Sensor ya mpweya wolowa (ManifoldAbsolutePressureSensor), yomwe imadziwikanso kuti MAP. Imalumikizidwa ku intake manifold ndi chubu cha vacuum. Ndi liwiro losiyanasiyana la injini, imatha kumva kusintha kwa vacuum mu intake manifold, kenako nkusintha kusintha kwa kukana mkati mwa sensor kukhala chizindikiro cha voltage, chomwe chingagwiritsidwe ntchito ndi ECU kukonza kuchuluka kwa jakisoni ndi nthawi yoyatsira.
Mu injini ya EFI, sensa ya kuthamanga kwa intake imagwiritsidwa ntchito kuzindikira kuchuluka kwa intake, komwe kumatchedwa D injection system (mtundu wa velocity density). Sensa ya kuthamanga kwa intake imazindikira kuchuluka kwa intake komwe sikudziwika mwachindunji monga sensa ya kuyenda kwa intake, koma kumazindikirika mwanjira ina. Nthawi yomweyo, imakhudzidwanso ndi zinthu zambiri, kotero pali malo osiyanasiyana pakuzindikira ndi kusamalira kuchokera ku sensa ya kuyenda kwa intake, ndipo cholakwika chomwe chapangidwa chimakhala ndi mawonekedwe ake.
Chojambulira mphamvu ya intake chimazindikira kupanikizika konse kwa intake manifold kumbuyo kwa throttle. Chimazindikira kusintha kwa kupsinjika konse mu manifold malinga ndi liwiro la injini ndi katundu wake, kenako chimasandutsa kukhala voteji ya chizindikiro ndikutumiza ku unit yowongolera injini (ECU). ECU imalamulira kuchuluka kwa mafuta oyambira kutengera kukula kwa voteji ya chizindikiro.
Pali mitundu yambiri ya masensa olowera mpweya, monga mtundu wa varistor ndi mtundu wa capacitive. Varistor imagwiritsidwa ntchito kwambiri mu D injection system chifukwa cha zabwino zake monga nthawi yoyankha mwachangu, kulondola kwambiri, kukula kochepa komanso kukhazikika kosinthasintha.
Chithunzi 1 chikuwonetsa kulumikizana pakati pa sensa ya varistor intake pressure sensor ndi kompyuta. Chithunzi 2 chikuwonetsa mfundo yogwirira ntchito ya sensa ya varistor inlet pressure sensor, ndipo R mu Chithunzi 1 ndi zotsutsana ndi strain R1, R2, R3 ndi R4 mu Chithunzi 2, zomwe zimapanga Wheatstone bridge ndipo zimagwirizanitsidwa pamodzi ndi silicon diaphragm. Silicon diaphragm imatha kusokonekera pansi pa black ya black mu manifold, zomwe zimapangitsa kusintha kwa resistance value ya strain resistance R. Kupanikizika kwakukulu mu manifold, kusinthasintha kwa silicon diaphragm kumakulirakulira komanso kusintha kwakukulu kwa resistance value ya resistance R. Ndiko kuti, kusintha kwa makina kwa silicon diaphragm kumasinthidwa kukhala ma signals amagetsi, omwe amakulitsidwa ndi integrated circuit kenako amatulutsidwa ku ECU.
