Kistler Instruments Ltd. - PRODUCT NEWS
Precision assembly is key to novel fuel injection system
The Kistler (www.kistler.co.uk) electromechanical NCFT servo press module is being used to provide the essential assemble precision and repeatability for a new type of fuel injection system. The new system is both low cost and simple enough to be viable on small engines from 50 to 250 cc, a range that covers everything from lawnmowers and small marine outboard motors to motorcycles and scooters.
The rig used by Scion Sprays to hold the components in place during laser-welding uses a Kistler NCFT servo press module. These modules are simple to install requiring only a 3-phase electrical supply and have integral piezoelectric force and absolute encoder displacement monitoring capabilities that simplify the precise programming of home position, return stroke, joining stroke and an intermediate position. Of special importance to Scion Sprays is the 0.005 mm repeatability of the NCFT units under real world, production conditions ensuring that the injector pulse volume of 1 µl (one micro litre) is maintained during quantity production.
Designed and manufactured by Scion Sprays, the new system avoids the need for expensive high pressure fuel pumps and complex electronics by using Pulse Count Injection (PCI), which injects a small, geometrically fixed volume of fuel repeatedly into the engine intake manifold rather than the Pulse Width Modulation used by conventional systems. The amount of fuel injected is determined by the number of pulses injected during the intake phase of the cycle. Typically, the pulse volume is 1 µl and the pulse frequency greater than 1 kHz. In this way, the injector acts as both pump and flow meter.
In addition to reliability, simplicity and low cost, the Scion Sprays PCI injectors make a valuable contribution to environmental protection by reducing emissions of HC+NOx by 35% and CO by over 88% compared to a standard carburettor fitted engine and minimises the amount of unburned oil in the exhaust of 2-stroke engines.
Established in Winterthur (Switzerland) in 1957, the Kistler Group now has a worldwide presence with 25 group companies and 30 distributors ensuring prompt, local application support and short delivery times. With a staff of more than 1050, the Kistler Group is one of the world's leading providers of dynamic measuring instrumentation with a turnover of 210 million Swiss Francs (GBP 145M) in the 2010 financial year.
Kistler's core competence is the development, production and use of sensors for measuring pressure, force and acceleration. Kistler's know-how and electronic systems can be used to prepare measuring signals for use in analysing physical processes, controlling and optimising industrial processes, improving product quality in manufacturing and improving performance in sports and rehabilitation.
Kistler offers a comprehensive range of sensors and systems for engine development, automotive engineering, plastics and metal processing, installation technology and biomechanics.
Heavy investment in research and development, 15% of staff worldwide are engaged in research and development, has generated a number of innovations using piezoelectric, piezoresistive and capacitive techniques to provide solutions to numerous force, pressure and acceleration measuring problems. These innovations include the world's first commercial quartz sensor, two-wire constant current technology to integrate sensors with microelectronic circuitry, high-temperature pressure sensors for use up to 400 Deg C and three-component force measuring sensors.
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