Hi everyone...been trying to figure this out how I would build this kind of circuit... its for a REALLY weird application so bare with me
I have a chevy truck with an allison automatic transmission...It is completely electronically controlled with 5 PWM solenoids and 1 PWM/VBS solenoid so nothing has to "physically" move in the trans to shift between any gear.
the shifter in the truck moves basically a simple selectable ground switch on the transmission that the trans computer interperates as driver shift signals
theres 4 normally open switches, A, B, C, and O. When grounded in in certain orders/logic correspond to certain "gear requests" from the driver.
For example, when the shifter is moved to "drive", it moves the positional switch which grounds A and P and leaves B and C open. Moving the shifter to "3rd gear" grounds out all 4 wires, etc....
ok so now that ive bored you guys with that heres what I want to do.
Instead of moving the shifter manually to "3" "2" or "1" (if I want to hold a gear and not have it shift automatically in "drive), I wanted to try to make some programmable IC that would control 4 SPST relays connected to each of the 4 signal wires. But the relays would be controlled in a specific order by two normally open momentary switches. So for example you press momentary switch #1, it will open relays 1 and 3, and close relays 2 and 4. Press momentary switch #1 again and it switches to the next sequence of opening relays 1 and 4 and closing 2 and 3. And on down thru 4 different combinations.
Then you press momentary switch #2 at any time and it will reverse the sequence and go back one step.
So basically press momentary switch #1 and it adjust the relays to make the transmission computer think I moved the shifter from "drive" down to "3", then press momentary switch #1 again and it changes the relays to a different combination to make the trans computer think I moved the shifer to "2" etc.. then at any time I can press momentary switch #2 and have it effectively go "up" one step in the sequence...
The goal being to make some IC/relays that acts as a sort of "tip-tronic" circuit with "upshift" and "downshift" buttons. I looked around google for complex programmable relays with 4 relay outputs and 2 analog inputs, but im not sure if I need something that complex...
Kinda wierd, but just something I wanted to mess around with cause no ones done it before
thanks again for the help
ben
I have a chevy truck with an allison automatic transmission...It is completely electronically controlled with 5 PWM solenoids and 1 PWM/VBS solenoid so nothing has to "physically" move in the trans to shift between any gear.
the shifter in the truck moves basically a simple selectable ground switch on the transmission that the trans computer interperates as driver shift signals
theres 4 normally open switches, A, B, C, and O. When grounded in in certain orders/logic correspond to certain "gear requests" from the driver.
For example, when the shifter is moved to "drive", it moves the positional switch which grounds A and P and leaves B and C open. Moving the shifter to "3rd gear" grounds out all 4 wires, etc....
ok so now that ive bored you guys with that heres what I want to do.
Instead of moving the shifter manually to "3" "2" or "1" (if I want to hold a gear and not have it shift automatically in "drive), I wanted to try to make some programmable IC that would control 4 SPST relays connected to each of the 4 signal wires. But the relays would be controlled in a specific order by two normally open momentary switches. So for example you press momentary switch #1, it will open relays 1 and 3, and close relays 2 and 4. Press momentary switch #1 again and it switches to the next sequence of opening relays 1 and 4 and closing 2 and 3. And on down thru 4 different combinations.
Then you press momentary switch #2 at any time and it will reverse the sequence and go back one step.
So basically press momentary switch #1 and it adjust the relays to make the transmission computer think I moved the shifter from "drive" down to "3", then press momentary switch #1 again and it changes the relays to a different combination to make the trans computer think I moved the shifer to "2" etc.. then at any time I can press momentary switch #2 and have it effectively go "up" one step in the sequence...
The goal being to make some IC/relays that acts as a sort of "tip-tronic" circuit with "upshift" and "downshift" buttons. I looked around google for complex programmable relays with 4 relay outputs and 2 analog inputs, but im not sure if I need something that complex...
Kinda wierd, but just something I wanted to mess around with cause no ones done it before
thanks again for the help
ben