How can I simulate a vehicle coasting down a slope using the Torque Converter block in SimDriveline?

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I am trying to use the Torque Converter block in a model that simulates a coasting vehicle. However, the block seems to be unable to handle this condition, and I get an error message indicating that the speed ratio data points must be greater than or equal to zero, and strictly less than one.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 8 Nov 2011
This enhancement has been incorporated in Release 2011b (R2011b). For previous product releases, read below for any possible workarounds:
The existing Torque Converter block model is symmetric, with the speed ratios greater than one being inverted and the reverse torque applied. The dialog box only accepts speed ratios between 0 and 1.
Real torque converters are not symmetric, but for coasting scenarios, the symmetric model does work. If the speed ratio varies between 0.5 and 2, the values greater than 1 are mapped to their inverses. For example, 2 is mapped to 0.5.
Users can also implement their own torque converter models. Start by looking under the mask of the Torque Converter block. Modify the existing model and save it under a new, user-defined library.

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