A throttle is used to control the engine, which is able to set the engine speed at the desired working point. This throttle has a PID controller that takes feedback from the engine speed and uses a servo motor to set the engine at the desired speed. This gas killer is shown in the figure below
You can see this article and this article to learn about other services of Mobtakeran Pars Andish Be Khasavi Industrial Company in the field of dynamometers.
