An automatic timing device and measurement method for the rapidity of aircraft brake pressure response

Abstract

The present invention relates to the technical field of aviation repair and debugging, and specifically relates to an automatic timing device and measurement method for the rapidity of aircraft brake pressure response. The automatic timing device includes a brake pedal, a brake pressure inspection pipeline, a changeover switch connected to the brake pedal and the brake pressure inspection pipeline, and a timer connected to the changeover switch; stepping on / releasing the brake pedal is used as the starting timing signal for the rapidity of brake pressure response timing; the brake pressure in the brake pressure inspection pipeline is used as the ending timing signal for the rapidity of brake pressure response timing. The present invention can solve the inaccuracy of timing caused by manual timing of the rapidity of brake pressure response. By setting a contact switch at the pedal end as the trigger condition for starting timing and setting a pressure signal at the brake pressure end as the trigger condition for ending timing, the automatic timing of the rapidity of brake pressure response is realized, reducing the error of manual timing and improving the timing accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation repair and debugging, and specifically relates to an automatic timing device and measurement method for the rapidity of aircraft brake pressure response. Background Technique

[0002] The aircraft brake system is used to decelerate the aircraft to a stop during the landing roll of the aircraft and to perform emergency deceleration braking during the pre-takeoff roll. If the rapidity of the brake pressure rise and fall response of the brake system does not meet the standard, it may lead to accidents such as the aircraft being unable to brake in time during the roll phase, running off the runway, or having a flat tire, affecting flight safety.

[0003] For a certain type of aircraft, it is required that when the brake pedal is rapidly depressed, the time for the system brake pressure to rise to the specified pressure should not be greater than 0.5 s; when the brake pedal is rapidly released from the depressed position, the time for the system brake pressure to drop below the return oil pressure should not be greater than 0.5 s. The existing method for measuring the brake response time is to start timing by pressing a stopwatch when stepping on the foot pedal, and at the same time, visually observe when the brake pressure rises to the required value and then press the stopwatch to stop timing, and read the timing time on the stopwatch to determine whether the requirement is met. The accuracy of the measured value is completely determined by the reaction time of a person, and the reaction time of a normal person is above 0.1 s. Therefore, there is a large error through this measurement method, and it is very easy to cause the measurement result of the brake performance index not to meet the standard. Therefore, it is necessary to study a new measurement scheme to achieve automatic timing of the rapidity of brake pressure response, reduce the error caused by manual timing, and improve the accuracy of timing. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention proposes an automatic timing device and measurement method for the rapidity of aircraft brake pressure response. By stepping on or releasing the brake pedal to trigger the timer to start timing, and when the brake system pressure reaches the specified value, the timer automatically stops timing, thereby realizing the automatic timing of the rapidity of brake pressure response and improving the rapidity and accuracy of timing.

[0005] The technical problems to be solved by the present invention are realized by adopting the following technical solutions:

[0006] An automatic timing device for the rapidity of aircraft brake pressure response, comprising a brake foot pedal, a brake pressure inspection pipeline, a changeover switch connected to the brake foot pedal and the brake pressure inspection pipeline, and a timer connected to the changeover switch;

[0007] Stepping on / releasing the brake foot pedal is used as the start timing signal for the rapidity of brake pressure response timing;

[0008] The brake pressure through the brake pressure inspection pipeline is used as the stop timing signal for the rapidity of brake pressure response timing;

[0009] The conversion switch is used to switch the timing control of the brake pressure rising response time when stepping on the brake pedal and the brake pressure falling response time when releasing the brake pedal, and to receive the start and stop timing signals;

[0010] The timer automatically times the brake pressure response time according to the start and stop timing signals transmitted by the conversion switch.

[0011] Preferably, a contact switch is provided on the brake pedal, and the contact switch is connected to the conversion switch through a cable.

[0012] Preferably, the contact switch includes a normally open contact switch and a normally closed contact switch.

[0013] Preferably, the conversion switch is connected to the timer through a cable.

[0014] Preferably, the conversion switch is provided with "step on" and "release" switching positions.

[0015] Preferably, the brake pressure inspection pipeline is connected with a pressure switch through a hydraulic hose and a conduit joint, and the pressure switch is connected to the conversion switch through a cable.

[0016] Preferably, the pressure switch includes a normally closed pressure switch and a normally open pressure switch.

[0017] Preferably, the normally closed pressure switch and the normally open pressure switch are arranged on the mounting bracket.

