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Notas de Aplicação
Measuring Engine Performance with Keysight USB DAQ Modules
Testing of engine performance is often important in the development of engine and fuel technologies. Many parameters affect an engine’s performance: the basic engine design, compression ratio, valve timing, ignition timing, fuel, lubricant, and temperature.
The most critical factor governing an engine’s power, fuel consumption and emissions is the amount of fuel consumed relative to the amount of air ingested. This is expressed as the air/fuel ratio; that is, the mass of air used divided by the mass of fuel burned. Larger engines typically have computer-controlled fuel injection governing the air/fuel ratio while smaller engines still use carburetors for controlling the air/fuel ratio. Proper tuning of an engine’s carburetor requires careful measurements of torque, speed, temperature, and fuel consumption as a function of throttle position. Keysight Technologies, Inc.’s USB data acquisition (DAQ) modules provide an inexpensive, flexible solution for engine testing.
To test engine performance in the laboratory, the engine is coupled to a dynamometer, which may be either an engine dynamometer (connected directly to the engine output shaft) or a chassis dynamometer (connected to the drive wheels). The dynamometer, which provides a load to the engine, can be easily controlled to allow testing under a wide range of speeds and torque.
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