Safety and Gateway Module Sgm

Safety and Gateway Module SGM





The SGM is a combination of the Safety Information Module (SIM E65) and the Central Gateway Module (ZGM E65). The SGM uses the software of the ZGM, and carries out the ZGM functions. The functions of the SIM have also been integrated and a number of new functions added.
The Safety and Gateway Module is responsible for the following functions:
^ Voltage supply of the satellites
^ Provision of the 60 V energy reserve (SIM 400 V) in the event of failure of the power supply during an accident
^ Function of the star coupler and the bus master of the byteflight
^ Gateway function to the other bus systems KCAN, PTCAN and diagnostic bus
^ The history memory has been integrated into the SGM
^ Provision of the crash telegram for activating various functions in other systems (see Gateway functions)
^ Drive for the Servotronic valve in the power assisted steering
^ Drive for the ECO valve of the hydraulic pump
The Safety and Gateway Module is in the module carrier behind the glove compartment and has been adapted to the ASK system.
The modules of the ZGM have been accommodated on the printed circuit board of the SIM. The ZGM has its own microprocessor and its own diagnosis address. An electrical connection takes the place of what was formerly the fiber-optic connection between ZGM and SIM. A byteflight controller is used to transmit the same telegrams as are used for communication by means of an optical link.

Note: As far as diagnosis is concerned, note that two control units are addressed, despite the fact that they share a common housing.