Abstract
Utilizing exhaust-gas heat can be effective to improve the overall thermal efficiency of engine vehicles. However, the exhaust-gas heat and temperature at light loads may be insufficient for some exhaust-gas heat recovery systems. Exhaust-gas heat is largely influenced by the combustion phase, and a retardation of spark timing could increase exhaust-gas heat considerably. The current work evaluates the effect of a large retardation of spark-ignition timing on the exhaust-gas temperature and heat at steady operating conditions and at vehicle driving mode conditions. The relationships between the exhaust heat and thermal efficiency factors such as cooling-loss fraction, degree of constant volume, and pumping-loss fraction are also analysed in detail. The results show that a combination of spark retardation and intake throttle opening can increase exhaust-gas heat with minimum deteriorations in engine efficiency. The minimum deterioration in efficiency is attributed to reductions in cooling and pumping losses, while the degree of constant volume is decreased by the retarded combustion phase.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
