Particulate trap system for an internal combustion engine
This patent describes an exhaust cleaner and burner system for use in the exhaust system of an internal combustion engine. It comprises an exhaust filter means having an inlet and an outlet: a burner, having an outlet upstream of the filter means and operable to raise the temperature of the filter means; an exhaust conduit for conducting exhaust gas from the engine to the inlet of the burner; an exhaust pressure regulating valve disposed within the exhaust conduit, upstream of the burner, and actuable to restrict exhaust gas flow through the burner and raise the pressure upstream of the valve; a bypass conduit for diverting exhaust gas around the burner and filter means when the exhaust pressure regulating valve is in the restricted position; a pressure relief valve disposed within the bypass conduit having a valve member biased towards a normally closed position and a locking means positionable in a first, locked mode to maintain the valve in the normally closed position and a second, unlocked mode to allow the valve to open against the biasing means; control means operable to position the EPR valve in a nonrestrictive position and the locking means of the pressure relief valve in the locked mode to direct exhaust gas exiting the engine through the filter means, and operable to position the exhaust pressure regulating valve in the restrictive position and the locking means of the pressure relief valve in an unlocked position to restrict the flow of exhaust gas through the burner and the filter means thereby increasing exhaust system pressure upstream of the exhaust pressure regulating valve to a predetermined level sufficient to overcome the pressure relief valve and allow exhaust gas to enter the bypass conduit.
- Assignee:
- General Motors Corp., Detroit, MI (United States)
- Patent Number(s):
- A; US 5063737
- Application Number:
- PPN: US 7-575915
- OSTI ID:
- 5935582
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330705* -- Emission Control-- Particulates
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR FILTERS
AIR POLLUTION CONTROL
CONTROL
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FILTERS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
PARTICLES
PARTICULATES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT