Limitation 70 km / h on the device

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I Citro
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by I Citro » 26/01/14, 18:59

One thing is certain, from a conceptual point of view, the best transmission for a combustion engine is the transmission of Toyota Hybrids ...

It is the only one that allows the engine to always be at the best speed whatever the driving situation (acceleration, maintains speed, deceleration, stopping the vehicle).

Finally and whatever some say, Toyota Hybrid Transmission, just like electric vehicles can run at low speeds with consumption even lower ...

Stop inventing "fixed losses" that would cause engines to consume more while driving slower, it's ABSURD.
If some vehicles consume more at low speed, it is that they are poorly designed, mainly in terms of their transmission ... and that their drivers do not know lead them ...

So, to take one last remark, the ideal would be that the speed limits vary according to the density of the traffic, 15 or 20 kmh at peak hours at 70 or 80 kmh at off-peak hours with strong radar to force the users not to exceed these limits not to FABRICATE traffic jams by their brakes and allow a safer traffic (less accidents), more fluid and more relaxed. It would also be good to verbalize the exciters who believe they are gaining time constantly change lanes and only add accidents and congestion to traffic without gaining anything on their journey time but consuming and polluting considerably more ...
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by Forhorse » 27/01/14, 01:42

agree to 100%

The so-called "hybrid" transmission really allows the thermal engine to be used at its ideal potential (better efficiency, therefore optimum power / consumption ratio)
I do not understand that it does not generalize anymore.
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by Macro » 27/01/14, 10:52

Let everyone ride in sax or 106 electric : Mrgreen: : Mrgreen: more pollution (at least locally) and more speeding (except in descents) ...
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danielj
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by danielj » 28/01/14, 17:26

Totally agree with you PITMIX


PITMIX wrote:Hello
I practice the device every day, I can say that this limitation to 70 is bullshit in my opinion. Pollution and noise will not change. Accidents will be less severe provided that scooter drivers also respect the speed limit.
The days they can limit it to 30km / h if they want! The average speed is 12km / h, the night everyone rolls in 4ème to be able to restart the car as soon as it is necessary.
The respect of the distances is even worse than before and at the approach of a radar people fall to 50-60km / h. The only thing that will work with the speed limit is the drop in attendance by the avoidance of periph at night for those who want to go from one end to the other of the Ile de France.
There will also be more money for the state that will flasher more heavyweights.
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danielj
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by danielj » 28/01/14, 18:25

citro wrote:
Stop inventing "fixed losses" that would cause engines to consume more while driving slower, it's ABSURD.
If some vehicles consume more at low speed, it is that they are poorly designed, mainly in terms of their transmission ... and that their drivers do not know lead them ...

.


Oh no, there are many constant losses in a heat engine, only because the engine must operate at a minimum temperature as I have specified here:
(MessagePosted on: Sam 25 Jan 2014, 17: 06
But, let's not forget that, all things being equal, a thermal vehicle (or even electric but to a lesser extent) will consume more than one hundred kilometers below a certain speed!
This is not only due to the maximum torque at a certain speed of rotation of the engine, but also because of the constant losses of the motors.
Especially for the thermal engines their operation at a high temperature (cooling water at 90 ° C). Even when the car is driving very slowly and the power supplied to the wheels is very low, it is necessary to heat the engine!

When you drive very slowly, the journey time increases a lot, and the expense to maintain the engine is relatively high!
Below a certain speed, we consume more! )

This is really not an invention. Besides, certain car magazines had already measured it; I have to ask AUTOPLUS.
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by I Citro » 29/01/14, 00:12

I had read your remark, but I do not agree with you ...
It's not a constant loss, it's a proportional loss ...

It is easy to minimize it by insulating the motor in order to reduce this loss to a minimum and to maximize the efficiency of the heat exchange, for example by precisely managing the cooling.

Currently, the cooling of the motors is governed by the flow rate of the water pump which is driven by the engine speed, as it is driven by belt, which is not rational ...
The management will be much better when the water pumps will be electric and variable flow. This is announced for years by the equipment manufacturers and is just starting to appear in series on high-end models ...

The lower the speed, the less energy is needed to reach and maintain it.
Consumption really increases if the gasoline consumed is not used to advance the vehicle ... This is what makes hybrid machines interesting ... They cut the engine in these phases to further reduce consumption.
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by Forhorse » 29/01/14, 09:11

citro wrote:Currently, engine cooling is governed by the flow rate of the water pump which is driven by the engine speed,


And the calorstat it serves for what?
Rolls in a car whose engine does not, you will see if it is the flow of the water pump that manages the cooling.
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by I Citro » 29/01/14, 09:20

The calorstat, now double-acting, prevents any flow to the radiator as long as the engine is cold, then regulates the flow when it is hot.
The problem comes from wasting energy because the heat pump opens or closes without knowing the actual flow rate of the pump, only on setpoint temperatures.
It works, but it's not optimized ...
It is, among other things, for this reason that we put several fans on the radiator, and they have several trigger temperatures, instead of being controlled proportionally, which would further reduce consumption.

The management of all the thermal flows of a vehicle is still extremely rudimentary ... Despite an important consideration during the design (mainly aerodynamic).
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by Macro » 29/01/14, 09:37

Bofff for the electric pump ... Of one it will consume electricity provided by an alternator with minable output. Two it will weigh very heavy (when a motor turns full wad it needs flow to cool it) of three it will increase the number of breakdowns ...

When the thermostat is closed and the pump (centifuge) runs at a reduced flow it represents a ridiculous load on the engine ...

Those who have owned BMW525 with electric circulation pumps for heating know well the reliability of this kind of accessories ... : Cry:
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by Forhorse » 29/01/14, 10:02

+1

If the electric pump is not necessary, it is probably that the final gain is low or nonexistent.
Between the efficiency of the alternator and that of the electric motor of the pump, in the end it should not be less of a loss than a pump driven directly by the engine.
The power absorbed by a centrifugal pump is proportional to its flow. Cool engine, closed calorstat, the load must be negligible. And then it's proportional to what the calorstat will pass.
Basically the pump consumption regulates itself, naturally, depending on the engine temperature.
Wanting to do the same with an electric motor and electronic devices will only bring a useless complication of the trick.
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