The New 1.5L Turbo Engine from General Motors

Authors

C. Marriott, A. Predoehl, I. Stahl, J. Velosa, General Motors, Warren, USA:

Year

2022

Print Info

Production/Publication ÖVK

Summary

An all-new gasoline engine family has been developed by General Motors (GM) for the China market. The lead engine was designed to be the highest power density mass- produced four-cylinder by GM, with a power density of 100 kW/L. The engine family offerings will cover diverse vehicle applications with the first engine designed to be a segment leader in power and mass. There are seven core efficiency building blocks that were employed to deliver optimum performance, minimizing mass and cost, optimizing fuel consumption, and meeting the stringent China 6b Final RDE requirements.

The core enabling technologies are:

• Advanced combustion system with leading edge Turbulent Kinetic Energy (TKE) vs flow coefficient at a compression ratio of 10:1, enabling 22.7 bar BMEP on 91 RON fuel.
• Torque-actuated fast cam phasers with recirculation feature and central magnet control to improve transient response and fuel consumption.
• Engine-mounted liquid charge air cooler (CAC) for improved performance and reliability.
• Advanced active thermal management (ATM) with split targeted cooling.
• Unique precision sand cast (PSC) block design with inter-bore cooling. Integrated ventilation and ATM cooling systems result in leading edge mass vs. engine displacement.
• Integrated exhaust manifold (IEM) coupled to a single scroll and electric wastegate turbocharger with optimized compressor and turbine efficiencies to produce peak torque starting at 1,750 RPM.
• Low friction enabling technology including a fully variable oil pump, offset bores, and other “Efficient Fundamentals”.

These technologies complement each other, delivering best-in-class performance, both on- cycle and real-world CO₂-emission reduction, as well as customer-focused torque response and power in this demanding environment. Moreover, much attention was placed on meeting customer expectations of great drivability, performance, NVH refinement and transient response.

In this paper, the engine’s architecture, mechanical design, and integration of these core technologies is described. The control of each subsystem, including actuators and sensors, is explained to show how these systems are implemented. Finally, an evaluation of customer benefits is also explained.

ISBN

1920-2323-23-1

Number of pages

23 Order