Shifting control of an automated mechanical transmission without using the clutch

Design and implementation of an engine control strategy during gear shifting process of automated manual transmission (amt) for improvement of shift quality and fuel efficiency

“…al. in Ref [1] proposed a control algorithm that combines speed and torque control of AMT vehicle powertrain to achieve shifting control without using the clutch. The torque control is achieved using PID mechanism.…”

“…Design and Implementation of an Engine Control Strategy During Gear Shifting Process of Automated Manual Transmission (AMT) for Improvement of Shift Quality and Fuel Efficiency 331 _____________________________________________________________________________________________ torque restoration [1]. First the system undergoes a torque control phase in which the engine is controlled to a torque level corresponding to zero transferred torque in the transmission.…”

Dynamic Coordinated Shifting Control of Automated Mechanical Transmissions without a Clutch in a Plug-In Hybrid Electric Vehicle

“…The process of AMT shifting without a clutch can be divided into five phases [10]: (1) where C is the mode clutch, which is connected in hybrid driving mode and disconnected in motor driving mode; S is the synchronizer, J e is the equivalent moment of inertia of the engine and the driving parts of the clutch, J m is the moment of inertia of the motor, J c is the equivalent moment of inertia of the driven parts of the clutch and the transmission input shaft, J t_o is the equivalent moment of inertia of the transmission output shaft, T e is the engine torque, ω e is the engine speed, T m is the torque transmitted by the motor, T c is the torque transmitted by the clutch, ω c is the speed of the driven parts of the clutch, T t_r is the external resistance torque of the transmission output shaft, ω t_o is the speed of the transmission output shaft, i g(n) is the transmission ratio of the n gear (n = 1st, 2nd, …, 5th), T t_io is the torque transmitted from the input shaft to the output shaft, T t_oi is the torque transmitted from the output shaft to the input shaft. The relationship between T t_oi and T t_io is as follows: (3) where η T is the transmission efficiency.…”

Modelling and simulation of synchronization and engagement for self-energizing synchronizer with multibody dynamics

“…Simple equations were used to represent the synchronization process. Zhong et al 20 proposed a 3-degree-of-freedom (DOF) finite element model of the AMT where the synchronizer torque was modelled as a function of the shifting force, the average effective radius, the friction coefficient and the cone angle of the ring. Galvagno et al 21 presented the kinematic and dynamic analyses of a power-shift AMT.…”