MembersPage/SkassaSubaruNewtrigger (2010-05-27 22:08:12)

This page contains all test of the new Subaru Trigger code


28/5-2010

Did some more test today.

Status car is not running.

All test results vile be published Saturday


What we have seen 2010-05-24

We have stable 160 rpm at cranking fuel pump off.

When we cranking the car it´s stable in beginning it fires up to 300-600 rpm then random fires and rpm is no longer stable.

Its like it runs only on two cylinders (firing correct) but then losing sync.

We see some correct firing´s but also ignition fires at different times than it should. Obviously there is noise in the signal, that must be filtered.

Question: Haw is this code tested and what signal is used?

We have big trouble scoping the output of LM1815 because of the short signal like 15 micro sec. It should be a bit higher (20-30 usec), but you can enlarge it very easily, see below.

I would suggests that we use the p259 led´s output. When the processor get signal from lm1815 Pre/sec trigger we set the output high for 0.5 sec. This will give us a chance to see and measure what goes in and out of lm1815.

Triggerlog also shows the time of the pulse (although currently for the primary trigger only).

Watching the input with analog scope is of primary importance. Even if the output is perfect, if the input is on the edge, it can break any time (eg. in cold).


Analog scopeshots ? do you have some ?

http://www.syvecs.com/forum/viewtopic.php?f=6&t=110&p=474&hilit=trigger+pattern+advisory+note#p474

If the input is biased properly, the LM1815 adaptive filtering should filter out small amplitude "phantom-tooth" pulses in the subaru. I didn't see your scope so only you can judge the offending amplitude. 10-30% should not trigg, and with lower R181 / R182 even higher amplitude offenders can be filtered out

Maybe the noise is capacitively injected by ignition ? It could save a LOT of time (even 1 week) to route the VR signals via properly shielded cable (with ground wire inside, and shield connected to ground only on ECU side). Than only try the factory harness when it works well with the separate shielded cable so you have a good starting point reference.


Ideas - setting up more agressive filtering for this low toothcount


Subaru_1.jpg

New Vems pcb installed

Subaru_2.jpg

Our technical engineer trying to hunt down the errors

Subaru_3.jpg

Test car 600 Hp HKS Subaru