Hi Folks,I posted this some time ago when the ban on automotive questions was in force. Although I deemed it test gear and not a mod I never got to pursue the project.
I need some help. I have checked the archives and can only find time interval pulse delay circuits.
I have two wheels driven together at 2:1 ratio. Wheel 1 spins at twice the speed of wheel 2.
Wheel 1 is toothed and generates regular pulses with a missing tooth to indicate position. Sensor is either a magnetic coil or Hall effect type.
Wheel 2 turns at half the speed of wheel 1 - rate of rotation is approx 10 times/sec to 60 times/sec. It has a marker tooth which generates a pulse by switching a Hall effect sensor.
I need to advance & delay the pulse from wheel 2 by -10 Deg of angular rotation to + 10 Deg of angular rotation. The angular shift to remain steady irrespective of speed of rotation.
What I am actually trying to do is make a simulator for a stretched timing chain in an engine. By varying the phase angle of the camshaft pulse I would be able to determine whether it is the chain or the chain tensioner that is in trouble.
I know that an oscilloscope would allow me to see what is happening, but without a good waveform to start with it, it would be next to impossible to make a confirmed diagnosis. This way I can adjust the "apparent valve timing" ie what the ECU sees, electronically and increase or decrease the angular offset until such time as a diagnostic trouble code is set. That way I can exactly determine the true mid point.
I was hoping I would be able to achieve a - 10 deg delay by shifting the pulse from wheel 1 and the + by shifting the pulse on wheel 2 - effectively two circuits, only one operating at any given time.
I would prefer to avoid using a software based solution but if I have no option I will accept all suggestions.
Thanks in anticipation
I need some help. I have checked the archives and can only find time interval pulse delay circuits.
I have two wheels driven together at 2:1 ratio. Wheel 1 spins at twice the speed of wheel 2.
Wheel 1 is toothed and generates regular pulses with a missing tooth to indicate position. Sensor is either a magnetic coil or Hall effect type.
Wheel 2 turns at half the speed of wheel 1 - rate of rotation is approx 10 times/sec to 60 times/sec. It has a marker tooth which generates a pulse by switching a Hall effect sensor.
I need to advance & delay the pulse from wheel 2 by -10 Deg of angular rotation to + 10 Deg of angular rotation. The angular shift to remain steady irrespective of speed of rotation.
What I am actually trying to do is make a simulator for a stretched timing chain in an engine. By varying the phase angle of the camshaft pulse I would be able to determine whether it is the chain or the chain tensioner that is in trouble.
I know that an oscilloscope would allow me to see what is happening, but without a good waveform to start with it, it would be next to impossible to make a confirmed diagnosis. This way I can adjust the "apparent valve timing" ie what the ECU sees, electronically and increase or decrease the angular offset until such time as a diagnostic trouble code is set. That way I can exactly determine the true mid point.
I was hoping I would be able to achieve a - 10 deg delay by shifting the pulse from wheel 1 and the + by shifting the pulse on wheel 2 - effectively two circuits, only one operating at any given time.
I would prefer to avoid using a software based solution but if I have no option I will accept all suggestions.
Thanks in anticipation