As the function of ADAS, AEB hardware includes three parts: sensor, controller and actuator, as shown in Figure 2.
Fig. 2AEB system composition
1)? sensor
At present, the environmental sensors used in AEB mainstream scheme are millimeter-wave radar and camera: millimeter-wave radar can obtain the distance, speed and angle of the target object by transmitting electromagnetic waves to the target object and receiving echoes; The camera needs to identify the target first, and then estimate the target distance according to the pixel size of the target in the image. There are three specific configurations, as shown in Table 3.
Watch? Configuration scheme of 3AEB sensor
Function/Scenario Comparison of Scheme Environment-Aware Sensors
Millimeter wave radar camera
Scheme 1 √ Urban scene and suburban scene
Scheme 2 √ Urban landscape, suburban landscape and pedestrian protection
Scheme III √√ Urban landscape, suburban landscape and pedestrian protection
2)? controller
At present, AEB controllers are mostly integrated in sensors (mostly millimeter-wave radars). With the continuous development of intelligent driving technology, the AEB control function will be gradually assumed by the domain controller.
3)? actuating mechanism
At present, the actuators of AEB are all ESC systems. With the gradual mass production of EHB system (Bosch ibooster), it will become a new AEB actuator, shortening the corresponding time of the actuator and improving the performance of AEB. 04AEB design concept
Frontal collision protection system is the general name of a series of driver assistance systems developed for longitudinal traffic accidents, and AEB belongs to some functions, as shown in Figure 4.
Under the current technical conditions, the design purpose of AEB system is not to ensure the rear-end collision of vehicles, but to play the role of response assistance and emergency assistance. Its design idea is as follows:
On the one hand, when the driver can't avoid the collision through his own ability, he can reduce the severity of the accident through system intervention; On the other hand, by reducing the speed, the driver can get more time, so as to take measures such as changing lanes to avoid collision.
In addition, the driver's subjective feeling of danger must be considered in the design of AEB to avoid customer complaints caused by frequent braking. Of course, AEB system can usually stop the vehicle at low speed in a simple environment to avoid collision.
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