CVT - MapleSim Help

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CVT

Continuously Variable Transmission component

The CVT component models the Continuously Variable Transmission. The CVT is a type of transmission that allows changes in gear ratio without the “bumps” experienced with discrete gear changes. Mechanically, a CVT has two conical pulleys, connected by a belt drive. Changes in ratio are effected by adjusting the gap between the two sides of the pulleys, thus changing the relative diameters of the pulley and hence the gear ratio.

Kinematic Equation

Ideal Case

Non-Ideal Case

Where

kappa = piecewise(omega[a].tau[a] >= 0, 1-S[r], omega[a].tau[a] < 0, 1-1/S[r])

and is the slip number (user input), also the torque loss is defined as

tau[loss] = piecewise(omega[a].tau[a] >= 0, (1-eta).tau[a], omega[a].tau[a] < 0, (1-1/eta).tau[a])

where is the torque efficiency (user input). Also

Connections

Name	Condition	Description	ID
	-	Flange to driver shaft	flange_a
	-	Flange to driven shaft	flange_b
r	-	Base (geometric) CVT ratio	ratio
		Conditional real input port for the slip number	slip_number
		Conditional real input port for the torque efficiency	efficiency