Relationship between throttle and exhaust temperature of diesel engine

I haven't studied this problem specifically, so I want to express my personal views.

There is a throttle in the intake system of gasoline engine, commonly known as throttle; The diesel engine relies on the oil pump pull rod (mechanical pump) to control the oil quantity, and the intake system does not have the throttle valve of the gasoline engine, so the intake resistance is small. I don't know if you mean engine exhaust by residual exhaust gas. If so, it is because the diesel engine has high efficiency, large excess air coefficient, full fuel combustion and full heat utilization, so the exhaust temperature is low.

Please correct me if there is anything wrong!