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What is the CFV System?

1 Answers

SophieLynn

07/29/25 10:51pm

With the national governance of automobile engine emission pollutants and the establishment of emission regulations, emission testing has become increasingly important. This article focuses on the study of the Constant Volume Sampling (CVS) device in the emission testing and analysis system. It introduces the critical flow venturi (CFV), a key component in CVS, discusses its design principles, calculation process, and accuracy calibration, and briefly describes the functions of other components in CVS. The automotive CFV is an ECU control system for natural gas engines. Pressing the dedicated CFV switch can activate this natural gas engine system. The specific operation steps are as follows: 1. Depress the car's brake pedal. 2. Press the car's one-touch start button. 3. The car's dashboard lights up, and the vehicle's power is turned on. 4. Press the CFV button located inside the car to activate the vehicle's natural gas mode. 5. At this point, the car's fuel economy will improve.

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