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. The second generation DRS MM1, introduced in 1998, based on silicon micromachining and included an integrated linear acceleration sensor element. The key part of this system was a first generation Yaw Rate Sensor DRS 50/100, based on a metal vibrating cylinder. This ESP-System went beyond ABS and Traction Control Systems and offered consumers unsurpassed driving confidence and safety. In addition, the intermeshed fingers enable the transducer to operate effectively at pressure levels substantially above vacuum to permit gas damping of the proof mass.read more read lessĪbstract: 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). The intermeshed fingers reduce the transducer's sensitivity to changes in applied voltage, thereby increasing the accuracy of the frequency signal. The electrodes and the beams each have a plurality of fingers (82, 80) extending laterally outward so that the beam fingers and the electrode fingers are intermeshed with each other. The vibration frequency of the beam is generally related to axial (i.e., compression or tension) forces applied to either one of the fixed ends of the beam so that the magnitude of the force applied can be measured by changes in the vibration frequency. Abstract: A vibratory transducer (22) for an accelerometer (2) having a pair of parallel beams (50, 52) with first and second fixed end portions, and a pair of electrodes (62, 64) positioned adjacent to the beams for generating an electrostatic force to transversely vibrate the beams at a resonant frequency.
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