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#41
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"Michael Pardee" > wrote in
: > ----- Original Message ----- > From: "TeGGeR®" > > Newsgroups: rec.autos.makers.honda,alt.autos.acura,alt.autos.h onda > Sent: Saturday, June 04, 2005 8:37 AM > Subject: Ignition updates to the Unofficial FAQ > > >> Jim Yanik .> wrote in >> : >> >> >>> >>> Something additional I thought of after I sent the last >>> post(sorry!); The ECU does not ground the igniter module.It only >>> sends a signal (to the control IC inside the igniter)for the >>> Darlington to ground the coil. >> >> >> Then how do you explain this? >> http://www.tegger.com/hondafaq/misc/rov-ign.jpg >> Look at the text immediately below the title. >> > > 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! -- Jim Yanik jyanik at kua.net |
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#42
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Jim Yanik wrote: > > Randolph > wrote in : > > See > > http://www.st.com/stonline/books/ascii/docs/5288.htm for details. The > > data sheet is at http://www.st.com/stonline/books/pdf/docs/5288.pdf. The > > data sheet shows the diode between emitter and collector. > > The diode is INTERNAL to the transistor package. > Probably on the same substrate as the xstr. Yes, that is what I meant, and that is what the data sheet shows. > > The IC in the photo looks like it has part number U2226B, and a good > > guess is that the TFK in the first line stand for Telefunken, a German > > semiconductor manufacturer later renamed TEMIC and eventually bought by > > Vishay. I have not found any data sheet for the U2226B, but I believe it > > is an opto-coupler. > > > > I found ICs that were specifically designed for ignition control and > driving the Darlingtons,but none with the same pin count of the IC > pictured,nor any similarity to its part number. > I do not believe it's an optocoupler,but a full control IC.Probably with > circuitry to square up(shape) the drive pulse,and provide enough drive > current,and IIRC,the ICs monitored and regulated coil current.(that would > enable faster switching) 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. |
#43
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Jim Yanik .> wrote in
: <snip> >> 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. > 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/ignit...ion/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. -- TeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
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