Grant
I was not suggesting you are wrong just that the SAE main descriptions are general names for the only three possibilities to achieve all wheel drive. Even then one could argue "on demand" is really a part time system. How they are arrived at is only limited by the imagination of the engineers and how complicated and expensive the manufacturers are willing to pursue development of the weird and wonderful.
I think the 3 general descriptions (part time, full time and on-demand) cover everything possible but the sub-list of methods and designs to achieve one of those 3 results will go on expanding forever.
It is still hard to pigeon hole a design. What about a vehicle that normally runs 90% rear and 10% front - got to be full time. But if it has sensors that detect rear wheel slip and feeds power to the front axle until there is a 50/50 sharing it has got to be on demand? And if you can turn the four wheel drive off completely it has to be part time?
Lang
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