A Common Problem in Direct Spark Ignition Systems Is… Misfires!
Ever felt that frustrating stutter in your engine, that hesitant acceleration, or even a check engine light illuminating your dashboard? If you're dealing with an internal combustion engine (ICE) vehicle equipped with a Direct Spark Ignition (DSI) system, the culprit might be more common than you think. This post dives deep into a prevalent issue plaguing DSI systems: misfires. We'll explore the causes, symptoms, diagnostic techniques, and solutions to get your engine running smoothly again. We’ll cover everything from simple fixes you can potentially tackle yourself to more complex repairs best left to professionals. Let's get started!
Understanding Direct Spark Ignition Systems
Before we delve into the problems, a quick recap on DSI systems is helpful. Unlike older distributor-based ignition systems, DSI employs individual ignition coils for each cylinder. This allows for precise spark timing and energy delivery, leading to improved fuel efficiency and reduced emissions. However, this precision also means that even small issues can significantly impact performance.
The Most Common Problem in Direct Spark Ignition Systems Is: Misfires
A misfire occurs when the air-fuel mixture in a cylinder fails to ignite properly. This can result from a variety of factors, all ultimately leading to incomplete combustion and a loss of power. The severity can range from a barely noticeable stumble to a complete engine stall.
Causes of Misfires in DSI Systems
Several issues can contribute to misfires in DSI systems. Let’s examine some of the most frequent culprits:
- Faulty Spark Plugs: This is arguably the most common cause. Over time, spark plugs degrade, experiencing wear and tear on the electrodes. This can lead to weak or inconsistent sparks, resulting in misfires. The gap between the electrodes can also become too wide or narrow, impeding proper spark delivery.
- Damaged Ignition Coils: As mentioned, DSI systems utilize individual coils for each cylinder. These coils can fail due to overheating, electrical shorts, or general wear and tear. A faulty coil will fail to deliver the necessary high voltage to the spark plug, resulting in a misfire.
- Problems with the Ignition Control Module (ICM): The ICM is the brain of the ignition system, controlling the timing and delivery of the spark. A malfunctioning ICM can lead to incorrect spark timing or even a complete failure to deliver a spark to one or more cylinders.
- Low Fuel Pressure: Insufficient fuel pressure can prevent the formation of a proper air-fuel mixture, leading to incomplete combustion and misfires. A faulty fuel pump or clogged fuel filter are common causes of low fuel pressure.
- Air Intake Leaks: Leaks in the intake system can introduce unmetered air into the engine, upsetting the air-fuel ratio and causing misfires. These leaks can be difficult to locate, often requiring a thorough inspection of all intake components.
- Clogged Fuel Injectors: Dirty or clogged fuel injectors can restrict the flow of fuel, preventing the proper delivery of fuel to the cylinders, again leading to incomplete combustion and misfires.
- Damaged Crankshaft Position Sensor (CKP): The CKP sensor is crucial for accurate ignition timing. A faulty CKP sensor can provide inaccurate signals to the engine control unit (ECU), leading to incorrect spark timing and misfires.
Diagnosing Misfires in DSI Systems
Diagnosing misfires involves a systematic approach:
Check Engine Light: The most obvious sign is a check engine light accompanied by diagnostic trouble codes (DTCs). A scan tool can retrieve these codes, providing valuable clues about the potential cause.
Visual Inspection: Inspect spark plugs for wear, damage, or fouling. Check ignition coils for any visible damage, such as cracks or burns.
Compression Test: A compression test measures the pressure within each cylinder. Low compression in one or more cylinders can indicate a problem with valves, piston rings, or head gasket.
Fuel Pressure Test: A fuel pressure test ensures the fuel system is delivering the correct fuel pressure.
Air Intake System Inspection: Carefully inspect the air intake system for any leaks or cracks.
Professional Diagnostics: If you're not comfortable performing these tests yourself, take your vehicle to a qualified mechanic for professional diagnosis and repair.
Solutions to Misfires in DSI Systems
The solution depends entirely on the root cause of the misfire. Simple issues like worn spark plugs or faulty ignition coils can be relatively easy to fix with replacement parts. More complex issues, such as a faulty ICM or problems with the fuel system, may require more extensive repairs. Always consult your vehicle's repair manual or seek professional help for more involved repairs.
