Summary of Research Projects

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The researchers from INstitute of COmputer TECHnologies (INCOTECH) have more than 30 years experience in the field of rotation speed and rotation acceleration measurements. At first, this science direction has started in State University Lviv Polytechnic and is continued in INCOTECH from 1996. Here is some facts of  the history.

There are 10 proposed methods of measurement for rotation speed and rotation acceleration and 37 patents on measuring instruments on its basis. Three books were published.

The main field of researches are modern methods of measurements, sensors for rotation speed, various tachometers (handheld, laboratory, specialised and virtual) and intelligent tachometric systems. Some applications and samples are shown in Figure 1.  Except the indicated applications the proposed measuring technologies find wide usage in automotive industry. First of all it is measurement of rotation speed and rotation acceleration in ABS and creation automobile tachometers and testers.

Figure 1. Applications and Samples of Designed Measuring Instruments (click image for details)

All developments are based on the novel adaptive measurement methods. First of all it is so called method of dependent count (method with non-redundant time of measurement) and method with non-redundant reference frequency. The main advantages and distinctive features of the first method in comparison with the known are:

•         The extended of specified measuring range from zero speed up to 20 MHz or higher

•         High accuracy up to 10^-4 %

•         Constant error of measurement in the all specified measuring range

•         Non-redundant  time of  measurement due to the possibility of adaptation

•         The possibility to set the error of  measurement previously by user

•         The possibility to measure the frequency, exceeding the reference one

•         Minimum possible hardware

•         The possibility of multichannel synchronous measurements

Such properties make possible to use the proposed measuring technologies in real time measuring systems, for example, in ABS.

The method of measurement with non-redundant reference frequency also has advantages mentioned above. Besides the given method has non-redundant reference frequency. This property allows using of this method of measurement in measuring instruments with low power consumption, for example, in handheld tachometers or specialised automobile testers. Both methods are not critical to the number of gradation of modulating rotor (number of teeth).

Due to the usage of program-oriented methods of measurement it was possible to achieve the minimum possible hardware. The developed measuring instruments can be easily realised on the basis of ASIC, MEMS, ASIP or traditional one-chip microcontrollers like MSC-51/52 (Intel), 20-pins microcontroller from Atmel, metering microcontroller MSP 430 (Texas Instruments) and embedded microcontrollers PIC, etc.

The proposed methods of measurement allow also to measure the rotation acceleration at the usage of the same sensor without additional circuitry.

As sensors of rotation speed the active semiconductor sensors were used. The sensors have sequence of rectangular impulses on its output with 50 % duty cycle. Its amplitude does not depend on rotation speed. Such sensors are suitable for zero speed determination. The same sensors can be used for measurement of rotation acceleration. In comparison with traditionally used passive inductive sensors, active Hall sensors and magnetoresistive sensors, the used sensors have the following advantages:

•  Non-sensitivity to external magnetic fields

•  No magnet (as consequence  - very simple and cheap encoder)

•  Any metallic target: steel, copper, brass, aluminium, nickel, iron

•  The usage only two wires line for signal and power supply transmission

•  The possibility to be used in all modern wheel and sensor assemblies and realised in many  variations

Realisation of the rotary sensor together with the metering microcontroller core in the same chip by the usual CMOS digital process creates the basis for new smart microsystems that will have mostly digital signal processing.

References

[1] Yurish S.Y., Kirianaki N.V. Design of High Performances Digital Tachometers and Tachometric Systems Based on the Method of the Depended Count, In Proceedings of the VII-th International Conference CADSM’ 2003, Lviv-Slavsko, UKRAINE, 18-22 February, 2003.

[2] Kirianaki N.V., Yurish S.Y., Shpak N.O., Deynega V.P., Specialised Tachometric Measuring System on the Basis of Program-oriented Method of Measurement, In Proceedings of 3^rd  Biennial Conference on Measurement for a Sustainable Future,

22-24 September, 1999, Kensington, AUSTRALIA.

[3] Yurish S.Y., Kirianaki N.V., Shpak N.O., Novel Rotation Speed Measurement Concept  for ABS Appropriated for Microsystem Creation. In:  Advanced Microsystems for Automotive Applications 99 (Ed. by Ricken D.E. and Gesner W., Springer, 1999, pp.215-223.

