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625kinc
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re: Toyota Braking Problem Investigation
625kinc   7/19/2010 4:31:13 PM
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Many of our non-technical users reported the loss of braking force as 'a surge' or 'acceleration.' All it took was focusing on how to replicate this intermittent problem and then measuring it. Happily, at the same time Toyota released a software patch to the ABS brake system that solved the single-impulse problem. Bob Wilson

625kinc
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re: Toyota Braking Problem Investigation
625kinc   7/19/2010 4:02:42 PM
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There have been two reports of "washboard" roads causing a loss of brake effectiveness. But both were from Northern latitudes where frozen ground seems to cause this condition. In the South, I'm looking for road work where they have cut diagonal strips in the road surface and I can drive on it without road work crews in the area. Bob Wilson

wrhewitt
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re: Toyota Braking Problem Investigation
wrhewitt   7/19/2010 3:27:13 PM
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I own a Pontiac Vibe (Toyota Matrix) and had the antilock braking activate once when going over a pot hole and starting to apply the breaks. It felt like loss of breaking but I recognized it very quickly. This was on dry road. Not sure if antilock is applicable to the Prius.

regman
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re: Toyota Braking Problem Investigation
regman   7/19/2010 1:04:03 PM
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Could you provide some details on what "scattered reports of another braking anomaly" are? I would like to look for this in my Prius since I have had the pot hole issues prior to my recall fix.

DrQuine
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re: Toyota Braking Problem Investigation
DrQuine   6/22/2010 10:47:10 PM
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An elegant analysis that gets to the bottom of the problem. Potholes certainly present an interesting (and growing) issue because there can be momentary loss of traction due to the lack of substrate as well as the complex interactions with the vehicle suspension. This all results in puzzling traction data being provided to the braking control systems. Your excellent reputation in the hybrid car community is well deserved!

p51
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re: Toyota Braking Problem Investigation
p51   6/18/2010 7:56:03 AM
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I agree!

ryan.medlin
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re: Toyota Braking Problem Investigation
ryan.medlin   6/17/2010 9:58:23 PM
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yes it is!!



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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