![]() So, if the cruise control is set at 60 mph and the car is going 50 mph, the throttle position will be open quite far. In a proportional control system, the cruise control adjusts the throttle proportional to the error, the error being the difference between the desired speed and the actual speed. First, let's start with one of the most basic control systems you could have - a proportional control. ![]() The most important input is the speed signal the cruise control system does a lot with this signal. The brake pedal and clutch pedal each have a switch that disengages the cruise control as soon as the pedal is pressed, so you can shut off the cruise control with a light tap on the brake or clutch.On this car, tapping the coast button once will cause the car to slow down by 1 mph. ![]()
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