A hydraulic braking system having an electronically controlled full power brake valve is disclosed. The hydraulic braking system supplies a braking output for a vehicle having at least one brake. The hydraulic braking system includes a primary valve assembly that is configured to receive a manually controlled input that varies the braking output of the braking system. The primary valve assembly includes a first spool valve configured to vary the braking output according to the manually controlled input. The hydraulic braking system also includes a secondary valve assembly integral with the primary valve assembly. The secondary valve assembly is configured to receive input signals from a programmable electronic controller and includes a second spool valve configured to operate with the primary valve assembly. The secondary valve assembly also includes an actuator for engaging and actuating the second spool valve according to the input signals received from the programmable electronic controller such that the second spool valve modulates the braking output produced by the primary valve assembly.
David Ewel - Mankato MN, US Craig Lapoint - North Mankato MN, US
An electronic pedal assembly including a pedal and a base. The pedal is pivotally mounted to the base by a mounting arrangement. The assembly includes a spring arrangement. The spring arrangement is retained by a number of spring retaining constructions, including arms formed on the pedal and a retaining pin. The pedal rotates relative to the base. Rotation is at least partially limited by a tab form on a bearing structure of the pedal. The base of the electronic pedal assembly includes an integral sensor housing configured to receive a sensor. Assembly is accomplished by inserting the bearing structure of the pedal within a receiving hub formed in the sensor housing of the base.
Hydrostatic Power Steering System Having Reduced Wheel Slip
David W. Thomas - Plymouth MN David E. Ewel - Eden Prairie MN Timothy A. Hjelsand - Waconia MN Jerry F. Carlin - Mound MN Russell P. Schuchmann - Milwaukee WI
Eaton Corporation - Cleveland OH
F15B 903 F16D 3102
A hydrostatic power steering system comprising a fluid motor (19) which receives pressurized fluid from a controller (17) in response to the rotation of a vehicle steering wheel (W). As the motor (19) or the steered wheels reach the stops, control logic (31) receives signals (37,77) representing steered wheel and steering wheel position, respectively, and generates appropriate command signals (33,27) to a pressure reducing/relieving valve (15) and to a proportional electromagnetic valve (23), respectively, closing the valve (15) somewhat, and opening the valve (23). A pressure differential is built between an additional fluid path (21) and the high pressure conduit (15c) between the controller (17) and the fluid motor (19). Pressure is communicated through the valve (23) into the conduit (51c), and back into the fluid meter (43) of the controller, preventing any further rotation thereof in response to an attempt to turn the steering wheel, thus eliminating travel limit slip.
South Central College Jan 2010 - Dec 2014
Dewel Jan 2010 - Dec 2014
Mico Inc May 1998 - Dec 2009
Director of Engineering
Eaton May 1995 - Apr 1998
Chief Engineer Valves and Electronics
Moog Inc. Jun 1978 - May 1995
Various Engineering and Management Positions
University at Buffalo School of Management, the State University of New York 1989 - 1992
Master of Business Administration, Masters, Business Finance
University at Buffalo 1974 - 1978
Bachelors, Bachelor of Science, Engineering
Pioneer High School
University at Buffalo
Master of Business Administration, Masters, Bachelor of Science In Mechanical Engineering, Bachelors
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