I kind of regret not speccing my car with ESP, it was just a

AIUI ESP includes traction control, and low pressure powered brakes, so there's rather more to it than just steering angle sensors.

You sure it's not just the ABS helping you get round the corner?

Chris

Well yes, if you're braking and have "proper ABS", which has somehow become "ABS + Brake Force Distribution", then the ABS helps you a bit with getting round a corner when you brake.

ESP is suppposed to be able to actively brake a wheel or more, rather than just cut power, so it must get hydraulic pressure to apply to the wheel cylinder(s) from somewhere. If you're not actively braking, then that somewhere surely must be a separate hydraulic pump.

Yeah sorry Ken, I wasn't very clear. What I was trying to say was that what he was seeing was just ABS + EBD, which is a bit different to ESP with the ability to brake individual wheels based on the car's yaw, steering angle, etc, etc

Chris

Right agreed then. Still and all, my point was that there's more to ESP than just a couple of extra sensors and some code, which has more to do with the OP's query.

It also highlights my concern with these electronnicy systems; that people will rely on them without realising that they are doing so.

I don't think Hyundai know what ESP is do they? (obviously a joke)

ABS helps you steer while braking and makes the front wheels not lock up therefore you are able to brake

EBD when under hard braking if ones wheel locks up it will make sure the car carries straight on instead on swerving. braking one wheel and not the other at the same time will cause a car to swerve.

ESP when going round a corner and your start slipping off from your trajectory in correlation to wheel angles and steerring wheel direction then it will brake the combination of wheels enabling you follow the path you are wanting to go i.e where the wheel and steering wheels are facing before you started slipping.

ESP monitors a load of sensors including a YAW sensor every 1/1000 of a second to make sure you are not skidding off course.

Which is great, except that it's wrong - proof by practical example.

My last car had 4-channel ABS, and good steering feel, but did not have EBD. If you braked hard in a straight line, then put 1 side onto a low grip split-mu surface, you could feel the retardation fall off as the ABS cut in on that side, but the car kept going straight and the steering didn't pull to the low mu side as claimed.

I dont understand what your point is...could you make it clearer?

AIUI you're saying that without EBD you can get a pull from the steering when ABS cuts in because the wheels on one side are on a slippery surface. I'm saying that I know that that is not the case because it just plain doesn't happen.

O I C must have got it mixed up with smething else then

Electronic brakeforce distribution (EBD) is an automobile brake technology that automatically varies the amount of force applied to each of a vehicle's brakes, based on road conditions, speed, loading, etc. Often coupled with anti-lock braking systems, EBD can apply more or less braking pressure to each wheel in order to maximize stopping power.

In a hydraulic brake system not equipped with EBD, there is a fixed front-to-rear brake force bias which is determined by the hydraulic components (for example, caliper piston diameter). This bias may be shifted under heavy braking, by means of a mechanical proportioning valve, to prevent rear-wheel lockup. EBD instead applies brake force precisely through electronic control. It recognises that driving conditions, braking situations and vehicle weight distributions are unique and constantly changing. Working together with Anti-lock Braking System (ABS), EBD uses sensors to determine which wheels would provide maximum braking for the conditions – whether that's the front or rear wheels, the left or right. The final result is more precise and effective braking under all conditions.

Retrieved from "http://en.wikipedia.org/wiki/Electronic_brakeforce_distribution"

The thing that I don't see is how EBD can actually increase force over that which you actually apply to the pedal without using an additional hydraulic pump or a "pedal grabber".

Accepting that, surely it still has to second-guess what you actually intended to do in order to be able to increase braking force?

it is very clever stuff. I can imagine lots of electronic gizmos and sensors and electronic pumps etc