The transfer function model for the cruise control problem is given below please see the cruise control: system modeling page for the derivation the parameters used in this example are as follows: the block diagram of a typical unity feedback system is shown below recall from the introduction: pid controller design page, the transfer. Automobile cruise control block diagram. Cruise control as we know it today was invented in the late 1940s, when the idea of using an electrically-controlled device that could manipulate road speeds and adjust the throttle accordingly was conceived working the cruise control system controls the speed of your car the same way you do – by adjusting the throttle (accelerator) position.