Maths Model Of Torque Converter Essay

4187 words - 17 pages

1
Math-based Torque Converter Modelling to Evaluate Damping
Characteristics and Reverse Flow Mode Operation
This paper presents math-based torque converter modelling and simulation in both forward flow mode and reverse flow mode operations. Since, a torque converter plays an
important role in transferring power from an engine shaft to the transmission shaft and
vice versa and affects the fuel consumption and vehicle longitudinal dynamics, simulating
the dynamic behaviour of this component in different operating modes is of great
importance. Our torque converter model is validated with the experimental results of the
Honda CRV during the forward flow mode operation.
The main focus of this research is on reverse flow mode simulation, and the application
of the proposed math-based torque converter model to evaluate damping characteristics of
a torque converter due to undesired disturbances generated either from engine pulsations
or from road bumps and potholes. The simulation results show that a torque converter
efficiently damps high frequency disturbances introduced from engine shaft to the
transmission side and vice versa.
Keywords: torque converter; powertrain damping; reverse flow mode;
frequency response
1. Introduction
In an automobile with an automatic transmission, instead of a mechanical clutch, a torque converter (a type of fluid coupling) can be utilized to transmit the engine‟s power. The major roles of a torque converter are multiplying torque generated by the engine, absorbing torsional vibration of the engine and
powertrain, and smoothing out the engine rotation [1].
The torque converter includes three rotating elements: the pump (impeller), the turbine, and the
stator (Figure 1). The pump is attached to the engine shaft, which is called the prime mover, and the
turbine is connected to the transmission shaft. The stator, which is placed between the pump and the
turbine, redirects the returning fluid from the turbine to the pump. A one-way clutch is used along with
the stator to either lock or unlock the stator depending on the fluid direction (whether it hits the front or
back of the stator‟s vanes). In modern automatic transmissions, a lock-up clutch is also implemented in the torque converter
to lock the engine and the transmission shafts at higher gear ratios. The torque converter‟s pump and turbine shafts are mechanically connected via the lock-up clutch at higher gear ratios (e.g. gear ratios = 3
and 4) to improve the fuel economy and enhance the efficiency.
Figure 1: Cross section of a torque converter

2
The torque converter‟s operating modes (during forward operation) can be explained by using the "coupling point", which is defined based on the stator‟s torque. In the torque multiplication range, below the coupling point, the stator is fixed by the one-way clutch and its rotational speed is zero. In the
coupling range, which happens after the coupling point, the stator freely rotates and the...

Find Another Essay On Maths model of torque converter

automotive technoloogy Essay

1542 words - 7 pages force applied at a distance from the pivot. Torque is the twisting force that causes rotation in an automobile (Young, Bennet, 2000, n.p.). Current Event After that, in a hybrid electric vehicle the battery, super capacitor, and flywheel allow the capture and release of energy during startup or braking. A bidirectional multi-port converter can contain those energy storages and sources to combine the vehicles advantages (Kolyubin, Duarte, Hendrix

Building an Induction Motor Essay

2561 words - 11 pages stator, the end of these windings are brought out (See Fig.5) and connected to three parallel rings mounted on the shaft while on each ring there is a brush placed on it (Three Phase Induction Motors, 2011). Other Components for Construction: The Shaft: This shaft is to transmit the power or the torque needed and usually it made of steel. Bearings (End Rings): Those bearings are to hold the rotor on the shaft while rotating. Fan: The

Physics Behind Modern 4 Stroke Engines

2341 words - 9 pages Torque. Engine output is measured in two ways. The first is a direct measurement of engine output: Torque. Torque is defined as the amount of mass that can be lifted a certain distance from the center of rotation (measured in LB-FT in America and N-M in the rest of the world). Torque is what accelerates a car. It is what pushes you back into your seat when accelerating. The second way output is measured is in Horsepower (horsepower

Automotive Technology

719 words - 3 pages of speed and torque from the flywheel using something called gears. A stopped automobile needs an enormous amount of torque in order to start moving. To illustrate, the first gear allows the greatest torque to start moving an automobile. However, the first gear has a disadvantage of speed since it requires high torque. (Depcik, Heitmann, 2013, n.p.) After that, in a hybrid electric vehicle the battery, supercapacitor, and flywheel allow the

The Use of Light as a Communication Media: China Great Wall

860 words - 4 pages advantages of OFDM against optical channel dispersion was not recognized in optical communication until 2001, when OFDM to combat model model dispersion in multimode fiber (MMF). A clear understanding of the unique optical channel or optical system make possible the most efficient design of the CO-OFDM system. Coherent optical OFDM (CO-OFDM) represents the ultimate performance in receiver performance, spectral efficiency, robustness against

