ABS | Anti-Lock Braking System Part -3 | Institute of Automotive and Powertrain Engineering

ABS | Anti-Lock Braking System Part -3 | Institute of Automotive and Powertrain Engineering


now what is the goal of abs the goals are first limiting the slip in order to preserve lateral forces that means that you’re not always are at the limit mu H multiplied by the vertical force it should be possible that the adhesion limit is reached so your abs is operating in this area or in case of cornering in this or this area so you have some possibility to have some lateral forces and the brake pressure from the driver is reduced now let’s have a look at the ABS components what do you have you have first pedal the brake pedal and brake booster so you have here a foot and then the driver so from this you have here a cylinder and from this brake cylinder you have two hydraulic houses to your hydraulic unit so there have to be two circuits and so you need this two hydraulic houses to the hydraulic unit and this is a central unit of your and this is a central unit of your a B s from this central unit you have hydraulic lines to each piston at each brake now this is a hydraulic part of your abs and now the electronic part you have at each wheel rev counter at each wheel a rev counter and this go to your ABS unit – so these are the components of an ABS and we have a closer look what happens inside the ABS visas the inner of the hydraulic unit of Navy s you have here the brake pedal the brake pedal you have here the booster for brake forces then you have here cylinder with your 2 1 & 2 with your two hydraulic houses – your hydraulic unit this is a hydraulic unit and what you see you see here you have a front wheel right and the rear wheel left in one circuit and in the other you have a front wheel left and rear wheel right in the other circuit so that means you have a X breaking circuits this is not necessary but in this example we have an ex breaking circuit now to the components for each piston this is one piston for breaking for each piston you have one input love and one output valve so for each here an input urine output so you have eight valves at all input output output and input additionally you have here a reservoir for the fluid and you have here a pump in each circuit driven by this motor now what happens the driver presses here the pattern the brake pressure increases P increases and normal condition under normal condition this valve is open the input 1/2 is open and the output valve is closed so the pressure goes directly to the piston and the wheel breaks now if the brake pressure is too high and one of the wheels locks then first the input valve can be closed then the pressure is constant in this area of the hydraulic circuit if the wheel locks for constant pressure then additionally the output valve can be opened and then the pressure decreases and this is the idea of an ABS you can by closing the input valve keep the pressure constant or by opening the output valve decrease the pressure


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