Rear Obstacle Warning Sensor
Maybe you have experienced hitting obstacles in the back of the car while driving. When driving old generation cars, due to low visibility during reverse gear, many problems arose for drivers, until with the advancement of technology in the automobile industry, rear obstacle warning sensors rushed to help drivers to prevent their vehicle from hitting obstacles. In this article from Act Group, we will teach you what the rear obstacle warning sensor is and how it works.
Maybe you have experienced hitting obstacles in the back of the car while driving. In driving old generation cars, due to low visibility during reverse gear, there were many problems for drivers, until with the advancement of technology in the automobile industry, rear obstacle warning sensors rushed to help drivers to prevent their vehicle from hitting obstacles.
The history of the invention of the reverse gear sensor or park sensor
The sensor for detecting objects and obstacles in the movement path was originally designed for the blind. Mr. Dr. Tony Hayes, who was from England, invented the reverse gear sensor system in the late 1970s.
When he is studying on. The movement of the blind and partially sighted was at the University of Nottingham, England. The idea of the reverse gear sensor came to his mind.
The Parking Sensor was first introduced under the name Reverse Aid… which was a product of Sonic Pathfinder. The field of activity of this company was in the field of design and production of devices for the blind.
Dr. Tony Hayes invented his first company. Jaguar Motor Company in England offered. The interesting thing to note here is that the relevant official at Jaguar Company.
In a polite tone, he answers them that you like the reverse gear sensor because you are a one-eyed driver… and ordinary people don’t need such an invention. It is worth mentioning that one of the eyes of Dr. Tony Hayes was blind.
Of course, Dr. Tony Hayes was not disappointed and continued his efforts. He negotiated with local builders.
And he was able to convince the manufacturers of heavy vehicles to install the rear gear sensor on large vehicles such as trucks, trailers. and install a tractor.
What is the car's reverse gear sensor?
Parking Sensors are one of the types of road vehicle sensors. which can inform the driver of the presence of obstacles behind the car, especially when parking the car, or moving backwards or even moving forwards.
In fact, this system performs the task of checking and controlling the distance of the car from obstacles. This system can be used as an ABS brake.
The car was designed for the safety of the car. With the help of this system, you can easily move backward or even forward.
Each park sensor system contains a central unit for analyzing the input and output signals, connecting wires, several eyepieces or output sensors, an LCD screen. with warning signs. And it shows the distance as well as the buzzer or the warning sound.
The number of reverse gear sensors installed. On the rear bumper of today’s cars, there are usually between 2 and 4 eye sensors.
In fact, cheaper cars 2 and more valuable and expensive cars have. 4 reverse gear sensors. They are on their rear bumper. Even some luxury cars have.
6 sensors are installed on their bumper to cover all the rear directions of the car.
How the sensor works and warns the driver
This is how the sensor warns the driver. The closer the rear of the car gets to the obstacle, the louder the sound and intensity of the LED lamp flashes on the display.
In some In more advanced cars, this sensor is also used in the front bumper, and these sensors are installed and used to detect obstacles in front of the car. Of course, the sensors of the distance meter in front of the car.
At low speeds (for example, under 15 km/h. they are activated… and the gear must be in forward mode).
In some cars, a separate button is installed inside the cabin to activate or deactivate the front sensor. Of course, in advanced cars.
In the world, more sensors are used for very interesting applications, such as avoiding leaving continuous road lanes or automatic car parking.
Ultrasonic rear gear sensor
The most common rear obstacle warning sensors used in cars are ultrasonic sensors. Since almost all objects reflect sound waves, this feature is a good reason to use an ultrasonic sensor, because the parking sensor.
Ultrasonic works based on the emission of ultrasonic frequency and receiving the reflection of sound waves.
To know how the reverse gear parking sensor works, you must first familiarize yourself with the working principle of the ultrasonic sensor.
The human ear can only hear sound frequencies between 20 Hz and 20 kHz. and above and below this frequency cannot be heard by humans.
Working frequency of the ultrasonic sensor. It is above 18 kHz and is usually set between 40 and 55 kHz depending on its application and design.
The ultrasonic reverse gear sensor consists of two parts. A circuit that generates pulses, sound waves with a frequency.
Produce high and these waves are sent by the sound transmitter towards the obstacles. After the waves collide with the objects, they return to the receiver.
By calculating the duration of the frequency round trip by the processor, the device is able to identify the distance of the objects, and this means that the shorter the duration, the closer the car is to the object.
Electromagnetic reverse gear sensor
Currently, some large and professional automobile companies such as Audi, Fiat and Citroen use electromagnetic reverse gear sensors. Mounted.
They use it on their cars because there is no need to drill holes to install this type of sensor.
There is no shield and placement of 4 or 6 sensors, which helps the appearance of the car, while with the presence of electromagnetic sensors, more space can be controlled by the driver.
The operation of the electromagnetic reverse gear sensor is as follows. that the internal coils of these sensors are a magnetic field.
They create around the rear bumper of the car and just as the car approaches an object, changes in the magnetic field occur.
This change in the form of voltage or current to the central processor or microcontroller. It is sent and the system takes these changes as a warning.
It shows audio or video to the driver. The price of the electromagnetic reverse gear sensor is much higher than the ultrasonic sensor.
When is the parking sensor (reverse gear sensor) activated?
As soon as the vehicle is in reverse gear, the reverse gear sensor is activated. It means exactly the same. The mechanism by which the reverse light turns on.
The parking sensor usually starts beeping and warning from a distance of 2 or 5 meters. First this warning horn.
It is in the form of horns with a long time interval, and the closer the car gets to the object, the number of these horns increases.
And the time interval between them also decreases so that the sound of the horn is continuous at a distance of 20 to 40 cm. It is possible, it means that the distance is very short.
0 Comments