Tosh wrote:Hitting the brakes or accelerator will have no effect to the stability as the ESP will take over and maintain the car on the steering course you want.
Tosh wrote:Using conventional skid control techniques of reducing steering angle in an understeer slide or opposite lock to correct a rear wheel slide will actually prevent the ESP from activating as it will not detect a slide.
125isfine. wrote: I had a latest model Kia Picanto with ESP and that didn't work at all!. It would allow horrendous wheelspin on pullaway, it did not shut power off or apply brakes and I could get straight on terminal under steer on full lock in the snow, all I could see was a flashing orange light. Dealers said nothing wrong.
WS wrote:Hi All,
I would like to ask about your opinion on the best technique for dealing with skids in a car equipped with the ESP. Basically, the question I would like to ask is, should the driver try to help the system or should they not do anything and just let the ESP do the job?
StressedDave wrote:...there's a whole lot of nasty maths revolving around the need for a decent amount of forward speed for the enhanced kalman filter to be able to work out the other important control parameters...
martine wrote:StressedDave wrote:...there's a whole lot of nasty maths revolving around the need for a decent amount of forward speed for the enhanced kalman filter to be able to work out the other important control parameters...
I blame the reversed polarity of the warp engines myself...
StressedDave wrote:waremark wrote:125isfine. wrote: I had a latest model Kia Picanto with ESP and that didn't work at all!. It would allow horrendous wheelspin on pullaway, it did not shut power off or apply brakes and I could get straight on terminal under steer on full lock in the snow, all I could see was a flashing orange light. Dealers said nothing wrong.
ESP needs a reasonable level of grip to function. Pulsing the brakes cannot help unless the tyres have some purchase. Possibly in this case there was not enough.
ESP doesn't generally include traction control per se. It can tell the engine management to shut power off if that will be better to maintain stability but doesn't control wheelspin. It's also worth remembering that the system has limited command authority. It can't change the laws of physics, hence terminal understeer if there's insufficient grip. It also tends to have a speed cutoff (5-10 mph on the earlier systems, god knows what these days) so at slow speed it can't work in any case (there's a whole lot of nasty maths revolving around the need for a decent amount of forward speed for the enhanced kalman filter to be able to work out the other important control parameters - there aren't enough sensors in the system to measure all that needs to be measured so it estimates).
triquet wrote:Indeed. I think that as the coefficient of friction approaches zero all the bets are off and the most sophisticated of algorithms are not going to help.
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