Experimental validation for the employment of shifting strategies optimized via i-AWGA in a gear shift indicator system for manual transmission vehicles
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In the present work, a computational routine was developed in order to optimize the shifting strategies implemented in a Gear Shift Indicator to assist the driver of manual transmission vehicles according to a desired driving style. In order to achieve this goal, a simulation algorithm was developed to estimate the fuel consumption and acceleration performance of a vehicle equipped with a 5-speed manual gearbox propelled by a 1.4 L engine when submitted to the FTP-72 driving cycle. A multi-objective Genetic Algorithm was then employed to solve the optimization problem for both fuel consumption and performance. Among the set of optimized solutions, 3 shifting strategies were selected for experimental evaluation on a chassis dynamometer. The experiments showed that the strategy with focus on fuel economy was able to save 10.7% of fuel, being the best performance strategy responsible for enhancing the vehicle acceleration in 8.33%, when compared to the standard strategy provided by the vehicle manufacturer. Finally, the best-compromised solution presented 6.4% fuel-savings with an acceleration performance similar to the best performance strategy.Keywords:
Driving cycle
Manual transmission
Chassis
Automatic transmission
Dynamometer
Replicate
Performance indicator
A lightweight electric vehicle equipped with an automatic–manual transmission offers many advantages in terms of the transmission efficiency, the improvement in driveability, and the shift quality. A conventional automatic–manual transmission for a vehicle powered by an internal-combustion engine requires an electronically controlled clutch to isolate and engage the engine power for smooth gear changes, because of the high inertia of the internal-combustion engine. This makes the system complicated and, therefore, more expensive. Hence, a clutchless automatic–manual transmission with the advantages of a high efficiency, a low cost and a simple structure was adopted and developed in this paper. This study is focused on exploring the feasibility of a clutchless automatic–manual transmission adopted in an electric vehicle and proposes a gear-change control technique for a clutchless automatic–manual transmission, which includes identification of the model parameters, control of the synchronization speed during gear engagement, and motion control of the gear-change actuator mechanism. Theoretical analysis, simulation and experiment confirm that the designed control technique is able to achieve smooth gear shifting. Therefore, the feasibility of a clutchless automatic–manual transmission is verified.
Automatic transmission
Manual transmission
Transmission system
Automatic control
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This paper focuses on fuel economy and acceleration performance of vehicle using powertrain dynamometer with road load simulator. The engine and transmission are equally controlled to vehicle by configuration which is equipped with real engine, real transmission with torque convertor and throttle actuator and so on. It is easy to find the effect of road load and shift pattern of auto transmission on powertrain dynamometer by eliminating driver variables of vehicle and real road. All of boundary conditions except road load or shift pattern is surely kept to analyze clearly the effect of road load or shift pattern. After testing, it is possible to easily compare results of fuel economy and acceleration performance with all kinds of combinations. This test method which uses powertrain dynamometer is allowed to shorten the development time without vehicles.
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Manual transmission
Throttle
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Due to the increase of the oil price, the needs for the fuel efficiency improvement of the vehicles are growing and as environmental problems like CO₂ emission be issues, many automotive companies have developed various new technologies to deal with those issues. Automated Manual Transmission(AMT) is one of those technologies. AMT, based on conventional manual transmission, uses various control units and actuators to automate the clutch actuation and gear shift. As manual transmissions main clutch is applied to supply the power from the engine to transmission, compared to the torque converter applied to automatic transmission, AMT improves fuel efficiency and has better responsibility due to the varied shift mode. Also comparing to automatic transmission, it provides the same ease. This paper is to analyze heavy duty track applied AMTs structure, performance characteristics, automated shifting. And compare the data from real vehicle experiments to study the responsibility of shifting control and stability.
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A description is given of the development of a control system which converts a standard truck transmission to fully-automatic operation without need for a clutch pedal or conventional gearshift lever. The reasons why the researchers chose to automate a manual transmission with existing hardware are listed. A diagram showing how the clutch assembly is used with the automated system is presented.
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This article describes gearshift control strategies developed for a series-parallel hybrid electric vehicle architecture in which an electric machine is connected to the output of the transmission, thus obtaining torque filling capabilities during gearshifts. Two transmission systems are analyzed: hybrid automated manual transmission and hybrid dual-clutch transmission. The article focuses on the gearshift control strategies for the two transmission, splitting each gearshift into several phases. The objectives of each control phase, the equations for computing the set points for powertrain actuators, and the conditions that determine the passage from one shifting phase to the next are reported. Moreover, nonlinear dynamic models are described and used to verify through simulation the effectiveness of the controllers. Promising results, in terms of vehicle dynamic performance, are obtained for both transmission systems.
Powertrain
Manual transmission
Automatic transmission
Torque converter
Continuously variable transmission
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With the development of automobile industry, automobile residents of automobile and technology. The proportion of simple operating automatic transmission cars is also getting much more, called the first choice for more families. However, there is still a certain gap between reliability, service life and fuel consumption compared with the manual transmission. At the same time, the power response and driving pleasure reflected by manual transmission cars in driving are also irreplaceable by automatic transmission cars. However, manual transmission semi-linkage control in the process of shift is often difficult to master. In this paper, for the control of semi-linkage, we put forward a manual transmission car clutch semi-linkage automatic control mechanism to solve the frustration in the process of shift, make driving more smooth, reduce fuel consumption, reduce gear wear and tear, and extend the service life of the transmission.
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Automatic transmission
Linkage (software)
Continuously variable transmission
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With the rise in oil prices and ongoing concerns about environment, there is an increased amount of interest in automated manual transmission (AMT) vehicles. Torque control in an AMT vehicle is attained by controlling the displacement of the dry-type clutch's actuator. To provide good ride comfort akin to that of an automatic transmission vehicle, the clutch control is vital to an AMT vehicle. In this study, a method of obtaining the clutch torque from a dynamometer test is devised. This method is able to identify the relationship between the displacement of the clutch actuator and the clutch torque. A simulator for estimating the performance of an AMT vehicle is developed using MATLAB Simulink. The results obtained from both the vehicle and simulation exhibit a similar trend.
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Manual transmission
Automatic transmission
Torque converter
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Automatic transmission
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State-of-the-art commercial vehicle powertrain concepts with automatic transmission must comply with inceasingly stringent legislation on emission and fuel consumption while fulfilling or surpassing customers’ expectations as to driveability. In this respect, automated manual transmission (AMT) for commercial HEV, that is kind of shift-by-wire system, must compete with conventional automatic transmissions (AT) and manual transmissions (MT). In this paper, optimal analysis parameters which suppress deviation and error are sought Taguchi methodology for gear-actuator of automated manual transmission for commercial HEV.
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