Experimental Investigation of Close-Loop Control of HCCI Engine Using Dual Fuel Approach I I T Kanpur

Format:

Conference/Event

Author/Creator:

Maurya, Maurya, author.

Contributor:

Agarwal, Avinash Kumar

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

Homogeneous Charge Compression Ignition (HCCI) offers greatpromise for excellent fuel economy and extremely low emissions ofNOx and PM. HCCI combustion lacks direct control on the"start of combustion" such as spark timing in SI enginesand fuel injection timing in CI engines. Auto ignition of ahomogeneous mixture is very sensitive to operating conditions ofthe engine. Even small variations of the load can change the timingfrom "too early" to "too late" combustion. Thusa fast combustion phasing control is required since it sets theperformance limitation of the load control. Crank angle positionfor 50% heat release is used as combustion phasing feedbackparameter.In this study, a dual-fuel approach is used to controlcombustion in a HCCI engine. This approach involves controlling thecombustion heat release rate by adjusting fuel reactivity accordingto the conditions inside the cylinder. Two different octane fuels(methanol and n-heptane) are used for the study. Port fuelinjection technique is used for preparing homogeneous mixture ofmethanol, heptane and air using two separate injectors for methanoland heptane. Close loop control of combustion phasing is attainedby instantaneous variation of fuel ratio of methanol and n-heptanewhile maintaining the injected fuel energy constant. Total fuelenergy injected is used to control the IMEP of the engine. It isfound that controller is able to keep close track of the referencecombustion phasing using PID control by changing the fuel ratio.PID control of combustion phasing and IMEP using dual fuel isachieved and is successfully demonstrated in the HCCI engine in thestudy

Notes:

Vendor supplied data

Publisher Number:

2013-01-1675

Access Restriction:

Restricted for use by site license