Toymods Car Club Inc: Tech & Conversions => PARALLEL Twincharging, whatever....

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oldcorollas
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Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: PARALLEL Twincharging, lets make it work	Tue, 23 August 2005 09:00

MWP, have a read of my last post.. i think i just proved that it doesn't make much difference if you vent to ATM or to after T1... venting to after T1 makes the actual closing process a little easier i think... hmm, that may all come down to how the valves are actuated, and what 'logic'is used to change their position... hmmmm also showed that we aren't saving power by recirc.... maybe in that case, just closing T1 would be enough?? but then we have even higher pressure differential across the SC, so we would get some whopping great losses (well more.. imagine each time the lobes opened after pulling vaccum thru, we have 0.6L of 2bar air rushing to greet them...mmm can you say heat!!) my only concern with laptop is that it is not real time based (unless you did it in linux of course ) and this is something you would not want a half second hang time while bill gates does his shit... i guess there are heaps of micro-controllers and PIC's that could work.... i would want only one IC to be doing all the controlling.. so you can apply logic to all of the valves/gates at the same time... hmm, so we are sort of making a sooper-dooper-EBC then? hmmm.... then again, if we had wastegate actuators, we could just use the EBC's, but i foresee the need to actuate the throttles with no pressure to make actuators work... hrmmm.. Tricky, i agree, esp after playing with megasquirt, electronic stuff is soooo much easier to play with.. cool , heh heh, is amazing what uni degrees can be used for well, we would need a stepper for each throttle.. although from comments, maybe a wastegate could easily be used for T2.. so sayy two stepper motors, 90deg max movement, maybe 1 or 2 deg steps? doesn't need to be too fancy.. force?? enough to be able to open/close a valve against a lot of pressure.. mech engs? does a throttle plate experience a turning force when a pressure is applied against it? to me it seems like maybe a minimal turning moment due to slightly different amounts of air getting around the edges but.... still needs enough force to keep em closed/push against the spring pressure keeping them closed... i would want them commanded by a microcontroller (twincharge-ECU) that takes into account TPS position, manifold pressure and IC pressure (for controlling SC pressure with throttle and at cruise ), and maybe pressure between T3 and T1.. but thats about it really.. esp if T2 is a wastegate.. so 2 steppers, 3 pressure measurements and one TPS... the pressure and TPS are just 0-5V sensors, so thats easy to work with... maybe we can do that one also, so maybe 3 steppers, and 4 pressure measurments.. so either: 2 stepper outputs, 4 x 0-5V inputs.. or 3 stepper outputs, 5x 0-5V inputs. damn, is sounding easier all the time then all thats needed is to be able to set up tables and a LOGIC path to determine what opens how much when (ie stepper position vs pressure/TPS) and also things like testing stepper home position (tho if they are spring closed, the initial position could be set to home position), a commented program that is easy to change for laypeople (ie me ) with absolute pressure units and sensible variable names... noice!! i would rely on the driver not to be doing things when cold etc, and the ECU to correct for manifold temps.. hmm, MS2 has a stepper motor controller onboard, you could look into that chip.. it's SMD, but is compact and there may be a legged version heh heh, all it takes is time, coffee beer, and pizza in fact, if electronic control of steppers could be set up, then the whole thing with decel and cruise becomes very easy.. you could just set either turbo (for highway) or SC (for city) and things like that..... i think the basic idea of the throttles above can be used for all conditions.. and i guess the idea of this thread was initially to pick flaws in the system, and secondly to discuss operation logic.... thanks fellas we are makin progress!! [Report message to a moderator]

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