FIELD: engines and pumps.
SUBSTANCE: control over exhaust gas temperature, increase to recover sold particle filter, is changed over in compliance with engine operating state between first control mode whereat exhaust gas temperature increases without using exhaust gas circulation valve (EGCV) and second control mode whereat exhaust gas temperature increases with the use of EGCV. With EGCV temporarily locked in completely closed position, first control mode is implemented in the entire range wherein second control mode is normally used instead of the second control mode.
EFFECT: minimised probability of executing second control mode despite locked EGCV that results control system failure in increasing exhaust gas temperature necessary for filter recovery.
10 cl, 6 dwg
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