[Shop-talk] Power lift hatches

[Eric Russell]

https://youtu.be/znnJrlpku-U


On Thu, Aug 12, 2021 at 4:57 PM Jeff Scarbrough <fishplate at gmail.com> wrote:

> I've been thinking about this and looking at the struts on our Subaru.
> Some important things:  you can move it independently of the motor
> operation, but it will try to move by motor if you do that; it can be set
> to a "preferred" height based on key used or seat settings, and.only one
> strut has a wire.
>
> I'm guessing it's an actuator that uses some sort of drive wheel on the
> rod, and a stepper motor of some sort to drive it.
>
> Possibly it has lost its zero point?  It might be educational to
> disconnect the hatch end and operate it unloaded.  See if it stutters then,
> and verify the hinges themselves don't have a problem.
>
> On Thu, Aug 12, 2021, 16:35 <jblair1948 at cox.net> wrote:
>
>> Hi Gang,
>>
>> Got a different question this time, not compressors. My neighbor has a
>> 2018 Ford Escape with the power lift hatch. A couple of weeks ago she went
>> someplace and had the load something in the back of her car. She told them,
>> "Don't close the hatch, I will close it from in here!" Well guess what,
>> they tried to close the hatch. After that her hatch has had all kind of
>> problems, not opening correctly/completely, not closing correctly, etc. She
>> tried to pull the fuse to "reset" the controller for the power hatch.
>>
>> I'm spent a lot of time doing internet searches for "how do they work",
>> "troubleshooting power lift hatches", etc. to no avail.
>>
>> I'm wondering if anyone know what type technology they use for all these
>> power lift hatches?
>>
>> I only way I can think of them working is with a linear actuactor. And I
>> did find an excellent video on linear actuactors and controlling them. But
>> a linear actuactor is basically a long screw and a nut. As the screw turns
>> the nut moves either up or down.
>>
>> If they are using a linear actuactor that can't be manually over riden.
>> And I'd assume that it would bend
>> either the hinges on the hatch or the actual hatch itself. And I can't
>> believe that a manufacturer would build something like that into a car.
>> Every one is used to pulling down on a hatch or a trunk. So it seems to me
>> that having someone helping you load your car with anything is likely to
>> try and manually close your hatch/trunk.
>>
>> So anyone know if these things are really linear actuactors or what they
>> are? Untill my neighbor desides to replace hers, I don't have one to cut
>> open and look inside. :)
>>
>> TIA,
>>
>> John
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-- 
Eric Russell
Mebane, NC
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