Modelling and Simulation of Automatic Transmission

Abstract

The simulation and modelling of vehicle control shift components, which take place through the gearbox of gears while deciding on the shift\'s features, is one of the many elements that determine a vehicle\'s characteristics. The efficiency of fuel combustion, the durability of the gearbox, the vehicle\'s operability, and the comfort of the driver are all factors that are impacted by modelling and simulation when used to design automobiles. This thesis uses MATLAB software to construct a model and simulate simpler models for gear-shift methods, taking into account driving variables such road slope, vehicle speed calculations, and other aspects to evaluate the gearbox system\'s behaviour. The research showed that decreasing the throttle input enhanced the engine\'s torque while decreasing its speed.

Introduction

I. INTRODUCTION

When it comes to shifting, there is currently a steady and considerable increase and improvement in the good scope for automobiles with automatic transmissions. The ability to control and handle gearbox switching components such as freewheels and clutches has a considerable impact on changeover comfort.

To do this, an Electronic Control Unit (ECU) is used (Nezhadali and Eriksson, 2015).

There are numerous automotive setups, but the "Automatic Transmission (AT)" is one of the most common. These systems use planetary gear sets to achieve several gear ratios by integrating components from different planetary gears (Yi et al., 2017).

The primary topic of this research is Matlab/Simulink transmission integration. The shifting state of the gearbox output shaft and crankshaft is determined by combining.

II. OBJECTIVE

A significant growth in legal requirements and customer concern about the automobile sector has been observed in recent years, taking into consideration the emissions created by the automotive industry.

Simulations were given an important role in the progress of the automotive sector. The programming resources, which are contained in their own packages, are generated by car makers to be utilised later for trails and testing as computer performance improves and novel modelling techniques become available.

III. LITERATURE REVIEW

1. Vishnu P. R. and colleagues (2016)[1]This approach takes time to shift gears and sometimes the gears do not mesh well, reducing the life of the gears. This automatic transmission was avoided by using pneumatic gear transmission.
2. John A Buzacott,L Eo Hanifin(2000),AIIE Transactions[2]”Models of automatic transfer lines with inventory banks a review and comparision”.
3. Gregory M Pietron,William E Tobler(2003),SAE Technical Paper,”Review of wet friction component models for automatic transmission shift analysis”.
4. Peng Dong,Yanfang Liu(2018),Automotive Innovation”Progress in automotive transmissiontecgnology”.
5. Sireesha Tamada,DebrajBhattacharjee,Pranab K Dan(2020),International journal of vehicle Performance,”Review on Automatic transmission control in electric and non electric automotive powertrain”

IV. METHODOLGY

Combustion engines operate at high speeds, which are inefficient and inappropriate for starting, stopping, or travelling slowly. The gearbox's goal is to manage the engine's speed and torque ratios, giving the car a greater range of driving options.This is referred to as overdrive because the torque can be reduced as the rpm is increased. The next two equations illustrate the obtained speed eng and torque Teng on the prop shaft about gear i with ri ratio (Guiju et al. 2014).

A. Planetary-Gear Sets

 In many other circumstances, commercial vehicle automatic gearboxes use a planetary-gear rail to switch between gear ratios. It is composed of multiple planter-gear classes as well as ordinary gears in some circumstances. The planter-gear kit is made up of three basic parts: sun-gear, earth gears, and the internal gear, as well as a planet carrier. Each of these pieces can be output, information, or constant. All components in a planetary gear set configuration, as illustrated in Figure 4, share a common rotational axis (Wendelius, 2012).

B. Automated-Manual Transmission

 This sort of gearbox, which is manual, employs a standard gear in addition to a clutch and employs actuators, sensors, pneumatics, and processors to help manual gear usage.

