The New 2.7L Turbo Engine from General Motors

Authors

B. Lehman, K. Luchansky, C. Mariott, S. Shin,
General Motors, Pontiac, USA

Year

2019

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 811

Summary

An all new gasoline engine has been developed for use in the General Motors’ Full-Size Truck, light duty line up. There are six core efficiency building blocks which have been employed to deliver segment leading CO₂ emissions and drivability performance.
The core CO₂ enabling technologies are:
• Advanced high charge motion combustion system enabling 22 bar BMEP on
91 RON fuel
• Integrated Exhaust Manifold (IEM) and Dual-Volute turbo charger producing
peak torque starting at 1,500 RPM
• Significant light weighting resulting in leading edge mass vs engine displacement
• Low friction enabling technology including a fully variable oil pump, offset bores and other “Efficient Fundamentals”
• Advanced active thermal management with split targeted cooling
• tripower multi-discrete-variable valve lift system enabling Early Intake Valve Closure (EIVC), cylinder deactivation and high lift states
These technologies complement each other, delivering both on cycle and real-world CO₂ emissions reductions, as well as customer-focused torque response needed in this demanding application. Moreover, much attention was placed on increasing customers’ expectations of drivability and transient response.
In this paper, the engine’s architecture, mechanical design, and integration of these core CO₂ enabling technologies will be described. The control of each subsystem including actuators, and sensors will be explained to show how these systems are implemented.
Finally, an evaluation of customer benefits will be explained.