Torque Converter Characteristics (.vtcc)

!!! The Torque Converter Model is still in development !!!


This file defines the torque converter characteristics as described in VDI 2153:
Speed Ratio (ν) = Output Speed / Input Speed
Torque Ratio (μ) = Output Torque / Input Torque
Input Torque (Tref(ν)) is the input torque (over ν) for a specific reference engine speed (see below).

The Input Torque at  reference engine speed is needed to calculate the actual engine torque using this formula:

with:
Tin = engine torque [Nm]
Tref(ν) = reference torque at reference rpm (form .vtcc file) [Nm]
nin = engine speed [1/min]
nref = reference rpm [1/min] (see below)

The torque converter characteristics must also be defined for speed ratios of more than one (ν>1) in order to calculate overrun conditions (torque<0).


File Format

The file uses the VECTO CSV format.

Format:
Columns:
Speed Ratio ν Torque Ratio μ Input Torque at reference rpm
... ... ...
... ... ...