The struggle through the jungle of shortcuts

After I had explained 2 weeks ago here the abbreviation SoP, EoP and CoP and also in which connection these stand, I would like to take up today the suggestion of a reader of my short versions of the contributions on linkedIn and explain further terms briefly and briefly. Whereby I would like to defer the abbreviations suggested there for the next post, as I would like to clarify 3 more abbreviations today first, which are thematically closer to the last post with “CoP”,.

I would like to start with “IUC”, which is often also used as “ISC”.

IUC is the abbreviation for In-Use-Compliance, ISC for In-Service-Compliance. Behind these two abbreviations is the legal requirement to examine vehicles already in use with regard to compliance with the limit values for the individual exhaust gas components and to prove this to the approval authority.

At this point, a brief note that other emission factors and other assessment methods are used for this than, for example, for exhaust gas CoP (DF, ki, EC – oh, other abbreviations) or the homologation of exhaust gas emissions. For IUC/ISC, only the ki factors are applied.

Since there are also different requirements for the different vehicle classes (M1- M3, N1- N3, and others), I would like to limit myself here to the vehicle class M1 (colloquially “passenger car” – again an abbreviation). However, the basic requirement does not apply to M1 alone, of course.

The IUC/ISC requirement stems from the requirement for manufacturers to ensure the effectiveness of emission control devices over a 160,000km mileage. For this purpose, the manufacturer, but also the authorities (or the technical services) themselves, use vehicles from customer use for a corresponding emission measurement. The number of vehicles to be measured is based on the number of vehicles of this (approved) type sold.

IUPR, written out as: In-Use-Performance-Ratio, describes the legal requirement to demonstrate the effectiveness of the monitoring functions of the engine control/exhaust aftertreatment system. For this purpose, OBD data of the vehicles already in use are recorded and evaluated. The objective is to obtain evidence that a certain number/rate of (ECU internal) diagnostic cycles have been successfully run and completed with a positive result.

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