This paper aims at developing the offline Simulink model for different diagnostics algorithm for BS-VI On Board
Diagnostics (OBD). Union Government announced that it will enforce the BS-VI emission norms for automobiles by 2020.
BS-VI is having stringent norms compared to BS-IV along with a Real Driving Emission (RDE). Thus, it introduces new
methodologies based on estimators and physical modules for different subsystem interface such as Air handling, After
treatment system, filtration system etc. This is a challenging problem to develop robust diagnostics due to increase in the
number of complex electronics. It requires strong tools for the analysis of vehicle duty cycle and test cell data which will
help to decide on tuning strategy. In such scenario offline simulation tools will be very helpful and cost effective which will
help in tuning and validation process of diagnostics and features. This paper explains the offline simulation diagnostics
methodology for various BS-VI applications with virtual sensor concept instead of using an expensive physical sensor. This
helps in order to reduce the cost of the overall system as well as the tuning time in test laboratories.