关键词:
farming truck
transmission ratio
hope interval
optimal design
摘要:
Farming truck engine operating conditions are typically far from the optimal economic region. In this study, we selected a 5-ton farming truck as the research subject and built a digital vehicle model by using Advanced Vehicle Simulator (ADVISOR) software. We set the operating condition as CYC-NYTRUCK and used transmission ratio as a variable. The objective function was set up based on the fuel consumption, which corresponded to the transmission ratio. By adopting the optimum method of hope interval, all levels of farming truck transmission ratios can be optimized. Then, we used a different gearbox ratio with a design based on different variables, and calculated fuel consumption. Results showed that the hope interval for the optimum transmission ratio fell within the range of 30% to 40%. Within the hope interval, we reduced the variable and resigned the transmission ratio. After calculation, the corresponding transmission ratio for the least fuel consumption was obtained. Keeping the transmission ratios for the 1st and 5th gears constant, the transmission ratios for the 2nd, 3rd, and 4th gears were adjusted to 4.97, 3.11, and 1.95 respectively. The fuel consumption of the transmission ratio after optimization was reduced by 1.2 L/100 km. Furthermore, the acceleration time within 0 km/h to 80 km/h was less than 0.1 s. Overall, the optimized transmission ratios greatly improved the fuel economy and power performance of the farming truck. The research results could provide reference to parameter optimization and application of the transmission system of the farming truck.