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 multi-threaded MIMO OFDM channel equalizer
Antimicrobial flush solutions
Arcuate motion control in electrostatic actuators
Method for determining a corrected variance representative of the condition of reception of signals representative of symbols
Reframing circuitry with virtual container drop and insert functionality to support circuit emulation protocols
Mirror drift compensation in an optical circuit switch
  Randomly Featured Patents
Microfluid reaction carrier having three flow levels and a transparent protective layer
Apparatus and method for attaching vane to shaft
Apparatus for and method of contouring plates for bone fixation
Method and apparatus for recording and indexing an audio and multimedia conference
Portable reinflator
High voltage MOS transistor
Combination tank car valve skid and valve seat
Knitting machine
Uncalibrated dynamic mechanical system controller
Dispenser for rolls of sheet material