A Throttle-off turn-in event simulates the dynamics of a vehicle driving a constant
radius turn at steady state, the reaction of the vehicle due to a sudden removal of drive torque
during the cornering event in which the steer is ramped up.
The event includes a short straight section to allow the vehicle to come to steady state,
the constant radius circle, and throttle removal. The event is designed to simulate a
highway exit ramp maneuver. Appropriate vehicle and tire output requests are included. A
plot template is available to plot the results.
The event is similar to Throttle-off Cornering. Figure 1. Throttle-off Turn-in Event Figure 2.
The parameters available in the Throttle off turn in event are detailed in the following
table:
Parameter
Description
Units
Length unit selection (Model, m, ft)
Velocity unit selection (Model, m/s,
km/h, mph)
Acceleration unit selection (Model, m/s2, g’s)
Radius
The radius of the circle that the vehicle CG will follow during the constant
radius portion of the event.
Initial straight
The distance the vehicle is driven straight and corners in a given radius to
attain the steady state.
Velocity
The velocity of the vehicle during the event.
Initial lateral acceleration
Estimated initial lateral acceleration, calculated using the velocity and the
turn radius.
Turn direction
Direction the vehicle turns during the event (as seen by the driver).
Throttle step duration
Time duration the throttle controller takes to completely remove the drive
torque.
Steer ramp rate
Rate at which steering is ramped up after the drive torque goes to
zero.
Transient time
Time duration for which the vehicle makes the drive torque zero and ramps up
the steering.
Look ahead time
Look ahead time, used by the Driver Feedforward steering model.
Prediction step size
Maximum step size, used by the Driver Feedforward steering model.
Print interval
Time interval of data output to the plot file (.plt) and
graphics file (.h3d).
Reference
ISO 9816-2006 Passenger cars — Power-off reaction of a vehicle in a turn.
