Bosch ESPpremium system features Flexray interface
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Bosch Automotive OE Division product story
Edited by the Engineeringtalk editorial team
Jul 27, 2009
The Bosch ESPpremium system, installed in BMW's current 7 series, features a Flexray interface.
Via this new databus, the system communicates with the corresponding sensors, the ACC adaptive cruise control, the integrated chassis management (ICM) system and the engine and transmission control units.
Compared with the CANbus used to date, Flexray delivers a higher data transfer rate with much larger data packets and is also highly failsafe, according to the company.
Flexray is capable of transmitting event-driven information.
In addition, it provides the option to transmit real-time signals deterministically.
Klaus Meder, a member of the executive management of the Bosch Chassis Systems Control division, said: 'Flexray paves the way for new possibilities of secure networking and provides a very solid basis for comprehensive and time-critical communication by current and future assistance and safety systems in the premium class.' Besides the brake control system, Bosch also supplies the control units installed in the 7 series for the ACC and the diesel engine.
These units also include an interface for the Flexray databus.
The task of the electronic stability program (ESP) is to stabilise the vehicle in critical driving situations by braking individual wheels.
This possibility of electronically controlled braking is also used by assistance systems such as the Stopandgo function of the ACC adaptive cruise control.
In combination with the passenger restraint system control unit, the ESP sensor signals also assist processes such as faster airbag deployment.
The real-time exchange of increasingly large amounts of data is a vital requirement for these and all future systems.
Flexray provides fast, failsafe data communication with transmission options in up to two channels.
These channels can be scaled flexibly and used either for redundant, error-tolerant data transfer at up to 10Mbit/s or for high data transfer performance at up to 20Mbit/s.
In comparison, the high-speed variant of the CANbus that has commonly been used up to now achieves 1Mbit/s.
Alongside BMW, Daimler, Freescale, General Motors, NXP Semiconductors and Volkswagen, Bosch is a Flexray consortium core partner and played a key role in the standardisation of the protocol.
In addition, Bosch developed a protocol controller module for Flexray that passed the conformance test as early as 2006.
Eight semiconductor companies have so far purchased a manufacturing licence for this module.
It is the basis for several elements featuring a Flexray interface and has played a role in making the required hardware components available around the world.
Additionally, Bosch has developed Cubas: a basic software program for control units that already incorporates the Autosar-standard Flexray protocol stack.
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