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Klean Diesel Kaput

Discussion in 'Diesels' started by bwilson4web, Mar 3, 2010.

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  1. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Mainstream Prius has sold in millions and you can not compare the cost with it.

    Diesel PHV would still need expensive emission control. Making it a hybrid does not necessarily make it cleaner when the Diesel engine is running.
     
    #101 usbseawolf2000, Mar 13, 2010
  2. bwilson4web

    bwilson4web BMW i3 and Model 3

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    The hybrid drive could ease some of the diesel emissions challenges by avoiding the worst regions. Derating the diesel is possible because the hybrid drive can provide surge power and avoid inefficient diesel regions. But getting the right mix will be tricky.

    Bob Wilson
     
    #102 bwilson4web, Mar 13, 2010
  3. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Is Atkinson cycle possible in Diesel? I mean keep the compression ignition but it would have the expansion ratio higher than the compression ratio. More work can be extracted out of the fuel.

    The compression will be lower due to late closing of the intake. Will that reduce the Diesel thermal efficiency due to lower compression?
     
    #103 usbseawolf2000, Mar 14, 2010
  4. ems1

    ems1 New Member

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    Low compression and diesel is not a good mix unless you are going for a competition only type vehicle
     
    #104 ems1, Mar 14, 2010
  5. qbee42

    qbee42 My other car is a boat

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    With diesel you already have a long power stroke, due to the long compression stroke.

    Tom
     
    #105 qbee42, Mar 14, 2010
  6. Flying White Dutchman

    Flying White Dutchman Senior Member

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    so these urea injects do not need a PDF or EGR?
    or have those cars al of them?
     
    #106 Flying White Dutchman, Mar 14, 2010
  7. seftonm

    seftonm Member

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    All diesel cars here have a DPF and EGR. The DPF is for reducing particulates, while urea and EGR are to cut NOx. Using urea means less EGR is needed, which leads to fewer fuel consuming DPF regenerations.
     
    #107 seftonm, Mar 14, 2010
  8. durallymax

    durallymax Member

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    ^^^ exactly.

    Lowering a diesels compression ratio probably won't work well. Diesels rely on heat to create combustion, lower the compression ratio and you will loose that heat.

    The new wave of piezo injectors allows the engines to burn all of the fuel an eliminate inefficies and emissions even further.
     
    #108 durallymax, Mar 15, 2010
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