Collision detection
Shock Sensor:
Shock sensors are installed in the front of the car and on the sides. When the ignition is turned on, the control unit for the driver and passenger protection system (RCM) supplies power to the shock sensors, which perform a self-diagnostic procedure. After passing through the self-diagnosis procedure, the impact sensors constantly send the "digital acceleration" message to the control unit of the passive safety system. Thanks to this use of several sensors, a faster activation of the airbags is achieved, since the longitudinal and lateral acceleration is detected more quickly. In addition, the accuracy of hit detection is improved.
Each impact sensor includes an accelerometer and a microchip, powered by the driver and passenger protection system control unit. The amount of lateral acceleration upon impact is calculated by a microchip and transmitted to the RCM. Based on this information, the RCM decides whether the airbags and pretensioners need to be activated.
If a fault is detected in itself, the corresponding sensor sends a fault message to the SRS control unit instead of the "digital acceleration" message. The RCM stores the appropriate DTC and illuminates the airbag warning light. DTCs can be retrieved from the RCM using a Land Rover approved diagnostic system via a high speed CAN bus connection.
Monitoring the condition of the driver and passengers
Cars are equipped with two types of control systems:
- For North America, set passenger classification system.
- For markets other than North America and Australia, the passenger presence detection system.
Comments on this article