| 摘要 |
PROBLEM TO BE SOLVED: To provide a diesel engine control device which can promote the purification of exhaust gas by effectively utilizing a catalyst through control of air intake system and also utilizing the exhaust gas circulation effectively. SOLUTION: A diesel engine control device is equipped with an air intake throttle valve 11, exhaust gas circulation passage 14, exhaust gas circulation control valve 16, excessive air rate detecting means 19A, exhaust gas purifying catalyst 15, a temp. detecting means 20 to detect the temp. of the cataclyst 15 or a temp. corresponding to the catalyst temp., and a control means 19 which closes the air intake throttle valve 11 if the detected temp. of the means 20 is below the specified level in the low-load operation where the fuel injection amount of the engine sinks below the specified value, wherein the control means 19 increases the opening of the control valve 16 when it 16 is not fully opened and decreases the opening of the throttle valve 11 when the valve 16 is already open fully in case the excessive air rate detected by the means 19A is greater in a certain width than the target excessive air rate under the conditions that the engine is in low-load operation and that the sensed temp. is over the specified level. |
