EMS for electronic OM606 engines
EMS for electronic OM606 engines
The throttle bodies in Ford products use DC motors with gear reduction and return spring force, not steppers. There are redundant TP sensors that you can log for both the pedal and the body. The sensors are biased opposite (one 5v closed and 0v WOT, the other sensor is vice versa) so that a possible short between the signal wires can't override failsafe. On inspection, I suspect that this is just an encoder which is a good idea. They can be made tiny and reliable. The reason I'm talking about Ford crap is because it's good to know how the O.E.'s are doing it so you might be able to identify a safety risk when you deviate from their setups. The DC motor with gear reduction and dual return springs is too elaborate and large but probably safest. A stepper seems to be ticket.
One of the failsafe modes could include applying vacuum to the shutoff valve just in case you can't return the stepper to the idle position.
raysorenson
04-23-2013, 11:38 AM #35While this thread has me thinking of how I can put an OM606 pump and sensors on my 603, I'm still thinking about converting a mechanical pump to DBW.
The throttle bodies in Ford products use DC motors with gear reduction and return spring force, not steppers. There are redundant TP sensors that you can log for both the pedal and the body. The sensors are biased opposite (one 5v closed and 0v WOT, the other sensor is vice versa) so that a possible short between the signal wires can't override failsafe. On inspection, I suspect that this is just an encoder which is a good idea. They can be made tiny and reliable. The reason I'm talking about Ford crap is because it's good to know how the O.E.'s are doing it so you might be able to identify a safety risk when you deviate from their setups. The DC motor with gear reduction and dual return springs is too elaborate and large but probably safest. A stepper seems to be ticket.
One of the failsafe modes could include applying vacuum to the shutoff valve just in case you can't return the stepper to the idle position.
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