RAPID VALIDATION OF BATTERY MANAGEMENT SYSTEM WITH A DYMOLA HARDWARE-IN-THE-LOOP SIMULATION ENERGY STORAGE TEST BENCH

摘要

The paper presents a concept and an implementation of a hardware-in-the-loop (HIL) energy storage test bench. This system permits to simulate energy management strategies, battery models or thermal management in real time in combination with a real energy storage system. The entire Hybrid Electric Vehicle (HEV) behaviour is simulated on computer, such as longitudinal dynamics, internal combusting engine (IEC), electric motors or also control strategies and driver behaviour. Dymola is used as simulation tool on a normal Windows PC platform. It simulates the model code, the so called Modelica code. A software interface to a Data Acquisition (DAQ) Card provides real signal inputs and outputs from the Dymola simulation environment. An exact real time simulation is only then possible when synchronization mechanism between the simulation time and the real time reference on the DAQ-Card is implemented. With the proposed system, particularly long-time tests with sample rates up to 30 Hz can be executed very cost effective. The presented HIL system is an adequate platform for the verification and validation of battery models, thermal management models or battery management models that involve real batteries or fuel cell systems. Typical tests are for example simulations of drive cycle like the Federal Test Procedure (FTP) or the New European Drive Cycle (NEDC). In this paper a HIL simulation of a four wheel drive Hybrid Electric Vehicle is presented. This simulation integrates the longitudinal simulation of the HEV, the simulation of electric components and the Battery Management System (BMS) with a real Lithium-Ion battery in a common environment. The HIL simulation results, a part computed on an inexpensive Windows PC platform and a part measured on the HIL test bench, are shown for a full NEDC drive cycle.