Method and an apparatus to control the temperature of an engine exhaust gas purifying device

Patent · Tue Jul 01 04:00:00 EDT 1980

OSTI ID:5136602

Masaki, K; Miyamori, Y

A description is given of an internal combustion engine having an induction system including an air-fuel mixture forming means, a combustion chamber, an exhaust system including an exhaust purifying device and an exhaust gas recirculation system interconnecting said induction and exhaust systems, a method of rapidly raising and lowering the temperature in said prifying device between a predetermined upper temperature and a predetermined lower temperature comprising the steps of: recirculating exhaust gas from said exhaust system to said induction system for lowering the peak combustion temperature in said combustion chamber; sensing the temperature prevailing in said purifying device; generating a first command signal when said temperature in said purifying device is sensed at or below said lower temperature and continuing to generate said command signal until said temperature in said purifying device rises to said upper temperature; generating a second command signal when said temperature in said purifying device is sensed at or above said uper temperature and continuing to generate said second command signal until said temperature in said purifying device decreases to said lower temperature; raising the temperature in said purifying device in response to said first command signal by: enriching the air-fuel mixture produced by said air-fuel mixture forming means; retarding the ignition timing of the ignition of said enriched air-fuel mixture in said combustion chamber; supplying secondary air into said exhaust system upstream of said purifying device; and producing sparking in said purifying device so as to positively ignite the large amount of combustible matter issuing from said combustion chamber due to said retarded ignition and enriched air-fuel mixture thus negating the effect of the lowering of the peak combustion temperature.

• Assignee: Nissan Motor Co Ltd (Japan)
• Patent Number(s): US 4209981
• OSTI ID: 5136602
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
CONTROL
DESIGN
ELECTRIC DISCHARGES
ELECTRIC SPARKS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FUEL-AIR RATIO
GASEOUS WASTES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL EQUIPMENT
PURIFICATION
TEMPERATURE CONTROL
WASTES