초록 ▼

An automatic speed control for a heavy duty vehicle includes a controller which regulates communication between a compressed air source and an air actuated throttle mechanism. The controller generates a control signal which is a function of a speed error signal and the position of the air actuated t

An automatic speed control for a heavy duty vehicle includes a controller which regulates communication between a compressed air source and an air actuated throttle mechanism. The controller generates a control signal which is a function of a speed error signal and the position of the air actuated throttle to regulate the compressed air source. The speed error signal is calculated as the difference between a commanded speed signal and an actual speed signal. To generate the control signal, the error signal and throttle position signal are operated on by different lead-lag transfer functions. These lead-lag terms are thereafter combined with a proportional speed error term to yield the desired control signal. The system further includes a throttle control feature for powering auxiliary equipment when the actual speed signal is zero. Another feature of the control limits the commanded speed signal to a set value when it exceeds a predetermined limit.

대표청구항 ▼

An automatic speed control system for a vehicle with an engine comprising: a cruise control means for controlling the speed of the vehicle to an operator-commanded speed when the vehicle is moving by generating a cruise control signal; a throttle control means for controlling the speed of the engine

An automatic speed control system for a vehicle with an engine comprising: a cruise control means for controlling the speed of the vehicle to an operator-commanded speed when the vehicle is moving by generating a cruise control signal; a throttle control means for controlling the speed of the engine of the vehicle to an operator-desired speed when the vehicle is stationary by generating a throttle control signal; a duty cycle translator, responsive to said control signals, for cyclically actuating a pair of electrically actuated valves a varying percentage of time each cycle dependent upon the value of said control signals; and mode control means for switching control of the system between said cruise control means and said throttle control means, wherein said mode control means switches the input of said duty cycle translator between said throttle control signal and said cruise control signal in response to whether the vehicle is moving or stationary.