Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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Analysis of Diagnosis Algorithm Implemented in TCU for High-Speed Tracked Vehicles

고속 무한궤도 차량용 변속제어기 진단 알고리즘 분석

  • Jung, Gyuhong (Department of Computer Aided Mechanical Engineering, Daejin University)
  • Received : 2018.08.01
  • Accepted : 2018.10.22
  • Published : 2018.12.01
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Abstract

Electronic control units (ECUs) are currently popular, and have evolved further towards the high-end application of autonomous vehicles in the automotive industry. Such digital technologies have also become widespread, in agriculture and construction equipment. Likewise, transmission control of high-speed tracked vehicles is based on the transmission control unit (TCU), performing complex gear change control functions, and diagnostic algorithms (a TCU's self-diagnostic and reporting capability of malfunction data through CAN communication). Since all functions of TCU are implemented by embedded-software, it is hardly possible to analyze specifications by reverse engineering. In this paper a real-time transmission simulator adaptable to TCU is presented, for analysis of diagnosis algorithm and standards. Signal simulation circuits are deliberately designed considering electrical characteristics of TCU inputs and various analysis tools, such as analog input auto scan function, and global output enable switch, are implemented in software. Test results from hardware-in-the-loop simulator verify tolerance time for each error, as well as cause of fault, error reset conditions.

Keywords

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Fig. 1 Transmission gear train stick diagram

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Fig. 2 TCU with jumper connectors

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Fig. 3 TCU I/O signals

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Fig. 4 Transmission simulator

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Fig. 5 Closed-loop control of TCU analog input

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Fig. 6 Analog input in monitoring program

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Fig. 7 Typical transient response for F2→F3

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Fig. 8 PSV current and PWM duty sensing

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Fig. 9 Voltage output in auto scan function

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Fig. 10 Slip time 2-3 load upshift error(No. 170)

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Fig. 11 Gear slip error(No. 168)

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Fig. 12 F2→F3 shift at limp-home

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Fig. 13 Shift map at normal and limp-home

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Fig. 14 BF PSV open circuit error(No. 151)

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Fig. 15 EU1 errors with auto scan function

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Fig. 16 OP3 error with global enable switch

Table 1 Clutch and brake engagement

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Table 2 CAN messages

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References

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