Preliminary investigation of dilution strategies to control engine torque during transient events

R D Maugham, C J Brace, N D Vaughan, S W Murray

Research output: Contribution to conferencePaper

2 Citations (SciVal)


A continuously variable transmission (CVT) allows a powertrain controller the freedom to develop a required output power at a range of engine torque and speed conditions. This flexibility can be used to maximise fuel efficiency. Due to low frictional and pumping losses a gasoline engine's fuel efficiency is maximised at low speed, high torque conditions. However due to the reduced torque margin available, controlling a gasoline engine in this region compromises transient vehicle response. Dilution torque control, using EGR or lean burn, has the potential to maintain the economy gains available using a CVT powertrain whilst improving a vehicle's driveability. This paper introduces preliminary work that has been undertaken to investigate the potential of charge dilution to control steady state engine torque. A test rig has been developed based around an engine fitted with variable cam phasing and an external EGR system. The paper contains a discussion of initial results of a lean dilution test program used to demonstrate the principle
Original languageEnglish
Publication statusPublished - 2001
EventAmerican Society of Mechanical Engineers - Argonne, IL, USA United States
Duration: 1 Jan 2001 → …


ConferenceAmerican Society of Mechanical Engineers
Country/TerritoryUSA United States
CityArgonne, IL
Period1/01/01 → …


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