고속 무한궤도 차량용 변속제어기 진단 알고리즘 분석

정규홍(Gyuhong Jung) 유공압건설기계학회 2018 드라이브·컨트롤 Vol.15 No.4

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.

고속 무한궤도 차량용 변속기 시뮬레이터 개발

정규홍(G. H. Jung) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11

Electronic control technologies which have long been developed for passenger cars nowaday spread to construction equipments and agricultural vehicles because of its outstanding performance achieved by embedded software. Especially, system program of transmission control unit(TCU) plays a crucial role for the superb shift quality, driving performance and fuel efficiency, etc. Since the control algorithm is embedded in software which is hardly analyzed, development such a TCU cannot be done by conventional reverse engineering. Transmission simulator is a kind of electronic device which simulates the electric signals including driver operation command and output of various sensors installed in transmission. Standalone TCU can be run in normal operation mode with the signals provided by transmission simulator. In this research, transmission simulator for the tracked vehicle TCU is developed in order for the analysis of shift control algorithm from the experiments with standalone TCU. It was confirmed that shift experimental data for the simulator setup conditions can be utilized for the analysis of control algorithms on proportional solenoid valves and shift map.

고속 무한궤도 차량용 변속기 시뮬레이터 개발

정규홍(Gyuhong Jung) 유공압건설기계학회 2017 드라이브·컨트롤 Vol.14 No.4

Electronic control technologies that have long been developed for passenger cars spread to construction equipment and agricultural vehicles because of its outstanding performance achieved by embedded software. Especially, system program of transmission control unit (TCU) plays a crucial role for the superb shift quality, driving performance and fuel efficiency, etc. Since the control algorithm is embedded in software that is rarely analyzed, development of such a TCU cannot be conducted by conventional reverse engineering. Transmission simulator is a kind of electronic device that simulates the electric signals including driver operation command and output of various sensors installed in transmission. Standalone TCU can be run in normal operation mode with the signals provided by transmission simulator. In this research, transmission simulator for the tracked vehicle TCU is developed for the analysis of shift control algorithm from the experiments with standalone TCU. It was confirmed that shift experimental data for the simulator setup conditions can be used for the analysis of control algorithms on proportional solenoid valves and shift map.

휠로더 자동변속기 시뮬레이터 개발

정규홍,신상호,이승일 사단법인 유공압건설기계학회 2007 드라이브·컨트롤 Vol.4 No.2

TCU is a shift controller for automatic transmission of which major functions are to determine the shift point and manage the shifting process based on the various input signals. As the recent digital control technologies advance, it plays a key-role to improve a transmission performance and its algorithm becomes more complicated. This paper describes the development of transmission simulator for wheel loader that enables a TCU for normal stand-alone operation by the real-time emulation of TCU interface signals. It can be utilized for the analysis of shift control algorithm implemented in a commercial TCU as well as for the development of brand new TCU.

고속 무한궤도 차량용 변속제어기 진단 알고리즘 분석

정규홍(G. H. Jung) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.11

Electronic control units(ECUs) are popular nowadays and evolved further to the high-end application of autonomous vehicles in automotive industry. Such digital technologies have also become widespread in agriculture or construction equipments. Likewise, transmission control of high-speed tracked vehicle is based on the transmission control unit(TCU), performing complex gear change control functions and diagnostic algorithms which is a TCU"s self-diagnostic and reporting capability of malfunction data through CAN communication. Since all the functions of TCU are implemented by embedded-software, it is hardly possible to analyze the design specifications by reverse engineering. In this paper a real-time transmission simulator which is adaptable to TCU is presented for the analysis of diagnosis algorithm and standards. The signal simulation circuits are deliberately designed considering the 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 the tolerance time for each error as well as the cause of fault, error reset conditions.

