Range extender power point selection and oil-electricity conversion efficiency measurement method

Abstract

The invention discloses a range extender power point selection and oil-electricity conversion efficiency measurement method, and belongs to the technical field of extended-range electric vehicles. The method comprises the following steps: on the premise of obtaining an actually measured range extender power point selection trajectory diagram, dividing the working modes of the range extender according to the use condition of the range extender and the demand condition of a whole vehicle, subdividing the power generation intervals of the range extender, selecting the power points of the respective intervals in the range extender power point selection trajectory diagram, and selecting the power points of the power generation intervals in the range extender power point selection trajectory diagram; and the position of the power point is finely adjusted by combining the variable working condition operation requirement of the range extender and the NVH performance of the range extender, so that the smooth transition of the range extender is ensured while the operation efficiency and the NVH performance of the range extender are considered. A double-integral measurement method is provided for testing the oil-electricity conversion efficiency of a power following point, the influence of double fluctuations of the oil consumption and the generated power of the range extender on an oil-electricity conversion efficiency test result is effectively eliminated, accurate measurement of the oil-electricity conversion efficiency of the range extender is achieved, and an accurate measurement reference basis is provided for whole-vehicle calibration of an extended-range electric vehicle.

Description

technical field [0001] The invention belongs to the technical field of range-extended electric vehicles, and in particular relates to a method for selecting a power point of a range-extender and measuring its oil-to-electricity conversion efficiency. Background technique [0002] As a type of electric vehicle, the extended-range electric vehicle combines the excellent driving and environmental protection advantages of pure electric vehicles, and solves the problems of charging difficulties and mileage anxiety of pure electric vehicles. It has become a major development trend of new energy vehicles. [0003] The point selection method of the range extender in the same industry usually selects the highest efficiency point of the range extender as the power generation point under a fixed power value, without distinguishing the actual application of the vehicle, and the practicability and smoothness of operation are poor; the point selection work does not take into account the ra...

AI Technical Summary

Problems solved by technology

[0003] The point selection method of the range extender in the same industry usually selects the highest efficiency point of the range extender as the power generation point under a fixed power value, without distinguishing the actual application of the vehicle, and the practicability and smoothness of operation are poor; the point selection work does not take into account the range extender Vibration and noise effects during the operation of the engine will affect the user's driving experience

[0004] The test method of oil-to-electricity conversion efficiency usually adopts the double refueling method, that is, the fuel tank is filled up before and after the test, and the volume of the second refueling is used as the gasoline consumption in the current test, the bubbles in the fuel tank, the volatilization effect of gasoline and other interference factors It will affect the accuracy of fuel consumption measurement, and the statistical work of power generation value and fuel consumption value will not be synchronized, which will affect the accuracy of the final test result

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