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Apparatus for automatically eliminating control force errors in aircraft, especially helicopters

  • US 4,607,202 A
  • Filed: 08/27/1985
  • Issued: 08/19/1986
  • Est. Priority Date: 08/28/1984
  • Status: Expired due to Fees
First Claim
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1. In an apparatus for automatically eliminating control-force errors arising in an aircraft, especially a helicopter, due to disturbing forces acting upon a control stick for adjusting elevator means or rotor blades, wherein a control linkage is articulated to said control stick for connecting the control stick to a main control drive, wherein a control rod is operatively connected with one end to said control stick approximately opposite said control linkage, the other end of said control rod being operatively arranged for cooperation with a spring box enclosing a pre-tensioned spring, and wherein a trimming motor is also operatively arranged for cooperation with said spring box through a trimming member, the improvement comprising displacement difference pickup means for measuring a difference between the control displacement of said control linkage (2) and the displacement of said trimming member (15) to provide a respective difference signal, control force pickup means (10) for measuring the pilot'"'"'s hand force applied to the control stick (1) to provide a respective hand force output signal (PH);

  • signal limiter circuit means (12) connected to receive said output signal from said control force pickup means (10) to provide a respective output signal (PH1 ), signal summing means (13) connected for subtracting said output signal (PH1) of said signal limiter circuit means (12) from said output signal of said control force pickup means (10) to provide a further difference signal (PH2 ), amplifier means (11) connected to receive said further difference signal from said signal summing means (13), to provide an amplified signal, further summing circuit means (9) connected to receive said first mentioned difference signal and said amplified signal to provide a trimming motor control signal, and means connecting said further summing circuit means to said trimming motor for controlling said trimming motor in response to said trimming motor control signal.

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