle warning device according to the present invention,
and radar means to measure the distance to an object.

A means for generating a status signal indicating whether the vehicle is in a driving state or a parked state, and an obstacle warning distance that reads the status signal and sets the distance measured by the radar to an object when the vehicle is in the driving state. signal processing means that issues an obstacle alarm command if the vehicle is within the range, and issues a crime prevention alarm command if the measured distance of the object by the radar is within a preset security alarm distance range when the vehicle is parked; It is composed of an alarm means that performs each operation of an obstacle alarm and a crime prevention alarm in response to an object alarm command and a crime prevention alarm command, and provides an obstacle warning function when the vehicle is running and a crime prevention function when parking. It has the excellent advantage of being able to

[Brief explanation of drawings]

FIG. 1 shows an on-vehicle obstacle report according to the present invention. FIG. 2 is a block diagram showing a specific configuration of each part in the embodiment, and FIG. 3 is a flowchart of the operation in the embodiment. 1...Ultrasonic radar 2...Signal processing circuit 3...
Alarm 4... Driver 5... Horn 1
1... Transmitter 12... Pulse oscillator 13...
Receiving (':i* 14...Distance learning circuit 21...AD
Converter 22...CPU23...I10 port

Claims (1)

[Claims] radar means for measuring the distance to an object; means for generating a status signal indicating whether the vehicle is in a driving state or a parked state; If the measured distance of the object is within the preset obstacle alarm distance range, an obstacle alarm command is issued, and if the measured distance of the object by the radar is within the preset security alarm distance range when the vehicle is parked. An on-vehicle obstacle warning device comprising a signal processing means for issuing a crime prevention alarm command, and an alarm means for performing obstacle warning and crime prevention alarm operations in accordance with the obstacle warning command and the crime prevention alarm command.