A lot of emission problems with the diesel are we operators had manual control of the throttle. Many of us liked the feeling of being "in charge" of the vehicle's engine. Now, computerized fuel injection overrides the operator's input and no black smoke during speed changes. It took a few years to get over the fact that the engine would not "bark" when we mashed the gas. This dog doesn't hunt.
The piston engine tends to have a low emissions, high efficiency "sweet spot" for each power output ask for. For vehicles, the throttle is likely to disappear. Many of us old geezers will not be happy with how fast, how slow, or how much lug the engine is operating under. I drove a modern semi truck for a few years. I had become comfortable with big diesels running around 2000 rpm. I thought that lugging under 1800 was "hard on the engine" so that was my down-shift point. Same with my farm tractors.
The last big truck I drove was "computerized". About 1400 rpm max at full power and lugged down to about 1000 before computerized down-shifting--GOOD GRIEF!!!!! My perception was the engine was being SEVERLY abused.
Some of the other older drivers had the same perception. My guess is many younger driver have no concept of the inner working of an engine and sevear lug is just louder noise. That is okay. I have little concept of how the innards of this computer in front of me work and that is also okays.
The engine is becoming totally integrated with the vehicle. The start switch use to start only the engine. I think soon "saying start" will energize the entire vehicle for operation and computers will run the engine at its "sweet spot". Engines are being shut off at stop lights and then can instantly crank and go to max power when the light turns green--and shut off at the next stop light-- GOOD GRIEF--what became of warm up and cool down periods? You can tell I am old when I use the word crank to start an engine.
I was blown away one time on a 35 degree morning watching when an older diesel farm tractor (not mine) had sat in the field over night hooked to a tandem disk left lowered in the ground. Two hired men were trying to get the tractor started. One sat on the tractor with it in gear --the clutch pushed in and the throttle at max--it would not start. The second person came and gave it a shot of ether. The engine fired--went quickly to high idle-the ether man quickly stepped back--the clutch was "popped" and away went the Allis Chalmers. SAD!!!!!
During my career working for Cat,I witnessed a lot of idiot operators running machinery. One of our challenges was how to make vehicles "idiot proof".
Beware when you ask for comments. Running off at the mouth has also become running off at the keyboard. Maybe this forum was not intended to replace the fireside chat. LOL
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