Transmission control system and method thereof
First Claim
1. A method of managing a transmission ratio with an assisted continuously variable transmission CVT adapted to transmit motive power between a power source and a drive mechanism operatively connected to the power source with the assisted CVT, the CVT comprising a pair of pulleys interconnected with a belt, the method comprising:
- managing a substantially constant power source rotational speed of the power source with a governor;
managing a power source torque output of the power source with the assisted CVT; and
managing a transmission ratio of the assisted CVT to manage the rotational speed of the drive mechanism, on a basis of a drive mechanism load variation and a CVT input rotational speed, to maintain a substantially constant power source rotational speed, whereby the CVT matches the power source torque output with the drive mechanism load.
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Accused Products
Abstract
A method of managing a transmission ratio with an assisted CVT with a governed engine to emulate a hydrostatic transmission and prevent a drivebelt abuse is provided, the method comprising: providing a reference power source rotational speed, using the assisted CVT to transmit rotatable motion between a power source and a drive mechanism, managing a torque of the power source to maintain a substantially even rotational speed upon a power source load variation and modulating a transmission ratio of the assisted CVT to change the rotational speed of the drive mechanism. A system and a vehicle having such a drivebelt abuse preventing mechanism is also provided.
36 Citations
18 Claims
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1. A method of managing a transmission ratio with an assisted continuously variable transmission CVT adapted to transmit motive power between a power source and a drive mechanism operatively connected to the power source with the assisted CVT, the CVT comprising a pair of pulleys interconnected with a belt, the method comprising:
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managing a substantially constant power source rotational speed of the power source with a governor; managing a power source torque output of the power source with the assisted CVT; and managing a transmission ratio of the assisted CVT to manage the rotational speed of the drive mechanism, on a basis of a drive mechanism load variation and a CVT input rotational speed, to maintain a substantially constant power source rotational speed, whereby the CVT matches the power source torque output with the drive mechanism load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for emulating a hydrostatic transmission comprising:
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an assisted continuously variable transmission CVT, comprising a pair of pulleys interconnected with a belt, adapted to operatively interconnect a power source with a drive mechanism, the power source being adapted to be maintained at a substantially constant rotational speed with a governor; a management module adapted to manage the assisted CVT; an engagement behavior control, operatively connected to the management module, adapted to manage an engagement of the assisted CVT; a power source rotational speed control connected to the management module; and a drive mechanism ratio control connected to the management module, the assisted CVT ratio, adapted to define the rotational speed of the drive mechanism, being made on the basis of an actuation of the drive mechanism ratio control, of drive mechanism load variation and a CVT input rotational speed, to maintain a substantially constant power source rotational speed, whereby the CVT substantially matches the power source torque output with the drive mechanism load. - View Dependent Claims (15, 16)
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- 17. A vehicle including a power source and an assisted continuously variable transmission CVT capable of emulating an hydrostatic transmission, the power source being operatively connected to a governor adapted to maintain a power source rotational speed at a substantially constant rotational speed while managing a torque provided by the power source to react to a load applied to the power source by a drive mechanism, the assisted CVT, comprising a pair of pulleys operatively interconnected with a belt, being adapted to backshift to reduce the load applied to the power source by the drive mechanism when the load applied to the power source by the drive mechanism reduces the rotational speed of the power source.
Specification