Optimal Design of Shift Point Strategy for DCT Based on Particle Swarm Optimization

For a vehicle equipped with DCT, the vehicle model is established according to the existing experimental data. The traditional method is used to solve the law of economic and dynamic shift, respectively. Then, the dynamic objective function and economic objective function are designed. After normalization of the two functions, the weighted combination is carried out to get the comprehensive objective function. The traditional shift law obtained in the previous paper is regarded as the limit value of variable optimization by particle swarm optimization algorithm, and the comprehensive objective function designed in this paper is solved. The shift law obtained by the three methods is integrated into Simulink model, and the dynamic and economic verification are carried out, respectively. By comparing the acceleration time of 0–100, 0–70, and 70–120 km/h, the dynamic performance of the shift point is obtained by three methods. The final test results show that the economy of the optimized shift point is improved by 1.37% and 3.17%, respectively. The power performance increased by 4.087%, 15.28%, and −10.70%, hence, achieving the desired results.

Reductive coupling synthesis of a soluble poly(9,10-anthrylene ethynylene)

A fully soluble poly(9,10-anthrylene ethynylene), poly[2,6-(2-octyldecyl)-9,10-anthrylene ethynylene] PAAE, with moderate degrees of polymerization Pn of ca. 10 is generated in a reductive, dehalogenative homocoupling scheme, starting from a 2,6-dialkylated 9,10-bis(dibromomethylene)-9,10-dihydroanthracene monomer and n-BuLi/CuCN as reducing agent. PAAE shows surprisingly broad and unstructured absorption and photoluminescence emission bands peaking at 506 nm and 611 nm, respectively, both in chloroform solution. The long absorption tail ranging into the 600-700 nm region and the large Stokes shift point to a high degree of geometrical disorder in the arrangement of the 9,10-anthrylene chromophores along the distorted polymer backbone. This disorder is borne out in the unusually strong wavelength dependence of fluorescence depolarisation, both with regards to the excitation and the emission wavelengths. Picosecond fluorescence depolarisation spectroscopy provides clear evidence for the presence of orthogonal transition dipole moments, presumably arising from the off-axis transition of the anthracene unit and the on-axis transition of the polymer backbone.

Improvement of organization of work of locomotive crews (using the example of the Petrovsky Plant – Karymskaya section of the Trans-Baikal Railway)

On the Trans-Baikal Railway, the search for appropriate areas for circulation of locomotive crews is underway. Short shoulders lead to inefficient use of locomotive crews, and long ones lead to the need to change crews at intermediate stations (without reaching the shift points). We need to develop new ways to optimize the work of locomotive crews. The article analyzes the effective shoulder lengths for compliance with the optimal values. It is established that traction shoulders are optimal, but locomotive crew service shoulders require optimization. The analysis of working hours of locomotive crews on active shoulders showed that shortage of locomotives and locomotive crews is caused by problems of exceeding the overhead time, cancellation of locomotive crews due to exceeding two hours from the moment of appearance to the moment of departure, change of locomotive crews at intermediate stations (i.e., not reaching the points of turnover or place of residence). The main causes of these problems are identified and measures aimed at solving them are proposed. It is proposed to use two variants of technology of using warm-up teams to perform operations between the arrival of a train at the shift point and the departure after all technological operations are completed, which will reduce the overhead time. The technology is considered by the example of the Karymskaya junction station. Technical and economic comparison of the options was carried out, proving their feasibility.

Experimental study on particulate control of turbo gasoline engine

This study takes light-passenger vehicles with 1.5L port fuel injection turbocharged engine as the research object, based on the WLTC test cycle about the China 6b emissions regulations, including some influence of several key technologies, such as fuel injector selection, intake VVT opening, fuel control and gear shift point matching, what can affect the particulate emissions from light-passenger vehicles. The results show that without particulate filter (GPF) technology, Using the original 4-hole fuel injector, the opened intake air VVT in catalyst light off, the optimized fuel control and gearbox shift point, the emission test results of the light-passenger vehicle can reach the development target of China 6b, what can avoid GPF blockage and regeneration problems in the market. Meanwhile, the cost of mass production and development cycle about vehicle is effectively reduced.

Research on the Shift Strategy for the Traction Vehicle with Automatic Transmission

Firstly, according to the working characteristic diagram of engine and hydraulic torque converter, the matching working point is found. On this basis, the theoretical model of gear shifting law is derived when the engine and the hydraulic torque converter work together by taking the acceleration of adjacent two gears equal as the shift point. Finally, the theoretical model is simulated, the shift pattern diagram of tractor automatic transmission is obtained and the shift pattern diagram is analyzed, and the results are of important reference value for further study of shift delay and other characteristics.

Look-ahead gear-shifting strategy on ramps for heavy trucks with automated mechanical transmission

Look-ahead information has been applied to vehicle shift systems and has led to the development of innovative changes in shifting strategies. A shifting strategy significantly influences the dynamic and economic performance of a truck. If a shift control system can predict the information of the road ahead, then the dynamic programming method can be used to obtain an optimal shift schedule, thereby achieving the best balance between the dynamic and the economic performance of a truck. Determining the weights of the economic and dynamic performance of a truck is critical in dynamic programming. Weight is related to road slope value; hence, this study uses different weights on 3%, 5%, and 10% ramp simulation experiments to investigate the relationship between fuel consumption and running time and to determine the optimum weight for different slopes. On the basis of the optimal shift schedule obtained via dynamic programming, the ramp information of the road ahead can be utilized to adjust the shift point to avoid unnecessary shifting before entering the slope and reduce shift times on a ramp. An actual truck test shows that the anthropomorphic shifting strategy proposed in this study meets driver expectations and is conducive to the ramp driving of trucks with automated manual transmission.