Gateway
Gateway
Databus Systems
The gateway manages and routes all messages across bus segments for the following bus interfaces.
The LIN interfaces are designed as LIN master interfaces. These LIN interfaces are intended for the connection of a battery sensor, the 12 V DC/DC converter, the generator and a main power distributor. Energy management on the gateway can use the battery sensor to call up various battery characteristics, e.g. voltage, battery charging condition etc., and if required switch off the control units in the vehicle electrical system. For this purpose, the gateway sends the relevant switch-off messages, e.g. via the same LIN bus, to the main power distributor.
Wake-up functions
The "Vehicle Network State Manager" of the gateway is a sub-function of network power management and controls the entire vehicle bus communication centrally with respect to wake-up and power-down for Terminal 15 "off".
After Terminal 15 "off", all control units send out their sleep readiness. To ensure that the individual bus systems are then switched to sleep mode sequentially rather than in an uncontrolled manner, the "Network Vehicle State Manager" in the gateway controls and monitors the individual network transition points in bus idle. In this context, the gateway sends out its sleep readiness to the individual networks according to a predefined sequence (rules).
The same applies in reverse for waking. When a network is woken up by a connected control unit, the gateway wakes up the other networks in this state. The networks then "fall asleep" again as described above.
Other functions
The gateway also supports AfterSales Service in vehicle fault finding by providing comprehensive system and diagnostic functions for monitoring network communi - cation.
The gateway provides vehicle energy management as an additional function. This function supports optimisation of battery charging during driving as well as minimization of the closed-circuit current by switching off comfort functions and networks when the vehicle is stationary.