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Gao Z.H.,Jilin University | Gao Z.H.,Changan Automobile Holding Ltd 40 | Gao Z.H.,Changan Automobile Holding Ltd. | Yan W.,Jilin University | And 3 more authors.
Advanced Materials Research

A new decision algorithm for ACC systems is proposed. Feasible driving set is defined based on state and control constraints, which represent driver behavior features. And based on the analysis of collected driving data, a second-order range policy is selected to approach real driver behavior. Under dynamic output feedback control framework, the decision algorithm has been developed based on quadratic boundedness theory and given in terms of linear matrix inequalities. Performance of the proposed algorithm is verified by Simulink and Carsim co-simulation. © (2013) Trans Tech Publications, Switzerland. Source

Wang D.,Jilin University | Song X.W.,Jilin University | Song X.W.,Hunan University | Sun X.Y.,Jilin University | And 3 more authors.
Advanced Materials Research

In this paper, a finite element model of human head was established based on CT scanning on a 40-year-old and 50 percentile Chinese male volunteer, and the model was verified with the experiment conducted by Verschueren and skull fracture was investigated during the collision. The frontal of head was impacted with different velocities during the impact tests. A break-deletion element process was represented to simulate the pathological phenomena of skull fracture.The results showed that the simulation results and experimental results were in a good consistency on both mechanics and pathology. © (2014) Trans Tech Publications, Switzerland. Source

Gao Z.,Jilin University | Li C.,Jilin University | Hu H.,Jilin University | Chen C.,Wayne State University | And 2 more authors.
SAE Technical Papers

At the collision moment, a driver's lower extremity will be in different foot position, which leads to the different posture of the lower extremity with various muscle activations. These will affect the driver's injury during collision, so it is necessary to investigate further. A simulated collision scene was constructed, and 20 participants (10 male and 10 female) were recruited for the test in a driving simulator. The braking posture and muscle activation of eight major muscles of driver's lower extremity (both legs) were measured. The muscle activations in different postures were then analyzed. At the collision moment, the right leg was possible to be on the brake (male, 40%; female, 45%), in the air (male, 27.5%; female, 37.5%) or even on the accelerator (male, 25%; female, 12.5%). The left leg was on the floor all along. Muscle activation of gastrocnemius, vastus medialis and vastus lateralis of right legs of male drivers in brake pedal region were significantly larger compared to the other positions, and that of soleus and hamstrings were significantly greater compared to air region. Gluteus maximus showed small muscle activation all along (<10%). Right leg showed larger muscle activation than left leg in the air and brake pedal region for most muscles of both genders (except for gluteus maximus). The right and left legs were in different postures at the collision moment, which affects the muscle activation. Differences were also found between muscles and genders. Therefore, muscle activation should be precisely measured, and the influence of these factors should be considered in the future injury analysis of lower extremity. © 2016 SAE International. Source

Gao Z.,Jilin University | Zhang X.,Jilin University | Hu H.,Jilin University | Guo D.,Jilin University | And 2 more authors.
SAE Technical Papers

The poor low-temperature behavior of Li-ion batteries has limited its application in the field of electric vehicles and hybrid electric vehicles. Many previous studies concentrate on developing new type of electrolyte to solve this problem. However, according to recent research, the key limitation at low temperature is the low diffusivity of lithium ion in the anode electrodes. Hence, it is potential to study anode materials to improve low-temperature behavior of LIBs. ZnFe2O4 with higher theoretical capacity is low toxicity and abundance, contributing to its commercial application. Different ZnFe2O4 crystalline shapes have different particle sizes. Among them, the cubic ZnFe2O4 with smaller particle size will increase its own electronic and ionic conductance at lower temperature. In this regard, we evaluated low-temperature performance of LIBs with ZnFe2O4 cubes as anode materials at -25°C. The morphology, discharge/charge capacity, cyclic stability and electrochemical impedance of the electrode were investigated. It is found that the electrochemical behavior of ZnFe2O4 cubes at lower temperature is poor than that at ambient temperature, but is much better than that of commercial graphite. After the first low-temperature cycle, the reversible capacity of cubic ZnFe2O4 is still high to 422.2 mAh g-1 and its retention rate of the initial capacity can reach about 44.64%. And, the ZnFe2O4 cubes can keep normal charging and discharging even after 100 cycles at -25°C, which can reduce the security hazard caused by the difficulty of Li-ion intercalation. These findings in our research have certain reference value for the development of LIBs applied at lower temperature. © Copyright 2016 SAE International. Source

Gao Z.,Jilin University | Guo J.,Jilin University | Guan H.,Jilin University | Dong Y.,Changan Automobile Holding Ltd. | Qiao Y.,Changan Automobile Holding Ltd.
Advanced Materials Research

Through the analysis of vehicle dynamic and characteristic and vehicle-road environment, the ESP stability boundary can be easily determined. But from the point of the system vehicle-driver-environment, ignoring the analysis of driver operation behavior in extreme situation, it is difficult to determining the system optimization direction reasonably and improving the ESP system control quality based on the analysis of ESP system response performance and vehicle comfort performance when brkae intervening. Based on the driver's complaint analysis in ESP performance test, combing with the aim of active safety system, this paper comes up with a set of new guidelines to design and development ESP system from the point of vehicle-driver-environment system. Source

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