Patent ID: 9243977
Filing Date: 2016-01-26
CPC Classification: F02D,F02M,F16K,G01M,Y02T

Claim Text:
1. A method for diagnosing a valve in a fluid supply line to a suction line of an air system of a combustion engine, the method comprising: actuating the valve; monitoring a first pressure in the suction line for a change when the valve is actuated; and detecting an error of the valve if the change in the first pressure during the actuation of the valve lies outside a specified reference range; wherein the fluid supply line is part of an exhaust-gas recirculation system or a crankcase ventilation system, wherein a magnitude of the actuation of the valve is taken into account in the diagnosis, wherein the reference range is specified on the basis of operating characteristic values of the air system, wherein the reference range is specified based on at least one of a temperature of the air system, a position of a throttle valve of the suction line, a camshaft position of the combustion engine, an engine speed of the combustion engine, and a position of another valve of the air system, and wherein the reference range is specified based on a pressure differential between the first pressure in the suction line downstream from the valve and a second pressure in the fluid supply line upstream from the valve.