Re: Tata Motors secures patent for Auto start-stop tech! Quote:
Originally Posted by ashis89 1. Does it put additional pressure on the starter and the battery? I'm guessing the battery and the starter have specific starting cycles as their finite life. This feature would unnecessarily increase the number of crank cycles. If what I say is true, then what is the net gain from this feature? (Fuel savings - Cost of feature - Cost of premature battery replacement - Cost of starter repair)
2. ... turbo-idling in turbocharged vehicles. Even the manufacturers themselves advocate the practice. Doesn't this feature bypass this practice? | Quote:
Originally Posted by mpksuhas they would switch it ON insisting that it will return more mileage.
Yes, logically it would. However, lets hope the manufacturer have factored this too when they calculated the life cycle of the same.
Chances of someone driving in high RPM and suddenly coming to stop is relatively rare. It is possible though. | Quote:
Originally Posted by sagarpadaki Sometimes I feel manufacturers build on features for the sake of it rather than evaluating how pragmatic the feature is in the real life conditions. This is one such feature. | Quote:
Originally Posted by ashis89 We can be sure that the manufacturers have not factored in the additional load on the battery since the OE battery is similar to the ones available in the market for other vehicles.
I hope the design team is cohesive and plan these features together keeping in mind the tolerances and life cycle of all the parts of the vehicle and not with some singular aim (as in increasing the FE). |
1. I had chance to interact with some starter motor and battery suppliers for some different reasons some 8 years back. During casual discussion, the topic of start stop system and its impact on Starter and battery came up. The common observation was their understanding for need of higher crank cycle life for both to be used in vehicles with Start-Stop feature. They had products to cater the enhanced requirements. It was upto the OEMs to define their requirements and cost targets to arrive at a suitable selection. So, I hope in last 7-8 years technology and capabilities would have improved further.
2. One may or may not find significant 'visible' differences in the starter motor and battery for the two types of systems (with / without Start Stop). So, I can't judge on the parts quality/ endurance limits just by looking at them.
3. On a personal note, I have always questioned the real world efficacy of the start-stop systems (or even the micro-hybrid systems); particularly in the bumper to bumper traffic conditions like in our country.
4. More than that, I question the method of FE measurement and declaration adopted by ARAI itself. Soaking of vehicle at 25±5 deg C before test is non-coherent with Indian conditions. It should be changed to higher value (e.g. 35±5 deg C) to represent real operating conditions for major part of country for most of the year. The current test method was more of a copy-paste job from EU. And I am sure that the automotive lobby will strongly oppose any move to change this basic parameter as that will pull down the 'declared' FE figures significantly.
5. For effect of Start-stop function on turbo-charger, I agree with opinion of mpksuhas.
Last edited by AutoNoob : 3rd May 2016 at 12:19.
Reason: added tolerance on temperature value
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