Adaptive Cruise Control (ACC) System Description

Function

The ACC system uses the multipurpose camera unit and the millimeter radar to calculate and adjust the vehicle speed to maintain the appropriate distance between your vehicle and the leading vehicle based on your vehicle speed and driving conditions. When another vehicle cuts in between your vehicle and the leading vehicle, the system switches the target vehicle to a new vehicle using the image information (vehicle and lane information) from the multipurpose camera. When the leading vehicle changes the lane or goes out of the detection range, the vehicle drives at the preset vehicle speed until detecting a new target vehicle. ACC system works with the cruise control system to adjust the vehicle speed.

The cruise control mode can be entered by operating the distance switch while the ACC is working.

Control Block Diagram

Operation Conditions

Control vehicle speed		Set speed range: 25 - 90 mph (40 - 145 km/h)
Maximum acceleration		0.1 G
Maximum deceleration		0.3 G
Left/right detection angle of millimeter wave radar		±15 degrees
Up/down detection angle of millimeter wave radar		±2 degrees
Detection object		Vehicle only

Basic Controls of ACC System

	ACC system uses the millimeter wave radar to detect the leading vehicle, determines the target vehicle and measures the distance to the target vehicle, and its vehicle speed (the system also uses the multipurpose camera as needed to determine the target vehicle based on the lane and vehicle position information).
	When there is no leading vehicle, your vehicle drives at the preset speed.
	When there is a leading vehicle, your vehicle follows the vehicle and drives within the preset speed.
	If the vehicle ahead pulls over out of the way, the ACC accelerates the vehicle to the set speed and maintains that speed.
	If the ACC detects a slow vehicle and the distance to the vehicle ahead is closing, the vehicle speed is reduced primarily by closing the throttle, and additional slowing is accomplished by using the brakes. If the vehicle ahead is too close, an alarm sounds.
	If a slower vehicle ahead accelerates, the throttle is opened to accelerate the vehicle (up to the set speed) to maintain the following interval.

Driving pattern example:

The system estimates the driving course based on your vehicle speed and yaw rate and detects a vehicle that enters the camera range and differentiate it from the leading vehicle using the lane and leading vehicle information from the multipurpose camera.