drive by wire

Kamuto · September 11, 2013, 09:01:06 PM

ok, one stupid question, for drive by wire throttle which outputs can be used? only injector outputs or maybe any other? asking this because I need to run it on v8 engine :)

GintsK · September 12, 2013, 06:23:10 AM

Seems no any common output. It uses injector pwming signal translocated to drive external hardware with H-bridge. So lots of hardware modifications necessary.

Gints

Kamuto · September 12, 2013, 10:16:38 AM

Quote from: GintsK on September 12, 2013, 06:23:10 AM
Seems no any common output. It uses injector pwming signal translocated to drive external hardware with H-bridge. So lots of hardware modifications necessary.

Gints

so that means injectors in pairs on v8 if I want to use dbw :(

GintsK · September 12, 2013, 12:03:16 PM

No! You just can't use injector pwming.

Kamuto · September 12, 2013, 03:23:33 PM

I mean if I want dbw on v8 i dont have enough injector outputs to drive throttle and 8 injector outputs

GintsK · September 12, 2013, 06:34:18 PM

Injector PWMing signal is not INJ output. It's a different signal. Take a look to VEMS schematics: pin14 of Atmega. So you can still go fully sequential.

Kamuto · September 12, 2013, 08:59:47 PM

Quote from: GintsK on September 12, 2013, 06:34:18 PM
Injector PWMing signal is not INJ output. It's a different signal. Take a look to VEMS schematics: pin14 of Atmega. So you can still go fully sequential.

and that means free ignition output for dbw or maybe even second wideband heater for that.

GintsK · September 13, 2013, 03:14:57 AM

? For driving DBW we need H-bridge. PWM driven, = not existing stepper chip. So 2 pairs of powerful transistors (2xPNP, 2xNPN) + electronics. External board.
In addition - we have to prepare some analog inputs with filters. Like TPS input have. And one output for safety relay. More safe would be to not use P259 chip for it.

Gints

Kamuto · September 13, 2013, 01:20:44 PM

Ok, can someone give shematics for it ? I'll try to make it working

Kamuto · September 13, 2013, 08:23:49 PM

http://www.pololu.com/catalog/product/1392
this one I'm using seems not having 4 powerfull transistors. I'm thinking will it work from that vems 500hz output he is supporting Frequency/tachometer digital input up to 2 MHz with 1 ms PID period.
(Open-loop control with no feedback also available.) open loop with no feedback would work I think.

krzycho-g · December 14, 2013, 08:39:25 AM

I join the question of a scheme can be described as a block that outputs are used for what.

I searched the forum and vems.hu and found nothing

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drive by wire