A fluid pumping system for an automatic transmission includes a primary pump operable to draw fluid from a sump to a main delivery line to a main hydraulic circuit of the transmission. A main circuit pressure regulator regulates pressure to the main circuit and exhausts excess fluid to a secondary delivery line to a secondary hydraulic circuit of the transmission. A secondary pump operates to draw fluid from the suction line to a discharge line. A check ball valve operates to permit one way flow from the discharge line to the secondary delivery line. A secondary circuit pressure regulator regulates pressure to the secondary circuit and operates to exhaust flow from the discharge line to a return line or from the discharge line and the secondary delivery line wherein the return line is in continuous fluid communication with the suction line to reduce hydraulic horsepower expended by the secondary pump.
Engine Engagement Control For A Hybrid Electric Vehicle
Rongjun Zhang - Santa Rosa CA, US Mark Leonard Hopper - Ypsilanti MI, US Stephen De La Salle - Danbury Essex, GB
Assignee:
Visteon Global Technologies, Inc. - Dearborn MI
International Classification:
G06F 700
US Classification:
701 22, 701 70, 477 67, 180 652, 290 40 A, 290 40 B, 290 40 C
Abstract:
A control system is disclosed for minimizing the driveline vibrations in a hybrid electric vehicle during engine engagement. The control system involves determining the speed of the electric motor and taking the derivative of the speed to determine the acceleration. A signal representing the acceleration is created. The acceleration signal is filtered. The filtered acceleration signal is used to calculate a feedback control term through a controller. The controller can be either a PD controller or a PID controller with a low integral gain. The feedback control term is used to adjust the output torque of the electric motor to suppress the vibrations caused by engine engagement.
Visteon Global Technologies, Inc. - Van Buren Township MI
International Classification:
B60K041/04
US Classification:
477110, 477111
Abstract:
A method of controlling an engine and an automatic transmission of a vehicle to reduce noise, vibration and harshness issues during shutting off a vehicle engine to improve fuel economy. The method combines vehicle engine start/stop control with neutral idle control in the transmission.
A lever electromechanical valve actuator assembly and arrangement of electromechanical valve actuators that creates a compact actuator assembly to increase ease of serviceability, provide space for engine components and eliminate interference between the actuators and components in the vehicle engine compartment.
Ha T. Chung - Canton MI, US Mark L. Hopper - Ypsilanti MI, US John D. Norton - Ann Arbor MI, US Shawn H. Swales - Canton MI, US
Assignee:
Visteon Global Technologies, Inc. - Van Buren Township MI
International Classification:
F01L 9/04
US Classification:
123 9011, 123 9024, 25112901, 25112915
Abstract:
A lever electromechanical valve actuator assembly and arrangement of electromechanical valve actuators that creates a compact actuator assembly to increase ease of serviceability, provide space for engine components and eliminate interference between the actuators and components in the vehicle engine compartment.
Dither Amplitude Correction For Constant Current Drivers
Dirk E. Swanson - Canton MI, US Matthew T. LaDuke - Warren MI, US Mark L. Hopper - Ypsilanti MI, US Robert J. Bolduc - Allen Park MI, US
Assignee:
Visteon Global Technologies, Inc. - Van Buren Township MI
International Classification:
H03K 17/687
US Classification:
327427, 327434, 327307, 327 73
Abstract:
In satisfying the above need, as well as overcoming the enumerated drawbacks and other limitations of the related art, the present invention provides an improved switched driver circuit. As disclosed above, there is a need to compensate for the high impedance load characteristics in certain implementations of hysteretic switching constant current drivers. The switching waveform of switching constant current driver circuits may be modified in such a way that retains the important dither characteristics and improves system level performance.
Electromechanical Valve Actuator Beginning Of Stroke Damper
Mark L. Hopper - Ypsilanti MI, US Shawn H. Swales - Canton MI, US
Assignee:
Visteon Global Technologies, Inc. - Van Buren Township MI
International Classification:
F01L 9/02
US Classification:
123 9011, 123 9012, 25112915
Abstract:
An electromechanical valve actuator having a beginning of stroke damper to damp the impact between the armature stem and the valve stem as the valve is opened. The beginning of stroke damper includes an armature stem defining a stem passage and a valve stem including a lash compensator defining a cavity communicating with the stem passage. An oil pocket may be provided within the cavity to absorb the impact of the armature stem before the armature stem contacts the valve stem as the valve is opened. The lash compensator is configured so that the cavity has a discharge rate sufficient to ensure that the cavity completely drains at approximately the time the engine valve reaches the full open position.
Ha T. Chung - Canton MI, US Mark L. Hopper - West Chester OH, US John D. Norton - Candler NC, US Shawn H. Swales - Canton MI, US
Assignee:
Visteon Global Technologies, Inc. - Van Buren Township MI
International Classification:
F01L 9/04
US Classification:
123 9011, 25112901, 25112916
Abstract:
An electromechanical valve actuator with an armature stem guidance system that ensures that the armature stem stays aligned with the valve stem during operation. The stem guidance system may also allow for adjustment of the lash gap during assembly.
DeLoof, Hopper, Dever & Wright, PLLC 301 N. Main Street, Suite 250, Ann Arbor, MI 48104
Phone:
7342744577 (Phone)
Specialties:
Business Litigation Commercial Litigation Arbitration Contracts Business Torts Noncompetition and Non-Solicitation Agreements Trade Secrets Business Dissolution Real Estate Litigation ERISA Litigation
ISLN:
906380435
Admitted:
1978, Michigan U.S. District Court, Eastern District of Michigan U.S. Court of Appeals, Sixth Circuit 1985, U.S. Supreme Court