Validation of Control-oriented Heavy Duty Diesel Engine Models for Non-Standard Ambient Conditions 2019-01-0196
Complying to the both the increasingly stringent pollutant emission as well as (future) GHG emission legislation – with increased focus on in-use real world emissions - puts a great challenge to the engine/aftertreatment control development process. Control system complexity and calibration and validation effort has increased dramatically over the past decade – a trend that is likely to continue considering the next steps in emission and GHG emission legislation. Control-oriented engine models are valuable tools for efficient development of engine monitoring and control systems. Furthermore, these (predictive) engine models are more and more used as part of control algorithms to ensure legislation compliant and optimized performance over the system lifetime. For such engine models it is essential that simulation and prediction of system variables during non-nominal engine operation, such as non-standard ambient conditions, is well captured.
This paper presents the validation of both a semi-empirical and a physics-based control-oriented virtual diesel engine for non-standard ambient conditions. Engine measurements on a Heavy Duty Diesel engine for long haulage application are performed using TNO’s Climate Altitude Chamber in which ambient conditions are varied ranging from -15oC to + 30oC and ambient pressure ranging from 990 mbar (sea level) to 710 mbar (2500m altitude). Both steady-state and transient engine operation, using both type approval and real world duty cycles, is considered. For the mentioned range of ambient conditions, both engine models are validated for key performance indicators such as manifold conditions, engine-out temperature, fuel consumption (CO2 emissions) and NOx emissions. Additionally, the physics-based engine model, containing an in-cylinder crank-angle based combustion model, is also validated on key combustion diagnostic variables such as CA50, maximum in-cylinder pressure and maximum in-cylinder pressure rise rate. The paper will end with a brief overview of possible (future) applications of the validated engine models and outlook to future work.