Re: Electronic Stability Control In Indian Cars? Quote:
Originally Posted by ron178 ..I don't understand how a yaw rate sensor would help detect inclination.. | Quote:
Originally Posted by fiat_tarun ..The yaw sensor will detect the plane on all 3 axis' - X, Y & Z and hence is the sensor used for Hill Assist as well...! |
I agree with ron. If we are keeping the argument purely technical, then ESP and Hill-hold work on different sensor inputs at the fundamental level.
Excluding the steering angle sensor out of the discussion, basic ESP works based on the yaw rate sensor, which is a gyroscope. It measures angular velocity around its vertical axis (X,Y plane) i.e. rotation of the car around a vertical axis including our Ecosport Tarun. Advanced ESP systems also provide Roll Stabilty which have an additional gyroscope (Roll rate sensor) to detect rotation of a car around the horizontal axis (Y,Z plane). (Ecosport S in India doesn't get Roll sensor hence no RSC, while global models have it in addition to ESP)
Hill Hold function works by measuring tilt angle using accelerometers. Most, if not all, car manufacturers package all vehicle dynamics sensors in a single module/assembly/PCB for ease and its easy to confuse one with another or assume that one wouldn't work without the other sensor. Quote:
Originally Posted by GeneralJazz Strictly speaking, Hill Hold is possible without ESP.... | Quote:
Originally Posted by fiat_tarun ..Just take a look at any of the Maruti AMT's with only ABS & Hill Hold and you will see that the hydraulic unit is actually an ESP... |
Basic Hill-hold (where car holds for 2-3 secs after you lift off the brake pedal) should be possible on a basic ABS car just like in some bikes in theory. Why it is not offered is anyone's guess. I assume could be due to safety reasons such as in case of valve failure or brake pressure relief somewhere accidentally, the car will just roll. This can be negated atleast for a certain time or extent on ESP cars as the High-pressure pump in the ESP/ABS assembly can apply excess pressure as needed without the driver having to manually apply brake.
I have no experience with Maruti but it seems illogical that Maruti is using HCU from a ESP system but haven't enabled ESP on Brezza. It wouldn't take long or lot of money for a vehicle dynamics engineer to calibrate the car for ESP. Going by Tarun's information Maruti should have offered ESP. It would have been a huge selling point. Quote:
Originally Posted by fiat_tarun ..an optional integrated yaw rate sensor (most cases nowadays) and of course the relevant ECU. |
AFAIK most yaw rate sensors (i.e. sensor assembly) are not integrated and are located at the center of the dash or console preferably near vehicle's center of gravity. In case of ES, sensors are part of the Restraints Control Module (RCM), under the hand brake assembly, that controls the airbags and seat belts restraints.
Last edited by nightraven : 24th March 2022 at 17:08.
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