Process and system for improving combustion and exhaust aftertreatment of motor vehicle engines
First Claim
1. A diesel combustion engine system comprising:
- a diesel combustion engine having a liquid fuel intake, an air intake, a reformate intake, and an exhaust outlet;
a liquid diesel fuel source in fluid communication with said liquid fuel intake and an on-board catalytic partial oxidation fuel reformer that receives a supply of hydrogen-containing liquid diesel fuel and a supply of air and produces therefrom a hydrogen-rich reformate;
an exhaust conduit in fluid communication with said exhaust outlet and with said reformer, said exhaust conduit comprising a reformate conduit upstream from exhaust aftertreatment components selected from the group consisting of oxidation catalysts, NOx adsorbers, particulate filters, and combinations thereof; and
control means for;
(a) supplying, under conditions of low engine load, reformate or a combination of liquid diesel fuel and reformate to said engine, (b) supplying, under conditions of medium engine load, a combination of liquid diesel fuel and reformate to said engine, and (c) supplying, under conditions of high engine load, liquid diesel fuel only to said engine and reformate only to said exhaust conduit.
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Accused Products
Abstract
A diesel combustion engine system providing improved fuel combustion and exhaust aftertreatment includes: a diesel combustion engine having a liquid fuel intake, an air intake, a reformate intake, and an exhaust outlet; a liquid diesel fuel source in fluid communication with the liquid fuel intake and an on-board catalytic partial oxidation fuel reformer that receives a supply of hydrogen-containing liquid diesel fuel and a supply of air and produces therefrom a hydrogen-rich reformate. An exhaust conduit in fluid communication with the exhaust outlet and the reformer includes a reformate conduit upstream from exhaust aftertreatment components. The system provides for supplying: under conditions of low engine load, reformate or a combination of liquid diesel fuel and reformate to the engine; under conditions of medium engine load, a combination of liquid diesel fuel and reformate to the engine; and, under conditions of high engine load, liquid diesel fuel only to the engine and reformate only to the exhaust conduit.
21 Citations
18 Claims
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1. A diesel combustion engine system comprising:
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a diesel combustion engine having a liquid fuel intake, an air intake, a reformate intake, and an exhaust outlet;
a liquid diesel fuel source in fluid communication with said liquid fuel intake and an on-board catalytic partial oxidation fuel reformer that receives a supply of hydrogen-containing liquid diesel fuel and a supply of air and produces therefrom a hydrogen-rich reformate;
an exhaust conduit in fluid communication with said exhaust outlet and with said reformer, said exhaust conduit comprising a reformate conduit upstream from exhaust aftertreatment components selected from the group consisting of oxidation catalysts, NOx adsorbers, particulate filters, and combinations thereof; and
control means for;
(a) supplying, under conditions of low engine load, reformate or a combination of liquid diesel fuel and reformate to said engine, (b) supplying, under conditions of medium engine load, a combination of liquid diesel fuel and reformate to said engine, and (c) supplying, under conditions of high engine load, liquid diesel fuel only to said engine and reformate only to said exhaust conduit. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 15)
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7. A process for improving fuel combustion and exhaust aftertreatment in a diesel engine, said process comprising:
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producing a hydrogen-rich reformate from hydrogen-containing liquid diesel fuel supplied to an on-board catalytic partial oxidation fuel reformer from a liquid diesel fuel source in fluid communication with said reformer and with a diesel combustion engine having a liquid fuel intake, an air intake, a reformate intake, and an exhaust outlet;
supplying, under conditions of low engine load, reformate or a combination of liquid diesel fuel and reformate to said engine;
supplying, under conditions of medium engine load, a combination of liquid diesel fuel and reformate to said engine; and
supplying, under conditions of high engine load, liquid diesel fuel only to said engine and reformate only to an exhaust conduit in fluid communication with said exhaust outlet and with said reformer, said exhaust conduit comprising a reformate conduit upstream from exhaust aftertreatment components selected from the group consisting of oxidation catalysts, NOx adsorbers, particulate filters, and combinations thereof;
wherein fuel combustion is improved under conditions of low engine load and medium engine load, and exhaust aftertreatment is improved under conditions of high engine load. - View Dependent Claims (8, 9, 10, 11, 12, 16, 17, 18)
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Specification