[4] Yurish S.Y., Design Methodology for Reusable Software Components of Intelligent Sensors, In Proceedings of 9^th Symposium on Information Control in Manufacturing (INCOM’98), 24-26 June, 1998, Nancy-Metz, FRANCE, vol. III, pp.33-38.

[5] Kirianaki N.V., Shpak N.O., Yurish S.Y., Virtual Instruments: from Virtual Interface Toward Virtual Measuring Channel, In Proceedings of IEEE International Workshop on Emerging Technologies, Intelligent Measurements and Virtual System for Instrumentation and Measurements (ETIMVIS’98), 15-16 May, 1998, St. Paul, USA, pp.133-137.

[6] Kirianaki N.V., Shpak N.O., Yurish S.Y., Modelling of Smart Integrated Sensors of Rotating Parameters for Automotive Application, In Abstract Booklet of First International Conference on Modelling and Simulation of Microsystems, Semiconductors, Sensors and Actuators (MSM’98), 6-8 April, 1998, Santa Clara, California, USA, T4.2.6.

[7] Kirianaki N.V., Shpak N.O., Yurish S.Y., Intelligent Marine Tachometric System, will appear in Proceedings of IFAC Workshop on Intelligent Components for Vehicles (ICV’98), 23-24 March, 1998, Seville, SPAIN.

[8] Kirianaki N.V., Shpak N.O., Yurish S.Y., Microcontroller Cores for Metering Applications, In Proceedings of International Conference on Programmable Devices and Systems (PDS'98), 24-25 February, 1998, Gliwice, POLAND, pp. 345-352.

[9] Yurish S.Y., Towards Integration of Intelligent Sensors and Virtual Instruments for Measuring and Control Applications, In Proceedings of 3^d IFAC Symposium on Intelligent Components and Instruments for Control Applications, 9-11 June, 1997, Annecy, FRANCE, pp.321-325.

[10] Deynega V.P., Kirianaki N.V., Yurish S.Y., Intelligent Sensor Microsystem with Microcontroller Core for Rotating Speed Measurements, In Proceedings of European Microelectronics Application Conference, Academic Session (EMAC'97), 28 - 30 May, 1997, Barcelona, SPAIN, pp. 112-115.

[11] Shpak N, Yurish S., Kirianaki N., Deynega V., Multifunctional Tachometric System for Tuning and Testing of Turbogenerator's Circuit-Breaker in Electric Power Stations, In Proceedings of International Conference of Management for Power Supply, 3-6 June, 1997, Lviv, UKRAINE, pp.121-122.

[12] Deynega V. P.,  Kirianaki N. V., Yurish S. Y., Microcontrollers Compatible Smart Sensor of Rotation Parameters with Frequency Output, In Proceeding of 21^st European Solid State Circuits Conference, 19-21 September, 1995, Lille, FRANCE, pp.346-349.

[13] Kirianaki N.V., Yurish S. Y., System Design for Multifunctional Tachometers and Virtual Tachometric Systems, In Proceedings of Ukrainian Conference  (Metrology - 95), October 10 - 13, Khar'kov, 1995, p.109. (In Russian)

[14] Kirianaki M.V., Deynega V.P., Yurish S.Y., Miroshnikov V. V., Shevchenko O. Y., Specialised Tachometer for Turbogenerator, Measuring Instruments and Metrology, 1995, No. 51, pp.81-84. (In Ukrainian)

[15] Kirianaki N.V., Deynega V.P., Yurish S.Y., Microprocessor Tachometers of  New Generation for Turbogenerators of Thermal and Nuclear Electric Power Stations,  Automatic, Measurements and Control, 1995, No. 292, pp. 52-60. (In Ukrainian).

[16] Kirianaki  N. V.,  Deynega V. P.,  Yurish S. Y., Tachometer for Tuning and Testing of Anti-Acceleration Protection for Turbogenerators, In Proceedings of FSU Countries Conference on Control and Management in Technical Systems, September 8-10, 1992, Vinnitsa, pp.246 - 247. (In Russian).

[17] Kirianaki N.V., Deynega V.P., Goltsgauzer R.V., Reversible Analog-discrete Tachometer. Instruments and control systems, 1991, No. 4, pp.31-32. (In Russian)