CN-121994503-A - Method for reproducing and simulating road PEMS test

Abstract

The invention discloses a method for reproducing and simulating road PEMS test, which relates to a PEMS test of a vehicle, and comprises the steps of installing PEMS equipment on a hub bracket; the method comprises the steps of acquiring data acquired by a PEMS test of a detection center, converting the data acquired by the PEMS test of the detection center into test data suitable for a hub rack, drawing a test curve according to the test data, guiding the test curve into a hub rack control console computer, detecting a vehicle to be tested before the test and driving the vehicle to be tested onto the hub rack, carrying out hub rack test of the PEMS test on the vehicle to be tested according to the test curve, and processing, analyzing and exporting results and reports the PEMS test data after the test is completed. The invention realizes accurate and effective PEMS bottoming test before the vehicle road PEMS authentication test, saves the authentication cost and time of automobile manufacturers and helps the automobile manufacturers to quickly occupy the market.

Inventors

• SU ZHIWEI
• QIN ZHENG
• ZHU WEIDONG
• LUO CHAOFA
• ZHANG BO
• MAO XIANGDANG
• LIU HAICHAO
• ZHU FANGHAO

Assignees

• 广西玉柴机器股份有限公司

Dates

Publication Date

20260508

Application Date

20251231

Claims (6)

1. 1. A method of reproducing and simulating road PEMS tests, the method comprising the steps of: step one, installing PEMS equipment on a rotating hub rack; Step two, acquiring data acquired by a PEMS test of a detection center; Step three, converting the data collected by the PEMS test of the detection center into test data suitable for a rotating hub rack; drawing a test curve according to the test data; step five, the test curve is led into a hub rack console computer; step six, detecting the vehicle to be tested before the test, and driving the vehicle to be tested on the hub rack; Step seven, carrying out a hub bench test of PEMS test on the vehicle to be tested according to the test curve; And step eight, after the test is completed, processing, analyzing and exporting a result and reporting PEMS test data.
2. 2. The method of reproducing and simulating road PEMS according to claim 1, wherein said data collected by said test center PEMS includes altitude and vehicle speed data.
3. 3. A method of reproducing and simulating road PEMS according to claim 2, wherein in step three, said altitude and vehicle speed data are converted into gradient and vehicle speed data corresponding thereto.
4. 4. A method of reproducing and simulating road PEMS according to claim 3, wherein in step four, a test time is allocated according to a road condition on which the vehicle is required to travel, and a time-vehicle speed curve and a time-gradient curve are drawn based on the test time, gradient and vehicle speed data corresponding thereto.
5. 5. The method of reproducing and simulating road PEMS according to claim 4, wherein in step five, said time-gradient curve is imported into a hub stand console computer to set a road spectrum parameter of a hub, and said control system of said hub stand outputs a resistance of the hub according to the time-gradient curve to simulate a running resistance of the vehicle on the hub during road test.
6. 6. A method of reproducing and simulating road PEMS according to claim 4, wherein in step seven, said vehicle to be tested is controlled to travel on a hub stand according to a time-vehicle speed curve.

Description

Method for reproducing and simulating road PEMS test Technical Field The present invention relates to PEMS testing of vehicles, and more particularly, to a method of reproducing and simulating road PEMS testing. Background Development of new vehicle models by whole vehicle factories requires reporting of environmental protection and announcement authentication, which is necessary for road PEMS authentication. Road PEMS certification mainly detects whether the tail gas emission index meets the standard of GB 17691-2018 heavy diesel vehicle pollutant emission limit and test method (China sixth stage) (national Six Codes for short). At present, before the road PEMS authentication of the whole vehicle is carried out, road PEMS bottoming test is carried out on PEMS equipment of the whole vehicle manufacturer or the household of the engine manufacturer, and the road PEMS authentication is carried out on the premise that the emission result (mainly NOX, CO, PN or THC emission value) of the bottoming test is qualified. But at present, the following conditions exist: The road PEMS test method comprises the steps of carrying out road PEMS bottoming test by a whole vehicle manufacturer or an engine manufacturer, wherein the emission result is qualified, but when a vehicle is delivered to a detection center to carry out road PEMS authentication, the emission result is unqualified, or the detection center carries out road PEMS authentication, the emission result is unqualified, the emission result is fed back to the vehicle manufacturer or the engine manufacturer, and the vehicle manufacturer or the engine manufacturer re-carries out road PEMS retest by using own PEMS equipment, and the rest retest result is qualified. Therefore, the road PEMS model test has obvious deviation from the emission result of the test center authentication test, and the working conditions (running route, altitude, vehicle speed, rotating speed, driver driving behavior and the like) of the road PEMS model test and the test center authentication test are different, so that the vehicle speed, torque, exhaust flow and the like are different. As shown in fig. 1,2, 3 and 4, the vehicle speed, the altitude, the exhaust gas flow and the torque are respectively compared with each other, and the difference between the two is large. And if the working condition difference is larger, the emission result difference is larger, and the road PEMS test result cannot well evaluate the authentication result of the detection center. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a method for reproducing and simulating a road PEMS test, which realizes accurate and effective PEMS bottoming test before the vehicle road PEMS authentication test and saves the authentication cost and time of automobile manufacturers. The invention relates to a method for reproducing and simulating road PEMS test, which comprises the following steps: step one, installing PEMS equipment on a rotating hub rack; Step two, acquiring data acquired by a PEMS test of a detection center; Step three, converting the data collected by the PEMS test of the detection center into test data suitable for a rotating hub rack; drawing a test curve according to the test data; step five, the test curve is led into a hub rack console computer; step six, detecting the vehicle to be tested before the test, and driving the vehicle to be tested on the hub rack; Step seven, carrying out a hub bench test of PEMS test on the vehicle to be tested according to the test curve; And step eight, after the test is completed, processing, analyzing and exporting a result and reporting PEMS test data. Preferably, the data collected by the detection center PEMS test includes altitude and vehicle speed data. Preferably, in step three, the altitude and vehicle speed data are converted into gradient and vehicle speed data corresponding thereto. Preferably, in the fourth step, a test time is allocated according to the road condition of the vehicle required to travel, and a time-vehicle speed curve and a time-gradient curve are drawn based on the test time, the gradient and the vehicle speed data corresponding thereto. Preferably, in the fifth step, the time-gradient curve is imported to a hub stand console computer to set road spectrum parameters of the hub, and the control system of the hub stand outputs resistance of the hub according to the time-gradient curve to simulate running resistance of the hub in road test. Preferably, in step seven, the vehicle to be tested is controlled to run on the hub rack according to a time-vehicle speed curve. Advantageous effects The invention has the advantages that: 1. According to the invention, the PEMS test of the vehicle is transferred to the hub rack for carrying out according to the data acquired by the PEMS test of the detection center, so that the accurate and effective PEMS bottoming test of the vehicle road before the PEMS authentication te