Car reversing sensor: Function and operating principle?

In today’s modern life, reversing sensors have become an indispensable part to assist drivers in parking safely and conveniently. Today, CARON PRO will join you to learn about the functions and operating principles of car reverse sensors.

What is a car reverse sensor?

Car reverse sensor

The reverse sensor is an important device mounted on the rear of the car, especially at the rear bumper. The main task of the reversing sensor is to detect and warn about the presence of dangerous obstacles near the vehicle while reversing. This helps minimize collision situations or accidents due to blind spots during reversing.

Reverse sensors are classified into two main types: ultrasonic sensors and electromagnetic sensors.

  • Ultrasonic sensor: Ultrasonic sensor uses ultrasonic waves to detect the distance between the vehicle and obstacles. The device emits ultrasonic waves and measures the time it takes for the waves to return after colliding with an obstacle. The system calculates the distance and warns the driver through sound or image on the screen.
  • Electromagnetic sensors: Electromagnetic sensors use the principle of measuring changes in resistance or magnetic fields to detect obstacles. When there is an obstacle nearby, a change in resistance or magnetic field will occur and be recorded by the sensor. The system will detect and warn the driver about the presence of obstacles.

Operating principle of car reverse sensor?

For each different type of reverse sensor, they will have different ways of operating.

Ultrasonic sensors

Ultrasonic sensors use sound waves to operate. When the vehicle is reversing, the ultrasonic sensor emits sound waves (ultrasonic waves) and then collects the waves when they collide with obstacles. The captured wave is analyzed by a computer to measure the time it takes for the wave to pass and the change in wave length or frequency. Based on these parameters, the system will calculate and determine the relative size or distance of the obstacle.

However, because the ultrasonic sensor uses sound waves, it can be affected by noise and weather effects. This may reduce sensor accuracy. Additionally, sound waves are also likely to have difficulty detecting small, narrow objects. Because the ultrasonic sensor is usually mounted on the vehicle’s bumper, it is easily affected and damaged by dirt and mud.

Electromagnetic sensors

The electromagnetic sensor uses electromagnetic waves through the receiver-transmitter to create an elliptical magnetic field behind the vehicle when the vehicle is in reverse. When backing up, if there is an obstacle, it will cause magnetic field interference on the sensor. The meter will detect voltage changes and send information to the system to analyze the data to determine the distance from the vehicle to the obstacle. The warning sound will become loud and the warning frequency will increase as the vehicle approaches an obstacle.

Electromagnetic sensors are capable of detecting a wider variety of objects than ultrasonic sensors and have a much longer lifespan. This comes from the sensor’s installation location. While the ultrasonic sensor is mounted on the outside of the car’s bumper, the electromagnetic sensor is placed inside the bumper. This helps protect the electromagnetic sensor from the impact of the external environment, ensuring its durability and performance.

What are the benefits of car reversing sensors?

Benefits of car reversing sensors

Car reversing sensors play an important role in helping the driver observe blind spots and dead corners of the vehicle, especially in limited spaces. This function helps minimize and limit unnecessary collisions when the vehicle reverses. Installing a reverse sensor allows the driver to early recognize dangers behind the vehicle and take timely preventive measures to avoid unfortunate accidents.

Car reversing sensors are one of the useful and necessary devices, even for drivers with many years of driving experience. Currently, many car manufacturers have integrated reverse sensors into their car models to ensure maximum safety for drivers. This proves the awareness of the importance and effectiveness of reversing sensors in reducing the risk of collision and ensuring safety during reversing.

With the benefits that car reversing sensors bring, this is a useful technology and worth considering for every driver. Installing a reverse sensor enhances the ability to observe and prevent accidents behind the vehicle, while also providing safety and convenience during travel.

Reputable address for installing reverse sensors for cars?


CarOn Pro – 5S standard car service system

Caron Pro is trusted and known by customers as a chain of 5S standard auto repair service centers. With extremely modern equipment, genuine spare parts, skilled technicians, a full range of services at extremely affordable prices and quality. With a variety of services and products, CarOn is committed to providing the most dedicated quality and service.

Please contact us immediately via Hotline: 1900633612 or 0919009069

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Phone: 0919009069
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