The dynamics of a gas engine vary strongly over its power range with controlled engine speed. The major nonlinearities result from the turbo charger driven by exhaust gas. The recirculation valve adjusts the power of the turbo charger, by leading part of the compressed mixture back to the inlet. The position of the throttle valve affects the mass flow into the engine. Both actuators are used to control the engine speed. In order to optimize the switching between the actuators, LQG control is applied.For linear state feedback control suitable states have to be determined and unmeasured states must be estimated in an acceptable way. This paper shows that LQG control is able to enhance the performance of the engine speed control by using both actuators simultaneously.
In this paper the design of a robust H∞ controller for the speed control of a natural gas engine is presented. The gas engine is an internal combustion engine, has multi input -single output structure, is open loop unstable and has nonlinear behavior. In order to obtain proper performance at any operating point of the power range of the engine, a robust H∞ controller was utilized for speed control. One requirement is integral action of the controller, thus, due to physical limitations of the controlled inputs, an anti-windup technique is presented. Simulations as well as test bench runs were performed, and the results are also compared with a state of the art gain scheduled PID controller.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.