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Cruise control (also known as speed control, cruise command, autocruise, or tempomat) is a system that automatically controls the speed of an automobile. The system is a servomechanism that takes over the car's throttle to maintain a steady speed set by the driver.
Early cars had a hand lever to control the throttle, either directly, or by controlling an engine speed governor which in turn controlled both the throttle and timing. [6] In 1900 the Wilson-Pilcher car was introduced in Britain which had a hand controlled speed governor, and a foot throttle which could override the action of the governor.
[23] [59] This usually takes the form of one green light on the dashboard on cars from the 1950s or older, or two green indicator lights on cars from the 1960s to the present, and a rhythmic ticking sound generated electromechanically or electronically by the flasher. It is also required that the vehicle operator be alerted by much faster- or ...
The car will maintain the speed the driver sets until the driver hits the brake pedal, clutch pedal, or disengages the system. [37] Specific cruise control systems can accelerate or decelerate, but require the driver to click a button and notify the car of the goal speed. [37] ESC control light
Adaptive cruise control does not provide full autonomy: the system only provides some help to the driver, but does not drive the car by itself. [3] For example, the driver is able to set the cruise control to 55mph, if the car while traveling that speed catches up to another vehicle going only 45mph, the ACC will cause the car to automatically brake and maintain a safe distance behind the ...
Standard radar speed sign with block letters. Pictured with solar panel.. A radar speed sign or speed feedback sign is an interactive sign comprising a speed-measuring device (e.g. a loop detector or radar) and a message sign generally constructed of a series of LEDs, which displays vehicle speed of approaching motorists. [1]
The ECM is a type of electronic control unit (ECU), which is an embedded system that employs software to determine the required throttle position by calculations from data measured by other sensors, including the accelerator pedal position sensors, engine speed sensor, vehicle speed sensor, and cruise control switches.
Dashboard instruments displaying various car and engine conditions. Where the dashboard originally included an array of simple controls (e.g., the steering wheel) and instrumentation to show speed, fuel level and oil pressure, the modern dashboard may accommodate a broad array of gauges, and controls as well as information, climate control and entertainment systems.