Adaptive Cruise Control
ADAPTIVE CRUISE CONTROL SYSTEM
ABSTRACT
ACC is an extension of conventional cruise control system. An ACC system is a driver convenience system which automatically adjusts the vehicle speed and distance to that of a target vehicle. ACC uses a long range RADAR/LIDAR sensor to detect a target vehicle up to 200 meters in front and automatically adjusts the ACC vehicle speed and gap accordingly. ACC automatically decelerates or accelerates the vehicle according to the desired speed and distance settings established by the driver. The RADAR/LIDAR sensors are located under or behind the front bumper or behind the grille.
1. INTRODUCTION
A typical conventional cruise control system is basically a speed control system of a vehicle. It controls the vehicle speed by adjusting throttle position to maintain a speed set by the driver. A control unit compares the actual vehicle speed and the desired set speed. If there is a difference between these two values, a signal is sent to a throttle position actuator to adjust the throttle position to bring the vehicle to the set speed. Depending on the vehicle make and model, throttle position is achieved using vacuum powered or electronically controlled actuators.
2. ACC VEHICLE RELATIONSHIP
3. ACC SYSTEM STATES * ACC off state- direct access to the ‘ACC active’ state is disabled.
* ACC standby state- system is ready for activation by the driver.
* ACC active state- the ACC system is in active control of the vehicle’s speed.
* ACC speed control state- it’s an ‘ACC active’ state in which no forward vehicles are present such that the ACC system is controlling vehicle speed to the ‘set speed’ as is typical with conventional cruise control systems.
* ACC time gap control state- it’s an ‘ACC active’ state in which time gap or headway between the ACC vehicle and the target vehicle is being controlled.
ACC States and Transitions
4. FEATURES OF ACC
ABSTRACT
ACC is an extension of conventional cruise control system. An ACC system is a driver convenience system which automatically adjusts the vehicle speed and distance to that of a target vehicle. ACC uses a long range RADAR/LIDAR sensor to detect a target vehicle up to 200 meters in front and automatically adjusts the ACC vehicle speed and gap accordingly. ACC automatically decelerates or accelerates the vehicle according to the desired speed and distance settings established by the driver. The RADAR/LIDAR sensors are located under or behind the front bumper or behind the grille.
1. INTRODUCTION
A typical conventional cruise control system is basically a speed control system of a vehicle. It controls the vehicle speed by adjusting throttle position to maintain a speed set by the driver. A control unit compares the actual vehicle speed and the desired set speed. If there is a difference between these two values, a signal is sent to a throttle position actuator to adjust the throttle position to bring the vehicle to the set speed. Depending on the vehicle make and model, throttle position is achieved using vacuum powered or electronically controlled actuators.
2. ACC VEHICLE RELATIONSHIP
3. ACC SYSTEM STATES * ACC off state- direct access to the ‘ACC active’ state is disabled.
* ACC standby state- system is ready for activation by the driver.
* ACC active state- the ACC system is in active control of the vehicle’s speed.
* ACC speed control state- it’s an ‘ACC active’ state in which no forward vehicles are present such that the ACC system is controlling vehicle speed to the ‘set speed’ as is typical with conventional cruise control systems.
* ACC time gap control state- it’s an ‘ACC active’ state in which time gap or headway between the ACC vehicle and the target vehicle is being controlled.
ACC States and Transitions
4. FEATURES OF ACC