| 摘要 |
A system for controlling the speed of a motor vehicle comprises means deriving a first electrical signal having a mean level related to the actual speed of the vehicle and an alternating component whose amplitude is related to the actual speed of the vehicle, means storing a second electrical signal having a mean level related to a desired value for the vehicle speed and substantially free of any alternating component, means arranged to compare the first and second electrical signals whereby to produce an error signal having a mean level related to the difference, if any, between the actual and desired vehicle speeds and an alternating component related to the actual vehicle speed, and speed correcting means responsive to the amplitude of the error signal for correcting the actual speed of the vehicle. Adjusting means for attenuating the amplitude of the alternating component of the error signal at higher vehicle speeds is provided, together with tuning means for phase shifting the first electrical signal at a speed, speed range or rate of change of speed.
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