Search This Blog

Tuesday, August 2, 2011

Steering a Car and Volvo Recall

Have you heard of  Ackermann  and the geometry associated with him !!

Driving a car looks pretty easy and simple – in cinemas you would have seen that in a chase, the hero would be turning the steering wheel, his head and everything else, biting his teeth, making it appear that he is under considerable stress and strain in accelerating the vehicle faster……… 

Without going into the details of the mechanics,  the first thing that strikes the eye is the steering wheel.  The two wheeler appears to have a much simpler pattern.  It has the handle bar, which is to be held firm and movement left or right would enable the movement of the vehicle in that direction.  Steering is the similar mechanism in a car of any 4 wheeler for that matter.  It is infact a term applied to  the collection of components, linkages, etc. which will allow a vessel (ship, boat) or vehicle (car, motorcycle, bicycle) to follow the desired course. Rail transport perhaps follows a different mechanism altogether.

photo from How stuff works....
As we see, the most  conventional steering arrangement is to turn the front wheels using a hand–operated steering wheel which is positioned in front of the driver.  Again to understand how this works – you need to know something of the complex mechanism which constitutes steering column, universal joints and more which allows the vehicle to deviate from its straight path into the desired way.  To put it simply, you turn the car by rotating the steering wheel.  Unlike handle bar where the turn of the handle is directly proportionate to the angle of the wheel, things are lot different here. 

There are many types and commonest of them are the rack & pinion and recirculating ball steering.  For turning the vehicle, the wheels have to turn and for that you need to rotate vigorously the steering wheel [infact the mechanism works the other way – steering wheel – wheel – vehicle].  The first fact that would hit you hard is that when you turn your car, your front wheels are not pointing in the same direction.  Each wheel would follow a different circle.  If you are turning say left, the left hand side wheel is following a smaller radius and actually makes a tighter turn than the right wheel, which follows a relatively longer radius.  The geometry of the steering linkage makes the inside wheel turn more than the outside wheel.

For the ease of turning, EPS [electrically powered steering] or simply power steering is the contraption that uses an electric motor to drive either the power steering hydraulic pump or the steering linkage directly. The power steering function therefore does not enforce any strain on the engine, results in energy saving and is relatively easy to make a turn.   Power steering enables the driver to steer by directing  some of its power to assist in swiveling. There are two types of power steering systems; hydraulic and electric /electronic. A hydraulic power steering (HPS) uses hydraulic pressure supplied by an engine-driven pump to assist the motion of turning the steering wheel. Electric power steering (EPS) is more efficient than the hydraulic power steering, since the electric power steering motor only needs to provide assistance when the steering wheel is turned, whereas the hydraulic pump must run constantly.  A higher % of power steering systems are hydraulic, where it is powered by high pressure hydraulic fluid.

Volvo is a famous brand.  Volvo means ‘I roll’ in Latin.  The auto manufacturer was founded in 1927 and the first car rolled out of the factory in Gothenburg.   Zhejiang Geely Holding Group is a holding company and parent of Geely Automobile Holdings Ltd.  The Volvo is presently owned by  China’s Geely.

It is reported that Volvo is recalling 8,406.  S80 cars for a potential power steering fluid problem that could increase the risk of a crash.  It is reported that the recall pertains to 2007 model cars built between March 8, 2006, and May 16, 2007,  and that Volvo wishes to inspect a potential problem that could lead to a burst hose at the steering gear that would cause a sudden loss of power steering.  Volvo dealers will inspect the cars and make repairs as needed at no charge and the recall is expected to begin during August.

Ackermann steering geometry is a geometric arrangement of linkages in the steering of a car or other vehicle designed to solve the problem of wheels on the inside and outside of a turn needing to trace out circles of different radii. It was invented by the German Carriage Builder Georg Lankensperger in Munich in 1817, then patented by his agent in England, Rudolph Ackermann in 1818 for horse drawn carriages.  Modern cars do not use pure Ackermann steering, partly because it ignores important dynamic and compliant effects, but the principle is sound for low speed manoeuvres.

Regards – S. Sampathkumar.


