Application areas:
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Signal acquisition / product testing
challenge:
The Electron-c Stability Program (ESP, the same below) real-world road test is not only very demanding on the site, the test process is quite dangerous, and there are more signals to be measured. The experimental data acquisition system must not only be able to collect various signals, but also be able to work stably and reliably in harsh test environments (such as shock, vibration, high temperature, high humidity, etc.).
application solution:
Faced with the demanding test environment and numerous test signals of ESP system, based on NI PXI and LabVIEW test platform, we quickly integrated analog signal, digital signal, CAN, serial port and other signal acquisition and processing in a short time. . The NI data acquisition system successfully completed the data collection of the ESP test process at the Hainan test site, ensuring the smooth progress of the test.
Products used:
LabVIEW 2009 Software Development Platform
PXI-1042Q 8-slot PXI chassis
PXI-8106 embedded real-time controller
PXI-6251 M Series Data Acquisition Card
PXI-6259 M Series Data Acquisition Card
PXI-8430 serial card
PXI-6608 Digital IO Module
PXI-8512 CAN card
Overview
The automotive electronic stability control system can assist the driver to control the dynamic characteristics of the vehicle, and control the yaw rate of the vehicle by controlling the braking force of the wheel and the output torque of the engine to limit the yaw angle to a certain range, thereby assisting driving. Keep the stability of the car under extreme conditions and prevent the vehicle from being unstable.
In recent years, with the improvement of the active safety requirements of vehicles and the promotion of corresponding safety regulations in various countries, the standard assembly rate of ESP systems in automobiles has rapidly increased. Bosch, mainland and other foreign automotive electronics suppliers have ESP systems. Batch supply capability and occupy a major share of the market.
The research of domestic ESP system started late, mostly staying in the theoretical control research and hardware-in-the-loop simulation stage. Most domestic vehicle and component manufacturers directly use ESP systems such as Bosch, Continental, and TRW to match the self-developed vehicles.
Compared with the domestic ESP system strategy research, the ESP system performance test evaluation method is basically blank. Most of the verification experiments are based on the test methods of foreign parts manufacturers or corresponding institutions or directly commissioned by the test test suppliers. At present, the domestic automotive industry has not formed a unified ESP test standard, which makes it difficult for domestic OEMs to systematically evaluate the ESP control performance, and it is impossible to propose a perfect product design for automotive electronics suppliers in the product design stage based on the test results. The technical requirements have greatly increased the matching design cycle and R&D cost of the chassis electronic control system between the vehicle manufacturer and the automotive electronics supplier.
In view of the above situation, the research team combined with the current research basis, proposed a set of automotive chassis electronic control system performance evaluation and experimental test process specifications and built a measurement and control system platform for ESP system test and test.
ESP system test platform
The ESP system test platform built by the research group mainly includes three parts: 1. ESP test test process specification; 2. Test data acquisition system; 3. Test evaluation standard.
Figure 1 ESP system test platform architecture
The test test procedure specification specifies the test items, test objectives, test variables and instruments, test conditions, test methods, and experimental data processing methods required for ESP testing.
The test evaluation standard is used as a guide for the electronic control system and the evaluation of the performance of the whole vehicle. From the basic theory of the automobile, the method and corresponding principle for the evaluation of the performance are specified.
The test data acquisition system includes sensors and their data acquisition cards and associated software for measuring the required variables (vehicle parameters and motion status) during the test. The performance of the test data acquisition system determines to some extent whether the entire test system can accurately evaluate the performance of the vehicle and the advantages and disadvantages of the ESP system.
ESP is the latest generation of automotive active safety systems. ESP is a system based on vehicle dynamics that applies precise control to critical vehicle instability to improve vehicle stability. Therefore, in order to verify the performance of the ESP system, a large number of real vehicle tests are required. Completion of test data collection will face two major problems: First, there are many test equipment (GPS, gyroscope, non-contact photoelectric speedometer, wheel speed sensor, pressure sensor, trigger, etc.), and second, the test environment is bad (impact, Vibration, high temperature, high humidity, etc.). Through research, we chose the test platform for NI PXI and LabVIEW.
Figure 2 ESP data acquisition system interface
Figure 3 ESP data acquisition system PXI chassis
Figure 4 Test System Sensor
Figure 5 ESP single shift line test vehicle trajectory
Figure 6 ESP single shift line test wheel cylinder brake pressure
in conclusion
ESP is a major direction for the development of automotive active safety systems in the future. ESP real vehicle road test is not only the final evaluation method for the advantages and disadvantages of ESP control system. ESP real vehicle road test also has certain guiding significance in the development stage of ESP control algorithm.
Based on the good scalability of the PXI system, we quickly built a test platform for the performance test of the ESP system. In the extremely harsh test environment, the test system accurately and effectively collected the test signals of the ESP system test, which greatly promoted the chassis control of the 863 program. The systematic research has provided strong support for the further improvement of our own chassis electronic control system.
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