1) Emergency brake assist (EBA)
sometimes, the driver is not able to exert maximum braking effort even during emergency. This system, introduced by Mercedes-Benz serves to help in such a situation. Here, the system detects the extent of emergency from the speed at which the driver lifts his foot from the pedal and stamps the brake. Accordingly, it applies maximum servo braking force till the car actually stops or till the driver removes his foot from the brake pedal. It must be noted that for obvious reasons, EBA can only be employed when ABS is fitted.
sometimes, the driver is not able to exert maximum braking effort even during emergency. This system, introduced by Mercedes-Benz serves to help in such a situation. Here, the system detects the extent of emergency from the speed at which the driver lifts his foot from the pedal and stamps the brake. Accordingly, it applies maximum servo braking force till the car actually stops or till the driver removes his foot from the brake pedal. It must be noted that for obvious reasons, EBA can only be employed when ABS is fitted.
2) Dynamic braking system (DBS)
Such a system controls the braking force to individual wheels at all the time depending upon the load carried by each wheel at any time. For example, consider braking while the car is taking a right turn. Due to braking, weight transfer will take place from the rear to the front, whereas due to centrifugal force on turn, the weight transfer would occur from right to left. Accordingly, the load carried by the four wheels in the decreasing order, would be on the 1 left front wheel, 2 left rear wheel, 3 right front wheel and 4 right rear wheel. A dynamic braking system would accordingly apply the braking force to different wheels, thus avoiding skidding. While ABS starts operating only when the wheels are about to lock, dynamic braking system monitors speed and load conditions at the wheel, at all times. However dynamic systems are much more expensive and at present their use is limited only to high end luxury cars.
3) Brake by Wire (BBW)
In this system there is no mechanical link between the brake pedal and the brake applying device at the wheels. Depending on the pressure applied by the driver on the brake pedal and speed of its application, a signal goes to each wheel and applies the brakes there in the optimum way.
There are basically two circuits. The brake pedal or lever is connected to a hypersensitive rheostat which measures electric resistance. Depending on the force applied on the brake pedal, it would move and the more it is pushed, the greater would be the electric signal sent to the brake computer, which would then send commands to the servo pump to maintain the desired pressure into the secondary circuit which is basically hydraulic. Depending on the command signal, the servo pump would pressurize the secondary circuit and the brakes would be applied as in any common hydraulic brake system. As the brakes are applied, the fluid pressure is measured by sensors and a signal is sent back to the brake computer, which further sends feedback signal to the brake resistor to provide 'feel' to the driver. The advantages of a By-wire braking system are :-
1. The brake pedal can be placed anywhere as per convenience since it is no longer restricted by the plumbing in the hydraulic circuit.
2. There being no mechanical contact between the brake pedal and the hydraulic circuit, there will not be any pulsations of the pedal when the ABS is working.
3. No holes are necessary in the bulk head in this system, for the brake mechanical linkages to pass through.
4. It can interact with intelligent cruise control system to maintain preset distance from the vehicle in front and to completely halt the car in case of emergency. All this is done automatically.
Sensotronic Brake control (SBC) , a brake-by-wire system of Mercedes-Benz is now being employed in their higher-end cars including E, SL 500 and Mayback. SBC is also linked with ABS and ESP (stability control) system, taking into account steering angle, lateral acceleration and individual wheel rotation speed, when brakes are applied.
There are basically two circuits. The brake pedal or lever is connected to a hypersensitive rheostat which measures electric resistance. Depending on the force applied on the brake pedal, it would move and the more it is pushed, the greater would be the electric signal sent to the brake computer, which would then send commands to the servo pump to maintain the desired pressure into the secondary circuit which is basically hydraulic. Depending on the command signal, the servo pump would pressurize the secondary circuit and the brakes would be applied as in any common hydraulic brake system. As the brakes are applied, the fluid pressure is measured by sensors and a signal is sent back to the brake computer, which further sends feedback signal to the brake resistor to provide 'feel' to the driver. The advantages of a By-wire braking system are :-
1. The brake pedal can be placed anywhere as per convenience since it is no longer restricted by the plumbing in the hydraulic circuit.
2. There being no mechanical contact between the brake pedal and the hydraulic circuit, there will not be any pulsations of the pedal when the ABS is working.
3. No holes are necessary in the bulk head in this system, for the brake mechanical linkages to pass through.
4. It can interact with intelligent cruise control system to maintain preset distance from the vehicle in front and to completely halt the car in case of emergency. All this is done automatically.
Sensotronic Brake control (SBC) , a brake-by-wire system of Mercedes-Benz is now being employed in their higher-end cars including E, SL 500 and Mayback. SBC is also linked with ABS and ESP (stability control) system, taking into account steering angle, lateral acceleration and individual wheel rotation speed, when brakes are applied.
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