Logic-Controlled Clutch

R2026b

Friction clutch with input control

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Logic-Controlled Clutch block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simscape / Driveline / Clutches

Description

The Logic-Controlled Clutch represents a logic-controlled mechanism that transmits rotational power through friction. The block is an advanced version of the Fundamental Friction Clutch block. You control the Logic-Controlled Clutch block with physical signal at port E.

If the clutch is engaging and in motion, the block applies the kinetic torque. If the clutch is engaging and not in motion, the block applies the static torque.

Examples

Washing Machine Fault Analysis

Model a washing machine and introduce a fault in its operation. The machine water supply faults at a specific time and this example models the system response under this scenario. The electric motor switches off and the machine operation is aborted by discharging the partially filled outer drum.

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Ports

Input

E — Control clutch engagement

physical signal

Physical signal port associated with the clutch logic.

Programmatic Use

Port: E

Conserving

B — Base interface

mechanical rotational

Mechanical rotational conserving port associated with the base interface.

Programmatic Use

Port: B

F — Follower interface

mechanical rotational

Mechanical rotational conserving port associated with the follower interface.

Programmatic Use

Port: F

Parameters

Transition model — Clutch engagement parameterization

Instantaneous (default) | First-order lag | Scaled by input

Clutch engagement transition control. When you select:

• Instantaneous — The clutch engages when the input signal at port E rounds to 1, and the clutch does not engage when the input signal rounds to 0.

• First-order lag — The block introduces a first-order delay to the clutch engagement according to the value that you specify for the Transition time constant parameter.

• Scaled by input — The block smooths the signal input at port E. The block applies full static and kinetic friction when the input signal is greater than or equal to 1 and no static or kinetic friction torque when the signal is nonpositive. The block linearly scales the friction torques when the input signal is between 0 and 1.

Programmatic Use

Parameter:	transition_model
Values:	"sdl.enum.transitionModel.instant" | "sdl.enum.transitionModel.timeConstant" | "sdl.enum.transitionModel.scaled"

Transition time constant — First-order lag time constant

0.1 s (default) | positive scalar

Time constant for first-order lag clutch engagement.

Dependencies

To enable this parameter, set Transition model to First-order lag.

Programmatic Use

Parameter: transition_time_constant

Kinetic friction torque — Kinetic friction torque threshold

10 N*m (default) | nonnegative scalar

Minimum torque threshold to maintain relative motion between the clutch plates.

Programmatic Use

Parameter: t_friction

Static friction torque — Static friction torque threshold

20 N*m (default) | positive scalar

Minimum torque threshold to cause relative motion between the clutch plates.

Programmatic Use

Parameter: t_locked

Clutch velocity tolerance — Motion boundary condition

0.001 rad/s (default) | nonnegative scalar

Clutch minimum angular velocity.

Programmatic Use

Parameter: w_tol

Initial State — Clutch condition at simulation start

Unlocked (default) | Locked

Option to start the simulation with the clutch unlocked or locked.

Programmatic Use

Parameter:	initial_state_locked
Values:	"sdl.enum.initial_lock.unlocked" | "sdl.enum.initial_lock.locked"

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"sdl_lib/Clutches/Logic-Controlled Clutch"

Example: add_block("sdl_lib/Clutches/Logic-Controlled Clutch","myModel/myBlock",MakeNameUnique="on")

For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2016b