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
Methods and system for providing drug pricing information from multiple pharmacy benefit managers (PBMs)
Creation and use of test cases for automated testing of media-based applications
Switching device and electronic apparatus using the same
Method and apparatus for reducing and controlling highway congestion to save on fuel costs
Stacked thin-film superlattice thermoelectric devices
Optical sensor and electronic apparatus
HYR1 as a target for active and passive immunization against Candida
  Randomly Featured Patents
Variable discharge pump with two pumping plungers and shared shuttle member
Oil gasifying burner with an oil atomizer
Inflatable life raft
Time-controlled explosion systems and processes for preparing the same
Output buffer type asynchronous transfer mode switch and detecting error boards thereof
Dynamic N-best algorithm to reduce recognition errors
Single or multiple dose container-closure assemblies
Firing pin locking system
Semiconductor device comprising windings constituting inductors
Webbing take-up amount limiting device of a retractor