Hi guys, I am a huge fan of Arduino and big day dreamer who is tired of day dreaming, so I finally bought a Mega 2560 to bring my dreams to reality.
Problem is I've never programmed before.
Did Electronics/Mechanical engineering in school but that was before Arduinos.
If this topic has been covered before and I can be pointed into the right direction I would appreciate it.
I have a 5 speed automatic transmission I'd like to control also with possible paddle shift mode.
It has a total of 6 solenoids.
3 solenoids to shift 1st to 5th and back to 1st (1st-2nd/4th-5th uses the same solenoid) #4 solenoid is for Torque Converter Clutch #5 solenoid is for Modulated Pressure Control #6 solenoid is the Shift Pressure Control
(Solenoids here are not in any articular order)
I have played around with with some sketches and has basic understanding on it but I'm still learning other language aspect of the sketches.
The shift pattern of this transmission is as follows
GEAR | 40% duty cycle| 33%duty cycle
SHIFTS | 1-2/4-4 | 2-3 | 3-4 | MOD PC #5 | SHIFT PC #6 | TCC |
1ST --- OFF -- OFF - OFF - PWM OFF OFF
SHIFT --- ON -- OFF - OFF - PWM PWM OFF
2ND --- OFF -- OFF - OFF - PWM OFF PWM
SHIFT --- OFF -- ON - OFF - PWM PWM PWM
3RD --- OFF -- OFF - OFF - PWM OFF PWM
SHIFT --- OFF -- OFF - ON - PWM PWM PWM
4TH --- OFF -- OFF - OFF - PWM OFF PWM
SHIFT --- ON -- OFF - OFF - PWM PWM PWM
5TH --- OFF -- OFF - OFF - PWM OFF PWM
I am known to over engineer things. Did I make this too complicated?
Time to start daydreaming and determine the current necessary to operate each solenoid. Are they all the same type? Do they have one wire and use the transmission/engine for the other part of the circuit, or do they have two wires?
Does the computer control system on your car care if the transmission solenoids are disconnected? Does the engine speed up during a down-shift operation?
So, I guess you are not making it complicated enough!
The solenoids serves different purposes and has different values. All shift solenoids are the same and has the same resistance values of 2.5-6.5 ohms.
I am aware I would need additional circuits to power them.
The TCC solenoid is rated at 2-4 ohms.
The Modulating and Shift Solenoids are 4-8 ohms.
They all operate on the same voltage 11-14V. With Negative trigger.
So if I used the 12 volts and lowest resistance values;
Shift SOL would be 4.8A
TCC SOL would be 6A
MOD PRESS SOL 3A
SHIFT PRESS SOL 3A
Sorry I was not clear about my application in the beginning, I am retro fitting this transmission into an older car that is using a stand alone ECU.
It will be a turbocharged Mercedes, however a strong enough mercedes manual transmission is very difficult and expensive to come by.
The 722.6 5speed can handle upwards of 800nm approx 590ft lbs of torque. (The AMG 722.6 1000nm)
The original TCM receives information from the Shift Lever Assembly (which I also have), The shift Lever Assem is electronic/mechanical. P R N are mechanical while D 4 3 2 1 are electronically controlled by the TCM.
It uses 2 input speed sensors referred to as N2 and N3. Both speed sensors are located in the electrical conductor plate. The speed sensors are Hall Effect speed sensors that are used by the TCM to calculate the transmissions input speed.
The Engine Control Module and Anti-lock Brake System controllers over the CAN bus.My standalone ECM has CAN bus capabilities.
The engine does not speed up while downshifting.
.
Before we go any farther, are you going to use this automobile on a public highway or off-read, only? The reason I ask relates to your auto insurance policy. If you are involved with an accident with another person/automobile, will your insurance stand behind you, knowing you have modified the automobile? If not, do you have enough assets to protect the forum members from a law suit because we aided your modification?
Paul_KD7HB:
Before we go any farther, are you going to use this automobile on a public highway or off-read, only? The reason I ask relates to your auto insurance policy. If you are involved with an accident with another person/automobile, will your insurance stand behind you, knowing you have modified the automobile? If not, do you have enough assets to protect the forum members from a law suit because we aided your modification?
If the answer is "no", then I am gone.
Paul
No. This is strictly track or drag strip (mostly drag) that is why I would like to implement paddle shifting to possible increase shift reaction times.
Very important thank you for clearing that up.
The ECU that I am using is a Megasquirt 3 also designed for off roar use only, so I do understand your question and concern.
Do you know that there is firmware to us a Microsquirt for a transmission controller. I don't know if there is a program for your transmission, but if you go to the Megasquirt forum and the transmission controller section you should be able to find some info.
detown:
Do you know that there is firmware to us a Microsquirt for a transmission controller. I don't know if there is a program for your transmission, but if you go to the Megasquirt forum and the transmission controller section you should be able to find some info.
Thanks for replying sir.
I contacted DIY autotune regarding my build. Their current firmware would not yet work for my particular gearbox. Most of what they have so far can only control GMs and Fords.
I stalk them quite often hoping to see something new.
