Cov pa roj recirculation (EGR) valve plays lub luag haujlwm tseem ceeb hauv lub tsheb lub emission control system. Nws lub luag haujlwm tseem ceeb yog tswj xyuas cov pa tso pa nkag mus rau hauv cov khoom noj khoom haus, kom ntseeg tau tias qee cov pa pa tuaj yeem rov qab - nkag mus rau hauv cov txheej txheem combustion, yog li txo qis cov pa pa tawm mus rau hauv qhov chaw.
Lub EGR valve yog ib qho kev sib koom ua ke ntawm electromechanical, feem ntau ntsia rau ntawm cov roj av cav, tswj cov nqi ntawm cov pa roj recirculated. Nws yog feem ntau nyob rau sab ntawm cov khoom siv manifold, nyob ze ntawm lub throttle valve, thiab txuas nrog lub tso pa tawm ntawm cov yeeb nkab hlau luv kom ua tiav cov pa roj recirculation.
Lub luag haujlwm tseem ceeb ntawm EGR system yog txhawm rau txo qhov kub siab tshaj plaws hauv chav combustion los ntawm kev qhia txog qhov tsim nyog ntawm cov pa tso rau hauv lub tog raj kheej los koom rau hauv kev sib txuas, yog li txo qhov tsim ntawm nitrogen oxides (NOx). Thaum lub sij hawm tus txheej txheem no, EGR valve dynamically kho tus nqi ntawm cov pa pa recirculated raws li lub engine lub real-lub sij hawm ua hauj lwm tej yam kev mob kom sib npaug engine kev ua tau zoo thiab emission tswj yuav tsum tau.
Nitrogen thiab oxygen nkag tau tshuaj lom neeg nyob rau hauv qhov kub thiab txias los tsim nitrogen oxides. Lub cav combustion chamber yog precisely xws li ib puag ncig, tshwj xeeb tshaj yog pom thaum lub sij hawm acceleration. Yog li ntawd, kev tswj cov pa roj recirculation (EGR) hauv cov txheej txheem no yog qhov tseem ceeb.
Thaum lub cav nyob rau hauv load, EGR valve qhib, tso cai rau ib tug me me npaum li cas ntawm cov pa pa mus sib tov nrog cov cua tshiab nyob rau hauv lub intake manifold thiab nkag mus rau hauv lub combustion chamber. Thaum tsis ua haujlwm, EGR valve tseem raug kaw, thiab yuav luag tsis muaj cov pa hluav taws xob koom nrog kev rov ua dua tshiab. Cov pa roj carbon monoxide no lawv tus kheej tsis hlawv, tab sis lawv nqus qee qhov ntawm cov hluav taws kub combustion, yog li txo qhov kub thiab txias thiab siab, ntxiv inhibiting nitrogen oxide ntau lawm. Raws li lub cav ceev thiab thauj khoom nce, tus nqi ntawm cov pa pa nkag mus rau hauv lub combustion chamber kuj nce raws li.
