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Online synchronous identification method for heavy truck air resistance composite coefficient and mass

A technology of air resistance and composite coefficient, applied in the field of online synchronous identification of air resistance composite coefficient and mass of heavy-duty vehicles, can solve problems such as inability to adapt to variable characteristics, inability to achieve simultaneous online identification of multiple important parameters, etc., to improve performance Effect

Active Publication Date: 2015-10-14
JILIN UNIV
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AI Technical Summary

Problems solved by technology

However, in the field of heavy vehicles, there is currently no technology that can realize simultaneous online identification of multiple important parameters
The air resistance coefficient used in the existing heavy-duty vehicle control system is obtained through off-line experimental methods (sliding test or wind tunnel test), which cannot adapt to the variable characteristics of this parameter under different loading types

Method used

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  • Online synchronous identification method for heavy truck air resistance composite coefficient and mass
  • Online synchronous identification method for heavy truck air resistance composite coefficient and mass
  • Online synchronous identification method for heavy truck air resistance composite coefficient and mass

Examples

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Embodiment 1

[0041] refer to figure 1 , an online synchronous identification method for the combined air resistance coefficient and mass of heavy-duty vehicles is an identification model for the combined air resistance coefficient and vehicle mass established based on CAN bus information and vehicle longitudinal acceleration information, including the following steps:

[0042] Step S1: Synchronously collect the vehicle speed provided by the CAN bus, the engine drive torque, the engine speed and the acceleration a provided by the longitudinal acceleration sensor when the vehicle is running sen and other driving data and vehicle parameters;

[0043] Step S2: According to the longitudinal force balance equation of the vehicle, calculate the driving force at the wheel, that is, F res =F t -F jw -F jf

[0044] In the formula: F res is the driving force directly used by the wheel to drive the vehicle forward; F t driving force for the car f jw acceleration resistance for the wheels f...

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Abstract

The invention discloses an online synchronous identification method for the heavy truck air resistance composite coefficient and mass. An online identification model under the drive and neutral gear sliding work condition is established through a differential driving equation, and combined online identification of the air resistance composite coefficient and the whole truck mass is achieved through a recursion two-parameter least squares algorithm. The influence of the rolling resistance calculation error on the identification precision can be eliminated by selecting the differential driving equation. Synchronous online two-parameter identification has the characteristic of self-adaptation changeable air resistance, and the obtained mass identification result is not affected by the air resistance coefficient or the truck windward area error. The stable and reliable air resistance composite coefficient and truck mass can be obtained under different carrying modes and different masses and under wind speed changes and other various complex work condition environments.

Description

technical field [0001] The invention relates to an online identification method of air resistance and vehicle mass in automatic control technology of automobiles, in particular to a combined online identification method of air resistance synthesis coefficient and mass of heavy vehicles. Background technique [0002] Air resistance and vehicle mass are important parameters for vehicle operation economy and power control, and have an important impact on shift schedule and engine control. With the development of automatic control technology, some high-end vehicles and some vehicle control parameters can be identified online. However, in the field of heavy-duty vehicles, there is currently no technology that can realize simultaneous online identification of multiple important parameters. The air resistance coefficient used in the existing heavy-duty vehicle control system must be obtained by off-line test (sliding test or wind tunnel test), which cannot adapt to the variable ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W40/13B60W40/10
CPCB60W40/1005B60W40/13B60W2300/125
Inventor 施树明林楠马力
Owner JILIN UNIV
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