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Article Excerpt
Vehicle dynamic control systems, or electronic stability program systems-- which typically include a yaw rate (or angular velocity) sensor for measuring yaw (or turn) of the vehicle and a low-g lateral accelerometer to determine whether the car is sliding laterally-are safety systems that enhance vehicle stability and steerability when the limit of adhesion between the tires and the road is approached. The ESP, or vehicle stability control, system, which helps the driver maintain or regain control of the vehicle when it starts to skid, has heretofore been implemented more widely in Europe than in North America.
However, ESP systems have clear opportunities to increasingly penetrate North American vehicles (including non-high-end vehicles), as the cost of implementing such systems declines, their versatility is enhanced, and automakers implement more advanced system features (such as rollover sensing, steer-by-wire, or active suspension. The inertial sensor cluster (consisting of single or multiple yaw rate sensors and acceleration sensors) offers a streamlined and cost-effective means of providing angular velocity (rate of rotation) and acceleration information to the ESP system or to multiple advanced systems in the vehicle.
The implementation of inertial sensor clusters in the vehicle can be impeded because it requires expertise and some effort to integrate multiple functions in a single system. However, the prevailing trend is to embrace the concept of an inertial sensor cluster to send information to other systems as required. The goal is to have a six-degree-of-freedom IMU (inertial measurement unit) in the vehicle that would send information to the varied systems that would require inertial data (such as ESP, electronic parking brake, navigation, rollover detection, etc.).
Robert Bosch (Stuttgart, Germany/Farmington Hills. MI, 248-553-9000)(www.bosch.com), which has been at the forefront of VDC/ESP system development and commercialization, has developed a third-generation inertial...
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