Re: Lets talk next generation diesel

Posted by Ron Sa on January 14, 2017 at 09:13:52 from (75.105.128.37):

In Reply to: Re: Lets talk next generation diesel posted by David G on January 13, 2017 at 07:26:12:

David, Your terminology "bug the snot out of me" says a lot. You no doubt realize that what we use to call the "gas pedal" is actually a
speed request pedal. It is connected to a computer and the computer has a procedure to do what is requested--either more speed or less speed.

For speed decrease requests, safety is the main concern. Fortunately, safety and low emissions go hand in hand so the fuel rate can be reduced immediately. For speed increase requests, emissions override our desire for the engine to bark.

I had to get use to the delay in the start switch. When no immediate response happened, I would immediate release the key and begin looking for reasons---must be in gear etc. Try again--immediate release--keep looking for WHY? My experienced co-driver told me politely "just HOLD the key at start". Yes, this old dog did learn the new trick. sigh!!!!

Controlling emissions is easier if the diesel engine does not need to increase RPMs. Currently, transmissions cannot efficiently and smoothly manage our speed increase requests. Speed decrease requests could currently be handled by going to neutral and let the engine "continue to rev" and downshift to match. Unfortunately, doing this could have safety issues when some of us old dog drivers react by reaching down to pull back on the gas pedal.

As us old dogs loose our CDL for medical reasons (as I did), I predict there will be more "keeping the engine revved" and controlling speed requests with the transmission. For trucks, the engine will probably need to be kept near low idle speed only to get rolling--up to a MPH in low gear that matches the engine's rpm sweep spot. Beyond that mph, the engine is likely to be kept revved and the tranny shifted as needed to meet the speed request.

Of course, infinitely variable trannys in trucks, or powers shifts, are not yet as efficient as the computerized clash box. To keep the computerized clash box for fuel economy, the computer will have to decide the best COMPROMISE of gear ratio and engine speed to main specific speed requests to deal with traffic and other things.

Drivers and the pedestrians may have to get use to "racing truck engines" as they approach stop signs etc. Since pedestrians are voters, the Feds may allow computers to "predict city driving" and modify how truck engines are controlled during city driving. GPS locations (city limits) might give instructions/permissions to the computer to control the engine in a different manner.

Truck drivers may have to get use to the various "temper tantrums" of the beast they are driving. LOL.

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