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Abstract
This study analyzed the possibilities to validate the indications of sensors for yaw rate and lateral acceleration within the scope of extended diagnostic routine of the car ESP system at Vehicle Inspection Stations (SKP). The stand tests were performed using the reference sensors and a standard diagnostic tester. The comparison of the yaw rate and lateral acceleration results obtained from the working sensor under examination, recorded with the V box unit, and the results from the reference sensor demonstrated a good conformity both in quality and quantity. But these tests were demonstrated also a pure conformity (both in quality and quantity) with runs obtained from tester. The Root Mean Square (RMS) was used as factor of qualitative estimation. These inconveniences were caused from in sampling frequency incompatibility and lack of recording synchronization for signals from the tester and from reference sensors. The primary importance question is a firmware modification for selected testers. Such a tester should be able to record signals from a reference sensor and have a set sampling frequency for signals from a working sensor. On the basis of already carried out research analyses the suggested frequency should be no fewer than about of 10 Hz. It resulted from a spectral analysis carried out for possessed runs maintaining the Nyquist limit frequency.
Highlights
A proper operation of the ESP system requires signals obtained from many sensors; among others from the sensors of lateral acceleration ay and yaw rate dψ/dt
Co ncluThseiocnomspfarroismonsotfathnedytaewsrtaste and lateral acceleration results obtained from the working sensor under examination, recorded with the Vbox unit, and the results from the reference sensor
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Summary
A proper operation of the ESP system requires signals obtained from many sensors; among others from the sensors of lateral acceleration ay and yaw rate dψ/dt. The focus of studies on preparation of such verification procedures should be as follows: a) Preparation or supplementation or extension of the tester internal programs which enable the indication accuracy of ESP sensors to be evaluated in relation to the reference sensor indications and the estimation if the accuracy is suitable for a proper operation of the ESP system; b) Within the framework of the previous item “a” establishing a sampling frequency for signals received by the diagnostic tester from operating sensors and synchronizing them with signals from reference sensors to enable a qualitative analysis by comparison of their runs; and establishing the quantitive evaluation coefficient, as it is for evaluation of brakes or shock absorbers; c) As the further extension of item “b”, as before, establishing the evaluation coefficient both for yaw rate and lateral acceleration for the appearance of sideslip angle limiting value which should initiate reaction of the ESP system Such a test, according to studies conducted by the research team from the Institute of Automotive Vehicles and Combustion Engines, Cracow University of Technology [7] could be performed at a diagnostic line using plate stand (a wheel play detector unit), where a given repeatable plate excitation is executed with the axle wheels of vehicle’s front or rear set up on detection plates. In the author’s study the factor analysis was carried out to analyze influences of selected vehicle parameters (i.e., stiffness and lateral damping in tires, wheelbase, and moment of inertia round coordinate axes of vehicle) on angular vibration runs
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