Double-signal digital telex anti-skid brake system
An anti-skid brake and dual-signal technology, which is applied in the field of digital fly-by-wire anti-skid brake system, can solve problems such as poor safety and achieve the effect of improving safety
Active Publication Date: 2014-03-26
XIAN AVIATION BRAKE TECH
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Problems solved by technology
[0004] In order to overcome the disadvantages of poor security of the existing digital fly-by-wire anti-skid braking system, the present invention provides a dual-signal digital fly-by-wire anti-skid braking system
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[0010] Power-off normally closed type, connected in series between the output end of the servo valve and the main wheel of the brake. When the output pressure of the servo valve can be adjusted normally, the anti-skid brake control box outputs a constant 28V voltage opening signal to the hydraulic solenoid valve. At this time, the hydraulic solenoid valve works in the normal open state, and the output pressure of the servo valve is directly applied through the hydraulic solenoid valve. To the main wheel of the brake, it is consistent with the single-signal digital fly-by-wire anti-skid brake system. The anti-skid brake control box outputs a changing control current to adjust the pressure output by the servo valve to realize anti-skid brake.
[0011] When the servo valve is stagnant due to oil pollution or some reason, the output pressure is constant and cannot be adjusted, and tire dragging and blowout are about to occur, causing immeasurable dangerous consequences to the aircr...
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The invention discloses a double-signal digital telex anti-skid brake system which is used for solving the technical problem that an existing digital telex anti-skid brake system is poor in safety performance. According to the technical scheme, a hydraulic solenoid valve is additionally arranged on a single-signal digital telex anti-skid brake system. When a plane lands and brakes, a braking instruction sensor outputs a voltage signal to an anti-skid brake control box, the anti-skid brake control box outputs a control current directly proportional to the voltage to a servo valve according to the input voltage signal, and the servo valve controls a braking main machine wheel to control braking of the plane. Because the two-position three-way hydraulic solenoid valve is additionally arranged at the output end of the servo valve, when the servo valve works normally, the hydraulic solenoid valve is normally open, and the anti-skid braking function is achieved by controlling and regulating a pressure signal of the servo valve. When the servo valve has a fault, the hydraulic solenoid valve works alternately between on and off output modes, the braking pressure can be regulated again, then, the plane can be made to brake in an anti-skid mode, and take-off and landing braking safety of the plane is further improved.
Description
technical field [0001] The invention relates to a digital anti-skid braking system by electric transmission, in particular to a double-signal digital anti-skid braking system by electric transmission. Background technique [0002] refer to figure 2 , the digital fly-by-wire anti-skid braking system of the existing aircraft mostly adopts single-signal control, that is, when the aircraft lands and brakes, the pilot's foot steps on the brake command sensor, and the brake command sensor outputs a 1.8-6.3V voltage signal proportional to the displacement of the pilot's foot. Anti-skid brake control box, according to the input voltage signal, the anti-skid brake control box outputs a 0-40mA control current proportional to this voltage (the specific current index is determined by the pressure-flow characteristics of the servo valve) to the servo valve, and controls output a The brake pressure proportional to the displacement of the pilot's foot is applied to the main wheel of the b...
Claims
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Inventor 黄智
Owner XIAN AVIATION BRAKE TECH