Dynamic biasing arrangement for speed regulation

Claim 1

An improved vehicle speed regulator of the type having its output actuate degrees of vehicle motoring and braking in proportion to respective positive and negative error signals representative of the difference between actual speed and desired speed of a traction vehicle, wherein the improvement comprises: a. a first circuit coupled to receive said error signal and having amplification means to provide a low gain first output signal in response thereto; b. means for actuating a tractive effort in response to a positive regulator output and for actuating a braking effort in response to a negative regulator output; c. a second circuit coupled to receive the error signal when the error signal is positive, said second circuit having power means connected to integrating means when the summation of said error signal and the output of said integrating means reaches a first predetermined amplitude and when it subsequently decreases below a second predetermined amplitude, the output of said integrating means comprising a second output signal; and d. means for adding said first and second output signals during vehicle motoring to provide a speed regulator output having a high gain characteristic when the amplitude of the error signal lies outside a predetermined band of operation defined by said first and second predetermined amplitudes, and a low gain characteristic when the amplitude thereof lies inside said predetermined band of operation.