bosch DBW

I have a bosch dbw throttle which i am using to open a set of 4age silver top itbs, and i want to check that my linkage works. is there any safe way to power the dbw up to open and close without hooking it up to an ecu

To test correctly you would really need an ECU so the bridge output can control the motor based on the position sensors.

Definitely do not connect the servo motor directly to a battery as you will end up damaging the internal components.

yes, i thought that might be the case.

also, i am using both TP sensors in the pedal and the bosch DBW should i also run the ITB throttle position sensor output to the ECU as an added safety

Chris,

As a rule I never turn down available data if I have the input/output available to receive it.

In this particular case, being able to see the relationship of your DBW motor and actual ITB position, seems very helpful and I would definitely do it.

Depends on what ECU is controlling the servo motor.

What you actually care about is the position of the motor and the two sensors are for error checking.

If you have the two sensors in different locations they might move relative to each other in operation and lead to a fault state.

Im going to contradict the other comments a little and say in most cases you dont want to use the sensors on the motor. Instead you should fit a dual-track sensor or two separate sensors on the ITB throttle shaft(s). Throttle position is what you are trying to control, throttle position is the important metric for engine control, and throttle position is the important factor for safety monitoring. With that pointed out it should be obvious it would be best to have the control loop feedback sensor measuring actual throttle position rather than a motor sensor that has a more vague relationship to TP via a linkage that is usually non-linear, has backlash, and can fall-off/break/bend/wear etc.

For good DBW ITB control it is important that the entire linkage system has very minimal backlash, it should be designed so when the throttle blades are closed the minimum motor position is somewhere above its original "unpowered sprung return position" with a positive stop to prevent overloading the linkage when closing, and the throttle shaft(s) require a light return spring system to keep backlash taken up and to ensure the throttles close naturally if the linkage fails or disconnects.

I've got a single BMW throttle motor. I'm going to use it to control two sets of throttles (porsche 911). Each set of throttles has a single TPS on the end of the main shaft.

Can I use these as my two TPS sensors? I thought that the TPS sensors needed to be arranged so that when one went high, the other went low.

Thanks

Dave

That requirement depends on the ECU in use.

My experience is that this sort of setup causes a lot of issues with control as the sensors do not correctly track with each other.

That's what I read too. Two independent sensors will be difficult to synch up.

Thanks!!

Dave

I bought this:

https://www.digikey.com/en/products/detail/variohm/EURO-XPD-2832-812-214-911-00/22286984?so=90135047&content=productdetail_US

I plan to put it on one of the ITB bodies.

BTW, I sent a message to Haltech support over a week ago about using this throttle motor and never got a response.