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Summary:PROBLEM TO BE SOLVED: To achieve efficient regeneration treatment while properly preventing the clogging of a diesel engine particulate removal filter. SOLUTION: A hydraulic drive device is provided with: a diesel engine serving as a drive source; a hydraulic pump driven by the diesel engine; a variable-displacement type hydraulic motor driven by pressurized oil discharged from the hydraulic pump; and the diesel engine particulate removal filter for eliminating particulate matters contained in exhaust gases of the diesel engine. In the hydraulic drive device, when a differential pressure between the front and the rear of the diesel engine particulate removal filter is greater than a predetermined threshold, a target value of an engine speed is made lower than a target value of the engine speed with the differential pressure being less than the threshold, while increasing a target value of a pump capacity to be greater than a target value of the pump capacity with the differential pressure being less than the threshold. COPYRIGHT: (C)2011,JPO&INPIT
Bibliography:Application Number: JP20090074973