Resources Contact Us Home
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
Clock face
Automated dynamic differential data processing
Invisible fence battery charger
Second order correction circuit and method for bandgap voltage reference
Process and apparatus for producing composite material that includes carbon nanotubes
Sample holder and method for treating sample material
Pattern transfer apparatus and method for fabricating semiconductor device
  Randomly Featured Patents
Preparation of a coating composition comprising amorphous aluminum phosphate particles
Cauliflower floral meristem identity genes and methods of using same
Wavelength demultiplexer
Expandable sequence control system
Process for the preparation of the R,R (or S,S) configured glycopyrronium stereoisomer
Bow string release
Wood rack
Articular disc prosthesis and method for treating spondylolisthesis
Universal suture dispenser box