throttle by wire

[jimmy z]

I am new to this forum + a new tenere owner.Could someone explain to me how this bike is a throttle by wire when there are two throttle cables?Looks like a conventional throttle setup.

 

[dave6]

Both cables go to an electronic device on or about the shaft that the butterflys for the two injectors are mounted. The accelerator cable opens the device and the and the decelerator cable closes the device. If the injector fails to close electronically the decelerator cable will over ride the electronics and mechanically close the butterflys. Having the cables to the injectors adds a factor of safety. I think if the throttle servo ever failed I am willing to bet you could wire the safety stop together and run the throttle manually to get you home. This is something I had a close look at before I bought the bike.

 

[jimmy z]

Dave6, Thank You for the reply, Jim

 

[NoMorBills]

http://www.yamaha-motor.com/sport/products/modelfeatures/651/0/features.aspx

Look here..

 

[Tremor38]

Both cables go to an electronic device on or about the shaft that the butterflys for the two injectors are mounted. The accelerator cable opens the device and the and the decelerator cable closes the device. If the injector fails to close electronically the decelerator cable will over ride the electronics and mechanically close the butterflys. Having the cables to the injectors adds a factor of safety. I think if the throttle servo ever failed I am willing to bet you could wire the safety stop together and run the throttle manually to get you home. This is something I had a close look at before I bought the bike.

Ummmm, well kind/sorta. The cables control the position of an 'Accelerator Position Sensor' which tells the ECU how much throttle us hamfists have dialed-in. Based upon this 'I want' signal from the accelerator position sensor, the ECU drives a motor that is mounted to the throttle bodies (Throttle Servo Motor) to driive the TB's open or closed. A 'Throttle Position Sensor' (TPS) sends a signal to the ECU, telling it when the throttle bodies have reached the desired position, so the ECU can stop driving the motor. That's the very, very simplified explanation.

The throttle by wire or 'YCCT.' Has absolutely no direct role in closing or opening an 'injector,' nor overriding one that has 'failed to close' but I am assuming that you maybe meant 'throttle body.' Regarless, you would have to override the sevo motor somehow to manually postion the throttle bodys. I think Yamaha just didn't want a variable resistor on the handle bars. That and they can more easiily fit the items needed to control the sensor's rate of movement in a void above the engine.

 

[dave6]

Ummmm, well kind/sorta. The cables control the position of an 'Accelerator Position Sensor' which tells the ECU how much throttle us hamfists have dialed-in. Based upon this 'I want' signal from the accelerator position sensor, the ECU drives a motor that is mounted to the throttle bodies (Throttle Servo Motor) to driive the TB's open or closed. A 'Throttle Position Sensor' (TPS) sends a signal to the ECU, telling it when the throttle bodies have reached the desired position, so the ECU can stop driving the motor. That's the very, very simplified explanation.

The throttle by wire or 'YCCT.' Has absolutely no direct role in closing or opening an 'injector,' nor overriding one that has 'failed to close' but I am assuming that you maybe meant 'throttle body.' Regarless, you would have to override the sevo motor somehow to manually postion the throttle bodys. I think Yamaha just didn't want a variable resistor on the handle bars. That and they can more easiily fit the items needed to control the sensor's rate of movement in a void above the engine.

Yes butterfly valves in the throttle bodies is what I meant, not the actual fuel injectors of course.....If you look at the throttle bodies you will see the cable will over ride the motor when reducing the throttle position if the motor doesn't do it. Your explanation is much better than mine.