Due to increasing expectations for gasoline like sound quality, today's diesel engines for light and medium duty automotive markets needs to be carefully designed from NVH perspective. Typical engine operating conditions such as low idle, light tip in, tip out demand more attention as they are more prone to generating sound quality concerns. Any abrupt change in the noise signature may be perceived as a sign of malfunction and could have a potential to generate warranty claims. In this paper, an experimental investigation was carried out to determine the root cause of the transient oil pressure regulator buzz noise which occurred during no load transients at low engine speeds. The root cause of the objectionable noise was found to be associated with the impacts of the regulator plunger on the valve seat at certain engine speeds. Noise and vibration diagnostic tests confirmed that the plunger impacts at the seat caused the objectionable buzz noise. After a systematic investigation, noise issue was resolved by changing the design of the oil pressure regulator spring. Mechanical development tests confirmed the transparency of the new oil pressure regulator spring, which was later implemented in production.
Experimental Investigation of the Oil Pressure Regulator Buzz Noise on Diesel Engines
Sae Technical Papers
SAE 2013 Noise and Vibration Conference and Exhibition ; 2013
13.05.2013
Aufsatz (Konferenz)
Englisch
Experimental Investigation of the Oil Pressure Regulator Buzz Noise on Diesel Engines
British Library Conference Proceedings | 2013
|Suppressing buzz-saw noise in jet engines
NTRS | 1980
|Experimental investigation of diesel engines
TIBKAT | 2001
|The future's a buzz Diesel electronics
Kraftfahrwesen | 1989
|"Buzz-saw" noise: Prediction of the rotor-alone pressure field
Tema Archiv | 2012
|