  1. Good post. I learn something new and challenging on sites I stumbleupon everyday.
    It's always exciting to read articles from other writers and practice something from their web sites.
    My blog klicken hier

  2. Terrific post but I was wondering if you could write a
    litte more on this subject? I'd be very grateful if you could elaborate a little bit further. Cheers!
    Visit my web page - hier klicken

  3. After exploring a handful of the blog posts on your web site, I honestly appreciate your way of blogging.

    I added it to my bookmark website list and will be checking back soon.
    Take a look at my website as well and tell me your opinion.
    My page - suchmaschinen

  4. Do you have a spam issue on this blog; I also am a blogger, and I was curious about your situation; we have created some nice procedures and we are looking to trade strategies with other folks,
    please shoot me an e-mail if interested.
    Feel free to surf my site progressive slot

  5. Pretty! This was an incredibly wonderful post. Many thanks for providing this information.
    My page: money

  6. Great post. I used to be checking continuously this weblog and I'm impressed! Very useful info specifically the last part :) I handle such info much. I was looking for this particular information for a very lengthy time. Thank you and best of luck.

    Also visit my web-site ... Tumblr

  7. This is a very good tip especially to those fresh to the blogosphere.
    Brief but very accurate info… Many thanks for sharing this one.

    A must read article!

    my site book of ra download chip online

  8. I don't know whether it's just me or if perhaps everyone else
    encountering issues with your site. It appears as though some of
    the text within your content are running off the screen.
    Can someone else please provide feedback and let me know if this is happening to them as
    well? This could be a issue with my browser because I've had this happen previously. Many thanks

    Stop by my webpage - book of ra apk downloaden

  9. It's a shame you don't have a donate button!
    I'd definitely donate to this brilliant blog! I guess for now i'll settle for book-marking
    and adding your RSS feed to my Google account. I look forward to brand new updates and will share this
    site with my Facebook group. Talk soon!

    My web site ... book of rah

  10. Excellent beat ! I would like to apprentice while you amend your
    web site, how could i subscribe for a blog site? The account
    aided me a acceptable deal. I had been a little bit acquainted of this your broadcast offered bright
    clear concept

    My site; book of ra Apps

  11. Hello, I enjoy reading all of your post. I wanted to write a little comment
    to support you.

    My homepage :: paper plates

  12. Very great post. I simply stumbled upon your
    weblog and wished to mention that I have truly loved surfing around your blog posts.
    In any case I will be subscribing for your rss feed and I'm hoping you write again very soon!

    My webpage: book of ra tricks cheats

  13. My brother recommended I might like this web site.
    He was entirely right. This post truly made my day. You cann't imagine just how much time I had spent for this information! Thanks!

    Feel free to visit my blog post;

  14. My brother suggested I might like this blog. He was once totally right.
    This put up actually made my day. You can not imagine just how much
    time I had spent for this info! Thanks!

    Feel free to visit my web site quasar gaming casino

  15. I have been browsing online greater than 3 hours lately, yet I by
    no means found any interesting article like yours. It is beautiful price enough for
    me. Personally, if all website owners and bloggers made good content as you
    did, the web shall be much more useful than ever before.

    My homepage; printable grocery coupons

  16. I blog frequently and I truly thank you for your content.
    The article has truly peaked my interest. I'm going to book mark your website and keep checking for new information about once a week. I opted in for your Feed too.

    Feel free to visit my website :: printable all coupon

  17. Sweet blog! I found it while surfing around on Yahoo News.
    Do you have any suggestions on how to get listed in Yahoo News?
    I've been trying for a while but I never seem to get there! Many thanks

    Here is my web-site; american poker novoline online spielen kostenlos

  18. Hi Dear, are you actually visiting this website regularly, if so afterward you will absolutely obtain fastidious know-how.

    Here is my blog - novoline spiele kostenlos online spielen ohne anmeldung

  19. Thanks , I have just been looking for info about this subject for ages and yours is the
    best I've came upon till now. However, what about the bottom line? Are you sure concerning the source?

    Feel free to visit my weblog ... bookofrakostenlos

  20. Why users still make use of to read news papers when in this technological
    globe all is existing on web?

    Also visit my site German Sweet Chocolate

  21. You made some decent points there. I checked on the net for additional information about the issue
    and found most people will go along with your views on this web site.

