am I wrong?

[mrlogix]

Another member pm'd me a question about the ecm and the closed loop operation. This is my my understanding.

The ecm has a set of data tables correlating, RPM, TPS %, Ambient temp, coolant/engine temp and sets the parameters for fuel ratio and ignition outputs. We will call this Open Loop Operation. This is the ecm having hardcoded (EEPROM ?) parameters (values) for running the engine when it's a cold start (Ambient vs Coolant/Engine temp) Wide Open Throttle (TPS Throttle Position Sensor %).

Once the bike has reached full operating temperature, a subroutine (program) becomes active that initiates data tables and mathematical expressions that modifies the preset (open loop operation) outputs to the ignition, fuel injectors and also subsystems such as cooling fans, etc., etc.

There are other subroutines running simultaneously in the background such as the controls and monitoring for errors non engine related (kickstand switch, battery load, dash display communications, etc., etc.

In normal traffic riding (again boring) this makes the fuel efficient, ecology friendly, riding mode that the normal motorcycle hobbiest will spend most of his time.

I am more interested in performance riding styles that use the engine at its optimum capability ( ), which means I am more interested in the open loop data tables and mathematical expressions for performance tuning (= acceleration rates )

 

[user_deleted]

^^^^^ john.....where the hell is the mighty ich when we need him?

 

[oh9bolt]

^[up][up]

 

[djs2k2]

Yes you are wrong" but to put my answer to your question in context, I didn't read the thread just wanted to make someone smile "!

 

[user_deleted]

Yes you are wrong"

john's posting way over my head so yes...i'll agree....he's all wrong. waiting for the beloved ich to respond.

 

[XLXB]

If you are married you are always wrong and happy or right and miserable.

If you are single well see above.

 

[heagachongoose]

Open loop is one way commands, ecm>engine

Closed loop is two way commands, ecm>engine & engine>ecm which is self adjusting.

Open loop, set it and that's it.
Closed loop adjusts itself according ti sensory feedback fir "optimum" performance.


But yes. Lol

 

[user_deleted]

If you are married you are always wrong

that's what she said

 

[djs2k2]

Man I am not sure if I started something here or if it was a coincidence? That being said I love being a smart a$$ for comedic value!

 

[Theycallmecrash]

I saw the title and answered in my head "yes, you are" then i read the thread. Now waiting for ich

 

[lawdog]

When it comes to Ich you are wring regardless as he just responds to annoy people.

Are you interested in learning how to tune? The great thing about our bikes with the eeproms being mapped out we can adjust anything!

Most people adjust the fueling tables. Within the tables are the closed loop regions and closed loop learn regions. Some will also turn off closed loop operations and just richen up the entire map.

Ecmspy did a fantastic job with their write up explaining how it works. I am on my phone otherwise I would link it.

One of these days if I ever get around to it I will do a write up of how I tune with my wideband.

 

[mrlogix]

I am a robotics engineer and do a lot of controls (PLC/HMI) programming to integrate equipment and processes. I am trying to apply/leverage that into 'tuning'. The explanation above is a very basic explanation/understanding as I know it. I am more interested in the hard coded (open loop maps) than the self learning, closed loop modes. I understand (do I?) the transition from part throttle to full throttle is a combination of the two modes, When I used to play with the tuning on my cars I used exhaust gas temps and a lot of spark plug reading to verify fuel distribution and AFR for wide open throttle The 'tuniversity' is closed and I am trying to get a handle on this. I picked up one of the Bluetooth modules from the group buy this winter on the forum and have downloaded TunePro RT. Plan on doing a lot of data logging this summer so when my other engine is finished I can tune and maximize for the mods I have performed.

So okay ich, what says ye? I patiently wait.......with translation if he goes all nien, nien nien on me.