I-sensor yoxinzelelo lokungenisa umoya (iManifoldAbsolutePressureSensor), emva koko ebizwa ngokuba yiMAP. Iqhagamshelwe kwi-incanation manifold ngetyhubhu ye-vacuum. Ngemithwalo eyahlukeneyo yesantya senjini, inokuva utshintsho lwe-vacuum kwi-incanation manifold, ize iguqule utshintsho lokumelana ngaphakathi kwi-sensor ibe yisignali ye-voltage, enokusetyenziswa yi-ECU ukulungisa ubungakanani be-injection kunye nexesha lokutsha.
Kwinjini ye-EFI, isenzi soxinzelelo lokungenisa sisetyenziselwa ukubona umthamo wokungenisa, esibizwa ngokuba yi-D injection system (uhlobo loxinano lwesantya). Isenzi soxinzelelo lokungenisa sifumanisa umthamo wokungenisa awubonwa ngokuthe ngqo njengesenzi sokungenisa, kodwa ubonwa ngokungathanga ngqo. Kwangaxeshanye, sichaphazeleka zizinto ezininzi, ngoko ke kukho iindawo ezininzi ezahlukeneyo ekufumaneni nasekugcinweni kwesenzi sokungenisa, kwaye impazamo eveliswayo nayo inezinto zayo ezikhethekileyo.
I-input pressure sensor ibona uxinzelelo olupheleleyo lwe-input manifold engasemva kwe-throttle. Ibona utshintsho loxinzelelo olupheleleyo kwi-manifold ngokwesantya senjini kunye nomthwalo, ize iyiguqule ibe yi-signal voltage ize iyithumele kwiyunithi yokulawula injini (ECU). I-ECU ilawula ubungakanani be-fuel injection esisiseko ngokobukhulu be-signal voltage.
Kukho iintlobo ezininzi zee-inlet pressure sensors, ezifana nohlobo lwe-varistor kunye nohlobo lwe-capacitive. I-Varistor isetyenziswa kakhulu kwinkqubo ye-D injection ngenxa yeenzuzo zayo ezifana nexesha lokuphendula ngokukhawuleza, ukuchaneka okuphezulu kokufunyanwa, ubungakanani obuncinci kunye nokufakelwa okuguquguqukayo.
Umfanekiso 1 ubonisa unxibelelwano phakathi kwe-varistor intake pressure sensor kunye nekhompyutha. Umfanekiso 2 ubonisa umgaqo wokusebenza kwe-varistor type inlet pressure sensor, kwaye u-R kumfanekiso 1 zii-strain resistor R1, R2, R3 kunye no-R4 kumfanekiso 2, ezenza i-Wheatstone bridge kwaye zidibene kunye ne-silicon diaphragm. I-silicon diaphragm inokuguquka phantsi koxinzelelo olupheleleyo kwi-manifold, nto leyo ebangela utshintsho kwixabiso lokumelana kwe-strain resistance R. Okukhona uxinzelelo olupheleleyo luphezulu kwi-manifold, kokukhona i-silicon diaphragm iguquka kwaye kokukhona utshintsho kwixabiso lokumelana kwe-resistance R lukhulu. Oko kukuthi, utshintsho lwe-mechanical lwe-silicon diaphragm luguqulwa lube ziimpawu zombane, ezikhuliswa yi-integrated circuit kwaye emva koko ziphume kwi-ECU
