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Engine Manufacturer Association Workshop Presentation on Fuel Specifications and Design Variations

This presentation from the California Air Resources Board and California Energy Commission Workshop on August 3, 2005 in Sacramento focuses on the scope of the Engine Manufacturers Association, presenting specifications for Compressed Natural Gas (CNG). It discusses the challenges and concerns related to fuel specification changes, engine design variations, and the perspective of the EMA. The importance of stable fuel quality for engine reliability, knock resistance, energy content, and detailed certification fuel specifications is emphasized, especially in the context of upcoming emission standards for 2007 and 2010.

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Engine Manufacturer Association Workshop Presentation on Fuel Specifications and Design Variations

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  1. California Air Resources Board and California Energy Commission Workshop August 3, 2005 Sacramento, California PRESENTATION OF THE ENGINE MANUFACTURERS ASSOCIATION

  2. Scope of EMA Representation • Foreign and domestic manufacturers of diesel, gasoline and alternate-fueled internal combustion engines • Principally, non-integrated manufacturers of loose engines for on-highway and off-highway mobile applications, marine, locomotive and stationary applications • Wide range of engine sizes, from 1 hp to over 7000 hp

  3. Current Specifications for CNG* * Compressed Natural Gas, values expressed as mole percent ** U.S. EPA Certification Fuel specification

  4. ARB Draft Proposed Concept

  5. Engine Design and Fuel Specification • Engines are designed to operate on the fuel specified by the manufacturer • Emission compliance • Customer satisfaction • Adequate engine performance • Engine durability • Engine manufacturers cannot conduct performance/emission testing on multiple fuel formulations • For gaseous fuels engine manufacturers rely on knock sensitivity measured by octane, knock index or methane number

  6. Engine Design Variations • There are a wide variety of gaseous fueled engine designs in the market: • Lean burn engines • Stoichiometric/Rich burn engines • Engines with mechanical fuel control • Engines with electronic fuel control • Engines with or without knock sensing

  7. Fuel Specification Changes Raise Concerns • Negative impact on air quality • Increased HC and/or NOx emissions • Increased ozone potential • Customer dissatisfaction • Increased engine maintenance • Increasedrepair costs • Increasedoperating costs • Increased unscheduled downtime • Adverse effects on performance • Propensity for engine knock • Negative impact on long-term engine durability • Greater adverse impact on older engines

  8. CNG SPECIFICATION EMA Perspective • Engines require stable fuel quality for continuous reliability and customer acceptance • Knock resistance is critical • Energy content is important • A detailed certification fuel specification is required for mobile source engines • Variations in methane number will require multiple fuel availability andlabeling due to multiple engine configurations • Engine Development is in process for 2007 / 2010 emission standards based on current fuel

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