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SUVs Ford Freestyle Ford Freestyle CVT Transmissions
207 messages, Last post on Dec 03, 2009 at 1:19 PM
You are in the Ford Freestyle Forum. Your Hosts are steve_ & tidester
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Replying to: tidester (May 01, 2008 8:18 pm) I've had partial differential equations. Here's my summary of engineering mathematics: Calculus 1: Anything can be differentiated (OK, the function has to be smooth and continuous) Calculus 2: A lot of things can be integrated, though it's helpful to know which trick to apply when Calculus 3: You can do some neat volume calculations with integrals Differential Equations: Some of these are actually solveable. Laplace who? Partial DiffEq: Hey, we can solve about 4 of these.  tensor analysis and point set topology I'll leave that (along with proving that 1+1 = 2) to the math majors. 
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Replying to: steve_ (May 02, 2008 9:46 am) You just don't FEEL it, because it happens in such tiny increments. If there were no shifting, you'd always be in the same gear (ratio). The marketing people have figured it out - since many people expect their cars to "shift" some CVT transmissions have been configured to simulate shift points and bumps to reassure those drivers. Always the IDIOTS who don't understand the concept at ALL. The whole POINT of a CVT is that you don't have to FEEL the shifts, dangit! Besides, didn't Nissan have a commercial that extolled the benefits of the CVT in the Murano? Something with a woman trying to put on lipstick or something, waiting for the "shifts" before she could start?
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Replying to: stmss (May 02, 2008 10:02 am) It doesn't ?!?!?!? Fly-by-wire is nice! |
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Replying to: barnstormer64 (May 02, 2008 3:49 pm) Engineers always break things down into black/white, on/off, yes/no. Some of us view everything as shades of gray along a continuum. A handy word for a CVT, no gear of which can be distinguished from neighboring gears except by arbitrary division (to slaughter the definition a bit ).
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Replying to: barnstormer64 (May 02, 2008 3:46 pm) I wouldn't let a math major anywhere near my car!  Who would ever have thought that we would get stuck on the semantics of "continuously variable" in an automotive discussion? I think we all know what it means. I'm sure there's a joke in there somewhere starting with "A mathematician, an engineer and a physicist are examining a CVT ..."  tidester, host SUVs and Smart Shopper |
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Replying to: tidester (May 03, 2008 12:22 am) where's vad or albook when you need them, we'll get to the bottom of this??? lol I'm sure there's a joke in there somewhere starting with "A mathematician, an engineer and a physicist are examining a CVT ..." pass out the pocket protector's already... |
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Replying to: steve_ (May 02, 2008 9:20 pm) But that's the easy way to think of it . . you just keep making the pieces smaller and smaller and smaller . . . . until you "approach the limit" of infinitely many infinitesimal pieces. Some of us view everything as shades of gray along a continuum. A handy word for a CVT, no gear of which can be distinguished from neighboring gears except by arbitrary division (to slaughter the definition a bit I'd say we're close enough, considering it took mathematicians about 150 years to precisely define what Leibniz and Newton came up with when they "invented" the calculus. Or should we define it more properly, like "for any given ratio epsilon, there exists a delta that blah blah blah blah . . "
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Replying to: tidester (May 03, 2008 12:22 am) I think it's a bit more than semantics, though, when somebody says the CVT "doesn't shift". That's NOT the same thing as you can't FEEL it shift. They remind me of Zeno (ancient mathematician) who had several paradoxes. One of which was that an arrow in flight can't really be moving because at any moment in time, it is "frozen" at that position, thus proving it's not moving. The very fact that the CVT can go from a minimum (gear) ratio to a maximum (gear) ratio means that is MUST "shift" (change) from one (gear) ratio to another. Even if you have a hard time telling it. Actually, I submit that you CAN tell it, because the rate at which the gear ratio changes in a CVT is somewhat proportional to how hard you're pressing on the gas pedal. |
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Replying to: tidester (May 03, 2008 12:22 am) To the optimist, the glass if half full To the pessimist, the glass if half empty To the engineer, the glass is overdesigned.
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Replying to: barnstormer64 (May 03, 2008 6:09 pm) George Carlin agrees: “Some people think of the glass as half full. Some people think of the glass as half empty. I think of the glass as too big.” tidester, host SUVs and Smart Shopper |
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