New wiki and manual has launched! Check it out at http://wiki.speeduino.com
For anything you'd like to see added to Speeduino
User avatar
By PSIG
#41596
george-angelosvoudouris wrote:
Fri Mar 20, 2020 8:03 am
By the way to clarify:
24-1: is 24 teeth minus 1 (one trigger weel) (mising tooth setup)
24/1: is 24 teeth and a single tooh on cam (2 weels) (dual weel)?
24+1: is 24 teeth plus one (one trigger weel)(????)
Those are reasonably correct. If it helps to expand concept; 24/1 is 24 teeth (trigger signals) per 360° crank revolution from any suitable source, and 1 cycle reference signal from any suitable source every 720° (two crank revolutions) on a 4-stroke engine. While the source of the cycle signal is typically the half-speed camshaft or cam drive mechanism, the signal does not have to source from there, and is more properly a cycle signal. Sometimes terms such as "cam signal" are convenient, but can also limit scope and understanding.

Keep in-mind, "teeth" can be any sensor target or change feature to be sensed. Added material (teeth), bumps, missing teeth, gaps, holes, slots, etc. The tip of a valve or rocker, or pressure pulse from a mechanical fuel pump could be sensed as a cycle signal. Below is a "GM 7x" wheel (6+1), which has gaps instead of "teeth" to the same effect. As you can imagine, the sensor response and the input circuit (conditioners) response or actions become rather important for setup in order to read the correct feature of the wheel at the correct time.
george-angelosvoudouris wrote:
Fri Mar 20, 2020 8:03 am
Also at the injector deadtimes is it possible to specify at wich voltage is the 0.8-1 μs? For example 0.8μs @ 12.5 volts so that we can have the presentage change to all the other voltages.
Whatever value is entered as 100% is your baseline, and applies the dead time (latency) value entered. If your correct injector latency is 0.8ms at 12.5V, then enter the 100% value at 12.5V and your baseline dead-time as 0.8ms. Other percentage values you enter are applied at other entered table voltages and interpolated in-between. Search for posts and info of how the corrections work and how other ms%@V values are calculated from that baseline value.

David

GM_7x_pattern.jpg
GM_7x_pattern.jpg (58.19 KiB) Viewed 393 times
#41599
Those are reasonably correct. If it helps to expand concept; 24/1 is 24 teeth (trigger signals) per 360° crank revolution from any suitable source, and 1 cycle reference signal from any suitable source every 720° (two crank revolutions) on a 4-stroke engine. While the source of the cycle signal is typically the half-speed camshaft or cam drive mechanism, the signal does not have to source from there, and is more properly a cycle signal. Sometimes terms such as "cam signal" are convenient, but can also limit scope and understanding.

Keep in-mind, "teeth" can be any sensor target or change feature to be sensed. Added material (teeth), bumps, missing teeth, gaps, holes, slots, etc. The tip of a valve or rocker, or pressure pulse from a mechanical fuel pump could be sensed as a cycle signal. Below is a "GM 7x" wheel (6+1), which has gaps instead of "teeth" to the same effect. As you can imagine, the sensor response and the input circuit (conditioners) response or actions become rather important for setup in order to read the correct feature of the wheel at the correct time.
Thanks David for widening my point of view I hadn't thought like this. Now things are a bit more clearer in my mind.
Whatever value is entered as 100% is your baseline, and applies the dead time (latency) value entered. If your correct injector latency is 0.8ms at 12.5V, then enter the 100% value at 12.5V and your baseline dead-time as 0.8ms. Other percentage values you enter are applied at other entered table voltages and interpolated in-between. Search for posts and info of how the corrections work and how other ms%@V values are calculated from that baseline value.
After some thinking I derived to the same conclusion today. When things are already done for you your mind stops working. :shock:

Sorry for the off topic
  • 1
  • 6
  • 7
  • 8
  • 9
  • 10

Dazq. Thank you for a quick reply. You are the […]

i've read again the wiki, and not sure which ha[…]

Printing in PETG. PLA wouldn't stand a chance in[…]

Thanks for the positive feedback. I'll stick with […]

Still can't find what you're looking for?