Based on a 1.5 L four-cylinder
gasoline engine, the cam profiles of the second and third cylinders on the
intake and exhaust camshafts were modified into base circles to achieve the
closure of intake and exhaust valves, and software control was used to cut fuel
injection in the second and third cylinders. The changes in fuel consumption
and vibration characteristics relative to the original four-cylinder gasoline engine were experimentally studied on the engine
bench after two cylinders were deactivated. The research results show that the
mechanical power loss of four-cylinder gasoline engine
with two deactivated cylinders reduces by 1.1%-10.4%
and the fuel consumption at the test condition points improves by 0.3%-6.4% at the speed of 1 000-4 000 r/min. However, the amplitude of crankshaft torsional vibration increases
by five times, and the linear vibrations in three directions of the engine＇s three mounting points significantly deteriorate.
