Hydraulic Control Systems Automatic Automotive Controls Patents (Class 74/DIG1)
  • Patent number: 5988043
    Abstract: A modulator adjustment device (10) including a generally cylindrical body (36, 37) having cavities formed at opposite ends thereof and a dial wheel (32) extending radially outwardly and circumscribing the body, a rotatable coupling (48) disposed in the cavity at one end of the body for sealingly engaging the vacuum fitting (20) of a modulator or the like, and a tube fitting (38) rotatably disposed within the cavity (35) at the other end of the body and having a distal end to which a vacuum tube (12) may be coupled. Suitable means are provided along the axis of the body for drivably engaging the adjustment screw (22) of the modulator. In one embodiment, such means includes an appropriately configured opening (20) for receiving and mating with the drive screw (22), and in a second embodiment the means includes a spring loaded screwdriver device (84) for drivably engaging a slot or socket in the end of the adjustment screw.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: November 23, 1999
    Inventor: Robert Velasco
  • Patent number: 5448148
    Abstract: A method and apparatus for positioning a housing of an excavator housing. A motor receives pressurized fluid to cause rotation of the excavator housing. A motor position sensor determines the rotational position of the housing and responsively produces a housing position signal. A pressure sensor determines the fluid pressure supplied to the motor and responsively produces a pressure signal. A microprocessor produces a signal indicative of a desired rotational position of the housing. The microprocessor receives the position and pressure signals, and responsively controls fluid to the motor in order to rotate the housing to the desired position.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: September 5, 1995
    Assignee: Caterpillar Inc.
    Inventor: Lonnie J. Devier
  • Patent number: 4387783
    Abstract: A fuel-saving energy storage vehicle drive system which saves fuel, primarily under stop-and-go driving conditions, by collecting, storing and using energy normally lost in the braking or deceleration of the vehicle, by automatically controlled operation of the engine under certain conditions, and by automatically controlled use of the stored energy and engine respectively as alternative or supplemental prime movers for each other for driving the vehicle. Subsystems for preventing waste of deceleration energy and stored energy are provided, and compact transmission layout and packaging are provided which facilitate installation of the new system in existing vehicles.
    Type: Grant
    Filed: September 4, 1980
    Date of Patent: June 14, 1983
    Assignee: Advanced Energy Systems Inc.
    Inventor: Vincent E. Carman
  • Patent number: 4275617
    Abstract: Disclosed is a drive assembly (10) for an electrically powered vehicle (12). The assembly includes a transaxle (16) having a two-speed transmission (40) and a drive axle differential (46) disposed in a unitary housing assembly (38), an oil-cooled prime mover or electric motor (14) for driving the transmission input shaft (42), an adapter assembly (24) for supporting the prime mover on the transaxle housing assembly, and a hydraulic system (172) providing pressurized oil flow for cooling and lubricating the electric motor and transaxle and for operating a clutch (84) and a brake (86) in the transmission to shift between the two-speed ratios of the transmission. The adapter assembly allows the prime mover to be supported in several positions on the transaxle housing. The brake is spring-applied and locks the transmission in its low-speed ratio should the hydraulic system fail. The hydraulic system pump is driven by an electric motor (212) independent of the prime mover and transaxle.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: June 30, 1981
    Assignee: Eaton Corporation
    Inventor: Ilmars Kalns
  • Patent number: 4252148
    Abstract: A hydraulic control for an automatic transmission has a plurality of shift control valves for controlling the interchange of drive ratios within the transmission. The shift control valves each have a control chamber subjected to substantially constant pressure and a shift control chamber having an area proportional to the respective control chamber which is subjected to a variable control pressure. The variable control pressure is controlled at discrete levels by a single pulse width modulator (PWM) solenoid. The respective area ratios of the shift control chambers to the controlled chambers determines the distinct shift point of each shift valve.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: February 24, 1981
    Assignee: General Motors Corporation
    Inventors: David L. Fochtman, William J. Vukovich
  • Patent number: 4229998
    Abstract: An automatic speed ratio control system of integration servo mechanism type for a stepless transmission of an automotive vehicle. Speed ratio is controlled by a hydraulic pump motor of variable displacement type, which in turn is controlled by an actuator having a piston and a cylinder to which hydraulic oil is supplied.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: October 28, 1980
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Kiyofumi Mizuno, Hiroaki Maeda, Shigeo Takahashi, Masanori Sato, Satomi Suzuki
  • Patent number: 4225029
    Abstract: An automatic transmission for automobiles having a gear means, a clutch and a brake, the engagement and disengagement of the clutch and the brake being changed over four shifting speed stages, wherein one of the mutually engageable friction elements of the brake is mounted to a housing of the transmission so as to be rotatably shiftable with respect to the housing through a small angle so that forward or backward rotary shifting of the friction element mechanically operates a timing valve which controls supply or exhaust of oil pressure to or from the brake.
    Type: Grant
    Filed: August 25, 1977
    Date of Patent: September 30, 1980
    Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
    Inventor: Fumihiro Ushijima