Resources Contact Us Home
Solenoid self-cleaning pressure valve for automatic vehicle transmission

Image Number 4 for United States Patent #5971889.

A system for controlling an automatic vehicle transmission, including a gear system and hydraulic clutches which hold a member of the gear system stationary to produce gear reduction or reverse, having an oil line which connects the clutches to an oil pressure source, a pressure control valve having a solenoid provided in the oil line which generates a regulated oil pressure to be supplied to the clutches in response to a current supplied to the solenoid, a switch valve provided in the oil line which switches the oil pressure to be supplied to the one of the clutches between the regulated oil pressure and a line pressure. In the system, it is discriminated whether the pressure control valve does not supply the regulated oil pressure to the clutches and if so, a dither current is supplied to the solenoid such that the valve repeatedly performs a vibrational motion to remove any grit therefrom, thereby removing grit without causing gear-shift shock or clutch vibration.

  Recently Added Patents
System and method for browsing tabbed-heterogeneous windows
Panel for decoration
Cabinet door with tread pattern
Managing delivery of application server content
Fabrication of high gradient insulators by stack compression
High voltage fast recovery trench diode
Apparatus and method for manufacturing microneedles
  Randomly Featured Patents
Variable ratio fluid-mechanical drive apparatus
Photodetector non-responsive to Cerenkov radiation
Hair relaxer compositions utilizing cation exchange compositions
Apparatus and method for producing inverse bubbles
Modified zirconia induction furnace
Depression sensor for an electronic ignition advance device for an internal combustion engine
Shaped articles from orientable polymers and polymer microbeads
Signal quality measurement
Technology for increasing bandwidth of semiconductor optical amplifiers/superluminescent diodes using non-identical multiple quantum wells
Boom for a vehicle including folding linkage between boom parts