Question

Automotive cruise control systems are used to hold the vehicle speed steady at a set value especially in long runs to prevent driver fatigue. After switched “ON” by the driver, this system takes the control of the gas throttle using an electronically controlled stepper motor, and keeps the vehicle speed constant. This system requires speed sensors to measure the controlled vehicle speed. a) Identify basic elements of the cruise control system. (Reference input, output, actuator, controller, sensor, plant) b) List any possible disturbances to the system during operation. c) Draw a simple block diagram. Clearly identify each block as one of the basic elements. d) Classify (also explain the reason) the system as; i. Open Loop or Closed Loop, ii. Regulator or Servomechanism.

Answer 1

An: The basic element on the cruise control system are shown in block diagram : Reference input, controller, sensor, plant, output, Actuator. Input Reference d clachon eoraz Controller sensor Actuator Plant Disturbance output

The possible disturbances to the system during operation are mainly due to environmental change which goes to the system or plant. This i the unwanded signal which will affect the control system output and results in an increase of the System error The system shown here e a automotive cruise control system. This ei a closed loop - system. It auto mancally regulate a process rarlable to a desired state or set point without interachon of human. on this system feeback came from to Sensor, brich i giren to the input. Finally.tu - input minus ou tout error given to controller.