Lubricant compositions for direct injection engines
a technology of compositions and lubricants, applied in the direction of lubricant compositions, fuels, thickeners, etc., can solve the problems of insufficient lubricant additives, loss of engine compression or catastrophic failure, and insufficient lubricant additives, so as to reduce the amount of deposits, reduce the formation of engine deposits, and reduce the effect of intake valve deposits
Inactive Publication Date: 2015-03-05
AFTON CHEMICAL
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Benefits of technology
The lubricant additive extends engine mileage without loss of efficiency, maintaining performance for over twice the mileage of vehicles without the additive, by effectively reducing intake valve deposits and preventing air flow restriction.
Problems solved by technology
Technical challenges have included fuel management control, exhaust emissions control, injector fouling and engine deposits.
However, SIDI engines do not have port fuel injectors to wash the deposits off the intake valves, so there is no effective removal process that uses fuel or fuel additives.
Hence, deposits may build up over time eventually leading to loss of engine compression or catastrophic failure in the event a piston crown strikes the open valve.
However, it has now been discovered, quite surprisingly, that the intake valve deposits in a SIDI engine arise primarily from the lubricant used in the engine.
Furthermore, it was not expected that a lubricant additive as described herein would be more effective than a fuel additive at reducing intake valve deposits in a SIDI engine.
Method used
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[0091]Two identically equipped 2008 Pontiac Solstice test vehicles using SIDI fuel management were employed in this evaluation. Both vehicles had previously used a conventional fully formulated engine oil in their crankcase, which is an SAE 5W-30 motor oil meeting the ILSAC GF-4 specification. Both vehicles had previously developed pronounced intake valve deposits which would lead to a loss of engine efficiency and have to be mechanically removed in a maintenance process before damaging the engine. The deposits, if left to accumulate, would have lead to eventual seizure of the intake valves in the valve guides and cause damage to the engine.
[0092]Before the start of testing the valves and ports of both vehicles were disassembled, cleaned and reassembled. In Test Vehicle 1, a baseline fully formulated engine oil, as recommended by the manufacturer of the vehicle was used. In Test Vehicle 2, an SAE 5W-30 test oil formulated to meet the ILSAC GF-4 and GF-5 requirements was used. The fo...
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Abstract
A lubricant additive, an crankcase lubricant composition and a method for reducing intake valve deposits in a spark ignition direct injection (SIDI) engine. The lubricant additive includes (a) as a viscosity index improver, one or more ethylene / olefin copolymers derived from at least 40 mole % ethylene monomer units in an amount ranging from about 0.15 to about 0.95 wt. % based on a total weight of the lubricant composition, and (b) from about 0.1 to about 5.0 percent by weight based on a total weight of a lubricant composition of an aromatic compound having a boiling point under standard atmospheric conditions of from about 190° to about 270° C., wherein the lubricant additive is effective to reduce intake valve deposits in a SIDI engine.
Description
RELATED APPLICATIONS[0001]This application is a continuation-in-part of application Ser. No. 13 / 551,836, filed Jul. 18, 2012, now pending.TECHNICAL FIELD[0002]The disclosure relates to lubricant compositions and in particular to additives for improving reducing the amount of intake valve deposits that form adjacent intake valves of a spark ignition direct injection (SIDI) engine.BACKGROUND AND SUMMARY[0003]Spark ignition direct injection (SIDI) engines have been investigated for benefits in fuel economy and reduction in CO2 emissions for over 90 years. Technical challenges have included fuel management control, exhaust emissions control, injector fouling and engine deposits. All vehicle and engine manufacturers worldwide have all indicated a commitment to pursuing SIDI engine technology to improve fuel consumption characteristics of vehicles. However, SIDI engines do not have port fuel injectors to wash the deposits off the intake valves, so there is no effective removal process tha...
Claims
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IPC IPC(8): C10M143/00C10M129/10C10M129/00
CPCC10M143/00C10M129/10C10M129/00C10M127/04C10M2203/06C10M2207/023C10M2207/026C10M161/00C10M2205/022C10M2219/046C10M2223/043C10M2223/045C10N2010/08C10N2020/015C10N2030/04C10N2040/255C10N2010/04C10M125/04
Inventor GUINTHER, GREGORY H.LOPER, JOHN T.
Owner AFTON CHEMICAL