Smart Tire System David Billet



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Traceability


In addition to the requirement diagrams, traceability was also performed. The traceability table that is shown in the following shows how use cases were met by the requirements developed.

Use Case

Scenario

Requirement

Description

Installation

Scenario 1

R3

The system must not require major modifications to the vehicle.

4

The sensor node must be pre-installed in the tire.

4.2

The energy scavenger might need an additional installation step.

5

The control box has to be implemented when installed.

Read conditions of roads

Scenario 2

R1

The system must provide data to the vehicle about the vehicle’s road-tire conditions.

1.4

The control box has to control the network.

4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6

The sensor node obtains and transmits the signal.

5, 5.1, 5.2, 5.3, 5.4

The control box receives and processes the signal.

Detect abnormal conditions

Scenario 3

R2

The system must suggest or implement adjustments to the vehicle to assist the driver.


1.4

The control box has to manage the various signals.

1.5, 4.5

The control box processor has to make the required calculations, determine abnormalities, and determine which vehicle adjustments to make or suggest.

2.1

The control box has to make or suggest vehicle adjustments.

Modify vehicle characteristics

Scenario 4

1.5, 4.5

The control box processor has to which vehicle adjustments to make or suggest.

2.1

The control box has to suggest or make vehicle adjustments.

Table 5: Traceability of requirements to use cases

Systems-Level Design

System Structure


Figure 15 shows a hierarchal composition and association structure diagram of the smart tire system. Recognize that the sensor pack includes all the devices that will be in the tire. Also, shown are the weight, power and frequency constraints which set limits on the weight and power. Note that power sense pack is the inductive power unit which will be implemented to power the sensor pack.

Figure 15: Smart Tire Structure Diagram



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