Drum brake braking force distribution method and system
A drum brake and braking force distribution technology, applied in the direction of brake safety system, special data processing application, geometric CAD, etc., can solve the failure that the braking performance of the braking system cannot be effectively exerted and the thermal recession of the whole vehicle is ignored. Evolution mechanism and other issues, to achieve the effect of improving the stability of vehicle braking efficiency, simple structure, and preventing rapid reduction
Pending Publication Date: 2022-02-01
CHANGAN UNIV
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Problems solved by technology
[0003] At present, in order to improve the braking safety performance of the whole vehicle, it mainly depends on the optimized design of the brake structure, the application of high-temperature resistant brake materials, and the installation of brake temperature monitoring and early warning systems. Load proportional valve adjusts the braking force distribution of heavy-duty trucks, but ignores the failure evolution mechanism of vehicle brake heat decay
Unable to effectively exert the braking performance of the braking system
Method used
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[0106] The test road section is: K25-K174 section of the Ya'an-Xichang section of the Beijing-Kunming Expressway, of which the right line: K25-K174 (Yingjing service area-Pusagang service area); left line: K174-K25 (Pusagang service area-Yingjing service district); the whole journey is 149km.
[0107] The vehicle parameters are:
[0108]
[0109] The brake friction surface temperature was carefully measured during the actual braking process of the above-mentioned vehicles. The results are as follows: figure 2 shown, from figure 2 It can be seen from the data that when the braking force distribution coefficient is not adjusted, there is a large gap between the two-axis and three-axis braking forces. The result of the braking force distribution at this time is as follows image 3 shown, from figure 2 with image 3 It can be seen that there is a large difference between the temperature rise of the two-axis and three-axis at this time. The temperature rise of the three-a...
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The invention discloses a drum brake braking force distribution method and system, and the method comprises the steps: building a braking force prediction model of a drum brake based on a temperature model of the drum brake, and building a drum brake braking force observer and a whole vehicle longitudinal dynamics simulation model according to the braking force prediction model of the drum brake; using a drum brake braking force observer for obtaining the real braking force of each shaft of the brake, achieving reasonable braking force distribution on the premise of meeting the braking strength by setting the braking force distribution coefficient boundary condition and optimizing the braking force distribution coefficient. The braking performance stability of the brake is brought into full play. The problem that partial brakes fail due to overheating, so that the braking efficiency of the whole vehicle is rapidly reduced can be effectively prevented, the stability of the braking efficiency of the whole vehicle of the drum brake vehicle is guaranteed, the probability of the heat fade phenomenon of the brake drum is reduced on the premise that the braking safety and the operation stability are guaranteed, and the braking performance of the brake is fully exerted.
Description
technical field [0001] The invention belongs to the technical field of braking control of heavy-duty trucks, and relates to a method for secondary distribution of braking force based on brake temperature to improve the stability of vehicle braking performance, in particular to a method for distributing braking force of drum brakes and system. Background technique [0002] The heat dissipation performance of drum brakes is poor. When braking frequently on long and downhill roads, it is easy to produce thermal fading, which makes the braking device invalid. Relevant experimental studies have shown that brake assembly errors or uneven structural wear lead to a rapid increase in the temperature of a certain brake or a certain axle brake, which reduces the stability of the vehicle's braking performance. Therefore, it is an effective way to suppress the rapid rise of local brake temperature, ensure the stability of vehicle braking performance and improve the safety of vehicle bra...
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IPC IPC(8): G06F30/20G06F30/15B60T17/22
CPCG06F30/20G06F30/15B60T17/22
Inventor 史培龙符凯赵轩苏彬华王彩瑞马强张子豪武鹏程
Owner CHANGAN UNIV