DIYEFI.org Forum

That is certainly an interesting discussion! It's not open source, though, not with the current information available, the source of the software, the history of that supplier, and the lack of clarification provided on the licensing. Freescale has their own less-specialized code, call it a framewor...

This looks interesting. Drive by wire, and designed for Stage V emissions. Calling all petrolheads: Configurable aftermarket ECUs for sale! http://blogs.freescale.com/2011/06/07/calling-all-petrolheads-configurable-aftermarket-ecus-for-sale/ MPC5634 microcontroller based on Power Architecture techno...

Fred wrote:Yes, of course!

That's interesting. I think I'm going to call it a day.

- Jim

Do you mean that the "simulated injector pulse" is a PWM signal from the ARM to the LM1949?

https://lh3.googleusercontent.com/-k73sfh-VqnU/TgCv3qmMDcI/AAAAAAAAAu8/h0WtIZSifc4/s640/DSCF0294.JPG You can see an mbed board, its an ARM Cortex M3 microcontroller running at 100MHz... It is in charge of generating the pulses to drive the injector. https://lh4.googleusercontent.com/-YUHKejN3wl4/Tg...

Also note the CNG in Marco's video has a higher than average inductance, so that video isn't exactly the same as we would expect to see in a petrol LowZ. Do you mean impedance/resistance at DC? The impedance (which at DC is simply the resistance) is relevant to peak and hold current, and that's wha...

jharvey wrote:Also note the CNG in Marco's video has a higher than average inductance, so that video isn't exactly the same as we would expect to see in a petrol LowZ.

Do you mean impedance/resistance at DC?

- Jim

There is none, in a long term well developed design. However the traces and routing and noise control mechanisms MUST be right, and it's difficult to achieve that on a first cut. Hence it's not conservative enough for me at this time, which is the subject of this thread. Of course they have to be r...

However more recently I read somewhere that they were to be used in PWM mode. If that is true, which this implies, then all of my original comments stand. Please understand that it's not a criticism of the design or process, rather just an indication that it is not where I expected or wanted it to ...

There is a very brief 8MHz noise on the vertices of the ripple wave, caused by the fast change in the tantalum capacitor current. At those high di/dt, the ESR and ESL start to play an important role in the output signal, and the current variation generates the voltage seen in the output. In general...