Development Of Integrated Test And Control Bench For Pneumatic Anti-lock Braking System Of Commercial Vehicle

Electronic Control Unit (ECU) is the core component of pneumatic Anti-lock BrakingSystem (ABS) of commercial vehicle. At present, the research and development of ECU is acombination of road testing and hardware-in-the-loop simulation technology. In the earlystages of ECU development, test conditions can be controlled, and test can be repeated, byusing hardware-in-the-loop simulation technology. So, the platform, which name is“Development of Integrated Test and Control Bench for Pneumatic Anti-lock BrakingSystem of Commercial Vehicle”, is a very important tool in the ECU R&D process.This research project is relying on a National Natural Science Foundation item named“Control study based on the multi-objective model to predict the kinetic stability ofheavy-duty semi-trailer (Number:51075176)”. In order to validate the control logic and testthe ability to determine the failure of ECU, in-depth research and testing is very muchneeded. Based on the study of domestic and foreign-related test platform, program to build atest bed was put out. The following research is based on this program, and the research workstarted. In the nest research work test content and evaluation methods were put out, andopen-loop tests and closed-loop test was finished. In addition, the Lab VIEW software,developed by the U.S. NI software, is used to develop interactive interface of the test rig.The paper is mainly about several aspects of research work:(1) Established the overall program on All-round Test and Control Rig for PneumaticAnti-lock Braking System of Commercial Vehicle. According to the research requirements, started the research work of pneumatic ABS ofcommercial vehicle, which are based on the overall structure of s domestic and foreign-related test platform for pneumatic ABS of commercial vehicle. According to the actualfunctional requirements of development of ECU, the all-round test and control Rig, whichfunction is designed to test the control logic and test the ability to determine the failure ofECU, was designed.(2) Research on fault diagnosis logic of ECUBased on wheel speed analog agencies and the test platform，by the control of thepre-treatment microcontroller, the Simulink model for the fault diagnosis strategy of ECUcan be achieved the test on fault diagnosis logic. Call the fault diagnosis model, which hasbeen compiled, through real-time simulation technology and Lab VIEW user interface, anddownloaded to the target machine. The fault diagnostic tests were achieved. The faultdiagnosis model simulate such a process, this process is beginning from the beginning ofconnected of ABS, the static test was testing, when the vehicle ignition start, the dynamictest was beginning.(3) The design of interactive interfaceLab VIEW interface software developed by National Instruments (NI) is used todevelop the user interface of the test rig. The user interface is friendly and practical. Thefunction of the interface include:44kinds of real vehicle fault automatic ECU automatic testand ECU sub-test. Verify the control strategy of ECU. Vehicle parameters can be modified inthe man-machine interface. The speed can be modified on the man-machine interface. Theinteractive interface can be calculated adhesion coefficient utilization.(4) Test content and evaluation methods about All-round Test and Control Rig forPneumatic Anti-lock Braking SystemFor commercial vehicle pneumatic ABS, after a reference to some standard, forexample, GB12676-1999and GB/T13594, test method is summarized. Those methods canbe used to test on fault diagnosis logic. Through a series of experiments, not only the all-round test and control Rig can validatethe control logic and test the ability to determine the failure of ECU, but also the interactiveinterface is very convenient. The use of this simulation technology can significantly shortenthe product development cycle, and reduce the cost of R&D. These studies are also veryuseful for the R&D of ECU of EBS.