Patents by Inventor William P. Umlauf

William P. Umlauf has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5206805
    Abstract: The system provides an improved clutch control system for use in a continuously variable transmission system. The system provides for generation of a clutch pressure setpoint to re-engage the clutch during special conditions in which the torque created by the vehicle inertia would tend to drive the engine to an undesirable operating point. Clutch slip speed is monitored as a difference value and integrated to provide a gradually decreasing error signal to return the clutch input speed to the clutch output speed, at which time clutch lockup will occur. Additionally, throttle position is monitored and a maximum torque schedule used to provide a maximum torque signal to prevent driver demand from undesirably racing the engine in similar conditions. A filtered output of the maximum torque schedule provides a pressure setpoint signal representative of actual driver demand which may be added to the clutch slip speed error signal to generate the clutch pressure setpoint.
    Type: Grant
    Filed: July 6, 1989
    Date of Patent: April 27, 1993
    Assignee: Borg-Warner Automotive, Inc.
    Inventors: Werner P. Petzold, William P. Umlauf
  • Patent number: 5189611
    Abstract: Temperature compensation techniques are utilized to provide consistent system response in a continuously variable transmission system or other control system over a range of expected operating temperatures. Variations in the independent transfer functions for various control functions, such as ratio control, line pressure control and clutch control are monitored or measured. Appropriate modifications to system operating parameters are scheduled based upon the measured, simulated or predicted variations in the transfer functions as previously determined. In operation, the disclosed system senses temperature and provides the appropriate compensation and gain parameter modifications in accordance with the selected schedules.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: February 23, 1993
    Assignee: Borg-Warner Automotive, Inc.
    Inventors: Werner P. Petzold, William P. Umlauf
  • Patent number: 5106053
    Abstract: A solenoid operated hydraulic control valve system including a solenoid operated valve having a specially ported spool valve to statically balance spool forces in the opened and closed positions.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: April 21, 1992
    Assignee: Borg-Warner Automotive Electronic & Mechanical Systems Corporation
    Inventors: Alan L. Miller, George H. Studtmann, Todd L. King, Kenneth R. Gallaher, Jerome J. Zawada, William P. Umlauf
  • Patent number: 5062050
    Abstract: A line pressure control system for a continuously variable transmission which includes a continuously variable member, a clutch and a pressure transducer for providing a feedback signal for both closed loop line pressure and closed loop clutch control. The line pressure control system includes a closed loop control strategy and an open loop control strategy which operate independently, and initial conditions are determined and set to prevent discontinuities in the output. The closed loop control strategy includes proportional and integral gain terms. The control system is adaptable to utilize of a variety of different open loop control strategies to provide a schedule response to a desired line pressure or a maximum or minimum line pressure when appropriate. The control system also optionally provides for a transition from closed loop control to open loop control and vice versa in response to the output parameters generated.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: October 29, 1991
    Assignee: Borg-Warner Automotive, Inc.
    Inventors: Werner P. Petzold, William P. Umlauf
  • Patent number: 4988967
    Abstract: A solenoid operated hydraulic control valve which has a specially ported spool valve to statically balance spool force in the opened and closed positions, and a specially designed solenoid operator which includes very small ratios of gaps to cross-sectional areas for the working and non-working gaps between the armature and stator.
    Type: Grant
    Filed: October 14, 1988
    Date of Patent: January 29, 1991
    Assignee: Borg-Warner Automotive Electronic & Mechanical Systems Corporation
    Inventors: Alan L. Miller, George H. Studtmann, Todd L. King, Kenneth R. Gallaher, Jerome J. Zawada, William P. Umlauf
  • Patent number: 4982822
    Abstract: A pressure transducer, which senses clutch pressure and effects closed loop clutch control in a continuously variable transmission, is used after the clutch is fully engaged to provide closed loop line pressure control to a desired setpoint, which line pressure regulates the tension on the belt in the transmission. Only a single transducer is needed since there is a known relationship between the clutch and line pressures when the clutch is locked up. Prior to lockup, the line pressure is governed by an open loop controller which establishes the line pressure at a level higher than that called for by the setpoint. This ensures that the line pressure will be high enough to provide the required tension on the belt so that it will not slip. After the clutch is engaged, the closed loop line pressure controller (which includes both the open loop line pressure controller and the closed loop clutch controller) establishes the line pressure at the setpoint.
    Type: Grant
    Filed: December 1, 1986
    Date of Patent: January 8, 1991
    Assignee: Borg-Warner Corporation
    Inventors: Werner P. Petzold, William P. Umlauf
  • Patent number: 4947970
    Abstract: A control system for a vehicle drive train includes a controller which is responsive to a throttle signal from a throttle position sensor and which controls a clutch unit to control speed and acceleration and to obtain optimum driver "feel". The system is responsive to advancing movement of a throttle to a more open position to efficiently utilize rotating energy of engine parts for more rapid vehicle acceleration.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: August 14, 1990
    Assignee: Borg-Warner Automotive, Inc.
    Inventors: Alan L. Miller, Susan W. Schultz, William P. Umlauf
  • Patent number: 4811225
    Abstract: A ratio control system for use in a continuously variable transmission is disclosed in conjunction with an improved technique for operation thereof. Individual gain schedules provide proportional gain in response to a selected one of a number of modes dependent upon clutch input speed, transmission belt ratio, or engine set point. Engine speed set point is determined as a function of a set point schedule in conjunction with a limiter and a filter to provide a gradual response to rapid changes in a throttle input or driver demand signal and vehicle speed. The error signal generated as an output of any of the proportional gain loops is integrated and combined with a null signal to provide a signal to generate a duty cycle for a pulse width modulation controlled electrohydraulic control valve to control the pressure to the primary sheave in a continuously variable transmission system for modifying the belt ratio.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: March 7, 1989
    Assignee: Borg-Warner Automotive, Inc.
    Inventors: Werner P. Petzold, William P. Umlauf
  • Patent number: 4793454
    Abstract: A clutch control system provides and regulates pressure at a clutch for transmitting torque from an engine to a drive train through a continuously variable transmission. A positive torque value is determined for each throttle setting and provided as a pressure input signal. Engine speed is monitored through a closed loop feedback system to provide an error signal to the desired pressure setting. A pressure control loop monitors pressure at the clutch through a closed loop feedback system to maintain the pressure at the clutch at a desired level. Filtering is provided in the torque and engine speed loops to provide for a more realistic response to driver demand. Incorporation of belt ratio factor in the engine speed control loop further provides for consistent and accurate response to driver demand variations at differing transmission drive levels. Overall line pressure within the associated hydraulic system further controls a proportional gain in the pressure control loop to provide appropriate response.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: December 27, 1988
    Assignee: Borg-Warner Automotive, Inc.
    Inventors: Werner P. Petzold, Alan L. Miller, William P. Umlauf