Active Suspension Systems / 主動懸掛系統
High-speed trains are essential to reduce travelling distances between two
points. However, higher speeds have their downsides, namely increased forces and
accelerations, which have a negative effect on ride comfort. As conventional
passive suspension systems fall short to address these needs, active suspension
technologies can be implemented to maintain or improve ride comfort at increased
vehicle speeds or under unfavorable track conditions.
An active, computer-monitored, suspension system relies heavily on accurate
readings provided by high-tech accelerometers, which is where our MEMS
accelerometers truly shine.
Accurate vibration sensing – the key to enhanced ride comfort
Colibrys MEMS accelerometers provide precise and stable vibration measurements
even under harsh conditions, feeding this information into the control system
for the active suspension and allowing it to adjust accordingly so that
passengers benefit from an enhanced ride comfort. Using our sensors, the
vibrations of the car body can be reduced by 66%.
Moreover, a MEMS accelerometer also increases the lifespan of the suspension
system itself, as it provides valuable data that allow for the planning of
maintenance and repair work, saving essential maintenance costs in the long run.
The MEMS revolution
There are many sensing technologies (capacitive, piezoelectric, piezoresistive,
etc.) competing to provide the best solution for today’s active suspension
applications, but none offer the same level of performance in terms of long-term
stability, temperature stability and precision as MEMS capacitive products,
which are not only qualified for safety critical applications, but are also
designed to operate in harsh environments.
Measuring vibration
Our accelerometers are extra-small high-end products that combine together large
bandwidth, robustness and low power designs, featuring an excellent bias
stability, which serves as a guarantee for reliability. Colibrys provides a MEMS
capacitive sensor which features a bulk micro-machined silicon element, a
low-power ASIC for signal conditioning and a temperature sensor.
Advantages of our vibration sensors
Colibrys vibration sensing MEMS accelerometers are defined by low power
consumption, high calibration, robustness and stability, with the electronic
configuration providing a solid power on reset and ensuring a full protection
against brown-outs. They come in extra-small LCC20 packaging (8.9mm x 8.9mm) and
are characterized by an outstanding large and flat frequency response from DC 0
Hz to 1500 Hz ±5% (min) and a full scale range of ±2g to ±200g.
The new vibration sensor optimized architecture offers exceptional temperature
stability with So ± 0.2 mg/°C (min/max) and Sz 120 ppm/°C (typ) from -55°C to
+125°C. It also embeds an overload detection and recovery after shocks. The
non-linearity becomes almost nonexistent with 0.1 % of full scale, under
vibrations (typ). It offers the lowest noise of 7 μg/√Hz in band with the 2g
range (typ). It can measure from ±2g to ±200g.
Colibrys – the stable ride towards innovation
Colibrys produces MEMS capacitive accelerometers renowned for high reliability
under harsh conditions, devices that have been successfully tested and
implemented in safety critical railway applications.
One of our most resonating achievements was the Colibrys sensors to be
successfully qualified for the latest generation of German ICE high speed
trains. The Velaro D train is the fourth generation of interoperable high-speed
trains made by Siemens using distributed traction and the first integrating
innovative bogie monitoring systems.
Colibrys accelerometers for active suspension systems
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The new Colibrys VS1000 –
a new reference for low to medium frequency MEMS sensing (DC 0 Hz to 1500
Hz) – offers the best performance stability with shock resistance, as well
as the lowest non-linearity and noise in the marketplace. Each product is
fully tested and qualified to the highest Colibrys standards. It embeds a
self-test function for your confidence at all time.
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The legacy Colibrys VS9000 –
the trusted MEMS for the most demanding applications involving vibration
sensing since 2008 – it offers large frequency response and performance
stability, as well as low power consumption.
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