INTAKE THROTTLE VALVE CONTROL DEVICE FOR ON-VEHICLE DIESEL ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an intake throttle valve control device for an on-vehicle diesel engine increasing a reacceleration property from a deceleration operational state of the engine while maintaining an activation state of an exhaust purifying catalyst.

SOLUTION: The on-vehicle diesel engine is provided with an intake throttle valve 24 disposed to an intake passage 2 and metering intake air. An electronic control unit 7 controls opening of the intake throttle valve 24 to a closed side so as to maintain a high temperature state of a DPNR catalyst device 33 disposed to an exhaust passage 3, in a deceleration operation of the diesel engine. The electronic control unit 7 has an opening control part 71 monitoring an inlet temperature (ethci) of the DPNR catalyst device 33 and controlling opening of the intake throttle valve 24 so that the inlet temperature (ethci) of the monitored DPNR catalyst device 33 becomes an allowable minimum temperature thA maintaining the purifying performance in the deceleration operational state of the engine.

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