Vehicle braking acceleration measuring apparatus and calculating method thereof
An acceleration and vehicle technology, which is applied in the direction of acceleration measurement using inertial force, can solve the problems of complicated calculation and difficult data acquisition, and achieve the effects of fast calculation, improved evaluation time, and simple and reliable measurement
Active Publication Date: 2012-02-15
XUZHOU XCMG MINING MACHINERY CO LTD
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Problems solved by technology
Existing formulas for evaluating braking acceleration require professional data such as vehicle mass, ground friction performance, and braking acceleration coefficient, which are difficult to obtain and complicated to calculate
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Embodiment 1
[0037] Such as figure 1 As shown, the pneumatic brake device is used to achieve stable braking, and the timing starts when the pedal reaches the braking action point, which is counted as time point A. Use the pressure sensor to monitor the air pressure, and the signal measured by the pressure sensor is transmitted to the computer through the analog signal receiver, so as to obtain the pressure change curve. After stepping on the brake pedal suddenly, record the change of the pressure of the pipeline at the inlet of the brake chamber or the wheel cylinder with time, and draw a graph of the change of pressure with time. On the curve of pressure versus time, the time when the pressure starts to change is counted as time point B, and when it reaches the steady-state value is counted as time point C, the driver’s reaction time T1 refers to psychological statistics, and the reaction time T2 of the braking system is A The time between point B and point B, the braking system active t...
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The invention discloses a vehicle braking acceleration measuring apparatus and a calculating method thereof, belonging to the braking technology field. The apparatus comprises a computer system, a pneumatic brake and a pressure sensor. According to the vehicle braking acceleration calculating method, a braking process is divided into four phases which are driver reaction, brake system reaction, brake system reaction and brake system continuous reaction. According to statistic data and the pressure transducer, through a curve map drafted by a computer, times of the four phases are obtained, according to a braking characteristic, process curves of the four phases are drafted, the process curves subjected to hypothesis and integration solution, a braking distance and a braking time are substituted into a braking distance equation, a coefficient is solved, the coefficient is substituted into an acceleration equation, and an effective maximal speed of braking is solved and obtained. The measuring apparatus and calculating method have the following advantages: data measurement in a braking process is simple and reliable, a real data curve approaching vehicle braking is obtained, operation is fast, and an assessment time of vehicle performance can be effectively raised.
Description
technical field [0001] The invention relates to a vehicle braking acceleration measuring device and a calculation method, belonging to the technical field of braking. Background technique [0002] In the existing braking system, the braking process is often complicated and changeable, and the maximum braking force and maximum braking acceleration of the motor vehicle are of great significance in the evaluation of the vehicle performance. Existing braking evaluations include braking acceleration, braking distance, braking time and braking force, with particular focus on maximum braking acceleration. Existing formulas for evaluating braking acceleration require professional data such as vehicle mass, ground friction performance, and braking acceleration coefficient, which are difficult to obtain and complicated to calculate. Contents of the invention [0003] In view of the above-mentioned problems in the prior art, the present invention provides a vehicle braking accelerat...
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IPC IPC(8): G01P15/02
Inventor 王莉莉董栓牢吕昌赵云亮王力马洪锋赵登科宋宇尧
Owner XUZHOU XCMG MINING MACHINERY CO LTD