Drive Cycle Source

Once you have installed additional cycles, you can use set_param to set the drive cycle. For example, to use drive cycle US06:

set_param([gcs '/Drive Cycle Source'],'cycleVar','US06')

Dependencies

This table summarizes the parameter dependencies.

A workspace variable containing a monotonically increasing time vector, a velocity vector, and, optionally, a gear data vector. You can use a structure, 2-D array, or time series object. Enter units for velocity in the Source velocity units parameter field.

A valid point must exist for each corresponding time value. You cannot specify inf, empty, or NaN.

This table provides examples for using workspace variables to create your own drive cycles.

t = 0:1:100;
xdot = 5.*sin(t)+10;
myCycleS.time = t';
myCycleS.signals.values = xdot';

gears=[0, 1, 2, 3, 3, 4, 4, 4, 4, 4, 4];
t=0:1:10;
xdot=[0,5,10,15,20,25,30,30,30,30,30];
myCycleS.time=t';
myCycleS.signals.values=[xdot',gears'];

t = 0:1:100;
xdot = 5.*sin(t)+5;
myCycleA = [t',xdot'];

gears=[0, 1, 2, 3, 4, 4, 4, 5, 5, 5, 5];
t=0:1:10;
xdot=[0,5,10,15,20,25,30,40,50,60,60];
myCycleA=[t',xdot',gears'];

myCycleT = timeseries;
t = 0:1:100;
xdot = 5.*sin(t)+20;
myCycleT.Data = xdot';
myCycleT.Time = t';

myCycleT = timeseries;
gears=[0, 1, 2, 3, 4, 4, 4, 5, 5, 5, 5];
t=0:1:10;
xdot=[0,10,20,30,32,33,34,40,50,60,60];
myCycleT.Data = [xdot',gears'];
myCycleT.Time = t';

Dependencies

To enable this parameter, select Workspace variable from Drive cycle source.

File containing monotonically increasing time data, velocity data, and, optionally, gear data in column or comma-separated format. The block ignores units in the file. Enter units for source velocity in the Source velocity units parameter field.

sampcyc = 
         0         0
    0.5000    0.7000
    1.0000    2.0000 
    1.5000    3.6000
    2.0000    5.6000
    2.5000    7.9000 
    3.0000   10.3000
    3.5000   13.0000 
    4.0000   16.0000
    4.5000   19.0000
    5.0000   22.3000
    5.5000   25.7000
    6.0000   29.3000

You can import standard drive cycle file from an external source. For example, you can import the Worldwide Harmonized Motorcycle Emissions Certification and Test Procedure (WMTC) cycle by following the instructions on WTMC. Specifically:

If you provide the gear schedule using P, R, N, D, L, OD, the block maps the gears to integers.

For example, the block converts the gear schedule P P N L D 3 4 5 6 5 4 5 6 7 OD 7 to 80 80 0 1 2 3 4 5 6 5 4 5 6 7 8 7.

Dependencies

To enable this parameter, select .mat, .xls, .xlsx or .txt file from Drive cycle source.

Repeat the drive cycle if the simulation run time exceeds the length of the drive cycle.

To calculate the acceleration, the block implements Savitzky-Golay differentiation using a second-order polynomial with a three-sample point filter.

Dependencies

To create the output acceleration port, select Output acceleration. Selecting Output acceleration enables the Output acceleration units parameter.

Dependencies

Drive cycle start time, in s. For example, this plot shows a drive cycle with a start time of 10 s.

Dependencies

To enable this parameter, select the Drive cycle source parameter Wide Open Throttle (WOT).

Initial reference speed, in units that you specify with the Source velocity units parameter. For example, this plot shows a drive cycle with an initial reference speed of 4 m/s.

Dependencies

To enable this parameter, select the Drive cycle source parameter Wide Open Throttle (WOT).

Nominal reference speed, in units that you specify with the Source velocity units parameter. This is the maximum speed in the cycle. For example, this plot shows a drive cycle with a nominal reference speed of 28 m/s.

