US 4,391,095 AGranted

Internal combustion engine with exhaust filter rejuvenation

AssigneeTexaco Inc.

InventorKashmir S. Virk

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Abstract

Control means for a diesel engine in which the engine's power output can be varied by eliminating the function of one or more cylinders during a period of engine operation. Said control means immobilizes at least one, and preferably a number of the engine's cylinders by maintaining the respective intake, and optionally the exhaust valves, in a fixed position. During periods of cylinder immobilization, the engine exhaust gas filter is rejuvenated by incinerating combustible particles therefrom. When exhaust gas is at a relatively low temperature, particle incineration is achieved by injecting fuel into the immobilized cylinder. The fuel is carried by the exhaust gas stream into the filter. In the latter, the fuel/gas mixture when contacted by a catalyst bed, ignites to raise the gas to a sufficient temperature to ignite retained combustible particles.

Claims7

Dependent claims

In a multi-cylinder internal combustion engien 10 having a plurality of cylinders 12, and a primary fuel injection system including a fuel injector 11 communicated with each of said cylinders 12 to inject a primary liquid fuel charge thereto,

intake 17 and exhaust valve 18 sets communicated with each of said cylinders 12, said valve sets being operable between opened and closed positions when the engine is functioning,
a valve override means 41 engaging the intake valve 17 in at least one of said cylinders 12 and being operable to maintain said intake valve 17 in closed position whereby to immobilize said at least one cylinder during a period of engine operation,
power control means communicated with said valve override means and with said primary fuel system, and being operable to discontinue fuel flow to said at least one cylinder when the latter is in immobilized mode,
an exhaust gas filter 24 communicated with the respective engine exhaust valves 18 to receive a stream of hot exhaust gas therefrom,
an exhaust gas filter rejuvenation system including:
supplementary fluid fuel injector means communicated with a source of supplementary fuel and being operable to controllably inject an amount of said supplementary fluid fuel into an immobilized cylinder 12 when said cylinder is in immobilized mode.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/279,913Filed 2 Jul 1981
Granted: 5 Jul 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

F02D 41/029
To purge or regenerate the exhaust gas treating apparatus: the exhaust gas treating apparatus being a particulate filter
F01N 3/023
By means of filters: using means for regenerating the filters, e.g. by burning trapped particles
F01N 3/035
In combination with other devices: with catalytic reactors
F01N 3/2882
Construction of catalytic reactors: catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust…

Family

No related US applications are recorded in the indexed filing history.

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