Quote:
Originally Posted by SPL
FastMover — For a road speed of 50 miles per hour, and for the ICE rpm's that you cite at this road speed, I compute quite different values for MG1's rpm using my formulas (from the thread " Heretical Mode" post #40): - ICE = 1450 rpm => MG1 = -684 rpm (Heretical mode)
- ICE = 1550 rpm => MG1 = -324 rpm (Heretical mode)
- ICE = 1650 rpm => MG1 = +36 rpm (Normal mode)
We really must try to resolve this discrepancy, which has cropped up before. If I am wrong, I'd like to correct my formulas; and if you're wrong I'm sure that you'd like to do likewise. I've clearly explained the derivation of my formulas in the thread cited above. They are deduced from Toyota's published gear ratios for the TCH. In the interests of accuracy and transparency, please tell us your formulas and their derivation!
Stan
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OK Stan, just for you.
Attached is my little spreadsheet toy. At 50 miles per hour, 1450 RPM, it gives -1202, and at 1650, it gives -482.43. It is based on published gear ratios and data in all cases, and cross-checked against the P311 Service Manual data (the "Sanity Checks") . The highlighted areas are inputs, and you can play with it to discover some things. For example, at 121 miles per hour, MG2 is turning faster than 10K, and closer to 15K. To keep MG1 under 10K you need to have at least 1550 ICE turn, irrespective of any torque loads. (It will always be much higher at that speed, as we all know.) Interestingly, if you take the ICE to the redline at 6250, mg1 will also be in tolerance, but turning positive.
Either way, we should know sometime this month, I have the frequency sensors working now on MG2 and MG1 power leads, and should be able to read them directly on the triple tach. I have also attached the RPM/Frequency curves for the triple tach as some asked if I could get the resolution.
RFB