Diesel Engine Efficiency and Emissions Improvement Via Variable Compression and Expansion Ratios

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$150,000.00
Award Year:
2013
Program:
SBIR
Phase:
Phase I
Contract:
DE-FG02-13ER90445
Award Id:
n/a
Agency Tracking Number:
88134
Solicitation Year:
2012
Solicitation Topic Code:
06d
Solicitation Number:
DE-FOA-0000715
Small Business Information
3744 Plaza Dr., Ann Arbor, MI, 48108-1665
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
602125908
Principal Investigator:
George Schwartz
Dr.
(734) 995-2455
gschwartz@electro-mechanical.net
Business Contact:
George Schwartz
Dr.
(734) 995-2455
gschwartz@electro-mechanical.net
Research Institution:
Stub




Abstract
Diesel compression ratios are normally set high (16:1 to 23:1) for cold starting, yet data show optimum fuel efficiency and emissions occur at compression ratios below 14:1. The industry trend has been to steadily reduce compression ratio. Literature findings indicate that reducing Diesel compression ratio reduces fuel consumption, emissions, allows higher turbo boost, and improves engine life [1]. However, lowering the compression ratio commonly leads to cold starting problems and white smoke during warm-up. The innovation of this proposal allows lower and variable compression in a simple, low cost, energy efficient manner that can be incorporated into existing engine designs. Moreover, this innovation may be retrofitted into many engine types. EMA proposes to develop a two-step valve lifter that closes the intake and exhaust valves early, particularly during cold starting and warmup. The two-step lifter provides two different valve lift profiles. On the intake valve, the reduced lift profile causes early increases the effective compression ratio. On the exhaust valve, early closing retains heat and fuel that would normally escape out the exhaust. Once the engine is warm the normal cam profile can be used to provide an Atkinson / Miller style engine cycle which is known to improve fuel economy and emissions. Commercial Applications and other Benefits The expected product is a two-step, valve lifter combined with a camshaft that normally late intake valve closing that can be used on Diesel engines. A fuel economy improvement of 10% or more is estimated with a reduction in carbon dioxide, particulate and NOx emissions as well. Little or no modification of the engine block and heads is required to implement this technology.

* information listed above is at the time of submission.

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