Fuel composition supply means for driving cycle conditions in spark ignition engines
AssigneesExxonMobil Research and Engineering Company, Toyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Toyota Chuo Kenkyusho
InventorsWalter Weissman, Randall D. Partridge, Bhupender S. Minhas, Guido Sartori, Takanori Ueda, Yoshihiro Iwashita, Kazuhiro Akihama, Satoshi Yamazaki
Life of this patent
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Abstract
A fuel system for on-board vehicle fuel separation to supply engine fuel compositions formulated as a function of driving cycle conditions. The invention results in improvements in one or more of feed efficiency and combustion emissions.
Claims20
A fuel system for supplying a plurality fuels for use in spark ignition, internal combustion engine having a fuel supply comprising:
- a membrane in operable communication with the fuel supply for separating said fuel supply into at least a first fuel and a second fuel in which the first fuel has a RON greater than 100, and an average burn rate greater and a laminar flame speed greater than 105% of isooctane;
- means for supplying the first fuel to the engine under high load conditions;
- and, means for supplying the second fuel to the engine at other than high load conditions.
A fuel system for supplying a plurality of unleaded fuels for use in a spark ignition, internal combustion engine having a CR of 11 or more comprising
- a fuel supply, a membrane in operable communication with the fuel supply for separating said fuel supply into at least a first fuel, and a second fuel, in which the second fuel has a RON less than 90, and a burn rate and a laminar flame speed greater than 105% of isooctane;
- means for supplying the second fuel to the engine at low load conditions;
- and,
- means for supplying the first fuel to the engine at other than low load conditions.
A system for supplying in situ formulated fuels boiling in the gasoline range for use in operating a spark ignition, internal combustion engine having a CR of 11 or more comprising:
- a fuel supply;
- a membrane in operable communication with the fuel supply for separating said fuel supply into at least a first fuel and a second fuel, in which the first fuel having a RON greater than about 100 and the second fuel having a RON less than about 90, both fuels having, an average burn rate greater than 105% of isooctane and a laminar flame speed greater than 105% of isooctane;
- means for supplying at least a portion of the first fuel to the engine at high load condition;
- and
- means for supplying at least a portion of the second fuel to the engine at low load conditions.
A method for operating a vehicle having a spark ignition engine to increase the efficiency and reduce the emissions of the engine under conditions of use comprising:
- supplying a fuel to a fuel separation means;
- separating said fuel into at least first and second fuel by means of a membrane that preferentially permeates aromatics;
- the first fuel having a RON greater than 100, a burn rate greater than 105% of isooctane and a laminar flame speed greater than 105% of isooctane;
- the second fuel having a RON less than 90, a burn rate greater than 105% of isooctane and a laminar flame speed greater than 105% of isooctane;
- and
- supplying at least a first fuel to the engine at about high engine load conditions;
- and
- supplying at least a second fuel to the engine at about low engine load conditions,
- whereby engine efficiency is increased and emissions are reduced.
A fuel system for a motor which having a spark regulation, interval combination engine having a CR of 11 or more comprising:
- a fuel tank for storage or fuel therein;
- a membrane separation device in operable communication with the fuel tank and capable of separating a primary fuel into a fuel having a RON higher than the previous fuel first and second fuel having a RON lower than the previous fuel;
- means for supplying the primary fuel to the separation device when the engine is operating whereby the primary fuel is separated into a first fuel and a second fuel;
- a first fuel accumulation and a second fuel accumulation operably connected to the separator device whereby first and second fuels are accumulated therein when previous fuel is supplied to the separation device;
- means for sensing engine drive cycle conditions;
- means for supplying the first fuel to the engine under a first preselected drive cycle conditions;
- and
- means for supplying the second fuel the engine under a second preselected driving cycle conditions.
Dependencies are inferred from the claim text.