Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Shared system to operationally connect logic nodes
Network-based dynamic encoding
Produce container and lid assembly
Integrated emergency medical database system
System for programming domestic appliances and method for programming assembly-line programmable domestic appliances
Load control device
Image forming apparatus and warming up method thereof
  Randomly Featured Patents
Method of manufacturing a multilayered circuit board
Pulper comprising a screening sheet
Package, palletized load, and method of forming the same
System and computer program product to issue a retail prepaid card including a user-designed external face using a chit and related computer implemented methods
Eyelash extensions and method for applying eyelash extensions
Spout
Ink composition, ink composition for inkjet recording, ink set, ink cartridge, inkjet recording method, and recorded product
Device for recording data in a disturbed environment
Integrated articulating thermal isolation system and method
Titration/compliance pack with increasing doses