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
Web-based royalty system and user interface
Low cost mesh network capability
Chemically bonded carbon nanotube-polymer hybrid and nanocomposite thereof
Method and system for encrypting data in a wireless communication system
Pattern identification apparatus, control method and program thereof
Multi-function wrench for a power tool
Audio signal clip detection
  Randomly Featured Patents
Mounting apparatus for fans
Harmony generating circuit for a musical instrument
Magnifying device
Multiple laser having a distributed resonator
Power-off apparatus, systems, and methods
Tray for conveying medical vials
Masonry cement composition and method of making
Oscillator coupled through cylindrical cavity for generating low noise microwaves
Test tube for biological analyses, provided with a device for checking efficiency and position, for photometric readings
Method of manufacturing a single crystal and apparatus for manufacturing single crystal