C. DSG(Direct shift gears)

It is similar to a dual-clutch gearbox in that it has two clutches that open interchangeably while changing ratios. It offers smooth acceleration as well as quick shifting. New systems provide more reliable fuel systems than manual patterns. This method is known as wet gearbox, and it is projected to run for decades if the fuel is supplied on a regular basis (Automatic Revolution, 2019).

D. Clutches

Although cars with automatic transmissions do not have a clutch pedal, this does not mean that no clutches are used inside the gearbox. Inside the gear train, however, multiple clutches are used. The clutch, in instance, is made up of two plates with friction plates and a technique that either slides or presses these apart. (Zhang et al., 2015).

E. Torque Converter

The torque converter is a type of hydraulic fluid connection that connects the engine flywheel to the gearbox. When the engine is driven at a low speed while travelling, the converter initially obtains a relatively limited amount of travelling torque, allowing the automobile to stop without stalling.  The stator redirects fluid as it is propelled via the impeller and decelerated through the turbine via the driving point. Despite the significant power losses, this ensures that the turbine's torque is greater than the engine's torque.

Matlab Simulink Process Flow

 A four-speed gearbox is modelled using imscape DrivelineTM. Planetary gears and clutches are used in the gearbox model. In Stateflow®, the clutch control logic is represented as a state machine. Simscape Driveline powertrain model, which includes an engine, torque converter, gears, tyres, and longitudinal vehicle dynamics, is combined with the gearbox model. The entire car is put through two drive cycles, and the simulation results are displayed in Simscape.Vehicle counting, classification, and detection are important tasks in traffic management and surveillance systems. The process typically involves the following steps:

Conclusion

There are many configurations used in automobiles, but the Automatic Transmission (AT) is among the most commonly used schemes. These systems provide terrestrial sets of the gear that achieve a variety of gear ratios by connecting various planetary gear set components. At the time of gearshift, the coupling procedure is carried out by connecting brakes as well as oil-immersed clutches, also known as change parts. Using planetary gear set mixtures during the process of transmission allows for varying gear proportion to be obtained, while transmission\'s lightweight construction allows it to be used in all standard passenger cars. In recent years, there has been a substantial and significant growth in consumer and regulatory standards pertaining to the automobile industry. Further, the new carbon dioxide emission standards, the EU and customers continue to emit NOx1 and various particulates. Simulations have recently been given an important and significant role in the growth of the automotive industry. After modelling all of the vehicle automation system\'s units, all of the parameters are varied and adjusted for the desired performance. The torque of the engine and the engine speed are then investigated, and a graph regarding the variable speed of the engine and the engine torque is formed. Depending on the findings of this thesis and the improvements that have arisen in the systems of the transmission, the following recommendations should be considered in the future: It is easy to find clutch control functions which satisfy the criteria for the comfort of the gearshift in terms of force. Since the actuators of the Hydraulic clutch are used in most automatic gearboxes, they produce extra dynamics, making the functions of the clutch control more difficult to implement. In order to solve this issue, the hydraulic regulation of the gearbox clutches should also be modelled. The measurements in the vehicle are compared with the results obtained from the simulation using MATLAB Simulink, in order to obtain a comprehensive investigation of the validity of the models that were designed

