JPH052400Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a built-in test device for aircraft electrical equipment, which enables smooth self-diagnosis of electrical equipment used in aircraft.

[Prior Art] Aircraft are equipped with various electrical devices such as generator systems. In order to prevent failures in these electrical devices, built-in test devices are installed to perform self-diagnosis at appropriate times.

FIG. 2 shows the configuration of this type of built-in test equipment applied to a generator system. In the figure, 1 is a generator. The output of the generator 1 is sent to each electrical system in the machine via a line contactor 2. Further, a control unit 3 is connected to the generator 1 to control the output voltage of the generator 1 and the like.

That is, the control unit 3 includes a control circuit 3a that detects the output voltage and controls it to be constant;
When a failure occurs in the electrical system and the output voltage suddenly drops, turn off the line contactor 2,
A protection circuit 3b that protects the generator system and a built-in test circuit 3c that diagnoses the protection circuit 3b.
The output voltage of the generator 1 is kept constant.

The built-in test circuit 3c is activated by the test start switch 4 to execute a test,
As a result, when a failure is discovered, the failure flag 5 is displayed to that effect.

In this configuration, when the pilot manually operates the start switch 4 provided on the built-in test control panel, the test is started.

That is, the built-in test circuit 3c first transmits the protection circuit output operation prohibition signal S1 to the protection circuit 3.
b, and prohibits the output of the protection circuit 3b. Next, the built-in test circuit 3c applies the pseudo fault input S2 to the detection section of the protection circuit 3b. In this case, if the protection circuit 3b operates normally, a normal diagnostic output S3 is given to the built-in test circuit 3c, and if the protection circuit 3b has a fault (including a fault at a level that cannot be detected during normal operation), The failure level diagnostic output S3 is sent to the built-in test circuit 3c. At the time of this failure, the built-in test circuit 3c turns on the failure flag 5. Maintenance personnel waiting on the ground see the display of this failure flag 5 and remove and replace the malfunctioning equipment.

[Problems to be solved by the invention] By the way, in the above-mentioned conventional built-in test equipment, the pilot presses the start switch 4.
The test was to be conducted only when the machine was operated. This resulted in inconveniences such as forgetting to carry out tests and increasing the burden of responsibility on pilots.

This idea was devised against this background;
The purpose of the present invention is to provide a built-in test device for aircraft electrical equipment that can automatically perform tests.

[Means for Solving the Problems] In order to solve the above problems, this invention provides an aircraft for use in an aircraft, which is incorporated into an in-flight electrical device and configured to start self-diagnosis of the electrical device using a start switch. The built-in testing device for electrical equipment is characterized in that a weight-on-wheel switch, which is turned on when the aircraft lands, is connected in parallel with the start switch.

[Operation] The weight-on-wheel switch is automatically turned on during landing using the weight of the aircraft's legs. Therefore, according to the above configuration, the test is automatically executed when the aircraft lands.

Generally, when performing self-diagnosis of electrical equipment onboard an aircraft, it is best to perform it during flight. However, it cannot be guaranteed that the equipment will malfunction during the test, so it is best to perform the test during landing, when it is closest to the non-operational state. According to the present invention, since the test upon landing is automatically performed, it is possible to compensate for forgetting to inspect the pilot, and to reduce the responsibility. As before, pilots can perform manual tests before flight.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of this invention. This embodiment differs from the conventional device shown in FIG. 2 in that the built-in test circuit 3c
A weight-on-wheel switch (WOW switch) 7 is connected in parallel with the start switch 4 connected to the start switch 4. This WOW switch 7 is a switch that is turned on by the weight of the aircraft when it lands.

According to the above configuration, at the same time as the aircraft lands, the weight of the legs turns on the WOW switch 7.
The built-in test circuit 3c is activated, and a self-diagnosis test is started and executed.

In addition, although the above-mentioned example explained the case where a built-in test device was applied to a generator system, it goes without saying that it can also be applied to other electric devices.

[Effects of the invention] As explained above, in this invention, the WOW switch is connected in parallel to the start switch of the built-in test device, so the built-in test is automatically started and executed when the aircraft lands. As a result, the following effects can be obtained.

A built-in test can be performed automatically when the aircraft lands to compensate for missed inspections for the next flight.

Flight conditions can be tested in the closest operating mode.

The pilot's responsibility load can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of this invention, and FIG. 2 is a block diagram showing an example of the configuration of a conventional built-in test device. 4... Start switch, 7... Weight on wheel switch.

Claims (1)

[Scope of utility model registration request] In a built-in test device for aircraft electrical equipment, which is incorporated into the onboard electrical equipment and configured to initiate a self-diagnosis of the electrical equipment by means of a start switch, in parallel with the start switch,
A built-in test device for aircraft electrical equipment, characterized by a weight-on-wheel switch that is turned on when the aircraft lands.