Conclusion
Misfires in direct spark ignition systems are a common problem that can manifest in various ways, ranging from minor performance issues to major engine problems. Identifying the underlying cause requires a methodical approach involving visual inspection, diagnostic testing, and possibly professional intervention. By understanding the common causes and troubleshooting steps outlined above, you can get your vehicle back on the road and running smoothly. Remember, addressing misfires promptly is crucial to prevent further engine damage.
FAQs
- Can I drive with a misfire? While you might be able to drive with a minor misfire, it's generally not recommended. Continued driving with a misfire can lead to more significant engine damage, potentially resulting in costly repairs.
- How much does it cost to fix a misfire? The cost varies widely depending on the cause. Replacing spark plugs is relatively inexpensive, while repairing a faulty ICM or fuel system could be significantly more costly.
- How often should I replace my spark plugs? Spark plug replacement intervals vary depending on the vehicle and driving conditions. Consult your owner's manual for recommended replacement intervals.
- Can I replace spark plugs and ignition coils myself? While some DIY enthusiasts might be comfortable performing these repairs, it's essential to have the necessary tools, knowledge, and experience. Improper repair can lead to further damage.
- My check engine light is on, but there are no noticeable symptoms. Should I be concerned? Yes, even without noticeable symptoms, a check engine light indicates a problem. Have your vehicle diagnosed by a professional to identify and address the issue before it escalates.
| a common problem in direct spark ignition systems is: Heating & Cooling Systems Testbook , 2003 |
| a common problem in direct spark ignition systems is: Common Rail System for GDI Engines Giovanni Fiengo, Alessandro di Gaeta, Angelo Palladino, Veniero Giglio, 2012-11-02 Progressive reductions in vehicle emission requirements have forced the automotive industry to invest in research and development of alternative control strategies. Continual control action exerted by a dedicated electronic control unit ensures that best performance in terms of pollutant emissions and power density is married with driveability and diagnostics. Gasoline direct injection (GDI) engine technology is a way to attain these goals. This brief describes the functioning of a GDI engine equipped with a common rail (CR) system, and the devices necessary to run test-bench experiments in detail. The text should prove instructive to researchers in engine control and students are recommended to this brief as their first approach to this technology. Later chapters of the brief relate an innovative strategy designed to assist with the engine management system; injection pressure regulation for fuel pressure stabilization in the CR fuel line is proposed and validated by experiment. The resulting control scheme is composed of a feedback integral action and a static model-based feed-forward action, the gains of which are scheduled as a function of fundamental plant parameters. The tuning of closed-loop performance is supported by an analysis of the phase-margin and the sensitivity function. Experimental results confirm the effectiveness of the control algorithm in regulating the mean-value rail pressure independently from engine working conditions (engine speed and time of injection) with limited design effort. |
| a common problem in direct spark ignition systems is: Automotive Fuel and Emissions Control Ekaling Jain, 2025-01-03 Automotive Fuel and Emissions Control emphasizes the troubleshooting and diagnostic aspects of emissions control systems and automotive fuel. We cover all factors related to this field, aligning with the latest NATEF tasks. This book caters to the educational needs of students worldwide, especially those studying automotive fuels and emissions control systems. We also focus on meeting the requirements of professional technicians, addressing the need for improved training standards. Our book aims to equip budding technicians with the necessary skills for effective diagnostics and procedures, fulfilling both basic and advanced needs. |
| a common problem in direct spark ignition systems is: Automotive Spark-Ignited Direct-Injection Gasoline Engines F. Zhao, M.-C. Lai, D.L. Harrington, 2000-02-08 The process of fuel injection, spray atomization and vaporization, charge cooling, mixture preparation and the control of in-cylinder air motion are all being actively researched and this work is reviewed in detail and analyzed. The new technologies such as high-pressure, common-rail, gasoline injection systems and swirl-atomizing gasoline fuel injections are discussed in detail, as these technologies, along with computer control capabilities, have enabled the current new examination of an old objective; the direct-injection, stratified-charge (DISC), gasoline engine. The prior work on DISC engines that is relevant to current GDI engine development is also reviewed and discussed. The fuel economy and emission data for actual engine configurations have been obtained and assembled for all of the available GDI literature, and are reviewed and discussed in detail. The types of GDI engines are arranged in four classifications of decreasing complexity, and the advantages and disadvantages of each class are noted and explained. Emphasis is placed upon consensus trends and conclusions that are evident when taken as a whole; thus the GDI researcher is informed regarding the degree to which engine volumetric efficiency