Automatic speed control for heavy vehicles

Details Automatic speed control for heavy vehicles Automatic speed control for heavy vehicles

1980-10-27

1983-08-30

Lall, Parshotam S.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123353, 123403, 123339, 180170, 180178, B60K 3100

Patent

active

044010753

ABSTRACT:
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.

REFERENCES:
patent: 2883975 (1959-04-01), Spetner
patent: 3104741 (1963-09-01), McDougal
patent: 3952829 (1976-04-01), Gray
patent: 3964457 (1976-06-01), Coscia
patent: 4203395 (1980-05-01), Cromas et al.
patent: 4245599 (1981-01-01), De Lauriers
patent: 4286685 (1981-09-01), Rudolph et al.
patent: 4297978 (1981-11-01), Matsui
patent: 4305360 (1981-12-01), Meyer et al.

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