Ignition updates to the Unofficial FAQ

Then how do you explain this?
http://www.tegger.com/hondafaq/misc/rov-ign.jpg
Look a the text immediately below the title.

Then I'm still looking for a definitive answer.

 

----- Original Message -----
From: "TeGGeR®" <0m>
Newsgroups: rec.autos.makers.honda,alt.autos.acura,alt.autos.honda
Sent: Saturday, June 04, 2005 8:37 AM
Subject: Re: Ignition updates to the Unofficial FAQ

That was how Jim got into the semantic trap to start with. The ECU supplies
a low current ground to pin 4, which grounds an input on the IC, but the
main ground - the one the coil current flows through - is the one shown in
the lower right corner of the ignitor; the metal body of the ignitor itself.
The current from pin 4 is undoubtedly in the range of 1 ma.

Mike

 

----- Original Message -----
From: "TeGGeR®" <0m>
Newsgroups: rec.autos.makers.honda,alt.autos.acura,alt.autos.honda
Sent: Saturday, June 04, 2005 8:37 AM
Subject: Re: Ignition updates to the Unofficial FAQ

That was how Jim got into the semantic trap to start with. The ECU supplies
a low current ground to pin 4, which grounds an input on the IC, but the
main ground - the one the coil current flows through - is the one shown in
the lower right corner of the ignitor; the metal body of the ignitor itself.
The current from pin 4 is undoubtedly in the range of 1 ma.

Mike

 

Yes,the ECU signal is a normally HI,LO(ground)-to-enable signal.

Thanks!

 

Yes,the ECU signal is a normally HI,LO(ground)-to-enable signal.

Thanks!

 

Yes, that is what I meant, and that is what the data sheet shows.

I did some more digging, and you are right, it is not an opto-coupler.
It is indeed a chip for controlling ignition coils. It is made by
Telefunken / TEMIC, and they had a family of 3: U2225B is used when the
input is from an inductive sensor, U2226B is intended for use with a
microcontroller / microprocessor and U2227B is used when the chip is
connected directly to an optical sensor. I have not had any luck finding
the data sheet for this part.

 

Yes, that is what I meant, and that is what the data sheet shows.

I did some more digging, and you are right, it is not an opto-coupler.
It is indeed a chip for controlling ignition coils. It is made by
Telefunken / TEMIC, and they had a family of 3: U2225B is used when the
input is from an inductive sensor, U2226B is intended for use with a
microcontroller / microprocessor and U2227B is used when the chip is
connected directly to an optical sensor. I have not had any luck finding
the data sheet for this part.

 

I've removed the innards of the igniter from the graphics and will add that
body round later on, changing the yellow and orange lines around to suit.
http://www.tegger.com/hondafaq/igniter-operation/index.html

Since the workings are far more detailed than I had originally imagined, I
will leave the igniter as a "here be dragons" blank box until somebody else
decides to supply a correct schematic for me to copy.

Thanks very much to all.

 

I've removed the innards of the igniter from the graphics and will add that
body round later on, changing the yellow and orange lines around to suit.
http://www.tegger.com/hondafaq/igniter-operation/index.html

Since the workings are far more detailed than I had originally imagined, I
will leave the igniter as a "here be dragons" blank box until somebody else
decides to supply a correct schematic for me to copy.

Thanks very much to all.