“Exhaust gas temperature gauge”的意思、由来-开放百科全书

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Exhaust gas temperature gauge

释义

Applications
Oxygen sensor
Advanced tuning
References
External links

An exhaust gas temperature gauge (EGT gauge) is a meter used to monitor the exhaust gas temperature of an internal combustion engine in conjunction with a thermocouple-type pyrometer. EGT gauges are found in certain cars and aeroplanes. By monitoring EGT, the driver or pilot can get an idea of the vehicle's air-fuel ratio.

At a stoichiometric air-fuel ratio, the exhaust gas temperature is different from that in a lean or rich air-fuel ratio. At rich air-fuel ratio, the exhaust gas temperature either increases or decreases depending on the fuel. High temperatures (typically above {{convert|1600|F|C|disp=or|sigfig=1}}) can be an indicator of dangerous conditions that can lead to catastrophic engine failure.

Applications

EGT meters are used for tuning turbo-equipped cars. If the sensor is installed at the manifold collector before the turbo, the turbine inlet temperature can be monitored. If the sensor is installed after the turbo, the exhaust temperature can be monitored. Because EGT typically drops {{convert|200|-|300|F-change}} across the turbine, installers try to put the thermocouple as close to the cylinder head as possible to give a true reading, and a reading that will react faster to the engine's condition compared to an installation after the turbo.
Air-cooled engines, like used in Volkswagen, Porsche and other cars can be damaged by over heating. An exhaust gas temperature gauge can be used to prevent damage.^[1]
Air-cooled motorcycle engines also can be damaged by over heating.

Oxygen sensor

Using an EGT meter alone is considered an older technique for getting the most out of petrol and diesel engines, as a gauge-type wideband digital oxygen sensor can be purchased for about the same price, or for a little more. However, some advanced racers will use EGT gauges in combination with a wideband oxygen sensor to 'lean' the fuel ratio a bit to safely raise the temperature for more power.

Advanced tuning

Though by tuning primarily by EGT and air fuel ratio values, EGT is still to this day a used data output for engine tuning. When fine tuning an engine, if possible with the ECU manipulation with the cylinder's timing can be made. By adjusting the timing, the resultant cylinder temperature can be used to improve cylinder efficiency. Though this is still widely done, EGT values should be used as a safe guard sensor measure and as a tuning guide. [1]

References

1. ^{{cite web|url=https://uh.edu/engines/epi2558.htm|title=No. 2558: Cooled by Air or Water|author=|date=|website=uh.edu|accessdate=30 April 2018|deadurl=no|archiveurl=https://web.archive.org/web/20170809234658/http://www.uh.edu/engines/epi2558.htm|archivedate=9 August 2017|df=}}

www.fku.com

External links

Benefits of individual cylinder tuningSensors{{Sensors}}{{technology-stub}}

2 : Engine technology|Engine sensors

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