YourDyno has several brake modes that can be used to control your brake.
There are a few terms to learn here.
Regulator: The regulator is the piece of software that calculates the best brake output to achieve your desired RPM at any time. YourDyno has two types of regulators, a PID regulator and a Load Control regulator. The PID regulator is used for Manual brake control, RPM Curve and for Power Sweep. Load control is a different regulator and is used for the Load Control mode.
Manual brake mode
Choose Manual RPM control to step through the RPM range manually (no RPM curve/sweep). This can be useful when mapping the engine, by keeping a set RPM and press the RPM+ button when you are ready for the next RPM.
The system is under PID control in this setting.
RPM Sweep brake mode
Choose “RPM curve” to make the engine follow a set RPM curve every time. Make a flat curve in the beginning to ensure RPM is stable when the sweep starts.
The run starts as soon as the RPM reaches the starting RPM of the curve. The system is under PID control in this setting throughout the whole sweep. Logging starts after the timeout given.
Power sweep brake mode
Power sweep is used to run through the RPM range and create a power graph (normal Dyno graph). The brake is under PID control during the sweep.
“Start run at:” RPM is the point where the power sweep starts.
“Wait” is how long the brake will hold at the start point to stabilize the start RPM.
“Sweep rate” is how fast the brake will let you progress through the sweep. Sweep rate can be positive (sweep up) and negative (sweep down).
“Stop sweep at:” RPM is where the sweep will end.
Load control is an alternative to PID control. It can be used when you want to sweep through the RPM register of the engine. It is useful for non linear systems, slow brake control, very fast torque increases and in general any time PID is difficult to make stable. See Load control to understand more about how the load control regulator works.
Use it like this:
“Start brake at RPM” is where the brake starts to turn on. This sets the start Reference RPM.
“Gain” sets how much the brake changes per 1000 RPM. For example 25% means the brake increases by 25% when RPM increases by 1000 relative to the reference RPM. There are two gains, one for the starting condition and one for the sweep. Start Gain is typically higher than Sweep Gain.
“Wait” defines how long the system waits before the sweep starts. Logging also starts after this timeout.
“Sweep rate” sets the sweep rate in for the reference RPM per second. Your engine will not sweep exactly in a straight line, this is normal. Sweep rate can be positive (=sweep up) and negative (= sweep down)
“Stop sweep at RPM” is when the sweep stops and logging stops.
“Derivative factor” should be 0 for most systems, except for water brakes. Use low numbers, like 0.05. It is applied to the start condition and to the sweep.
Start by setting the sweep rate to 0 and experiment with different gains and you will quickly get a hang of how this regulator works.