Re: OBD (On-board diagnostics) for Indian Cars Quote:
Originally Posted by a4anurag I tried to see what values my Swift ZDi gives for Engine Load parameter.
Here are the screen shots :
At 100 kmph (Without A/C): Attachment 1416582
At 100 kmph (With A/C): Attachment 1416583
So what load values your getting isn't right IMO. 30% is high. I am getting 16 to 18% at idle. Hope all electricals are OFF. |
Comparing the load at a speed can be tricky because it fluctuates heavily based on the following. - Whether the vehicle is climbing or descending ( even slight slopes can create huge variations in engine load. We might not even realize that we are on a slope because of the comparative slope of the terrain that we are on )
- Whether the vehicle is accelerating, decelerating or steadily maintaining speed with constant accelerator input.
If comparison needs to be done, it should be done on the same road on 2 vehicles using the same driver trying to maintain a constant speed on the same gear with fixed throttle input. Quote:
Originally Posted by Jeroen All these idle loading numbers are off the wall. When an engine idles there is virtually no load. Idling cold or warm has less then marginal effect on the idle loading which is very low anyway. |
Engine load is zero when descending with engine braking. ( like coming down a slope on 3rd gear without accelerator input ). To keep the engine on idle, there is indeed a load. Quote:
Originally Posted by Jeroen Your typical AC would draw 3-5 horsepower max and that includes both the compressor and fan. So 10% is way off as well. Would be interested to understand how this kit calculates loading, because it cant measure it. It can only calculate it based on its input parameters.
Jeroen |
If we assume that the torque at 800 rpms is 80 Nm, the power at that rpm is 9 HP.
15% of 9 HP is just 1.35 HP. So, it doesn't seem to be way off target at all. Quote:
Originally Posted by pixantz I'm finding it hard to understand why are we wondering about parameters and other jargon when a trained technician or mechanical engineer is the apt guy supposed to be worried about this stuff. I mean, it's not like discussing congress bjp politics, no? These are highly technical details/ readings and I don't feel that just about anybody is supposed to understand them clearly. Believe me, those mechanical engineering journals are really thick and heavy. Just saying.... |
Not necessarily. If you know what happens inside the engine, it's easier for you to take any issues to a closure in a faster way. for instance, initial batch of Etios diesel had a software bug where the threshold for normal air intake was set very low, and the vehicle would fall into safe mode where there is a huge loss of power. The service engineer didn't have a clue of it. It's because I kept on insisting that the Fuel:Air ratio is not correct is when they found out the root cause and fixed it with a firmware update ( with the help of Toyota ). I'm not a mechanical engineer. I'm an electronics and communication engineer. And if there is any knowledge that I have today on mechanical engineering, it's through these discussions that I read and be a part of in team-bhp. Quote:
Originally Posted by audioholic Firstly, disregard calculated load value, since the calculations done are very random. So random that this parameter in my WagonR is dependent upon throttle position and commanded idle. So I can switch off the engine, floor the accelerator and yet the calculated load will remain showing some value.
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It's not the same for me. Maybe because it's showing absolute load. Not sure.
Last edited by amalji : 19th September 2015 at 09:47.
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