Delco Electronic Throttles - what makes them tick?

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Healey3000
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Delco Electronic Throttles - what makes them tick?

Post by Healey3000 »

Hi,

This whole "throttle blipping" for overdrive engagement has led me down yet another research rat hole - electronic throttles.

Delco seems to make quite a few that are very compact. They have a six pin connector, with two pins to the motor, and the rest to two out of phase TPS, for redundancy, I suppose. What kind of motor is it, if it has just two leads? A spring-loaded (throttle shut) motor that is PWM'd to an open position?

I wonder if they dispense with an idle control motor by simply actuating the throttle.

Thanks.
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Re: Delco Electronic Throttles - what makes them tick?

Post by jsmcortina »

It is a servo motor and you need a servo controller (with safety critical design) to operate it.

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dontz125
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Re: Delco Electronic Throttles - what makes them tick?

Post by dontz125 »

As James notes, it's a dumb 2-wire DC motor. Apply +/- voltage, it turns one way, apply -/+ it turns the other. The 2 TPS are for error trapping and are part of the safety system.

I have a small card that turns a PWM signal into something that will drive a 5-wire servo (2 motor wires + 3 for the SPS) for something like a Yamaha EXUP valve. I wouldn't even consider using it on a throttle - something goes wrong, and that throttle suddenly pins WFO as you're approaching a cross-walk full of nuns and orphans ...

Electronic throttle control is for those with deep pockets, both for safety design and testing, and for liability lawsuits.
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Healey3000
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Re: Delco Electronic Throttles - what makes them tick?

Post by Healey3000 »

Thanks to you both.

It's an interesting area and there are Safety Critical H-bridges just for this that are pretty sophisticated, with SPI interfaces for diagnostics and dual uC's. Not that I'm going to implement DBW but it's a good mental exercise. Bosch even gives you 3D models of their universal DBW throttles, to encourage you to tempt fate.

Nuns and orphans; funny!
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