Deployment

Deployment
For the deployment output stages to be activated, the appropriate signals must be received from two different sensors, i.e. the B-pillar satellite and the MRS control unit sensor.
In electrical-system statuses from Terminal R ON onwards, the MRS4RD control unit is supplied with power and is ready for operation on completion of the predrive check. The deployment capacitor, which acts as a power reserve, is charged to approximately 26 V via a switching regulator. The deployment capacitor provides the backup power supply in the event of a crash in which the battery power supply is cut off.
The deployment capacitor, which provides the deployment power for the deployment output stages is controlled by a safety switch (trigger switch). The safety switch is operated by the microprocessor.
The deployment output stages consist of a highside and a lowside power switch. The highside power switch switches the deployment current and the lowside power switch switches the earth current. The highside and lowside power switches are also used to check the deployment circuits as part of the predrive check.
The incoming sensor signals are analyzed by the analyzer module and passed on to the microprocessor. The microprocessor performs the deployment algorithm calculations. The calculation results are compared with the event/deployment matrix and a decision reached as to the deployment of the various detonator pellets.