A box blade grading attachment of the present disclosure may comprise an attachment frame, a coupler bracket, a tilt connection, a pivot beam, left and right caster wheels, a grading box, and a tilting actuator. The attachment frame includes a rear attachment frame portion for coupling of the box blade grading attachment to a construction machine and an upper attachment frame portion having an upward facing reference surface. The tilt connection defines a tilt axis about which the attachment frame may tilt relative to the coupler bracket. The tilt axis may be substantially parallel to the upward facing reference surface. The pivot beam is pivotally connected to the upper attachment frame portion and includes left and right caster wheels pivotally connected to the pivot beam. The tilting actuator tilts the attachment frame and the grading box about the tilt axis relative to the coupler bracket.

A work vehicle includes a vehicle body, a blade supported on the vehicle body, a pair of first hydraulic cylinders for moving the blade upward and downward, a pair of second hydraulic cylinders for tilting the blade forward, backward, leftward, and rightward, a pair of stroke sensors for detecting stroke amounts of the pair of first hydraulic cylinders, and a controller for controlling a position of the blade based on a difference in the stroke amounts of the pair of first hydraulic cylinders when, in a state where one second hydraulic cylinder is at the one stroke end or the other stroke end, the other second hydraulic cylinder is driven from one stroke end to the other stroke end.

Systems and methods for using a two-dimensional (2D) grade control system wherein the 2D grade control system remains enabled both while a blade of a bladed work machine performs a grading operation as the work machine makes a pass along the ground, and remains enabled while the blade is raised as the work machine is repositioned for another pass. Moreover, once enabled, the 2D grade control system can remain enabled, and transition between an active mode, where the 2D grade control system automatically orients the blade, and an inactive mode, wherein the operator may have overridden the 2D grade control system. By remaining enabled during both the active and inactive modes, the operator need not take the extra actions of repeatedly re-enabling the 2D grade control system after each time that the operator may have overridden the 2D grade control system, thereby saving the time and effort of the operator.

Embodiments are directed to calibration of a blade and/or attachment member coupled to the body of a vehicle, such as a bulldozer. By analyzing attitude measurements of the blade and attachment member corresponding to directed movements of the vehicle, calibration parameters such as the offset angles of the blade (and attachment member) relative to the body can be determined. Other calibration variables, such as the maximum swing angles of the blade relative to the attachment member, can also be determined.

A mobile work machine includes a first grade control system that receives a an external reference position signal from a geographic positioning system, and generates blade control signals to control an orientation of a blade in grading a worksite. The mobile work machine also includes a second grade control system that uses blade mainfall and cross slope as well as chassis (or mainframe) mainfall and cross slope to control the orientation of the blade relative to the frame of the work machine to create a planar grade of a desired mainfall and cross slope. When functionality of the first grade control system is interrupted, the mobile work machine automatically switches to using the second grade control system to perform the grading operation, until the interruption to the functionality of the first grade control system is restored.

A method of controlling a grading attachment on a skid steer vehicle that includes the steps of lowering a main arm of a skid steer vehicle with either an electric non-hydraulic cylinder or a drive motor to the main arm's lowest allowed position along an arm translation path on the skid steer vehicle and adjusting, while the main arm is the in the lowest allowed position, either or both a pitch axis movement and/or a yaw axis movement of a grading attachment coupled to the main arm autonomously using an automatic grade control system implementing at least one of a laser, a GPS, an LPS, and an ultrasonic sensor and with at least one a plurality of electric non-hydraulic cylinders and drive motors, wherein the automatic grade control system is communicatively coupled to the at least one a plurality of electric non-hydraulic cylinders and drive motors.

A method for steering a mobile machine includes automatically steering the mobile machine in a track steering mode, determining a load condition of the mobile machine, and automatically steering the mobile machine in the track steering mode and a blade steering mode, simultaneously, based on the load condition of the mobile machine.

This construction machine includes a blade and a manipulating lever. The blade is provided to a machine body. The blade is configured such that a plurality of operations are possible. The manipulating lever manipulates the blade. The manipulating lever is configured so as to be able to control each of the plurality of operations by a different manipulation. The manipulating lever is preferably configured so as to be able to manipulate each of the plurality of operations in the same direction.