What does intelligent cylinder changing technology mean? Advantages and disadvantages of variable cylinder technology

The so-called intelligent cylinder changing technology refers to a series of "methods" to make some cylinders stop (sleep) while the rest cylinders work normally when the engine is working at medium and low load, thus reducing fuel consumption and exhaust emissions; When heavy load work is needed, let all cylinders work so as not to feel lack of power. This technology is usually used in multi-cylinder large displacement engines, such as V8, V 10 and V 12. The advantage of variable cylinder technology is that when the load is running or slowing down, the system will close some cylinders and only use the remaining cylinders to reduce fuel consumption. When the vehicle needs high power output, such as sudden acceleration or climbing, the system will automatically use all cylinders to provide enough power, so as to give consideration to economy and power and realize intelligent management of power; In addition, when some cylinders stop working, the system will increase the workload of the remaining cylinders, thus indirectly improving the fuel efficiency of cylinders and reducing fuel consumption, which can generally save about 8% of fuel consumption. However, the disadvantage of cylinder-changing technology is that only some cylinders work when running at a small load or at a reduced speed, and after closing some cylinders, it is easy to cause the overall imbalance of the engine, resulting in certain jitter and abnormal noise. Variable cylinder technology belongs to the new technical field of engines. At present, the representative variable cylinder technologies are VCM (Variable Cylinder Management Technology), MDS (Multistage Variable Displacement Control System), DOD (Variable Displacement Control Technology) and ACT (Active Variable Cylinder Management Technology).