Search found 98 matches

by Nobody
Tue Sep 02, 2014 9:27 pm
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16101

Re: MAP but not SD as intermediate solution?

I have to agree with the approach to keep it simple at first, add complexity only if required. On my engines, the system I use is very basic. MAP is sampled once every 8 milliseconds. There is no attempt to synchronize it with any particular crankshaft position. There is no averaging of readings. T...
by Nobody
Tue Sep 02, 2014 9:20 pm
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16101

Re: MAP but not SD as intermediate solution?

I think we are saying nearly the same thing. We agree there are better algo's for predicting how much O2 there is in the cyl. The difference is that I'm encouraging a get'er done approach, with enhancement options down the road. I understand that OEM MAF is designed to have a "linear" region. A cur...
by Nobody
Tue Sep 02, 2014 3:14 am
Forum: Hardware
Topic: Mazda ECU on a bench
Replies: 10
Views: 3281

Re: Mazda ECU on a bench

Likely bouncing off of a sanity check...
by Nobody
Tue Sep 02, 2014 3:11 am
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16101

Re: MAP but not SD as intermediate solution?

OEM's often have those extra cavities to muffle the pulses. This quiet's the motor as well it dampens the signal seen by the up stream sensor, removing much of the pulse. A MAP that is really close to the intake is not so fortunate. These pressure pulses are one of many reasons why the min is often...
by Nobody
Tue Sep 02, 2014 1:00 am
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16101

Re: MAP but not SD as intermediate solution?

Keep in mind that some modern engines have pseudo Atkinson cycle, such as Mazda Skyactiv in which they claim 14:1 CR. In most cases they are bleeding off compression ratio by closing inlet valve late, so some air is returned back to intake manifold, effectively creating 2+ higher pressure pulses (re...
by Nobody
Mon Sep 01, 2014 10:54 pm
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16101

Re: MAP but not SD as intermediate solution?

What optimum sampling method is, will depend on many variables even intake manifold design. Most current intakes have runners tuned for ~3rd order resonance and large plenum volumes. Large plenum volumes dampen pressure variations. Not sure why older Japanese engines has such wimpy plenum volumes? A...
by Nobody
Tue Aug 26, 2014 1:59 am
Forum: Misc
Topic: who is bot?
Replies: 1
Views: 991

Re: who is bot?

It's tracking your every move online as we speak LOL. If you have Gmail account then nothing new...
by Nobody
Mon Aug 25, 2014 3:59 pm
Forum: Your car & your engine
Topic: Mazda Eunos NA model
Replies: 7
Views: 1717

Re: Mazda Eunos NA model

If you put “Engineering Sample”, “Evaluation” or “Educational” and assigned value of $50-75, most countries will let it go through.

Also electronic components are exempt from duties in most countries, just have to know classification.
by Nobody
Mon Aug 25, 2014 4:27 am
Forum: Misc
Topic: Maybe new rusefi target? TMS570
Replies: 96
Views: 23021

Re: Maybe new rusefi target? TMS570

First I realize that AEC Q100 is not limited to temperature and guarantied performance across the board, but regrettably that is the focus here (rusEFI), and memory error detection, latch-up resistance, safety considerations… don’t get factored in. As far as ISO certification, I’m currently living i...
by Nobody
Sun Aug 24, 2014 9:19 pm
Forum: Hardware
Topic: Frankenso - ECU shield compatible with OEM case / official
Replies: 529
Views: 117538

Re: Frankenso - ECU shield compatible with OEM case

You sure have the knowledge to show the right direction, but do you have time to implement the right ideas? Yes stm32f4+ChibiOS is not the perfect platform. I would love to join another effort which would be build on a better foundation. I can be convinced to shift rusEfi foundation towards a bette...
by Nobody
Sun Aug 24, 2014 9:14 pm
Forum: Misc
Topic: Maybe new rusefi target? TMS570
Replies: 96
Views: 23021

Re: Maybe new rusefi target? TMS570

It provides most, if not all the functions some of the Freescale and ST processors provide. And the cost of the LP board ($20 USD) and software tools (free) is hard to beat. RE: documentation and such mentioned previously. TI's E2E forums are great resources where TI employees and engineers are oft...
by Nobody
Sun Aug 24, 2014 2:55 am
Forum: Hardware
Topic: Frankenso - ECU shield compatible with OEM case / official
Replies: 529
Views: 117538

Re: Frankenso - ECU shield compatible with OEM case

Why no pull-up for TPS on the schematics? http://i.imgur.com/CM5xWgg.png A guy from AVR freaks makes a fair point that with floating input we would not be able to detect TPS disconnect - see http://www.avrfreaks.net/index.php?p=1180690#1180690 He is also insisting on software signal filtering for T...
by Nobody
Wed Aug 20, 2014 5:06 am
Forum: Hardware
Topic: Frankenso - ECU shield compatible with OEM case / official
Replies: 529
Views: 117538

Re: Frankenso - ECU shield compatible with OEM case

Did you check all your grounds? Are they connected to a common point? Is wire gauge on new ECU sufficient? I am using the stock harness as is, I did not check anything on the car other then unplug stock ECU and plug my ECU. There are at least five GND wires coming into the ECU - x2 power GND, x1 lo...
by Nobody
Wed Aug 20, 2014 4:57 am
Forum: Hello World
Topic: Hello all
Replies: 17
Views: 3438

