# US 8,464,526 B2 · Hydraulic pump control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,464,526 B2 - Document ID: US8464526B2 - Status: Granted - Kind: B2 - Application number: 12/367,400 - Filed: 2009-02-06 - Published: 2010-08-12 - Granted: 2013-06-18 - Earliest claimed: 2009-02-06 - Assignees: Illinois Tool Works Inc. - Applicants: Ross Renner - Inventors: Ross Renner - Web page: https://patentgrep.com/patent/US8464526B2 ## CPC - F04B 17/05: driven by internal-combustion engines - B60P 3/14: the object being a workshop for servicing, for maintenance, or for carrying workmen during work (lifting devices for movable platforms or cabins for workmen B66F11/04) - B66C 23/42: with jibs of adjustable configuration, e.g. foldable - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - B60P: VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS (vehicles with special provisions for transporting patients or disabled persons, or their personal conveyances A61G3/00) - B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21) ## Abstract A hydraulic load ramping system, in certain aspects, may utilize load sensing feedback from an engine, thereby reducing the possibility of overloading the engine as well as smoothing the transition between hydraulic load levels. In particular, by ramping between hydraulic load levels, unwanted movement of hydraulically-driven equipment may be minimized. In addition, by efficiently monitoring the load sensing feedback and ramping between hydraulic load levels, the hydraulic output may be maximized. ## Claims ### Claim 1 A service pack, comprising: a hydraulic pump configured to drive a hydraulic system; an engine configured to drive the hydraulic pump; and a controller configured to sense an engine load and to ramp output of the hydraulic pump up or down based at least partially on the engine load. ### Claim 2 (depends on 1) The service pack of claim 1, comprising a generator and an air compressor coupled to the engine. ### Claim 3 (depends on 2) The service pack of claim 2, wherein the controller is configured to sense the engine load from the hydraulic system, the hydraulic pump, the generator, the air compressor, or a combination thereof. ### Claim 4 (depends on 1) The service pack of claim 1, wherein the controller is configured to sense the engine load directly from the engine. ### Claim 5 (depends on 4) The service pack of claim 4, wherein the engine load comprises engine power, engine torque, engine RPM, engine fuel injection quantity, engine exhaust temperature, engine throttle position, or a combination thereof. ### Claim 6 (depends on 1) The service pack of claim 1, comprising a valve in fluidic communication with the hydraulic pump, wherein the controller is configured to control the valve to ramp output of the hydraulic pump up or down. ### Claim 7 (depends on 6) The service pack of claim 6, wherein the hydraulic pump comprises a clutch, and wherein the controller is configured to control the clutch and the valve in tandem to ramp output of the hydraulic pump up or down. ### Claim 8 A system, comprising: a load ramping controller configured to sense engine load associated with an engine based on load sense feedback, wherein the load sense feedback comprises an engine load measured directly from the engine, a hydraulic load associated with a hydraulic pump coupled to the engine, a pneumatic load associated with a compressor coupled to the engine, an electrical load associated with a generator coupled to the engine, or a combination thereof; wherein the load ramping controller is configured to ramp output of the hydraulic pump up or down in response to the load sense feedback and a ramping control scheme. ### Claim 9 (depends on 8) The system of claim 8, wherein the ramping control scheme comprises an order of priority of a plurality of hydraulic loads on the engine. ### Claim 10 (depends on 9) The system of claim 9, wherein at least one of the hydraulic loads comprise a hydraulically-driven crane. ### Claim 11 (depends on 8) The system of claim 8, wherein the load sense feedback comprises engine power, engine torque, engine RPM, engine fuel injection quantity, engine exhaust temperature, engine throttle position, or a combination thereof. ### Claim 12 (depends on 8) The system of claim 8, wherein the load sense feedback comprises the engine load measured directly from the engine, the hydraulic load, the pneumatic load, and the electrical load. ### Claim 13 (depends on 8) The system of claim 8, comprising a valve in fluidic communication with the hydraulic pump, wherein the load ramping controller is configured to control the valve to ramp output of the hydraulic pump up or down. ### Claim 14 (depends on 13) The system of claim 13, wherein the hydraulic pump comprises a clutch, and wherein the load ramping controller is configured to control the clutch and the valve in tandem to ramp output of the hydraulic pump up or down. ### Claim 15 (depends on 8) The system of claim 8, comprising the engine, the hydraulic pump, the compressor, and the generator all disposed in a service pack. ### Claim 16 A method of managing output of a hydraulic pump, comprising: obtaining load feedback associated with an engine and/or a load driven by the engine, wherein the load comprises a hydraulic pump, a compressor, a generator, or a combination thereof and ramping the power output of the hydraulic pump in response to the load feedback. ### Claim 17 (depends on 16) The method of claim 16, comprising measuring the engine power, engine torque, engine RPM, engine fuel injection quantity, engine exhaust temperature, engine throttle position, or a combination thereof, directly from the engine. ### Claim 18 (depends on 16) The method of claim 16, comprising measuring the load from the hydraulic pump, the compressor, the generator, or a combination thereof. ### Claim 19 (depends on 16) The method of claim 16, wherein ramping the power output of the hydraulic pump comprises controlling a valve in fluidic communication with the hydraulic pump. ### Claim 20 (depends on 19) The method of claim 19, wherein ramping the power output of the hydraulic pump comprises controlling a clutch associated with the hydraulic pump.