A method and instrument for detecting brake performance of agricultural vehicles

Abstract

The invention relates to a method for detecting the braking performance of agricultural vehicles and a detection instrument thereof. When selecting a relatively flat and straight road section as the road test section, the agricultural vehicle to be inspected is first parked in the road test section, and at one end of the road test section, it is directly opposite to the road test section. A high-frequency signal transmitter and a receiver are placed on the front or rear of the inspected agricultural vehicle. When the inspected agricultural vehicle starts driving in the same direction or in the opposite direction as the transmitter, the high-frequency signal transmitter and receiver are turned on. Continuously transmit high-frequency signals to the inspected agricultural vehicle that is running at a constant speed, braking and sliding until it stops, and the receiver receives the reflected signal from the inspected agricultural vehicle, and continuously transmits the reflected signal received by the receiver to the synchronous timing system , calculated by a computing system, and then displayed, recorded, and applied to the detection method of a farm vehicle braking performance detection instrument, the detection efficiency is high and the detection accuracy is also high.

Description

technical field [0001] The invention relates to a detection method and a detection instrument for the performance of an agricultural vehicle. Background technique [0002] The detection of agricultural vehicle performance includes braking, axle load, speed, power, etc. Among them, the quality of braking performance is a relatively key indicator, and there are more instruments and equipment in the detection of vehicle braking performance. The most common methods include the road test method and the bench method, among which the road test method is more rapid and convenient, and is widely used. According to the regulations of GB7258-1997, the road test method mainly tests the braking performance of the car on the road, and the parameters of the test are limited. fully issued average deceleration; brake pedal force; brake coordination time, etc., such as the portable small car brake force tester with a publication number of 1710393, which has a two-way booster rod, and the two-...

AI Technical Summary

Problems solved by technology

[0002] The detection of the performance of agricultural vehicles, including braking, axle load, speed, power, etc., among which the quality of braking performance is a relatively key indicator, and in In terms of vehicle braking performance testing, there are also a lot of instruments and equipment. The testing methods include road test method and bench method. Among them, the road test method is faster and more convenient, and it is widely used. According to the regulations of GB7258-1997, the road test method is mainly used on road Car braking performance is detected on the Internet, and the parameters detected have braking distance; Fully issued average deceleration; Brake pedal force; It has a two-way booster rod, which is connected with a rigid force transmission shaft. The upper end of the rigid force transmission shaft is fixed with an instrument panel, and the lower end is connected with a hub sleeve. Wide and narrow grooves are distributed on the hub sleeve. There are sliding sleeves, and the sliding sleeves are connected to the wheel hub through narrow slots by bolts through the lugs to achieve positioning at any position. The test effect is good and the application range is large. However, the positioning of the components needs to be carried out at the position of the car hub. Installation, not only increases the operation steps, but also the instability of the installation may cause excessive deviation of the test results, and some commonly used brake performance testers are mostly installed with sensors on the vehicle body, which is difficult to use and maintain, such as the announcement number 202420870U The Chinese utility model patent discloses a portable brake performance tester for automobiles, which includes a single-chip microcomputer unit and a signal detection unit. The signal detection unit provides detection signals for the single-chip microcomputer unit. The signal detection unit includes an acceleration sensor and a pedal force sensor independent of each other. And the pedal switch sensor, this kind of tester does not have any electrical and mechanical hard connection with the motor vehicle, so when the brake starts must be judged by the software according to the output of the sensor, so as to determine the data collection and storage, and facilitate data processing. However, the sensitivity of this kind of test instrument is extremely high, and the refresh rate of the acceleration sensor is not high enough, and the higher one can only reach hundreds of HZ, which means that the amount of sampled data is relatively small, and the degree of simulation is not high enough. The accuracy of the data needs to be improved. As a result, the existing test instruments have low efficiency and low test accuracy when faced with batch testing or precise testing, and when testing in the field and other places, due to many restrictions such as the environment, the actual operation There will be many problems, and it cannot meet the test of agricultural vehicles of various models in rural areas and in the field.

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