Abstract: A hydraulic control system for a transmission of a motor vehicle includes a source of pressurized hydraulic fluid that communicates with an analog electronic transmission range selection (ETRS) subsystem or a manual valve. The ETRS subsystem includes an ETRS valve, a park servo, a park mechanism, a mode valve, and a plurality of solenoids. The ETRS and manual valve communicate with a clutch actuator subsystem that engages a one-way clutch and six clutches/brakes.

Abstract: A hydraulic control system for a transmission of a motor vehicle includes a source of pressurized hydraulic fluid that communicates with an analog electronic transmission range selection (ETRS) subsystem or a manual valve. The ETRS subsystem includes an ETRS valve, a park servo, a park mechanism, a mode valve, and a plurality of solenoids. The ETRS and manual valve communicate with a clutch actuator subsystem that engages a one-way clutch and six clutches/brakes.

Abstract: A transmission range selection sensor includes a housing defining a bore extending along a central axis. A piston is slideably disposed within the bore. A magnet carrier is attached to and moveable with the piston. A magnet is supported by and moveable with the magnet carrier. A first magnetic sensor and a second magnetic sensor are supported by the housing and are spaced from each other along the central axis. A position of the magnet carrier along the central axis is determinable from a sensed magnetic flux from the first and second magnetic sensors. The sensor includes at least one magnetic flux concentrator attached to one of the magnet carrier or the housing. The flux concentrator is operable to concentrate the magnetic flux toward at least one of the first magnetic sensor or the second magnetic sensor depending upon a position of the magnet along the central axis.

Abstract: A transmission range selection sensor includes a housing defining a bore extending along a central axis. A piston is slideably disposed within the bore. A magnet carrier is attached to and moveable with the piston. A magnet is supported by and moveable with the magnet carrier. A first magnetic sensor and a second magnetic sensor are supported by the housing and are spaced from each other along the central axis. A position of the magnet carrier along the central axis is determinable from a sensed magnetic flux from the first and second magnetic sensors. The sensor includes at least one magnetic flux concentrator attached to one of the magnet carrier or the housing. The flux concentrator is operable to concentrate the magnetic flux toward at least one of the first magnetic sensor or the second magnetic sensor depending upon a position of the magnet along the central axis.

Abstract: A vehicle includes an engine, transmission, and controller. The transmission includes a clutch pack, a clutch piston, and a position sensor. The sensor measures a changing magnetic field with respect to the piston, and encodes the measured magnetic field as a raw position signal. The controller receives the raw position signal and processes the raw position signal through a signal processing module to generate a filtered signal attenuating signal noise in the position signal. The controller determines a commanded position of the piston, and calculates separate proportional (P), derivative (D), and integral (I) control terms using the commanded position and filtered position signal. The controller also calculates a feed-forward control term using the commanded position, and a required flow rate for actuating the clutch pack as a function of the PID terms and the feed-forward commanded position term. The controller actuates the clutch pack using the commanded flow rate.

Abstract: A vehicle includes an engine, transmission, and controller. The transmission includes a clutch pack, a clutch piston, and a position sensor. The sensor measures a changing magnetic field with respect to the piston, and encodes the measured magnetic field as a raw position signal. The controller receives the raw position signal and processes the raw position signal through a signal processing module to generate a filtered signal attenuating signal noise in the position signal. The controller determines a commanded position of the piston, and calculates separate proportional (P), derivative (D), and integral (I) control terms using the commanded position and filtered position signal. The controller also calculates a feed-forward control term using the commanded position, and a required flow rate for actuating the clutch pack as a function of the PID terms and the feed-forward commanded position term. The controller actuates the clutch pack using the commanded flow rate.

Abstract: A method of controlling a vehicle includes signaling a transmission to shift into a first gear ratio and sensing a current gear ratio of the transmission after signaling the transmission to shift into the first gear ratio. The method further includes implementing a diagnostic transmission shift control strategy to override a normal transmission shift control strategy when the current sensed gear ratio is not equal to the requested first gear ratio to verify proper functionality of a mode control valve that is responsible for shifting the transmission into the first gear ratio.

Abstract: A method of controlling a vehicle includes signaling a transmission to shift into a first gear ratio and sensing a current gear ratio of the transmission after signaling the transmission to shift into the first gear ratio. The method further includes implementing a diagnostic transmission shift control strategy to override a normal transmission shift control strategy when the current sensed gear ratio is not equal to the requested first gear ratio to verify proper functionality of a mode control valve that is responsible for shifting the transmission into the first gear ratio.