POWER TRAIN SYSTEM

To determine an optimum control input value minimizing fuel consumption, and to appropriately determine a control input value even when charging or discharging is performed between a vehicle and external equipment during a control stop period, without requiring the prediction of a vehicle speed and vehicle driving torque in the future.SOLUTION: A control device provided in a power train system executes control input determination processing and system control processing. The control input determination processing includes: adjoint variable determination processing to update an adjoint variable p of an optimization problem in each time step; and control input calculation processing. The adjoint variable determination processing includes initial value determination processing to determine the sum of the basic value of the initial value of the adjoint variable p and an external charging/discharging correction value as the initial value. The basic value is the final value or the average value of the adjoint variable p during a control period at the last time. The external charging/discharging correction value is determined on the basis of the amount of external charging/discharging obtained by subtracting a charging rate SOC at the end of the control period at the last time from the charging rate SOC at the start of the control period at this time.SELECTED DRAWING: Figure 1 【課題】将来の車速及び車両駆動トルクの予測を必要とせずに、燃料消費量を最小にする最適な制御入力値を決定し、かつ、制御停止期間中に外部機器との間で充電又は放電がなされた場合であっても制御入力値を適切に決定する。【解決手段】パワートレーンシステムが備える制御装置は、制御入力決定処理とシステム制御処理とを実行する。制御入力決定処理は、最適化問題の随伴変数ｐを時間ステップ毎に更新する随伴変数決定処理と、制御入力算出処理とを含む。随伴変数決定処理は、随伴変数ｐの初期値の基本値と外部充放電補正値との和を前記初期値とする初期値決定処理を含む。基本値は、前回の制御期間中の随伴変数ｐの最終値又は平均値である。外部充放電補正値は、今回の前記制御期間の開始時の充電率ＳＯＣから前回の制御期間の終了時の充電率ＳＯＣを引いて得られる外部充放電量に基づいて決定される。【選択図】図１