Object Detection Description and Operation (with Active Safety System - UGN)
Object Detection Description and Operation (with Active Safety System - UGN)
The Active Safety System analyzes data from various sensors and modules to provide multiple features. It is made up of the following components:
* Active safety control module
* Front view camera module
* Front long range radar
* Front left short range radar
* Front right short range radar
* Rear short range radar
* Front and rear parking assist system
* Parking assist switch
* Lane departure warning switch
* Active Safety Seat
The Active Safety Module provides the following features:
* Vehicle Ahead
* Forward Collision Alert
* Integrated Brake Assist
* Automatic Collision Preparation System
* Rear Emergency Automatic Braking
* Lane Departure Warning
* Adaptive Cruise Control
Component Descriptions:
Active Safety Control Module
The Active Safety Control Module analyzes data from various modules, sensors, and switches and provides enhanced safety features.
Front View Camera Module
The front view camera is located behind the windshield, looking out at the road ahead and detects lane markings and vehicles directly ahead, within a distance of approximately 60 meters (197 ft). The front view camera module is used for lane departure warning and forward collision alert systems.
Front Long Range Radar
The front long range radar looks forward and is used in the 30-200 meters (98-656 ft) range.
Front Left Short Range Radar
The front left short range radar detects objects out to approximately 30 meters (98 ft).
Front Right Short Range Radar
The front right short range radar detects objects out to approximately 30 meters (98 ft).
Rear Short Range Radar
The rear short range radar looks backwards and detects objects out to approximately 30 meters (98 ft). This signal along, with rear park assist, is used for rear emergency automatic braking.
Parking Assist System
Uses object sensors in the rear and front (if equipped) bumpers to provide distance measurements to nearby objects.
Parking Assist Switch
Parking assist can be activated or deactivated by pressing the parking assist switch.
Lane Departure Warning Switch
The lane departure warning system can be activated or deactivated by pressing the lane departure warning switch.
Active Safety Seat
The memory seat module controls the haptic alert provided by the seats. If an object is detected, the memory seat module will command pulses to the driver seat.
Vehicle Ahead
With input from the front camera module and front long range radar, the active safety control module will issue a command via serial data to turn on the green Vehicle Ahead Indicator. This is an indication that the Forward Collision System is active.
Forward Collision Alert
With input from the front camera module and front short and long range radars, the active safety control module evaluates collision threats in the vehicle's forward path and alerts the driver of a potential collision. Alerts will only be possible if the system has detected a vehicle ahead and turned on the green Vehicle Ahead indicator. The active safety control module will send a command via serial data to turn on the forward collision alert telltale when approaching a vehicle directly ahead too quickly. The active safety control module will also send a command via serial data to pulse the driver seat (if equipped) or create a beeping noise through the speakers when approaching a vehicle directly ahead too quickly.
Integrated Brake Assist
With the input from the front camera module, front long range radar and front short range radar, the active safety control module provides a boost to the driver's commanded braking as much as is needed to potentially avoid a frontal impact. Integrated brake assist may activate when the brake pedal is applied quickly by providing a boost to braking based on the speed of approach and distance to a vehicle ahead. The driver can override this behavior by releasing the brake pedal or pressing the accelerator pedal.
Automatic Collision Preparation System
Note: Automatic braking applies the brakes in many imminent front-end crash situations to help reduce crash damage. It may even help avoid some crashes at very low speeds.
With the input from the front camera module, front long range radar and front short range radar, the active safety control module automatically applies the brakes to reduce the impact speed when a front collision is imminent. Once the collision is deemed unavoidable, if the driver still does not react more aggressively, braking is applied automatically.
Rear Emergency Automatic Braking
With the input from the rear short range radar and park assist system, the active safety control module attempts to avoid imminent collision by automatically braking the vehicle when going in reverse. Two levels of warning are used to encourage the driver to take control. The first level will pulse the left and right sides of the seat twice (if equipped) or beep once when an object is first detected. When the system detects a potential crash, the second level will provide five pulses on the left and right sides of the driver seat or five beeps, and there may be a brief, sharp application of the brakes.
Some vehicles are equipped with the rear automatic braking system which is designed to help avoid or reduce the harm caused by backing crashes. If the system detects the vehicle is backing too fast to avoid a crash, it may automatically brake hard to a stop.
Pressing the brake pedal after the vehicle comes to a stop will release the rear automatic braking. Also, when it is safe to do so, pressing the accelerator pedal firmly at any time will override the rear automatic braking.
Lane Departure Warning
With input from the front camera module the active safety control module will issue a warning via serial data to turn on a lane departure warning (LDW) telltale when the system detects that the vehicle has unintentionally crossed a lane marking. In addition an audible alert or haptic alert will signal the driver the vehicle has unintentionally left the lane. The memory seat module will command three pulses to the left or right side of the seat depending on the lane departure direction. The front view camera is located behind the windshield, looking out at the road ahead and detecting any lane markings. The system can be turned off by using the LDW disable switch.
The LDW telltale will be illuminated green when the system is ready to assist and will be a flashing amber color when crossing the lane unintentionally.
Adaptive Cruise Control
The front long range, front short range radar, and front view camera scans the road environment to detect targets within its specified field of view. With input from the front radars and front view camera the active safety control module controller then makes throttle and/or brake commands to the engine control module (ECM) and electronic brake control module (EBCM) via the serial data circuit in order to control the vehicle acceleration/deceleration based on the data from the radar. The ECM and EBCM provide throttle control and automatic braking needed for proper cruise speed adjustment.
Active cruise control allows a driver to set and maintain a following distance to the preceding nearest vehicle in the path ahead. The active safety control module controller calculates a follow speed limit to ensure an acceptable distance is maintained to the preceding vehicle in front, should one be present. The adaptive cruise control system automatically adjusts the speed when the vehicle comes up behind a slower travelling vehicle in front. The system applies limited automatic braking and throttle control without driver input when necessary to maintain the set following distance. The preceding vehicle's speed and acceleration along with the active cruise control vehicle speed and acceleration and the distance between the 2 vehicles are factors used by the active safety control module controller to determine the follow speed limit. The vehicle speeds up to the original driver selected set speed when the pathway becomes clear without driver input.
Instrument Cluster Display Messages
If there is a DTC set in any of the modules in the system, the active safety control module will send "Service Driver Assist" to the instrument cluster to alert the driver of a problem with the system. No other specific details are given unless the driver attempts to activate a specific system. For example if the driver attempts to turn on Lane Departure Warning, the instrument cluster will display "Lane Departure Unavailable" and the indictor will flash and then go out.