## Torque converter model for simulation

## Torque converter model for simulation

(OP)

Does anybody have informations about a torque converter model for simulation:

- equations

- valid parameters

I'd like to simulate an automatic gearbox.

- equations

- valid parameters

I'd like to simulate an automatic gearbox.

## RE: Torque converter model for simulation

## RE: Torque converter model for simulation

I might be able to help more if you described exactly what you want the model to accomplish.

I am not an automotive engineer, so hopefully if I have given you erroneous informantion someone will correct it.

## RE: Torque converter model for simulation

## RE: Torque converter model for simulation

## RE: Torque converter model for simulation

for a two wheeler , if u can tell whether u are going stepup

or down may be i can help u

## RE: Torque converter model for simulation

Stall speed 2000 rpm

Torque multiplication max 2.2 - more like 2 for practical use

Speed at which input speed=output speed (as near as makes no difference) 2600 rpm

We also have a lockup clutch which independently locks the torque converter out.

Having a dig around on the web I can find no open source data that really gives more than that. It is very complex - mapping a torque converter gives a whole bunch of graphs.

Cheers

Greg Locock

## RE: Torque converter model for simulation

- equations

- valid parameters

I'd like to simulate an automatic gearbox.

==================================================

I've developed a couple of computer programs that

have a "Torque Converter Model" in them .

One program..you input HP, ETC and get ET/MPH GForces, ETC each and every foot distance with torque converter

Slip/LockUp % , and torque multiplication values

...the other program goes the opposite way,

you input 60,660,1320 Ft ET and get HP/Torque , ET, MPH, GForces,Aero, Rolling Resistance Losses, ETC each and every foot down 1/4 mile

The "Torque Converter Model" must be very close to real-world because it models in accuracy to .001 thousandths or better most of the time ...howvere , one program version

requires the user to know the max-torque converter multiplication value ..the other program version,

the program "guesstimates" that for you very accurately

Larry Meaux (meauxrace2@aol.com)

Meaux Racing Heads

MaxRace Software

ET_Analyst for DragRacers

## RE: Torque converter model for simulation

(Impeller) = 1800 rpm

Turbine Shaft Torque LockUP

Speed RPM Multiplication Efficiency %

zero 2.25:1 0.0%

175 2.1:1 20.0%

350 2:1 40.0%

600 1.8:1 60.0%

950 1.5:1 80.0%

1350 1.1:1 85.0%

1500 1.05:1 90.0%

1800 1:1 100.0%

you can use a Quadratic Curve Fit equation like

Y = A + B * X + C * X ^ 2

where Y = Torque Converter multiplication

and X = LockUp percent in whole numbers

A=2.226194744185

B=-.0009012975

C=-.000122745

I use different Curve Fit equations in my program but this will get you within .01 to .001 thousandths of a second

accuracy in acceleration simulation .

The above data was a keypart in getting my program to correlate with real world acceleration simulation..

some of the other key parts were to compute Shift Time

and add to Elapsed Time ,,,then you have to compute losses from rotational inertia of engine and drivetrain components,

, tires/wheels ..those 3 areas finally will let your simulation correlate to real world data to within thousandths of a second accuracy

Larry Meaux (meauxrace2@aol.com)

Meaux Racing Heads

MaxRace Software

ET_Analyst for DragRacers

## RE: Torque converter model for simulation

can use in Visual Basic 1.0 to 6.0

------------------------------------------

'CCLock(Ft) is Clutch or Converter Lockup percent

' at each Ft distance

SELECT CASE CCLock(Ft)

CASE 80 TO 100

'*****Quadratic Curve Fit equation for LockUp % from 80% -to- 100%

aquad = 3.465

bquad = -.046071429#

cquad = .00021428571#

Yquad = aquad + (bquad * CCLock(Ft)) + (cquad * CCLock(Ft) ^ 2)

TorqMultiply = Yquad

CASE 79 TO 80

'Linear Fit: y = a + bx

ALinear = 30.591

BLinear = -.368

Ylinear = ALinear + BLinear * CCLock(Ft)

TorqMultiply = Ylinear

CASE ELSE

'*****Linear Curve Fit equation for LockUp % from 0.00% -to- 79.00%

ALinear = 3

BLinear = -.01875

Ylinear = ALinear + BLinear * CCLock(Ft)

TorqMultiply = Ylinear

END SELECT

IF TorqMultiply > ConvMultiply THEN TorqMultiply = ConvMultiply

IF LockUpp = 100 THEN TorqMultiply = 1!

'---TorqMutiply will be times engine torque value

'---ConvMultiply is what the user enters for

'---maximum torque multiplication

Larry Meaux (meauxrace2@aol.com)

Meaux Racing Heads

MaxRace Software

ET_Analyst for DragRacers

## RE: Torque converter model for simulation

## RE: Torque converter model for simulation