Patent ID: 6182445
Filing Date: 2001-02-06
Classification: F01N,F02D,F02M,Y02T,Y10T

Abstract:
A system for detecting malfunction of an exhaust switch-over valve of an internal combustion engine, for opening/closing a bypass exhaust gas passage, branched from an exhaust pipe of the engine, which stores an adsorbent that adsorbs unburned components of the exhaust gas generated by the engine when the engine is started, comprising:a first temperature sensor, installed at the bypass exhaust gas passage, which detects a first temperature at the bypass exhaust gas passage;detection period setting means for setting a detection period based on a state of opening/closing of the switch-over valve; andvalve malfunction determining means for determining whether the switch-over valve malfunctions based on the detected first temperature during the detection period.