Improving Coupling Factor in Vehicle Theft Deterrent Systems Using Design for Six Sigma (DFSS)

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Improving Coupling Factor in Vehicle Theft Deterrent Systems Using Design for Six Sigma (DFSS)

Chowdhury, Subir / Taguchi, Shin

PASS‐Key III+ (PKIII+) is the second generation of transponder‐based immobilizer systems in General Motors' vehicles. It is General Motors' first cryptographic immobilizer which has proven very effective in deterring theft. The system's ability to communicate between the vehicle and transponder in the key is measured by the coupling factor. The focus of this Design for Six Sigma (DFSS) project is to understand the physics and critical design parameters involved in achieving optimal coupling factor to improve the first time quality in future designs. Achieving this objective will lead to designs robust to variances in material and packaging design and result in less testing. The process used in the past on these systems was the Design‐Test‐Fix approach. Using an orthogonal array to understand the factors critical to coupling factor was a new approach for this system. An L18 orthogonal array is utilized to assess various factors and their associated levels.