What is the vehicle collision warning system
The vehicle anti-collision warning system is mainly used to help drivers avoid major traffic accidents such as high-speed and low-speed rear end collision, unconscious lane departure at high-speed, collision with pedestrians and so on. Like the third eye, it helps the driver continuously detect the road conditions in front of the vehicle. The system can identify and judge various potential dangerous situations, and help the driver avoid or slow down collision accidents through different sound and visual reminders.
Automobile collision warning system
Composition of automobile anti-collision early warning system
Signal acquisition system: adopt millimeter wave radar, laser, sonar, infrared, camera and other technologies to automatically measure the speed of the vehicle, the speed of the vehicle in front and the distance between the two vehicles;
Data processing system: after the computer chip processes the distance between the two vehicles and the instantaneous relative speed of the two vehicles, it judges the safe distance between the two vehicles. If the distance between the two vehicles is less than the safe distance, the data processing system will send instructions; The other is that the computer chip calculates the two vehicle collision time (TTC) to calculate the degree of danger, and then makes alarm and braking instructions.
Actuator: it is responsible for implementing the instructions sent by the data processing system, giving an alarm and reminding the driver to brake. If the driver fails to execute the instructions, the actuator will take measures, such as closing the window, adjusting the seat position, locking the steering wheel, automatic braking, etc.
Automobile collision warning system
Function overview of automobile anti-collision early warning system
Vehicle distance monitoring and early warning: the system continuously monitors the distance from the vehicle in front, and provides three levels of vehicle distance monitoring alarm according to the proximity to the vehicle in front;
Vehicle crossing warning: when the turn signal is not turned on, the system generates a crossing alarm about 0.5 seconds before the vehicle crosses various lane lines;
Forward collision warning: the system warns the driver of the imminent collision with the vehicle in front. When the possible collision time between the vehicle and the vehicle ahead at the current driving speed is within 2.7 seconds, the system will generate audible and visual warnings;
Functions of automobile anti-collision warning system
Technical principle of vehicle mounted millimeter wave radar
After using the antenna to transmit electromagnetic wave, the vehicle mounted millimeter wave radar continuously detects the echo reflected by the front or rear obstacles, makes comprehensive analysis through the radar signal processor, calculates the relative speed and distance with the front or rear obstacles, and generates warning information and sends it to the vehicle control circuit, The automobile control circuit controls the automobile transmission and brake to make response actions, so as to avoid collision.
Meter wave radar has the characteristics of stable detection performance, long operating range and good environmental applicability. Compared with ultrasonic radar, millimeter wave radar has the characteristics of small volume, light weight and high spatial resolution.
Vehicle mounted millimeter wave radar technology
At present, the principle and application of millimeter wave radar technology
Millimeter wave radar is a microwave radar sensor specially used for motor vehicle driving assistance system ADAS. It is mainly used for active collision avoidance or pre collision system, automatic emergency braking system, adaptive cruise system, blind spot detection, front and rear collision warning, lane change assistance, offset warning system, TTC safe distance warning and rear transverse traffic warning, Assist the motor vehicle to complete the obstacle avoidance function.
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