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
Patterned MR device with controlled shape anisotropy
Fuse part in semiconductor device and method for forming the same
Digital broadcast receiver and method for processing caption thereof
Bus controller for handling split transactions
Systems and methods for tracking power modulation
Method and device for accessing the documentation of an aircraft according to alarms generated therein
Placental tissue grafts
  Randomly Featured Patents
Ramp car
Safety tire and wheel assemblies
Radiation detection apparatus
Chromogenic substances and use thereof for the determination of carboxypeptidase activities
Thermally stable hot-melt adhesive composition containing polycarbonate-polydimethylsiloxane block copolymer
Cutting insert with a wear-resistant coating scheme exhibiting wear indication and method of making the same
Reconfigurable IEEE 1149.1 bus interface
Developing method using developing electric field having back-transfer, transfer and rest steps
Football apparatus
Light guide lens and light emitting diode package structure having the light guide lens