STEUERSYSTEM FUER DIE ABGASRUECKFUEHRUNG BEI DIESELMOTOREN

摘要

An exhaust gas recirculation control system for a compression-ignition internal combustion engine or diesel engine including an intake throttle valve in an intake passage and an exhaust gas recirculation passage opening downstream of the intake throttle valve, comprises a shut-off valve in the exhaust gas recirculation passage so that the shut-off valve is closed in the proximity of a full load region of the engine. The system further comprises a link mechanism interlocking the intake throttle valve with the control means of the fuel injection pump, which link mechanism is operative to begin to open the intake throttle valve lagging behind a commencement of an operation of the control means of the fuel injection pump and to completely open the intake throttle valve prior to an arrival of the control means at its full operating position, thereby stabilizing its exhaust gas recirculation control characteristic in low and high load regions, effectively reducing NOx to ensure the stability of the engine in the low load region, reliably preventing black exhaust gases in the high load region and improving the full output of the engine.