Decoupling and continuous estimation method for whole vehicle mass and road resistance of electric vehicle

A technology of vehicle quality and road resistance, applied in the field of transportation, can solve problems such as increasing the difficulty of the algorithm and the amount of calculation

Active Publication Date: 2020-03-27
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the longitudinal dynamic equation of the vehicle, the coupling problem makes the parameter estimation of the two influence each other, and also increases the difficulty and calculation amount of the algorithm

Method used

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  • Decoupling and continuous estimation method for whole vehicle mass and road resistance of electric vehicle
  • Decoupling and continuous estimation method for whole vehicle mass and road resistance of electric vehicle
  • Decoupling and continuous estimation method for whole vehicle mass and road resistance of electric vehicle

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Embodiment Construction

[0065] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0066] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be unders...

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Abstract

The embodiment of the invention provides a decoupling estimation method for the whole vehicle mass and road resistance of an electric vehicle. The method comprises the steps: carrying out the decoupling estimation of the whole vehicle mass and road resistance in a starting process, and obtaining a whole vehicle mass estimation mean value and a road resistance coefficient; and continuously estimating the road resistance coefficient in the vehicle driving process by adopting a linear full-dimensional state observer based on the whole vehicle mass estimation mean value. The invention further provides a continuous estimation method for the whole vehicle mass and the road resistance under the driving cycle working condition. The embodiment of the invention is suitable for electric vehicles withpower system driving force and braking system braking torque capable of being accurately obtained, and the electric vehicles comprise pure electric vehicles, hybrid electric vehicles with pure electric starting capacity and the like. An electric vehicle with no mass change exists in the driving process; the estimated road resistance coefficient is the resultant force of the slope resistance and the rolling resistance, and the slope resistance or the rolling resistance does not need to be estimated independently.

Description

technical field [0001] The invention relates to the field of traffic technology, in particular to a method for decoupling and continuously estimating the vehicle mass of an electric vehicle and road resistance. Background technique [0002] For electric vehicles (pure electric vehicles or hybrid electric vehicles), energy management is an important part of vehicle control. Vehicle mass and road resistance are important parameters that affect the energy management and dynamics control of electric vehicles. Only by accurately obtaining the vehicle mass and road resistance parameters can the instantaneous energy consumption of the vehicle be calculated accurately, which is one of the basic conditions for optimal control of energy management. [0003] Since the vehicle mass and road resistance cannot be directly measured, parameter estimation using various methods and algorithms is currently the main method used in the industry. For example, a method using the least squares me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W40/06B60W40/13G06F17/11G06F17/16
CPCB60W40/06B60W40/13G06F17/11G06F17/16
Inventor 陈宏伟耿聪
Owner BEIJING JIAOTONG UNIV
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