Smart Turn System

[GoldOxide_imp]

The Smart Turn System offering seems appealing, and by 21st century (2019) availability, should not be profound. The old early '80's Yamaha self-cancelling offering was good, but I would say maybe about 90%+ reliable. Therefore, the rider is still checking the cancel anyway. But that was almost 40 years ago and it was likely very primitive, electro-mechanical in nature and limited to one or two degrees of sensitivity. I speculate the ST2 offering is a full-embedded solution with multiple degrees of sensitivity and sensor signal analysis to get closer to 100% reliability. I suppose ultimately, would a rider get to the level of comfort to not confirm the signal cancel? I reckon for many, that habit is burned into our riding check ritual.

[Obleo]

Yes we have been down this path before. I have a 2004 Road King Custom that has self canceling turn signals,always work never a problem. May need to say that Honda could catch up to old tractor technologies. May be should start another thread to up my post count . Hello and welcome to the forum.

[17-CB-002]

Hi GO,
Can you please describe/explain how the Yamaha "Self Cancelling" works?

[GoldOxide_imp]

Hi GO,
Can you please describe/explain how the Yamaha "Self Cancelling" works?

Hey Alain:

I didn't tear one down. I just used them as a rider.

Given the era in which they worked, I suspected they were quite primitive. I don't mean mercury switch primitive, but possibly a voltage source detection primitive. There might be some online information.

I recall when the rider asserts a turn signal, the engine rev speed was either high (moving and possibly decelerating) or stopped and lower engine rev. In the first case the system voltage is high - maybe 13.5V. When stopped idling at a light the system voltage might be 12.4V. When the rider accelerates again, the engine speed increases and the system voltage transitions back up to 13.5V. Maybe a "capacitor-based timer" begins following the transition of low-to-higher voltage and when it completes, it kills the signal relay using a switching transistor.

Assuming this was somewhat the approach (and I really don't know), the problem was when the rider signaled during a constant velocity turn keeping a decent engine speed. In this case, the signals would often not cancel automatically (which I experienced) because the elevated system voltage was maintained. In addition, I also recall sitting stopped at turns with signals flashing and revving the throttle a few joyful times. That would also sometimes cancel the signals.

I don't recall auto signal cancelling during lane changes at speed working well either.

Of course today, this can all be nicely done in a lightweight digital embedded system and likely a reasonably organized state machine design around some reliable sensors.

[Ernie_imp]

Yes . I have the neutron activated protein powered signal turn off installed at birth.

[GoldOxide_imp]

Yes . I have the neutron activated protein powered signal turn off installed at birth.

lol - Welcome back to the Forum Ernie!

[Rocky_imp]

Yes . I have the neutron activated protein powered signal turn off installed at birth.

I must check to see if I have one of those

[Obleo]

Yes, indeed welcome to our humble forum .

[GoldOxide_imp]

http://cb1100forum.com/forum/showthread....#pid256277

[GoldOxide_imp]

the self cancelling signals on yamahas worked off a sensor in the speedometer actually. there was a pickup that senses over a certain speed it would then trigger a relay and 'kick' the switch off in the control. My rz had one as did some RD400s and XS650s that ive seen. just fyi.

Yes, I would say over the decades Yamaha probably had the most reliable implementation of all the brands. It wasn't 100%, but I would say at least 90% reliable on a healthy, well-looked after bike.

I think Honda's implementation is significantly more technical in nature. Who knows? Maybe it is over-engineered like a German electrical brake light system? I suppose 2020 AT owners will determine in time.