Model-Based Exhaust Manifold Temperature (T3) Observer for Future Diesel Engines English

  • Category Technical paper
  • Related event International Congress : SIA Powertrain - Rouen 2014 - 21 & 22 May 2014
  • Edition SIA
  • Date 05/21/2014
  • Author B. Fulton, S. Petrovic, D. Roettger, M. van Nieuwstadt - Ford
  • Language English
  • Type PDF file (949.69 Ko)
    (Downloadable immediately on receipt of online payment)
  • Number of pages 11
  • Code R-2014-02-07
  • Fee from 8.00 € to 10.00 €

Customer demands for vehicles with improved performance and fuel economy and more stringent legal emissions standards and OBD regulations have been driving the development of more advanced and complex engine control and diagnostic systems. As complexity of the control system advances, the development of model based engine controls to improve control of the physical behavior of the vehicle, engine and aftertreatment system, is becoming increasingly important.
Exhaust temperatures are some of the hardest parameters to measure and estimate due to the range of the signal and the environment which the exhaust system creates. Accurate exhaust temperature inputs in vehicle and engine control systems are important for performance, fuel economy, emissions and aftertreatment control. Most exhaust temperature (T3) modelling efforts are mass-energy based models which use open loop estimates based on other engine operating parameters to predict T3, some with methods of predicting and applying heat loss to the T3 temperature estimate. A turbine inlet exhaust temperature observer model based on isentropic expansion and heat transfer across a turbocharger turbine was developed and investigated in this paper. There are 4 main components used to model the exhaust temperature; an open loop T3 mass/energy model, an isentropic expansion across the turbine, a turbine heat transfer model and an integrator with the downstream turbine outlet temperature estimation error. The model was validated using data from two different Ford Diesel powerpacks. The goal of the project was to develop an exhaust manifold temperature model which maintains a limited complexity and calibration effort, with accuracy levels suitable for input into current engine control and diagnostic systems.

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