Sensotronic Brake Control (SBC) is an electro-hydraulic brake system, where the wheel brake cylinders on a vehicle are operated through a servomechanism.
In a pure hydraulic brake system, the driver applies force to a pedal by a mechanical link which then directly applies force to the master brake cylinder. In turn the master brake cylinder develops hydraulic pressure inside the wheels.
In contrast, the SBC operates the brakes using brake fluid supply from a hydraulic high-pressure reservoir, which is sufficient for several braking events. A piston pump driven by an electric motor supplies a controlled brake fluid pressure at range between 140 bars (2,000 psi) and 160 bars (2,300 psi) in the gas diaphragm reservoir. [2]
When the driver presses the brake pedal—or when electronic stability control (ESP) intervenes to contrast the vehicle—the SBC control unit will calculate the desired target brake pressures on each individual wheel. Through the use of independent pressure modulators the system regulates a hydraulic pressure at each wheel. These four pressure modulators consist of one inlet and one outlet valve, controlled by electronic output stages.
The system employs a travel sensor and a pressure sensor at the pedal to measure the speed and force of the driver's command. The control unit processes this information and generates the control signals for the wheel pressure modulators. Normally, the master brake cylinder is detached from the brake circuit. A pedal travel simulator creates normal pedal feedback. If ESP intervenes, the high-pressure reservoir supplies the required brake pressure quickly and precisely to selected wheels, without any driver involvement.
Advantages and disadvantages
With fine-grained control of pressure at each wheel, SBC offers a unique platform in which to implement skid protection and traction control compared to cf.[clarification needed]Anti-lock braking system (ABS) and Electronic Stability Program (ESP), respectively. Moreover, the system offers innovative functions to reduce the driver's workload. These include Traffic Jam Assist, which brakes the vehicle automatically in stop-and-go traffic once the driver takes his or her foot off the accelerator. The Soft-Stop function—another first—assists with smooth stopping in town traffic.
In case of computer failure, SBC reverts to a hydraulic master cylinder, but driver effort and stopping distance is reported to increase.[3] In case of pump failure the high-pressure reservoir is capable of retaining enough pressure to stop the vehicle electronically. Information on other types of failure remain an open question.
Industry recognition
In 2001 the μ-Club, an association of international experts in the field of brake technology, honored Robert Bosch and Daimler Chrysler for the development of the electrohydraulic brake SBC.
Problems
In May 2004, Mercedes recalled 680,000 vehicles equipped with the system; in March 2005 a total of 1.3 million vehicles were recalled. In 2006 high-volume models such as the E-class returned to conventional hydraulic brake systems. Low-volume luxury models such as the SL, the Maybach and the SLR continued to use SBC due to the prohibitive cost of redesign.[3]
In a letter—only to US customers—dated August 2018 a warranty addendum was sent extending coverage for 25 years and unlimited miles on the following SBC components.
^"Sensotronic Brake Control: System Information". Bayhas.com. Retrieved 2017-03-25.
^ ab"Mercedes cancels by-wire brake system; decision a blow to technology's future: AutoWeek Magazine". Autoweek.com. 2005-12-15. Retrieved 2018-07-01.
