Bosch Carbon Dioxide Sensor Saves Fuel
Bosch has developed a new Climate Control Sensor (CCS) that monitors the level of carbon dioxide (CO2) in a vehicle’s passenger compartment while increasing the efficiency of the air conditioning system. The result is an enhanced electronic control of the air conditioning system and a corresponding reduction in energy demand.
 When fresh air is fed into the passenger compartment, the CCS-controlled air conditioning system switches to recirculation mode. This mode saves energy because the amount of power needed for cooling is reduced. Using less power for cooling requires less load on the engine, which drives the air conditioning compressor. Bosch engineers calculate fuel savings of up to 10 percent when the system is operating in maximum cooling mode.
 The robust and compact CCS uses infrared-based spectroscopy to measure CO2 levels in the air. This system can reliably measure even minute concentrations of less than 0.02 percent by volume. The sensor constantly measures the CO2 level of the air in the passenger compartment, while an enhanced version also measures air humidity and temperature. This data is used to precisely control all the actuators of the air conditioning system and provide for a balanced management of air recirculation.
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