Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-10-24
1999-01-12
McGinty, Douglas J.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510184, 510187, 510245, 510262, 510365, 134 20, 134 2212, 134 2214, 134 39, 134167R, 123 1A, 123198A, B08B 900, C11D 732, C11D 750, F02B 7704
Patent
active
058589422
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
The efficient operation of a modern computer-controlled internal-combustion engine depends in part on the ability of the computer of the engine to control accurately the air/fuel ratio and the timing of the spark. Such accurate control requires that critical component parts of the system function at close to optimum O.E.M. values. One common hinderance to optimum operation has been the fouling of engine component parts with carbonaceous deposits.
Several years ago fouling of electronic fuel injectors in automobile engines became a serious problem. Injector cleaners were developed to give some relief to the injector fouling problem. After study of the problem by O.E.M. engineers and oil company chemists, it was concluded that possibly the most serious contributing factor to injector fouling was the presence of high levels of diolefins, sulfides and other polar compounds in gasolines. Other contributing factors included exhaust gas from exhaust-gas recirculation "EGR," positive crankcase ventilation ("PCV") gas, positioning of injectors close to the intake valves receiving hot back-soak temperatures, and location of injector spray pintles close to the outer tips of the injectors.
In answer to the problem of fuel-injector fouling, certain manufacturers of electronic fuel injectors redesigned their injectors. In addition, certain O.E.M.'s repositioned their injectors further back from the intake valves. Oil companies significantly reduced diolefins, sulfides, and other polar compounds in gasoline, and, in addition, the companies began to add alkylamine detergents to gasoline to help keep injectors clean. As a consequence, fuel injector deposit problems have been reduced significantly, although cleaning is occasionally still needed. However, deposits on other engine fuel areas remained a problem; e.g. intake valves, spark plugs, combustion chambers, and oxygen sensors.
With the passage of time, workers in the art were successful in developing several generic approaches for obviating the foregoing limitations. Briefly, these techniques included the following. composition directly into an open air throttle on the carburetor with the engine operating at a high rpm level. In this procedure, the cleaner employed is admixed with the fuel and the combination burned during the combustion process. As the cleaning liquid flows over the bottom of the intake runners in this operation, approximately 30% of the surfaces are cleaned. container having contained therein an engine fuel and a cleaning agent in a ratio of about four parts fuel to one part cleanser. The pressurized container is connected to a transfer apparatus which is then adapted to the injector fuel rail of the engine. The fuel system is the disabled and the engine operated on the fuel/cleaner mixture from the pressurized container. This technique has been found to clean the fuel injector satisfactorily but does not appear effect cleansing of the intake valves or valve seats. line on the air intake plenum and then connecting a rubber flex line to the vacuum outlet. Following, the other end of the flex line is inserted into a container of cleaning fluid. At that juncture, the engine is started and the vacuum used to evacuate the cleaning fluid from the container into the plenum. The cleaning fluid then follows the route of least resistance to the center of gravity down the plenum from the point of entry. Studies have revealed that some intake runners get the major portion of the cleaning fluid while others get none. A further limitation of this procedure arises in that the cleaning fluid does not come into contact with the injectors and therefore provides limited or no cleaning. fuel injectors together with upper engine components wherein chemical compositions are added to the fuel tank of a vehicle, cleansing being effected as the vehicle is operated. In the operation of such process it is common to employ 100 parts of fuel to one part of cleaning fluid. Studies of such processes have revealed that the use of high levels of polybuteneamine fuel
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Adams Lawrence J.
Hughett Paul D.
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