Re: REmoving Oil Cooler


"Ray O" <rokigawa@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:h3qbsu$8lf$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

BMW's charging system that only charges when the engine is on over-run or
braking. The alternator is disconnected via a beefy clutch when the
engine is powering the car. The same idea could be applied to an a/c
compressor, and when running around a town/city the mpg must clearly rise
as the a/c, like the alternator, only runs when on engine over-run or
braking. Of course an override switch for the a/c must be on the dash.
Fuel consumption must rise substantially implementing these two simple
measurers.

I saw your clarification that the charging system also charges when the
battery charge drops to a certain level. Without that, the battery would
deplete in no time.

In city driving it was viewed the kinetic energy would be enough to charge the battery. A long highway drive would entail the alternator coming in occasionally - not all the time.

Fuel consumption would not rise from implementing those two measures - it
would drop slightly.

I meant mpg would rise. BMW said about 4% from the alternator alone.

The combined parasitic draw from the water pump, alternator, power steering
pump, and compressor are probably on the order of 3 to 5 horsepower, so the
fuel savings would probably be on the order of 1 MPG, maybe 3 at the most.

If the alternator alone can get around 4% then it would be more having the others on electric. An a/c compressor alone can drop consumption by 10%.

Then put in electric power steering and fuel consumption matters are even
better again. Then using a Ni-cad battery or Lith-Ion battery will mean
greater electrical capacity for a smaller battery package.

The fan belts for the water pump and power steering can be eliminated.
Also using an electric a/c compressor will make matter better too and
again another fan belt eliminated. None of this is rocket science and can
be implemented immediately in all cars.


Gen 2 MR2's had an electric power steering pump a long time ago. Toyota
hybrid vehicles and some other vehicles with conventional drivetrains have
electronic power steering that uses a servo on the rack in place of an
electrically powered pump, and hybrid vehicles already have electrically
powered AC compressors.

Yep. Electrically power ancillaries are here but not widely used.

Implementing electrically powered water pumps, oil pumps, PS pumps,
compressors, etc. do reduce the parasitic draw on an engine, but all that
stuff is very expensive because motors and additional wiring have to be
added where a drive belt provided power before, and not all consumers would
be willing to pay an additional $1,000 for the motors. Ni-cad or lith-ion
batteries can reduce weight for a given power capacity, but they cost a lot
more than a lead-acid battery, and additional control circuitry would have
to be added so that the batteries would last longer than a month.

Electric ancillaries will make no difference to the price of a car once production is up and running.

All this stuff is not technically difficult to implement, but the additional
cost of somewhere between $1,000 and $2,000 would be a difficult sell to
consumers, especially on a lower priced vehicle and the savings in fuel cost
might not be recouped during a typical buyer's ownership period.

The other drawback to using electric motors to drive certain systems like cooling or oil circulation is that electric motors can fail suddenly with no apparent warning, leaving the motorist stranded.

Electric oil pump? Nah maybe too risky. Many ships have these to get the oil pressure up before they turn over the massive engines. They also get the oil and coolant up to temperature before turning over as well. Electric motors are very reliable. I can't see any reason why they would just fail. The bearings tend to fail before the electrical part. Bearing failure is detectable by the noise.

But improving the IC engine is not what they want to spend R&D money on. Engines are designed to reach 50,000 miles before NVH falls away, then the marketing men can sell another car. Electric ancillaries could have been implemented 20 years ago, but the auto industry does not like change - why the IC engine is a crock, where 75% of the energy in the tank is wasted. R&D money is on all electric and hybrids. BMW are fiddling with edges in start-stop, etc, because they have done little R&D on hybrids. The Germans were way behind and are trying to catch up. Look at supercapacitors, as they can claw back 99.99% of the kinetic energy and give it all back. Busses are running on them in Shanghai. A Texas company "claims" to have developed a supercapacitor with the same energy density and size as a normal lead-acid battery. That mean the chemical battery can be replaced. BTW, the Prius was originally to have a supercapacitor. A combination of supercapacitor and battery may be implemented soon. They have improved in 12 years.

.

Relevant Pages

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