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In spring travel measurements, MPM draw-wire displacement sensors are typically mounted in parallel to the shock absorber, to record the data under diff erent road conditions. Based on the obtained displacement signal, vibration velocity and vibration acceleration can easily be determined. In crash tests, multiple MPM draw-wire sensors measure the eff ects of the impact on the vehicle body and passengers. These sensors’ high wire acceleration enables them to measure object movement. In order to optimise the braking behaviour and the pedal travel involved, F50 draw-wire sensors from Micro-Epsilon off er a rotatable potentiometer, which allows the user to select the measuring range within the entire extraction length (150mm). The integrated defl ection pulley enables the sensor to be fl exibly integrated in the footwell or engine compartment.
Combustion engines behaviour Non-contact eddy-current displacement sensors from Micro-Epsilon are proven measuring instruments in combustion engine test benches. In ‘towing’ and ‘fi ring’ modes, non-contact eddy-current displacement sensors detect diff erent parameters that contribute to the improvement of engine characteristics. In particular, the high measuring accuracy provided under harsh conditions in the engine distinguishes the Micro-Epsilon’s eddyNCDT sensors.
Speed of electric motors The development of electric motors has seen a requirement for speed
Temperature monitoring of tyres
Monitoring the behaviour of a combustion engine
measurement to ensure the correct balance of the rotor and stator. Any imbalance would lead to excessive loads and reduced life.
In these applications, the materials used are often not suitable for eddy- current sensors, so Micro-Epsilon developed the CST6110 capacitive-based system that can measure on a wider range of materials. Whether it is electrical conductors (metals) or insulators (plastics, ceramics), they are counted from the fi rst detection with no run-up necessary and without signal quality impairment.
Capacitive sensors can also operate in both very high temperatures and the electromagnetic fi elds that are present in any motor.
emissions with increase in engine performance and torque.
Valve lift measurements Eddy-current sensors from Micro-Epsilon are also proving themselves in test benches for the latest fully-variable valve control systems for passenger vehicles. These systems control individual valves independently of the camshaft. An electro-hydraulic control system provides fully-variable valve control. This means the stroke and opening/closing times of the inlet valve are readily controllable, which reduces fuel consumption and CO2
During the end-of-line inspection of these systems, a test bench simulates the conditions inside the engine, where eddy-current sensors measure the exact valve lift.
Temperature monitoring of tyres From Formula Student to Formula 1, both single-point IR temperature sensors and thermal cameras from the thermoMETER and thermoIMAGER ranges are being used to monitor and understand tyre performance. The thermoIMAGER series of compact thermal imaging cameras has been used extensively for many years, allowing engineers to record and monitor IR video in real time, which is used in determining eff ects of the car set-up and its infl uence on the tyre temperature and operating condition.
CONTACT:
Micro-Epsilon
www.micro-epsilon.co.uk
automationmagazine.co.uk
Automation | May 2022
13
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