FAILURE DIAGNOSTIC DEVICE FOR EXHAUST BRAKE DEVICE, AND CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE PROVIDED WITH EXHAUST BRAKE DEVICE

摘要

PROBLEM TO BE SOLVED: To improve safety by detecting air leak of a bypass passage or an open and close valve attached thereon. ;SOLUTION: In an exhaust brake device non-operation condition (S1), an intake air pressure estimated value P0 in an intake air passage is calculated, based on an engine speed Ne and a throttle valve opening θ (S2-S4), and an intake air pressure P in the intake air passage is detected (S5). It will be diagnosed that there is an air leakage in the bypass passage or the open and close valve, if the detected intake air pressure P is greater than the estimated value P0 (S6). When air leakage is diagnosed, the quantity of fuel supply to an internal combustion engine is reduced (S7) to prevent a rise of internal combustion engine speed especially in speed density type internal combustion engine. A warning lamp is lit (S8) to report an occupant occurrence of air leak.;COPYRIGHT: (C)2001,JPO