Multi-Cylinder Opposed Piston Transient and Exhaust Temperature Management Test Results

Redon, Fabien; Sharma, Arunandan; Headley, John V.

doi:10.4271/2015-01-1251

Cited by 12 publications

(9 citation statements)

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“…With smoke limiter implemented and higher supercharger drive ratio, the engine was able to achieve the full load torque from 25% load at constant speed within 1.5 seconds with minimal NOx and soot spikes. The torque response time and emissions results for different supercharger drive ratios for OP engine have been discussed in detailed earlier [13].…”

Section: Transient Controls and Test Resultsmentioning

confidence: 99%

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Achieving Bharat Stage VI Emissions Regulations While Improving Fuel Economy with the Opposed-Piston Engine

Naik¹,

Johnson²,

Fromm³

et al. 2017

SAE Int. J. Engines

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The Indian government is introducing Bharat Stage VI (BS-VI) emissions standards (equivalent to Euro VI standards) from 2020, completely bypassing Stage V standards. For commercial vehicles with diesel engines, these standards will reduce the NOx emissions by 88% and Particulate Matter (PM) emissions by 66% from current BS IV standards. Table 1 shows tailpipe emissions and test cycles for BS IV and BS VI emissions standards [1]. Table 1. Tailpipe emissions standards for India.

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Section: Transient Controls and Test Resultsmentioning

confidence: 99%

“…Additional to transient controls, API has also developed warm-up strategies for catalyst light off, details of which have been published in other papers [10] [13].…”

Section: Transient Controls and Test Resultsmentioning

confidence: 99%

Achieving Bharat Stage VI Emissions Regulations While Improving Fuel Economy with the Opposed-Piston Engine

Naik¹,

Johnson²,

Fromm³

et al. 2017

SAE Int. J. Engines

Self Cite

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“…The catalyst light-off mode (CLO) offers significant advantages that can be activated almost immediately after startup or during any extended idle where it is necessary to maintain the optimum temperatures in the aftertreatment system. In previous publications [9], it was demonstrated that turbo-out temperatures reaching 400°C were achieved during the elevated idle implemented in Catalyst light off operating mode.…”

Section: Engine Controls and Operating Modementioning

confidence: 94%

“…Figure 3 provides the overview of the air handling system implemented on the 4.9L Achates Power research engine. Achates Power has developed and implemented controls strategies for controlling rail-pressure Fast Catalyst Light-off Mode (CLO) [9] With conventional diesel engines, the limited ability to modify trapped conditions, along with the need for stable combustion limit the potential for achieving high exhaust temperatures. This is evidenced by strategies in use for the latest heavy-duty emissions certifications, where manufacturers have implemented fuel injection directly into the exhaust stream to warm diesel oxidation catalysts or used electrical heating elements upstream of the catalysts.…”

Section: Engine Controls and Operating Modementioning

confidence: 99%

“…In second paper [9], published at SAE World Congress 2015, the Opposed-Piston Engine transient capabilities were assessed by testing the engine performance and emissions response under a typical transient maneuver controlling both NOx and Soot with a minimal torque lag. Additionally, the ability of the Opposed-Piston Engine to manage exhausts temperatures was also demonstrated.…”

Section: Cold-start Heavy-duty Ftp Testing On Opposed-piston Enginementioning

confidence: 99%

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Cold Start HD FTP Test Results on Multi-Cylinder Opposed-Piston Engine Demonstrating Rapid Exhaust Enthalpy Rise to Achieve Ultra Low NOx

Patil¹,

Ghazi²,

Redon³

et al. 2018

SAE Technical Paper Series

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T he 2010 emission standards for heavy-duty diesel engines in the U.S. have established a limit for oxides of nitrogen (NOx) emissions of 0.20 g/bhp-hr., a 90% reduction from the previous emission standards. However, it has been projected that even when the entire on-road fleet of heavy-duty vehicles operating in California is compliant with the 2010 emission standards, the upcoming National Ambient Air Quality Standards (NAAQS) requirement for ambient particulate matter and ozone will not be achieved in California without further significant reductions in NOx emissions from the heavy-duty vehicle fleet. Given this, there is potential of further reduction in NOx emissions limit standards for heavy duty engines in the US. Recently there have been extensive studies and publications focusing on ultra-low NOx after treatment technologies that help achieve up to 0.02g/bhp-hr. at tailpipe [1].To achieve ultra-low NOx emission levels over the composite HD FTP cycle, rapid heat energy must be provided to the diesel exhaust after-treatment system during cold start portion of the cycle, and peak NOx reduction efficiency must be maintained during the hot-start portion of cycle. Delivering this has been the challenge for conventional four-stroke heavy duty diesel engines as these are competing demands. Ultra-low NOx system solutions involving the implementation of supplemental heat sources downstream in the exhaust system comes at CO 2 penalty and adds significant cost and complexity.The Achates Power Opposed-Piston Engine design provides an ideal solution to this challenge. The opposedpiston engine has several inherent advantages over conventional four-stroke engines, like higher BTE [2], low BMEP and internal EGR facilitating low engine out NOx and ability to provide rapid engine out temperature rise [3] for emission system while maintaining low engine out NOx. This paper highlights the results from cold-start HD FTP testing with the 4.9L Opposed-Piston Engine. The target of this testing was to evaluate the ability of the Achates Power Opposed-Piston Engine to provide rapid engine out temperature rise by operating the engine in the mode designed to deliver exhaust enthalpy, aiding fast catalyst light-off which enables early and peak NOx conversion in the exhaust after treatment system. Rapid exhaust heat and temperature rise that was delivered exceeded SCR catalyst light-off temperature thresholds (200°C) within the first 40 seconds in the cycle while controlling the engine out NOx levels.

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Opposed-Piston Gasoline Compression Ignition Engine

Redon¹,

Fromm²,

Salvi³

2022

Gasoline Compression Ignition Technology

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Multi-Cylinder Opposed Piston Transient and Exhaust Temperature Management Test Results

Cited by 12 publications

References 1 publication

Achieving Bharat Stage VI Emissions Regulations While Improving Fuel Economy with the Opposed-Piston Engine

Achieving Bharat Stage VI Emissions Regulations While Improving Fuel Economy with the Opposed-Piston Engine

Cold Start HD FTP Test Results on Multi-Cylinder Opposed-Piston Engine Demonstrating Rapid Exhaust Enthalpy Rise to Achieve Ultra Low NOx

Opposed-Piston Gasoline Compression Ignition Engine

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