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I tell my project team I am on the job to give everyone else someone to blame.
In every significant project, there comes a time when you need to shoot the engineer and finish the work.I tell my project team I am on the job to give everyone else someone to blame.
Yeah I've tried to sort out how inertia would play into this. For the momentary period when the driver's foot is off the "gas" we are drawing minimally from the battery so wheel-generated power added back to the battery might be a net positive.I suppose it depends on how we describe the cases for comparison. Capturing energy from inertia during each stop-start cycle would certainly be better than not capturing energy from inertia during each stop-start cycle, so for stop-start city driving I can see how one would argue the range is extended. But I would expect steady-speed highway driving to have a longer range than either of these stop-start cases, and that range to be impeded by continual recharging from wheel-generated incremental power.
What you describe is why the brakes last longer on most vehicles that travel large distances on highways (like out here in the Dakotas) and you might not use your brakes at all for fifty miles (not much traffic, either). In town, though, braking is almost as frequent as acceleration, what with traffic, stoplights, and such, so it might make a difference there if the braking included using the momentum of the vehicle to generate electricity.
Electric regenerative braking, ie a generator tied to the wheel, is taking momentum, ie kinetic energy, and converting it into electric energy.
But it takes energy, it slows the vehicle down. You have to add more energy into the motor to keep at the same speed, like driving with the brakes on.
It is the electric motor, functioning as a generator, not a separate generator.It is only utilized for braking, not while keeping a steady speed. It is taking otherwise wasted kinetic energy, slowing the vehicle in the process, and using it to recharge the battery.
Yes sir, I agree completely. I was referring the previous conversation of trailer mounted and how this demonstrated the principle.
What confused me then is only halfway thru your comment did you mention "trailer". So I took that as a separate example.
I probably wouldn't be an engineer if I could communicate effectively. Absolutely adore using drawings to communicate. I frequently leave out words that would have help describe...I really try to reread and understand what I left out, but the voices in my head just fill in the blanks automatically...
I always do what the voices in my head tell me to.
How do you hide that many bodies?
Castles have catacombs.
Rednecks have backhoes.
@thackney I joined the discussion to suggest a doable plan for people with electric cars to drive long distances. I had no idea it was going to dissolve into a discussion about how many kilowatts could dance on the head of a pin,and how many that WERE dancing were break dancing,and how many were square dancing.
@thackney I joined the discussion to suggest a doable plan for people with electric cars to drive long distances. I had no idea it was going to dissolve into a discussion about how many kilowatts could dance on the heaThe idea in MY alleged mind was to develop a practical plan to GET THERE and GET BACK,and all I got was "it ain't gonna work because it ain't cutting edge."
What type of square dancing? Traditional, contemporary Western, Irish, or Scottish?An engineer's job should never involve the phrase 'it ain't gonna work'. An engineer's job is to find a way to make it work.
An engineer's job should never involve the phrase 'it ain't gonna work'. An engineer's job is to find a way to make it work.
@Hoodat I'm not an engineer. I'm a dood wid a GED.
@Hoodat I'm not an engineer. I'm a dood wid a GED. I define "it works" when I get something to do what I need it to do,and to hell with everything else.
In the Bayou there be Gators.
In the Everglades there are boas, pythons, anacondas and gators.
I too only have a GED and did not go to college at all. I was hired as a engineering tech at a large Sunnyvale microwave (and RF and digital) communications equipment manufacturer in the early 80's. I was promoted to junior design engineer and then senior design engineer after about 2 or 3 years. Can't really remember when anymore... I had a hard time getting through the door on the initial hiring as an engineering tech due to the HR department. But once I was finally hired I had no problems moving forward. After about 5 years of that I did consulting for several years and then started my own satellite communications company designing and selling satellite modems (and other related equipment) all over the world. I also hold patents on communications tech.
Let the donkeys pack 'em off--- @roamer_1 , rednecks have pigpens too...
But...It is also the engineer's job to determine if there's a violation of the laws of physics and to cut it off before too many resources are wasted on it. Something can look great until those pesky little nitty gritty details start emerging showing otherwise. It is real easy to ignore some "little" detail that no one has an answer for and keep going with the project with plans to address it later only to find out it can't be solved later with what was already done... Those are the things that should be done first. You have to resolve the unknowns first or at least know that they are solvable with certainty on the path you are taking.
Damn that's a lot boots.
In the nuke world, we have an acronym for that - LOPA - Loss of Physics Accident......
