ignition Kill for quickshift

[ashdricky]

I may have read this in correctly but it seams as though this component has 8milli ohms and is not mechanical

http://pewa.panasonic.com/assets/pcsd/catalog/aqz-sil-1-form-a-dc-high-capacity-catalog.pdf

[posplayr]

I may have read this in correctly but it seams as though this component has 8milli ohms and is not mechanical

http://pewa.panasonic.com/assets/pcs...ty-catalog.pdf

Yes but it also says it is not for automotive use (yes I know you are taking about a motorcycle, but the warning is still relevant)

It is solid state, but there is a funny condition on the 8 msec as it is measured at 1 sec delay.


This devices switches relatively slowly. Off time can be 3 msec

It also states that the maximum switching rates is 0.5 cps (cycles per sec)


Have you ever looked at the sparkline waveform on a scope, the open ground end (Coil -) can really jump around and 60 V is not enough. (typical ratings are 360V for coil drivers)

As a general rule the plus side is always tied to the battery so it is not as dynamic, you start breaking that repeatedly, it is know as "inductive loading" the coil is a big fat inductor. Read the app note at the bottom for that.

[ashdricky]

Yes but it also says it is not for automotive use (yes I know you are taking about a motorcycle, but the warning is still relevant)

It is solid state, but there is a funny condition on the 8 msec as it is measured at 1 sec delay.


This devices switches relatively slowly. Off time can be 3 msec

It also states that the maximum switching rates is 0.5 cps (cycles per sec)


Have you ever looked at the sparkline waveform on a scope, the open ground end (Coil -) can really jump around and 60 V is not enough. (typical ratings are 360V for coil drivers)

As a general rule the plus side is always tied to the battery so it is not as dynamic, you start breaking that repeatedly, it is know as "inductive loading" the coil is a big fat inductor. Read the app note at the bottom for that.

Thank you Posplayr, I really do appreciate you taking the time to help me look into these things, I am a relative amateur in the electronics field. I am not really sure what a sparkline waveform is (my best guess is the wave that one would view on an oscilloscope), I do see the note regarding Inductive load so I guess this relay is out, someone on an electronics forum suggested using a heavy duty MOSFET in place of a relay, Do you think this would fly? The trouble is that I currently don't know enough to make a selection, I only now know of inductive load thanks to you.

[posplayr]

Thank you Posplayr, I really do appreciate you taking the time to help me look into these things, I am a relative amateur in the electronics field. I am not really sure what a sparkline waveform is (my best guess is the wave that one would view on an oscilloscope), I do see the note regarding Inductive load so I guess this relay is out, someone on an electronics forum suggested using a heavy duty MOSFET in place of a relay, Do you think this would fly? The trouble is that I currently don't know enough to make a selection, I only now know of inductive load thanks to you.

I told you before to either depower the ignitior by removing power to it or the ground to it and you will not have to deal with either an inductive load or high currents. You will have to make sure the ignitor does what you want during the cut out but, of course if it has a computer in it it probably will not like that. I guess you said you were using a Dyna 2000 so that is probably out.

The easiest thing is to use the Dyna 2000 immobilize for exactly the issues that you are discovering.

The next best thing is to block the ignition pickup. I did some testing on that and an opto isolated Solid state relay is a good choice. You will still have to make sure you can deal with the voltage. I have never measured a dyna 2000 pickup but on the stock GS1100E ignitor pickup you can seen almost 100-200 volts but very little current. The current was virtually nill, less than what I could measure with a current clamp and scope on a 50 mill-amp per division scale. So figure less than 5-10 mAmps.

[ashdricky]

are you describing something like this?

only w replace horn button with our relay/mosfet/optoisolator?

[posplayr]

are you describing something like this?

only w replace horn button with our relay/mosfet/optoisolator?

Quote, no I have never seen that before although I have seen horn buttons used to kill the ignition, just not sure how it was done.

You can see that those diodes are speced at 6 amps and 1000V!!!. There is a reason for that. The switch probably arcs over as well unless it is rated at 250V plus.

If you have not figured it out yet, that ignitor has a very high tolerance for high voltage and current [especially at it's coil(-) connection]. It is not trivial to duplicate with an outside solid state device without essentially duplicating what is in side.

If you try and open either side of the coil it is going to apply.


You can look up this kind of stuff all under the heading "COIL DRIVER":

NGB8202N
NGD18N40CLB


You can also look for a write up titled "CAR IGNITION WITH IGBTS" for an overview of what goes on.

You can also go to the MegaSquirt website and look up options for coil drives because that is what you will need to use if you try and implement that diode switch arrangement using a computer or other timing device.