Abstract:
A hydraulic system includes a hydraulic transmission including a hydraulic pump configured to be coupled to a prime mover, a hydraulic motor configured to be coupled to an output shaft, and fluid lines coupling the hydraulic pump to the hydraulic motor to provide a fluid circuit providing flow communication between the hydraulic pump and the hydraulic motor, such that operation of the hydraulic pump provides fluid flow to the hydraulic motor, and the hydraulic motor supplies torque to the output shaft. A controller is configured to control operation of the hydraulic transmission. The controller is configured to receive signals indicative of pressure in the fluid circuit and reduce an output of the hydraulic pump when the pressure in the fluid circuit reaches a pressure level, and a rate of response of the reduction of the output of the hydraulic pump is varied based on a temperature of fluid in the fluid circuit.
Abstract:
A hydraulic system includes a hydraulic transmission including a hydraulic pump configured to be coupled to a prime mover, a hydraulic motor configured to be coupled to an output shaft, and fluid lines coupling the hydraulic pump to the hydraulic motor to provide a fluid circuit providing flow communication between the hydraulic pump and the hydraulic motor, such that operation of the hydraulic pump provides fluid flow to the hydraulic motor, and the hydraulic motor supplies torque to the output shaft. A controller is configured to control operation of the hydraulic transmission. The controller is configured to receive signals indicative of pressure in the fluid circuit and reduce an output of the hydraulic pump when the pressure in the fluid circuit reaches a pressure level, and a rate of response of the reduction of the output of the hydraulic pump is varied based on a temperature of fluid in the fluid circuit.
Abstract:
A drive system for a machine is disclosed. The drive system may have an engine, a pump driven by the engine to pressurize fluid, a motor connected to the pump via an inlet passage and an outlet passage, and a traction device driven by the motor. The drive system may also have an operator input device movable from a neutral position through a range to a maximum displaced position to affect a speed of the engine, and a controller in communication with the input device and at least one of the pump and motor. The controller may be configured to gradually adjust a displacement of the at least one of the pump and motor to slow the traction device over a period of time after the operator input device is returned to the neutral position.
Abstract:
A method and system for retarding an engine of a machine is provided. The machine has a hydraulic pump driven by the engine, a motor driven by the hydraulic pump, and a fan driven by the motor. The method includes sensing the operating speed of the engine with an engine speed sensor. The method also includes operating the motor at a first pressure. The method also includes comparing the operating speed to a trigger speed. The method also includes operating the motor at a second pressure greater than the first pressure if the operating speed of engine exceeds the trigger speed by a predetermined value.
Abstract:
A method and apparatus for controlling a hydraulic power system that includes a hydraulic motor and a hydraulic pump configured to supply hydraulic fluid to the hydraulic motor is provided. A relief valve is provided that is configured to release hydraulic fluid from a location between the hydraulic pump and the hydraulic motor when a pressure of the hydraulic fluid exceeds a predetermined pressure. A controller is in communication with the hydraulic motor and the hydraulic pump. The controller is configured to determine a first hydraulic fluid flow across the relief valve and determine a desired maximum flow across the relief valve. The controller also can regulate one or both of the hydraulic pump and the hydraulic motor to control the first hydraulic fluid flow based on the desired maximum flow.
Abstract:
A manual control device for a machine includes a handle having a variable damper configured to alter a stiffness thereof in response to a control signal. A displacement sensor provides a displacement signal indicative of the displacement of the handle. A controller is associated with the variable damper, the manual control device, the displacement sensor, and the actuator. The controller determines a then present operating state of the actuator and a command provided to the actuator based on the displacement signal, and provides the control signal to stiffen the variable damper such that the displacement of the handle is limited to an additional displacement of the handle that corresponds to a difference between the then present operating state of the actuator and a maximum allowable operating state of the actuator.
Abstract:
A fluid delivery system includes a first pump having a first drive assembly, a second pump having a second drive assembly, and a pump housing. At least a portion of each of the first and second pumps are located in the housing.
Abstract:
An apparatus and method for pumping oil in a machine. The apparatus and method includes a first gear drivably connected to the machine, a second gear connected to the machine such that a set of teeth located on the first gear engage a set of teeth located on the second gear, an oil inlet port located near the teeth of the first gear slightly before a point of engagement of the teeth of the first and second gears, and an oil outlet port located at the point of engagement of the teeth of the first and second gears.
Abstract:
A method and system for retarding an engine of a machine is provided. The machine has a hydraulic pump driven by the engine, a motor driven by the hydraulic pump, and a fan driven by the motor. The method includes sensing the operating speed of the engine with an engine speed sensor. The method also includes operating the motor at a first pressure. The method also includes comparing the operating speed to a trigger speed. The method also includes operating the motor at a second pressure greater than the first pressure if the operating speed of engine exceeds the trigger speed by a predetermined value.
Abstract:
A drive system for a machine is disclosed. The drive system may have an engine, a pump driven by the engine to pressurize fluid, a motor connected to the pump via an inlet passage and an outlet passage, and a traction device driven by the motor. The drive system may also have an operator input device movable from a neutral position through a range to a maximum displaced position to affect a speed of the engine, and a controller in communication with the input device and at least one of the pump and motor. The controller may be configured to gradually adjust a displacement of the at least one of the pump and motor to slow the traction device over a period of time after the operator input device is returned to the neutral position.