Patent ID: 7201158
Filing Date: 2007-04-10
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. An exhaust gas recirculation control device in a diesel engine provided with an exhaust gas recirculation path communicating a suction air path with an exhaust gas path, the device comprising: a first temperature sensor provided at a portion more on the upstream side than a portion where said suction air path joins the exhaust gas recirculation path; a second temperature sensor provided at a portion more on the downstream side than a portion where said suction air path joins the exhaust gas recirculation path; an engine load detection sensor; an engine speed detection sensor; memory means storing, in advance, a temperature of a suction air before being mixed with an exhaust gas, and a temperature value at said second temperature sensor installation position corresponding to an appropriate exhaust gas recirculation amount which is uniquely defined by an engine load and an engine speed; and judging means comparing the temperature value stored in said memory means corresponding to the detected values detected from said engine load detection sensor, the engine speed detection sensor and the first temperature sensor, with the detection value detected by said second temperature sensor, determining that the recirculation exhaust gas amount is appropriate in the case that said detection value is within a predetermined range relative to said temperature value, and determining that the recirculation exhaust gas amount is abnormal in the case that said detection value is not within the predetermined range relative to said temperature value.