Quote:
Originally Posted by superutp A noob'ish question, when a car has ABS does it automatically mean it has EBD? As in, is EBD a function of the ABS? Take for example the Chevrolet Beat, the top model has ABS but has no mention of EBD. Does ABS without EBD even make sense? And how would you know if its 2,3 or 4 channel? |
Well it is after all a hydraulic circuit. So you can combine or leave out whatever you want. And cost cutting goes on in many ways- some of them plain stupid.
I remember an incident narrated to me, almost a decade ago, by the senior Q.C. person in charge of UV's at a Pune manufacturer. (you can guess the names of the companies

). They were being trounced in sales by a south based Jap company. One of the reasons was that the Jap vehicle was much better in emergency braking. Finally the QC chap forced the VP of his company to sit in the vehicle & did an emergency braking test on their track. Vehicle jumped all over the place. VP Saab promptly sanctioned addition of a simple Load Sensing Proportonal Valve. The cost of the valve was some 150 bucks. But they were trying to save that money also!
Re you query about the no. of channels - you need to jack up the car & look at the way the hydraulic pipes have been routed. And try and see if you can get hold of the Service Manual.
Quote:
Originally Posted by ~~h Glad to know everyone is safe.
BTW : which part of the truck did it hit, I mean even both the headlamps are in shape; more like 'hit a an electric post' or something. |
I need to sit down & talk to my friend. But he currently is having a jolly time in Lavasa. Will update when he gets back.
Quote:
Originally Posted by .anshuman Sx4 has absorbed the impact well here. I feel a solid shell with well designed energy absorbing crumple zones is more important than the number of Airbags in a car. Good thing is car manufacturers have started paying special attention to safety at the time of designing the cars, just look at the number of Euro NCAP 5 star rated we have around compared to the percentage a few years back.
(...)
I do not understand what do you mean to say? Most cars these days which come with 4 channel ABS also come with EBD as standard, and it is EBD(Electronic Brake force distribution) which splits the braking power in milliseconds and gives extra braking power to the wheels in need.
I have been driving ABS equipped cars for years, in total i have driven them for lakhs of kilometers, i have never felt ABS compromised the braking performance, in fact i love the steering and body control offered by ABS under emergency braking. Brake Assist is another awesome feature, which compensates for driver not applying enough force to pedal in an emergency situation.
The only car i know which comes with 3 channel ABS with EBD and Emergency Brake Assist is Mahindra Scorpio. Even in that one compared to non ABS version the braking performance is a lot better.
In fact i feel, apart from ABS even the ESP should be offered as standard equipment. |
If you see the functional requirements, then ABS combined with EBD or ESP meens that it needs individual braking control on each wheel. But afterall the system is eventually controlled by some Algorithm & you can get away with introducing an artificial layer of "virtual feedback".
Actually a German expert on the subject had tried, a few years ago at my client's factory, to explain to me some of the intricacies of the ABS system. Most of it went over my head. But the crux is it is all about signal processing & comparing with a 3D logic-matrix stored in the eprom & then initiating suitable actions. He mentioned that one of the most crucial elements is the correctness of the signal from the wheel sensors. This point had arisen because we were facing customer complaints from FORD re the ABS signals they were getting from the rear axles supplied by my client. Root cause analysis, guided by the expert, revealed that the positioning accuracy of the sensor had to be controlled very accurately.
We then investigated why we were not receiving any complaints from Tata Motors - the axles are basically the same except for some minor differences.
We found that the Sensor Ring specified by Ford ( which was imported) & the ring specified by TML were as different as cheese & chalk. The Ford part was being Electro-Chemical macined on a machine costing Rs. 5 crores whearas the TML unit was being hand drilled on a bench drill costing Rs. 25,000. According to the expert the TML ABS system would have to be set to much lower sensitivity & would have lower effectiveness. TML could advertise "ABS" on the Safari - but how effective it would be? - it seemed more of marketing gimmick than anything else.
Unfortunately the market seems to be going by marketing gimmicks - the latest being voice actuated commands. It take 2-3 seconds for the command to be conveyed & executed. And for you to pull the concerned lever or push the switch - 200- 300 milliseconds. And the chaps cut out essential safety features to keep overall costs in check.
The only way to find out about the ABS sensor ring issue is to do a back to back test of the Safari & Endeavour. If the mods can arrange for some such test I would be happy to assit.