Abstract: A control system for a shiftable multi-speed hydraulically operated transmission system. The transmission includes internal clutches which are selectively operated by the control system to effect shifting in neutral, reverse or forward speed ranges. The transmission system includes a manually operable multi-position speed range selector switch, sensing devices for ascertaining transmission input and output speeds, and other condition responsive switches. The control system includes logic circuits therein for receiving input signal information from the switches and sensing devices and for providing output signals to effect automatic shifting of the transmission to a selected speed range. The electronic controller provides operational safeguards, responds appropriately to system failures, and displays of relevant system information.

Abstract: A servo controlled multi-mode steering system for a wheeled land vehicle. Slave wheels respond to the angular position of a steered master wheel and a steering mode select switch to provide front wheel, coordinated or crab steering.

Abstract: A control system for a road grader adapted to maintain the working edge of the grader blade in a preset datum plane so as to establish a uniform graded condition of the surface worked by the blade, regardless of the inclination assumed by the motor grader or the relative angular position of the blade itself. The system includes grade sensor means mounted adjacent one end of the blade to follow a pre-selected grade datum, slope sensing means mounted in fixed relation with the blade for keeping the blade at a predetermined slope with rotation sensing means mounted on the blade supporting ring or circle to detect the relative angular position of the blade. The rotation sensing means provides a correction signal for maintaining the slope angle of the blade at a value which will keep the "cross slope" of the surface established at a predetermined value regardless of the rotary position of the blade relative to the direction of travel.