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16/08/2011
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With an edge length of just 10.3mm, the new SMG10x-series micromechanical rollover sensors are the smallest yaw-rate sensors Bosch has ever built for cars. Compared to the previous, second-generation sensors (SMG06x), this equates to a 65% saving in space required.
 The two models in the new series are functionally identical but have different operating voltages and serial peripheral interfaces (SPI): The SMG102 takes a 3.3V supply and has a Bosch SPI, while the SMG101 has an operating voltage of 5V and an open SPI. The standard measurement range is for a rollover velocity of up to ±240°/s; alternatively, they can be programmed for ±300°/s ex works.
They have a very high overload resistance. Signal limiting will not occur below 600°/s. This value is more than a twofold improvement on the sensors of the previous generation. High reliability is guaranteed by comprehensive electrical and mechanical self-testing, and continuous monitoring of the signal. This means the SMG10x series of sensors is particularly suited to safety-criticial applications.
As part of the airbag system, the task of a rollover sensor (also known as RoSe sensors) is to recognize as quickly as possible when a car's inclination is changing – for instance when it is threatening to roll over. This allows protective seat-belt pretensioners, head and side airbags, and rollover bars to be activated before the vehicle's roof or side hits the ground. However, this life-saving technology is only being adopted relatively slowly in the mass market.
As a result, on average one in five traffic accidents in the United States involving a vehicle rollover still causes death. For the US government, this figure is far too high, and from September 2013 it will gradually tighten the legal requirements for occupant protection in the event of vehicle rollovers. From late 2017, all new vehicles in the US will have to comply with the new requirements.
Bosch sets the pace in MEMS (micro-electro-mechanicals systems) technology. The company has manufactured well over 1.6 billion MEMS sensors since production began in 1995. This makes Bosch the global market leader in MEMS sensors. Its product portfolio comprises pressure sensors, acceleration sensors, yaw-rate sensors, mass flow sensors, and torque sensors for a variety of automotive and consumer electronics applications.
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Author
John Challen
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