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Nagar, Nishit
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Developing a 55% BTE Commercial Heavy-Duty Opposed-Piston Engine without a Waste Heat Recovery System

Achates Power Inc-Nishit Nagar, Rodrigo Zermeno, Michael chiang, Isaac Thomas
Achates Power Inc.-Neerav Abani
Published 2017-03-28 by SAE International in United States
Heavy-duty vehicles, currently the second largest source of fuel consumption and carbon emissions are projected to be fastest growing mode in transportation sector in future. There is a clear need to increase fuel efficiency and lower emissions for these engines. The Opposed-Piston Engine (OP Engine) has the potential to address this growing need. In this paper, results are presented for a 9.8L three-cylinder two-stroke OP Engine that shows the potential of achieving 55% brake thermal efficiency (BTE), while simultaneously satisfying emission targets for tail pipe emissions. The two-stroke OP Engines are inherently more cost effective due to less engine parts. The OP Engine architecture presented in this paper can meet this performance without the use of waste heat recovery systems or turbo-compounding and hence is the most cost effective technology to deliver this level of fuel efficiency.In this paper, engine performance results are presented for the 9.8L two-stroke OP Engine that employs currently available engine components, such as supercharger, turbocharger and after-treatment and features a uniquely designed piston bowl shape to enhance mixing with a…
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Real Time Implementation of DOC-DPF Models on a Production-Intent ECU for Controls and Diagnostics of a PM Emission Control System

SAE International Journal of Commercial Vehicles

Pi Shurlok, LLC-Nishit Nagar, Xiaolai He, Vikram Iyengar, Nirav Acharya, Arkadiusz Kalinowski
Tenneco Inc.-Adam Kotrba, Timothy Gardner, Argun Yetkin
  • Journal Article
  • 2009-01-2904
Published 2009-10-06 by SAE International in United States
This paper describes the joint development by Tenneco and Pi Shurlok of a complete diesel engine aftertreatment system for controlling particulate matter emissions. The system consists of a DOC, DPF, sensors, controller and an exhaust fuel injection system to allow active DPF regeneration.The mechanical components were designed for flow uniformity, low backpressure and component durability. The overall package is intended as a complete PM control system solution for OEMs, which does not require any significant additions to the OEM's engine control strategies and minimizes integration complexity. Thus, to make it easier to adapt to different engine platforms, ranging from small off-road vehicle engines to large locomotive engines, model-based control algorithms were developed in preference to map-based controls.Pi's recently-developed general-purpose OpenECU electronic controller, based on the MPC-5534 processor core, was applied to run the advanced 1-D DOC and 0-D lumped DPF thermo-chemical models in real time to control the fuel injection system. The system was integrated with a Cummins 5.9 L engine in the engine dynamometer laboratory at Tenneco. The control algorithm and models were first…
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