Method for measuring automobile exhaust braking efficiency on straight road section
A technology for automobile exhaust and braking efficiency, which is used in measurement devices, vehicle testing, and machine/structural component testing. , to ensure the effect of reasonable
Active Publication Date: 2021-08-03
DONGFENG AUTOMOBILE COMPANY
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Problems solved by technology
The above standard does not give a corresponding test method for vehicles with only exhaust brakes
Method used
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Embodiment 1
[0044] A method for measuring automobile exhaust braking efficiency, which is carried out in accordance with the following steps:
[0045] 1. See figure 1 , using the Racelogic V-BOX vehicle test system, install the GPS sensor 2 of the V-BOX test equipment 1 on the top of the cab of the commercial vehicle, and ensure its normal operation;
[0046] 2. See figure 2 , the vehicle to be tested is placed on a test section of a straight road in a fully loaded state, and the test section of a straight road is a road section with a road surface adhesion coefficient of 0.7-0.8 and a slope of any longitudinal length of 50m not greater than 1%;
[0047] 3. First, slide the vehicle to be tested with gears on a straight road test section with the exhaust brake turned off (see figure 2 ), reduce the vehicle speed from the initial value of 100km / h to 50km / h, and use the V-BOX to record the time when the vehicle speed is 100km / h, 90km / h, 80km / h, 70km / h, 60km / h, and 50km / h , and then calcul...
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A method for measuring automobile exhaust braking efficiency on a straight road section comprises the steps of firstly, enabling a to-be-measured automobile to slide on the straight road section with gears under the condition that exhaust braking is turned off and turned on, reducing the automobile speed to Vn from an initial value V1, and recording n instantaneous automobile speeds in the process, calculating the average deceleration of the time period according to any two adjacent recorded instantaneous vehicle speed values, taking the average deceleration of the time period as the instantaneous deceleration corresponding to the middle vehicle speed, and drawing a relation curve between each instantaneous deceleration and the corresponding vehicle speed, and finally, taking the mean value of the instantaneous deceleration difference between the relation curve drawn under the exhaust braking closing condition and the relation curve drawn under the exhaust braking condition as the exhaust braking efficiency of the to-be-measured automobile. According to the design, the exhaust braking performance of the automobile is effectively evaluated by measuring the exhaust braking performance, and the testing process is simple and easy to implement.
Description
technical field [0001] The invention belongs to the field of automobile production, and in particular relates to a method for measuring exhaust braking performance of automobiles on straight road sections. Background technique [0002] Commercial vehicles driving in mountainous areas and mining areas often need to continuously brake the vehicle to ensure that the vehicle speed is stable within a safe range. Long-term braking will cause thermal decay, which will affect braking performance or even brake failure, resulting in danger; emergency braking will increase fuel consumption and tire wear, increase the labor intensity of the driver, and aggravate the wear of the braking system , the service life of the vehicle is shortened, so auxiliary braking is widely used in commercial vehicles. National standards also have corresponding requirements for auxiliary braking, such as Chapter 7.5 of GB7258-2017: Buses with a length greater than 9m (for special school buses, the length F...
Claims
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IPC IPC(8): G01M17/007
CPCG01M17/007
Inventor 于根稳林文干宗磊周志明王运龙刘雪峰黎明成少波张雪琰王沛
Owner DONGFENG AUTOMOBILE COMPANY