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Thread: Some advice?

  1. #1

    Some advice?

    I'm looking for some advice. I've had my Mercedes Sprinter van for just over seven years now. It is fitted with Paravan Space Drive technology. Ever since I started driving the vehicle I found the accelerator and braking to be rather sensitive, however I've got used to it now. After looking at various videos of people using a similar system to mind, I've realised that everyone else's is set up in a different way to mind. I'm now thinking that the controls may be rather sensitive due to the way that it's been designed. I have included a small video to show you how mind works. You will see that I have a sliding armrest which runs along a linear slide. There is a long bar connected at the rear of the armrest which then runs forward and attaches to the brake/accelerator lever. I think this could be the problem, controlling a small lever with a long bar is going to make it very sensitive, it would be rather like attaching a great big long joystick to your wheelchair and then trying to drive the wheelchair smoothly. I'm deciding whether to get them to redesign my accelerator/break so that I have a Tetra grip attached directly to the brake accelerator lever, with an armrest for support. I think that having my hand attached directly to the lever will probably give you better control as it will be much less sensitive.
    https://www.youtube.com/watch?v=32esNdWWdbI

  2. #2
    I think you mean that you want to grab that silver flat vertical bar the comes out of the box below the armrest. Continuing on what I think you are saying is that you want to use it like linear joystick. I think if you can do that, it's a good idea as it gets rid of those mechanical joints.

    Another idea would be to lengthen (not shortening) that lever and leave everything in place. That should give a smoother action, but it also might limit the available throw distance.


    edited for clarity
    Last edited by nonoise; 01-30-2015 at 12:23 AM.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

  3. #3
    Quote Originally Posted by nonoise View Post
    I think you mean that you want to grab that silver flat vertical bar the comes out of the box below the armrest. Continuing on what I think you are saying is that you want to use it like linear joystick. I think if you can do that, it's a good idea as it gets rid of those mechanical joints.

    Another idea would be to lengthen (not shortening) that lever and leave everything in place. That should give a smoother action, but it also might limit the available throw distance.


    edited for clarity
    Until a test I will not know for sure. However, the way I understand things is that if you try and control something that doesn't have a particularly big movement and is quite sure, like the lever, or the joystick on a wheelchair using a much longer adaption venue or just trying things difficult as it will just be too sensitive. That's why joystick from wheelchairs are fairly short, I think if you had a joystick 10 inches long it would be a little more difficult to control wheelchair.

  4. #4
    Senior Member
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    If I understand the video and your comment, it should be a longer joystick should give you a "smoother" control. However, the overall range of movement would be reduced. Exact opposite would small with shorter stick.

  5. #5
    i am not familiar with the Paravan system. It looks similar to my Aevit system. My system uses mechanical shims to adj sensitivity on the gas and brake. The newer system has computer controlled adjustments for sensitivity and such. You may want to consult with a good shop adjustments available.

  6. #6
    Can you do a video of how you use it when you drive?

    Feel free to send this directly to me.

    Do you have full or any finger motion?

    Have the guys that built your van installed a lot of these systems?

    Jim
    Jim, MA, MMET
    Bridgewater, MA

  7. #7
    Quote Originally Posted by Automotive Innovations View Post
    Can you do a video of how you use it when you drive?

    Feel free to send this directly to me.

    Do you have full or any finger motion?

    Have the guys that built your van installed a lot of these systems?

    Jim
    I could probably make a video showing me in the van showing how I drive, but at the moment I can't really drive the van because the brakes are far too fierce. I'm not sure what's happened, I nearly got myself through the windscreen the other day when I took it out for a test drive. The guys who adapted the vehicle for me told me that they haven't touched the breaking when they checked the controls the other day. I should add, that I had a bit of a mishap back in September, the vehicle has been away getting fixed. Someone suggested that the brake discs may have got a little rusty whilst the van has been sitting out side.

    I should also add that I could drive perfectly okay before, it's just that I've always found this setup a little bit sensitive. Put it this way, I doubt very much whether a new driver to get in my van and drive it straightaway, I think They would probably find it just a little bit too sensitive. This is why I'm looking to have things altered. I've included a video of my mate driving his Chrysler Voyager. He's using exactly the same joystick and accelerator/brake as I have got. However, you will see that his special tetra hand grip Is attached directly to the accelerator/brake lever. My adaptions on the other hand have been designed in a completely different way. They actually used part of my old vehicle which used a different type of mechanism for the brake and accelerator. You can see on the video I posted with my original message that the Moving part that my arms sits in is attached to the lever with a long bar. Yes, it makes it very sensitive, but you don't really want it to be too sensitive because You want to be able to accelerate without taking off at 100 miles an hour. This is why I think having your hand almost directly attached to the lever makes it easier to control the brake and accelerator and stops you overcompensating.

    https://www.youtube.com/watch?v=RGtLwhHaM3U
    Last edited by Ironside; 01-30-2015 at 04:55 PM.

  8. #8
    Get your brakes inspected and repaired if necessary by someone qualified to do so before starting on deciding what revisions you want to make to your setup.
    About the lever length thing, think about a teeter totter. It is easier to control one from the seat than it is near the fulcrum. But I doubt lever length is your issue, something else has likely been wrong from the start like was suggested.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

  9. #9
    I thought I would give you guys a quick update on what has been going on since I started this thread. The brakes were perfectly okay, my dad took the vehicle out, it was okay. So my van has now gone up to the specialists and I'm having the accelerator/brake completely redesigned. Rather than having a linear armrests slide, I'm having a tetra grip connected straight to believe on the accelerator and brake, with a static armrest so that I can keep myself steady. I've also decided to move my secondary controls from where they were. I used to operate them using my elbow, but they were ever going off to fight turned right, or if I put on extra clothing. I decided to go for a head control unit so that I can just use my head, it will make it a lot easier. And I also decided to bite the bullet and go for an electric start for my van, rather than struggling with the key. So all I will have to do now is press a button to start the engine. When I get the vehicle back I'll let you know how things go.

  10. #10
    Ironside
    Did you get that sorted?
    I’ve done my first drive test on my new car adapted with Paravan 4 way joystick. And the same the breaking and acceleration were very too sensitive nearly impossible for me to drive

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