Clutch Model?

Hi I'm busy with a Master's degree in Mechanical Engineering. My thesis deals with simulating driving cycles on an engine test bench. As part thereof I have to simulate vehicle pull-away. What I want to know is whether anyone can help me here, i.e. how the torque transfered by the clutch increases during the typical pull-away of a light passenger vehicle. I do realise that this is very driver dependant (Grandma vs Schumacher) but and apart from actually measuring it myself any help will be greatly appreciated. Thanks

: Hi : I'm busy with a Master's degree in Mechanical Engineering. My thesis : deals with simulating driving cycles on an engine test bench. As part : thereof I have to simulate vehicle pull-away. What I want to know is : whether anyone can help me here, i.e. how the torque transfered by the : clutch increases during the typical pull-away of a light passenger : vehicle. I do realise that this is very driver dependant (Grandma vs : Schumacher) but and apart from actually measuring it myself any help : will be greatly appreciated. I think you need to have the torque vs rpm curve. Because the rpm is usually changing during pull-away. Variate the clutch friction factor from 0 to 1 describes how a person release the clutch pedal. You may also need to know the engine flywheel characteristic so that you know how rpm is affected when the clutch is releasing. Monitor the vehicle speed and the engine speed and compare. When they matched, pull-away process completed. However, the process will become more complex if you also consider weight transfer. FWD and RWD seems to be different here. This is just my thought. But you are a mechanical engineer, I think you are more familiar with the mathematical equations than me I think. Suggested trial method: Use GW-BASIC which supports easy programming of sound and joystick. Try to write a program which assumes 2000rpm initial, 0 mph initial, guess a torque curve and assume a value for the flywheel. Use the joystick as the clutch input, use the 'sound' commmand to output the frequency proportional to the rpm. See what happens, good luck. Bernard Shum

Quoted text (12 lines)

> Hi > I'm busy with a Master's degree in Mechanical Engineering. My thesis > deals with simulating driving cycles on an engine test bench. As part > thereof I have to simulate vehicle pull-away. What I want to know is > whether anyone can help me here, i.e. how the torque transfered by the > clutch increases during the typical pull-away of a light passenger > vehicle. I do realise that this is very driver dependant (Grandma vs > Schumacher) but and apart from actually measuring it myself any help > will be greatly appreciated. > Thanks

If you are using SIMULINK and MATLAB, you could go to the MathWorks web site www.mathworks.com. Somewhere on the site they have example SIMULINK m-files in the automotive arena. These example files include two different models of clutch dymanics. Haven't really looked at it myself, but it may be a good starting place. Good Luck -- Steve Loudon Chassis Algorithm Engineer Delphi Automotive Systems GM Proving Grounds, Milford MI

Hehe, of course this is mute, but ya could use the Clutch addition to the TSW line of wheels to test this out... of course, you'd need the right simulator to make use of it :-) bill says...