References

[1] Alf cars. (2019). Automatic transmission principle of operation. Overview of the automatic transmission. [2] Alonso, L. and Agusti, R. (2004). Automatic rate adaptation and energy-saving mechanisms based on cross-layer information for packet-switched data networks. IEEE Communications Magazine, 42(3), pp.S15-S20. [3] Auto Deal. (2019). Here are the different types of Automatic Transmissions | Autodeal. Retrieved 25 July2019. [4] Automatic Revolution. 2019. Automatic Revolution: Comparing CVT, Dual-Clutch,and Automated- Manual Transmissions. Retrieved 25 July 2019. [5] Automatic Transmission Types Explained. (2019). Automatic Transmission Types Explained: CVT, DSG, Tiptronic, Dual-Clutch, Automated-Manual Transmission - CAR FROM JAPAN. Retrieved 25 July 2019 [6] Flamang, P. and Smook, W., Hansen Transmissions International NV. (2005). Dry sump lubrication system with removable oil reservoir for wind turbine gearbox. [7] Florencio, D.G., Assis, E.R. and Amendola, C.H.F. (2004). The Manual Transmission Automated- Gearshift Quality Comparison to a Similar Manual System (No. 2004-01-3363). SAE Technical Paper. [8] Gong, J., Zhao, D.X., Chen, Y. and Chen, N. (2014). Study on shift schedule saving energy of automatic transmission of ground vehicles. Journal of Zhejiang University-SCIENCE A, 5(7), pp.878-883. [9] Guiju, Zh. And Caiyuan, X. (2014). Application of Pro/E in Modeling of Tracked Vehicle Transmission System, Measuring Technology and Mechatronics Automation (ICMTMA). [10] Gustafson, A., Schunnesson, H. and Kumar, U. (2015). Reliability analysis and comparison between automatic and manual load haul dump machines. Quality and Reliability Engineering International, 31(3), pp.523- 531. [11] Jiffy Lube. (2019). What the transmission does and why it is important to maintain. - Jiffy Lube California. Retrieved 25 July,2019 [12] Lemmers, G.C. and Behling, D.S., Hamilton Sundstrand Corp, 2011. High to low-pressure spool summing gearbox for accessory power extraction and electric start. U.S. Patent 7,882,691. [13] Mathwork. (2019). Modeling an Automatic Transmission Controller [14] Mech study. 2019. What is Automatic Transmission : Principle and Working - mech4study. Retrieved 25 July2019 [15] Mechanical Booster. (2019). How Automatic Transmission Works? - Best Explanation Ever - Mechanical Booster. Retrieved 25 July 201 [16] Nezhadali, V. and Eriksson, L. (2015). A framework for modelling and optimal control of automatic transmission system. IFAC-Papers Online 48-15 (2015) 285–291 [17] Pohl, B. (2003), „Transient Torque Converter Performance, Testing, Simulation and Reverse Engineering?, SAE Paper, 2003-01-0249. [18] Sudha, M.N., Valarmathi, M.L. and Babu, A.S. (2011). Energy-efficient data transmission in an automatic irrigation system using wireless sensor networks. Computers and Electronics in Agriculture, 78(2), pp.215-221. [19] Taguchi, Y., Soga, Y., Mineno, A., Kuzuya, H., Horiuchi, I., Ueda, Y. and Miyazaki, T., (2003). Development of an automated manual transmission system based on robust design (No. 2003-01-0592). SAE Technical Paper. [20] Tobola´?r, J. Otter, M. and B¨unte, T. (2017). Modelling of Vehicle Powertrains with the Modelica PowerTrain Library, The Modelica Association and Linkoping University. [21] Wendelius, L. (2012). Development of a Simulation Model of an Automatic Gearbox, Umeå University. [22] Yi, J., Wang, X.-L., Hu, Y.-J., & Li, C.-G. (2017). Modelling and simulation of a fuzzy controller of automatic transmission of a tracked vehicle in complicated driving conditions. Journal of Automobile Engineering, 221(10): 1259–1272. [23] Zackrisson, T. (2013). Modeling and simulation of a driveline with an automatic gearbox, Kluver Academic Publishers. [24] Zhang Y, Chen X, Zhang X, Jiang H, and Tobler W. (2015). Dynamic Modeling and Simulation of a Dual- Clutch Automated Lay-Shaft Transmission. ASME. J. Mech. Des. [25] Zhao, S. (2013). Modeling and Simulation of the Automatic Transmission Assembly Using Matlab/Simulink, Applied Mechanics and Materials, Vols. 291-294, pp. 2287-2290

Copyright

Copyright © 2023 Thuvaraga Pandi S, Joshua V, Surya S, Vishnurameshkumar R. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.