1、5800 英文单词，英文单词，3 万英文字符万英文字符，中文中文 9600 字字 文献出处：文献出处： Walker P D, Zhang N, Tamba R. Control of gear shifts in dual clutch transmission powertrainsJ. Mechanical Systems and Signal Processing, 2011, 25(6): 1923-1936. Control of gear shifts in dual clutch transmission powertrains Paul D. Walker, Nong Zha
2、ng, Richard Tamba Abstract To achieve the best possible responses during shifting in dual clutch transmissions it is commonplace to integrate clutch and engine control, while the clutch is used to match speeds between the engine and wheels via reduction gears, poor engine control can lead to extende
3、d engagement times and rough/harsh shift transients. This paper proposes a method for combined speed and torque control of vehicle powertrains with dual clutch transmissions for both the engine and clutches. The vehicle powertrain is modelled as a simple four degree of freedom system with reduction
4、gears and two clutches. Including a detailed clutch hydraulic model, comprising of the direct acting solenoids and clutch piston with the hydraulic fl uid modelled as a compressible fl uid. Powertrain control is realised through control of clutch solenoids and manipulation of the engine throttle inp
5、ut. Sensitivity study of clutch performance evaluating inaccurate torque estimation demonstrated variance in the response of the hydraulic system, with an indicative simulation of poor estimation resulting in increased powertrain vibration during and after shifting. Simulations are conducted to demo
6、nstrate the capacity for this method of engine and clutch control to further reduce shift transients developed in dual clutch transmission powertrains. The obtained results also show that the adoption of torque based control techniques for both the clutch and engine, which makes use of the estimated target clutch torque, signifi cantly improves the powertrain response as a result of reduction in the lockup discontinuities. Keywords: Dual clutch transmission; Powertrain; Hydraulics; Control ;
