1985-09-01

A New Type of Miller Supercharging System for High-Speed Engines - Part 1 Fundamental Considerations and Application to Gasoline Engines 851522

This paper deals with a new type of Miller cycle engine which is installed with an intake control rotary valve, and presents the experimental investigation on the test engine which was undertaken to examine the capacity of supercharging as well as fuel economy in the application of the new system to small-sized gasoline engines.
An experimental investigation on the test engine with some simple modification to a conventional engine revealed that the intake control rotary valve installation is quite effective to control the virtual compression ratio.
It was ascertained by an external supercharging test that reduced compression ratio with constant expansion ratio allowed the test engine to obtain a considerably higher level of torque in the low engine speed range than had been attained in conventional supercharged engines without any increase in fuel consumption.
In the turbocharging test, the new system also proved increased maximum torque and better fuel economy as well, accompanied with remarkable decrease in the exhaust gas temperature.

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