New Generation of Inertial Sensor Cluster for ESP- and Future Vehicle Stabilizing Systems in Automotive Applications 2003-01-0199
In 1995 Robert Bosch GmbH (RB) started the mass production of the first VDC-System (Vehicle Dynamics Control system) for vehicles, today called ESP (Electronic Stability Program). This ESP-System went beyond ABS and Traction Control Systems and offered consumers unsurpassed driving confidence and safety.
The key part of this system was a first generation Yaw Rate Sensor DRS 50/100, based on a metal vibrating cylinder. The second generation DRS MM1, introduced in 1998, based on silicon micromachining and included an integrated linear acceleration sensor element.
For new additional functions of ESP and of future high dynamic and high performance vehicle stabilizing systems, like Hill Hold Control (HHC) or Steer by Wire (SbW) BOSCH develops the third generation, a flexible and cost-effective Inertial Sensor Cluster with a modular concept for hard- and software, called DRS MM 3.x.
For all inertial sensor elements silicon surface micromachining is used. A fully digital signal processing with delta-sigma (Δ∑-) modulation in closed or open loop control is implemented into ASICs, the communication between the sensor elements and the internal microcontroller takes place via a SPI-interface. Internal logical links and self monitoring, CAN-interface between the Sensor Cluster and the ECUs and the possibility of internal redundancy for high safety-relevant, high dynamic and performance systems meet the future requirements.
Design, basic functions, modular concept, safety features and system requirements of the new Inertial Sensor Cluster DRS MM 3.x are presented.