REDUNDANT ELECTROHYDRAULIC REGULATING UNIT

• US 3,837,262 A
• Filed: 11/10/1972
• Issued: 09/24/1974
• Est. Priority Date: 03/26/1970
• Status: Expired due to Term

• Current Assignee: Dieter Hedermann
• Original Assignee: Dieter Hedermann
• Inventors: Hedermann, Dieter
• Primary Examiner(s): Maslousky, Paul E.
• Application Number:
  US05/305,321
• Time in Patent Office: 683 Days
• Field of Search: 91/363A,451,452,411A,365
• US Class Current: 91/365
• CPC Class Codes: B64C 13/00 Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes, or spoilers
• CPC Class Codes: F15B 18/00 Parallel arrangements of independent servomotor systems

Abstract

This invention relates to a redundant electrohydraulic regulating system for actuating control surfaces, rudders and the like of aircraft, the input signals of which are transmitted electrically by the pilot and by means of regulating and/or stabilizing devices, comprising, at least two servo chains or chains of regulating units, for purposes of detecting errors and/or malfunctions of one of the servo chains and preventing the inoperative servo chain from affecting the operation of the operative chain, each of the servo chains including, a servro or preliminary control valve; a main control valve, whose distributing slide valve is displaced or shifted in response to the operation of the servo or premilinary control valve; a fluid motor, which is displaced or moved by a pressure medium whose pressure is controlled by movements of the distributing slide valve of the main control valve; a position valve, whose distributing slide valve is mechanically coupled to the piston of the fluid motor and a differential pressure valve, which is actuated by the servo or preliminary control valve and, in conjunction with the position valve, interrupts the supply of pressure medium to the pressure chambers of the fluid motor of a faulty servo chain.

Claims

1. A redundant electrohydraulic regulating system for actuating control surfaces, rudders and the like in aircraft, wherein the electrohydraulic regulating system comprises two servo chains for detecting errors, each of said servo chains including a preliminary control valve actuatable by means of electrical input signals;

a main control valve, having a distributing piston valve displaceable in response to the operation of said preliminary control valve;

a fluid motor having pressure chambers and a piston, said piston being displaced by a supplied pressure medium whose pressure is controlled by said displacement of said distributing piston valve of said main control valve;

a position valve, having a distributing slide valve which is mechanically coupled to the piston of said fluid motor and a differential pressure valve, which is actuated by said preliminary control valve and, in conjunction with said piston valve, interrupts the supply of said pressure medium to the said pressure chambers of said fluid motor of a faulty servo chain.

2. A regulating system according to claim 1 wherein the differential pressure valve comprises an axially displaceable piston, which is retained in the central position thereof by means of compression springs.

3. A regulating system according to claim 1 which additionally includes a disconnecting valve, for giving a disconnecting signal hydraulically, in each of the servo chains.

4. A regulating system according to claim 1 which additionally includes mechanical coupling means coupling the position valve of one servo chain with the position valve of a second servo chain.

5. A regulating system according to claim 1 wherein the differential pressure valve of each servo chain includes an axially displaceable piston and a compression spring at the outwardly-positioned end of said piston, and the regulating system additionally includes mechanical coupling means coupling the inwardly-positioned end of said piston of said differential pressure valve of one servo chain with the inwardly-positioned end of said piston of said differential pressure valve of a second servo chain.