Automotive engine with controlled exhaust temperature and oxygen concentration

A diesel engine arrangement comprising:

• a plurality of variable volume working and combustion chambers;
• a first passage for delivering air to said combustion chambers;
• a second passage for delivering exhaust from said combustion chambers;
• a turbocharger having a compressor with an outlet fluidly connected with said first passage, said turbocharger having a turbine with an inlet fluidly connected with said second passage and an outlet fluidly connected with a third passage;
• an EGR bypass passage connecting said second passage with said first passage;
• an EGR valve within said EGR passage controlling flow of exhaust from said second passage to said first passage;
• a first bypass passage between said first passage and said third passage, said first bypass passage fluidly connecting with said first passage upstream of said EGR bypass passage in connection with said first passage;
• and
• a first valve controlling flow of air from said first passage to said third passage through said first bypass passage responsive to a condition of said third passage to provide a desired condition in said third passage.

A method of operating an internal combustion engine with at least one variable volume working and combustion chamber, said method comprising:

• fluidly connecting a first passage with said combustion chamber to deliver air to said combustion chamber;
• fluidly connecting said combustion chamber with a second passage for delivering exhaust from said combustion chamber;
• delivering compressed air to said first passage utilizing a compressor of a turbocharger;
• delivering said exhaust of said combustion chamber through said second passage to an inlet of a turbine of said turbocharger;
• connecting an exhaust of said turbocharger turbine with a third passage;
• treating for emissions said combustion chamber exhaust delivered from said third passage;
• bypassing some of said air from said first passage to said third passage;
• and
• valving said air delivered from said first passage to said third passage in a response to a condition of said exhaust in said third passage.