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Title: Flowmeters Used In Internal Combustion Engines
Author: Vulko m. Kichev
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Due to the small flows running through the feed system of the internal combustion engines, the need for high precision of measuring the operation requires the use of only a few methods for flow-rate measuring known today. The supersonic phase measurement, the elastic suspention local resistance, the tachometer method, the chamber flowmeters and the hot-wire anemometers are of great significance. This paper studies and makes an evaluation of the accuracy of suitable methods and gauges for measuring the fuel consumption of internal combustion engines. The gauges considered here are mainly intended for use in vehicles, where the compactness and reliability of the measuring gauge are of primary importance. In flows running through the fuel-charging pipe from 0,5 to 5 A 20 cm /s, when using supersonic phase measuring, in order toobtain the required difference of lc, the generator freguency has to be over 2 MHz, which will make the comparing device work under hard operating conditions, thus making the equipment more expensive. The elastic suspension local resistance gauges possess distinct dynamic characteristics and meet the requirements for compactness and reliability of the measuring system. The accuracy of this type of gauges is in the range between 0,2 and 0,5% The turbine flowmeters are inaccurate for small flows at idle run of the internal combustion engines. The error in the range lowest limit exceeds 10%. The chamber flowmeters provide the required accuracy of measurement and are suitable for the purpose. Hot-wire anemometers may also ensure high precision if some corrections are made, but their software is too sophisticated and expensive.

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