Tuned Port Injection in General Motors Vehicles

2707 words - 11 pages the CTS is simple in terms of operation, its accuracy is absolutely critical to the proper operation of the engine. Everything from air/fuel mixture to torque converter lockup is controlled to some extent by the CTS. In fact, many engines will not even start if the CTS is disconnected. While the ECM will display a check engine light if the sensor readings are out of range, the CTS is the ECM's only source for coolant temperature information. In

GM Powertrain Case Study

1042 words - 4 pages Issues About PowertrainHigh capital investment plant and facilities with highly specialized products, the TCC (Torque Converter Clutch) with high investment in improvement plans.-New "cell" in the assembly area is the proposed model. There is a lot of resistance to this model from the employees and from the Union structure to support successful transition and cost cuts in the operation.Definitely the human resources factors have a key influence

How to Replace a AOD with a Ford T5 Transmision

1849 words - 7 pages the AOD Jack up the car as high as you can. Disconnect the battery Remove the H-pipe. Remove the driveshaft. It would be a good idea to plug the tail end of the transmission with another driveshaft yoke to prevent fluid spillage. Remove the inspection plate in front of the transmission. Unbolt the torque converter from the flex plate. Use a socket/extension/ratchet on the harmonic balancer bolt to help turn the motor to get

Novel Reduced Switches Single-Phase to Three-Phase On-line Uninterruptible Power Supply

2829 words - 11 pages , power flow through the rectifier and inverter even during the standby mode means higher power losses and lower efficiency compared to passive-standby and line-interactive UPS systems. Another important feature of the online topology is the decoupling of the input from the output, which allows converting single-phase to three-phase UPS [5]. In view of the machine efficiency, power factor, and torque ripples, a three-phase induction motor is

PV-STATCOM AND TOTAL HARMONIC DISTOTION ANALYSIS

2049 words - 8 pages connected in series are 20 and in parallel model are 20. By utilizing the default values, the final output of the 400 module is 260 kilo-watt. DC–DC converter DC-DC converter is utilized for Maximum Power Point Tracking (MPPT) by controlling the voltage across the DC link capacitor and the PV array. The buck converter is utilized when the PV voltage is higher than the battery voltage; the boost converter is utilized when the PV voltage is lower than

Electronics and Communication Engeineering

952 words - 4 pages introduced me to Op-Amps and their various applications like current sensing, comparators, clock generators and as compensators which are found in almost every power converter circuit. In my fifth semester the courses on Control Systems has turned out to be crucial to my understanding of power systems. Control Systems introduced me to frequency domain design and analysis of systems with the course covering Bode plots, Nyquist plots, and compensator

Similar Essays

Modelling Torque Converters Essay

3503 words - 14 pages converter model that is able to capture both transient and steady-state characteristics. The torque converter is connected to a mean-value engine model, transmission model, and longitudinal dynamics model in the MapleSim environment, which uses the advantages of an acausal modeling approach. A lock-up clutch is added to the torque converter model to improve the efficiency of the powertrain in higher gear ratios, and its effect on the vehicle longitudinal

Dc Dc Converters To Suitable Applications Of Coil Gun

3649 words - 15 pages DC DC converter to suitable application of coil gun. In this project, the DC converters have different type and characteristics. That is introducing four types of them namely, Buck, Boost, Buck-Boost and Cuk converter were studied and compared. In design 4A, implement the circuit of high voltage DC DC boost converter was simulated using the PSIM software. The PSIM software is widely adopted in universities, consultants, research centers, companies

Stand Alone Renewable Hybrid Energy System

876 words - 4 pages Figure 3-1 shows a schematic diagram of a typical hybrid wind–diesel generation system. The main components of a hybrid wind–diesel power generation system are: wind turbine with associated controls, diesel engine; electrical generator with power electronic controllers (PEI), loads and bidirectional power electronic converter. Wind turbine The wind turbine should be capable of capturing maximum energy by Maximum Power Point Tracking (MPPT

Speed Control Of Linear Induction Motor

2172 words - 9 pages until the halt simulation function stops the execution programmatically and place all simulation functions within a control and simulation loop or in a simulation subsystem. Plots a value versus the simulation time on a waveform chart of input voltage. SimEx AC Squirrel Cage Induction Machine Model, Preset the 60hz of frequency for Simulation AC Induction Machine Model, during turning a knob to 0.85, it can be obtained the output waveform