Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forw...Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forward. It considers both jerk and slipping work which are the most commonly used quality evaluating indexes of vehicle starting phase. The adaptive control system and its reference model are discussed profoundly. Taking the adaptability to different starting gears and different road conditions as examples, some proving field test records are shown to illustrate the main clutch adaptive control strategy at starting phase. Proving field test gives acceptable results.展开更多
Taking a heavy-duty truck as a research platform,the changing characteristics of shifting force,shift time,and slipping work are obtained through theoretical analysis and manual shift test of a real vehicle. Based on ...Taking a heavy-duty truck as a research platform,the changing characteristics of shifting force,shift time,and slipping work are obtained through theoretical analysis and manual shift test of a real vehicle. Based on the analysis of the test results,a gear-shifting control strategy of the hydraulic automated shift control system is designed and experimentally verified on the bench. By optimizing the control parameters of high-speed switching valves,a control strategy and parameters are obtained,which can meet the requirements of dynamic performance and reliability.展开更多
To debug automatic mechanical transmission（AMT） more quickly and accurately,an AMT-fault-diagnosis device is designed based on the ISO 15765 protocol,which adopts the flow control mechanism and has off-line diagnost...To debug automatic mechanical transmission（AMT） more quickly and accurately,an AMT-fault-diagnosis device is designed based on the ISO 15765 protocol,which adopts the flow control mechanism and has off-line diagnostics function.Requirements for the device are analyzed and diagnostic trouble code（DTC） is defined.Electrically controlled hardware with graphics display function and fault diagnostic software flowchart are designed based on the electronic control hydraulic AMT system.Bench and vehicle driving tests showethat the AMT-fault-diagnosis device can read and delete the fault message successfully with a stable performance.展开更多
In order to make automatic mechanical transmission （AMT） capable of performing fault self-diagnoses and adaptive to standard communication interface,through technical analysis and intensive study concerning on-board...In order to make automatic mechanical transmission （AMT） capable of performing fault self-diagnoses and adaptive to standard communication interface,through technical analysis and intensive study concerning on-board diagnostic protocols now widely applied in Europe and America,KWP2000 on CAN is accepted as a technological path.An AMT fault communication system using hardware-in-the-loop simulation by dSPACE is developed,and communications compatible with ISO 15031-6 is realized on this module.Moreover,a hand-held fault diagnosis instrument with built-in software is designed to facilitate communications with AMT fault communication module with accuracy,rapidity and stableness.Bench and real vehicle experimental results show that the developed instrument and module can perform the anticipated functions,so as to maintain steady communications under the KWP2000-on-CAN protocol.展开更多
In order to diagnose gear shifting process in automated manual transmission（AMT）,a semi-quantitative signed directed graph（SDG）model is applied.Mathematical models are built by analysis of the power train dynamic ...In order to diagnose gear shifting process in automated manual transmission（AMT）,a semi-quantitative signed directed graph（SDG）model is applied.Mathematical models are built by analysis of the power train dynamic and the gear shifting control process.The SDG model is built based on related priori knowledge.By calculating the fuzzy membership degree of each compatible passway and its possible fault source,we get the possibilities of failure for each possible fault source.We begin with the nodes with the maximum possibility of failure in order to find the failed part.The diagnosis example shows that it is feasible to use the semi-quantitative SDG model for fault diagnosis of the gear shifting process in AMT.展开更多
文摘Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forward. It considers both jerk and slipping work which are the most commonly used quality evaluating indexes of vehicle starting phase. The adaptive control system and its reference model are discussed profoundly. Taking the adaptability to different starting gears and different road conditions as examples, some proving field test records are shown to illustrate the main clutch adaptive control strategy at starting phase. Proving field test gives acceptable results.
基金Supported by the National High Technology Engineering Program(302011)
文摘Taking a heavy-duty truck as a research platform,the changing characteristics of shifting force,shift time,and slipping work are obtained through theoretical analysis and manual shift test of a real vehicle. Based on the analysis of the test results,a gear-shifting control strategy of the hydraulic automated shift control system is designed and experimentally verified on the bench. By optimizing the control parameters of high-speed switching valves,a control strategy and parameters are obtained,which can meet the requirements of dynamic performance and reliability.
基金Sponsored by the National High Technology Research and Development Program of China("863"Program)(2006AA110115)
文摘To debug automatic mechanical transmission（AMT） more quickly and accurately,an AMT-fault-diagnosis device is designed based on the ISO 15765 protocol,which adopts the flow control mechanism and has off-line diagnostics function.Requirements for the device are analyzed and diagnostic trouble code（DTC） is defined.Electrically controlled hardware with graphics display function and fault diagnostic software flowchart are designed based on the electronic control hydraulic AMT system.Bench and vehicle driving tests showethat the AMT-fault-diagnosis device can read and delete the fault message successfully with a stable performance.
基金Sponsored by the National High-Tech Research and Development Program of China(2006AA110115)
文摘In order to make automatic mechanical transmission （AMT） capable of performing fault self-diagnoses and adaptive to standard communication interface,through technical analysis and intensive study concerning on-board diagnostic protocols now widely applied in Europe and America,KWP2000 on CAN is accepted as a technological path.An AMT fault communication system using hardware-in-the-loop simulation by dSPACE is developed,and communications compatible with ISO 15031-6 is realized on this module.Moreover,a hand-held fault diagnosis instrument with built-in software is designed to facilitate communications with AMT fault communication module with accuracy,rapidity and stableness.Bench and real vehicle experimental results show that the developed instrument and module can perform the anticipated functions,so as to maintain steady communications under the KWP2000-on-CAN protocol.
基金Supported by the Basic Research Foundation of Beijing Institute of Technology(20130342035)
文摘In order to diagnose gear shifting process in automated manual transmission（AMT）,a semi-quantitative signed directed graph（SDG）model is applied.Mathematical models are built by analysis of the power train dynamic and the gear shifting control process.The SDG model is built based on related priori knowledge.By calculating the fuzzy membership degree of each compatible passway and its possible fault source,we get the possibilities of failure for each possible fault source.We begin with the nodes with the maximum possibility of failure in order to find the failed part.The diagnosis example shows that it is feasible to use the semi-quantitative SDG model for fault diagnosis of the gear shifting process in AMT.
