ELECTRONIC CONTROL FOR A HYDRAULICALLY DRIVEN GENERATOR
First Claim
1. A hydraulic system for driving an auxiliary power source, located aboard a vehicle having a primary power source, at a substantially constant speed despite fluctuations in rotational speed of the primary power source, the system comprising:
- a hydraulic pump drivably connectable to the primary power source, the pump having an inlet for receiving fluid, an outlet for discharging fluid under pressure, and a pump displacement control inlet for receiving fluid to control displacement of the pump;
a hydraulic motor drivably connectable to an auxiliary power source, the motor having an inlet for receiving fluid under pressure and an outlet for discharging spent fluid;
a fluid circuit including a supply conduit for conducting fluid discharged by the pump to the motor, a return conduit for returning fluid discharged by the motor to the pump, and a feedback conduit directly connected to the pump displacement control inlet;
a control valve assembly interposed between the outlet of the pump and both the inlet of the motor and the feedback conduit, the control valve assembly having a housing including a valve chamber with a valve disposed therein, a solenoid drivably connectable to the valve for selecting moving the valve within the valve chamber between an opened position and a closed position; and
a control circuit in communication with the control valve assembly for controlling the control valve assembly and hence fluid flow to both of the motor and the pump displacement control inlet.
2 Assignments
0 Petitions
Accused Products
Abstract
Electronic control for a hydraulic system to drive an auxiliary power source is provided, with an application as a system for controlling the operation of a hydraulically driven AC generator. The system includes a hydraulic pump, a hydraulic motor drivably connected to the generator, and a fluid circuit for circulating fluid from the pump to the motor and back. The feedback circuit contains a feedback conduit to feedback the motor. The system also includes a proportional servo control valve assembly for controlling the fluid conduits and a control circuit for controlling the control valve assembly to thereby control the flow of fluid to the motor. Sensors for measuring the operating parameters of the system and an operator interface module are both able to influence the operation of the system.
28 Citations
41 Claims
-
1. A hydraulic system for driving an auxiliary power source, located aboard a vehicle having a primary power source, at a substantially constant speed despite fluctuations in rotational speed of the primary power source, the system comprising:
-
a hydraulic pump drivably connectable to the primary power source, the pump having an inlet for receiving fluid, an outlet for discharging fluid under pressure, and a pump displacement control inlet for receiving fluid to control displacement of the pump; a hydraulic motor drivably connectable to an auxiliary power source, the motor having an inlet for receiving fluid under pressure and an outlet for discharging spent fluid; a fluid circuit including a supply conduit for conducting fluid discharged by the pump to the motor, a return conduit for returning fluid discharged by the motor to the pump, and a feedback conduit directly connected to the pump displacement control inlet; a control valve assembly interposed between the outlet of the pump and both the inlet of the motor and the feedback conduit, the control valve assembly having a housing including a valve chamber with a valve disposed therein, a solenoid drivably connectable to the valve for selecting moving the valve within the valve chamber between an opened position and a closed position; and a control circuit in communication with the control valve assembly for controlling the control valve assembly and hence fluid flow to both of the motor and the pump displacement control inlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. A method for operating a hydraulic system, the method comprising:
-
sensing temperature of hydraulic fluid in a fluid circuit; if the temperature of the fluid is below a safe operating temperature, then warming the fluid by circulating the fluid through portions of the fluid circuit while restricting the fluid from the fluid circuit to a hydraulic motor; and incrementally supplying fluid from the fluid circuit to the motor once the temperature of the fluid reaches the safe operating temperature in order to bring the motor up to a desired speed so that full power operation can commence; wherein incrementally supplying fluid from the fluid circuit to the motor includes incrementally closing a hydraulic proportional valve disposed within the fluid circuit such that fluid is gradually conducted from a motor supply conduit of the fluid circuit in fluid communication with the motor in order to gradually supply power to the motor. - View Dependent Claims (33)
-
-
34. A method for operating a hydraulic system, the method comprising:
-
sensing temperature of hydraulic fluid in a fluid circuit; if the temperature of the fluid is below a safe operating temperature, then warming the fluid by circulating the fluid through portions of the fluid circuit; apportioning fluid from the fluid circuit to a hydraulic motor once the temperature of the fluid reaches the safe operating temperature in order to bring the motor up to a desired speed so that full power operation can commence; and sensing output characteristics of the motor; wherein apportioning fluid from the fluid circuit to the motor includes comparing sensed motor output characteristics with predetermined output characteristics and selectively controlling a hydraulic proportional valve disposed in the fluid circuit to move incrementally such that fluid is proportionally restricted from the fluid circuit to the motor. - View Dependent Claims (35, 36, 37, 38, 39)
-
-
40. A method for controlling a hydraulic system driven by an engine onboard a vehicle for supplying stable AC power despite fluctuations in engine speed, the method comprising:
-
sensing pressure of fluid in a fluid circuit; sensing temperature of the fluid; commencing operation of an auxiliary power source if the pressure and temperature of the fluid are sufficient; ceasing operation of the auxiliary power source if at least one of the pressure and temperature of the fluid is deficient by fully opening a hydraulic proportional valve disposed in the fluid circuit to feedback all fluid flow from the fluid circuit to a hydraulic motor coupled to the auxiliary power source; warming the fluid by circulating the fluid through the fluid circuit while restricting the fluid to the motor, if the temperature of the fluid is below a safe operating temperature; supplying the fluid gradually from the fluid circuit to the motor once the temperature of the fluid reaches the safe operating temperature in order to gradually bring the motor up to a desired speed such that full operation can commence; sensing output characteristics of the motor; and apportioning fluid flow from the fluid circuit to the motor in order to maintain constant motor output characteristics. - View Dependent Claims (41)
-
Specification