Gm Global Technolgoy Operations, Inc.

Matthew R Knoth

Eric S Tryon

William S Reed

Vijay A Neelakantan

Philip C Lundberg

Lawrence A Kaminsky

Michael D Foster

Joshua J McDonough

Scott T Weisgerber

A hydraulic control system for a multiple mode electro-mechanical drive unit of a motor vehicle includes multiple torque transmitting mechanisms each including at least one friction clutch. Multiple clutch control valves are individually in fluid communication with one of the torque transmitting mechanisms and are operable when actuated to change a condition of the torque transmitting mechanisms from a clutch disconnected condition to a clutch engaged condition. Solenoid valves are individually paired with and in fluid communication with one of the clutch control valves. A normally open variable force solenoid valve is in fluid communication with the solenoid valves. Operation of the variable force solenoid valve sets a hydraulic pressure between any of the solenoid valves in an open condition and its paired clutch control valve.

Hydraulic control system for a multiple mode electro-mechanical drive unit of an automatic transmission

A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid, a park servo connected to a park mechanism, the park servo having a park side, an out-of-park side, and a biasing member disposed on the park side. A first valve assembly includes a first inlet port in fluid communication with the source of pressurized hydraulic fluid, a first outlet port, and a first valve for selectively allowing fluid communication between the first inlet port and the first outlet port. A second valve assembly includes a second inlet port in direct fluid communication downstream of the first valve assembly, a second outlet port in direct fluid communication with the out-of-park side of the park servo, and a second valve moveable between an out-of-park position and a park position.

Electronic transmission range selection subsystem in a hydraulic control system for an automatic transmission

A vehicle includes a transmission, an electrically-driven fluid pump which supplies pressure to a hydraulically-actuated clutch of the transmission, and pump motor sensors positioned with respect to a pump motor of the fluid pump. The sensors are configured to measure electrical properties of the pump motor, and to output the measured electrical properties as input signals. A controller detects when the hydraulic circuit is fully charged by determining an actual speed of the pump motor. The controller calculates an average pump torque and a slope of the average pump torque for the pump motor using the input signals. A flag is set via the controller indicating that a calibrated line pressure has been attained in the hydraulic circuit when the slope of the average pump torque reaches zero and the speed of the pump motor reaches a calibrated speed.

Hydraulic system charge detection

An electro-mechanical drive-unit includes an input member, an output member, a drive-unit housing, and a gearing arrangement operatively connected to each of the output and input members. The drive-unit also includes a pump for circulating pressurized fluid and an electric motor. The electric motor includes a rotor connected to the gearing arrangement, a stator fixed relative to the drive-unit housing and having wire windings, and a motor housing configured to retain the rotor and the stator. The drive-unit also includes a fluid cavity between the drive-unit housing and the motor housing configured to receive the pressurized fluid. The drive-unit housing defines a passage in fluid communication with the fluid cavity. The drive-unit also includes a fastener having a head and a shank. The fastener is secured within the passage to facilitate discharging the fluid from under the fastener head onto the wire windings for cooling and/or lubrication thereof.

Electro-mechanical drive-unit

A transmission system of a vehicle comprises a pump, an auxiliary pump, and a transmission. The pump pressurizes transmission oil when an engine is operating. The auxiliary pump operably coupled to the pump and located parallel to the pump that pressurizes the transmission oil when the engine is not operating. The transmission selects a gear ratio based on the pressurized transmission oil.

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Indianapolis, IN, United States of America

Matthew R Knoth