and compression ratio can be increased under optimized conditions, and as to the extent to which unburned hydrocarbon (UBHC), NOx and particulate emissions can be minimized for specific combustion strategies. The critical area of GDI fuel injector deposits and the associated effect on spray geometry and engine performance degradation are reviewed, and important system guidelines for minimizing deposition rates and deposit effects are presented. The capabilities and limitations of emission control techniques and after treatment hardware are reviewed in depth, and a compilation and discussion of areas of consensus on attaining European, Japanese and North American emission standards presented. All known research, prototype and production GDI engines worldwide are reviewed as to performance, emissions and fuel economy advantages, and for areas requiring further development. The engine schematics, control diagrams and specifications are compiled, and the emission control strategies are illustrated and discussed. The influence of lean-NOx catalysts on the development of late-injection, stratified-charge GDI engines is reviewed, and the relative merits of lean-burn, homogeneous, direct-injection engines as an option requiring less control complexity are analyzed. |
| a common problem in direct spark ignition systems is: Advances in Combustion Technology Debi Prasad Mishra, 2022-10-24 This edited volume on combustion technology covers recent developments and provides a broad perspective of the key challenges in this emerging field. Divided into two sections, the first one covers micro-combustion systems, hydrogen combustors, combustion systems for gas turbines and IC engines, coal combustors for power plants and gasifier systems. The second section focusses on combustion systems pertaining to aerospace including supersonic combustors, rocket engines and gel propellant combustion. Issues related to energy producing devices in power generation, process industries and aerospace vehicles and efficient and eco-friendly combustion technologies are also explained. Features: Provides comprehensive coverage of recent advances in combustion technology Explains definite concepts about the design and development in combustion systems Captures developments relevant for the aerospace area including gel propellant, aluminium-based propellants, gasification and gas turbines Aims to introduce the combustion system in different industries Expounds novel combustion systems with reference to pertinent renewable technologies This book is aimed at researchers and graduate students in chemical, mechanical and aerospace engineering, energy and environmental engineering, and thermal engineering. This book is also aimed at practicing engineers and decision makers in industry and research labs, and petroleum utilization. |
| a common problem in direct spark ignition systems is: Gas Heating Jason Obrzut, CMHE, 2019-01-01 Depending on what part of the country that you reside in, gas-burning heating systems can be either an absolute necessity or a rarity. For those that maintain, service and install gas heating systems or those just looking for a more in-depth source of accurate information, this modular training program focuses on furnaces and boilers that burn natural gas or LP. The combustion of gas to generate heat can be dangerous and should be thoroughly understood by HVAC technicians. This program covers many facets of gas heating including: combustion, system components and controls, heating sequences, installation, and troubleshooting. Through advancements in technology, modern heating systems have become far more efficient than their predecessors. Integrated circuit boards and electronic ignition systems have replaced the mechanical controls and manually lit pilots of older systems. Today, technicians may encounter furnaces or boilers that are older than they are, complex high-efficient systems, or anything in between. It is critical that they have a working knowledge of all these systems. This manual provides students and practicing technicians with the information and knowledge necessary to safely work on systems that incorporate gas combustion to provide heat. The information to service, maintain, and install these systems is also presented in an easy-to-understand format. The manual is full of color images and diagrams and includes end-of-chapter worksheets. Gas Heating was written to be a primary text that focuses specifically on gas-burning heating systems which can be used as a stand-alone text or a supplement to your current text book. |
| a common problem in direct spark ignition systems is: Fundamentals of Medium/Heavy Duty Diesel Engines Gus Wright, 2015-12-16 Jones & Bartlett Learning CDX Automotive--Cover |
| a common problem in direct spark ignition systems is: Principles of Home Inspection: Gas & oil furnances Carson Dunlop, 2003 Home inspectors must understand how heat is generated, how it is spread around, how it is controlled and how it is made safe. This text also discusses how to discard the waste products of heating, how much heat is needed, and why homes can be uncomfortable even when enough heat is provided. This in-depth book addresses these issues for two of the most common home heating methods--gas and oil furnances. |
| a common problem in direct spark ignition systems is: Heating systems specialist (AFSC 54750) Rodney S. Dunaway, 1984 |
