Research Article Research on Fault Diagnostic System in CVT Based on UDS
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1 Hindawi Publishing Corporation Advances in Mechanical Engineering Article ID Research Article Research on Fault Diagnostic System in CVT Based on UDS Jiande Wang, Yunshan Zhou, and Quan Li Engineering Research Centre of Automotive Electronics and Control Technology, Ministry of Education, Hunan University, Changsha , China Correspondence should be addressed to Jiande Wang; Received 9 July 2014; Revised 6 September 2014; Accepted 15 September 2014 Academic Editor: Hongwei Guo Copyright Jiande Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. A communication model of diagnostic network and implementation of unified diagnostic services (UDS) based on controller area network () bus are presented in this paper, and fault diagnostic function of transmission control unit (TCU), USB- (universal serial bus-) hardware and software modules, and fault diagnostic software based on personal computer (PC) are designed. Model diagnostic method is applied on ratiocontrol, and fault diagnostic system is tested in vehicle. 1. Introduction More and more automotive electronic control modules start touseinsteadoftraditionalk(iso14230)diagnostic mode due to its higher speed and reliable method. In order to unify different on-board network diagnostic services, ISO established a general diagnostic communication protocol, ISO14229, which is also called UDS. The protocol can satisfy the demands of Europe on-board diagnostics (E- OBD)systemandconformtothedevelopmenttrendof modern network bus system, which will become the future vehicle industry general diagnostic criteria [1, 2]. Continuously variable transmission (CVT) electronic control unit, as an important module of automotive electronics, uses a diagnostic method to monitor the transmission system and components operation. On the one hand, if a fault happens in system, the diagnostic system freezes frame data and providesreal-timewarning.also,thediagnosticequipment can provide real-time, accurate working data, and diagnostic information for after-sale diagnostic analysis, achieving the purpose of repairing and monitoring [3]. 2. The Communication Mode of Diagnostic Network Diagnostic protocol is divided into application layer, network layer, data link layer, and physical layer. Service identifier and the format of the parameters and content of specific diagnostic service which follow ISO14229 are defined on application layer. The format of the parameters and content of specific diagnostic service in service identifier in application layer conform to ISO Data is transmitted in the form of a single frame or multi frame, which follow ISO [4]. On data link layer, it is responsible for the single frame or multi frame under the network layer data sent by the physical layer, or which received frame from the physical layer and submitting it to the network layer [5]. Diagnosticprocessisalwaystobelaunchedbydiagnostic equipment, after electronic control unit accepting the request of service and resolving step by step according to diagnostic protocol.eventually,theserviceispassedtotheapplication layer, as shown in Figure The Implementation of the UDS on Bus Theunsegmenteddataflowandsegmenteddatafloware defined in network layer of ISO15765 protocol. The unsegmented data flow consists of a single frame, where single frame length is no more than 7 under normal addressing mode or less than 6 under extended addressing mode. The segmenteddataflowconsistsofamessageofmultiframe section. The data length is more than 7 under normal
2 2 Advances in Mechanical Engineering Tester node Application layer Diagnostic service Diagnostic service Network layer Message package/unpackage Message package/unpackage Data link layer Message transmit/receive Message transmit/receive Physical layer driver driver _H _L Response Request Figure 1: The communication model of diagnostic network. addressing mode or more than 6 under extended addressing mode.thedatastreamcontainsofafirstframeandmultiple consecutive frames. Two types of message transmission are shown in Figure 2. The single frame, first frame, the consecutive frame, and flow control all contain data domain of 8 bytes. The data domain consists of protocol control information and data transmission. The structure of all kinds of messages is shown in Table 1 [6]. TCU supports the following addressing modes: physical addressing mode and functional addressing mode. In the physical addressing mode, all messages are received by TCU physical address. TCU can perform services which are supported by the activation diagnostic session when the physical addressing mode request is activated. In the functional addressing mode, message is requested when request information of diagnostic equipment is not in the case of a particular module. TCU supports normal and extended diagnostic modes. When the vehicle is ignited, TCU is initialized into the normal mode. Meanwhile, the controller functions and diagnostic services are activated, but the specification execution from the customer is not allowed under the extended mode. Table 1: Data domain structure. Frame type Byte 1 Bit 7-4 Bit 3-0 Byte 2 Byte 3 Byte 4 8 Single frame 0 SF DL SID data 1 6 First frame 1 FF DL SID data SN data 1 7 Flow control 3 FS BS STmin Remarks: SF DL denotes 4-bit single frame data length; SID denotes service identifier; FF DL denotes 12-bit first frame data length; SN denotes sequence number; FS denotes data flow state; BS denotes block size; STmin denotes the minimum time interval. 4. UDS Diagnostic Services The application of the diagnostic function of UDS is the diagnostic services. UDS diagnostic services can be organized into the six categories, including diagnostic and communication management service, data transmission service, data storage, input/output control service routines, remote wakeup service, and upload/download service [7]. Diagnostic and communication management service is to define the main session control service and the communication parameter setting, which guarantee the normal work during the process