Dependencies

To enable this parameter, select the Drive cycle source parameter Wide Open Throttle (WOT).

Time to start vehicle deceleration, in s. For example, this plot shows a drive cycle with vehicle deceleration starting at 25 s.

Dependencies

To enable this parameter, select the Drive cycle source parameter Wide Open Throttle (WOT).

Final reference speed, in units that you specify with the Source velocity units parameter. For example, this plot shows a drive cycle with a final reference speed of 2 m/s.

Dependencies

To enable this parameter, select the Drive cycle source parameter Wide Open Throttle (WOT).

Drive cycle WOT simulation time duration, in s. For example, this plot shows a drive cycle with a total simulation time of 50 s.

Dependencies

To enable this parameter, select the Drive cycle source parameter Wide Open Throttle (WOT).

Input velocity units.

Dependencies

To enable this parameter, select the Drive cycle source parameter Wide Open Throttle (WOT), Workspace variable, or .mat, .xls, .xlsx or .txt file.

Output velocity units.

Specify the output acceleration units.

Dependencies

To enable this parameter, select Output acceleration.

Sample period. Set to 0 for continuous sampling. For discrete sampling, specify a non-zero period.

Select this parameter to enable drive cycle fault tracking. Use the parameters to specify the fault tolerances. If the vehicle speed is not within the allowable speed range, the block sets a fault condition.

Dependencies

Selecting this parameter enables these parameters:

Standardized tests specify the speed tolerance to use. Here are two examples:

Note that the units for the EPA schedule are mph and for the WLTP tests are km/h.

The block uses the speed tolerance to determine the allowable speed range at the reference time. Within the time span defined by the reference time +/- the time tolerance, the vehicle speed must be within the reference speed range +/- the velocity tolerance, or the block will set a fault condition. These figures illustrate how the block uses the velocity and time tolerances to determine the allowable speed range.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Enable fault tracking.

Standardized tests specify the units for speed tolerance. Here are two examples:

Dependencies

To enable this parameter, on the Fault Tracking tab, select Enable fault tracking.

Velocity feedback units. Set the value to the VelFdbk input port signal units.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Enable fault tracking.

The time tolerance, in units of seconds. Standardized tests specify the time tolerance to use. Here are two examples:

The block uses the time tolerance to determine the allowable speed range at the reference time. Within the time span defined by the reference time +/- the time tolerance, the vehicle speed must be within the reference speed range +/- the velocity tolerance, or the block will set a fault condition. These figures illustrate how the block uses the velocity and time tolerances to determine the allowable speed range.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Enable fault tracking.

Select this parameter to enable drive cycle failure tracking.

Dependencies

To enable this parameter, select Enable fault tracking. Selecting Enable failure tracking parameter enables these parameters:

Select this parameter to stop the simulation when the trace fails.

To enable this parameter, on the Fault Tracking tab, select Enable failure tracking.

Maximum number of faults allowed during the drive cycle. For the number specified by the standardized tests, use these settings:

If the number of faults exceeds the maximum number of faults, the block sets a fault failure.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Enable failure tracking.

Maximum duration of single fault, in s. For the time specified by the standardized tests, use these settings:

If any fault duration exceeds the maximum single fault time, the block sets a fault failure.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Enable failure tracking.

Maximum accumulated time spent under fault condition, in s.

If the accumulated time spent under fault condition exceeds the maximum total fault time, the block sets a fault failure.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Enable failure tracking.

Select this parameter to display a velocity trace window. Selecting this parameter can slow the simulation time.

Dependencies

Selecting this parameter enables these parameters:

Simulation trace update period, in s. Set to 0 for continuous sample period. For a discrete period, specify a non-zero rate.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Display simulation trace.

Simulation trace window update rate, in s.

Dependencies

To enable this parameter, on the Fault Tracking tab, select Display simulation trace.