关键词: 车辆工程；加速-滑行过程；节能行驶

Abstract: In order to study the energy consumption characteristics of the vehicle in the pulse and gliding (Pulse and Gliding, PnG) operation state, the energy consumption related characteristic indexes such as the transient energy saving ΔQ(t), the unit mileage energy saving Δqs(t) and the energy saving rate η under PnG motion state were defined, taking the same distance traveled in the PnG state and uniform velocity operation state as the precondition. The energy consumption indexes under periodic symmetry and asymmetric speed regulation were simulated and analyzed by use of Matlab with different motion state parameters such as desired velocity, acceleration and velocity fluctuation amplitude. The results show that the energy consumption indexes vary with the motion state parameters under different settings. At the same desired velocity, the average transient maximum fuel saving rate measured in the test (37.30%) is smaller than the average transient maximum energy saving rate analyzed in the theory (40.75%). Therefore, the energy saving effect produced by the vehicle motion state control also needs to be guaranteed by the improvement of the energy conversion efficiency of the vehicle power unit and by the optimization of the matching working point or range of the transmission system. The above research results can provide a theoretical basis for achieving energy-efficient operation through vehicle motion state control and provide guidance for vehicle energy-efficient driving practice.

Key words: vehicle engineering; the pulse and gliding process; energy-efficient driving