Mazda Expects 30 Percent Enhanced Fuel Economy with Skyactiv 2 Engines Come 2020
January 6, 2014 12:48 PM
comment(s) - last by
Mazda is already discussing Skyactiv 3 as well
Mazda only recently started introducing its
to its different vehicle models, but the automaker is already talking about the upcoming Skyactiv 2 -- and even Skyactiv 3 -- engines for the next decade and beyond.
According to a new report from
, Mazda plans to gain 30 percent better fuel economy with its Skyactiv 2 engines, which are expected to have a 2020 release date. A 30 percent improvement in fuel economy would make the already impressive Mazda3 rise from 29/41 mpg (city/highway) in its more efficient trim to 38/53 on regular unleased gasoline.
plans to achieve this 30 percent increase in fuel economy by improving the internal combustion of the Skyactiv 2 engines. More specifically, the Skyactiv 2 engine's compression ratio would be bumped up to 18:1 from a current level of 14:1.
This higher compression is able to reach the same combustion temperature as the current engines, but with a leaner mix of fuel -- meaning improved fuel economy.
The Skyactiv 2 engines will utilize homogeneous charge compression ignition (HCCI), which compresses the fuel-air mixture to a high enough pressure and temperature that it ignites by itself without needing a spark. This allows for more complete fuel combustion and lower nitrogen oxide emissions.
report indicates that HCCI won't come easy. Engineers must first expand the range of engine speeds for HCCI specifically, because the engine revving too quickly can result in a misfire due to the high number of revolutions, and if revved too slowly, it can misfire due to low temperatures.
2.0-liter Skyactiv four-cylinder engine
Aside from that, engine cooling and the engine's tendency to behave differently based on the use of different fuels need to be figured out.
The main goal with Skyactiv 2 is to meet European
carbon dioxide emissions
standards of 95 grams per kilometer in 2020, but Mazda is looking even further ahead at meeting Europe's standards of 65 grams per kilometer in 2025 with Skyactiv 3.
Mazda didn't go into great detail about Skyactiv 3, but the automaker plans to make more energy available for powering the wheels by limiting the fluctuation of heat in the combustion chamber and reduce losses from exhaust and cooling. Mazda hopes to reach well-to-wheel carbon dioxide emissions with Skyactiv 3 that rival electric vehicles.
Mazda first introduced Skyactiv engines to the U.S. market in 2011, starting with the Mazda3 sedan. Since then, they've been added to the Mazda6 sedan and CX-5 crossover.
Mazda has been trying to bring the Skyactiv-D diesel engine to the U.S. via the Mazda6, and was supposed to have achieved this by the second half of 2013. However, in September of last year, it was announced that
delays in emissions testing
has pushed that timetable to late spring of 2014.
This article is over a month old, voting and posting comments is disabled
1/7/2014 12:07:53 PM
The math is simple: thermal efficiency=(1-(1/CR^(specific heat-1)). I just did it and the improvement from 13:1 to 14:1 is 1.6%.
Unless you have scientific sources for those MPG numbers, the differences you cite are just anecdotal and thus suspect. I'm not saying you are wrong, but I can't assume you are right. According to the manufacturer's website, the CX-5 (2.0 manual) is rated at ~39mpg(US) combined on the British cycle and 29mpg(US) combined on the American cycle. Certainly a huge difference, but so are the drive cycles...
Mazda refers to the peak of their "dynamic" CR as though it were the static CR, as stated by nearly every car manufacturer since cars were invented. Late intake valve closure (LIVC), as pioneered by Ralph Miller with his work on industrial diesel engines, has muddied the water. As with any internal combustion engine, the value that really matters is the pressure ratio, as the CR refers to a geometric quantity.
The purpose of GDI is to increase volumetric efficiency, intake charge cooling and fuel metering. Nearly every engine in America is designed to run at stoichiometry (14.7:1) unless peak power is required (e.g. acceleration). Running lean results in high NOx and is almost always avoided. Notable exceptions include Honda hybrid vehicles, which use a NOx adsorption catalyst that it periodically flushes by running rich.
"DailyTech is the best kept secret on the Internet." -- Larry Barber
Emissions Testing Delays Mazda's U.S. Diesel Engine Launch Until Late Spring '14
September 13, 2013, 9:54 AM
Mazda to Bring Diesel Engine to U.S. by '14
January 18, 2012, 11:00 AM
Ford, Toyota, and Universal Pictures Celebrate "Back to the Future Day' in Style
October 21, 2015, 4:19 PM
Consumer Reports Flexes Muscle, Hits Slumping Tesla Motors Stock
October 20, 2015, 4:13 PM
Debunked: Beneath the Lies, Nigerian "Pee Generator" Is Still Pissing Into the Wind
October 19, 2015, 7:53 PM
Hot Air? President Obama, G7 Pledge to Eliminate Most Fossil Fuel Use by 2100
June 8, 2015, 5:40 PM
Study Predicts Self-Driving Vehicles Could Rake in Billions
March 6, 2015, 8:34 AM
Dual-Motor Tesla Model S P85D's "Insane Mode" Shocks Passengers
January 28, 2015, 11:18 PM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2016 DailyTech LLC. -
Terms, Conditions & Privacy Information