阅读说明：本技术 一种飞机防滑失效刹车控制方法 (Brake control method for airplane antiskid failure ) 是由 刘泽华 于 2020-12-29 设计创作，主要内容包括：本申请提供一种飞机防滑失效刹车控制方法,所述方法包括：检测飞机当前的防滑刹车系统的工作方式,所述工作方式包括系统正常工作模式和防滑失效刹车控制模式；若飞机当前的防滑刹车系统的工作方式为防滑失效刹车控制模式,则确定采用的保护措施,所述保护措施包括限幅方式、脉冲调节方式和限幅+脉冲调节方式,所述保护措施包括利用预设系数K确定的刹车指令L和输出刹车压力P的对应关系,所述L∈[0,1]；根据确定的保护措施,对飞机防滑刹车系统进行刹车控制。(The application provides an aircraft antiskid failure brake control method, which comprises the following steps: detecting the working mode of a current antiskid braking system of the airplane, wherein the working mode comprises a system normal working mode and an antiskid failure braking control mode; if the working mode of the current antiskid brake system of the airplane is an antiskid failure brake control mode, determining adopted protective measures, wherein the protective measures comprise an amplitude limiting mode, a pulse adjusting mode and an amplitude limiting plus pulse adjusting mode, the protective measures comprise a corresponding relation between a brake instruction L determined by a preset coefficient K and an output brake pressure P, and the L belongs to [0,1 ]; and according to the determined protective measures, performing brake control on the aircraft antiskid brake system.)

1. An aircraft antiskid failure brake control method, characterized in that the method comprises:

detecting the working mode of a current antiskid braking system of the airplane, wherein the working mode comprises a system normal working mode and an antiskid failure braking control mode;

if the working mode of the current antiskid brake system of the airplane is an antiskid failure brake control mode, determining adopted protective measures, wherein the protective measures comprise an amplitude limiting mode, a pulse adjusting mode and an amplitude limiting plus pulse adjusting mode, the protective measures comprise a corresponding relation between a brake instruction L determined by a preset coefficient K and an output brake pressure P, and the L belongs to [0,1 ];

and according to the determined protective measures, performing brake control on the aircraft antiskid brake system.

2. The aircraft anti-skid failure brake control method according to claim 1, wherein if the current anti-skid brake system of the aircraft is in a system normal operation mode, the output relation between the output brake pressure P and the brake command L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 50%, P is K multiplied by L;

when L is more than 50% and less than or equal to 90%, P is 2 xKxL;

when L is more than 90% and less than or equal to 100%, P is P_maxWherein, said P_maxThe maximum braking pressure.

3. The aircraft anti-skid failure brake control method according to claim 1, wherein if the current anti-skid brake system of the aircraft is in an anti-skid failure brake control mode and the adopted protection measure is determined to be a limiting mode, the output relation between the output brake pressure P and the brake command L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 90%, P is K multiplied by L;

when L is more than 90% and less than or equal to 100%, P is 2/3P_maxWherein, said P_maxThe maximum braking pressure.

4. The aircraft anti-skid failure brake control method according to claim 1, wherein if the current anti-skid brake system of the aircraft is in an anti-skid failure brake control mode and the adopted protective measure is determined to be a pulse regulation mode, the output relation between the output brake pressure P and the brake command L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 50%, P is K multiplied by L;

when L is more than 50% and less than or equal to 90%, P is 2 xKxL, and the system controls the output braking pressure P to adopt a pulse mode;

when L is more than 90% and less than or equal to 100%, P is P_maxAnd the system controls the output brake pressure P to adopt a pulse mode, wherein, P_maxThe maximum braking pressure.

5. The aircraft anti-skid failure brake control method according to claim 1, wherein if the current anti-skid brake system of the aircraft is in an anti-skid failure brake control mode and the adopted protection measure is determined to be a limiting and pulse regulation mode, the output relation between the output brake pressure P and the brake command L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 50%, P is K multiplied by L;

when L is more than 50% and less than or equal to 90%, P is K multiplied by L, and the system controls the output brake pressure P to adopt a pulse mode;

when L is more than 90% and less than or equal to 100%, P is 2/3P_maxAnd the system controls the output brake pressure P to adopt a pulse mode.

