--- ngu-Aaron Turpen ngomhlaka-20-Mar-2015

Athini Amanye Amamaki?

Lawa amamaki e-TDC Ngezansi naPhezulu (aphinde abizwe ngokuthi Ngaphambi nangemuva). Siwakhomba njengokuthi “kwesokunxele” kanye “kwesokudla” kophawu olumaphakathi olubonakala lapho ubheke ngaphambili enjini (lapho ibhande likhona), hhayi ngendlela evamile yokuthi “kwesokunxele” kuba wuhlangothi lomshayeli ngoba lawa mamaki aqondiswe ngqo injini, hhayi imoto.
I-Below Top Dead Center (BTDC) imaki yilo elingakwesokunxele futhi imaki ye-ATDC yilo elingakwesokudla. Lezi yizilinganiso zedigri futhi zihluka kancane kuye ngenjini okukhulunywa ngayo.
Ku-four-cylinder evamile, isibonelo, uphawu lokuqala luyi-7.5-degrees ngaphambi kwesikhungo esiphezulu esifile, amamaki aphakathi yi-TDC, futhi umaki kwesokudla ama-degree angu-5 ngemva kwesikhungo esiphezulu esifile. Futhi, lezi zinombolo zamadigri zingashintsha ngokuya ngenjini okukhulunywa ngayo.
Uma uhambisa isikhathi sakho ukuze sihambisane nenye yamanye amamaki, ushintsha isikhathi se-valve yemoto. Uma kwenziwa ngekhonsathi nebhulokhi yenjini (ama-crankshaft marks), lokhu kungakhiqiza i-RPM ephansi noma ephakeme phezulu noma esiphethweni esiphansi ukuze kukhiqizwe amandla engeziwe ngesivinini esihlukile senjini. Ukuhambisa lezi zinguquko kushintsha ukuthi injini inamandla angakanani ekugcineni (isivinini esiphansi) noma ekugcineni (isivinini esiphezulu) omjaho noma ukusebenza kahle.




Kungani Ushintsha Ukuqondanisa Ku-ATDC noma I-BTDC?
Uma isikhathi sinyakaziswa ukuze sibe ngaphambi noma ngemva kwesikhungo esiphezulu esifile, sishintsha indlela isilinda “esivuleke” ngayo noma “esivaliwe” ngayo ngaphambi kokuba kujovwe izingxube zikaphethiloli nomoya bese inhlansi iyazithungela. Lokhu, futhi, kushintsha ukuthi ingakanani ikamelo elivuthayo elitholakalayo ekushiseni lapho libasiwe, okushintsha ukuthi kungakanani ukuhamba kwepiston okuphushwa ukusha kunomfutho wenjini. Lapho lolo hambo luqhutshwa ukusha, injini izosebenza kahle kakhulu, kodwa lokho kusha:isilinganiso sokuhamba siyashintsha kuma-RPM ahlukahlukene.
Ngokushunisela ekuthuthukisweni okuphansi noma okuphezulu, umakhenikha ukhetha ukudela ukusebenza kahle endaweni ethile ukuze avune enye. Ngokushuna ngqo ku-TDC esikhundleni salokho, umakhenikha ulungiselela ukusebenza kahle okumaphakathi kuwo wonke amazinga - yingakho izinjini ziphuma efekthri zine-TDC njengendawo yazo yesikhathi.

Ezinjinini ezindala, ukushintsha isikhathi sibe yi-BTDC noma i-ATDC kuzosho ukushintsha umsabalalisi ngeyakhe eyakhelwe leso sikhathi esisha. Amanye amakhithi e-adaptha ayatholakala kwezinye izinjini lapho lezi zinguquko zidumile, nokho, ezivumela izici zomsabalalisi ukuthi zishintshwe esikhundleni seyunithi yonke. Ezimotweni zesimanje ezengeziwe ezisebenzisa isikhathi se-elekthronikhi, ukushintshela ku-ATDC noma i-BTDC ngokuvamile kudinga kuphela “uhlelo olusha lwekhompyutha” ukuze kushintshwe isikhathi senhlansi/yokubasa.