Re: All your questions about DPF & BS6 Diesel answered by a Diesel Calibration Engineer Quote:
Originally Posted by Ravi Parwan Why do we need to inject fuel to raise the temperature in the DPF? can this not be done using an electric heater? |
Active regen requires 600+degC temperature in the DPF sustained for approx. 25 mins depending on the vehicle. This amount of energy would require a very high current or voltage power supply if electrical heaters are to used.
Diesel is a very energy dense fuel, so a small amount of diesel is sufficient to reach this temperature. Its not that electric heaters cant be used, its just a matter of efficiency. Quote:
Originally Posted by delusional_fool
1. Does all the BS6 cars have active regen functionality? I own a BS6 I20 diesel and don't see anything about active regen in the manual and don't any active regen indicator in the IC. |
Congrats on the new car!! All DPFs will require active regen functionality. Quote:
2. For passive regen, how can I find if my DPF is running at 250-400degC? Is it ok to assume that if I drive my car for more than 25 Mins at speeds >20KMPH, passive regen would have happened clearing the soot?
|
Yes, driving at >20kmph speeds after the vehicle has warmed up should suffice in getting these temps. Quote:
3. Should I be consciously driving always above 2K RPM in order to avoid DPF issues? Even though the user manual is suggesting to shift gears between 1.5 to 1.8K RPM? Does this mean the 6th gear has pretty much no use even in highways since my car cruises at 100 to 105 KMPH at around 2K RPM in the 5th gear
|
2000rpm is a generic speed value I suggested, if the manual suggests you to maintain 1500 to 1800rpm for gear changes you could stick to it. Quote:
So far I've been doing mostly highway runs but starting Jan, I will be using my car primarily in the city - Roughly 18KM one way that will take ~50mins with ~40% of the distance involving frequent start-stops and I'm worried its gonna affect the DPF. Any suggestions for avoiding DPF issues in this scenario, maybe once a month highway joyride? Will that be sufficient?
|
Since you mention that your commute will have ~40% time in start-stop conditions, maybe go to rural or slightly high speeds areas once every 10 days if possible along with the highway joyride. Quote:
Originally Posted by nischaltopno Question: The calibration requires a software or/and a hardware tweak? In case of hardware changes how much is the %age of change expected for vehicles manufactured at the beginning of BS6 era - can that be easily retrofitted/changed? |
I'm not sure what you mean by hardware or software changes? maybe clarify it a bit more. Software change would just entail re-flashing the ECU with new
calibration and hardware changes are rarely done since it is expensive. Quote:
Originally Posted by Capt.Ashu 1. What special precautions would you recommend to people who drive 90% in mountains, where maintaining constant RPM is a challenge? |
As I mentioned in previous replies, avoiding overloading and driving at full throttle all the time in these conditions should be sufficient. During uphill driving the DPF should be able to clear the soot deposited. Quote:
Originally Posted by Capt.Ashu 2. Diesel has always been the primary fuel in our region as Petrol engine means low fuel economy = low range (Petrol pumps with good quality fuel are scarce) and low torque. Based on the above, how are the BS VI compliant commercial vehicles dealing with DPF issue? |
Commercial vehicles have been thoroughly tested in these conditions and dont face DPF issues as the amount of passive regen is very high in trucks above 2L capacity. Small trucks could face some issues but no major field complaints so far. Quote:
Originally Posted by Capt.Ashu 3. Does colder atmospheric temperature affect DPF clogging frequency? If yes, what special precautions required? |
During our testing, we didnt face any major problems with cold temps, so it should work just fine. Quote:
4. Because of job my car stays unused for a period of 3 months. I would like to buy XUV 7OO with AWD but it is only available in diesel, will it pose extra threat with regards to DPF ?
|
No problems to DPF if left unused for extended periods of time. Just ensure that no damages to wires or sensors happens during this due to pests or animals. |