The US engine market is unique. The vast majority of engines in service in North America, nearly 75 %, have six or eight cylinders. Furthermore, the preferred valvetrain architecture for most high displacement, high horsepower engines is the cam in block, or pushrod, type valvetrain. These types of high power density engines operate under part load during normal driving conditions. An opportunity to leverage this fact to improve fuel economy in these types of engines by selectively deactivating the engine's cylinders during steady-state operation was seized upon. This paper covers the design and development of the Multi-displacement System (MDS) cylinder deactivation feature on the DaimlerChrysler 5.7L HEMI engine. Design, layout and operation of the engine hardware are discussed in detail, describing the following issues: - engine hardware, - oil control solenoid details, - engine hardware operation, - operating parameters, - development of the engine hardware, - torque matching, - torque during transitions, - algorithm and calibration verification, - vehicle integration, - engine mounting, - exhaust and induction system, - fuel economy. The integration of cylinder deactivation into the engine architecture minimizes the cost and complexity while increasing reliability. Improvements in mass production manufacturing precision have lowered the cost and increased the reliability of the engine hardware.
Features and development of the DaimlerChrysler 5.7 l HEMI engine multi-displacement system
Funktion und Entwicklung des DaimlerChrysler 5.7 l HEMI Motors mit dem Zylinderabschaltung
2005
20 Seiten, 18 Bilder, 4 Quellen
Conference paper
English
Features and Development of the DaimlerChrysler 5.71 HEMI® Engine Multi-Displacement System
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