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

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

The Mighty Mopar

563 words - 2 pages would be, there Prototypes.The first of theses great and unique automobiles is the 1970 Plymouth Roadrunner with a 426 Hemi Engine and dual exhaust .Now there of course was a production of this model car for some years but it never again looked like the prototype.The prototype Roadrunner had flared rear quarters panels (Jenkins14-18). It also had one continues taillight across the back. The production model had the taillight separated with a strip of

A discursive essay on car usage

593 words - 2 pages can not get from a bus or train such as air-conditioning, seatbelts, sound systems, air bags and personal space make the car one of the most convenient ways to travel.Another key factor to the popularity of cars today is their efficiency. They are less time consuming than public transport. Cars can be fairly cheap to run especially if it is a small model and they can also get an extra two miles per gallon of fuel on average if it is a manual car

Corvette History

935 words - 4 pages produced in the 35 years of production. The first Zr-1 super performance corvette was introduced in 1990 it was equipt with a new performance pakage that increased the horsepower to 370 @ 5600rpm. The cars original engian pushed 345 @ 3200rpms which means that Zr-1 had almost doubled the torque. The price of the car caused production to be slime only 3'000 were made in 1990 and only 500 in 1992 and 1993. The production of this sporty

Alternate Summer Field

1193 words - 5 pages a shopper or a basket, play hopscotch, connecting blocks or Lego set, play a telephone game, counting the stairs, songs counting, have a treasure hunt, group effort, the hundred circle and cook with your kids (Robertson, 2006).AdditionOne of the basic concepts of maths that id taught initially in first grade is addition. The addition of integers goes all along in the ages thereafter. When the kid is provided with the head start, it is a

Cars

1759 words - 7 pages of torque, giving it acceleration from "zero to sixty in 3.4 seconds" (Daniels, 117) with a top speed ranging from about 210-225 mph. When the Model T came out it didn't have many options to choose from. Now however options are parts that make the car. Popular options for sports cars can include what kind of leather is used, color of the interior, choice of engine, wood, carbon fiber, transmission, brakes, exhaust, spoiler, and wheels. Wheels

Implementing Prognostics Within the Telecommunications Industry

1267 words - 5 pages the failures would not allow the prognostic algorithms to route the failure correctly. The authors determined that the prototyped model should be scaled down and adapted to the system to determine how to resolve the prognostic algorithms. The authors examine a specific problem that is attributed to prognostic-based electrical components. The authors have published many scholarly articles in the fields of vehicle and telecommunications

Alternate Energy Automobiles

4246 words - 17 pages a BMW, or a Lexus. The new EVs are self-sustaining, so they don’t need to be recharged like the battery-powered vehicles. Most of the new EVs are hybrid or fuel cell powered. Nearly all EVs can accelerate from 0-60 mph in a range of 8-20 seconds. However, most EVs take around 10 seconds for a 0-60 acceleration time. Most of the common electric motors create 100-140 hp with 100-150 ft./lbs of torque which doesn‘t sound like much compared to our

The world

2648 words - 11 pages applications with ratings approaching a megawatt. Electric motors may be classified by electric power source type, internal construction, application, type of motion output, and so on.Devices such as magnetic solenoids and loudspeakers that convert electricity into motion but do not generate usable mechanical power are respectively referred to as actuators and transducers. Electric motors are used to produce rotary or linear torque or force.Some

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

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

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

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