What is pre-crash safety system?

Many manufacturers are now promoting a new technique, known as pre-crash safety system. The system is a general principle by sensors to monitor vehicle status, automatic response measures to reduce the risk at the moment immediately before the collision. It sounds like active safety systems, it is not true, because if the pre-crash safety system is activated in normal driving, in most cases means that the collision has been inevitable. In addition, the pre-crash safety system is not a stand-alone device, but rather a collection of numerous active and passive safety systems. ESP seat belt and, if necessary, will be integrated in.


Mercedes-Benz car company is one of the earliest studies of safety, so in terms of pre-crash safety system also has a high achievement. At present the famous pre-safe pre-crash safety system has spread to the C-class, E-class and S-class.

In Benz has two similar words in terms of security : ldquo; pro-saferdquo; and ldquo; pre-saferdquo ;. pro-safe represents ldquo; rdquo ;, the overall security concept concept vehicle safety into four phases: First, the active safety systems reduce the probability of accidents; in the second stage, if it detects a danger, a number of preventive measures will reduce the risk of injury. When the accident occurred, passive safety systems provide protection for the driver. The fourth stage includes further measures to be taken to facilitate the rescue work after the accident unfold.

“night vision systems and pre-crash safety systems integrate”

and pre-safe system belongs to the whole the second stage pro-safe security concept. The system first appeared in 2003 Mercedes-Benz S-class, which the steering angle of the vehicle by monitoring the ESP, lateral acceleration, and braking force data, when detecting driver avoid danger, pre-safe may be pre-tighten the seat belt, and the seat adjustment to the minimum angle of collision damage. After pre-safe also been upgraded with microwave detectorsAnd brake assist, the braking system may automatically applying the maximum deceleration of 0.4G upon detection of an imminent collision, while the windows close automatically.


Toyota pre-crash safety system called Pre-Collision System, referred to as PCS. With the advantages of electronic technology, Toyota is not only the first pre-crash safety system equipment in one of the production car brand, and always has been a world leader.

Toyota’s Pre-Crash Safety system first appeared in 2003, equipped on the Lexus RX and LX models. This sensor system is a millimeter wave radar mounted on the front. The radar can automatically detect obstacles in front, the estimated likelihood of a collision. If the system determines that a collision is very likely, it will sound an alarm, prompting the driver to circumvent. At this point other active safety devices will also be integrated together, Brake Assist (BA) will enter the ready state, to assist the driver in vehicle braking.

“radar detector hidden in the front.”

experienced several years of development, Toyota PCS have also been some improvements. A portion of the microwave radar models on the basis of the camera also increased, so that the sensitivity of the system is further improved. The system now consists of four system components: the pre-crash seatbelt pre-crash brake, pre-crash brake assist control and suspension. Brake system may have been achieved even if the driver has not stepped on the brake pedal, the brake system can be applied portion of the braking force. The suspension control system can suppress the nose dive of the vehicle at the time of full braking.

in the domestic market, PCS systems and equipment in the Lexus GS460 , LS460L honorable Extended Edition, LS600hL and RX350 GLS on.


Volvo has always been known for safety, in terms of pre-crash safety system will naturally notless. The system is called CWAB, translated into Chinese as collision warning and automatic braking systems. The system was first used in the 2006 Volvo S80 sedan, then the system is called ldquo; Collision Warning with Brake Supportrdquo ;, with Auto Brake does not function. It works by monitoring the traffic situation in front of the vehicle by the radar head. If there is danger of a collision, will be projected on the windshield out warning signals, braking immediately prompt the driver, while the brake caliper brakes will push the brake pads closer to, but does not apply a braking force, but the driver brakes action provides the fastest speed of response.

In 2007 the system was upgraded to become the now called ldquo; Collision Warning with Brake Assistrdquo; arguably should abbreviated ldquo; CWBArdquo ;, but VOLVO The official abbreviated ldquo; CWABrdquo ;. The system and the difference before the system is the addition of an automatic braking function, i.e. when the driver does not respond to the alert, the system detects the collision with the preceding vehicle has been inevitable, then the vehicle will be automatically braked. The net effect is that the vehicle will collide at a relatively low speed of the vehicle in front occur.

“windshield detector.”

“warning lights”


Honda’s CMBS (Collision Mitigation Brake system) system, originally developed began in 2003, initially equip the US version of the Accord, and then start on some models of Acura (including RL, MDX and ZDX) equipment. This Honda developed their own ldquo; collision mitigation brake system rdquo; The main principle is that when the millimeter-wave radar to detect vehicles ahead, judge risk of rear-end alarm alerts the driver with a way to continue to be close to the vehicle in front gently braking to bodily sensations warning. When it is judged difficult to avoid rear-end collision, CMBS braking will take strong measures, and drivingReducing the braking member with its rear-end speed, in order to effectively prevent and reduce damage to assist the driver when the rear-end once.

“Acura MDX”

When the speed of the vehicle where the driver is higher than 10 miles (15 km), CMBS system startup, the sensor for detecting the distance between the vehicle in front of the front, when the rear-end system that may cause, in addition to alert the driver and the brake outside, will automatically tighten the seat belt (E – pretensioner system) to ensure that binding effect on the front passenger. Meanwhile, when the vehicle automatic braking, brake lights will be lit, the car keep a safe distance when prompted. When the gap between the vehicle and the preceding vehicle speed is less than 10 miles (15 km), this system will not work.

Since the information collected from sensors front, therefore in front of the probe on ice, mud must be promptly cleaned, nor can cover other objects, otherwise the system will automatically shut down CMBS. In extreme cases abnormal congestion, off-road, mountain, etc., the CMBS system may also be manually closed, and displayed in the dashboard above. Meanwhile, when the VSA and other active safety systems shut down, CMBS is turned off and will be displayed.

at the 2011 Frankfurt Motor Show Honda introduced the European version of the ninth generation Civic, in addition to the front and open the hatchback design is more movement, it has been equipped with Honda’s CMBS system that can effectively improve traffic safety of the vehicle.

“European version of the ninth generation Civic models.”

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