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Temperature rise prediction method for long downgrade driving brake for lorry

A prediction method and brake technology, applied in the direction of temperature control using electric methods, auxiliary controllers with auxiliary heating devices, etc., can solve problems such as brake failure

Inactive Publication Date: 2016-03-30
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature exceeds 600°C, brake failure may occur

Method used

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  • Temperature rise prediction method for long downgrade driving brake for lorry
  • Temperature rise prediction method for long downgrade driving brake for lorry
  • Temperature rise prediction method for long downgrade driving brake for lorry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] The object of this embodiment is Dongfeng Tianlong DFL4251A9 tractor, CSQ9401GYY tank type semi-trailer 3rd shaft brake. During the entire braking process, the transmission is placed in neutral and only the service brake is applied. Selected initial conditions: the ambient temperature of the brake drum is 23°C, and the steady vehicle speed is 44.23km / h. Record the brake drum temperature, and then compare the established brake heating model with the test results. The data of the brake heating test results and model simulation results are shown in Table 3.

[0102] Table 3 Comparison of the results of the third axis test and model simulation results of the first ramp test of the brake temperature rise

[0103]

[0104]

[0105] The whole test process lasted 311.13s. During the test, the brake temperature rose from 22.93°C to 44.07°C. The model simulation results showed that the brake temperature rose to 42.98°C, with a relative error of 2.48%. The test data is sa...

Embodiment 2

[0107] The objects of this embodiment are the same as those in Embodiment 1. Selected initial conditions: the ambient temperature of the brake drum is 55°C, and the steady vehicle speed is 44.39km / h. Record the brake drum temperature, and then compare the established brake heating model with the test results. The data of the brake heating test results and model simulation results are shown in Table 4.

[0108] Table 4 Comparison of the third axis test results and model simulation results of the second ramp test brake temperature

[0109]

[0110] The whole test process lasted 340s. During the test, the brake temperature rose from 56.73°C to 83.20°C. The model simulation results showed that the brake temperature rose to 84.77°C, with a relative error of -1.89%. The test data is sampled every 10s, and the test results are compared with the model simulation results. The maximum relative error is 4.52%. The results are as follows Figure 5 shown.

Embodiment 3

[0112] The objects of this embodiment are the same as those in Embodiment 1. Selected initial conditions: Continuous ramp tests on five sections of road with different slopes, among which, the first section has a slope of 2.90%, a stable speed of 47.88km / h, and a driving distance of 307.90m; the second section has a slope of 4.50% , the stable vehicle speed is 47.76km / h, and the driving distance is 508.64m; the third section has a slope of 2.58%, the stable vehicle speed is 47.42km / h, and the driving distance is 505.68m; the fourth section has a slope of 2.72%, and the stable vehicle speed is 45.17km / h , the driving distance is 381.58m; the slope of the fifth section is 2.02%, the stable speed is 38.19km / h, and the driving distance is 574.00m. The data of the brake heating test results and model simulation results are shown in Table 5.

[0113] Table 5 The comparison between the test results of the third axis and the simulation results of the model for long downhill slopes wi...

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Abstract

The invention discloses a temperature rise prediction method for a long downgrade driving brake for a lorry. Based on the theory for temperature rise and temperature drop of a level road driving brake for a lorry, the temperature rise prediction method for a long downgrade driving brake for a lorry establishes a mathematic model based on a temperature rise process of a level road driving brake and a mathematic model based on a temperature drop process of the level road driving brake, and can conveniently and quickly calculate temperature rise for the brake when a lorry brakes during the driving process at one speed and one gradient, and can predict temperature rise for the brake for braking by grades, and also can predict temperature rise for the brake for continuous braking. The temperature rise prediction method for a long downgrade driving brake for a lorry has the advantages of being high in prediction accuracy, reducing the test cost and being easy to carry out, and can provide a test summary and a theoretical basis for road design and for the ramp line style design aspect for construction departments and can provide an important theoretical foundation for improvement of automobile driving safety performance.

Description

【Technical field】 [0001] The invention belongs to the field of prediction of vehicle operating conditions, and in particular relates to a method for predicting the temperature rise of a truck's long downhill brake. 【Background technique】 [0002] my country is a mountainous country, and the area of ​​mountainous areas accounts for 2 / 3 of the country's area. Mountainous roads account for a relatively large proportion of China's road network, and most of them are built according to natural and geographical conditions, and many of them are built in mountains and hills. Restricted by terrain, geology and other conditions, 5% to 8% of the slopes account for a relatively large proportion. These slopes are as short as several kilometers and as long as tens of kilometers. With the increase in the mileage of mountain roads and the number of motor vehicles, road traffic accidents are also increasing year by year, especially serious traffic accidents involving heavy trucks. [0003] W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/30
CPCG05D23/30
Inventor 赵轩余强史培龙袁晓磊杨佩钊
Owner CHANGAN UNIV
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