CONTROL OF PUMP TORQUE OF ENGINE PUMP UNIT

• Main Authors: MUROTA ISAO, SAMEJIMA MAKOTO, MORIYA NAOYUKI
• Format: Patent
• Language: English
• Published: 09.01.1992
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

PURPOSE:To utilize an engine output sufficiently even when variable displacement pumps are used only partly by forming an absorption torque compensation signal corresponding to a difference between an actual position of a fuel discharge control member and a desired position of it. CONSTITUTION:When a load of an engine 1 is smaller than a set value, an actual rack position signal 10 from an actual rack position detector 7a of a rack operating part 7 is inputted to a control circuit 8, and a difference from a desired rack position signal preliminarily decided to a desired rotation number of the engine 1 is determined. An absorption torque compensation signal formed by a signal corresponding to the difference is converted into an oil pressure by an electricity/oil pressure converting device 9 to be given to regulators 4a, 4b to control inclination angles of swash plates 3a, 3b of variable displacement pumps 2a, 2b. In the case a rapid load fluctuation occurs during work to move an acceleration lever corresponding to the load fluctuation, therefore, the rack position can be regulated to be close to a desired position. An output of the engine 1 can thus be utilized to the maximum.