1994-03-01

Passenger Car Exhaust Emission Auditing in Production 940489

Given the legal requirements for quality assurance of passenger car exhaust emissions worldwide we define our quality assurance system and present the emission laboratories of the Mercedes-Benz assembly plants Sindelfingen and Bremen. We developed a hierarchically structured, multi-level computer system, which enables us to automize emission test procedures, calibration, maintenance of measurement systems and documentation of exhaust data.Test cell computers coordinate the different components of the test cells and perform maintenance and calibration of measurement devices, thus guaranteeing a high measurement quality with reasonable economy.The coordinating level computer, the emission host system (EHS), processes test parameters, controls and supervises the test sequences and evaluates the test results on a statistical basis. This ensures that all legally required test sequences worldwide are adhered to and allows us to recognize changes in exhaust emission quality and thus react to any changes quickly.The test results are stored in a data-documentation-system, where data cannot be deleted or changed without leaving traces and all previous data being shown. This data is evaluated in many ways by Research & Development, Mercedes-Benz Headquarters and Production thus forming a basis of quality control loops for further exhaust emission improvements.All in all, with this integrated computer system we achieve highly reliable measurements and high conformity to legal requirements while reasonable economy is also ensured.

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