Some call it a Parking radar, other – ultrasonic sensor Parking, third Parking sonar, the fourth – the acoustic Parking system. Regardless of the name, the principle of the sensors is as follows: the signals sent by an electronic control unit (ECU), converted into ultrasonic waves and emitted by ultrasonic sensors.
They are reflected from obstacles in the signal and transmit it back to the control unit, which processes them and sends the information to the signal device located within the interior of the car. It, in turn, by means of graphic information or sound signals inform the driver about the presence of obstacles and distance.
Often the sensors are equipped with rear view camera, making picture of what is happening behind the car becomes more complete.
Parking radars, depending on the installation site, are the posterior, anterior and combined (rear + front). Rear Parking sensors are activated when reverse gear is engaged, front activated when you press on the brake pedal.
The most common Parking radars, equipped with point sensors that can be applied and cut-in, hidden inside the bumper. Many sensors must be installed on the bumper? The more – the better. With the increase in the number of ultrasonic sensors decreases the number and size of "dead zones". The number for the rear sensors should not be less than four, for the front Parking system is quite enough for two. The optimal number of sensors is 8 pieces. Do not skimp on their quantity, otherwise the moment will come when you will have to purchase a new or repair a damaged bumper.
According to the assurances of manufacturers, the "dead zones" are missing when using tape sensors, in which the function of the ultrasonic sensor performs a metallized tape, mounted on the inner side of the bumper along its entire length.
Information from the electronic control unit can be transmitted to the display not only through wires, but using radio signals. These Parking sensors is called wireless.
Ways of presenting information internal the device may be different. The most typical is in the form of a display with digital display showing the smallest distance to the obstacle. Colour charts are placed left and right of the keypad indicate which side is a liability to the movement.
Most of these devices are equipped with an audible alarm, which with decreasing distance to the obstacle pauses between the emitted beeps become shorter and when the critical distance is transformed into a continuous tone.
Most informative have Parking radars, which is displayed not only numbers and symbol information, but also a picture with the rear camera.
Most of the displays, the sensors are designed for installation on the front panel of the cabin. For drivers who are used when you move back to focus on mirrors, designed displays that are installed in the rear ceiling of the cabin so that they could be seen in the rear view mirror. New models of a Parking radar "can" display information on the rear view mirror and project it on the windshield.
Drivers, often standing up in urban traffic, it is necessary to pay attention to the presence of the Parking device option forced on and off. Otherwise, the sensors will continuously operate, irritating the driver and passengers.
No matter how sophisticated and multi-functional sensors has not been in your vehicle when you reversing, Parking and other kinds of maneuvering, use caution.
Good luck to you! No nail, no wand!