6. An aircraft antiskid failure brake control method according to claim 4 or 5, wherein the system controls the output brake pressure P in a pulse mode, specifically:

the lower limit value of the pulse braking pressure is 1/6P_max。

7. An aircraft antiskid failure brake control method according to claim 4 or 5, wherein the system controls the output brake pressure P in a pulse mode, specifically:

the pulse width was 0.5 s.

8. The aircraft anti-skid failure brake control method as claimed in claim 1,

the range of the preset coefficient K is 0-10.

Technical Field

The invention relates to the technical field of airplane antiskid brake control systems, in particular to an antiskid failure brake control method for an airplane.

Background

The aircraft brake system is a subsystem with relatively independent functions on the aircraft, and is used for bearing static weight and dynamic impact load of the aircraft and absorbing kinetic energy of the aircraft during landing so as to realize braking and control of takeoff, landing and gliding of the aircraft. At present, an aircraft brake system is widely provided with an anti-skid control function, so that the phenomenon that a tire is dragged by a brake of an aircraft in the braking process is avoided, the tire burst of the aircraft during braking can be prevented, and the safety of braking and deceleration of the aircraft is improved.

However, the existing airplane generally has a disadvantage that after the antiskid control function of the airplane fails, the system performs normal brake pedal braking or manual emergency braking, once the antiskid function of the system fails, the tire is easily braked and exploded by using the normal pedal braking or the manual emergency braking, so that the course control and the deceleration control of the airplane are seriously influenced, and the landing safety of the airplane is influenced.

Disclosure of Invention

The purpose of the invention is: the brake control method is characterized in that after the antiskid control function of the system is invalid, the brake enters a safe mode, normal pedal brake pressure is output in a small command section according to a normal brake mode, and pressure is adjusted in a large command section according to the safe brake mode in an amplitude limiting and pulse mode, so that the brake deceleration capacity in the small command section of the normal brake is ensured, the brake is protected in the large command section, and the brake wheel is prevented from being dragged to brake and burst. The safety of the braking and the deceleration of the airplane under the condition of the antiskid control fault is improved.

The application provides an aircraft antiskid failure brake control method, which comprises the following steps:

detecting the working mode of a current antiskid braking system of the airplane, wherein the working mode comprises a system normal working mode and an antiskid failure braking control mode;

if the working mode of the current antiskid brake system of the airplane is an antiskid failure brake control mode, determining adopted protective measures, wherein the protective measures comprise an amplitude limiting mode, a pulse adjusting mode and an amplitude limiting plus pulse adjusting mode, the protective measures comprise a corresponding relation between a brake instruction L determined by a preset coefficient K and an output brake pressure P, and the L belongs to [0,1 ];

and according to the determined protective measures, performing brake control on the aircraft antiskid brake system.

Preferably, if the current operation mode of the antiskid braking system of the aircraft is the system normal operation mode, the output relationship between the output braking pressure P and the braking command L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 50%, P is K multiplied by L;

when L is more than 50% and less than or equal to 90%, P is 2 xKxL;

when L is more than 90% and less than or equal to 100%, P is P_maxWherein, said P_maxThe maximum braking pressure.

Preferably, if the current operating mode of the antiskid braking system of the aircraft is an antiskid failure braking control mode and the adopted protective measure is determined to be an amplitude limiting mode, the output relation between the output braking pressure P and the braking instruction L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 90%, P is K multiplied by L;

when L is more than 90% and less than or equal to 100%, P is 2/3P_maxWherein, said P_maxThe maximum braking pressure.

Preferably, if the current operating mode of the antiskid braking system of the aircraft is an antiskid failure braking control mode and the adopted protective measure is determined to be a pulse regulation mode, the output relation between the output braking pressure P and the braking instruction L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 50%, P is K multiplied by L;

when L is more than 50% and less than or equal to 90%, P is 2 xKxL, and the system controls the output braking pressure P to adopt a pulse mode;

when L is more than 90% and less than or equal to 100%, P is P_maxAnd the system controls the output brake pressure P to adopt a pulse mode, wherein, P_maxThe maximum braking pressure.

