Slope energy-saving vehicle speed solving method considering braking

A technology of vehicle speed and slope, applied in the direction of the control device, etc., can solve the problem of incomplete consideration of the control interval, and achieve the effect of comprehensive control and efficient calculation.

Active Publication Date: 2022-01-11
JILIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for solving energy-saving vehicle speed on slopes considering braking. The optimal energy consumption of the vehicle is used as the objective function to solve the , the control rate curve of br

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  • Slope energy-saving vehicle speed solving method considering braking
  • Slope energy-saving vehicle speed solving method considering braking
  • Slope energy-saving vehicle speed solving method considering braking

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Embodiment 1

[0054] refer to figure 1 , the present invention provides a method for solving energy-saving vehicle speed on slopes considering braking, and the specific steps are as follows:

[0055]S1. Establish a vehicle energy consumption model including driving and braking conditions;

[0056] S1.1 Determine the structure form of the objective function

[0057] Taking the optimal energy consumption of the macro vehicle as the objective function, construct an objective function with unified driving and braking forms. At the same time, consider the time cost in the design of the objective function, introduce the time factor σ, and establish a time-fuel optimal control model, corresponding to The form of the objective function is:

[0058]

[0059] Among them, t 0 , t f is the beginning and end time, σ is the time factor;

[0060] S1.2 Fitting parameters in L expression

[0061] Taking a commercial vehicle as an example, through the engine test data and brake test data, the instan...

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Abstract

The invention provides a slope energy-saving vehicle speed solving method considering braking, which takes the minimum fuel consumption of a vehicle as a target cruise algorithm, takes driving and braking acting conditions into consideration, takes macroscopic vehicle energy consumption optimization as a target function, and applies a minimum value principle in an optimal control principle to deduce a slope economic cruise analysis control rate. And an equation equation set is formed by using boundary conditions and a switching discriminant, converting a boundary value problem of a differential equation into an algebraic equation set solving problem, and solving unknown parameters in the boundary value problem, so as to obtain a control rate curve under a complex working condition. A slope economic cruise control algorithm which is comprehensive in control and efficient in calculation is established, and theoretical and technical support is provided for design and development of intelligent vehicle energy-saving auxiliary driving products.

Description

technical field [0001] The invention belongs to the technical field of automobile economical cruise control, and in particular relates to a method for solving energy-saving vehicle speed on slope roads considering braking. Background technique [0002] Economic cruising on slope roads is one of the main research contents of the "new four modernizations" of automobiles. There are many research methods on economic cruising on slope roads, but most of the existing theoretical research models emphasize the influence of engine nonlinearity on economic cruising. Taking the fuel consumption of the vehicle as the objective function to study the optimization problem of cruising on slope roads, too much attention is paid to the continuous control process of the drive, there is not much room for adjustment in the control, and the role of braking control in economical cruising is ignored. In complex slope scenarios, the power to drive the vehicle forward comes from both the engine and t...

Claims

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Application Information

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IPC IPC(8): B60W30/14B60W40/105B60W50/00
CPCB60W30/143B60W40/105B60W50/00B60W2050/0019
Inventor 林楠施树明乔少锋岳柄剑陈柏安夏梦璇
Owner JILIN UNIV
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