STISIM Drive (SDL) - BRK - Brake

Note: This event only pertains to systems using the simple dynamics and will have no affect on systems using the advanced dynamics.

This event allows you to place an event into the your simulation scenario that controls the brake pedal input. This event is generally used in connection with the RSA event to put the driver into a situation where the vehicle begins to spin, thus forcing the driver to correct the problem using a steering input. One of the problems with an event like this is determining when the brakes will be released, therefore several options have been included so that you can customize the braking as much as possible. In any braking case, if the brakes are applied long enough so that the vehicle comes to a complete stop, then the brakes will automatically be released and control given back to the driver.

EVENT PARAMETERS:

PARAMETER 1:	Percentage of brake input to use. A value of 0 would be no braking at all, whereas a value of 100 would be a full braking input.
PARAMETER 2:	Type of threshold where the braking ends: 0 - Time 1 - Distance 2 - Absolute velocity (when the velocity drops below a set velocity 3 - Relative velocity (when the velocity drops by the specified amount)
PARAMETER 3:	Magnitude of the brake on threshold. For time (parameter 2 set to 0) this parameter is specified in seconds. For distance (parameter 2 set to 1) this parameter is specified in feet. For velocity (parameter 2 set to either 2 or 3) this parameter is specified in feet/second.

EXAMPLE:

1000,BRK,100,0,3
2000,BRK,25,1,200
3000,BRK,50,2,30
4000,BRK,100,3,30

Several examples of the braking event are shown above. In the first example, the brakes will be applied after the driver has traveled 1000 feet down the road (1000,BRK). When the brakes are applied, it will use full braking (100) and the brakes will remain on for a total of 3 seconds (0,3). In the second example, the brakes will be applied after the driver has traveled 2000 feet down the road (2000,BRK) but this time when the brakes are applied only 25 percent of their capacity will be used (25). For this example the brakes will remain on until the driver has traveled another 200 feet down the road (1,200). The final 2 examples use velocity for their end of braking thresholds. In the first of these examples, at 3000 feet 50 percent of the braking capacity will be used (3000,BRK,50). In this case when the driver’s speed drops to 30 feet/second (roughly 20 mph) the brakes will be released. In the second velocity example, the brakes are applied at 4000 feet and uses the full capacity of the brakes (4000,BRK,100). In this case the brakes are released when the driver’s speed drops a total of 30 feet/second (roughly 20 mph). For example if the driver’s vehicle was traveling at 100 feet/second when the brakes were applied, the brakes would remain on until the speed drops to 70 feet/second (100-30).