Preferably, if the current operating mode of the antiskid braking system of the aircraft is an antiskid failure braking control mode and the adopted protective measures are determined to be a limiting and pulse adjusting mode, the output relation between the output braking pressure P and the braking instruction L is as follows:

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 50%, P is K multiplied by L;

when L is more than 50% and less than or equal to 90%, P is K multiplied by L, and the system controls the output brake pressure P to adopt a pulse mode;

when L is more than 90% and less than or equal to 100%, P is 2/3P_maxAnd the system controls the output brake pressure P to adopt a pulse mode.

Preferably, the system controls the output brake pressure P to adopt a pulse mode, specifically:

the lower limit value of the pulse braking pressure is 1/6P_max。

Preferably, the system controls the output brake pressure P to adopt a pulse mode, specifically:

the pulse width was 0.5 s.

Preferably, the range of the preset coefficient K is 0-10.

The invention has the advantages and beneficial effects that: the brake control method is characterized in that after the antiskid control function of the system is invalid, the brake enters a safe mode, normal pedal brake pressure is output in a small command section according to a normal brake mode, and pressure is adjusted in a large command section according to the safe brake mode in an amplitude limiting and pulse mode, so that the brake deceleration capacity in the small command section of the normal brake is ensured, the brake is protected in the large command section, and the brake wheel is prevented from being dragged to brake and burst. The safety of the braking and the deceleration of the airplane under the condition of the antiskid control fault is improved.

Drawings

FIG. 1 is a schematic diagram of a brake control method for aircraft antiskid failure according to the present disclosure;

FIG. 2 is a schematic diagram of a first protection measure provided by the present application

Fig. 3 is a schematic diagram of a second protection measure provided by the present application.

Detailed Description

Example one

The technical scheme includes that the brake control method for the airplane anti-skid failure is characterized in that when an anti-skid brake system is in a normal state, the normal brake pressure of the system and a brake command are in a piecewise linear relation, the brake pressure change is relatively stable in a small brake command section, and when the brake command exceeds 50%, the brake pressure change slope is increased.

After the antiskid control of the system fails, the system adopts two measures to carry out safety protection,

1) the first measure is as follows: after the antiskid control of the system fails, the change slope of the braking pressure of the small braking instruction section of the system (namely the relation between the braking pressure and the braking instruction of the small braking instruction section) is kept unchanged, thus, the braking capability of the airplane in the small brake command section is not reduced, and after the antiskid control of the airplane fails, the deceleration capacity of the small brake instruction is not reduced, the system safety is improved, and simultaneously, in the large brake instruction section, compared with the normal working condition of the antiskid control system, the change slope of the brake pressure is reduced, the maximum output brake pressure is reduced (the maximum output pressure is limited and is called as the limited brake pressure) when the system outputs the maximum brake instruction, the situation of brake burst is not easy to occur when the system outputs a larger brake instruction when a pilot deeply steps on a pedal under the condition of antiskid control failure, and the use safety of the system is improved;

2) and step two: after the antiskid control of the system fails, the change slope of the braking pressure of a small braking instruction section of the system (namely the relation between the braking pressure and the braking instruction of the small braking instruction section) is kept unchanged, the situation is the same as the first measure, but under the situation of a large braking instruction, another braking pressure limiting protection measure is carried out. When the system output pressure is operating as a protective measure, the system pulse pressure regulation is disabled at the beginning of the protective brake pressure. Therefore, the use safety of the system is improved, the tire cannot be braked and burst, the lowest brake pressure reduction value can be prevented, the braking efficiency of the system is insufficient, and the brake pressure is not protected (under the protection of the brake pressure) when the protection is not needed, so that the braking efficiency is improved.

Example two

The invention is described in detail below with reference to the accompanying drawings.

