2006.05.01
I don't get any reaction on the knock-indicaton. It shows max all the time unless you disables it, then it shows "1" and it may vary between 0 and 2.
Q: Is a certain firmware recommended when useing knock-sensor?
Q: Does any one got knock-sensor/indicator working?
I'm setting op the knock-sensor but I only got a 16MHz crystal with the board, and I see 4MHz is the normal setup. Q The "knock-chip" has a programmable-divider so it can also use a 16MHz crystal if it is set up, but where to set up/program this divider?
- If you have a few days time (and controller not clamped yet), fire an order to WebShop for a 4MHz crystal (select a resistor, or the knockkit since empty cart cannot be checked out.) Select IBAN method, you get for free.
- I'll be orderring some boards in a few days anyway.. I'll just ad a note about a extra 4MHz crystal.
A: You need to recompile firmware with the following line added to my_make: "MY_CONF += -D KNOCK_OSC=16", then the knock chip is initalized with the correct divider for the 16MHz crystal.
Thanks..
Knock-frequency around 7KHz.. from about 6,2-7,8KHz.
Engine: VW 1800 8v. 81mm bore, 86,4mm stroke.
I have connected the shield to GND outside the box, and connected the two wires to "knock 1 and -" ("ch. 0" in MegaTune).
knock-config
knock_conf=FF #0xFF=Enable knock detection and ignition retard. # MegaTune changes it to: FC
knock_sampling_window=e2
knock1_frequency=29 #6.94kHz
knock1_gain=14
knock1_integrator=11
knock2_frequency=00 #Disabled..?
knock2_gain=00 #How much gain is estimated to bee needed?
knock2_integrator=00
knock_threshold=50 #Threshold fore what?
knock_noise_scale=10
knock_max_retard=18 #6 degrees
knock_default_retard=08 #2 degress
knock_retard_step=04 #1 degree
knock_retard_delay=10 #240ms
knock_advance_step=02 #0,5degree
knock_advance_delay=10 #240ms
knock_minrpm=0F #1500rpm
knock_maxrpm=32 #5000rpm