[0018] A measuring method for an automatic timing device for the rapidity of aircraft brake pressure response, applying an automatic timing device for the rapidity of aircraft brake pressure response, includes the following steps:

[0019] Step (1) Connect the normally open contact switch, the normally closed contact switch to the conversion switch through a cable, connect the conversion switch to the timer, connect the normally closed pressure switch, the normally open pressure switch to the conversion switch, and connect the normally closed pressure switch, the normally open pressure switch to the brake pressure inspection pipeline through a conduit joint and a hydraulic hose;

[0020] Step (2) When it is necessary to measure the rapidity of the brake pressure rising response, place the conversion switch in the "step on" position and connect the circuits of the normally open contact switch and the normally open pressure switch to the timer;

[0021] Step (3) When the pilot quickly presses the brake pedal, the normally open contact switch is closed, triggering the timer to start timing. When the brake system pressure rises to the specified pressure, the normally open pressure switch is closed, triggering the timer to stop timing, and completing the timing of the rapidity of the brake pressure rising response;

[0022] Step (4) When it is necessary to measure the rapidity of brake pressure drop, turn the changeover switch to the "release" position, and connect the normally closed contact switch and the normally closed pressure switch circuit to the timer.

[0023] Step (5) When the pilot quickly releases the brake pedal, the normally closed contact switch is closed, triggering the timer to start timing. When the brake pressure of the system drops to the specified pressure, the normally closed pressure switch is closed, triggering the timer to stop timing, completing the timing of the rapidity of the brake pressure drop response.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention can solve the inaccuracy of timing caused by manual timing of the rapidity of brake pressure response. By setting a contact switch at the pedal end as the trigger condition for starting timing and setting a pressure signal at the brake pressure end as the trigger condition for stopping timing, automatic timing of the rapidity of brake pressure response is achieved, reducing the error of manual timing and improving the accuracy of timing. Description of the Drawings

[0026] The present invention will be further described below in conjunction with the drawings and embodiments:

[0027] Figure 1 is a schematic structural diagram of the present invention.

[0028] In the figure: 1, normally open contact switch; 2, normally closed contact switch; 3, cable; 4, changeover switch; 5, timer; 6, pipe joint; 7, hydraulic hose; 8, normally closed pressure switch; 9, normally open pressure switch; 10, mounting bracket; 11, brake pedal. Detailed Embodiments

[0029] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings and embodiments.

[0030] As Figure 1 shown, an automatic timing device for the rapidity of aircraft brake pressure response mainly consists of a normally open contact switch 1, a normally closed contact switch 2, a cable 3, a changeover switch 4, a timer 5, a pipe joint 6, a hydraulic hose 7, a normally closed pressure switch 8, a normally open pressure switch 9, a mounting bracket 10, and a brake pedal 11.

[0031] The normally open contact switch 1 and the normally closed contact switch 2 are arranged on the brake pedal 11. The normally open contact switch 1 and the normally closed contact switch 2 are connected to the change-over switch 4 through a cable 3. The change-over switch 4 is connected to the timer 5 through a cable 3. The change-over switch 4 is connected to the normally closed pressure switch 8 and the normally open pressure switch 9 through a cable 3. The normally closed pressure switch 8 and the normally open pressure switch 9 are correspondingly installed on the mounting bracket 10. The normally closed pressure switch 8 and the normally open pressure switch 9 are respectively connected to the hydraulic hose 7. The hydraulic hose 7 is connected to the brake pressure inspection pipeline through a pipe joint 6.

[0032] The normally open contact switch 1 and the normally closed contact switch 2 receive the instruction of stepping on / releasing the brake pedal 11 to be used as the starting timing signal for the rapidity timing of the brake pressure response.

[0033] The normally closed pressure switch 8 and the normally open pressure switch 9 receive the brake pressure of the brake pressure inspection pipeline to be used as the ending timing signal for the rapidity timing of the brake pressure response.

[0034] The change-over switch 4 is used to switch the timing control of the rising response time of the brake pressure when stepping on the brake pedal 11 and the falling response time of the brake pressure when releasing the brake pedal 11, and receive the starting and ending timing signals.

[0035] The change-over switch 4 is provided with "step on" and "release" switching positions.

[0036] The timer 5 automatically times the brake pressure response time according to the starting and ending timing signals transmitted by the change-over switch 4.

[0037] A measuring method for an automatic timing device for the rapidity of aircraft brake pressure response, applying the above-mentioned automatic timing device for the rapidity of aircraft brake pressure response, includes the following steps:

[0038] Step (1): Connect the normally open contact switch 1 and the normally closed contact switch 2 to the change-over switch 4 through a cable 3, connect the change-over switch 4 to the timer 5, connect the normally closed pressure switch 8 and the normally open pressure switch 9 to the change-over switch 4, and connect the normally closed pressure switch 8 and the normally open pressure switch 9 to the brake pressure inspection pipeline through a pipe joint 6 and a hydraulic hose 7.