| a common problem in direct spark ignition systems is: Industrial Combustion Testing Charles E. Baukal, Jr., 2010-07-29 The first resource of its kind, this work compiles all of the latest testing techniques to serve as a comprehensive resource for those conducting tests in the field of industrial combustion. It serves the needs of practicing engineers, technicians, and researchers conducting experiments with industrial scale combustion equipment, and it will save researchers endless hours searching the literature. It includes numerous pictures, figures, graphs, and tables, as well as examples on how to apply the information. It includes valuable information on advanced diagnostics, burner and flare testing, and testing in combustors, including a variety of kilns, furnaces, and boilers. |
| a common problem in direct spark ignition systems is: Advances in Automotive Control 1995 L. Guzzella, U. Kiencke, 2016-01-07 Automotive Control is a rapidly developing field for both researchers and industrial practitioners. The field itself is wide ranging and includes engine control, vehicle dynamics, on-board diagnosis and vehicle control issues in intelligent vehicle highway systems.Leading researchers and industrial practitioners were able to discuss and evaluate current developments and future research directions at the first international IFAC workshop on automotive control. This publication contains the papers covering a wide range of topics presented at the workshop. |
| a common problem in direct spark ignition systems is: Assessment of Fuel Economy Technologies for Light-Duty Vehicles National Research Council, Division on Engineering and Physical Sciences, Board on Energy and Environmental Systems, Committee on the Assessment of Technologies for Improving Light-Duty Vehicle Fuel Economy, 2011-06-03 Various combinations of commercially available technologies could greatly reduce fuel consumption in passenger cars, sport-utility vehicles, minivans, and other light-duty vehicles without compromising vehicle performance or safety. Assessment of Technologies for Improving Light Duty Vehicle Fuel Economy estimates the potential fuel savings and costs to consumers of available technology combinations for three types of engines: spark-ignition gasoline, compression-ignition diesel, and hybrid. According to its estimates, adopting the full combination of improved technologies in medium and large cars and pickup trucks with spark-ignition engines could reduce fuel consumption by 29 percent at an additional cost of $2,200 to the consumer. Replacing spark-ignition engines with diesel engines and components would yield fuel savings of about 37 percent at an added cost of approximately $5,900 per vehicle, and replacing spark-ignition engines with hybrid engines and components would reduce fuel consumption by 43 percent at an increase of $6,000 per vehicle. The book focuses on fuel consumption-the amount of fuel consumed in a given driving distance-because energy savings are directly related to the amount of fuel used. In contrast, fuel economy measures how far a vehicle will travel with a gallon of fuel. Because fuel consumption data indicate money saved on fuel purchases and reductions in carbon dioxide emissions, the book finds that vehicle stickers should provide consumers with fuel consumption data in addition to fuel economy information. |
| a common problem in direct spark ignition systems is: Resistive, Capacitive, Inductive, and Magnetic Sensor Technologies Winncy Y. Du, 2014-12-09 Sensor technologies have experienced dramatic growth in recent years, making a significant impact on national security, health care, environmental improvement, energy management, food safety, construction monitoring, manufacturing and process control, and more. However, education on sensor technologies has not kept pace with this rapid development |
| a common problem in direct spark ignition systems is: Advanced Microsystems for Automotive Applications Yearbook 2002 Sven Krueger, Wolfgang Gessner, 2012-02-02 Microsystems are an important success factor in the automobile industry. In order to fulfil the customers requests for safety convenience and vehicle economy, and to satisfy environmental requirements, microsystems are becoming indispensable. Thus a large number of microsystem applications came into the discussion. With the international conference AMAA 2002, VDI/VDE-IT provides a platform for the discussion of all MST relevant components for automotive applications. The conference proceedings gather the papers by authors from automobile suppliers and manufacturers. |
| a common problem in direct spark ignition systems is: Internal Combustion Engine Handbook Richard Van Basshuysen, Fred Schaefer, TechTrans, 2016-03-07 More than 120 authors from science and industry have documented this essential resource for students, practitioners, and professionals. Comprehensively covering the development of the internal combustion engine (ICE), the information presented captures expert knowledge and serves as an essential resource that illustrates the latest level of knowledge about engine development. Particular attention is paid toward the most up-to-date theory and practice addressing thermodynamic principles, engine components, fuels, and emissions. Details and data cover classification and characteristics of reciprocating engines, along with fundamentals about diesel and spark ignition internal combustion engines, including insightful perspectives about the history, components, and complexities of the present-day and future IC engines. Chapter highlights include: • Classification of reciprocating engines • Friction and Lubrication • Power, efficiency, fuel consumption • Sensors, actuators, and electronics • Cooling and emissions • Hybrid drive systems Nearly 1,800 illustrations and more than 1,300 bibliographic references provide added value to this extensive study. “Although a large number of technical books deal with certain aspects of the internal combustion engine, there has been no publication until now that covers all of the major aspects of diesel and SI engines.” Dr.-Ing. E. h. Richard van Basshuysen and Professor Dr.-Ing. Fred Schäfer, the editors, “Internal Combustion Engines Handbook: Basics, Components, Systems, and Perpsectives” |
