MRS/MRS II Deployment Logic

MRS/MRS II DEPLOYMENT LOGIC
The design of the MRS/MRS II allows the control module to trigger deployment of the airbags/seat belt tensioners individually as needed. The logic is based on:
- The severity of the impact
- The direction of the impact (front/side/rear)
- The status of the front passenger's seat
- The status of the seatbelt contacts for the driver and passengers

DRIVER'S FRONT AIRBAG
The deployment threshold for the driver's front airbag is designed so that minor impact forces, will not trigger the airbag, where the seat belt is sufficient to protect the driver. If the seat belt is not connected, the driver's front airbag will deploy to provide the driver with protection.

PASSENGER'S FRONT AIRBAG
The passenger's front airbag is dependent on the seat belt contact arid the signal from the SBE for its deployment. If the passenger's seat is unoccupied, the airbag will not deploy unless a severe collision occurs.

SIDE AIRBAGS/ITS
The triggering of the side airbags/ITS depends on the degree of lateral acceleration as detected by the side impact sensors. An acceleration sensor in the control module acts as a plausibility check for side airbag/ITS deployment. Both sensors must detect that the trigger threshold has been exceeded before the airbags/ITS will deploy. The control module also looks at the signal from the SBE for deployment of the passenger's side airbag/ITS.

PYROTECHNIC SEATBELT TENSIONERS
The triggering of the seatbelt tensioners is dependent on the seatbelt contacts. The tensioners will not deploy if the seatbelts are not connected.

The safety logic of the MRS/MRS II will deploy the airbags in an accident if faults are detected with the SBE or seatbelt contact inputs.

BST TRIGGER LOGIC
Triggering of the BST requires no additional sensors. The MRS II control module will trigger the BST as follows:

FRONTAL COLLISION: During a frontal collision that involves deployment of any front air bag, the BST will also be triggered

SIDE IMPACT: Depending on the severity of the side impact, the BST may also be activated.

REAR IMPACT: Detection of server rear impact will cause the MRS II to activate the seat belt tensioners and simultaneously activate the BST.