Adaptive cruise control is next evolutionary stage of development of accustomed cruise control. Its main difference is its ability to control traffic situation and adjust vehicle speed depending on movement speed of car in front.
• Functions of adaptive cruise control
• Purpose of ACC
• ACC operational principle
This device is very convenient for drivers and saves his/her pains while driving. ACC provides safety control by checking the distance to front car and keeps constant range.
Functions of adaptive cruise control
The advanced model of cruise control has an obvious advantage over its predecessor, which is capable only to maintain speed stated by driver. ACC can also change it one way or another inspecting traffic situation.
The ACC system is handy on free routs in long-distance travels as well as in heavy city traffic, which can turn into a traffic jam.
Purpose of ACC
System of speed control without driver intervention is known as Adaptive Cruise Control or ACC. It consists of:
• proximity sensor;
• electronic control module;
• actuation device.
The proximity sensor is needed for front car speed and distance identification. Radar or lidar (light detection and ranging) are basis of this sensor. It is mounted on radiator grille or bumper. It operates at range of 150m.
Electronic control module calculates speed of front car and distance to it by reading the information from other sensors. It also determines the most suitable speed for vehicle, steering wheel position, path of motion radius and sideward acceleration. Then it compares all these parameters with values stated by driver and program control. If necessary, the electronic control module signals to actuation devices maintaining normal movement speed.
The ACC system is not equipped with its own actuation devices.
ACC operational principle
The adaptive cruise control system functions at speed range from 30 to 180 km/h. But modern systems work from the moment of car movement to 200 km/h. Option StopAndGo is also included.
The ACC system provides vehicle movement in conditions of steady acceleration, speed maintaining and hindrance. If there are no other cars on the road, then cruise control maintains sped stated by the driver. While accelerating, the process of acceleration continues until reaching a stated speed.
Moving on a low speed, the hindrance is reached due to brake system, on high speed – due to power train derating and brake system, if necessary.