Abstract
Cylinder deactivation is a fuel economy improvement technology that has attracted particular attention recently. The currently produced cylinder deactivation engines utilize fixed-type cylinder deactivation in which only a fixed number of cylinders are deactivated. As fixed-type cylinder deactivation has some shortcomings, variable-type cylinder deactivation with no limit on the number of deactivated cylinders is under research. For variable-type cylinder deactivation, control is more complicated and production cost is higher than fixed-type cylinder deactivation. Therefore, it is necessary to select the cylinder deactivation control method considering both advantages and disadvantages of the two control methods. In this study, a fuel economy prediction simulation model was created using the measurement data of various vehicles with engine displacements of 1.0–5.0 L. The fuel economy improvement of fixed-type cylinder deactivation was compared with that of variable-type cylinder deactivation using the created simulation. As a result of examining the fuel economy improvement of the test vehicle in the FTP-75 driving cycle, the improvement was 2.2–10.0% for fixed-type cylinder deactivation and 2.2–12.8% for variable-type cylinder deactivation. Furthermore, the effect of the engine load on fuel economy improvement under cylinder deactivation and the effect of changes in engine control were examined via a simulation.
Highlights
Fuel economy improvement technologies have been studied actively and applied to vehicles to address problems such as fossil fuel depletion and greenhouse gas regulations [1,2,3,4,5]
In this study, fixed-type and variable-type cylinder deactivation fuel economy simulations were performed for the test vehicles, and the fuel economy improvement depending on the cylinder deactivation method were compared using the obtained indicated mean effective pressure (IMEP), pumping mean effective pressure (PMEP), manifold absolute pressure (MAP), and fuel
The expected fuel economy improvement of fixed-type and variable-type cylinder deactivation were compared for each vehicle, and the influences of variables that may occur depending on the vehicle application and the causes were investigated
Summary
Fuel economy improvement technologies have been studied actively and applied to vehicles to address problems such as fossil fuel depletion and greenhouse gas regulations [1,2,3,4,5] Among such technologies, cylinder deactivation has attracted particular attention recently. 8-cylinder variable-type cylinder deactivation can deactivate 1–7 cylinders depending on the operating conditions to maximize the fuel economy improvement [25]. While variable-type cylinder deactivation technology has a larger fuel economy improvement than the fixed-type method, its control logic is more complicated and the production cost is higher due to the increase in the operating unit. Fuel economy prediction simulation on cylinder deactivation was performed in previous studies [16,18,26], the control method was limited to the fixed type and studies on predicting fuel economy for the variable-type control are not available. Other than the fuel economy depending on the control method, various influence factors affecting cylinder deactivation were derived and their influences were identified
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