Air mass flow measurement of the intake air of combustion engines

Process data

Measuring task: Air mass flow measurement Intake air combustion engine

Measuring point: Intake side on engine block

Measuring range: Depending on motor type

Process pressure: Atmospheric suction

Process environment: ambient temperature

Application

The technical requirements for modern combustion engines continue to increase. Consumption is to be reduced, performance increased, and ideally with zero emissions. This poses major challenges for manufacturers. The legal conditions are becoming more and more stringent. High-precision measuring devices for the test benches are, of course, a must. The engine intake air flow measurement is one of the main applications here. High temporal resolution and very accurate measurements are required here. Depending on the engine type, also bidirectional and in different measuring ranges are necessary depending on the displacement.

Motor power testing stations for the automotive industry

For the determining the power balance of internal combustion engines requires accurate measurement of intake air mass flow and fuel consumption at a given power profile on the engine test bench. For the measurement of air mass on motor test stations, Höntzsch offers two instrumentation solutions.

The ExactFlow II based on the proven contamination-insensitive vortex principle for measurements on the automotive test bench where balancing without strong influence of transient flow changes is required. This system has been successfully used for years in the field of engine test beds for combustion engines by well-known manufacturers in the automotive industry. The ExactSonic P based on the transit time difference of ultrasonic signals. This low pressure loss and highly dynamic system offers a temporal resolution of 1 KHz when used on the test bench.

This system provides precise data on the test bench for optimizing intake ducts, valves and turbochargers. In addition, the system uses bi-directional measurement to detect the back flow in engines with a small number of cylinders and corrects the mass flow accordingly. With the ExactSonic P, line cross-sections of up to 300 mm can be realized as standard for engine test benches.

The connection to the measurement data acquisition of the test benches is made either via classic analogue outputs and or via TCP / AK protocol.