MILLER CYCLE ENGINE OUTLINE [ZJ (Miller Cycle Engine)]

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•  The miller cycle engine is a high-efficiency engine which realizes high fuel economy performance by obtaining a high-expansion ratio.
•  The miller cycle engine realizes a high-expansion ratio without increasing its effective compression ratio by decreasing the speed of the intake air valve close timing. If a past engine (Otto cycle engine) were to obtain a high-expansion ratio, the effective compression ratio would increase and cause abnormal combustion.
•  Combined with the CVT, both high fuel economy and acceleration performance are obtained.

Miller cycle engine operation

1.  Intake air is introduced into the cylinder.

2.  After completing the intake air operation, the intake air valve is left open momentarily even if the piston passes the BDC, and a part of the intake air in the cylinder reverses back to the intake pipe.

(The reversed intake air is inducted into other cylinders and the same cylinders of the next cycle.)

3.  The compression stroke starts from the position in which intake valve is closed (smaller compression).

4.  Combustion→larger expansion→sufficient energy absorption→high fuel economy performance is realized.

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