3 Advances in Mechanical Engineering 3 Sender Receiver Sender Receiver Sender Receiver First frame Flow control frame Flow control frame Single frame (a) Unsegmented message (b) Segmented message Figure 2: Unsegmented and segmented message. Table 2: UDS diagnostic services. Service Function addressing Physical addressing SID Service name rmal mode Extended mode rmal mode Extended mode Diagnostic and communications management 10 Diagnostic session control I I I I 11 ECU reset service I I 27 Security access I I 3E Tester present I I I I Data transmission 22 Read data by identifier I I I I 2E Write data by identifier e Stored data 14 Clear diagnostic information I I I I 19 Read DTC information I I I I Remarks: I denotes diagnostic supported under any security condition; e denotes diagnostic only supported under unlock security condition. of diagnostic communication. Data transmission service mainly monitors the parameters of vehicle in real-time. Storing data service reads and clears up the ECU internal fault code for fault diagnosis. Input/output control function unit controls the input/output of vehicle ECU. Remote wake-up service activates ECU internal diagnostic routines. Upload/download service is primarily used in exchanging a large number of data between diagnostic equipment and the internal ECU of vehicles. UDS diagnostic services implementation of TCU is shown in Table The Design of the Fault Diagnostic System According to ISO15765, information ID from TCU to diagnostic equipment is set to 0x7E9 (standard frame). physical addressing information ID from diagnostic equipment to TCU is set to 0x7E1. functional addressing information ID from diagnostic equipment to TCU is set to 0x7DF.Thecommunicationusesthebaudratewith 500 kbps. The structure of fault diagnostic system is shown in Figure 3, including TCU fault diagnostic software, the USB- hardware and software, and implementation of TCU diagnostic function TCU Fault Diagnostic Software Design. The software is developed with the platform C++ Builder, which adopts modular design. The structure of the software system is shown in Figure 4. (1) Communication Module. It receives TCU fault information and the important parameters in the process of transmission operation, which is based on the diagnostic communication specification. (2) Fault Information Management Database. It builds up the fault table and stores the fault information and specific description of the fault codes.
4 4 Advances in Mechanical Engineering TCU fault diagnostic software (PC) USB USB- TCU Figure 3: Structure diagram of TCU fault diagnostic system. Fault diagnostic interface Software setting DTC operation Data flow operation Fault information management database Fault diagnostic management module Monitoring alarm module communication module Figure 4: Structure diagram of TCU fault diagnostic software. Figure 5: Main interface of TCU fault diagnostic system. (3) Fault Diagnostic Management Module. It analyzes the fault diagnostic message for fault diagnostic information. Fault code, description, and other information can be displayed in the interface of the fault diagnostic software. (4) Monitoring Alarm Module. When the failures are detected, they are divided into general failure and severe failure, according to the severity of the fault. General failure lights trouble light, while severe failure flashes trouble light. (5) Fault Diagnostic Interface. It is used to set the communication port number, baud rate, and diagnostic data storage paths and show fault codes. Moreover, the data flow operation is also in fault diagnostic interface, which provides real-time data flow monitoring function, and display the important parameters. The main interface of TCU fault diagnostic system is shown in Figure The Hardware Design of USB-. USB- include MCU,transceiverandUSBserialportmodule.Its framework is shown in Figure 6. The controller uses the MC9S08DZ60 because of its low cost and low power consumption. communication module adopts the TJA1040 of NXP. The transceiver has very low electromagnetic radiation and high ability of resistance to electromagnetic, which is fully compatible with ISO11898 protocol and supports high communication rate up to 1 Mbps. The interface between the USB and serial port module adopts FTDI s FT232RL, which is applied for the USB to serial port interface conversion The Software Design of USB-. The software function of the USB- is to realize the data interaction between the message on the bus and the USB of PC which serves a virtual serial port. This is because many current
5 Advances in Mechanical Engineering 5 USB- OBD interface tranreceiver MCU SCI USB converter USB PC diagnostic software Figure 6: Framework of USB-. TCU Secondary pressure Key lock Oil temperature P Analog input High side onoff output Shift lock Reverse light R N D S Manual plus Manual minus Digital input PWM output Primary valve control Secondary valve control Clutch valve control Snow mode Lock valve control Brake Ignition H Primary speed Calibration L Secondary speed Turbo speed Frequency input Communication H L 12 V GND Power input Sensor power output 5 V Figure 7: Principle block diagram of TCU. notebook makers canceled the serial port. Since serial port protocolissimple,theinterfaceiseasytobedeveloped.the virtualserialportisselectedtocommunicatewithpc.firstly, slave computer receives some serial communication data with ID, which was sent by diagnostic software from PC. Then a message is sent to the TCU by MCU and MCU receives a reply message from TCU. After that, MCU restructures the message and sends it to the host PC The Development of TCU Diagnostic Function. The TCU diagnostic function diagram is shown in Figure 7.