| a common problem in direct spark ignition systems is: The Adlard Coles Book of Outboard Motors Melanie Bartlett, 2012-11-30 Aimed at boatowners rather than experienced mechanics, The Adlard Coles Book of Outboard Motors is a boon to anyone who puts to sea with an outboard engine. Covering both 2 and 4 stroke engines, the book explains how even the most sophisticated of modern outboards use simple processes to convert fuel to power, and then looks at each of the sub-systems that allow those processes to take place: - the fuel system - the ignition system - cooling and lubrication - the electrical system - transmission and controls The book includes sections on routine maintenance and fault finding, and even has a photo sequence showing the vital first aid required to save the life of an outboard engine that has been dropped overboard! 'Explains in clear, jargon-free English how an outboard works and how to look after it' Kelvin Hughes 'An excellent book, well thought out and well written' Motorboats Monthly |
| a common problem in direct spark ignition systems is: How to Restore Your Farm Tractor Robert N. Pripps, 1992 Farmall, Ford, John Deere, International, Case, Allis-Chalmers, Minneapolis-Moline, Oliver, Orphan Makes, and more. Techniques for authentic show and work tractor restoration. |
| a common problem in direct spark ignition systems is: Technological Improvements to Automobile Fuel Consumption C. W. Coon, Southwest Research Institute, 1974 |
| a common problem in direct spark ignition systems is: Defense Industry Bulletin , 1971 |
| a common problem in direct spark ignition systems is: Federal Register , 1979 |
| a common problem in direct spark ignition systems is: The Adlard Coles Book of Outboard Motors Tim Bartlett, 2006-01-01 The Adlard Coles Book of Outboard Motors, previously known as The RYA Book of Outboard Motors, is aimed at all boatowners, rather than experienced mechanics. Covering both 2 and 4 stroke engines, it explains how even the most sophisticated of modern outboards use simple processes to convert fuel to power, and then looks at each section of the sub-systems that allow those processes to take place: the fuel system, the ignition system, cooling and lubrication, the electrical system, transmission and controls. This book includes sections on routine maintenance and fault-finding, and even has a photo sequence showing the vital first aid required to save the life of an outboard engine that has been dropped overboard! It will be invaluable to anyone who puts to sea with an outboard engine. |
| a common problem in direct spark ignition systems is: Carbon Management National Research Council, Division on Earth and Life Studies, Board on Chemical Sciences and Technology, Chemical Sciences Roundtable, 2001-09-15 Considerable international concerns exist about global climate change and its relationship to the growing use of fossil fuels. Carbon dioxide is released by chemical reactions that are employed to extract energy from fuels, and any regulatory policy limiting the amount of CO2 that could be released from sequestered sources or from energy-generating reactions will require substantial involvement of the chemical sciences and technology R&D community. Much of the public debate has been focused on the question of whether global climate change is occurring and, if so, whether it is anthropogenic, but these questions were outside the scope of the workshop, which instead focused on the question of how to respond to a possible national policy of carbon management. Previous discussion of the latter topic has focused on technological, economic, and ecological aspects and on earth science challenges, but the fundamental science has received little attention. This workshop was designed to gather information that could inform the Chemical Sciences Roundtable in its discussions of possible roles that the chemical sciences community might play in identifying and addressing underlying chemical questions. |
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| a common problem in direct spark ignition systems is: The Slipcover for The John Zink Hamworthy Combustion Handbook Charles E. Baukal Jr., 2018-10-03 Despite the length of time it has been around, its importance, and vast amounts of research, combustion is still far from being completely understood. Issues regarding the environment, cost, and fuel consumption add further complexity, particularly in the process and power generation industries. Dedicated to advancing the art and science of industr |
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| a common problem in direct spark ignition systems is: Advanced Direct Injection Combustion Engine Technologies and Development H Zhao, 2009-12-18 Volume 2 of the two-volume set Advanced direct injection combustion engine technologies and development investigates diesel DI combustion engines, which despite their commercial success are facing ever more stringent emission legislation worldwide. Direct injection diesel engines are generally more efficient and cleaner than indirect injection engines and as fuel prices continue to rise DI engines are expected to gain in popularity for automotive applications. Two exclusive sections examine light-duty and heavy-duty diesel engines. Fuel injection systems and after treatment systems for DI diesel engines are discussed. The final section addresses exhaust emission control strategies, including combustion diagnostics and modelling, drawing on reputable diesel combustion system research and development. - Investigates how HSDI and DI engines can meet ever more stringent emission legislation - Examines technologies for both light-duty and heavy-duty diesel engines - Discusses exhaust emission control strategies, combustion diagnostics and modelling |
