Valve ya EGR (valavu yotulutsa mpweya wotulutsa mpweya) ndi makina opangira makina omwe amaikidwa pa injini ya dizilo kuti athe kuwongolera kuchuluka kwa mpweya wotulutsa mpweya womwe umabwezeretsedwanso ku dongosolo lolowera.
Valve ya EGR ndi chinthu chamagetsi chomwe chimayikidwa pa injini ya dizilo kuti chiwongolere kuchuluka kwa mpweya wotulutsa mpweya womwe umabwezeretsedwanso ku dongosolo lodya. Nthawi zambiri imakhala kumanja kwa njira yolowera, pafupi ndi thupi la throttle, ndipo imalumikizidwa nayo ndi chubu chachifupi chachitsulo chomwe chimatsogolera kuzinthu zambiri zotulutsa. Ntchito yake ndikuwongolera kuchuluka kwa mpweya wotulutsa mpweya womwe umalowa munjira zambiri, kotero kuti kuchuluka kwa mpweya wotulutsa mpweya kumadutsa munjira zambiri zomwe zimapangidwira kuti zibwezeretsedwe. Valve ya EGR ndi gawo lofunika kwambiri komanso lofunikira kwambiri pa chipangizo chothamangitsa mpweya wotulutsa mpweya.
Vavu ya EGR imagawidwa m'mitundu iwiri: mtundu wamakina ndi mtundu wowongolera zamagetsi.
The EGR valavu amachepetsa kutentha kwa chipinda kuyaka ndi kutsogolera utsi mpweya kutulutsidwa kuchokera kuyaka kwa injini kwa zobwezedwa ambiri kutenga nawo kuyaka, kuwongolera dzuwa ntchito ya injini, kuwongolera kuyaka chilengedwe, ndi kuchepetsa katundu pa injini, mogwira kuchepetsa umuna wa NO mankhwala, ndi kuchepetsa kugogoda nthawi zonse, kuchepetsa kugogoda nthawi. moyo wautumiki.
Dzina lonse ndi Exhaust Gas Recirculation, ndiko kuti, kutulutsa mpweya wotulutsa mpweya [1] Dongosololi limagwiritsidwa ntchito kuchepetsa kutulutsa kwa nitrogen oxides (NOX) mu mpweya wotulutsa mpweya. Nayitrojeni ndi okosijeni amachita mwamankhwala pokhapokha kutentha kwambiri komanso kupanikizika kwambiri, ndipo kutentha ndi kupanikizika m'chipinda choyaka cha injini zimakumana ndi izi, makamaka panthawi yokakamiza. Pamene injini ikuyenda pansi pa katundu, valavu ya EGR imatsegula, kulola mpweya wochepa wotulutsa mpweya kuti ulowe m'chipinda choyatsira moto pamodzi ndi kusakaniza koyaka. Valavu ya EGR imatsekedwa popanda ntchito, ndipo mpweya wotopa pang'ono umabwerezedwanso ku injini. Gasi wotulutsa magalimoto ndi gasi wosayaka (wopanda mafuta ndi okosijeni) yemwe satenga nawo gawo pakuyaka muchipinda choyaka. Amachepetsa kuyaka kutentha ndi kupsyinjika mwa kuyamwa mbali ya kutentha kopangidwa ndi kuyaka kuti kuchepetsa kupanga kwa nitrogen oxides. Kuchuluka kwa mpweya wotulutsa mpweya wolowa m'chipinda choyaka kumawonjezeka ndi liwiro la injini ndi katundu
Kutulutsa mpweya wotulutsa mpweya ndi njira yomwe gawo la mpweya wotulutsa mpweya umalowetsedwa mu mpweya wabwino (kapena kusakaniza) panthawi yogwira ntchito ya injini, ndikubwereranso ku silinda kuti ibwererenso kuti itenge nawo mbali pakuyaka. Ntchito yake ndikuchepetsa kutulutsa kwa NOx. NOx ndi mpweya woopsa kwambiri m'thupi la munthu, womwe umapangidwa makamaka ndi kutentha kwambiri komanso mpweya wabwino. Pa ntchito ya injini, ngati mbali ya mpweya utsi ndi reintroduced mu yamphamvu mu nthawi yake ndi koyenera, chifukwa chigawo chachikulu cha mpweya utsi ali ndi lalikulu ndithu kutentha mphamvu, CO2, utsi mpweya akhoza kuyamwa mbali ya kutentha kwaiye ndi kuyaka ndi kuchotsa izo mu yamphamvu kusakaniza ndi zotsatira zabwino pa osakaniza. Kuthira kwina kwina, motero kuchepetsa kutentha kwakukulu ndi mpweya wa mpweya wa injini, motero kuchepetsa mapangidwe a NOx.
Komabe, mopitirira muyeso utsi mpweya recirculation zingakhudze ntchito yachibadwa injini, makamaka pamene injini ikugwira ntchito pa liwiro lopanda ntchito, liwiro otsika ndi katundu otsika ndi injini akuthamanga mu mkhalidwe ozizira, ndi pamene mphamvu ya injini chofunika pa katundu (full throttle), recirculation Utsi gasi adzakhala ndi vuto lalikulu pa ntchito ya injini. Choncho, kuchuluka kwa mpweya wotulutsa mpweya womwe umalowa mu recirculation uyenera kusinthidwa molingana ndi momwe injini ikugwirira ntchito komanso kusintha kwa ntchito. Zochita zatsimikizira kuti, malinga ndi makina osiyanasiyana a injini, kuchuluka kwa mpweya wotulutsa mpweya womwe umakhudzidwa ndi kubwereza nthawi zambiri kumasiyana pakati pa 6% ndi 13%.
Pofuna kuti kuchuluka kwa mpweya wotulutsa mpweya kusakhale ndi mphamvu yochuluka pa injini, injini zamakono zoyendetsedwa ndi magetsi zimagwiritsanso ntchito njira yotseka yotseketsa mpweya wotulutsa mpweya, ndipo sensa ya EGR valve imayikidwa pa valve yotulutsa mpweya wotulutsa mpweya (zitsanzo zina zimagwiritsanso ntchito zowunikira kutentha kwa gasi). kapena kupanikizika sensa), kutsekedwa-kuwongolera kuwongolera ndemanga kuwongolera kwenikweni kutulutsa mpweya wotulutsa mpweya kumachitidwa. Malo oyenda bizinesi. Kutalika kwa pansi kuchokera pansi kumakhala kochepa, ndipo kuchuluka kwa malo ogwiritsira ntchito malo amkati ndipamwamba kwambiri pakati pa zinthu zofanana, zomwe ndi 19% kuposa zomwezo; malo aakulu.
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Kuwongolera kolimba, kokhazikika kwaukadaulo wa MIRA kumapereka kumverera koyendetsa kofanana ndi kwagalimoto yonyamula anthu. Ukadaulo wa kuyimitsidwa kwa mpweya ukhoza kupititsa patsogolo luso la kudzipatula kwa msewu, ndikuwongolera malire ndi chitonthozo [19]
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