Critical pressure measurements throughout Jaguar's test cars.
Jaguar Cars Limited are using the latest PMP 317 series of
Druck automotive pressure transducers for monitoring performance
critical pressure measurements on their preproduction test cars.
The sensors provide pressure data during a series of intensive climatic
and durability tests to analyse performance under extremes of temperature
and high-speed operation.
A recent example is the XKR super charged test car which is fitted with
PMP 317 transducers throughout, for example the power steering, air
conditioning, fuel, brake, exhaust, cooling, crank and engine/transmission
systems. Ranges of pressures measured vary from -0.7 bar up to 100 bar
ambient, with pressure spikes up to 250 bar. The compact and rugged
design of the advanced micromachined silicon transducer enables it to
provide accurate and reliable pressure measurements whilst operating
in the extreme temperature, shock and vibration environment of automotive
test applications.
For example, Jaguar test cars complete intensive tests in the Nevada
desert with ambient temperature up to 125°C and in Northern Canada
to -40°C. They are also subjected to high speed testing in Europe at
full throttle for several weeks. Pressure data is of crucial importance
when assessing the performance of all car systems before, during and
after these tests.
Once the individual car system designs are approved, pressure data
is archived for use on future projects. An example is the recent launch
of the X-type car, rolled out from initial concept to showroom display
in less than three years. At the heart of the PMP 317 series, a
micromachined silicon sensing element is mounted within a high
integrity pressure module constructed from Stainless Steel 316L and
Hastelloy C276. This provides high measurement accuracy with hostile
media compatibility and high over-pressure ratings. The temperature
compensated signal is a customer specific high level output voltage
ideal for interfacing with data acquisition hardware, and a choice of
pressure/electrical connections are available.
In addition, the PMP 317 can be powered directly from the vehicle
battery, even during the cold start cycle. Gauge or absolute ranges
are available up to 700 bar, with temperature range up to 125°C.
A mechanical shock of up to 1000g in each of three mutually perpendicular
axis will ilot affect performance, and vibration response is less than
0.05% FS./g at 30g peak from 10Hz to 2kHz.
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GE Druck Ltd.
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December 2001
