Vehicle with engine having enhanced warm-up operation mode

摘要

An enhanced warm-up operation mode operates a first portion of engine cylinders (13a-f) in a power mode and a second portion of engine cylinders (13a-f) in a braking mode. More fuel is injected into the powered cylinders in order to maintain engine speed and overcome the retarding force of the engine compression release brakes (28a-f) on the braking cylinders. The engine (10) cycles through which cylinders (13a-f) are powered and which are braking during the warm-up procedure. The process reduces emissions, such as white smoke, that are common during cold start conditions.