Simulation And Optimization Of Energy-efficient Highway Passenger Car Engine And Powertrain Parameters Match

Passenger car as a principal member of the car family, and one of the main land-based road passenger transport vehicles, it is playing an irreplaceable role in the modern transportation. Passenger car power train, as the driving force for the normal passenger traffic, its role is essential. The passenger vehicle power train of power and fuel economy has a great impact on bus power, good or bad fuel economy is depended largely by the performance of the engine and chassis parameters of power train choices. So passenger vehicle power train parameters of highway bus design have become an important part. According to statistics, the results show that most of the domestic automotive engines are of work in the area to stay away from the best fuel economy. This was mainly due to engine and power train parameters improper matching. The unreasonable match of the power train and engine performance parameters, both of them will not give full play, so that the passenger vehicle performance can not be the best. Therefore, the bus engine and its transmission system a reasonable match, give full play to the bus is the key to overall performance. Transmission line design parameters to achieve a reasonable match of the automobile engine are key automotive design components. This paper studies highway bus matching engine and transmission problems, engine and transmission in order to achieve the best match line to improve the productivity of road passenger transport, reducing fuel consumption.Papers on the highway a passenger car power train research, the use of curve fitting and surface fitting method, bus engines and engine characteristics are the characteristics of the mathematical model described. Mapping are the characteristics of three-dimensional curve, the establishment and improvement of the highway passenger car power train mathematical model, summed up the road and the bus power of the simulated fuel economy calculation. After the establishment of mathematical model, the preparation of dynamic simulation of passenger car fuel economy program and the simulation program. After the results of the calculation and comparison of test results, the correctness of the mathematical model has been verified. The matching problem for passenger cars. First analysis of automotive power train optimization optimize common matching method, the conventional method of vehicle dynamics and economic evaluation of the weighted indices as a comprehensive evaluation index, and the basic performance as a motor-driven power indicator, a row for acceleration time and six blocked conditions fuel economy is not reflected in quantitative bus power train and engine match. In this paper, the first engine to set parameters, optimization of transmission line parameters and transmission line parameters to set performance optimization engine to optimize matching of two ways, the use of optimization method to the energy efficiency of passenger cars As the countdown to the objective function to determine the design variables, the establishment of restrictive conditions, and converted into fuzzy constraint and the establishment of its function, calculated by the solution set, and then converted to fuzzy constraints common constraints, the optimal solution obtained is the bus engine performance and power train parameters of the best matching results. Fuzzy optimization more easily find the best matching program, the dynamic performance of passenger cars and buses have the economic performance must improve.