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Downsized, Boosted Gasoline Engines WORKING PAPER 2016-21 Downsized, boosted gasoline engines Authors: Aaron Isenstadt and John German (ICCT); Mihai Dorobantu (Eaton); David Boggs (Ricardo); Tom Watson (JCI) Date: 28 October 2016 Keywords: Passenger vehicles, turbochargers, downsizing, 48-volt hybrid, mild hybrid, advanced technologies, fuel-efficiency, technology innovation Introduction body design and lightweighting, and other measures that have occurred since then. Each paper will evaluate: In 2012, the U.S. Environmental Protection Agency (EPA) and the Department of Transportation’s National Highway • How the current rate of progress (cost, benefits, market Traffic Safety Administration (NHTSA) finalized a joint penetration) compares to projections in the rule; rule establishing new greenhouse gas and fuel economy • Recent technology developments that were not standards for vehicles.1 The standards apply to new considered in the rule and how they impact cost and passenger cars and light-duty trucks covering model years benefits; 2012 through 2025. A mid-term review of the standards will • Customer-acceptance issues, such as real-world fuel be conducted in 2017. economy, performance, drivability, reliability, and safety. Assuming the fleet mix remains unchanged, the standards This paper provides an analysis of turbocharged, downsized require these vehicles to meet an estimated combined gasoline engine technology developments and trends. It average fuel economy of 34.1 miles per gallon (mpg) in is a joint collaboration between ICCT, Eaton, Ricardo, JCI, model year 2016, and 49.1 mpg in model year 2025, which BorgWarner, Honeywell, and the ITB Group. The paper equates to 54.5 mpg as measured in terms of carbon relies on data from publicly available sources and data and dioxide emissions with air conditioning refrigerant credits information from the participating automotive suppliers. factored in. The standards require an average improvement in fuel economy of about 4.1 percent per year. Background The technology assessments performed by the agencies to inform the 2017–2025 rule were conducted four to five years ago.2 The ICCT is collaborating with automotive suppliers on TURBOCHARGER TECHNOLOGY AND EFFICIENCY a series of working papers evaluating technology progress IMPACTS and new developments in engines, transmissions, vehicle Internal combustion engines produce power in proportion to the amount of air that flows through them when the appropriate amount of fuel is added to that air and burned. 1 U.S. Environmental Protection Agency & National Highway Traffic Safety For a naturally aspirated engine, that airflow is roughly pro- Administration, “EPA/NHTSA Final Rulemaking to Establish 2017 and portional to the displacement of the engine and the engine Later Model Years Light-Duty Vehicle Greenhouse Gas Emissions and speed.3 Turbochargers increase engine power by increasing Corporate Average Fuel Economy Standards” (2012). https://www3.epa. gov/otaq/climate/regs-light-duty.htm#2017-2025 intake charge air density, thus increasing the mass flow 2 U.S. EPA & NHTSA, “Joint Technical Support Document: Final Rulemaking of air to the engine. This extra air simultaneously requires for 2017-2025 Light-Duty Vehicle Greenhouse Gas Emission Standards additional fuel (to maintain stoichiometric conditions and Corporate Average Fuel Economy Standards” (2012). https://www3. epa.gov/otaq/ climate/regs-light-duty.htm#2017-2025 U.S. NHTSA, “Corporate Average Fuel Economy for MY 2017-MY 2025 Passenger Cars 3 Aaron Isenstadt, John German, Mihai Dorobantu, Naturally aspirated and Light Trucks: Final Regulatory Impact Analysis” (2012). http://www. gasoline engines and cylinder deactivation. (ICCT: Washington DC, 2016). nhtsa.gov/fuel-economy http://www.theicct.org/naturally-aspirated-gas-engines-201606 Acknowledgements: Thanks to Pierre-Jean Cançalon (Honeywell), Sean Osborne (ITB), and Stefan Münz, Dr. Hermann Breitbach, Erika Nielsen, and Dave Lancaster, all of BorgWarner, for their input and reviews. © INTERNATIONAL COUNCIL ON CLEAN TRANSPORTATION, 2016 WWW.THEICCT.ORG DOWNSIZED, BOOSTED GASOLINE ENGINES desirable for modern exhaust aftertreatment technology). compounded by mass reduction in the vehicle due to less Consequently, the direct impacts of turbocharging are to structure required to support and house the engine. increase engine power and fuel flow for a given engine displacement volume. Turbochargers are typically driven by exhaust gas pressure. This process recovers some of the energy remaining in Higher output results in higher combustion pressures which the exhaust gases that would otherwise be lost, but there increase the temperature of the unburned gases being is a delay between the throttle being opened and boost compressed ahead of