Patent ID: 8424288
Filing Date: 2013-04-23
Classification: F01N,F02D,F02M,Y02A,Y02T

Abstract:
1. A method for operating an internal combustion engine in a motor vehicle, the method comprising: supplying air to a combustion chamber via a throttle valve and an air supply channel; conducting exhaust gas through a particulate filter; returning exhaust gas at least intermittently and at least partially through an exhaust gas recirculation valve into the air supply channel; detecting an oxygen proportion in the exhaust gas using at least one lambda probe; controlling, only during an overrun operation, the throttle valve to close and controlling the exhaust gas recirculation valve to open; comparing a variable characterizing the oxygen proportion in the exhaust gas to a boundary value; and at least as a function of the result of this comparison, concluding that there is a leakage in the air supply channel.