Patents by Inventor Wade Gehlhoff
Wade Gehlhoff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20160146165Abstract: An air intake arrangement for an air intake system for an engine includes a first pre-cleaner arrangement having a housing with an air flow inlet to receive air to be pre-cleaned. A pre-cleaner region is constructed and arranged to remove at least some particulate from the inlet air. The first pre-cleaner arrangement further includes a vacuum flow path and a drop tube flow path. The vacuum flow path is in air flow communication with a first vacuum source to selectively put a vacuum draw through the pre-cleaner region. The drop tube flow path is in air flow communication with a drop tube to eject particulate removed from the inlet air by the pre-cleaner region.Type: ApplicationFiled: June 27, 2014Publication date: May 26, 2016Inventors: Wade GEHLHOFF, Steven GIESEKE, Wenliang ZHOU, Michael LI, Gao Aaron HUA
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Patent number: 9037272Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.Type: GrantFiled: July 11, 2013Date of Patent: May 19, 2015Assignee: Eaton CorporationInventors: QingHui Yuan, Christy Schottler, Wade Gehlhoff, Hong Singhania
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Publication number: 20130297045Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.Type: ApplicationFiled: July 11, 2013Publication date: November 7, 2013Inventors: QingHui Yuan, Christy Schottler, Wade Gehlhoff, Hong Singhania
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Patent number: 8527073Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.Type: GrantFiled: August 6, 2012Date of Patent: September 3, 2013Assignee: Eaton CorporationInventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
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Publication number: 20120303141Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.Type: ApplicationFiled: August 6, 2012Publication date: November 29, 2012Applicant: Eaton CorporationInventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
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Patent number: 8239069Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.Type: GrantFiled: June 11, 2009Date of Patent: August 7, 2012Assignee: Eaton CorporationInventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
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Publication number: 20090312852Abstract: A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.Type: ApplicationFiled: June 11, 2009Publication date: December 17, 2009Inventors: QingHui Yuan, Chris Schottler, Wade Gehlhoff, Hong Singhania
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Publication number: 20070227599Abstract: A fluid controller (15a) in a multiple-input hydrostatic power steering system includes a check valve assembly (101), having a first fluid passage (111), defining a check valve seat (105) and a check valve (103) operably associated therewith, in fluid communication with a second fluid passage (109), with the second fluid passage (109) being in fluid communication with a return port (25a). In the left (L) and right (R) operating positions, return flow can flow from the interior region (114) of the valve (27), through the first fluid passage (111), past the check valve (103), and through the second fluid passage (109) to the return port (25a). In the neutral position (N), pressurized fluid can flow from an inlet port (19a) to the return port (25a), with the check valve (103) preventing fluid from flowing through the first fluid passage (111) and into the interior region (114) of the valve (27).Type: ApplicationFiled: March 31, 2006Publication date: October 4, 2007Inventor: Wade Gehlhoff
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Publication number: 20070079881Abstract: A fluid controller (17) controls a main fluid path (18) from a pump (11) to a primary steering cylinder (19) and a second fluid path (26) from a fluid meter (37) to a second cylinder (31). A mechanical or electrical linkage (149) couples the primary steering cylinder (19) to the second cylinder (31) such that displacement of the primary cylinder (19) results in proportional corresponding displacement of the second cylinder (31). The main fluid path (18) and the second fluid path (26) are maintained separate from each other. As such, the main fluid path (18) provides pressurized fluid from the pump to the primary steering cylinder (19) without communicating main fluid flow to the secondary cylinder (31). Due to the separate fluid paths, the present invention can be used to provide a substantial amount of fluid through a fluid controller (17) with a relatively small displacement fluid meter (37).Type: ApplicationFiled: October 7, 2005Publication date: April 12, 2007Inventor: Wade Gehlhoff
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Publication number: 20060248883Abstract: A hydraulic control system including a source (11) of fluid having a pressure responsive means (15) and an actuator. A main control valve (21) has ports (27, 29) communicating with the actuator ports by means of first (41) and second (43) conduits, and means to generate a load pressure (45). A pressure spike suppression valve (51) has ports connected across the conduits, the valve including a spool (65) moveable between a first position blocking communication between the ports, and a second position permitting communication. The valve (51) defines a spring chamber (67) including a spring (69) biasing the spool toward the first position. The valve defines a load signal passage (83) to communicate the load pressure to a chamber also to bias the spool toward the first position. The valve defines a pressure chamber (81) in communication with the source, fluid pressure therein biasing the spool toward the second position.Type: ApplicationFiled: May 9, 2005Publication date: November 9, 2006Inventor: Wade Gehlhoff