drive by wire

[Kamuto]

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]

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]

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]

No! You just can't use injector pwming.

[Kamuto]

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

[GintsK]

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]

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]

? 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]

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

[Kamuto]

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]

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