Temperature sensor system

Temperature sensor system

To ensure safe operation of the complete Clean Energy system, the BMW Hydrogen 7 vehicle requires optimised permanent temperature monitoring. This task is performed by the Clean Energy control unit (CESG) by monitoring nine temperature sensors distributed throughout the fuel supply system (KVA).

Temperature monitoring

In the BMW Hydrogen 7 vehicle, temperature sensors are fitted in the following positions:

• two sensors on the heat exchanger
  
• one sensor on the engine shutdown valve
  
• two sensors at the coolant inlet and outlet
  
• one sensor at the boil-off management
  
• one sensor on the venturi nozzle
  
• one sensor on the compressor
  
• one sensor on the tank coupling
  

Component diagnosis

The temperature sensors are subject to component monitoring by diagnosis. Within the framework of the test modules for these components, the following faults are covered:

• 6497 heat exchanger
  
• 649E temperature sensor at outlet of heat exchanger
  
• 6509 heat exchanger
  
• 649D temperature sensor, engine shutdown valve
  
• 6498 heat exchanger, coolant sensors
  
• 649A temperature sensor at coolant outlet
  
• 649B temperature sensor at coolant inlet
  
• 6493 boil-off operating point
  
• 649C temperature sensor at oxidator
  
• 64C7 temperature sensor at venturi nozzle inlet
  
• 64C6 temperature sensor, compressor
  
• 64D8 temperature sensor, tank coupling
  
• 64C5 temperature sensor at heat exchanger inlet