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  1. Xplode

    VDI 2198 Driving Cycle

    Could someone provide me with some more information on the VDI 2198 driving cycle? What is the trajectory to be driven? For a standard test, how many cycles should be performed? Thanks in advance. Xplode
  2. Xplode

    Closed Loop Test - Data Analysis

    First of all, thank you Bribyk for the useful tool! I can conclude the simulation process is very helpful, as long as you have an appropriate and good model of the data. Are there any system identification tools or techniques that are particularly useful or which result in high correlation? I...
  3. Xplode

    Closed Loop Test - Data Analysis

    I also thought about building a model and using simulations to match the model to the real world vehicle behaviour, but I was still thinking about the necessary complexity of the model. Do you use a full multi-body-model or a simpler, mathematical model? Have you compared your simulation...
  4. Xplode

    Closed Loop Test - Data Analysis

    I'm sorry, I forgot to mention the data channels. The data acquisition system measures: - vx - ax - ay - steering wheel angle and torque - body motions: pitch, yaw and roll - slip angle - ... Currently I was examining the results of steering wheel angle vs. lateral acceleration, as an example...
  5. Xplode

    Closed Loop Test - Data Analysis

    In examining the possibilities of closed loop data analysis, the focus is on steering and the appropriate manoeuvres: constant radius turn, constant velocity sweeping steer manoeuvre for different lateral acceleration levels,.. The closed loop data is acquired from test runs on a handling...
  6. Xplode

    Closed Loop Test - Data Analysis

    When testing the dynamic behaviour of a vehicle, you have two options: - Open loop test: The whole test procedure is precisely determined (speed,steering wheel angle build up,..) The driver is not part of the information loop and so there is no feedback. - Closed loop test: The test driver...
  7. Xplode

    Turbocharger: transient behaviour

    Thanks for the help! I don't have any experience with turbocharging, but we're planning a research where they might appear as a solution. Trying to get it all clear, I asked myself some questions and got a clarifying answer now. Thanks Regards
  8. Xplode

    Turbocharger: transient behaviour

    Dear, I have a question regarding the transient behaviour of a turbocharger. Are the following reasonings correct? 1) Assuming the engine is working at constant torque and you want to increase the engine speed. I thought, first of all, you increase the air-fuel-ratio. This causes an increase...
  9. Xplode

    Exhaust valve timing: rpm dependency

    I have a question regarding the timing of closing the exhaust valve. From a P-V diagram, you can see that closing the exhaust valve too early would raise the exhaust pressure, causing higher pump losses, or in other words decreasing the internal efficiency. A part of the exhaust gases remains...
  10. Xplode

    Fundamental explanation for different torque curve SI-CI

    Thanks for the explanation. I understand that the ignition delay of CI engines limits the amount of fuel that can be injected for a fully completed combustion at high engine speeds. This causes the torque curve of CI engine to drop faster than that of a SI engine at high engine speeds. But...
  11. Xplode

    Fundamental explanation for different torque curve SI-CI

    Diesel engines reach their maximum torque at lower engine speeds than SI engines. What is the fundamental explanation for this difference? Is it just because a diesel is built heavier than a SI engine? Or is it caused by the different combustion? What happened to the "SI vs CI" thread that is...

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