6 6 Advances in Mechanical Engineering Start of service Request SID supported? Negative response $11 Service not supported Session supported? Negative response $7F Service not supported in current session Length supported? Negative response $13 Invalid message length Sub-function supported? Negative response $12 Sub-function not supported Positive response ready? Extended response time window? Negative response $78 Request received Response pending Positive response Negative response $XX Other negative response End of service Figure 8: The process of TCU responding diagnostic service. (1) TCU Self-Diagnosis Function. The input and output signal have a certain range when CVT is operating. If a signal value is beyond this range and this phenomenon does not disappear after a period of time, TCU will make a judge based on the rule of failure [8]. TCU will store the fault in the form of a code in EEPROM, lighting trouble light at the same time. (2) TCU Failure Protection Function. When TCU detects some malfunctioning in the sensors or actuators, TCU will provide alternative signals or setting goals to take the place of the fault signal, which is to maintain the control system to ensure the transmission operating. The flow chart of diagnostic services is shown in Figure 8. The diagnostic services adopt the judgment step by step. In Table 3, the subfunction, the request parameters, positive response identifier, positive response parameters, and the negative response code in diagnostic services are listed. Taking diagnostic model control as an example, if diagnostic equipmentrequestmessageis ,tcu responsemessagewillbe negative response message of unmatched session is 03 7F Studying the Method of CVT Fault Diagnosis. The schematic diagram of CVT hydraulic system is shown in Figure 9. In CVT, the clamping force of the primary pulley and the secondary pulley is controlled by a hydraulic valve. The secondary cylinder pressure is controlled by the proportional relief valve, preventing large metal belt slip
7 Advances in Mechanical Engineering 7 x y Primary pulley Pump V-belt P s Clamping control Ratio control P P Secondary pulley Figure 9: CVT hydraulic principle diagram. Table 3: UDS diagnostic service definition. SID Request subfunction Request parameter Positive response identifier Positive response parameter 01 rmal mode Extended mode 03 Negative response code 1 12, 13, Hardware reset , 13, 22, Software reset Request seed 67 xxxxxxxx 12,13,22,24,31,35, 02 Transmit key xxxxxxxx 36, 37 3E 00 Need response 7E 0 12, DID 2 62 DID + content 12,22,31,33 2E DID + content 6E DID 12,22,31,33,72 14 FF FF , 22, Read DTC 3 number 19 by identifier FF 59 DTC 12, 13, 31 0A Read all DTC DTC Remarks: 1 negative response code: definition as shown in Table 4; 2 DID: data identifier; 3 DTC: diagnostic trouble code. Table 4: Negative response code. NRC Meaning 12 h Subfunction not supported 13 h Incorrect message length or invalid format 22 h Conditions not correct 24 h Request sequence error 31 h Request out of range 33 h Security access denied 35 h Invalid key 36 h Exceed number of attempts 37 h Required time delay not expired 71 h Transfer data suspended 72 h General programming failure 7F h Service not supported in active session between the pulley and the metal belt and also maintaining an effective torque transmission of the engine [9, 10]. In the meanwhile, the primary cylinder pressure is controlled by the proportional reducing valve to achieve ratio control. Given the metal belt constraints, there is a nonlinear relationship between the speed ratio and the displacement between the primary pulley and secondary pulley. The real ratio is calculated by measuring the speed of the primary and the secondary pulley according to the ratio control. Considering the installation of a shift sensor, cost, and other factors, the ratio control is achieved by wheel speed detection of the primary pulley and secondary pulley through the speed sensor [11]. A ratio control model is designed as shown in Figure 10. The target ratio is obtained by a look-up table of the throttle
8 8 Advances in Mechanical Engineering Fuzzy control rule de/dt Fuzzy Fuzzy decision Ambiguity K p K i K d θ V Target ratio dθ/dt Ratio revise + PID PWM Ratio control vavle CVT variator ω P ω s Real ratio i=ω P /ω s Figure 10: Ratio control model. Ratio ( ) Target ratio Real ratio Time (s) Figure 11: Ratio comparing. position degree θ and the vehicle speed V, and then the target ratio is revised according to the rate of the throttle changing [12, 13]. Based on the difference between current ratio and the target ratio, the fuzzy controller calculates PWM (pulse width modulate) output, controlling the proportional valve in order to regulate the hydraulic cylinder to achieve the ratio control [14, 15]. Without the addition of CVT sensors, the online fault diagnostic ways of model-based ratio control system is explored [16, 17]. Firstly, the global and local output prediction models are developed based on the collection of data. Based on the discrepancy between the predicted output of the model and the actual output, diagnostic services are performed. Then the failure is isolated and positioned, according to measuring signal, output results of the global and local element s diagnostic model, and the preestablished diagnostic logic table [18]. 