JPH0449760Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a mounting structure for a capacitive automobile proximity sensor that detects abnormal approach to a preceding vehicle or the like.

[Conventional technology]

An automotive proximity detection device that detects abnormal approach to a preceding vehicle, etc. and issues an alarm to that effect requires that at least the first stage, which is composed of a capacitance type sensor, an oscillator, and a buffer section, be installed outside the vehicle. The circuit components, such as a high frequency amplification section, a detection section, a low frequency amplification section, and a discrimination/output drive section, are installed inside the vehicle (see Utility Model Application No. 101099/1983). An example of the circuit configuration is shown in FIG. 3, and an example of the arrangement in an automobile is shown in FIG. 4.

In Figure 3, 1 is a capacitive sensor, 2
is an oscillation unit, 3 is a buffer circuit, 4 is a high frequency amplification unit that amplifies the oscillation output signal, 5 is a detection unit that outputs a DC output according to the approach distance, 6 is a low frequency amplification unit that amplifies the detection output, and 7 is this A determination/output drive unit receives a signal from the low frequency amplification unit and determines whether or not there is an abnormal approach, and issues an alarm signal when it is determined that there is an abnormal approach; 8 is an alarm indicator that displays an abnormal approach;
Part A (first stage part) is a car 10 as shown in Figure 4.
corner pole 12 at the end of the front bumper 11 of
Part B (other circuit components) is installed in the car. In addition, the display 8
is provided at the tip of the corner pole 12.

[Problem that the invention attempts to solve]

By the way, when installing the sensor 1, it is necessary to consider vibration, installation position, sensor projected area, cost, design, waterproofness, weather resistance, etc., but it is extremely difficult to satisfy all of these items.

[Means for solving problems]

The present invention is an automobile proximity detection device that detects abnormal approach to a preceding vehicle etc. by a change in capacitance and issues an alarm to that effect. A capacitive proximity sensor that also serves as a mounting stay is attached to the back of the bumper guard that is arranged at It is characterized by this.

〔Example〕

1 and 2 show an embodiment of the present invention, in which a bumper guard 13 which also serves as a support for a corner pole 12 is provided at the end (corner) of a front bumper 11 of an automobile 10, A corner pole 12 is installed on this. Therefore, when the corner pole 12 is removed, the bumper guard 13 is simply removed.
is attached to the front bumper 11.

A capacitive sensor 1 which also serves as a mounting stay is fixed to the back surface of the bumper guard 13 with screws 14. For this purpose, the bumper 11 is provided with mounting holes. A first stage circuit box 15 is fixed to this sensor 1 with screws 16. The sensor 1 will be attached to the back side of the bumper 11. An oscillating section and a buffer section are housed in the box 15, and a shield wire 17 and a sensor lead-out cord 18 used for connection with other circuit components (section B) are drawn out. The terminal at the tip of the cord 18 is fixed with a screw 16 when the box 15 is attached to the sensor 1 so as to be electrically connected to the sensor 1.

The bumper guard 13 has a wiring hole 13A extending from the sensor mounting surface to the pole planting part.
Each sensor 1 is provided with a cord insertion hole 1A through which a cord 19 for a pole tip indicator light is inserted. This cord 19 is covered with a protective tube 20. This tube 20 is for protecting the cord and preventing the cord from swinging (suppressing deterioration in sensor function due to cord swinging).

The indicator that indicates the detection of abnormal approach may also be used as the pole tip indicator light (the display format is different), or may be installed alongside the pole, or may be installed inside the vehicle along with the buzzer.

[Effect of idea]

The above structure produces the following effects.

(1) Since the proximity detection device detects a weak signal, if the sensor is not firmly fixed to the vehicle body (bumper), it will detect changes in the capacitance of the vehicle body itself with the ground object due to vibration. Although this is undesirable as it may result in false detection, the so-called sanderch structure in which the bumper is sandwiched from both sides increases the mounting strength and improves reliability.

(2) The most convenient mounting location is at the corner of the bumper, as it does not come into contact with obstacles.

(3) The sensor, which also serves as a mounting stay, and the first stage of the circuit are installed on the back side of the bumper, increasing the degree of freedom in designing the corner pole and bumper guard alone.

(4) In general, the size of the sensor increases as the electrode plate area increases, similar to capacitors. Therefore, increasing the area of the sensor (antenna) within a limited space makes signal processing easier and reduces false detections. On the other hand, since the sensor is a stay that cannot be seen from the outside, the design is not affected and the area can be large.

(5) Since it is also used as a mounting stay, costs can be reduced. It can also be used for both corner poles and bumper guards.

(6) Since the first stage of the circuit is housed on the back side of the bumper, the case structure can be made compact and strong in water resistance, weather resistance, and vibration resistance.

(7) If a metal plate is embedded as a frame in the bumper guard (formed from rubber, etc.) that serves as the corner pole support (pole base) and made conductive with screws, this frame metal plate can also be used as a sensor (antenna). can. This causes the sensor to protrude slightly from the vehicle body (bumper), extending the detection distance and making it more effective for detection.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the mounting structure for an automotive proximity sensor according to the present invention, FIG. 2 is a perspective view showing the mounting state of the same embodiment, and FIG. Block diagram showing the circuit configuration,
FIG. 4 is an explanatory diagram of the arrangement when the same device is installed in an automobile. DESCRIPTION OF SYMBOLS 1... Capacitive proximity sensor, 10... Car, 11... Front bumper, 12... Corner pole, 13... Bumper guard, 14 and 16...
...Screw, 15...First stage circuit box, 19...
Code, 20...protective tube.

Claims (1)

[Scope of utility model registration request] In a vehicle proximity detection device that detects an abnormal approach to a vehicle in front, etc. by a change in capacitance and issues an alarm to that effect, the device is installed at the corner of the front bumper of the vehicle and also serves as a corner pole support. A capacitance type proximity sensor that also serves as a mounting stay is attached to the back of the bumper guard, and a circuit box in which a first stage section consisting of at least an oscillating section and a buffer section is housed is fixed to the sensor. Mounting structure for automotive proximity sensors.