Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Solenoid self-cleaning pressure valve for automatic vehicle transmission










Image Number 2 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
Case for electronic device
Storing a location within metadata of visual media
Nickel-cobalt-manganese multi-element lithium ion battery cathode material with dopants and its methods of preparation
Reflective mask blank and method of manufacturing a reflective mask
Solid-state imaging apparatus and imaging system
Method and apparatus for wireless communication in a mesh network with central control of communication relationships
Reverse mapping method and apparatus for form filling
  Randomly Featured Patents
High efficiency bicycle hub
International dielectric mirror and production process for such a mirror
Very ultra thin conductor layers for printed wiring boards
Process for producing 1,4-diaminoanthraquinone-2-sulfonic acid
Magnet for NMR analyzer and NMR analyzer using the same
Output circuit for power IC with high breakdown voltage
Vapor phase epitaxial growth method of zinc selenide and zinc selenide-sulphide by organometallic chemical vapor deposition
Method for assembling a venetian blind
Method of making superhard mechanical microstructures
Fault detection circuit and method for testing a multiple conductor cable having a shield