WHEN SWITCHING-OFF THE ENGINE IS WORTHWHILE

WANN SICH MOTORABSTELLEN LOHNT

The fundamental results from this investigation have shown that switching off the engine during periods when a vehicle is stationary should lead to an improvement in fuel consumption and in the emission of Co. The improvement for CO is on average 11% and for fuel consumption 11.5%. The reduction in pb-emission is directly proportional to the reduction in fuel consumption. The test results do not provide any expectation of an improvement in ch emission by switching off the engine. In this case, however, as was established in previous investigations, the introduction of an electro-magnetic slow running jet was shown to have a positive influence. It was also shown that no improvement could be expected by this measure in the emission of no. It must however be taken into consideration that the absolute emission of no in these operating conditions is very small due to the low combustion temperatures. With reference to diesel engines the tests show that on the basis of the europa-tests, only an improvement in fuel consumption is possible: correspondingly a reduction results in the emission of so2. In judging these results consideration must also be given to certain related questions such as increased noise when starting, maintenance of traffic flow by reliable starting, increased stress on the part of drivers due to switching off and re-starting and legal details. Furthermore account must be taken of the increased wear and tear on the electrical components and on the engine itself due to the repeated starting. Since the results described here were based on idling- and starting-times in the Kaiserslautern region, only a qualified transfer of the results for use in other large towns and conurbations is possible. (TRRL)

• Authors:
  • May, H
  • Dreyhaupt, F J
  • Kleinert, G
• Publication Date: 1978-9

Language

• German

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 351-353
• Serial:
  • Umwelt
  • Volume: 8
  • Issue Number: 5
  • Publisher: VDI Nachrichten

Subject/Index Terms

• TRT Terms: Carbon monoxide; Diesel engines; Energy conservation; Engine idling; Environment; Environmental impacts; Exhaust gases; Fuel consumption; Hydrocarbons; Ignition; Lead (Metal); Motors; Nitrogen; Starting (Driving); Sulfur; Sulfur dioxide; Switching; Tests; Vehicle power plants; Vehicles
• Uncontrolled Terms: Decreases; Starting
• Old TRIS Terms: Automobile engines; Idling
• ITRD Terms: 7391: Carbon monoxide; 9009: Decrease; 1314: Diesel engine; 212: Energy conservation; 232: Fuel consumption; 7367: Hydrocarbon; 1808: Idling (engine); 1327: Ignition; 1334: Motor; 6255: Test; 1255: Vehicle
• Subject Areas: Energy; Environment; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00330706
• Record Type: Publication
• Source Agency: Bundesanstalt für Straßenwesen (BASt)
• Files: ITRD, TRIS
• Created Date: May 21 1981 12:00AM