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Technical Paper

Downhill Safety Assistant Driving System for Battery Electric Vehicles on Mountain Roads

2019-09-15
2019-01-2129
When driving in mountainous areas, vehicles often encounter downhill conditions. To ensure safe driving, it is necessary to control the speed of vehicles. For internal combustion engine vehicles, auxiliary brake such as engine brake can be used to alleviate the thermal load caused by the continuous braking of the friction brake. For battery electric vehicles (BEVs), regenerative braking can be used as auxiliary braking to improve brake safety. And through regenerative braking, energy can be partly converted into electrical energy and stored in accumulators (such as power batteries and supercapacitors), thus extending the mileage. However, the driver's line of sight in the mountains is limited, resulting in a certain degree of blindness in driving, so it is impossible to fully guarantee the safety and energy saving of downhill driving.
Technical Paper

Vehicle accelerator and brake pedal on-off state judgment by using speed recognition

2020-04-14
2020-01-1377
The development of intelligent transportation improves road efficiency, reduces automobile energy consumption and improves driving safety. The core of intelligent transportation is the two-way information interaction between vehicles and road environment. At present, mainly the road environment information transmits to vehicles, while the information of vehicles rarely transmits to the outside. The electronic throttle and electronic braking systems of some vehicles using sensors to get the state of the accelerator and brake pedal, which can be transmitted to the outside through technologies such as the Internet of vehicles. But, Internet of vehicles technology has not been widely used, and it relies on signal sources, which is a passive way of information acquisition. In this paper, an active identification method is proposed to get vehicle pedal on-off state also driver operation behavior through existing traffic facilities.
Technical Paper

Research on Heat Dissipation Performance of Battery Pack Based on Vertical Arrangement of Flat Plate Heat Pipes

2020-04-14
2020-01-0162
Temperature is a direct factor affecting battery performance. If the temperature of the battery is too high or the temperature difference between cells is too large, it will accelerate the degradation of battery performance, reduce the battery life, and may cause safety problems such as thermal runaway in severe cases. Efficient thermal management of batteries is important to improve battery performance and safety. The flat plate heat pipe(FPHP) has high thermal conductivity, strong isothermal performance and light weight, it’s an ideal heat dissipating component for battery thermal management. In this study, the FPHP is used as the heat conduction component of the battery pack. Firstly, the position of the FPHP with minimum thermal resistance is obtained through experiments.
Technical Paper

Research on Solar Thermal Energy Warming Diesel Engine Based on Reverse Heat Transfer of Coolant

2020-04-14
2020-01-1343
In winter, the temperature of the coldest month is below -20℃.Low temperature makes it difficult to start a diesel engine, combust sufficiently, which increases fuel consumption and pollutes the environment. The use of electric power-driven auxiliary heating system increases the battery load and power consumption. Solar thermal energy has the advantages of easy access, clean and pollution-free. The coolant in the cylinder block of the diesel engine has a large contact area with the cylinder and is evenly distributed, which can be used as a heat transfer medium for warming up. A one-dimensional heat transfer model of the diesel engine block for the reverse heat transfer of the coolant is established, and the total heat required for the warming up is calculated by an iterative method in combination with the warming target.
Technical Paper

Real-time and accurate estimation of road slope for intelligent speed planning system of commercial vehicle

2020-04-14
2020-01-0115
In the intelligent speed planning system, real-time estimation of road slope is the key to calculate slope resistance and realize the vehicles’ active safety control. However,if the road slope is measured by the sensor while the commercial vehicle is driving, the vibration of the vehicle body will affect its measurement accuracy. Therefore, the relevant algorithm is used to estimate the real-time slope of the road when the commercial vehicle is driving. At present, many domestic and foreign scholars have analyzed and tested the estimation of road slope by the least square method or kalman filter algorithm. Although the two methods both can achieve the estimation, the real-time performance and accuracy still need to be improved. In this paper, for traditional fuel commercial vehicle, the kalman filter algorithm based on the kinematics and the extended kalman filter algorithm based on the longitudinal dynamics are respectively used to estimate the road slope.
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