Figure: Chain dynamics

Measurements on timing drive

Problem: Increase of pollutant emissions

Goal: Precise design of timing drive

The focus of automotive development for internal combustion engines is on reducing of fuel consumption and pollutant emission. Timing drives and valve trains also determine the efficiency of combustion processes. They serve to synchronize the crankshaft and camshaft to control the opening and closing behavior of the valves. A dynamically not optimally tuned timing drive reduces the service life of the components and increases pollutant emissions.

To examine the timing and valve trains, a multi-channel speed measurement is carried out on the camshafts and, by means of a rotary encoder, a measurement of the position and rotational speed on the crankshaft. In combination with analog measured 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 on the chain guides. The recorded measured values are evaluated in the time and spectral domain.

The recorded measured values are evaluated in the time and spectral domain.

Furthermore ROTEC ENGINEERING provides you with support and technical engineering know-how for problems related to vibration analysis of engines, transmissions and drive trains. With our know-how, we make a valuable contribution to your product in the areas of timing gear validation, valve train optimization, clutch design, transmission errors (TE), transmission optimization, oil supply optimization, powertrain measurement and optimization, current and voltage analysis, and the application of measurement technology.

 

Time Domain
Analyses

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  • Chain/belt 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

Spectral Domain
Analyses

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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

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