Method for verifying sealability of selected exhaust valve of selected cylinder in internal combustion engine in motor vehicle, involves concluding sealability of valve based on measured values of lambda sensor in one of exhaust gas strands

摘要

The method involves opening exhaust valves (12a-12f) at one of exhaust gas strands in a clock pulse, during association of a selected exhaust valve (14a) at the other exhaust gas strand. A selected cylinder (10a) is pressurized with fuel such that an air-fuel-ratio in an exhaust gas or grease of the selected cylinder is different from an air-fuel-ratio in the exhaust gas of all other cylinders (10b-10f). Sealability of the selected exhaust valve is concluded based on measured values of a lambda sensor (28) i.e. broadband lambda sensor, in one of the exhaust gas strands.