Re: Hello all

About ASM programming, might you have interest in the ETPU for this SPC56x series of chip? It doesn't have an easy to obtain compiler, so it's programmed via ASM. http://www.st.com/web/en/catalog/tools/PF259195 Using it is on the long term goals, for a variety of reasons. The compiler has been a si...
by Nobody
Tue Aug 19, 2014 8:23 pm
Forum: Hardware
Topic: Frankenso - ECU shield compatible with OEM case / official
Replies: 529
Views: 117538

Re: Frankenso - ECU shield compatible with OEM case

This is a back to basics kind of question. Did you check all your grounds? Are they connected to a common point? Are the engines ground strap(s) OK? Is wire gauge on new ECU sufficient? When strange electrical issues hit, that is first place I look at. On an engine swap out I forgot head ground stra...
by Nobody
Tue Aug 19, 2014 6:33 am
Forum: Hardware
Topic: Frankenso - ECU shield compatible with OEM case / official
Replies: 529
Views: 117538

Re: Frankenso - ECU shield compatible with OEM case

How is it wired and anything going to ECU? It is very likely a PWM to control shift pressure and that's it's base frequency. The other output is for torque converter lockup, that is usually ECU driven in light load situations. If your having problems that are derived from TCM sitting idle, then well...
by Nobody
Thu Aug 14, 2014 1:24 am
Forum: Software
Topic: Self-diagnostics todo/dreams
Replies: 9
Views: 3404

Re: Self-diagnostics todo/dreams

.
by Nobody
Wed Aug 13, 2014 7:02 am
Forum: Software
Topic: Self-diagnostics todo/dreams
Replies: 9
Views: 3404

Re: Self-diagnostics todo/dreams

.
by Nobody
Wed Aug 06, 2014 2:46 am
Forum: Misc
Topic: Contributions licensing
Replies: 12
Views: 10446

Re: Contributions licensing

The more I look into this the more I realize how non-trivial this issue is :( I have added a note that contributions have to agree to waive their copyrights. Obviously this is all pretty lame and it would all be up to who has a better lawyer anyway :) It only makes a big difference if you plan on c...
by Nobody
Wed Aug 06, 2014 2:30 am
Forum: Your car & your engine
Topic: Alfa Romeo Engine AR32301
Replies: 13
Views: 5166

Re: Alfa Romeo Engine AR32301

http://i1.ytimg.com/vi/BiC-QY8N71Q/maxresdefault.jpg Cool little engine... It's actually a twin spark (2 spark plugs per cylinder) engine, one in center of combustion chamber and other offset to side in "squish" area. It' looks like it started as a typical 4-valve per cylinder head that couldn't pa...
by Nobody
Sat Aug 02, 2014 4:41 am
Forum: Software
Topic: RTOS options
Replies: 33
Views: 10191

Re: RTOS options

Image
Not sure if you found this?
by Nobody
Sat Aug 02, 2014 1:46 am
Forum: Hardware
Topic: stimulator board
Replies: 182
Views: 38736

Re: stimulator board

By putting a capacitor in series with digital output it will become a AC square wave if toggled at a reasonable frequency. This is how single supply cheepo audio amplifiers work, cap in series to speaker +.
by Nobody
Sat Aug 02, 2014 1:38 am
Forum: Software
Topic: RTOS options
Replies: 33
Views: 10191

Re: RTOS options

I did not use Arctic Core because they contradict themselves on License terms. Having already developed drivers over time and happy with them, I just wanted OS with minimal HAL implementation required (main timers and counters)… The version I’m using is cross between OSEK and TurboOSEK (latest OSEK ...
by Nobody
Fri Aug 01, 2014 10:36 pm
Forum: Hardware
Topic: stimulator board
Replies: 182
Views: 38736

Re: stimulator board

Are you using MAX232 to simulate VR output? If you need 0 crossing you can just put capacitor in series, that may work.

Yes you need caps, it's for charge pump circuit.
by Nobody
Fri Aug 01, 2014 10:25 pm
Forum: Software
Topic: RTOS options
Replies: 33
Views: 10191

Re: RTOS options

Well AUTOSAR compliant OSEK up and running on two MPUs MPC5634M (80 MHz) and MPC5644A (150 MHz dual issue core). Can’t say it was fun, but not that bad at all, everything playing nicely even TPU with Extended Tasks. Alarm management is actually fairly flexible, you can setup xxx events per unit of t...
by Nobody
Thu Jul 31, 2014 4:05 pm
Forum: Hardware
Topic: Frankenso - ECU shield compatible with OEM case / official
Replies: 529
Views: 117538

Re: Frankenso - ECU shield compatible with OEM case

Yes I noticed noise in capture too.

Given the CPU likely consumes less than 100ma wonder if switcher does not have enough load to be stable? I've seen this too many times. Maybe a add parasitic load and see if it improves.
by Nobody
Thu Jul 31, 2014 3:59 pm
Forum: Your car & your engine
Topic: 1995 Honda Accord - auto, vtec (#5)
Replies: 46
Views: 23779

Re: 1995 Honda Accord - auto, vtec

Given the year, it likely has engine bay fuel pressure regulator. If it does, pull off vacuum reference line and check for fuel, if any is present then diaphragm is torn (try this after cranking). Long cranks can often be fuel pressure related.