Abstract: Described herein are systems, methods, and other techniques for performing an alignment operation concurrently with a retraction operation at a construction machine. A guidance line is set for guiding an implement of the construction machine. An input signal is received via a user input device for moving the construction machine to reduce an extension distance between the implement and the machine's platform. A first control signal is generated to cause a movement of the construction machine to reduce the extension distance. During the movement of the construction machine, a second control signal is generated to cause the machine's boom to horizontally rotate with respect to the platform such that the implement moves along and remains aligned with the guidance line.

Abstract: A method and apparatus for controlling a hydraulic power system is provided that includes a hydraulic motor and a hydraulic pump configured to supply hydraulic fluid to the hydraulic motor. 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 relief pressure. Above a predetermined threshold pressure for the system, the displacement of the pump is adjusted to at least a minimum displacement that is based on a total demanded flow for the system that includes a desired flow of hydraulic fluid across the relief valve and a first hydraulic fluid flow consumed by the motor.

Abstract: A system for driving a machine is provided. A user input device inputs a desired throttle setting for the machine. The system includes an infinitely variable transmission having a transmission ratio that is adjustable. At least one sensor determines an inclination of the machine relative to a reference plane. A controller is configured to determine and apply a variable rate limit upon change in the transmission ratio based on the inclination of the machine when the desired throttle setting is reduced more than a predetermined amount and to adjust the rate limit based on the difference between an actual engine speed and a desired engine speed.

Abstract: A system for driving a machine is provided. A user input device inputs a desired throttle setting for the machine. The system includes an infinitely variable transmission having a transmission ratio that is adjustable. At least one sensor determines an inclination of the machine relative to a reference plane. A controller is configured to determine and apply a variable rate limit upon change in the transmission ratio based on the inclination of the machine when the desired throttle setting is reduced more than a predetermined amount and to adjust the rate limit based on the difference between an actual engine speed and a desired engine speed.

Abstract: A system and method for controlling fluid flow through a hydraulic valve in a work machine is disclosed. The system and method may include receiving an input command by a controller configured to control a fluid flow to an actuator, the input command generated by an input controller. The system and method may also include receiving a parameter indicative of pump flow by the controller, determining a first valve command corresponding to the input command and determining a second valve command based upon the parameter that achieves the fluid flow to the actuator corresponding to the first valve command.

Abstract: A system for automated control of movement of a machine includes a pitch rate sensor to indicate the pitch rate of the machine. The machine has an implement movable relative to the machine. A controller generates a command signal to move the implement to control the pitch rate of the machine. A method is also provided.

Abstract: A system for automated control of a ground-engaging traction device includes sensors to indicate a speed of the ground-engaging traction device, an acceleration of the machine, and a pitch rate of the machine. A controller determines a drive acceleration based upon the speed, and a ground acceleration based upon the acceleration and the pitch rate. The controller determines a command signal at least in part based upon an operator input command signal and a difference between the drive acceleration and the ground acceleration. A method is also provided.

Abstract: A method and apparatus for controlling a hydraulic power system is provided that includes a hydraulic motor and a hydraulic pump configured to supply hydraulic fluid to the hydraulic motor. 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 relief pressure. Above a predetermined threshold pressure for the system, the displacement of the pump is adjusted to at least a minimum displacement that is based on a total demanded flow for the system that includes a desired flow of hydraulic fluid across the relief valve and a first hydraulic fluid flow consumed by the motor.

Abstract: A system for automated control of a ground-engaging traction device includes sensors to indicate a speed of the ground-engaging traction device, an acceleration of the machine, and a pitch rate of the machine. A controller determines a drive acceleration based upon the speed, and a ground acceleration based upon the acceleration and the pitch rate. The controller determines a command signal at least in part based upon an operator input command signal and a difference between the drive acceleration and the ground acceleration. A method is also provided.

Abstract: A system for automated movement of a ground engaging blade of a machine includes an acceleration sensor and a roll rate sensor on the blade to indicate a cross slope angular position of the blade. A controller stores a target cross slope and compares the target cross slope to the cross slope angular position. Movement of the ground engaging blade is at least in part based upon a difference between the target cross slope and the cross slope angular position to maintain the ground engaging blade at the target cross slope.

Abstract: A system for automated movement of a ground engaging blade of a machine includes a sensor on the blade to indicate a measured roll rate of the ground engaging blade. A controller determines whether the operator roll rate command is within an expected range of the roll rate signal. Movement of the ground engaging blade is at least in part based upon the operator roll rate command.