임베디드 변속기 시뮬레이터 개발

정규홍(Gyuhong Jung),김경동(Kyungdong Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

As the level of environmental regulation and the demand for high performance construction vehicles are increased every year, most of automatic transmission adopts an electronic controller to enhance the quality of shift as well as fuel economy. TCU, which consists of electric circuit hardware and system program software, plays an important role in managing the transmission control. Transmission simulator is a firmware development equipment that simulates the various kind of TCU input signals in real-time in order to save the design cost and time. This paper explains the development of embedded transmission simulator the whole functions are executed by TCU processor along with the shift control firmware. In addition to the computation of speed for fixed gears and during shift, its design includes the virtual fault code generation to verify the diagnosis and fail-safe TCU algorithm under development.

임베디드 변속기 시뮬레이터를 이용한 진단알고리즘 설계

정규홍(G. H. Jung),김경동(K. D. Kim) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.6

Simulator is a development equipment which enables the ECU to operate in normal mode by simulating the interface signal between ECU and mechanical system electrically. Embedded simulator means simulation function is embedded in ECU firmware, hence the electrical signal interface is replaced by the substitution of information at system program level. This paper explains the development of embedded transmission simulator for the verification of TCU firmware function which covers shifting control and on-board diagnosis. The embedded simulation program is executed in TCU processor along with the TCU firmware and it provides TCU firmware with not only the speed information those are appropriate both in driving and shifting conditions, but also the fault detection signals. Experimental results show that the validity of embedded simulator and its usefulness to the TCU firmware development and verification.

휠로더 변속기 시뮬레이터를 이용한 TCU 변속제어 알고리즘 분석

정규홍(G. H. Jung),신상호(S. H. Shin),김경동(K. D. Kim) 유공압건설기계학회 2007 유공압건설기계학회 학술대회논문집 Vol.2007 No.11

지게차 변속제어 알고리즘 검증을 위한 임베디드 변속기 시뮬레이터 개발

정규홍 사단법인 유공압건설기계학회 2023 드라이브·컨트롤 Vol.20 No.4

A forklift is an industrial vehicle that lifts or transports heavy objects using a hydraulically operated fork, and is equipped with an automatic transmission for the convenience of repetitive transportation, loading, and unloading work. The Transmission Control Unit (TCU) is a key component in charge of the shift control function of an automatic transmission. It consists of an electric circuit with an input/output signal interface function and firmware running on a microcontroller. To develop TCU firmware, the development process of shifting algorithm design, firmware programming, verification test, and performance improvement must be repeated. A simulator is a device that simulates a mechanical system having dynamic characteristics in real time and simulates various sensor signals installed in the system. The embedded transmission simulator is a simulator that is embedded in the TCU firmware. information related to the mechanical system that is necessary for TCU normal operation. In this study, an embedded transmission simulator applied to the originally developed forklift TCU firmware was designed and used to verify various forklift shift control algorithms.

트랙터 자동변속기 되먹임 변속 제어기 설계

정규홍(Gyu Hong Jung),정창도(Chang Do Jung),박세하(Se Ha Park) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.1

Nowadays automatic transmission equipped vehicles prevail in construction and agricultural equipment due to their convenience in driving and operation. Though domestic vehicle manufacturers install imported electronic controlled transmissions at present, overseas products will be replaced by domestic ones in the near future owing to development efforts over the past 10 years. For passenger cars, there are many kinds of shift control algorithms that enhance the shift quality such as feedback and learning control. However, since shift control technologies for heavy duty vehicles are not highly developed, it is possible to improve the shift quality with an organized control method. A feedback control algorithm for neutral-into-gear shift, which is enabled during the inertia phase for the master clutch slip speed to track the slip speed reference, is proposed based on the power transmission structure of TH100. The performance of the feedback shift control is verified by a vehicle test which is implemented with firmware embedded TCU. As the master clutch engages along the predetermined speed trajectory, it can be concluded that the shift quality can be managed by a shift time control parameter. By extending the proposed feedback algorithm for neutral-into-gear shift to gear change and shuttle shift, it is expected that the quality of the shift can be improved.