Transmission internal PTO clutch and method of control
AssigneeAllison Transmission, Inc.
InventorsMichael Foster, Douglas Burchett
Life of this patent
Estimating the term…
Abstract
A method of selectively controlling a power take-off (PTO) assembly includes positioning a clutch assembly radially between a shaft and a PTO gear, operably controlling the clutch assembly with a controller, and selectively engaging the clutch assembly with the controller. The controller monitors signals received from a plurality of sensors and compares the monitored signals with respective signal thresholds. The clutch assembly is engaged when the compared monitored signals are within the signal thresholds.
Claims20
A method of selectively controlling a power take-off (PTO) assembly, comprising:
- positioning a clutch assembly radially between a shaft and a PTO gear;
- operably controlling the clutch assembly with a controller;
- selectively engaging the clutch assembly with the controller;
- wherein the selectively engaging the clutch assembly step comprises:
- monitoring, by the controller, signals received from a plurality of sensors;
- comparing, by the controller, the monitored signals with respective signal thresholds;
- and
- engaging the clutch assembly when the compared monitored signals are within the signal thresholds;
- further wherein, the monitoring signals received from the plurality of sensors step comprises monitoring, by the controller, an engine speed sensor, a user input sensor, and a PTO output speed sensor.
A method of controlling a power take-off (PTO) assembly of a transmission, comprising:
- providing a user input, an engine, the transmission including a shaft, a hydraulic system, and fluid within the hydraulic system having a line pressure, a controller including a memory unit and a processor, and the PTO assembly including a PTO gear, a PTO output sensor, and a clutch assembly positioned between the PTO gear and the shaft;
- determining, by the controller, when a user input has been received;
- comparing, by the controller, the line pressure of the fluid to a pressure threshold stored in the memory after the user input has been received;
- engaging the clutch assembly, by the controller, when the line pressure is above the pressure threshold;
- detecting PTO speed with the PTO output sensor;
- and
- comparing, by the controller, an engine speed of the engine to the PTO speed when the clutch assembly is engaged;
- wherein, if a difference between engine speed and PTO speed is not within a predefined speed threshold value, the controller increases the line pressure.
A method for controlling a power take-off (PTO) assembly of a transmission, comprising:
- providing a controller, a user input, a pressure sensor, a valve, a shaft speed sensor, and the PTO assembly including a PTO gear, a PTO speed sensor and a clutch assembly disposed radially between the PTO gear and a shaft of the transmission;
- receiving, with the controller, a command from the user input indicating a desired engagement of the clutch assembly;
- comparing a line pressure detected by the pressure sensor to a pressure threshold stored in the controller;
- controlling the valve, with the controller, to restrict the clutch assembly from engaging the PTO gear when the line pressure is less than the pressure threshold;
- comparing a PTO speed measured by the PTO speed sensor to a shaft speed measured by the shaft speed sensor with the controller when the clutch assembly is in an engaged position;
- and
- disengaging the clutch, with the controller, when the comparing a PTO speed step indicates the PTO speed is not substantially the same as the shaft speed.
A method of selectively controlling a power take-off (PTO) assembly, comprising:
- positioning a clutch assembly radially between a shaft and a PTO gear;
- operably controlling the clutch assembly with a controller;
- selectively engaging the clutch assembly with the controller;
- wherein the selectively engaging the clutch assembly step comprises:
- monitoring, by the controller, signals received from a plurality of sensors;
- comparing, by the controller, the monitored signals with respective signal thresholds;
- and
- engaging the clutch assembly when the compared monitored signals are within the signal thresholds;
- further wherein, the controller does not engage the clutch assembly when a vehicle speed sensor indicates the vehicle speed is within a vehicle speed range.
Dependencies are inferred from the claim text.