Njikwa ihe na-akpata
Nyocha nke ogo iyi nke ihe na-eme ka ọ bụrụ ọkachamara a maara dị ka onye ntụgharị catalytic, bụ nke a na-eme mgbe niile site na usoro nyocha nke on-board, na-agụnye ịlele mgbanwe nke ikuku oxygen na gas na-ekpocha ọkụ tupu na mgbe ihe na-akpata.
Maka ebumnuche a, a na-eji akara ngosi nke ihe mmetụta oxygen (nke a makwaara dị ka sensọ lambda) zitere. A na-etinye otu n'ime sensọ n'ihu ya 
catalyst na azụ nke abụọ. Ihe dị iche na mgbaàmà bụ n'ihi na ụfọdụ n'ime ikuku oxygen dị na gas na-ekpochapụ na-ejide ihe na-eme ka ọ bụrụ ihe na-emepụta ihe na ya mere ikuku oxygen dị na gas na-ekpochapụ na-agbadata. A na-akpọ ike ikuku oxygen nke ihe na-eme ka ọ bụrụ ikike oxygen. Ọ na-ebelata ka ihe na-eme ka ọ na-eyi, nke na-eduga n'ịba ụba nke oxygen na ikuku ikuku na-ahapụ ya. Usoro nyocha nke on-board na-enyocha ike ikuku oxygen nke ihe na-eme ka ọ dị mma ma jiri ya chọpụta irè ya.
A na-ejikarị ihe mmetụta ikuku oxygen arụnyere n'elu nke ihe na-emepụta ihe iji chịkwaa ngwakọta nke ngwakọta. Ọ bụrụ na nke a bụ ihe a na-akpọ ngwakọta stoichiometric, nke ọnụ ọgụgụ nke ikuku a chọrọ iji kpoo dose nke mmanụ ọkụ n'otu oge hà nhata nke usoro ihe omume gbakọọ, nke a na-akpọ ọnụọgụ ọnụọgụ abụọ. Ọ na-agwa usoro nchịkwa na ngwakọta bara ọgaranya ma ọ bụ dabere (maka mmanụ ụgbọala), ma ọ bụghị site na ole. Enwere ike ịrụ ọrụ ikpeazụ a site na ihe a na-akpọ brọdband lambda probe. Ya mmepụta oke, nke e ji mara oxygen ọdịnaya na iyuzucha gas, abụghịzi voltaji na-agbanwe stepwise (dị ka a abụọ ọnọdụ nyocha), ma ihe fọrọ nke nta linearly na-amụba ike ugbu a. Nke a na-enye ohere ka a tụle ihe mejupụtara gas na-ekpochapụ n'elu oke ikuku ikuku, nke a makwaara dị ka lambda ratio, ya mere okwu brọdband nyocha.
Nyocha lambda, arụnyere n'azụ ihe ntụgharị catalytic, na-arụ ọrụ ọzọ. N'ihi ịka nká nke ihe mmetụta oxygen dị n'ihu onye na-emepụta ihe, ngwakọta nke a na-achịkwa na-adabere na mgbaàmà ya (nke ziri ezi) na-aghọwanye ihe. Nke a bụ nsonaazụ nke ịgbanwe njirimara nke nyocha. Ọrụ nke ihe mmetụta oxygen nke abụọ bụ ịchịkwa nkezi mejupụtara nke ngwakọta ọkụ. Ọ bụrụ na, dabere na akara ya, onye na-ahụ maka injin na-achọpụta na ngwakọta ahụ dị oke nro, ọ ga-abawanye oge ịgbanye ya ka o wee nweta ihe mejupụtara ya dị ka ihe achọrọ nke mmemme njikwa.
