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The introduction of more stringent emission regulatory standards, such as China 6 and Euro 6, with test cycles that are more representative of real-world driving, from WLTP to RDE presents significant challenges to the emission development of internal combustion engine program. In the typical development process, the emission development requires complex work such as after-treatment development and calibration optimizations. In addition, it is late in the process, after the prototype vehicle that is more representative of the production status is ready. To address the situation outlined above, an Engine-in-the-Loop (EIL) testing methodology is developed at SAIC Motor, to front load part of the emission development work to the engine testbed early in the development stage, in the face of ever compressed vehicle program development time. This methodology is to emulate vehicle operations on the engine testbed. Key techniques are developed to achieve this.