драйвер форсунок - что-то не так? injector driver issue?

[ItaloManyak]

Итак, а что если АФР скачет ибо правильно? И ещё провальчик обусловлен недоливом а ?

Смотрим:

3.jpg

4.jpg

1.jpg

2.jpg

[kb1gtt]

Perhaps this webpage will help with the above pictures.

http://code.google.com/p/daecu/wiki/Injector_driver_theory

[sasha.kams]

Может на форсунку сигнал катушки зажигания подали?

[AndreyB]

here are I believe NEC C5664 chips soldered on rusEfi Frankenso board:

[AndreyB]

@:

The translated text didn't mean much to me. I guessed from the pictures he was concerned with the 40V spikes, which is normal operation for this injector driver, but it seems he has some other problems, as the wave form doesn't seem to be correct. What is his hardware? Is he using a Frank board? I see some pulses that appear to indicate he's trying some kind of PWM on the injector like it's doing a push and hold kind of thing. Where are his scope probes connected? I'm missing many details.

короче нужно всё-таки подробнее расписать, что именно смущает. А я пока пойду куплю себе пачку nec C5664

[ItaloManyak]

Меня не волнует 40V потому что это электромагнитная индукция, на форсунках она может и до 60V прыгнуть это не суть важно.Это не шим инжектор это всё тот же PB9->U411-> по умолчанию это выход на форсунку #11. Я верю что проблема связана с протеканием тока, к сожалению в спешке я забыл посмотреть это.В результате работы с5664 смог открыть старую VAG форсунку при 3 барах на таком малом времени впрыска на котором она просто вообще не льёт и не должна лить, причем объем налитой жидкости примерно совпал с рассчетным.

[AndreyB]

I am probably a broken phone here, but I guess the question here is
not-rusEfi - flat line:



rusEfi - the line is not straight, the injector is starting to close pretty much right after it opens?

[kb1gtt]

This is the normal and expected injector pulses. Blue is the PB8 on STM, yellow is the injector 11 on Frankenso Harness. Scope GND straps are on STM GND.

Injector_5mS_rising_edge_DCprobe.png

The below is zoomed in to see the fast edges of the voltage clamping at about 40V.

Injector_5uS_falling_edge_DCprobe.png

Take note the scope needs to be in DC coupling. Some scopes will warp the signal when in AC coupling.

scope_DC_coupling.png

[kb1gtt]

It appears the concern might be when provided a 2mS pulse. See below. Yellow is the injector at the harness connector, blue is PB8 on STM.

Injector_2mS_rising_edge_DCprobe.png

I need a data sheet for NEC C5664. It appears that chip is a transistor instead of a MOSFET. You may need to drive the C5664 with a stronger drive then the STM can provide. You may need to change R423 to 0R and remove R424. However that's speculation and I really need more data to help provide an answer. The above pictures I posted used a ST VNS14NV04. I believe the short pulse problem is caused by the C5664.

[ItaloManyak]

This is what i have about c5664

c5664.jpg

drv.jpg

This is how it's look like on the Board

rusefiDRV.jpg

[puff]

just google mosfet vs npn

[kb1gtt]

If I believe my non_calibrated DSO quad, it looks to drive with 2.25V. Drop about .7V across the base means it can drive with up to 1.55 volts. With a hFE of as low as 300 and to maintain a 3A drive, you need to drive the base with at least 3.3mA. So 1.55/.0033 = 470 ohms max. I'm assuming you have used the OEM resistors, so you should have 20 ohms installed, which should drive you into saturation in a static situation. However the drive circuit was not designed for NPN drive, the current can cause impedance matching tuning issues. For example, as the collector starts to flow current, it can back feed the base current, requiring either a higher drive voltage, or an increased current drive to keep the transistor into saturation.

It appears to claim 100MHz NPN. It might not work very well at low frequencies. I also wonder why an automotive injector driver needs 100MHz. I suspect that datasheet has errors.

[AndreyB]

1.jpg

Here we see DC mode in the corner. Does it mean we are in 'DC coupling'? Is it possible to be in DC mode and in AC coupling mode? Mode and coupling - are these the same thing or not?