# US 9,752,533 B2 · Method for monitoring a locking system

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- Number: US 9,752,533 B2
- Document ID: US9752533B2
- Status: Granted
- Kind: B2
- Application number: 15/029,434
- Filed: 2014-10-16
- Published: 2016-09-01
- Granted: 2017-09-05
- Earliest claimed: 2013-10-18
- Assignees: Snecma
- Applicants: Snecma
- Inventors: Gabriel Allut; Mohamed Bozetine; Antoine Olivier François Colin; Barbara-Ann Piquet
- Web page: https://patentgrep.com/patent/US9752533B2

## CPC

- F02K 1/766: {with blocking systems or locking devices; Arrangement of locking devices for thrust reversers}
- F02K 1/64: Reversing fan flow
- F02K 1/76: Control or regulation of thrust reversers
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)

## Abstract

A method for monitoring a locking system includes N locks, each lock being monitored by two locking sensors, each locking sensor being capable of indicating if the lock that it monitors is in a locked or unlocked state, each locking sensor being able to be in a valid or invalid status, the method including determining the state of the locking system on the basis of the state of the locks detected by the locking sensors; determining a reliability level associated with the state of the locking system on the basis of the number of valid locking sensors monitoring the locks that are in the same state as the locking system.

## Claims

### Claim 1

A method for monitoring a locking system comprising N locks, each lock being monitored by two locking sensors, each locking sensor being capable of indicating if the lock that the locking sensor monitors is in a locked or unlocked state, each locking sensor being able to be in a valid or invalid status, the method comprising:
determining a state of the locking system on the basis of the state of each of the locks detected by the locking sensors;
determining a reliability level associated with the state of the locking system on the basis of a number of valid locking sensors monitoring the locks that are in the same state as the locking system, wherein determining the state of the locking system comprises:
acquiring the status and the state of each locking sensor by a control unit;
determining an overall state and the status of each lock on the basis of the status and the state of the two locking sensors that monitor it;
determining the state of the locking system on the basis of the overall state of each lock.

### Claim 2 (depends on 1)

The method for monitoring according to claim 1, wherein only the states of locks detected by valid locking sensors are used to determine the overall state of a lock.

### Claim 3 (depends on 1)

The method for monitoring according to claim 1, wherein when the two locking sensors that monitor a same lock are invalid, an overall unlocked state is attributed to said lock.

### Claim 4 (depends on 1)

The method for monitoring according to claim 1, wherein when the two locking sensors monitoring a same lock are valid but that the two locking sensors detect different states of that lock, the two locking sensors are considered invalid and an overall unlocked state is attributed to that lock.

### Claim 5 (depends on 1)

The method for monitoring according to claim 1, further comprising determining a confidence index associated with the overall state of each lock, the confidence index being equal to a number of valid locking sensors that detect a state for the lock conforming to the overall state of the lock.

### Claim 6 (depends on 5)

The method for monitoring according to claim 5, wherein the reliability level is determined by adding together the confidence indices associated with the overall states of locks that are in the same state as a surveillance system.

### Claim 7 (depends on 1)

The method for monitoring according to claim 1, wherein the locking system is considered in a locked state when at least P locks are in an overall locked state.

### Claim 8 (depends on 1)

The method for monitoring according to claim 1, wherein the locking system is considered in an unlocked state when at least Q locks are in an overall unlocked state.

### Claim 9 (depends on 7)

The method for monitoring according to claim 7, wherein P is an integer greater than N/2.

### Claim 10 (depends on 8)

The method for monitoring according to claim 8, wherein Q is an integer greater than N/2.

### Claim 11 (depends on 1)

The method for monitoring according to claim 1, wherein the locking system is the locking system of a thrust reverser of a turbine engine.