Sundstrand-sauer

Sauer Gmbh

James R Reed

Richard K Heiser

Royal R Hawkins

Thomas R Fulkerson

A hydraulically propelled vehicle has a vehicle body with a pair of forward wheels and a pair of rearward wheels. A single fluid displacement pump is operatively connected to each wheel. A fluid displacement motor is connected to each wheel. The pump is fluidly connected to each motor. A steering angle sensor is located adjacent each wheel to sense the angular position of each wheel. The speed sensor is on each motor to measure its rotational speed output. A fluid displacement actuator is on each motor to set the fluid displacement thereof. A fluid displacement computer controller is operatively connected by electronic impulse to the speed sensors. The fluid displacement actuators and the steering angle sensors are operatively connected to the controller so that the controller can obtain information therefrom to calculate the expected speeds for the motors. A circuit on the controller compares the actual speed of the motors with the calculated speed thereof so the controller can cause the fluid displacement to be reduced on any motor that exceeds the calculated speed.

Method and means for providing a steer-assist and anti-spin system for

A controller for controlling the slope of a screed supported by support arms wherein the screed is moved over a distance includes a first slope sensor which develops a first sensor signal representing the slope of the screed, a second slope sensor which develops a second sensor signal representing the slope of the support arms and a first summer which sums the first sensor signal and command signal indicative of a particular screed slope to develop a first error signal. An integrator integrates the error signal over distance to develop an integrated first error signal. A second summer sums the integrated first error signal with the second sensor signal to develop a second error signal which is utilized to control actuators which adjust the slope of the support arms.

Screed slope controller for a paver

Machines having a boom or arm pivotally disposed thereon wherein the length of the boom or arm and the angle thereof with respect to a reference plane are adjustable by means of actuators are well known. However, it is extremely difficult, if not impossible, to simultaneously control the actuators in a coordinated fashion to move the end of the boom or arm in a straight line path. In order to overcome this problem, a boom control system for a boom according to the present invention controls the actuators in either of two modes of operation, the first mode of operation comprising independent control over each actuator to afford polar coordinate operation and the second mode of operation comprising synchronized control over the actuators so that the end of the member may be moved in a straight line. Means are provided for manually selecting one of the two modes of operation. Means may be provided for calculating the amount of remaining horizontal throw of the boom or arm when a command to move same is issued.

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Minneapolis, MN, United States of America

James R Reed