In order to improve the fuel economy of a heavy duty diesel engine at low speed and high load

study on the optimization strategy of intake air system and fuel injection parameters was carried out on a two-stage variable geometry turbocharged heavy duty diesel engine. Results show that in the case of limiting the maximum burst pressure in the cylinder

the turbocharger vane can be adjusted to achieve the lowest fuel consumption only when the pumping loss is substantially zero. Moreover

choosing a right injection pressure can increase mechanical efficiency and improve fuel economy

while reducing NOx emissions and keeping soot emissions low. Based on the optimization strategy proposed in the above study

the influence of maximum burst pressure in the cylinder on the fuel economy under different operating conditions was studied

and the potential of increasing maximum burst pressure in the cylinder to improve fuel economy was further explored. Results show that as speed and load increase

the advantage of increasing the maximum burst pressure limit is more obvious for improving fuel economy. However

after the maximum burst pressure is increased to a certain extent

its effect on improving fuel economy will gradually decrease.