Filtering pulley, system comprising such pulley and related control method

The transmission system for a vehicle comprising:

• an internal combustion engine and at least one electric engine/generator, each comprising a respective pulley configured to cooperate with an endless transmission element to transmit torque between the said internal combustion engine and at least one electric engine/generator,
• at least said pulley of said internal combustion engine comprising:
• a hub configured to be fixed to a shaft rotating around an axis,
• a crown mounted coaxial and rotationally free on said hub,
• a plurality of elastic groups arranged circumferentially with respect to said hub and said crown and interposed, each, between a pair of first elements integral to said hub and between a pair of second elements integral to said crown,
• wherein said first elements include at least two spokes, carried by an actuator, said actuator including a coupling portion carried by said hub and an actuator portion defining said spokes carried by said crown,
• wherein said pulley of said internal combustion engine includes coupling means configured to allow a selective coupling of said coupling portions and said actuator portion to define a first configuration in which they cooperate so that said crown is operationally connected to said hub and a second configuration in which they are operationally separated so that said crown is operationally disconnected from said hub, and said pulley of said internal combustion engine includes actuating means configured to control said coupling means, and
• torque sensing means configured to detect the torque transmitted by said internal combustion engine and at least one electric engine/generator, and an electronic unit electrically connected to said torque sensing means and configured to control said actuating means on the basis of the values detected by said torque sensing means and/or sensor means configured to detect a relative angular position of said crown with respect to said hub, said actuating means controlling said coupling means on the basis of said relative angular position.

The method of controlling a pulley of a transmission system for a vehicle comprising an internal combustion engine and at least one electric engine/generator, each comprising a respective pulley configured to cooperate with an endless transmission element to transmit torque between the said internal combustion engine and at least one electric engine/generator, at least said pulley of said internal combustion engine comprising a hub configured to be fixed to a shaft rotating around an axis, a crown mounted coaxial and rotationally free on said hub, a plurality of elastic groups arranged circumferentially with respect to said hub and said crown and interposed, each, between a pair of first elements integral to said hub and between a pair of second elements integral to said crown, said first elements including at least two spokes, carried by an actuator, said actuator including a coupling portion carried by said hub and an actuator portion defining said spokes carried by said crown, said pulley including coupling means configured to allow a selective coupling of said coupling portions and actuator portion to define a first configuration in which they cooperate so that said crown is operationally connected to said hub and a second configuration in which they are operationally separated so that said crown is operationally disconnected from said hub,

• in which said endless element is not in motion to transfer torque between said elements of said system, said method comprising the steps of:
• receiving a request to decouple said crown to said hub;
• checking said motor-generator to provide an oscillating torque value in a predetermined torque range;
• checking said actuating means to decouple or couple said crown to said hub while said motor-generator provides said oscillating torque value.