6. Diagnostic Function Tests In the early development stage of UDS function and TCU fault diagnostic software, the diagnostic function of Vector s bus analysis tool alyzer is used. The TCU and laptopareconnectedbyausb-modulefortestingand verifying completeness of whole diagnostic system. As can be seen in red oval of Figure 11, intherealvehicletest,thereal ratio cannot follow the target ratio well. So the diagnostic function is activated. Test results of reading the fault code and data flow in TCU fault diagnostic software are shown in Figure Conclusion A TCU fault diagnostic system is developed based on UDS in this paper. An accurate, fast, stable, and reliable data
9 Advances in Mechanical Engineering 9 (a) DTC operation (b) Data flow operation Figure 12: The test case of TCU fault diagnostic software. communication between the TCU and diagnostic platform canbeseeninthissystem.thediagnosticsoftwareissimple and intelligent. The entire system can run smoothly and diagnose accurately. Application result shows that the scheme of the design is reasonable and the system has the advantages of stable operation, low hardware cost, and a simple operation. Moreover, it has practical application promotion. Conflict of Interests The authors declare that there is no conflict of interests regarding the publication of this paper. Acknowledgment The work described in this paper was supported by the National High Technology Research and Development Program of China (863) (no. 2012AA111710). References [1] K. H. Johansson, M. Törngren, and L. Nielsen, Vehicle applications of controller area network, in Handbook of Networked and Embedded Control Systems Control Engineering, pp , [2] M.DiNatale,H.Zeng,P.Giusto,andA.Ghosal,Understanding and Using the Controller Area Network Communication Protocol, Theory an d Practice, Springer, New York, NY, USA, [3] R. Isermann, Diagnosis methods for electronic controlled vehicles, Vehicle System Dynamics, vol. 36, no. 2-3, pp , [4] ISO :2004, Road Vehicles Diagnostics on Controller Area Networks () Part 2: Network Layer services,2004. [5] M. Rings and P. Phillips, Adding unified diagnostic services over to an HIL test system, SAE Technical Paper , [6] ISO , Road Vehicles Diagnostics on Controller Area Networks () Part 3: Implementation of Unified Diagnostic Services (UDS on ),2004. [7] ISO, Road vehicles unified diagnostic services (UDS) part 1: specification and requirements, ISO :2013, [8] F. M. Discenzo, P. J. Unsworth, K. A. Loparo, and H. O. Marcy, Intelligent motor provides enhanced diagnostics and control for next generation manufacturing systems, Computing and Control Engineering Journal,vol.11,no.5,pp ,2000. [9]D.Patel,J.Ely,andM.Overson, CVTdriveresearchstudy, SAE Technical Paper , [10] M. Pesgens, B. Vroemen, B. Stouten, F. Veldpaus, and M. Steinbuch, Control of a hydraulically actuated continuously variable transmission, Vehicle System Dynamics,vol.44,no.5, pp , [11] W. Ryu and H. Kim, CVT ratio control with consideration of CVT system loss, International Journal of Automotive Technology,vol.9,no.4,pp ,2008. [12] H. Yeo, C. H. Song, C. S. Kim, and H. S. Kim, Hardware in the loop simulation of hybrid vehicle for optimal engine operation by cvt ratio control, International Journal of Automotive Technology,vol.5,no.3,pp ,2004. [13] Y.-H. Bae, S.-H. Lee, H.-C. Kim, B.-R. Lee, J. Jang, and J. Lee, A real-time intelligent multiple fault diagnostic system, International Journal of Advanced Manufacturing Technology, vol. 29, no. 5, pp , [14] H. Jin and A. Ge, On the intelligent slope shift strategy, Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, vol.221,no.8,pp , [15] L.A.M.Riascos,M.G.Simoes,andP.E.Miyagi, On-linefault diagnostic system for proton exchange membrane fuel cells, Journal of Power Sources,vol.175,no.1,pp ,2008. [16] B. M. Wilamowski, Neural networks and fuzzy systems, in Mechatronics Handbook,R.R.Bishop,Ed.,pp.1 50,CRCPress, [17] W. Ryu, J. Nam, Y. Lee, and H. Kim, Model based control for a pressure control type CVT, International Journal of Vehicle Design,vol.39,no.3,pp ,2005. [18] A. Scacchioli, G. Rizzoni, M. A. Salman, W. Li, S. Onori, and X. Zhang, Model-based diagnosis of an automotive electric power generation and storage system, IEEE Transactions on Systems, Man and Cybernetics,vol.44,no.1,pp.72 85,2013.
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