project maker
08-08-2014, 12:18 PM
Braking System:-
INTRODUCTION
Sensotronic Brake Control electric impulses are used to pass the driver’s braking commands onto a microcomputer which processes various sensor signals simultaneously and, depending on the particular driving situation, calculates the optimum brake pressure for each wheel. As a result, SBC offers even greater active safety than conventional brake systems when braking in a corner or on a slippery surface. A high-pressure reservoir and electronically controllable valves ensure that maximum brake pressure is available much sooner. Moreover, the system offers innovative additional functions to reduce the driver’s workload. These include Traffic Jam Assist and Soft Stop Assist.
When it comes time to stop a vehicle, most drivers slowly press on the brake pedal. Even during an emergency situation, studies have shown that almost all drivers will press only partially on the brake pedal for the first few milliseconds until their brain has time to analyze the situation and then the brake pedal is pressed firmly. This slight delay in braking enables the vehicle to travel several meters further and can cause an accident. There are several other factors that delay the vehicle’s response to a braking situation.
CONTRIBUTION OF MECHATRONICS
Mechatronics – a new term is gaining popularity within the automotive industry and is rapidly developing into the catchword of a quiet technological revolution which in many fields stands century-old principles on their head. Mechatronics brings together two disciplines which in many cases were thought to be irreconcilable, namely mechanics and electronics.
Hence automobile functions which hitherto worked purely mechanically and partly with hydraulic assistance will in future be controlled by high-performance microcomputers and electronically controllable actuators. These either replace the conventional mechanical components or else enhance their function. The mechatronic interplay therefore opens up hitherto inconceivable possibilities to further raise the safety and comfort levels of modern passenger cars. For example: it was only thanks to mechatronics that an electronically controlled suspension system which instantly adapts to prevailing conditions when driving off, braking or cornering -- thus providing a totally new driving experience -- became a reality. In 1999 Mercedes-Benz launched this system under the name Active Body Control (ABC) in the flagship CL coupé, thereby signalling the advent of a new era of suspension technology.
This electronically controlled suspension system has quickly been followed by the electronic brake system: Mercedes-Benz and Bosch have teamed up on this benchmark development project which will shortly enter into series production at the Stuttgart automobile brand under the name Sensotronic Brake Control – or .It turns the conventional hydraulic brake into an even more powerful mechatronic system. Its microcomputer is integrated into the car’s data network and processes information from various electronic control units. In this way, electric impulses and sensor signals can be instantly converted into braking commands, providing a marked safety and comfort gain for drivers.
1Electronic brake pedal :
To turn to the technical side: when drivers hit the brake pedal today, their foot moves a piston rod which is linked to the brake booster and the master brake cylinder. Depending on the pedal force, the master brake cylinder builds up the appropriate amount of pressure in the brake lines which – in a tried and tested interaction of mechanics and hydraulics – then presses the brake pads against the brake discs via the wheel cylinder.
In the Mercedes-Benz Sensotronic Brake Control, by contrast, a large number of mechanical components are simply replaced by electronics. The brake booster will not be needed in future either. Instead sensors gauge the pressure inside the master brake cylinder as well as the speed with which the brake pedal is operated, and pass these data to the SBC computer in the form of electric impulses.
To provide the driver with the familiar brake feel engineers have developed a special simulator which is linked to the tandem master cylinder and which moves the pedal using spring force and hydraulics. In other words: during braking the actuation unit is completely disconnected from the rest of the system and serves the sole purpose of recording any given brake command. Only in the event of a major fault or power failure inside the 12V vehicle battery does SBC automatically use the services of the tandem master cylinder and instantly establishes a direct hydraulic link between the brake pedal and the front wheel brakes in order to decelerate the car safely.
ADVANTAGES:
• More stable braking
• Optimum deceleration during cornering
• Stabilization of the vehicle and shorter stopping distances
• Better brake response
• Even wear on brake pad linings and no pedal vibration during ABS operation
6.2 Disadvantages:
• SBC must be deactivated with SDS before any work is performed on the system
• Integrated circuit because containing a microcomputer and costiler
Software failure :
The technology eliminates the mechanical link between the driver’s brake pedal and the brakes, substituting an electrical link that actuates the brake calipers. Customer complaints were linked to the failure of software for the brake system. When the system failed, the hydraulic system took over. But that resulted in a longer stopping distance and additional brake pedal effort by the driver. “Statistically, (the Sensotronic Brake Control is) as good as our other braking systems and sometimes better,” the insider said. “But we cannot get the doubts out of customers’ heads.”
• Mercedes’ SL roadster and the low-volume SLR McLaren and Maybach supercars will retain the brake system until the end of their life cycles.
• It would be too costly to re-engineer those low-volume cars to accommodate a conventional system, a source said.
• Sensotronic Brake Control was supposed to highlight Mercedes’ technology leadership. Instead, it created a double blow to the brand’s image.
CONCLUSION
By this seminar I have studied that, SBC works electronically and thus faster and more precisely than a conventional hydraulic braking system .As soon as you press the brake pedal and the sensors identify the driving situation in hand, the computer makes an exact calculation of the brake force necessary and distributes it between the wheels as required this allows SBC to critically reduce stopiing distances
With SBC Electric impulses are used to pass the driver’s braking commands onto microcomputer which processes various signals simultaneously and depending on the particular driving situations , calculates the optimum brake pressure for each wheel as a result it offers even greater active safety than conventional brake systems when braking in corners or on slippery surface.
