Hi, I am new to the forum and have a similar issue to the person who originally posted this thread http://forum.allaboutcircuits.com/showthread.php?t=30362. Unfortunately he never posted back so who knows what he did.
I have just carried out an engine conversion on a BMW and am stuck with trying to convert the engine tach signal into a signal needed by the BMW ECU for use on other systems such as cruise control, tach drive etc...
The engine tach signal is a 4 pulse per revolution 5v square wave signal but the signal required by the ECU is a 58 pulse 2 pulse gap 5v square wave signal commonly known as the 60-2.
The issue I have is that I need the converted signal to rise in relation to the 4 pulse input, so as the engine speed increase the frequency of the converted signal will need to increase, as well as having the 2 pulse gap every revolution.
As i'm sure you guys hear all the time, when it comes to electrics you guys are in a different league and I will definately need things explaining in laymans terms.
Any help would be greatly appreciated, thanks Dan
I have just carried out an engine conversion on a BMW and am stuck with trying to convert the engine tach signal into a signal needed by the BMW ECU for use on other systems such as cruise control, tach drive etc...
The engine tach signal is a 4 pulse per revolution 5v square wave signal but the signal required by the ECU is a 58 pulse 2 pulse gap 5v square wave signal commonly known as the 60-2.
The issue I have is that I need the converted signal to rise in relation to the 4 pulse input, so as the engine speed increase the frequency of the converted signal will need to increase, as well as having the 2 pulse gap every revolution.
As i'm sure you guys hear all the time, when it comes to electrics you guys are in a different league and I will definately need things explaining in laymans terms.
Any help would be greatly appreciated, thanks Dan