Papers by Keyword: Automated Mechanical Transmission

Abstract: Automated Mechanical Transmission achieves automatic shifting by applying electronic control technology in traditional dry clutch and Manual Transmission,not only having the advantages of automatic transmission, but also keeping the performance of the original manual transmission. This paper generally introduces the function and performance characteristics of Automated Mechanical Transmission, and elaborates its system structure, working principle and key technology. The key technology is divided into 4 parts, including Electronic Control System, Clutch Control, Shift Strategy and Design and Optimization of the Actuator. Combining with the related companies' research and development products, the performance of the Automated Mechanical Transmission is further analyzed. At the same time, according to the current research status in the world, putting forward the following research focus and development trend of Automated Mechanical Transmission.Keywords: Automated Mechanical Transmission; Key Technology; Development Trend

Abstract: Automated Mechanical Transmission (AMT) is applied as a new starting device for belt conveyor in the paper. Simulation model of AMT driving belt conveyor is established in AMESim. Simulations of start-up process at first gear condition and shifting process from first to eighth gear are discussed. Belt velocity is accepted as the law of gearshifts to judge the moment of shifting. Simulation results show that AMT could achieve the purpose of belt conveyor’s soft-starting gradually. The belt appears short-time acceleration mutations during shifting process which results in the belt maximum tension, the driving pulley torque, and other parameters changing within their allowable limits. The belt maximum tension appears short-time mutations when the clutch is just engaged, in which case the peak value of belt maximum tension can achieve 110 KN approximately, and is less than its allowable limit. After shift actions, the belt maximum tension and other parameters curves tend to be stable.

Abstract: Engagement control of the clutch in the starting process is the core part and difficulty of the Automated Mechanical Transmission (AMT) control strategy, which was directly related to the clutch disc lifetime and riding. Engine speed, clutch speed and throttle angle are the only signals to develop clutch control strategy in the entire start-up process made by Transmission Control Unit (TCU) in a vehicle equip with AMT. The TCU even need to determine the driver's intention to select different control schemes. In this paper, fuzzy logic control was adopted in order to eliminate the impact of subtle change during driver operation, thus the start quality was optimized.

Abstract: The Transmission Control Unit (TCU) of Automated Mechanical Transmission (AMT) can not only control drive train to shift automatically but also communicate with other controller to achieve coordination control. In this paper, Controller Area Network (CAN) communication of AMT is designed by using Motorola Scalable CAN Module (MSCAN) integrated in MC9S12DP256 Microcontroller. CAN communication protocol, CAN interface circuit and software are developed.

Abstract: In this paper, the gear-position decision method based on 3-parameter the optimal economical shift schedule for Automatic Manual Transmission (AMT) of Parallel Hybrid Electric Bus (PHEB) is proposed. Vehicle simulation model was built by using ADVISOR simulation software. The simulation results show that 3-parameter shift schedule has improved in economical performance of PHEB compared with 2-parameter shift schedule.

Abstract: Hardware-in-the-loop simulation model of AMT of heavy duty commercial vehicle is built in this paper. The testing methods of TCU underlying and control layer are brought up and a corresponding test case is added based on actual needs. This paper provides an effective testing method for a TCU program designer to modify control strategies.

Abstract: This paper presents an experimental study on engine control strategy during gear shifting for a Unimog U4000 equipped with an automated mechanical transmission (AMT) based on the controller area network (CAN) bus. First, an integrated powertrain control system based on the CAN bus is introduced. Second, the ideal AMT gear shifting process is described, and the engine control strategy during gear shifting is proposed. Then, the communication information for the engine control unit (ECU) and transmission control unit (TCU) during gear shifting is determined based on the SAE J1939 protocol. Finally, effectiveness is verified by the experimental results. The experimental results show that: engine control during gear shifting based on the CAN bus can meet the requirement for real-time operation; the engine control strategy presented in this paper during gear shifting can achieve good shift quality with shorter shifting time and less vehicle speed loss.

Abstract: In order to achieve the open of the AMT (Automated Mechanical Transmission) control system, and then convenience the updating progress. An open control system based on quantum frame is established adopting the advanced software technology of embedded system. Each step during the designing process is depicted, the application software is designed.

Abstract: Automotive transmission is one of the key components of automotive, and the design quality of transmission can affect the driving performance, fuel consumption and serve life of vehicle greatly, therefore it is very important to design planetary transmission of vehicle. Genetic algorithm can seek parallelized different regions of the whole parameter space in the progress of its replacement, and make a progress towards being possible to find optimum global solution. The planetary transmission is designed by the minimum volume of objective optimization, and considering loading property and material quality, the constraints are set up. Combination of genetic algorithm and SQP is adopted to solve optimization model. So the AMT have a more compact structure. and vehicle passing performance can be improved and vehicle equipment mass be reduced.

Abstract: For developing motor driven automated mechanical transmission of hybrid electrical vehicle, adjust and control the gear selecting motor, the gear shifting motor and the clutch motor. In the research of position-PID controller and robust disturbance observer, an automated mechanical transmission system based on position-PID was given. With Matlab, the position-PID controlling arithmetic and the controlling system models of the motors were built. Experimental results show that, a highly efficient and reliable automated mechanical transmission motor control system was developed.