EMA Global Engineering develops electronic control units and control logics for HVAC applications in the automotive field, with the aim of achieving the best performance in terms of air conditioning and comfort for vehicle users. We offer multi-physics modelling and analysis services in Matlab/Simulink for Automotive customers: car-makers or TIER1 suppliers of HVAC systems and subsystems who need to improve their products.
In the past, evaluating and fine-tuning the performance of HVAC system relied on engineers’ experience and required long test sessions in the car, repeating continuous cycles of testing and recalibration until the desired result was achieved. A calibration defined for a particular environmental condition outside the vehicle could be unsuitable in other conditions, requiring constant re-evaluation of the work done or accepting comfort compromises.
Testing an HVAC system implies several complications: firstly, the difficulty of keeping under control the initial conditions of the system and the external environmental conditions, such as temperature and heat sources used, as well as checking the correct timing of the various system controls. Furthermore, even for small vehicles, the thermal inertia of the air requires a lot of time to bring the system to the required temperature; also, the heating of the car components themselves (such as the engine) affects the boundary conditions and the repeatability of the tests. Finally, the impossibility of assessing the effectiveness of some architectural and calibration solutions requires repeating the same tests many times until the optimum result for the system is obtained.
Time and costs for this workflow were therefore very high.