Posted by Mike Levine | June 8, 2009
A aitionist twin-fuel agent from Ford, code-named “Bobcat,” that variably blends gasoline and booze on appeal to apprehend diesel-like achievement continues to accomplish abiding advance in its development, according to presentations fabricated by the automaker to the Department of Energy and Society of Automotive Engineers in April. The presentations additionally accommodate a aboriginal attending at the engine’s architectonics and accomplish some arresting claims about “E85-optimized” agent adeptness against size.
The Bobcat agent starts with a baby turbocharged agent with abstracted gasoline and booze (E85) ammunition injectors for anniversary cylinder. The gasoline arrangement mixes ammunition and air in the motor’s assimilation assorted application anchorage injection. The additional arrangement uses absolute bang to acquaint baby amounts of booze anon into the agitation alcove to ascendancy abortive detonation, or knock, which after-effects from the aerial temperature and burden of a turbocharged engine. The booze prevents beating by cooling the air/fuel admixture until the agent is accessible for combustion. With beating suppressed, the compression arrangement can be increased.
Ford’s engineering partner, Booze Advocacy Systems, LLC of Cambridge, Mass., has trademarked the appellation “DI Octane Boost” to call the process; the absolute bang of booze finer increases the octane of approved gasoline from 88-91 octane to added than 150 octane.
The allotment mix of gasoline and booze varies according to load. In low- to medium-load conditions, alone port-injected gasoline may be required. Direct-injected booze is added and added as a action of bulk but alone in the bulk all-important to anticipate knock. Application such technology, a 5.0-liter V-8 Bobcat agent could potentially aftermath 500 application and 750 pounds-feet or added of torque.
Two 3-D computer-rendered diagrams included in Ford’s DOE presentation appearance the advanced and rear angle of such an agent application a 90-degree V-block design. Two massive air/water calefaction exchangers sit aloft the agent to air-conditioned turbocharged air afore it enters the burke anatomy and assimilation manifold. Twin turbos sit on the lower appropriate and larboard sides.
A abstracted agent cutaway diagram of a Bobcat motor shows the accession of a gasoline anchorage injector and booze absolute injector. The gasoline and booze would be stored in two abstracted ammunition tanks.
EBS claims that about to today’s accepted anchorage ammunition injected gasoline engines in cars and light-duty trucks, direct-injection booze advocacy would accommodate a ammunition adeptness accretion for archetypal accumulated city/highway active of 25 to 30 percent, at an incremental bulk of $1,100 to $1,500, depending on the admeasurement of the vehicle. The adeptness accretion and torque are commensurable to accepted turbodiesel engines, like Ford’s 350-hp/650 lbs.-ft. 6.4-liter Power Stroke, but at about a third of the bulk and with the advantage of cleaner emissions after big-ticket bankrupt aftertreatment hardware.
Ethanol advocacy additionally promises 5 to 10 percent greater ammunition abridgement than Ford’s new band of gasoline-turbocharged direct-injection EcoBoost engines, which it’s based on. Ford’s DOE presentation says, “The E85 optimized agent and the bifold ammunition abstraction are analytic extensions of Ford’s ‘EcoBoost’ strategy.”
Another way to admeasurement efficiency, behindhand of agent architecture, is through a metric alleged Brake Beggarly Effective Pressure. BMEP quantifies the bulk of assignment an agent can do against its displacement by barometer the boilerplate burden exerted on an engine’s pistons. The added able an agent is, the college its BMEP score.
According to Ford’s SAE presentation, an beginning 3.5-liter GTDI EcoBoost agent adapted with E85 absolute bang and gasoline anchorage ammunition bang run on a dynamometer accomplished a BMEP account of 305 psi (27 bar), which translates to about 553 pounds-feet of torque and 316-hp at 3,000 rpm (flat torque ambit from 1,500 to 3,000 rpm). The beginning agent was bound by the agent block’s adeptness to handle college compression ratios. In comparison, a accepted GTDI EcoBoost agent on a dyno was rated at 17 bar, which translates to about 350 pounds-feet of torque and 300-hp at 4,500 rpm (flat torque ambit from 1,500 to 4,500 rpm).
As we mentioned earlier, booze use increases with agent load. A abeyant check to the Bobcat agent would be admission to an booze refueling infrastructure, abnormally back a barter is alive adamantine affairs a bivouac or aggressive hills.
Ford’s SAE presentation provides several ambit estimates for refueling a 5.0-liter Bobcat V-8 with a 10 gallon E85 catchbasin and 26 gallon gas catchbasin compared to a accepted Ford F-150 with a 5.4-liter V-8 and 26 gallon gas tank. Beneath balmy active conditions, the 5.0-liter E85 catchbasin ability accept to be refilled alone already every 20,000 afar and the gas catchbasin refilled every 528 miles. Today’s 5.4-liter V-8 is said to accept a 486 mile ambit beneath these conditions. However, an acute towing book with the 5.0-liter V-8 affairs a fully-loaded bivouac up a connected 6 percent brand could beggarly refilling the E85 catchbasin as generally as every 100 miles. That would be added generally than the gas tank, which has an accepted ambit of 243 afar beneath those conditions. Today’s 5.4-liter V-8 is said to accept a 99 mile ambit beneath these conditions.
If the booze catchbasin did run dry, the Bobcat agent could accomplish indefinitely with lower achievement application alone gasoline until a antecedent of E85 could be found.
Under best operating conditions, however, Ford’s Bobcat agent could be the appropriate powertrain at the appropriate time to accommodated anew allowable accumulated boilerplate ammunition abridgement requirements that crave ammunition adeptness accepted for all ablaze trucks (crossovers, auto trucks, SUVs and vans) to acceleration to 30 mpg by 2016, from 23.1 mpg today.
Will it assignment in the absolute world? Ford will try out its theories alfresco of computer simulations and the class afore the end of the year back a Bobcat agent is activated in an F-Series auto for the aboriginal time.
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