Talk:Threshold braking

Gear-headed description

I added a sentence at the end for clarity but I believe this should be rewritten a bit. It is written almost as a terse technical definition for a scientific audience that mostly already understands what this is talking about. Ideally the article should be written more from the perspective of an average reader and not require that they have to follow the links before they can grasp what it is talking about. I realize that this was probably created as a link from another page but it should still kind of stand on it's own. --Mcorazao 19:58, 31 December 2006 (UTC)[reply]

I have tried to re-write some of the article to appeal to a wider audience, reduce the engineering style of language used and simplify the material. Driver sam (talk) 14:26, 26 May 2008 (UTC)[reply]

WHERE IS THE ACTUAL TECHNIQUE OF THRESHOLD BRAKING ON THE PAGE?

122.164.136.8 09:20, 17 April 2007 (UTC)Nishanth[reply]

Yes, there should be the threshhold technique included. Besides, I don't really think there's such a techqnique as "threshhold braking". During cadence braking and ABS braking there are split seconds when the car is kept on the threshhols. However, real threshhold braking is impossible. It would be similar to putting a needle on its end in vertical position.

However, there are drivers who try to brake on the limit without locking the wheels. The problem is that before you lock the wheel, you don'y really know how much traction there is available. That's why many drivers sharply lock the wheels in the first stage of braking to see how much grip they have. Then they unlock the wheels and try to brake on the limit. —Preceding unsigned comment added by 79.185.174.49 (talk) 07:55, 2 June 2008 (UTC)[reply]

Clarification needed

In the present article:

The optimal [presumably maximum] amount of braking force is developed at the point when the wheel just begins to slip. [sounds like it means maximum brake pedal pressure consistent with zero wheel slip]
Braking beyond the slipping point causes the tire to slide and the friction adhesion between the tire and driving surface is reduced. [sounds like braking with any amount of slip is less effective than with zero slip, consistent with the first statement]
Peak friction occurs between the static and dynamic endpoints, and this is the point that threshold braking tries to maintain. [unclear what "endpoints" means exactly, but sounds like the optimum has non-zero slip: not consistent with the apparent meaning of the first two statements]

Meanwhile the graph at [1] looks consistent with (an interpretation of) statement 3 and inconsistent with (interpretations of) statements 1 & 2, although we had better assume the y axis on this graph does not begin at zero, otherwise it is saying you cannot brake at all without slip! — Preceding unsigned comment added by 82.10.109.67 (talk) 17:03, 17 April 2012 (UTC)[reply]

Who writes drivingfast.net? The site looks like a content aggregator that patches together information from unnamed sources, possibly pirated, to drive page views and advertising impressions. The statement "As long as you are heading in the right direction locked wheels will slow you down effectively" is rather wishful thinking. Lack of directional control is, shall we say, a non-trivial problem. And that's only in a car; on a motorcycle a locked wheel moving out of line is even more problematic. --Dennis Bratland (talk) 17:15, 17 April 2012 (UTC)[reply]

I think you cannot break with zero slip. The maximum friction seems to be achieved at "fairly low" slip amounts, but the models seem to predict no braking when the slip is zero.^[1]^[2] One article states that for cars on roads the optimum braking deceleration is reached at a brake slip between 8 and 25%.^[3] I would like to rectify the article in this regard and would appreciate it if someone that already understood the subject would review or discuss the changes with me. Please ping me when replying. BernardoSulzbach (talk) 18:38, 22 December 2021 (UTC)[reply]

References

^ Tsiotras, P.; De Wit, C.C. (2000). On the optimal braking of wheeled vehicles. IEEE. doi:10.1109/acc.2000.878964.
^ Mirzaeinejad, Hossein; Mirzaei, Mehdi (2010). "A novel method for non-linear control of wheel slip in anti-lock braking systems". Control Engineering Practice. 18 (8). Elsevier BV: 918–926. doi:10.1016/j.conengprac.2010.03.015. ISSN 0967-0661.
^ "Anti-lock brake system (ABS)". Mein Autolexikon. Retrieved 2021-12-22.

AKA

This is also known as "predictive braking". Yevad (talk) 09:03, 2 October 2014 (UTC)[reply]

[Tsiotras_De_Wit_2000_p.-1] Tsiotras, P.; De Wit, C.C. (2000). On the optimal braking of wheeled vehicles. IEEE. doi:10.1109/acc.2000.878964.

[Mirzaeinejad_Mirzaei_2010_pp._918–926-2] Mirzaeinejad, Hossein; Mirzaei, Mehdi (2010). "A novel method for non-linear control of wheel slip in anti-lock braking systems". Control Engineering Practice. 18 (8). Elsevier BV: 918–926. doi:10.1016/j.conengprac.2010.03.015. ISSN 0967-0661.

[Mein_Autolexikon-3] "Anti-lock brake system (ABS)". Mein Autolexikon. Retrieved 2021-12-22.

[1]

[2]

[3]