Figure: Chain dynamics

INVESTIGATIONS IN THE TIMING DRIVE

In internal combustion engines, timing drive and valve train are used to synchronize the crankshaft and camshaft in order to control the opening and closing behavior of the valves. To investigate timing drive and valve train, a multi-channel speed measurement is performed on the camshafts and, by means of an encoder, a measurement of the position and rotational speed on the crankshaft. In combination with analog measurement variables, the measurements provide a comprehensive overall picture of the dynamic behavior of the timing drive under different load conditions. Analog measured variables can be, for example, the oil pressure of the chain tensioner, chain force and accelerations at the guide rails.

ANALYSES IN TIME DOMAIN

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  • Chain/belt forces
  • Tensioner forces
  • Vibration angle and angular displacement analysis
  • Oil pressure conditions at hydraulic tensioners
  • Closing behaviour of check valves and PRV-s
  • Identification of loss of control
  • Detection of belt vibration and chain hitting
  • Detection of start-up noises

ANALYSES IN SPECTRAL DOMAIN

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  • Classic order and frequency analysis
  • Verification of resonance behaviour of the whole drive
  • Analysis of excitations in amplitudes and phases
  • Preparation of envelopes with combination of measurements
  • Optimization of excitation phases (high pressure pumps)
  • NVH analysis in focus of belt and chain noises