As shown in figure 1, the method for controlling the antiskid failure brake of the airplane is characterized in that when an antiskid brake system is in a normal state, the normal brake pressure of the system and a brake command are in a piecewise linear relation, the brake pressure changes relatively stably in a small brake command section,

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0, which prevents the pilot from unconsciously putting the foot on the brake pedal or generating a braking command due to the dead weight of the foot.

When L is more than 10% and less than or equal to 50%, P is KxL

When L is more than 50% and less than or equal to 90%, P is 2 XKXL

When L is more than 90% and less than or equal to 100%, P is P_maxAnd the constant value is kept, so that the situation that the sensor cannot reach 100% output signals due to installation of a braking command sensor, deformation of a pedal mechanism, output errors of the sensor and the like is prevented, and the system cannot output the braking command sensor according to the originally preset maximum braking pressure.

Wherein P is output brake pressure, K is a coefficient, L is a brake command, and L belongs to [0,1 ].

After the antiskid control of the system fails, the system adopts two measures for safety protection, and the first protection measure of the invention is shown in figure 2, and the specific implementation process is as follows:

after the antiskid control of the system fails, the output characteristic of the braking pressure of the system is as follows,

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0;

when L is more than 10% and less than or equal to 90%, P is K multiplied by L;

when L is more than 90% and less than or equal to 100%, P is 2/3P_max；

Under the condition, when the L is more than or equal to 0 and less than or equal to 50 percent, the system control mode is always the same as the normal state, when the L is more than 50 percent and less than or equal to 100 percent, the output brake pressure is reduced under the corresponding same brake instruction condition, and under the condition of a full instruction (L is 100 percent), the system brake pressure is only 2/3 originally, so that the condition that the tire is braked and exploded due to overlarge brake instruction of the system under the condition of the failure of the antiskid system is ensured.

The second protection measure of the present invention is shown in fig. 3, and the specific implementation process is as follows:

after the antiskid control of the system fails, the output characteristic of the braking pressure of the system is as follows,

when L is more than or equal to 0 and less than or equal to 10 percent, P is 0 (the same as the control mode of the protection measure I);

when L is more than 10% and less than or equal to 50%, P is K multiplied by L (the same control mode as the protection measure I);

when L is more than 50% and less than or equal to 90%, P is K multiplied by L, in this case, the system controls the braking pressure output to adopt a pulse mode, the pulse width is 0.5s, and the lower limit value of the pulse braking pressure is 1/6P_max(this pressure value is defined as the safety brake pressure);

when L is more than 90% and less than or equal to 100%, P is 2/3P_maxIn this case, the system controls the brake pressure output in a pulse mode, the pulse width is 0.5s, and the lower limit value of the pulse brake pressure is 1/6P_max。

In the implementation process, if the antiskid control of the airplane fails, the first brake protection control measure and the second protection measure can be implemented simultaneously, and under the condition that one measure fails, only the other protection measure can be implemented.

Therefore, the brake command of the aircraft can be guaranteed not to be kept under a relatively large brake pressure value for a long time even if a pilot steps on a pedal again, even if the brake aircraft wheel is instantaneously locked, the aircraft wheel can be restarted due to the adoption of a pulse pressure control mode in control and the release and pressure reduction process, and the aircraft wheel cannot be locked for a long time.

The invention relates to an antiskid failure brake control method of an airplane.A system adopts a sectional brake pressure control mode under normal conditions, so that when a small brake instruction is ensured, the brake pressure output by the system is smaller, and under the condition of a larger brake instruction, the brake pressure output by the system can be increased sharply, thereby improving the operating characteristics of the system; after the antiskid control function of the system is failed, the brake enters a safe mode, normal pedal brake pressure is output in a small command section according to a normal brake mode, and pressure is adjusted in a large command section according to the safe brake mode in an amplitude limiting and pulse mode, so that the brake deceleration capacity in the small command section of the normal brake is ensured, the brake protection in the large command section is ensured, the brake wheel is prevented from dragging the tire, and the tire is prevented from being burst. The safety of the braking and the deceleration of the airplane under the condition of the antiskid control fault is improved.