DBW for delco

[vlad01]

Was just having a bit of a brain storm about other possibilities for the humble delco.

Imagine adding DBW actuators running off flex tables to serve various functions like boost control valves/blow off, incorporating them into variable intakes, plenum cross overs, SC bypass etc..

I have see some really cutting edge uses for DBW actuators on the engine other than just a throttle.
What would be cool is a DBW actuator controller that uses PWM as the input.


Just some ideas really.

[Dylan]

Ive thought about trying a drive by wire throttle a few times from maybe a flex output.
Maybe wire the tps off the accelerator pedal. Looks like an LS electric tbrottle body could be adapted pretty easily to most intakes.

[vlad01]

Ive thought about trying a drive by wire throttle a few times from maybe a flex output.
Maybe wire the tps off the accelerator pedal. Looks like an LS electric tbrottle body could be adapted pretty easily to most intakes.

not that easy, an actuator is just a DC motor and usually a ganged pair of TPSs used for feedback and safety. So you need a H bridge driver to operate the motor and something that uses the TPSs for fail safe and calibration etc.... So a Delco has no way of running one out of the box. OEM use either a TAC module or its built into the PCM, its all analouge as far as inputs and outputs from the pedal and actuator. No PWM is used as far as I can find.

Here is some info I found.

http://www.msextra.com/forums/viewtopic ... 67&t=52488

and how GM DBW is.

http://chevythunder.com/drive_by_wire.htm

[buzzard]

The throttle motor drive signal is PWM with PID feedback control. H-Bridge is easy to implement
from PWM output however the PWM frequency is not adjustable on the Delco.

[buzzard]

Also you will not have the safety features required to make this acceptable for road use.
Have a look at a GM TAC module

[vlad01]

Also you will not have the safety features required to make this acceptable for road use.
Have a look at a GM TAC module

Its not for throttle use as mentioned in the first post, rather features used in forced induction and variable intakes.

No one would actually want DBW throttle, the very thing it's useless at.

[buzzard]

Also you will not have the safety features required to make this acceptable for road use.
Have a look at a GM TAC module

Its not for throttle use as mentioned in the first post, rather features used in forced induction and variable intakes.

No one would actually want DBW throttle, the very thing it's useless at.

My apologies, I didn't read the first post correctly. There is an application very similar to this on the RX8 intake manifold.
The auxiliary port valves (intake) are run by a motor driving a rack and pinion . Using a PWM H-bridge I drove the valves
open, then stopped the motor using a timer, drove it closed and stopped using the same timer.

The difficulty with the Delco 12P is the lack of capability in this regard. There is no provision for timers, feedback PID or multi PWM frequencies. The Delco, tho very good is behind as compared to good aftermarket systems

[vlad01]

hence why a controller was the idea. Im thinking the PWM DC% is translated to % open by the controller and it takes care of PWM frequencies and self calibration etc..