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Automated Manual Transmission (AMT) combines comfort of use with a reduction in energy consumption, with production costs that are consequently lower compared to traditional automatic transmissions. AMT is based on an electronic control unit and a mechanical system that supervise the use of the clutch and gear shifting, allowing the driver to change gear without using the clutch, either sequentially or fully automatically. This project aims to improve the shift quality and reduce fuel consumption by means of control of engine speed and torque during shift process. Before shifting to neutral gear the engine torque is reduced to a minimum level. The position of the shift motor is controlled effectively for shift off and shift on process. Before changing to new gear position the engine speed is controlled as per shift request i.e., upshift or downshift, after that gear engagement is performed and the engine torque is restored as per driver’s request. A virtual torsion sensor is designed using Kalman filter for estimating the torque transmitted through the drive shaft and a PID controller is designed to control this torque to a minimum level. The position of the gear actuator is also driven to reference position using PID mechanism. For speed control the advantage of both time-optimal control such as bang bang control and PID control are utilized. 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. Next in the speed synchronization phase, the gear disengages completely, and the gear selection starts as soon as the shifting off action is completed. The engine speed regulation is carried out simultaneously. Subsequently new gear is engaged and the engine torque is restored back to the level that the driver has commanded by the gas pedal. In the torque control phase the drive shaft torque is estimated using a virtual torsion sensor and is controlled using a PID controller. To accomplish the process of gear shifting, the position of the actuator must be controlled precisely. To account for the performance and the dynamic behavior of the actuator motor, this paper implements a PID controller. The engine speed control is divided into downshift and up-shift process. Considering the advantages of both time-optimal control and PID control, a combined control strategy for engine speed during the gear-shifting process is proposed. The controller chooses between time optimal control and bang bang control through a mode switching mechanism. II. LITERATURE REVIEW The engine parameters like speed and torque are controlled during the gear shift process to improve shift quality and to reduce fuel consumption. Different methods are proposed for the optimal control of gear shift in automated manual transmissions. Luigi Gilelmo et. al. in Ref [7] proposed a gear shift control strategy in which a controller is designed through a hierarchical approach by discriminating among five different AMT operating phases: engaged, slipping-opening, synchronization, go-to slipping, and slipping closing. The control schemes consist of decoupled and cascaded feedback loops based on measurements of engine speed, clutch speed, and throwout bearing position, and on estimation of the transmitted torque. Magnus Petterson et. al. in Ref [2] put forward a method of gear shifting by engine control. In this the emphasis is given to minimize the total time needed for a gear shift, but when doing so driveline resonances may be excited. This in turn may lead to problems with disengaging the old gear and synchronizing speeds for engaging the new gear. Internal driveline torque control is a novel idea for handling resonances and increasing shift quality. By estimating the transmitted torque and controlling it to zero by engine control, the gear can systematically be disengaged with minimized driver disturbances and faster speed synchronization. In this a PID controller is designed to control the drive shaft torsion and to damp the driveline resonances. Viet Ngo et. al. in Ref [9] suggested a design method for energy management strategy to explore the potential fuel saving of a hybrid electric vehicle (HEV) equipped with an automated manual transmission. The control algorithm is developed based on the combination of dynamic programming (DP) and Pontryagin’s minimum principle (PMP) to optimally control the discrete gearshift command, in addition to the continuous power split between the internal combustion engine and the electric machine. Zaimin Zhong et. al. in Ref [3] put forward that in automated mechanical transmission the shift quality can be significantly improved by means of the control of the engine speed. The engine speed control is be divided into upshift control and downshift control. During up-shift, the Bang-Bang algorithm and PID algorithm are integrated. During downshift, the PID control algorithm alone is used. G Kong et. 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. To realize accurate engine speed control, a combined control algorithm based on feed-forward, bangbang and PID control is adopted. Additionally, an optimized closed-loop position control algorithm based on LQR is proposed for the shift actuators. III. MOTIVATION AND OBJECTIVE The objective of the AMT is to automate the clutch and gearbox to increase driver comfort. With this approach the clutch is replaced by engine control. It is also necessary to control the engine speed and torque during shift process to reduce fuel consumption, engine noise, shift jerk, and clutch friction work. By the implementation of automated clutch, the service lives of the clutch components are lengthened, while fuel consumption and the associated CO2 emissions can be reduced. It is crucial to control engine parameters during the gear shifting process of AMT for the purpose of reducing fuel consumption, engine noise, shift jerk and clutch friction work. The main objectives of the project are,

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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