firikwensin crankshaft
Firikwensin matsayi na crankshaft yana ɗaya daga cikin firikwensin da suka fi muhimmanci a cikin tsarin sarrafa lantarki na injin. Yana ba da lokacin kunnawa (kusurwar gaba ta ƙonewa) da siginar don tabbatar da matsayin crankshaft, kuma ana amfani da shi don gano tsakiyar saman matacce na piston, kusurwar juyawar crankshaft da saurin injin. Tsarin da firikwensin matsayi na crankshaft ke amfani da shi ya bambanta da samfura daban-daban, kuma ana iya raba shi zuwa rukuni uku: nau'in bugun maganadisu, nau'in photoelectric da nau'in Hall. Yawanci ana sanya shi a ƙarshen gaba na crankshaft, ƙarshen gaba na camshaft, akan flywheel ko a cikin mai rarrabawa.