Method for controlling fuel consumption of passenger vehicle

Abstract

The invention belongs to the field of design and research of passenger vehicle power systems, and particularly relates to a method for controlling the fuel consumption of a passenger vehicle. The method comprises the following steps: determining the speed ratio constraint condition of a gearbox; setting the initial speed ratio of the gearbox; determining a uniform speed which is frequently used of the passenger vehicle in a normal driving process; calculating the rotating speed and the torque of an engine under a common working condition; judging whether working condition points are positioned in a fuel consumption economical area or not, if not, drawing a equipower line on a fuel consumption contour map of the engine, translating the working condition points along the equipower line till each working condition point enters the fuel consumption economical area, reading the rotating speed and the torque of each translated working condition point on the fuel consumption contour map of the engine; calculating the optimized speed ratio of the gearbox; comparing the speed ratio of the gearbox with the speed ratio constraint condition, wherein if the constraint condition is satisfied, the fuel consumption is optimal. In combination with an NEDC (New European Driving Cycle), a working condition having greatest contribution to the fuel consumption is found in a vehicle driving process, and the fuel consumption under the working condition is optimized, so that the fuel saving performance of the whole vehicle is enhanced. On a perfect theoretical basis, the fuel consumption of the vehicle is optimized, so that the power performance of the whole vehicle is not influenced in an optimization process.

Description

technical field [0001] The invention belongs to the field of design and research of a power system of a passenger car, and in particular relates to a fuel consumption control method of a passenger car. Background technique [0002] The global climate warming and environmental degradation, the increasing shortage of oil resources, and the increase in car ownership and production and sales have made energy conservation and environmental protection the consensus of the country, car companies, and consumers. Judging from the current situation of my country's oil exploration and development, it is a foregone conclusion that oil production will increasingly fail to meet domestic demand in the absence of major breakthroughs in newly proven reserves. The fuel consumption test cycle of passenger cars in the Chinese market adopts the NEDC cycle. The so-called NEDC is the abbreviation of New European Driving Cycle. This cycle simulates the normal operation process of the driver under n...

AI Technical Summary

Problems solved by technology

Judging from the current situation of oil exploration and development in my country, it is a foregone conclusion that oil production will be increasingly unable to meet domestic demand in the absence of major breakthroughs in newly proven reserves

Images