Search found 249 matches
- Mon Jun 27, 2011 6:19 pm
- Forum: Non-Free EMS
- Topic: Freescale is planning an Open Source ECU
- Replies: 16
- Views: 31002
Re: Freescale is planning an Open Source ECU
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...
- Mon Jun 27, 2011 10:40 am
- Forum: Non-Free EMS
- Topic: Freescale is planning an Open Source ECU
- Replies: 16
- Views: 31002
Freescale is planning an Open Source ECU
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...
- Mon Jun 27, 2011 10:23 am
- Forum: Puma
- Topic: Spin 2 Low-Z testing
- Replies: 18
- Views: 34775
Re: Spin 2 Low-Z testing
That's interesting. I think I'm going to call it a day.Fred wrote:Yes, of course!
- Jim
- Mon Jun 27, 2011 1:51 am
- Forum: Puma
- Topic: Spin 2 Low-Z testing
- Replies: 18
- Views: 34775
Re: Spin 2 Low-Z testing
Do you mean that the "simulated injector pulse" is a PWM signal from the ARM to the LM1949?
- Mon Jun 27, 2011 1:17 am
- Forum: Puma
- Topic: Spin 2 Low-Z testing
- Replies: 18
- Views: 34775
Re: Spin 2 Low-Z testing
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...
- Sun Jun 26, 2011 7:42 pm
- Forum: Puma
- Topic: Why The Latest Changes To Spin 2 Don't Worry Jared
- Replies: 24
- Views: 44631
Re: Why The Latest Changes To Spin 2 Don't Worry Jared
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...
- Sat Jun 25, 2011 11:30 am
- Forum: Puma
- Topic: Why The Latest Changes To Spin 2 Don't Worry Jared
- Replies: 24
- Views: 44631
Re: Why The Latest Changes To Spin 2 Don't Worry Jared
Do you mean impedance/resistance at DC?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.
- Jim
- Sat Jun 25, 2011 10:59 am
- Forum: Puma
- Topic: Why The Latest Changes To Spin 2 Don't Worry Jared
- Replies: 24
- Views: 44631
Re: Why The Latest Changes To Spin 2 Don't Worry Jared
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...
- Sat Jun 25, 2011 8:22 am
- Forum: Puma
- Topic: Why The Latest Changes To Spin 2 Don't Worry Jared
- Replies: 24
- Views: 44631
Re: Why The Latest Changes To Spin 2 Don't Worry Jared
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 ...
- Sun Jun 12, 2011 9:42 am
- Forum: FreeEMS Hardware Dev
- Topic: RFC: Switching mode power supply schematics
- Replies: 50
- Views: 67599
Re: RFC: Switching mode power supply schematics
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...