JP2017032432A5

JP2017032432A5 -

Info

Publication number: JP2017032432A5
Application number: JP2015153344A
Authority: JP
Filing date: 2015-08-03
Publication date: 2017-07-27
Anticipated expiration: 2035-08-03

Claims

An ultrasonic object detection device (13) applied to a vehicle (100) capable of opening and closing a rear door (10) by an actuator (11),
Transmission / reception units (21 to 23) that are installed at the rear of the vehicle other than the rear door, transmit a transmission signal as pulsed ultrasonic waves to the rear of the vehicle, and receive a reflection signal as a reflected wave from an object When,
A determination unit (25) for determining whether an object exists in a predetermined range behind the vehicle based on the reflection signal, using a threshold;
An open / close state recognition unit (25) for recognizing the open / close state of the rear door;
With
The determination unit changes the threshold value in a direction that makes it difficult to determine that the object exists, on the condition that the opening / closing state recognition unit recognizes that the rear door is being opened and closed, and the object is the vehicle The object is determined to exist in the predetermined range behind the vehicle on the condition that the number of times determined to be in the predetermined range behind the vehicle is greater than the predetermined number of times, and the open / close state recognition unit When it is recognized that the rear door is being opened and closed, the ultrasonic object detection device is changed so as to increase the predetermined number of times .

The determination unit changes the threshold in a direction that makes it difficult to determine that the object exists until a predetermined time elapses after the opening / closing state recognition unit recognizes that the opening / closing of the rear door has started. after a predetermined time has elapsed, ultrasonic object detector of claim 1, wherein the returning the threshold to a state before closing of the rear door.

A reception time calculation unit (24) for calculating, as a reception time, a time elapsed from when the transmission signal is transmitted by the transmission / reception unit until the reflection signal from the object is received;
The determination unit determines, based on the reception time calculated by the reception time calculation unit, that the object exists in the predetermined range behind the vehicle using the threshold value. Item 3. The ultrasonic object detection device according to Item 1 or 2 .

The open / close state recognition unit recognizes that the rear door is being opened and closed, and the object is present in the predetermined range behind the vehicle by the determination unit during a period until the rear door is removed from the predetermined range. When it is determined that the reception time is calculated a plurality of times by the reception time calculation unit, and the change mode of the reception time is assumed to be reflected by the rear door being opened and closed, The ultrasonic object detection device according to claim 3 , further comprising a confirmation unit (25) for confirming that the object is not the rear door.

The vehicle includes a reflected wave voltage calculation unit (24) that calculates a reflected wave voltage corresponding to the reflected signal received by the transmission / reception unit,
The determination unit determines that the object exists on the condition that the reflected wave voltage calculated by the reflected wave voltage calculation unit is larger than a predetermined voltage as the threshold,
The determination unit increases the threshold during a period until the rear door is removed from the predetermined range when the open / close state recognition unit recognizes that the rear door is being opened / closed. Item 5. The ultrasonic object detection device according to any one of Items 1 to 4 .

The object detection device determines that the object exists in the driver in the predetermined range behind the vehicle on condition that the determination unit determines that the object exists in the predetermined range behind the vehicle. A first notification unit (26, 27) for notification;
When the opening / closing state recognition unit recognizes the opening / closing of the rear door while notifying the driver that the object exists in the predetermined range behind the vehicle, the first notification unit period until disengaged said rear door from ultrasonic object detection apparatus according to any one of claims 1 to 5, characterized in that for holding the notification.

When the opening / closing state recognition unit recognizes the opening / closing of the rear door, the determination unit passes the opening / closing of the rear door during the period until the rear door is removed from the predetermined range. for the reflection signal reflected by the range, ultrasonic object detection apparatus according to any one of claims 1 to 6, characterized in that even if it receives not carried out the judgment.

The object detection device includes a second notification unit (26, 27) for notifying the driver of the fact when the determination is prohibited
The determination unit, when the opening / closing state recognition unit recognizes that the rear door is being opened / closed, prohibits the determination during a period until the rear door is removed from the predetermined range. The ultrasonic object detection device according to any one of 1 to 7 .

The vehicle includes a reflected wave voltage calculation unit (24) that calculates a reflected wave voltage corresponding to the reflected signal received by the transmission / reception unit,
The determination unit determines that the object is present in the predetermined range when the reflected wave voltage calculated by the reflected wave voltage calculation unit is larger than the reflected wave voltage calculated last time. ultrasonic object detection apparatus according to any one of claims 1 to 8.

The ultrasonic object according to any one of claims 1 to 9 , wherein the open / close state recognition unit recognizes the open / close state based on an open / close instruction signal for instructing opening / closing of the rear door. Detection device.

The vehicle includes a photographing unit that photographs the rear of the vehicle,
The closing state recognition unit based on the image taken by the imaging unit, ultrasonic object detection apparatus according to any one of claims 1 to 10, characterized in that to recognize the open or closed state.