| With the strengthening of the awareness of energy saving and emission reduction,people’s requirements for reducing the fuel consumption of automobile are also increasing,and the eco-driving assistance system with the aim of reducing fuel consumption and emissions has received more attention.During the driving of vehicle,the system can obtain real-time data from the vehicle and related sensors to calculate the optimal gear and vehicle speed,etc.,and then actively controls the vehicle or provides indications.The information indication system of eco-driving developed in this paper belongs to the eco-driving assistance systems.Based on the on-board diagnostic system(OBD),it receives running parameters from the OBD to recognize road slope and instruct the driver to switch to a more fuel-efficient gear according to the designed shift control strategy which reduces the number of shifts and fuel consumption.This article focuses on the research content of the subject in the following aspects:Firstly,learn about the current status of research on this subject at home and abroad.A large amount of literature in related fields is read,and the advantages and disadvantages have been analyzed in detail.After that,aimed at the number of shifts is high in view of the existing two-parameter shift strategy and the minimum fuel consumption shift strategy,the interval mathematical algorithm is used to optimize the minimum fuel consumption shift strategy,and thus the interval algorithm shift strategy is put forward.Then the simulation models of three shift strategies mentioned above are established in Matlab/Simulink.The simulation results based on the speed data collected show that the proposed interval algorithm shift strategy can significantly reduce the number of shifts on the basis of not increasing fuel consumption.Then,aimed at the number of shifts on sloped roads is large,a solution is proposed to reduce the number of shifts by adjusting the tolerance on the slope road which sacrifices certain fuel economy.Then,an adaptive Kalman filtering(AKF)slope recognition algorithm is proposed,which improves the classic KF algorithm that needs to know the noise characteristics of the system in advance.The simulation results show that the AKF slope recognition algorithm has effective noise adaptive ability.The slope recognition result is accurate,and it can be used for tolerance adjustment.Then,the hardware system and software system of the eco-driving indication device with the above interval algorithm shift strategy are designed.The hardware system is mainly composed of an OBD connection,a STM32 F407 development board,a display screen and a CAN analyzer.The software system is mainly composed of communication program,processing program and host computer software.Finally,road tests to verify the actual effects of the eco-driving indication device are performed on flat roads.The tests recruit two drivers.Each driver conducts the tests three times,including without indication device,under the two-parameter economic shift strategy,and under the interval algorithm shift strategy.Experiments show that the interval algorithm shift strategy can reduce the fuel consumption of the driver without significantly increasing the number of shifts. |
