Control of automotive waste heat recovery systems with parallel evaporators
conference paper
In this paper, Model Predictive Control (MPC) is applied to control a Waste Heat Recovery system for a highly dynamic automotive application. As a benchmark, a commonly applied control strategy is used that consists of a feedforward based on engine conditions and of two PI controllers that individually control the post-EGR and post-exhaust evaporator temperature. By controlling the temperatures, this strategy deals with the constraints on working fluid temperature and aims to guarantee vapor state at the evaporator outlet. To design the local PI controllers, a frequency domain based loop shaping method is applied. Using a high-fidelity Waste Heat Recovery system model, the performance of the MPC and PI controller is compared in simulations over a World Harmonized Transient Cycle for both cold-start and hot-start conditions. Due to the availability of a model and knowledge of the engine disturbance, the MPC strategy is shown to outperform the reference PI controller, it gives higher energy recovery and guarantees operation within safety margins with respect to physical capabilities of the plant.
TNO Identifier
954555
Publisher
FISITA
Article nr.
F2014-CET-015
Source title
FISITA 2014 World Automotive Congress - Proceedings, 35th FISITA World Automotive Congress, 2014, 2 June 2014 through 6 June 2014
Files
To receive the publication files, please send an e-mail request to TNO Repository.