EGR CONTROL METHOD AND EGR DEVICE

[Problem] To be able to reliably detect a reduction in a flow rate of circulated exhaust gas that is associated with secular change and to compensate for the reduction in the flow rate. [Means for Resolution] Whether a distribution property of exhaust gas in an EGR valve (16) for controlling a circulation amount of the exhaust gas to an intake side of an engine (3) is determined on the basis of whether a clogging rate, which is obtained as a ratio of a flow rate of the exhaust gas at a time when the EGR valve (16) is started to be used to a flow rate of the exhaust gas in the EGR valve (16) at a time when the distribution property is determined. In the case where the clogging rate exceeds a determination threshold, such warning that the distribution property of the exhaust gas falls below a specified standard is made, and a flow rate of circulated exhaust gas is corrected in accordance with a degree of degradation of the distribution property.