Technology

2019 Chevrolet Silverado gets 17 modes of cylinder deactivation

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The 2019 Silverado’s V8 gasoline engines get ‘Dynamic Fuel Management’ which Chevrolet claims to be the segment-first technology.

Unlike the conventional cylinder deactivation technology which deactivates 4 out of 8 cylinders for example, the Dynamic Fuel Management (DFM) features 17 cylinder patterns.

DFM is powered by a sophisticated controller that continuously monitors every movement of the accelerator pedal and runs a complex sequence of calculations to determine how many cylinders are required to meet the driver’s requested torque. It can make this decision 80 times per second.

“Dynamic Fuel Management enables only the cylinders needed to deliver the power you want, seamlessly delivering the best balance of power and fuel economy,” said Jordan Lee, Small Block chief engineer.

An electromechanical system deactivates and reactivates all 16 of the engine’s hydraulic valve lifters, controlling the valve actuation. The system uses solenoids to deliver oil pressure to control ports in the lifters, which activate and deactivate the lifters’ latching mechanisms.

When a cylinder is deactivated, the two-piece lifters effectively collapse on themselves to prevent them from opening the valves. When the cylinder is reactivated, solenoids send an oil pressure signal to the control ports on the lifters and the latching mechanism restores normal function, allowing the valves to open and close.

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During an industry-standard test schedule, the 2019 Silverado 2WD with the 5.3L and DFM operated with fewer than eight active cylinders more than 60 percent of the time, 9 percent more than a comparably equipped 2018 model with AFM (Active Fuel Management / conventional cylinder deactivation), Chevrolet said.

“The increased variability of Dynamic Fuel Management means the engine will operate more often with a reduced number of cylinders, which saves fuel across the board,” said Lee. “Better yet, the transitions are transparent, and because the system is torque-based, you’ve always got that satisfying feeling of power on demand that comes from Chevy’s Gen V Small Block V-8 engines.”

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The 5.3L V8 gasoline delivers 355 hp @ 5600 rpm and 519 Nm of torque @ 4100 rpm, paired to a Hydra-Matic 8-speed automatic transmission. There is also a 6.2L V8 gasoline delivering 420 hp @ 5600 rpm and 621 Nm of torque @ 4100 rpm, paired to a Hydra-Matic 10-speed automatic transmission.

Both transmissions feature enhancements designed to improve shift quality, as well as a new centrifugal pendulum absorber torque converter that reduces vibrations to improve smoothness, particularly during cylinder deactivation events, Chevrolet said.

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The engines also feature driver-selectable stop/start technology that helps save fuel in stop-and-go traffic.

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