Hi, I am having an issue with my RPM signal. It is dropping to zero rpm every cycle. i have 36-1 tooth wheel. I have selected 36-1 in triggers but it seems to count the missing tooth as 0rpm???
Seems to read all 35 teeth as expected.
Not sure what is happening here?
Anyone? I dont understand why the primary trigger is effected by the secondary trigger? The primary trigger should function independently of what the secondary trigger is doing should it not?. I can get a stable rpm if i change the secondary trigger type to “scope” but i dont really know how scope setting works. seems to be linked to the unexpected missing tooth error as below. How do i fix this error? its a 36 tooth wheel with one missing tooth.
what hall sensor do you use, how wired it - how powered? may be it is need +12v power instead of +5.
what car? it is realy 36-1 or may be just “look like” and it is toyota 36-2 ?
Car is a jaguar xj6 series 3. It’s a 36-1 wheel I fitted myself. The crank sensor is a honeywell SNG-Q hall sensor that gives a positive square wave output. The cam sensor is a zf, cherry Hall sensor that falls to ground. Sensors are rated for 5v. wiring seems correct. The unexpected missing tooth error seems to align with when the cam signal changes. Seems to interfere with the crank signal.
Okay, let’s think about it. ZF is an NPN output. That is, it produces a high level when there’s no magnetic field and a low level when there is.
OK: you need a pull-up resistor for the NPN sensor output. and Falling edge
primary trigger - the hall sensor is an SNG-Q, which produces a positive square wave. So, it’s a PNP sensor, so you need a pull-down resistor and Rising edge for the PNP output.
And I recommend using a +12V supply for Hall sensors, especially ZF ones.
and after configure properly, according to you sensor ouput type, recheck all timings with strobe light!!!
I will try the 12v supply. For the SNQ series I tried the pull down resistor but I get no signal at all then. The documentation for SNQ series specs a pull up 1k resistor. Not sure why exactly???
ok, im not found thease datascheet. use pullup and Falling (it is have least latency, and may be more precission rpm detection)
I have tried 12v power to sensors and no difference. It seems to me the secondary trigger is causing the primary trigger not to read when it gets pulled low. How is this possible? Maybe you cannot use 2 hall sensors for primary and secondary. Somehow the secondary trigger is interfering with the primary hall sensor counting? Does anyone have experience of using 2 hall sensors like this?
Update; I changed the secondary trigger type to a missing tooth from 1 tooth and it seems to work now without trigger errors. In the log its not showing the flag passing on the secondary trigger after the engine starts. Its there during startup but then its not there when engine running. Is this normal or should it be showing the flag passing passing the sensor?
try switch off advanced filter on secondary