    Have a look at my web site: chocolate cake recipe

  22. Hi it's me, I am also visiting this web page on a regular basis, this web site is really nice and the viewers are in fact sharing nice thoughts.

    My site; extreme coupons

  23. Excellent post. I used to be checking continuously this blog and I'm impressed! Very helpful info specifically the closing phase :) I deal with such information a lot. I was looking for this particular info for a very long time. Thank you and best of luck.

    Here is my web site ... products of photosynthesis ()

  24. I've been exploring for a bit for any high quality articles or blog posts on this kind of space . Exploring in Yahoo I finally stumbled upon this web site. Studying this info So i am glad to express that I've an incredibly
    good uncanny feeling I came upon just what I needed. I so much unquestionably will make
    certain to do not overlook this site and provides it a glance regularly.

    my blog post: download tide coupons

  25. Greetings from Carolina! I'm bored at work so I decided to check out your site on my iphone during lunch break. I really like the information you provide here and can't wait
    to take a look when I get home. I'm amazed at how fast your blog loaded on my phone .. I'm not even using WIFI,
    just 3G .. Anyhow, fantastic site!

    Look into my website ... tide detergent

  26. Hmm is anyone else encountering problems with the images
    on this blog loading? I'm trying to figure out if its a problem on my end or if it's the blog.
    Any responses would be greatly appreciated.

    my web page; laundry detergent coupons

  27. Thank you, I have just been looking for information approximately this subject for a long time and yours is the best I have
    discovered till now. But, what in regards to the conclusion?
    Are you sure about the supply?

    Feel free to surf to my homepage - tom tom home download

  28. Thank you for any other informative blog. Where else may just I
    get that kind of info written in such a perfect manner? I
    have a venture that I'm just now working on, and I've
    been on the look out for such info.

    Feel free to visit my page book of raa kostenlos

  29. For newest information you have to pay a visit internet and on internet I found this website as a most
    excellent web site for newest updates.

    My blog; reusable products ()

  30. Hi just wanted to give you a brief heads up and let you know a
    few of the images aren't loading properly. I'm not
    sure why but I think its a linking issue. I've tried it in two different browsers and both show the same outcome.

    My blog - shower favors bridal - -

  31. Hi there to all, how is everything, I think every one is getting more from this web page, and your views are
    good in favor of new viewers.

    Here is my page - guns america magazine

  32. Superb blog you have here but I was curious about if you knew
    of any user discussion forums that cover the same topics discussed here?
    I'd really like to be a part of community where I can get
    opinions from other knowledgeable people that share the same interest.

    If you have any suggestions, please let me know. Thanks a lot!

    Also visit my web-site - salary career

  33. Hello friends, fastidious paragraph and fastidious urging
    commented at this place, I am in fact enjoying by these.

    my web page ... dental in ahmedabad

  34. Hi are using Wordpress for your site platform?
    I'm new to the blog world but I'm trying to get started and create my
    own. Do you require any html coding knowledge to make your own blog?

    Any help would be greatly appreciated!

    my homepage ... eastland shoes sneakers

  35. Its like you read my thoughts! You seem to know so much approximately this, such as you wrote
    the ebook in it or something. I think that you simply could do with a few percent to pressure
    the message home a bit, however other than that, that is
    excellent blog. An excellent read. I'll certainly be back.

    Feel free to visit my site :: concealed weapons permit

  36. I'm not sure exactly why but this blog is loading extremely slow for me.
    Is anyone else having this issue or is it a problem on my end?
    I'll check back later on and see if the problem still exists.

    my page - novoline spiele gratis

  37. Hello there, I do believe your web site could possibly be having browser
    compatibility problems. When I look at your web site in Safari,
    it looks fine however when opening in Internet
    Explorer, it's got some overlapping issues. I simply wanted to provide you
    with a quick heads up! Apart from that, fantastic site!

    my web-site :: solid gold watch ()

  38. Hey there! I'm at work browsing your blog from my new apple iphone!

    Just wanted to say I love reading through your blog and look forward to all your posts!
    Carry on the excellent work!

    my web blog ... toys *

  39. Wow, that's what I was searching for, what a stuff! present here at this
    blog, thanks admin of this web site.

    Also visit my web-site :: cardiovascular technology education

  40. This comment has been removed by a blog administrator.