| a common problem in direct spark ignition systems is: Fundamentals of Electric Circuits Charles K. Alexander, Matthew N. O. Sadiku, 2007 For use in an introductory circuit analysis or circuit theory course, this text presents circuit analysis in a clear manner, with many practical applications. It demonstrates the principles, carefully explaining each step. |
| a common problem in direct spark ignition systems is: Popular Mechanics , 1986-05 Popular Mechanics inspires, instructs and influences readers to help them master the modern world. Whether it’s practical DIY home-improvement tips, gadgets and digital technology, information on the newest cars or the latest breakthroughs in science -- PM is the ultimate guide to our high-tech lifestyle. |
| a common problem in direct spark ignition systems is: Popular Mechanics , 1986-05 Popular Mechanics inspires, instructs and influences readers to help them master the modern world. Whether it’s practical DIY home-improvement tips, gadgets and digital technology, information on the newest cars or the latest breakthroughs in science -- PM is the ultimate guide to our high-tech lifestyle. |
| a common problem in direct spark ignition systems is: Automobile Electrical and Electronic Systems Tom Denton, 2007-06-01 Understanding vehicle electrical and electronic systems is core to the work of every motor vehicle mechanic and technician. This classic text ensures that students and practicing engineers alike keep abreast of advancing technology within the framework of the latest FE course requirements. The new edition includes updated and new material throughout, covering recent developments such as microelectronic systems, testing equipment, engine management systems and car entertainment and comfort systems. New self-assessment material includes multiple choice questions on each of the key topics covered. With over 600 clear diagrams and figures the new edition will continue to be the book of choice for many students taking IMI technical certificates and NVQ level qualifications, C&G courses, HNC/D courses, and their international equivalents, and is also ideal for use as a reference book by service department personnel. |
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| a common problem in direct spark ignition systems is: Hydrogen Fuel for Surface Transportation Joseph Norbeck, Thomas Durbin, James Heffel, Michelle Montano, 1996-09-01 Hydrogen Fuel for Surface Transportation provides background information on the advantages and disadvantages of hydrogen as a fuel, describes the current state of technology of hydrogen-fueled vehicles, and discusses the future requirements of the hydrogen economy. Each chapter also includes reprints of noteworthy articles and technical papers on the subject. |
| a common problem in direct spark ignition systems is: Army Extension Courses United States. Adjutant-General's Office, 1934 |
| a common problem in direct spark ignition systems is: Scientific and Technical Aerospace Reports , 1979 Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database. |
| a common problem in direct spark ignition systems is: Identification of Probable Automotive Fuels Composition, 1985-2000 Southwest Research Institute, 1978 |
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| a common problem in direct spark ignition systems is: Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles National Research Council, Transportation Research Board, Division on Engineering and Physical Sciences, Board on Energy and Environmental Systems, Committee to Assess Fuel Economy Technologies for Medium- and Heavy-Duty Vehicles, 2010-08-30 Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles evaluates various technologies and methods that could improve the fuel economy of medium- and heavy-duty vehicles, such as tractor-trailers, transit buses, and work trucks. The book also recommends approaches that federal agencies could use to regulate these vehicles' fuel consumption. Currently there are no fuel consumption standards for such vehicles, which account for about 26 percent of the transportation fuel used in the U.S. The miles-per-gallon measure used to regulate the fuel economy of passenger cars. is not appropriate for medium- and heavy-duty vehicles, which are designed above all to carry loads efficiently. Instead, any regulation of medium- and heavy-duty vehicles should use a metric that reflects the efficiency with which a vehicle moves goods or passengers, such as gallons per ton-mile, a unit that reflects the amount of fuel a vehicle would use to carry a ton of goods one mile. This is called load-specific fuel consumption (LSFC). The book estimates the improvements that various technologies could achieve over the next decade in seven vehicle types. For example, using advanced diesel engines in tractor-trailers could lower their fuel consumption by up to 20 percent by 2020, and improved aerodynamics could yield an 11 percent reduction. Hybrid powertrains could lower the fuel consumption of vehicles that stop frequently, such as garbage trucks and transit buses, by as much 35 percent in the same time frame. |
