Vehicle Demonstration of 2 Stroke Engine Brake in a Heavy Duty Truck 2016-01-8061
Heavy duty valvetrains have evolved over the last 20 years with the integration of engine braking into the valvetrain. Jacobs Vehicle Systems have developed the High Power Density (HPD) engine brake that increases retarding powe, especially at low engine speed. The system works by converting the engine from a 4 stroke during positive power into a 2 stroke for retarding power. This more than doubles the retarding power at cruise engine speeds reducing the need to downshift in order to control the vehicle, compensates for reduction in natural vehicle retarding due to aerodynamic and friction enhancements, and enables the same vehicle retarding power with a smaller displacement engine as engine downsizing becomes prevalent. This paper describes lessons learnt during a recent vehicle demonstration project undertaken by Jacobs including performance, durability, integration with the engine powertrain, controls development, calibration, management of air system and transient operation.
Citation: Howell, T., Swanbon, B., Baltrucki, J., Steines, A. et al., "Vehicle Demonstration of 2 Stroke Engine Brake in a Heavy Duty Truck," SAE Int. J. Commer. Veh. 9(2):260-269, 2016, https://doi.org/10.4271/2016-01-8061. Download Citation
Author(s):
Thomas Howell, Bruce Swanbon, Justin Baltrucki, Alan Steines, Nancy Neff, Biao Lu
Affiliated:
Jacobs Vehicle Systems Inc.
Pages: 10
Event:
SAE 2016 Commercial Vehicle Engineering Congress
ISSN:
1946-391X
e-ISSN:
1946-3928
Also in:
SAE International Journal of Commercial Vehicles-V125-2EJ, SAE International Journal of Commercial Vehicles-V125-2
Related Topics:
Downsizing
Aerodynamics
Calibration
Durability
Powertrains
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