^Mercedes Benz Extended Warrantee Coverage Addendum
August 20, 2023
sensotronic, brake, control, this, article, multiple, issues, please, help, improve, discuss, these, issues, talk, page, learn, when, remove, these, template, messages, this, article, needs, additional, citations, verification, please, help, improve, this, art. This article has multiple issues Please help improve it or discuss these issues on the talk page Learn how and when to remove these template messages This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Sensotronic Brake Control news newspapers books scholar JSTOR June 2009 Learn how and when to remove this template message This article contains content that is written like an advertisement Please help improve it by removing promotional content and inappropriate external links and by adding encyclopedic content written from a neutral point of view June 2016 Learn how and when to remove this template message Learn how and when to remove this template message Sensotronic Brake Control SBC is an electro hydraulic brake system where the wheel brake cylinders on a vehicle are operated through a servomechanism The SBC system developed by Daimler and Bosch was introduced on the R230 SL class which went on sale in Europe in October 2001 1 Contents 1 How it works 2 Advantages and disadvantages 3 Industry recognition 4 Problems 5 Sensotronic Brake Control applications 6 Other production electro hydraulic brake systems 7 ReferencesHow it works EditIn a pure hydraulic brake system the driver applies force to a pedal by a mechanical link which then directly applies force to the master brake cylinder In turn the master brake cylinder develops hydraulic pressure inside the wheels In contrast the SBC operates the brakes using brake fluid supply from a hydraulic high pressure reservoir which is sufficient for several braking events A piston pump driven by an electric motor supplies a controlled brake fluid pressure at range between 140 bars 2 000 psi and 160 bars 2 300 psi in the gas diaphragm reservoir 2 When the driver presses the brake pedal or when electronic stability control ESP intervenes to contrast the vehicle the SBC control unit will calculate the desired target brake pressures on each individual wheel Through the use of independent pressure modulators the system regulates a hydraulic pressure at each wheel These four pressure modulators consist of one inlet and one outlet valve controlled by electronic output stages The system employs a travel sensor and a pressure sensor at the pedal to measure the speed and force of the driver s command The control unit processes this information and generates the control signals for the wheel pressure modulators Normally the master brake cylinder is detached from the brake circuit A pedal travel simulator creates normal pedal feedback If ESP intervenes the high pressure reservoir supplies the required brake pressure quickly and precisely to selected wheels without any driver involvement Advantages and disadvantages EditWith fine grained control of pressure at each wheel SBC offers a unique platform in which to implement skid protection and traction control compared to cf clarification needed Anti lock braking system ABS and Electronic Stability Program ESP respectively Moreover the system offers innovative functions to reduce the driver s workload These include Traffic Jam Assist which brakes the vehicle automatically in stop and go traffic once the driver takes his or her foot off the accelerator The Soft Stop function another first assists with smooth stopping in town traffic In case of computer failure SBC reverts to a hydraulic master cylinder but driver effort and stopping distance is reported to increase 3 In case of pump failure the high pressure reservoir is capable of retaining enough pressure to stop the vehicle electronically Information on other types of failure remain an open question Industry recognition EditIn 2001 the m Club an association of international experts in the field of brake technology honored Robert Bosch and Daimler Chrysler for the development of the electrohydraulic brake SBC Problems EditIn May 2004 Mercedes recalled 680 000 vehicles equipped with the system in March 2005 a total of 1 3 million vehicles were recalled In 2006 high volume models such as the E class returned to conventional hydraulic brake systems Low volume luxury models such as the SL the Maybach and the SLR continued to use SBC due to the prohibitive cost of redesign 3 In a letter only to US customers dated August 2018 a warranty addendum was sent extending coverage for 25 years and unlimited miles on the following SBC components Hydraulic control unit Hydraulic Pump Pressure Reservoir Brake Operating Unit Front and Rear wheel speed sensors Brake lamp switch Yaw Rate SensorOut of warranty repairs of these items can be reimbursed by MB if proper documentation is provided 4 Sensotronic Brake Control applications Edit2003 2006 E Class W211 SLR Maybach 2003 2006 Mercedes Benz CLS Class W219 2001 2011 SL ClassOther production electro hydraulic brake systems EditToyota Prius Introduced in 1997 uses an ehb system from Advics Toyota Estima Hybrid Introduced in 2001 in Japan Ford Escape Hybrid Introduced in 2003 Acura NSX 2nd generation Introduced in 2015 Audi e tron Introduced in 2018 References Edit Mercedes luxury transformer NZ Herald 2001 08 11 Retrieved 2009 07 31 Sensotronic Brake Control System Information Bayhas com Retrieved 2017 03 25 a b Mercedes cancels by wire brake system decision a blow to technology s future AutoWeek Magazine Autoweek com 2005 12 15 Retrieved 2018 07 01 Mercedes Benz Extended Warrantee Coverage Addendum Retrieved from https en wikipedia org w index php title Sensotronic Brake Control amp oldid 1166245159, wikipedia, wiki, book, books, library,
