All of these factors however, result in higher friction and pumping loss
penalties than will be measured on optimized and customized production OP engines.
Youssef Ismail et al [14, 15] investigated the influence of turbo-compounding system upon combustion, pumping work, exhaust gas recirculation (EGR) rate and engine thermal balance, showing that pumping loss is the main influence exerting on engine by power turbine.
1], the second one is the pumping loss of the engine in CMTC system, denote it as [chi.
Low inertia and high-output mono-scroll turbocharger coupled with electric waste gate (enabling highly flexible boost pressure control) improve boost response and contribute to higher fuel efficiency by reducing pumping loss
The inlet valves are held open longer than normal to allow a reverse flow of intake air into the intake manifold, thereby decreasing pumping loss
and increasing thermal efficiency.
This causes pumping loss
, and it is the single most important reason why spark engines are less efficient than diesels.
3 via a thorough reduction of mechanical friction and pumping loss
and praises it as an example of the future of ultra-efficient gasoline engines.
The Atkinson cycle engine delays intake and compression timing to generate a high expansion ratio with low compression, thereby limiting pumping loss
It can be seen that the baseline torque, lambda and EGR targets could be achieved with both technologies, except for the lambda target at the 600 rpm operating point due to the tradeoff between an increase in pumping loss
versus an increase in turbine power output.
Furthermore, the improvement of pumping loss reaches up to 12.
Especially in the part load, the thermal efficiency of gasoline engine is much less than diesel engine because of different throttle opening that will affect pumping loss .
The pumping loss
is far less than the friction losses eliminated by the new pin design.