ba-autox
[Top] [All Lists]

Re: Braking performance and ABS

To: "Jeffrey Macko" <jeffrey@macko.net>
Subject: Re: Braking performance and ABS
From: Kevin Stevens <Kevin_Stevens@pursued-with.net>
Date: Mon, 24 Mar 2003 20:25:59 -0800
On Monday, Mar 24, 2003, at 17:25 US/Pacific, Jeffrey Macko wrote:

> ----- Original Message -----
> From: "Kevin Stevens" <Kevin_Stevens@pursued-with.net>
>
>> A similar effect is of value in the dry.  If you are threshold braking
>> while the car is undergoing ANY lateral acceleration; you have two 
>> choices
>> - you can brake to the traction limit of the outside wheel, which will
>> cause the inside wheel to lock/enter ABS, or you can brake to the 
>> traction
>> limit of the inside wheel, which will cause the car to slow down less
>> rapidly. *  Without ABS, most people choose option B, because 
>> flatspotting
>> tires gets expensive, and because locking the inside wheel upsets the 
>> car
>> even on dry pavement.  With ABS, most people choose option A, braking 
>> to
>> the threshold of the outside wheel and allowing ABS to handle the 
>> minor
>> locking on the inside.  However, some ABS systems are crude enough 
>> that
>> even this amount of locking is counterproductive.
>
> Don't most modern ABS systems control each wheel as a separate ABS 
> system?

All I'm familiar with treat each front wheel as a separate channel.  
Some treat both rear wheels as one.

> Newer BMW's have stablity control where they can modulate braking on 
> each
> wheel independantly.   Wouldn't this system carry over so that the 
> above
> isn't an issue.  Anyone know?

Please clarify your question.  "The above" addresses a number of 
different points.

KeS

<Prev in Thread] Current Thread [Next in Thread>