Prime mover speed sensing system and method

Details Prime mover speed sensing system and method Prime mover speed sensing system and method

1986-04-16

1987-05-19

Shoop, Jr., William M.

Prime-mover dynamo plants

Electric control

Engine control

290 40R, 361 51, 361236, H02P 904, H02H 706

Patent

active

046671145

ABSTRACT:
A method and apparatus for detecting a failure in the speed sensing system of a rotating shaft prime mover. The control system for the rotating shaft prime mover includes a speed sensing system for measuring the rotational speed of the shaft, a speed feedback system for providing actual rotational speed, and a monitoring system for monitoring the speed sensing system. The monitoring system detects loss of speed signal and overspeed conditions. The speed pickup sensing system includes at least a first, second and third speed sensor. The monitoring system senses with the speed pickup sensors the rotational speed of the shaft to provide signals representative thereof. It selects between the first and second speed signal the signal representative of the actual rotational shaft speed to produce a primary speed signal. The system compares the primary speed signal to the third speed signal for producing a speed feedback fault signal when the primary signal deviates from the third signal by a predetermined value. Each of the speed signals are compared with each other for generating a speed pickup fault signal when any one of the speed signals deviates from another by a predetermined value. The primary signal is compared to a predetermined value for detecting an overspeed condition in the prime mover. An overspeed condition or a primary signal fault indication trips the prime mover. A loss of speed signal causes an indication to be displayed for the operator of the prime mover.

REFERENCES:
patent: 4217617 (1980-08-01), Rossi et al.
patent: 4464577 (1984-08-01), Wagner et al.
patent: 4520272 (1985-05-01), Danno et al.

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