POWER TAKE OFF SPEED INTERLOCK
First Claim
Patent Images
1. Apparatus comprising:
- an electric motor;
a transmission mechanically coupled to the electric motor;
a power take off mechanically coupled to the transmission, the power take off having an output shaft and a coupler;
the coupler having engaged and disengaged states wherein in the engaged state of the coupler the transmission is mechanically linked to the output shaft and in the disengaged state of the coupler the transmission is mechanically free of the output shaft of the power take off;
an actuator for moving the coupler between its engaged and disengaged states;
an angular velocity sensor for the electric traction motor;
a source for requests to supply power to the output shaft of the power take off; and
a controller responsive to a current request to supply power to the output shaft of the power take off when the coupler is in its disengaged state for operating the actuator to move the coupler to its engaged state when the angular velocity of the electric traction motor is with selected limits.
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Abstract
A hybrid-electric vehicle powertrain including a first prime mover and an electric traction motor/generator provides for electric operation of a power take off. A sensor indicates electric fraction motor/generator speed. A control system provides for limiting engagement of the power take off to the electric traction motor/generator through a transmission to periods when the electric traction motor/generator is turning a less than a predefined maximum speed.
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Citations
15 Claims
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1. Apparatus comprising:
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an electric motor; a transmission mechanically coupled to the electric motor; a power take off mechanically coupled to the transmission, the power take off having an output shaft and a coupler; the coupler having engaged and disengaged states wherein in the engaged state of the coupler the transmission is mechanically linked to the output shaft and in the disengaged state of the coupler the transmission is mechanically free of the output shaft of the power take off; an actuator for moving the coupler between its engaged and disengaged states; an angular velocity sensor for the electric traction motor; a source for requests to supply power to the output shaft of the power take off; and a controller responsive to a current request to supply power to the output shaft of the power take off when the coupler is in its disengaged state for operating the actuator to move the coupler to its engaged state when the angular velocity of the electric traction motor is with selected limits. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle powertrain comprising:
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an engine; an electric traction motor/generator; a clutch disposed for mechanically coupling the engine with the electric traction motor/generator; a sensor for indicating electric traction motor/generator speed; a transmission coupled to the electric traction motor/generator and having a driveshaft output; a power take off attached to the transmission from which the power take off can receive rotational impetus and torque; an output shaft from the power take off; a coupler within the power take off which in an engaged state transmits rotational impetus and torque from the transmission to the output shaft; an actuator for moving the coupler between its engaged state and an unengaged state; and means for preventing operation of the actuator to move the coupler from its unengaged state to its engaged state when the electric traction motor/generator is turning a greater than a predefined speed. - View Dependent Claims (8, 9, 10, 11)
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12. A method of operating a power take off from a hybrid-electric vehicle powertrain, the hybrid-electric vehicle powertrain including an engine, an electric traction motor/generator, a clutch for mechanically coupling the engine with the electric traction motor/generator, and a transmission coupled to the electric traction motor/generator and having a driveshaft output with the power take off including a coupler and an output shaft with the coupler being operable for engaging the output shaft to the transmission for the transmission of rotational impetus and for disengaging the coupler, the method comprising the steps of:
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providing an electrified power take off mode in which the clutch is disengaged and in which the coupler may be operated for engagement of the output shaft with the transmission and disengagement of the output shaft with the transmission; defining a first set of conditions under which the coupler remains engaged during operation in the electrified power take off mode; monitoring electric traction motor/generator speed; and defining a second set of condition which includes all of the first set of conditions and at least a first condition relating to electric traction motor/generator speed under which the coupler is allowed to move to an engaged condition from a disengaged condition during operation in the electrified power take off mode. - View Dependent Claims (13, 14, 15)
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Specification