INTRODUCTION
Sensotronic Brake Control electric impulses are used to pass the driver’s braking commands onto a microcomputer which processes various sensor signals simultaneously and, depending on the particular driving situation, calculates the optimum brake pressure for each wheel. As a result, SBC offers even greater active safety than conventional brake systems when braking in a corner or on a slippery surface. A high-pressure reservoir and electronically controllable valves ensure that maximum brake pressure is available much sooner. Moreover, the system offers innovative additional functions to reduce the driver’s workload. These include Traffic Jam Assist and Soft Stop Assist.
When it comes time to stop a vehicle, most drivers slowly press on the brake pedal. Even during an emergency situation, studies have shown that almost all drivers will press only partially on the brake pedal for the first few milliseconds until their brain has time to analyze the situation and then the brake pedal is pressed firmly. This slight delay in braking enables the vehicle to travel several meters further and can cause an accident. There are several other factors that delay the vehicle’s response to a braking situation.
CONTRIBUTION OF MECHATRONICS
Mechatronics – a new term is gaining popularity within the automotive industry and is rapidly developing into the catchword of a quiet technological revolution which in many fields stands century-old principles on their head. Mechatronics brings together two disciplines which in many cases were thought to be irreconcilable, namely mechanics and electronics.
Hence automobile functions which hitherto worked purely mechanically and partly with hydraulic assistance will in future be controlled by high-performance microcomputers and electronically controllable actuators. These either replace the conventional mechanical components or else enhance their function. The mechatronic interplay therefore opens up hitherto inconceivable possibilities to further raise the safety and comfort levels of modern passenger cars. For example: it was only thanks to mechatronics that an electronically controlled suspension system which instantly adapts to prevailing conditions when driving off, braking or cornering -- thus providing a totally new driving experience -- became a reality. In 1999 Mercedes-Benz launched this system under the name Active Body Control (ABC) in the flagship CL coupé, thereby signalling the advent of a new era of suspension technology.
This electronically controlled suspension system has quickly been followed by the electronic brake system: Mercedes-Benz and Bosch have teamed up on this benchmark development project which will shortly enter into series production at the Stuttgart automobile brand under the name Sensotronic Brake Control – or .It turns the conventional hydraulic brake into an even more powerful mechatronic system. Its microcomputer is integrated into the car’s data network and processes information from various electronic control units. In this way, electric impulses and sensor signals can be instantly converted into braking commands, providing a marked safety and comfort gain for drivers.
1Electronic brake pedal :
To turn to the technical side: when drivers hit the brake pedal today, their foot moves a piston rod which is linked to the brake booster and the master brake cylinder. Depending on the pedal force, the master brake cylinder builds up the appropriate amount of pressure in the brake lines which – in a tried and tested interaction of mechanics and hydraulics – then presses the brake pads against the brake discs via the wheel cylinder.
In the Mercedes-Benz Sensotronic Brake Control, by contrast, a large number of mechanical components are simply replaced by electronics. The brake booster will not be needed in future either. Instead sensors gauge the pressure inside the master brake cylinder as well as the speed with which the brake pedal is operated, and pass these data to the SBC computer in the form of electric impulses.
To provide the driver with the familiar brake feel engineers have developed a special simulator which is linked to the tandem master cylinder and which moves the pedal using spring force and hydraulics. In other words: during braking the actuation unit is completely disconnected from the rest of the system and serves the sole purpose of recording any given brake command. Only in the event of a major fault or power failure inside the 12V vehicle battery does SBC automatically use the services of the tandem master cylinder and instantly establishes a direct hydraulic link between the brake pedal and the front wheel brakes in order to decelerate the car safely.
ADVANTAGES:
• More stable braking
• Optimum deceleration during cornering
• Stabilization of the vehicle and shorter stopping distances
• Better brake response
• Even wear on brake pad linings and no pedal vibration during ABS operation
6.2 Disadvantages:
• SBC must be deactivated with SDS before any work is performed on the system
• Integrated circuit because containing a microcomputer and costiler
Software failure :
The technology eliminates the mechanical link between the driver’s brake pedal and the brakes, substituting an electrical link that actuates the brake calipers. Customer complaints were linked to the failure of software for the brake system. When the system failed, the hydraulic system took over. But that resulted in a longer stopping distance and additional brake pedal effort by the driver. “Statistically, (the Sensotronic Brake Control is) as good as our other braking systems and sometimes better,” the insider said. “But we cannot get the doubts out of customers’ heads.”
• Mercedes’ SL roadster and the low-volume SLR McLaren and Maybach supercars will retain the brake system until the end of their life cycles.
• It would be too costly to re-engineer those low-volume cars to accommodate a conventional system, a source said.
• Sensotronic Brake Control was supposed to highlight Mercedes’ technology leadership. Instead, it created a double blow to the brand’s image.
CONCLUSION
By this seminar I have studied that, SBC works electronically and thus faster and more precisely than a conventional hydraulic braking system .As soon as you press the brake pedal and the sensors identify the driving situation in hand, the computer makes an exact calculation of the brake force necessary and distributes it between the wheels as required this allows SBC to critically reduce stopiing distances
With SBC Electric impulses are used to pass the driver’s braking commands onto microcomputer which processes various signals simultaneously and depending on the particular driving situations , calculates the optimum brake pressure for each wheel as a result it offers even greater active safety than conventional brake systems when braking in corners or on slippery surface.