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Engine start/stop vibrations in truck
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Vibrationer vid start/stopp av lastbilsmotor (Swedish)
Abstract [sv]

De vibrationer som uppkommer under start och stopp av motor i en lastbil är inte ett problem för den vanlige lastbilschauffören. Men när bränslesparande system och hybrida drivlinor blir allt vanligare på marknaden kommer vibrationskomforten under dessa vibrationer bli allt viktigare för förarmiljön. Speciellt för lastbilar i distributionstrafik och bussar.

Olika parametrar som är av intresse under mätning av lastbilsmotorns start- och stopsekvens har undersökts och en mätmetod tillsammans med en analysmetod har föreslagits. En studie inkluderande 13 erfarna lastbilschaufförer och provningsingenjörer har genomförts med syftet att hitta samband mellan testpersonernas subjektiva uppfattning av dessa vibrationer och olika parametrar i mätdata.

Resultatet av studien påvisar att vibrationerna under motor avstängning upplevs som mer besvärande än under start av motorn. Studien pekar också emot att vibrationslängd kan ha en större inverkan på vibrationskomfort än maxacceleration. Ett förslag till acceptanskriterium har också föreslagits.

Abstract [en]

The vibration comfort during engine start and stop in a truck is not a problem for the typical truck driver. But when fuel saving systems and hybrid power trains are becoming more common on the market, the aspect of driveability and vibration comfort regarding this load case will become more important, especially in distribution trucks and busses.

Different parameters that are of interest during measurement of engine start and stop vibrations have been investigated and a measurement method along with an analysis method has been proposed. A study including 13 experienced truck drivers and test engineers was made with the purpose to find correlation between their subjective judgment and different parameters in the measurement data regarding the vibrations during engine start and stop.

The result of the study indicates that the vibrations during engine stop perceives as worse compared to vibrations during engine start. It was also found that the vibration duration may have a bigger impact on subjective judgement than the peak acceleration. Based on the study, a proposal to criterion of acceptance has been established.

Place, publisher, year, edition, pages
2014. , 62 p.
Series
MMK 2014:52 MDA 470
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-168849OAI: oai:DiVA.org:kth-168849DiVA: diva2:818734
Supervisors
Examiners
Available from: 2015-11-25 Created: 2015-06-09 Last updated: 2015-11-25Bibliographically approved

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