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  • Users: Xplode
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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

    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...
  3. 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...
  4. 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...
  5. 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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