VECTO uses a PT1 function to model transient torque build up using this formula:
where:
ni
= current engine speed
T(ni) = PT1 time constant at engine
speed ni (col. 4 in .vfld file)
P_fld_stat(ni) = Static full load at engine
speed ni (col. 2 in .vfld file)
P_acti-1 = Engine power in previous time step