# US 8,543,286 B2 · Vehicle hardware integrity analysis systems and methods

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- Number: US 8,543,286 B2
- Document ID: US8543286B2
- Status: Granted
- Kind: B2
- Application number: 13/228,864
- Filed: 2011-09-09
- Published: 2012-12-27
- Granted: 2013-09-24
- Earliest claimed: 2011-06-24
- Assignees: GM Global Technology Operations LLC
- Applicants: Padma Sundaram; Dong Da
- Inventors: Padma Sundaram; Dong Da
- Web page: https://patentgrep.com/patent/US8543286B2

## CPC

- G05B 23/0248: {Causal models, e.g. fault tree; digraphs; qualitative physics}
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)

## Abstract

A method includes: receiving classification data for a hazard associated with a system of a vehicle, the classification data indicating a classification of the hazard under standard 26262 of the International Organization for Standardization (ISO); receiving fault tree data for a fault tree of the hazard; analyzing the fault tree data using a fault tree analysis (FTA) application; identifying a minimal cut-set for the hazard; retrieving standards data for the hazard based on the classification of the hazard, the standards data indicating a minimum value for minimal cut-sets under the 26262 standard; comparing a number of elements in the minimal cut-set with the minimum value; and indicating whether the minimal cut-set complies with the 26262 standard based on the comparison.

## Claims

### Claim 1

A method comprising:
receiving classification data for a hazard associated with a system of a vehicle, the classification data indicating a classification of the hazard under standard 26262 of the International Organization for Standardization (ISO);
receiving fault tree data for a fault tree of the hazard;
analyzing the fault tree data using a fault tree analysis (FTA) application;
identifying a minimal cut-set for the hazard;
retrieving standards data for the hazard based on the classification of the hazard, the standards data indicating a minimum value for minimal cut-sets under the 26262 standard;
comparing a number of elements in the minimal cut-set with the minimum value; and
indicating whether the minimal cut-set complies with the 26262 standard based on the comparison.

### Claim 2 (depends on 1)

The method of claim 1 further comprising indicating that the minimal cut-set does not comply with the 26262 standard when the number is less than the minimum value.

### Claim 3 (depends on 1)

The method of claim 1 further comprising indicating that the minimal cut-set complies with the 26262 standard when the number is greater than or equal to the minimum value.

### Claim 4 (depends on 1)

The method of claim 1 further comprising indicating whether the system complies with the 26262 standard based on the comparison.

### Claim 5 (depends on 1)

The method of claim 1 further comprising indicating that the system does not comply with the 26262 standard when the number is less than the minimum value.

### Claim 6 (depends on 1)

The method of claim 1 further comprising:
receiving a failure rate for each element of the minimal cut-set, wherein the minimal cut-set includes at least two elements;
determining a second failure rate for the minimal cut-set based on the failure rates for the at least two elements; and
determining an occurrence rate for the hazard as a function of the second failure rate.

### Claim 7 (depends on 6)

The method of claim 6 further comprising determining a probability of occurrence for the hazard based on the occurrence rate.

### Claim 8 (depends on 7)

The method of claim 7 further comprising indicating the probability of occurrence of the hazard.

### Claim 9 (depends on 7)

The method of claim 7 further comprising:
comparing the probability of occurrence of the hazard with a predetermined probability, wherein the standards data further includes the predetermined probability; and
indicating whether the system complies with the 26262 standard based on the comparison of the probability of occurrence with the predetermined probability.

### Claim 10 (depends on 9)

The method of claim 9 further comprising indicating that the system does not comply with the 26262 standard when the probability of occurrence of the hazard is greater than the predetermined probability.

### Claim 11 (depends on 6)

The method of claim 6 wherein the receiving the failure rate for each element of the minimal cut-set includes retrieving the failure rates from a tangible, computer readable storage medium.

### Claim 12 (depends on 11)

The method of claim 11 further comprising retrieving the failure rates based on types of the elements, respectively.

### Claim 13 (depends on 6)

The method of claim 6 wherein the receiving the failure rate for each element of the minimal cut-set includes receiving the failure rates from a user.

### Claim 14 (depends on 13)

The method of claim 13 further comprising selectively indicating that at least one of the failure rates was input by the user.

### Claim 15 (depends on 1)

The method of claim 1 wherein the analyzing the fault tree data using the FTA application includes analyzing the fault tree data using FaultTree+ by Isograph.