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Research on Integrated Control Strategy for Clutch of Heavy-Duty Commercial Vehicle with AMT during Starting

Author: YuMengJin
Tutor: LiuZhenJun
School: Chongqing University
Course: Mechanical and Electronic Engineering
Keywords: Heavy-Duty Commercial Vehicle Automated Mechanical Transmission Starting Control Hydraulic Control and Gas Power-assistance Clutch
CLC: U463.211
Type: Master's thesis
Year: 2009
Downloads: 292
Quote: 6
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Abstract

At present, manual transmission with several shifts and mechanical clutch are generally used in domestic heavy duty commercial vehicles. Because of several shifts of the transmission, frequently up shift and down shift, big power of the shift operation, and coordinated manipulation of the throttle pedal, clutch pedal and shift handle, they its will make many issues, for example skilled manipulation skills is been requirement to the driver and it will be easy fatigue, at the same time it will bring us a severe traffic safety. If the manual transmission is replaced by automated mechanical transmission (AMT), clutch pedal is canceled and automated joint procedural is realized, the difficulty of driving skills and intensity of driving operations will be reduced, and the performance and technology of vehicle will be improved greatly. In this paper, combined with the commitment to Science and Technology commission of Chongqing Municipality plans to focus on science and technology research project "the development of machinery and product development of drive system of heavy duty vehicle with automated mechanical transmission", clutch system and its control of heavy vehicles during starting are researched deeply, The research contents are shown as follows:①Design and develop a new type of hydraulic control and gas power-assistance clutch automatic control system, based on its equivalent physical model, establish a mathematical model of clutch automatic control system, simulate and analysis the response characteristics of the system; at the same time taking into account the closed-loop automatic control system the special circumstances of failure of the clutch, open-loop control methods were studied and the method to get duty cycle of high-speed switching solenoid valve is given under the conditions of open-loop;②establish a dynamic mathematical model of the clutch during starting,analysis clutch performance indicators and related requirements of its control, study the speed control method of clutch engagement in order to fully reflect the intention of driver during starting, and use double-layer fuzzy control method to establish clutch engagement model during the initial stage of sliding;③Analysis the engine speed control theory, establish mathematical model of the engine, design the electronic throttle controller of the engine during starting the vehicle, then establish engine speed control model based on the above-mentioned method, simulate and analysis the process of change in engine speed during starting the vehicle, at the same analysis anti-jamming capability of the control system during fluctuations in engine speed occurs;④Establish the integrated control simulation model of the vehicle during starting the vehicle, simulate and analysis the typical initial condition during starting, simulation results show that: an integrated control strategy which is established in the this paper achieve a smooth clutch engagement during starting the vehicle and reflect the intention of driver effectively;⑤Analysis the test theory of clutch system which is fixed in the heavy-duty vehicles with AMT, introduce layout programs of the vehicle test-board system as well as some hardware and software of test system, at the same time analysis the clutch performance of some key-board tests and give the corresponding test results. The results show that: the development of clutch automatic control system used in heavy vehicles with AMT meets the performance requirements of the initial vehicle.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Transmission > Mechanical transmission > Clutch
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