Cooling system improvements - assessing the effects on emissions and fuel economy

Chris J Brace, J Gary Hawley, Sam Akehurst, Mitchell Piddock, I Pegg

Research output: Contribution to journalArticlepeer-review

37 Citations (SciVal)


The work reported in this paper details an experimental study of the effects of cooling system hardware changes on diesel engine emissions and fuel economy. Experiments were performed under both steady state and transient conditions and complemented by statistical assessments. Techniques for assessing the thermal integrity of the engine as a consequence of such changes are also presented. An experimental design was constructed to investigate the effect of water pump throttling, coolant flow control through the oil cooler, and the adoption of a pressure resistive thermostat (PRT). Use of these thermal controls offers a useful trade-off between NOx and fuel economy, with a saving of around 3 per cent in b.s.f.c. for a 10 per cent NOx penalty at low load, where NOx output is less of a concern. However, these benefits were not observed during drive cycle testing
Original languageEnglish
Pages (from-to)579-591
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Issue number4
Publication statusPublished - 1 Apr 2008


  • Flow control
  • Emission control
  • Coolants
  • Thermostats
  • Diesel engines
  • Cooling systems
  • Fuel economy


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