2013年10月23日星期三

Differential pressure sensor applications

Pressure sensors are widely used in central air conditioning, underground ventilation , boiler air supply , building automation, laboratory air pressure requirements , such as wind power wind pipe , fire engineering field of indoor air pressure control , the coal industry pressure processes. Also known as : air pressure sensor, pressure difference Automotive Temperature Sensors, wind pipe pressure sensor, indoor air air pressure sensor and so on. For measuring the automobile engine exhaust particulate filter (DPF) pressure difference before and after the exhaust channel . In order to meet emission standards , the usual method is placed in the vehicle exhaust emissions portion trap , trap tiny particles in the exhaust gas . The drawback of this method , the exhaust gas discharge passage is the accumulation of the particles trapped as being gradually blocked. Remove these particles accumulate is a location in the channel or directly in extra fuel into the exhaust gas to increase the exhaust gas temperature , in the presence of a catalyst in the trap , the exhaust gas temperature sufficient to allow the accumulated particulate combustion and gasification . This cleaning process is called "regeneration " procedure. This process there is a problem , "regeneration" process too frequently , will increase fuel consumption ; interval is too long , it will reduce engine performance. Thus, a reasonable choice of "regeneration" trigger time is very important to the pressure differential Camshaft Positioning Sensorsignal to ECU, ECU according to the pressure difference determines the accumulation of particulate trap level decision " regeneration" trigger time and the additional amount of fuel injected . Meanwhile , ECU EGR valve can be adjusted by controlling the temperature of the exhaust gas . In addition , differential pressure Engine Coolant Temp Sensor can also be used to measure gas flow , liquid level and so on. Gas flow measuring method, the flow tube and the atmospheric pressure difference between the pressure , static pressure derived flow tube , the flow rate is proportional to the square root of the static pressure , so as to arrive traffic. Determination of high and low level , low level of the pressure value measured , according to the density of the liquid , the conversion of the liquid level .

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