REAL REAL-TIME OPTIMISATION FO FOR ON R ON-BOARD CONTROL -APPLICATION TO POWER POWERTRAIN ENERGY MANAG TRAIN MANAGEMENT EMENT

摘要

In Automotive applications, the increasing use of electronics and electricalmodules lead to more and more complex on-board power-train & power-net controllers inserial production cars.A real-time optimization strategy applied to the on-board combustion & electrical energyconsumption is proposed in this paper, based on automatic real-time up-dated decisionsapplied to: gear-shifts, torque delivery, and battery charge. This strategy depends on the driverrequest, on the external driving conditions, on the current running point efficiency of thepower-train, and on the electrical energy status. For this purpose, a new approach is describedin this paper, using model-based algorithms. The optimization is on-line computerized withfast ‘internal simulation’ of the global system. Kind of recursive algorithms can then providethe optimal solutions at each sample time.Three strategies are described:- a local or 'static' optimization, centered on the current running point,- a 'global' optimization related to the whole trip planning (periods of minutes or hours),- and a 'predicted' optimization on a ‘moving-time-window’ defined as the near next timeperiod of few seconds or minutes, including all the predictable large-scale, high and lowfrequencydynamics of the whole system (power-train + electrical power-net), modeled andintegrated into the on-board micro-controllers.Two main applications are described in this paper:- an optimal management of engine torque and transmission gear-shifts,- and a more robust battery diagnosis for optimization of the energy use. Some simulationsand real tests are described, which provide promising results, able to improve significantly theenergy use reduction in a vehicle.The field of applications is wide open: for automotive power-train & power-net managementas described here, as well as for many other industrial applications, as aerospace electricalcontrol, building lighting, handy phones, etc.