Re: Electric Creep/Crawl Mode Quote:
Originally Posted by dark.knight I'm not familiar with electronics at all, although I fully understood what you meant to communicate. It might help but it comes with the following hiccups (speaking mechanically of course), pardon me if I've not completely thought through the scenario from all directions.
1) Not all traffic in India is the same, traffic management is becoming more efficient so when a signal is released nowadays the traffic flows atleast at 20-30+kmph before coming to a halt. Yes in certain crawling speeds-consistent traffic like before toll-booths or in certain Mumbai gridlocks it will be useful |
Like everything else in life, this isn't an answer to all the problems. This is the basic structure for a solution to a major problem. This can be stretched to handle more situations. Quote:
2) While the solar technology itself might come relatively cheap as you say, the company will surely charge much more owing to installation, sourcing costs and of course premium for the convenience. Big price to pay for the small convenience occasionally. Our public are very cost-conscious. Lithium-ion batteries maybe cheaper than before but its going to put quite a hole in the wallet given the capacity needed to power 2 wheels, not to mention replacement costs every 4-5 years. This is because the cost of say a 2000mAH phone battery today costs about Rs.2000+. A car backup battery would cost much more and also add to weight.
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What you are saying is not entirely true. All companies are trying to throw in an additional feature no else has in every segment to be more successful or cars now and cars ten years ago would have been the same. Li-ion battery cost is now estimated at 200-300 USD per kWh and is coming down. Don't compare it to the minuscule mobile battery price. After market mobile battery business has a different model to itself and may not reflect the actual battery price exactly. If engineered properly, a 10 km crawl shouldn't be a problem for a 1 kWh battery. Li-ion batteries last much more than 4-5 years if managed properly (read thermal management). I want to sight an example here, but for the fear of derailing the discussion refraining from doing so. And yes, occasionally? Not, if you are a city commuter. Quote:
3) If its separate Lithium-ion battery driven wouldn't the alternator be strained a little more than usual since its powering 2 batteries? Assuming the feature isn't used at all wouldn't fuel consumption increase?
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We are talking a trade-off here. Yes, you would need energy to move a vehicle from Point A to Point B notwithstanding the type of power train used. A lot of energy is wasted by people over accelerating (and hence over braking) in the crawling traffic. What I'm saying is that worst of worst, the energy used by the whole electric power train will be less then the power wasted in such a manner. Quote:
4) Some people take the foot off the brake pedal during traffic halts, me included. In this scenario a separate kill-switch has to be provided that would not activate the motor. That & a kill-signal has to programmed when activating hand-brake during the time people have to get out for a minute (shopping/opening gates etc) and do not wish to turn off the engine. That's a lot to think about when such technology is installed, could lead to minor errors.
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True, but this is how all automatics have ever worked. So, it's like using an automatic. You get used to it. And, you shouldn't take the foot of the brake pedal unless you have engaged the hand brake. Quote:
5) Alternatively the crawl mode can be activated when the car is in neutral and one simply taps the accelerator. The constraint here is purely cost related.. more CAN bus programming, more complexities and more wiring. Of course here too one has to be careful not to go anywhere near the accelerator pedal if the intention is not to move. |
Yes. There'll be a lot of switches and sensors and some logical programming. Quote:
6) Assuming one wants to immediately accelerate from the crawl mode then a kill-switch for the RWD has to programmed into the clutch as well and not just the brakes. Otherwise one has to literally stop before going into manual mode. Without that, conflicting signals will go to both the front & rear wheels and rear wheels might lock since their speed is low and they cant keep up with front ones.
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All these will be taken care of the algorithms. No biggie. Quote:
Edit : 7) In the Indian scenario where two-wheelers, rickshaws etc cut left and right ahead of us during signals making us brake abruptly, a constant 3kmph acceleration upto 15 kmph may put one slower than the rest of the vehicles. If the vehicle is faster than the other vehicles then its going to lead to minor incidents. |
3 kmph/s is a random number I threw our there. That might need optimization. But still there aren't that many autos that can beat that! Quote:
8) Radar detectors for proximity control for front & rear, ensure more programming, wires & of course much more cost. If we add all the safety overrides for this technology the cost might be equal to or more than the price of a CVT/dual clutch auto box.
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I'm not talking about replacing autoboxes here. I'm talking about a solutions to two different problems in one, cost effective and a sustainable way. At least that's my intent. Sensors aren't that costly, programming isn't that big a deal. An electric motor shouldn't be that big of a problem either. It get's a little tough with the batteries and the power electronics. But that's the fun part. Quote:
Originally Posted by Sutripta Could you shed some more light on the engineering changes required and its associated costs.
Regards
Sutripta |
Costs, I don't have exact numbers. Engineering changes, I thought I gave a decent outline already. Making room for all the stuff that is discussed might turn out to be a bit of a challenge thought. |