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
Method and system for phase-sensitive magnetic resonance imaging
Perspective runway system
Electronic device, display, image processing apparatus and electronic calculating apparatus
Proximity sensor arrangement in a mobile device
Methods and systems providing desktop search capability to software application
Defect inspection method and device therefor
  Randomly Featured Patents
Toy oven
Introducing liquid for ink jet head, ink jet head, and ink jet recording apparatus
Three-dimensional strategy game
Recording method, recording device, and recording medium
Continuous system health indicator for managing computer system alerts
Fishing lure with contrasting features
Anchor for an artificial ligament
Adhesive block ethylenic copolymers, cosmetic compositions containing them and cosmetic use of these copolymers
Method and apparatus for accessing stored data in a reconfigurable IC
Process for preparing hollow fibre sections for hollow fibre modules and said hollow fibre section for a hollow fibre module