HYDRAULIC DRIVE DEVICE AND CONTROL METHOD OF HYDRAULIC DRIVE DEVICE

• Main Author: MORINO KENJI
• Format: Patent
• Language: English
• Published: 14.10.2010
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; ENGINE PLANTS IN GENERAL; ENGINEERING ELEMENTS AND UNITS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MACHINES OR ENGINES FOR LIQUIDS; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS; PRODUCING MECHANICAL POWER; PUMPS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; STEAM ENGINES; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; THERMAL INSULATION IN GENERAL; WEAPONS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS

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