Calculation method of vacuum degree in car braking process

A calculation method and braking process technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem that the braking system is difficult to match reasonably, the braking performance of the vehicle cannot be effectively optimized, and the design selection cannot be effectively provided. Technical support and other issues to achieve the effect of reasonable vehicle braking performance and better performance

Active Publication Date: 2016-03-16
ZHENGZHOU BIKE NEW ENERGY AUTOMOBILE
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Problems solved by technology

[0003] The present invention aims at the problem that there is no systematic calculation of the vacuum degree of the brake servo system in the prior art. In the normal driving braking process, the vehicle braking performance cannot be effectively optimized and it is difficult to reasonably match the braking system in the early stage of development. At the same time, the design and selection of key components such as vacuum tanks, vacuum pumps, and vacuum boosters in the vehicle vacuum servo system cannot provide technical support effectively, and a calculation method for the vacuum degree in the braking process of a car is proposed

Method used

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  • Calculation method of vacuum degree in car braking process
  • Calculation method of vacuum degree in car braking process
  • Calculation method of vacuum degree in car braking process

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Embodiment 1

[0035] Example 1: Combining Figure 1-Figure 2 , a calculation method of the degree of vacuum in the braking process of a car, the calculation method is based on the vacuum servo system of the car, and the steps of the calculation method are:

[0036] Step 1: Determine the various parameters of the vacuum servo system in two states; the specific method is as follows: Assume that when the vacuum servo system is in a natural state, the volume of the vacuum booster rear chamber is V 1 , the volume of the front cavity of the vacuum booster is V 2 , the volume of the vacuum tank is V 3 ; Assume that when the vacuum booster is in the maximum stroke state, the volume of the vacuum booster rear cavity will increase, set as V 0 , the maximum stroke of the input push rod is s, the effective diameter of the booster diaphragm of the vacuum booster is d, and the vacuum degree of the system that the electronic vacuum pump can provide is p s -101x10 3 , the pressure in the front chamber ...

Embodiment 2

[0061] Example 2, combined with Figure 1-Figure 2 , the principle and calculation of vacuum degree calculation: vacuum degree is the value that the pressure in a certain volume is lower than the local atmospheric pressure, usually a negative value, and the unit is Pascal, Pa; vacuum degree is a new expression form of atmospheric pressure; The vacuum servo system uses two airtight chambers, one is standard atmospheric pressure and the other is atmospheric pressure with a certain degree of vacuum. The two chambers share one chamber wall, and an effect will be produced on the chamber wall due to different pressures. Force, we use this force to provide boost to the braking system, this force can be called vacuum boost.

[0062] According to Avogadro's gas pressure formula, the same air temperature and the same air volume, the atmospheric pressure and the number of air molecules have a linear relationship, and we can use this relationship to obtain the vacuum degree of the vacuum ...

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Abstract

The present invention belongs to the technical field of car braking systems, and relates to a calculation method of a vacuum degree in a car braking process. The method is based on a car vacuum servo system. The calculation method comprises the steps of: step 1: determining parameters of the vacuum servo system in a braking state and in a non-braking state; step 2: expressing an vacuum degree loss value of a back chamber of an vacuum booster by using an air molecular number; and step 3: according to a formula (1) pV=nRT, the formula (2) shown in the specification and the formula (3) pi=p-p0, calculating the vacuum degree of the servo system. According to the theoretical calculation of the vacuum degree in the car braking process provided by the present invention, by analyzing the structure of the vacuum booster and applying the Avogadro gas pressure formula to calculation, the vacuum degree in different braking states of the braking system can be obtained, so that the braking performance of a vehicle can be assessed via related theoretical calculation; and by calculating the vacuum degree of the vacuum servo system, optimal matching on the vehicle braking system can be performed, so as to make the vehicle braking performance more reasonable, and the performance of the vacuum servo system better.

Description

technical field [0001] The invention belongs to the technical field of car braking systems, and in particular relates to a method for calculating the vacuum degree in the car braking process. Background technique [0002] In the car brake system with hydraulic brake system, the vacuum servo device is an important part of the control device in the brake system; the performance of the vacuum servo system directly affects the braking performance of the vehicle; at present, there is no system for braking in China. The calculation of the vacuum degree of the servo system, in the normal driving braking process, the braking performance of the vehicle cannot be effectively optimized, especially for new energy vehicles powered by electric energy, the braking performance of the vehicle can only be calibrated through tests, in It is difficult to match reasonably in the early stage of development. There are problems that the braking performance of different braking states of the vehicl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 郭志明杜景义李红海王勇王轩张雨
Owner ZHENGZHOU BIKE NEW ENERGY AUTOMOBILE
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