Abstract: A machine includes a front section having front wheels, a rear section having rear wheels, and a pivot that couples the front section to the rear section as well as a hydraulic steering circuit that moves the front section relative to the rear section about the pivot. The machine also includes a stabilizer and further includes a directional control valve that selectively depressurizes the hydraulic steering circuit according to a state of the stabilizer.

Abstract: A machine includes a front section having front wheels, a rear section having rear wheels, and a pivot that couples the front section to the rear section as well as a hydraulic steering circuit that moves the front section relative to the rear section about the pivot. The machine also includes a stabilizer and further includes a directional control valve that selectively depressurizes the hydraulic steering circuit according to a state of the stabilizer.

Abstract: A method and apparatus for controlling discharge pressure and pump displacement of a plurality of variable displacement hydraulic pumps having connected discharge ports is provided. Each pump includes a swashplate and a control valve for controlling an angle of inclination of the swashplate. A desired first pump displacement control law is determined for a first pump and determined a desired second pump discharge pressure control law for a second pump. The first control law is used to determine a first intermediate control variable. The second control law is used to determine a second intermediate control variable. The control of the first and second pumps are combined using the first and second intermediate control variables. A desired first control valve setting for the control valve of the first pump is determined using the combined first and second intermediate control variables and the first control law.

Abstract: Methods, apparatuses, and computer program products for controlling the torque load of multiple variable displacement hydraulic pumps are described herein. A pump displacement limit for each variable displacement hydraulic pump is determined using a nonlinear control law to limit the total pump torque load of the variable displacement hydraulic pumps on the engine. The value of the actual pump displacement of each variable displacement hydraulic pump is controlled based upon the respective determined pump displacement limit.

Abstract: A method and apparatus for controlling discharge pressure and pump displacement of a plurality of variable displacement hydraulic pumps having connected discharge ports is provided. Each pump includes a swashplate and a control valve for controlling an angle of inclination of the swashplate. A desired first pump displacement control law is determined for a first pump and determined a desired second pump discharge pressure control law for a second pump. The first control law is used to determine a first intermediate control variable. The second control law is used to determine a second intermediate control variable. The control of the first and second pumps are combined using the first and second intermediate control variables. A desired first control valve setting for the control valve of the first pump is determined using the combined first and second intermediate control variables and the first control law.

Abstract: Methods, apparatuses, and computer program products for controlling the torque load of multiple variable displacement hydraulic pumps are described herein. A pump displacement limit for each variable displacement hydraulic pump is determined using a nonlinear control law to limit the total pump torque load of the variable displacement hydraulic pumps on the engine. The value of the actual pump displacement of each variable displacement hydraulic pump is controlled based upon the respective determined pump displacement limit.

Abstract: The portable brake of the present invention comprises a top bracket, a bottom bracket, a leg, a handle, a toggle plate, and a foot. The top bracket of the portable brake has a back plate, side plates, a bottom plate, a toggle joint, a rung hook, and a leg sheath. The bottom bracket comprises a back plate, side plates, a bottom plate, a rung hook, and a leg sheath. The top and bottom brackets secure a leg, which passes through the leg sheaths of the brackets and leg apertures in the bottom plates of the brackets. A toggle plate is connected at one end to the top of the leg, and is connected at the other end to a pair of hinge plates. The hinge plates are, in turn, connected to a handle and to the toggle joint of the top bracket.

Abstract: The portable brake of the present invention comprises a top bracket, a bottom bracket, a leg, a handle, a toggle plate, and a foot. The top bracket of the portable brake has a back plate, side plates, a bottom plate, a toggle joint, a rung hook, and a leg sheath. The bottom bracket comprises a back plate, side plates, a bottom plate, a rung hook, and a leg sheath. The top and bottom brackets secure a leg, which passes through the leg sheaths of the brackets and leg apertures in the bottom plates of the brackets. A toggle plate is connected at one end to the top of the leg, and is connected at the other end to a pair of hinge plates. The hinge plates are, in turn, connected to a handle and to the toggle joint of the top bracket.