초록 ▼

A particulate and exhaust emission control system for a vehicle (10) having a diesel engine (12). The control system has a particulate trap (24) connected to the exhaust manifold (22) of the diesel engine, an additive tank (30) for storing a fuel additive decomposed by the engine's combustion proces

A particulate and exhaust emission control system for a vehicle (10) having a diesel engine (12). The control system has a particulate trap (24) connected to the exhaust manifold (22) of the diesel engine, an additive tank (30) for storing a fuel additive decomposed by the engine's combustion process to form a reducible metal oxide capable of depressing the ignition temperature of the carbon particulates collected by the particulate trap (24) and a metering mechanism (34) responsive to the adding of diesel fuel to the vehicle's fuel tank (28) to add a quantity of the fuel additive to the diesel fuel in the fuel tank (28) to maintain a predetermined ratio of the fuel additive to the diesel fuel in the tank. The metal oxide depressing the ignition temperature of the carbon particulates collected by the particulate trap (24) to a temperature obtained by the particulate trap during selected operating parameters of the diesel engine (12). The particulate trap (24) includes a honeycomb ceramic filter element (38) having inlet channels (44) for collecting the carbon particulate and exit channels (46) coated with a catalyst to oxidize carbon monoxide and unburned hydrocarbons in the exhaust.

대표청구항 ▼

[ We claim:] [1.] A particulate and exhaust gas emission control system for an automotive vehicle having a fuel tank and a diesel engine, said control system comprising:a particulate trap connectable to an exhaust manifold of said diesel engine, said particulate trap having a plurality of parallel i

[ We claim:] [1.] A particulate and exhaust gas emission control system for an automotive vehicle having a fuel tank and a diesel engine, said control system comprising:a particulate trap connectable to an exhaust manifold of said diesel engine, said particulate trap having a plurality of parallel inlet and outlet channels separated by porous longitudinal walls, said porous longitudinal walls permitting the exhaust gases to pass from said inlet channels to said outlet channels, said inlet channels collecting therein the carbonaceous particulates contained in the exhaust gases and said outlet channels having a thin layer of a catalytic metal disposed directly on the surfaces of said porous longitudinal walls along the length thereof to promote the oxidation of carbon monoxide and unburned hydrocarbons in the exhaust gases, said layer of catalytic metal extending into the pores of said porous longitudinal walls so as to increase the surface area of said catalytic metal to said exhaust gases;an additive tank for storing a fuel additive effective to depress the ignition temperature of the carbonaceous particulates collected in the particulate trap; andmetering means for metering said fuel additive to said fuel tank in response to fuel being added to said fuel tank, said metering means adding a quantity of said fuel additive to said fuel tank proportional to the quantity of fuel added to maintain a predetermined ratio between said fuel additive and said fuel in said tank.