[0039] Step (2): When it is necessary to measure the rapidity of the rising response of the brake pressure, place the change-over switch 4 in the "step on" position and connect the circuits of the normally open contact switch 1 and the normally open pressure switch 9 to the timer 5.

[0040] Step (III) When the pilot quickly presses the brake pedal 11, the normally open contact switch 1 is closed, triggering the timer 5 to start timing. When the brake system pressure rises to the specified pressure, the normally open pressure switch 9 is closed, triggering the timer 5 to stop timing, thus completing the timing for the rapidity of the brake pressure rise response.

[0041] Step (IV) When it is necessary to measure the rapidity of the brake pressure drop, switch the changeover switch 4 to the "release" position, and connect the circuits of the normally closed contact switch 2 and the normally closed pressure switch 8 to the timer 5.

[0042] Step (V) When the pilot quickly releases the brake pedal 11, the normally closed contact switch 2 is closed, triggering the timer 5 to start timing. When the brake system pressure drops to the specified pressure, the normally closed pressure switch 8 is closed, triggering the timer 5 to stop timing, thus completing the timing for the rapidity of the brake pressure drop response.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic timing device for the rapidity of aircraft brake pressure response, characterized in that: It includes a brake pedal (11), a brake pressure inspection pipeline, a changeover switch (4) connected to the brake pedal (11) and the brake pressure inspection pipeline, and a timer (5) connected to the changeover switch (4); By stepping on / releasing the brake pedal (11) to serve as a starting timing signal for the rapidity timing of the brake pressure response; The brake pressure in the brake pressure inspection pipeline is used as an ending timing signal for the rapidity timing of the brake pressure response; The changeover switch (4) is used to switch the timing control of the rising response time of the brake pressure when stepping on the brake pedal (11) and the falling response time of the brake pressure when releasing the brake pedal (11), and to receive the starting and ending timing signals; The timer (5) automatically times the brake pressure response time according to the starting and ending timing signals transmitted by the changeover switch (4); A contact switch is arranged on the brake pedal (11), and the contact switch is connected to the changeover switch (4) through a cable (3); The contact switch includes a normally open contact switch (1) and a normally closed contact switch (2); The changeover switch (4) is connected to the timer (5) through a cable (3); The changeover switch (4) is provided with "step on" and "release" switching positions; 2. The automatic timing device for rapid response of aircraft brake pressure according to claim 1, characterized in that: The brake pressure inspection pipeline is connected to a pressure switch through a hydraulic hose (7) and a conduit joint (6), and the pressure switch is connected to the changeover switch (4) through a cable (3); 3. An automatic timing device for rapid response of aircraft brake pressure according to claim 2, characterized in that: The pressure switch includes a normally closed pressure switch (8) and a normally open pressure switch (9); 4. An automatic timing device for rapid response of aircraft brake pressure according to claim 3, characterized in that: The normally closed pressure switch (8) and the normally open pressure switch (9) are arranged on a mounting bracket (10); 5. A measuring method for an automatic timing device of the rapidity of an aircraft brake pressure response, characterized in that: Applying an automatic timing device for the rapidity of the aircraft brake pressure response according to any one of claims 1 to 4, includes the following steps: Step (1) Connect the normally open contact switch (1) and the normally closed contact switch (2) to the changeover switch (4) through a cable (3), connect the changeover switch (4) to the timer (5), connect the normally closed pressure switch (8) and the normally open pressure switch (9) to the changeover switch (4), and connect the normally closed pressure switch (8) and the normally open pressure switch (9) to the brake pressure inspection pipeline through a conduit joint (6) and a hydraulic hose (7); Step (2) When it is necessary to measure the rapidity of the rising brake pressure response, place the changeover switch (4) in the "step on" position, and connect the circuits of the normally open contact switch (1) and the normally open pressure switch (9) to the timer (5); Step (3) When the pilot quickly presses the brake pedal (11), the normally open contact switch (1) is closed, triggering the timer (5) to start timing. When the pressure of the brake system rises to the specified pressure, the normally open pressure switch (9) is closed, triggering the timer (5) to stop timing, and completing the timing of the rapidity of the rising brake pressure response; Step (4) When it is necessary to measure the rapidity of the falling brake pressure, place the changeover switch (4) in the "release" position, and connect the circuits of the normally closed contact switch (2) and the normally closed pressure switch (8) to the timer (5); Step (V) When the pilot quickly releases the brake pedal (11), the normally closed contact switch (2) is turned on, triggering the timer (5) to start timing. When the braking pressure of the system drops to the specified pressure, the normally closed pressure switch (8) is turned on, triggering the timer (5) to stop timing, thus completing the timing of the rapidity of the braking pressure drop response.

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