The command input represents the user input, that is setting the desired vehicle velocity to v 0 mph. Let us consider the block diagram of a closed loop control system as shown in the. This is achieved through a radar headway sensor, digital signal. The block diagram input is rs, which is the lt of rt, the command input to the cruise control. Adaptive cruise control is becoming more common in new cars, but what does it actually do, and which automaker has the best tech. Steep grades may cause variations in selected speeds. The main components of the cruise control system include the. We explore how they are used to describe complex systems as well as how to perform block diagram algebra aka block diagram. Without cruise control, long road trips would be more tiring, for the driver at least, and those of us suffering from leadfoot syndrome would probably get a lot more speeding tickets. Cruise control is an invaluable feature on american cars. The driver drives the car at the desired speed, the cruise control system is activated by pushing a button and the system. The purpose of cruise control is to keep the velocity of a car constant.
Cruise control system block diagram and its explanations. However, unlike conventional cruise control, this new system can automatically adjust speed in order to maintain a proper distance between vehicles in the same lane. The cruise control system controls the speed of your car the same way you do by adjusting the throttle accelerator position. Cruise control as we know it today was invented in the late 1940s, when the idea of using an electricallycontrolled device that could manipulate road speeds and adjust the throttle accordingly was conceived. The cruise control is a system that is capable of automatically maintaining the desired speed i. Create a system block diagram for the cruise control case. System has capability to cruise, coast, resume speed, accelerate, and tapup and tapdown. Adaptive cruise control is similar to conventional cruise control in that it maintains the vehicles preset speed.
Block diagrams consist of a single block or a combination of blocks. Answer to a block diagram of a contr ol system is shown in fig. This video explains how cruise control keeps a car running at a constant speed. What is the cruise control system and how does it work in. The basic elements of a block diagram are a block, the summing point and the takeoff point. Acc vehicle the subject vehicle equipped with the acc system. Cruise control is far more common on american cars than european cars, because the roads in america are generally bigger and straighter, and. In this video we introduce block diagrams aka signal flow diagrams. These are used to represent the control systems in pictorial form.