The cruise control system was developed in 1945. The inventor was a blind man named RalphTeetor, who drove him to develop this system. The reason is that he speaks to the driver quickly and slowly. This experience made him very unhappy. So I developed cruise control in a rage.
Adaptive cruise _ history is not that long, it is developed on the basis of constant speed cruise _.
At the end of last century, millimeter-wave radar was gradually applied to automobiles since it was applied to navigation and aviation. Because millimeter wave radar can measure the distance, speed and speed of square objects, ACC adaptive cruise technology was born slowly.
Regarding the working principle of adaptive cruise, distance sensors (at present, there are radar, ultrasonic ranging sensors, infrared ranging sensors, etc. ) installed in front of the vehicle, constantly scanning the road in front of the vehicle during driving, which is equivalent to having "double eyes" staring at the road in front, while the wheel speed sensor collects the speed signal. When the distance from the preceding vehicle exceeds _, ACC control unit can work in coordination with the anti-lock braking system and engine control system. If the preceding vehicle slows down and stops at a red light, the ACC system can also command the vehicle to slow down and stop with the preceding vehicle, or it can automatically start after the preceding vehicle starts to start. Then gradually accelerate to the set speed and drive at the set speed.
If you compare it with humans, it is actually very easy to understand. Sensors are equivalent to "eyes", control unit ECU is equivalent to "_ brain", actuators (brakes, gears, etc. ) are equivalent to "hands and feet."
Uncle Jiu deliberately experienced Tesla's adaptive cruise function _ times during the test drive, and the overall experience was not bad _, and it was relatively easy to drive _, but in the congested area, it was really bad to experience rapid acceleration and deceleration. Motion prediction and speed control are still not smart enough.
As for the development status of ACC cruise, a few years ago, only BMW 5 Series, Audi A6L, Mercedes-Benz S-Class, Volvo and other mid-to high-end cars had this kind of thing. However, with the rapid popularization of advanced assisted driving, many cheap cars are equipped with adaptive cruise systems. For example, Volkswagen Golf, Geely Job, Honda Civic, etc.
(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)