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A NEW TYPE OF MILLER CYCLE GASOLINE ENGINE

Makoto Kamata, Y Komani, Takao Nakayama, Hiroshi Sakai, Hiroshi Kanesaka

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Abstract

A new type of Miller cycle gasoline engine was demonstrated to examine its capability of high level of supercharging as well as fuel economy in automotive applications. An experimental investigation on the test engine with some simple modifications to a conventional engine revealed that the intake control rotary valve installation is quite effective to control the virtual compression ratio. 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 has been attained in conventional supercharged engines without any increase in fuel consumption. A further high level of supercharging is likely to be achieved with the new Miller system if the deterioration of combustion observed in the test engine can be overcome. (Author/TRRL)

About this research paper

What this paper is about

A new type of Miller cycle gasoline engine was demonstrated to examine its capability of high level of supercharging as well as fuel economy in automotive applications. An experimental investigation on the test engine with some simple modifications to a conventional engine revealed that the intake control rotary valve installation is quite effective to control the virtual compression ratio. 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 has been attained in conventional supercharged engines without any increase in fuel consumption. A further high level of supercharging is likely to be achieved with the new Miller system if the deterioration of combustion observed in the test engine can be overcome. (Author/TRRL)

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OpenAlex reports 2 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

A new type of Miller cycle gasoline engine was demonstrated to examine its capability of high level of supercharging as well as fuel economy in automotive applications. An experimental investigation on the test engine with some simple modifications to a conventional engine revealed that the intake control rotary valve installation is quite effective to control the virtual compression ratio. 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 has been attained in conventional supercharged engines without any increase in fuel consumption. A further high level of supercharging is likely to be achieved with the new Miller system if the deterioration of combustion observed in the test engine can be overcome. (Author/TRRL)

Key concepts: Automotive engineering, Petrol engine, Compression ratio, Fuel efficiency, Gasoline, Torque, Internal combustion engine, Engineering

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