Monte Carlo Simulation of Cycle by Cycle Variability

Effect of Ethanol on Part Load Thermal Efficiency and CO 2 Emissions of SI Engines

Perspectives on Applications of Variable Valve Timing

An intake port pressure control system comprises an intake passage leading to a cylinder in an engine, and a check valve in the intake passage to allow fluid flow toward the cylinder and obstruct fluid back-flow in the reverse direction. A bypass port is located on the intake passage so that the bypass port communicates with a trapped volume defined by the portion of the intake passage between the check valve and intake valve. The intake port pressure control system further comprises a control valve having an outlet passage, a secondary passage, and an actuator enabling communication between the outlet passage and secondary passage. The actuator further enables active adjustment of the flow area of the flowpath between the secondary passage and outlet passage throughout a range of engine operating conditions. The outlet passage is connected to the bypass port, and the secondary passage is connected to a secondary air source. The control valve enables a controlled air flow therein between the secondary air source and the trapped volume when the intake valve is closed.

Intake port pressure control system for engine induction system

This paper details the use of the Modelica modeling language for the cycle simulation of a spark-ignited engine. After a brief overview of the physical processes which must be modeled by a predictive cycle simulation model, this work emphasizes the two main challenges to the developer of such a model in Modelica: zone formation/destruction and calculation of realistic thermodynamic properties of the cylinder contents. The results illustrate that Modelica is capable of handling the complex physical models required by cycle simulation programs.

/pdf/spark-ignited-engine-cycle-simulation-in-modelica-3b443bmd6p.pdf

Spark-Ignited-Engine Cycle Simulation in Modelica

This paper describes an experimental and analytical study conducted to investigate the effects of load control with port throttling on stability and fuel consumption at idle. With port throttling, the pressure in the intake port increases during the valve-closed period due to flow past the throttle. If the pressure in the port recovers to ambient before the valve overlap period, back flow into the intake system from the cylinder is eliminated. This allows increased valve overlap to be used without increasing the residual mass fraction in the cylinder.

The Effects of Load Control with Port Throttling at Idle- Measurements and Analyses

The effects of load control with port throttling at idle

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The Effects of Load Control with Port Throttling at Idle- Measurements and Analyses

The effects of load control with port throttling at idle