Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1992-01-13
1993-12-07
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
F16D 3102
Patent
active
052674410
ABSTRACT:
An apparatus for limiting the power output of a hydraulic system is disclosed. The hydraulic system has a variable displacement pump. The variable displacement pump has a movable swashplate and is driven by a source of motive power. The apparatus includes a memory device for storing a set of power modes. Each power mode has a predetermined power level associated with the hydraulic system and is defined by a plurality of set points. Each set point corresponds to a predetermined flow rate and discharge pressure of the pump. A device senses the speed of the source of motive power and producing a signal representative of the actual speed in response to the sensed speed. A device senses the pressure of the variable displacement pump and produces a signal representative of the actual pressure in response to the sensed pressure. A device senses the swashplate angle of the variable displacement pump and delivers a signal representative of the actual swashplate angle in response to the sensed swashplate angle. A device receives a desired power mode signal having a desired power level. The desired power level is different from the predetermined power levels associated with the set of power modes. A control device receives the actual speed, pressure and swashplate angle signals, and responsively determines a desired flow limit of the pump. The desired flow limit corresponds to the desired power level.
REFERENCES:
patent: 3821625 (1974-06-01), Scholl
patent: 3927528 (1975-12-01), van der Kolk et al.
patent: 4510750 (1985-04-01), Izumi et al.
patent: 4518318 (1985-05-01), Jensen et al.
patent: 4523892 (1985-06-01), Mitchell et al.
patent: 4534707 (1985-08-01), Mitchell
patent: 4655689 (1987-04-01), Westveer et al.
patent: 4678404 (1987-07-01), Lorett et al.
patent: 4712376 (1987-12-01), Handank
patent: 4718329 (1988-01-01), Nakajima et al.
patent: 4726186 (1988-02-01), Tatsumi et al.
patent: 4741159 (1988-05-01), Gunda et al.
patent: 4809504 (1989-03-01), Izumi et al.
patent: 4823552 (1989-04-01), Ezell et al.
patent: 4967557 (1990-11-01), Izumi et al.
patent: 5048293 (1991-09-01), Aoyagi
patent: 5064351 (1991-11-01), Hamey et al.
patent: 5077973 (1992-01-01), Suzuki et al.
patent: 5129230 (1992-07-01), Izumi et al.
patent: 5170625 (1992-12-01), Watanabe et al.
patent: 5177964 (1993-01-01), Tanaka et al.
Application Ser. No. 07/817,569, filed Jan. 7, 1992, Title: Hydraulic Control Apparatus, Attorney Docket No.: 91-318.
Devier Lonnie J.
Krone John J.
Lunzman Stephen V.
Marsden Howard A.
Caterpillar Inc.
Look Edward K.
Masterson David M.
Ryznic John
LandOfFree
Method and apparatus for limiting the power output of a hydrauli does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for limiting the power output of a hydrauli, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for limiting the power output of a hydrauli will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2008946