Automatic limiting of helicopter engine torque

Details Automatic limiting of helicopter engine torque Automatic limiting of helicopter engine torque

1983-02-28

1986-01-14

Chin, Gary

Boots, shoes, and leggings

244 1713, 244180, G06F 1550

Patent

active

045649081

ABSTRACT:
A torque limiting altitude hold system for a helicopter engages torque limiting (56, 203) when excessive torque is anticipated (138, 202) as determined by the summation of present torque and torque rate times a reference value (126, 194) exceeds maximum torque with torque limiting engaged, altitude commands are faded out (42, 189) and torque commands are faded in (44, 190) and the collective command integrator is switched from altitude to torque (48, 54; 181, 185), torque limiting is ended in response to negative altitude commands or anticipated desired altitude signal (96, 150, 152; 205, 206); the anticipated desired altitude is determined by subtracting from the altitude error a time function of the altitude rate (84, 90; 193), torque limiting is not allowed to reengage for two seconds after disengaging (144, 204) nor within three seconds after reaching desired altitude during an automatic descent (146, 207), the system provides smooth transitions from altitude control to torque control, without oscillation or abrupt changes; control descents are arrested without torque limiting the engine.

REFERENCES:
patent: 4004756 (1977-01-01), Gerstine et al.
patent: 4109886 (1978-08-01), Tribken et al.
patent: 4129275 (1978-12-01), Gerstine et al.
patent: 4168045 (1979-09-01), Wright et al.
patent: 4385356 (1983-05-01), Verzella et al.

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