the flame front, and this leads to pressure building up, due to the inertia of the turbo. This increased knock and detonation. Historically, manufactur- lag in turbo response is generally noticeable only at low ers reduced compression ratios in turbocharged engines engine speed and is mitigated with automatic transmis- to control knock and detonation, leading to efficiency sions that allow engine speed and flow rate to rise rapidly. reductions. Thus, until recently, turbochargers were used Another common strategy to reduce turbo lag is to run the primarily to increase performance in sporty vehicles. Even engine at higher rpm, even though this increases fuel con- though gasoline turbocharged vehicles were introduced in sumption. Turbocharger suppliers are constantly working the United States in 1961, their sales were only 3.3% of the on improving the efficiency of the turbocharger system market as recently as 2010. and reducing the inertia of the rotating components to further reduce turbo lag. These improvements are driven Improvements in turbocharger materials, electronic by peer pressure and competition between suppliers, and controls, and, especially, the introduction of gasoline direct- by vehicle manufacturers whose desire is to replace a larger injection (GDI) have transformed the use of turbocharger displacement naturally aspirated engine with a smaller technology. Previous fueling systems, from carburetors to displacement turbocharged engine with no discernable throttle body fuel injection to port fuel injection, all mixed penalty in vehicle performance feel. the air and fuel before the mixture entered the cylinder. Direct injection injects the fuel directly into the cylinder so Mechanically driven superchargers can be used to reduce that only air flows through the intake valves. Evaporation or eliminate lag, but they are driven directly off of the of the injected fuel creates a cooling effect, reducing com- engine and, thus, lose the efficiency benefit of using waste pression temperatures and, hence, knock and detonation. exhaust heat to drive the compressor. In addition, without It also allows valve timings that promote scavenging of decoupling they have higher friction losses. the cylinder during high-load operation, further reducing charge temperatures while increasing trapped air mass. Use of low-weight materials for turbine or compressor With GDI, the compression ratio in a turbocharged engine wheels, or bearing systems with lower friction, like ball can be higher than with port fuel injection (PFI) and engine bearings, can decrease the lag in turbo response. Pulse efficiency is improved. energy usage—especially for 4-cylinder engines—like Twinscroll or BorgWarner’s DualVolute technology, shows Turbochargers reduce fuel consumption indirectly, by potential not only to improve boosting system characteris- enabling engine downsizing. The increased power density tic but also boundary conditions for the internal combustion provided by a turbo allows the entire engine to be downsized process. while maintaining the same level of performance. At a constant vehicle demand for performance, a smaller dis- Two-stage boosting systems also improve the lag in engine placement engine operates at higher loads, resulting in response. Parallel and serial arrangement of turbochargers lower throttling losses under normal driving conditions, is feasible. Very recently, electrically-driven superchargers, as well as some reduction in heat transfer losses.4 Smaller especially when a small electric motor is coupled with a engines typically also have lower friction losses due to compressor stage (e-boost), have shown promise. They smaller bearings and cylinders. provide fast compressor pressure build up and reduce turbo lag, like conventional superchargers, without losing Weight reduction from the smaller engine decreases the waste heat recovery benefit of the turbocharger. By the work necessary to move the vehicle. This effect is reducing turbo lag, these systems allow further engine downsizing and engine downspeeding without loss of 4 Increased load in the cylinder, or brake mean effective pressure (BMEP), performance. For practical component scale, the e-boost reduces the heat transfer to the cylinder walls and head as a percentage systems generally require higher voltage, 48V, electric of the fuel energy. See, for example, slide 19 of Cheng, Wai. Engine Heat Transfer [PDF document]. Retrieved from MIT Course Number 2.61 architectures, but the 48V system offers a greater potential Lecture Notes website: http://web.mit.edu/2.61/www/Lecture%20notes/ to recover and use regenerative braking energy. Lec.%2018%20Heat%20transf.pdf 2 INTERNATIONAL COUNCIL ON CLEAN TRANSPORTATION WORKING PAPER 2016-21 DOWNSIZED, BOOSTED GASOLINE ENGINES There is
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