Analysis and Modeling of an Electronically Controlled Pneumatic Hydraulic Valve for an Automotive Engine 2006-01-0042
This paper addresses the design and detailed modeling of a novel electronically controlled, pneumatic/hydraulic valve actuator (EPVA) for both the engine intake and engine exhaust valves. The valve actuator's main function is to provide variable valve timing and variable lift in an automotive engine. The design of the combination of pneumatic and hydraulic mechanisms allows the system to operate under low pressure with an energy saving mode. A system dynamics analysis is provided and is followed by a mathematical model. This modeling approach uses the Newton's law, mass conservation and thermodynamic principles. The air compressibility and liquid compressibility in the hydraulic latch are modeled. The discontinuous nonlinearity of the compressible flow due to choking is carefully considered. Provision is made for the nonlinear motion of the mechanical components due to the physical constraints. Validation experiments were performed on a Ford 5.4 liter 4-valve V8 engine head with different air supply pressures and different solenoid pulse inputs. Results of the experiments were satisfactory and the simulation responses agreed with the experimental results.
Citation: Ma, J., Schock, H., Carlson, U., Hoglund, A. et al., "Analysis and Modeling of an Electronically Controlled Pneumatic Hydraulic Valve for an Automotive Engine," SAE Technical Paper 2006-01-0042, 2006, https://doi.org/10.4271/2006-01-0042. Download Citation
Author(s):
Jia Ma, Harold Schock, Urban Carlson, Anders Hoglund, Mats Hedman
Affiliated:
Michigan State University, Automotive Research Experiment Station, Cargine Engineering AB
Pages: 14
Event:
SAE 2006 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Variable Valve Actuation 2006-SP-2007
Related Topics:
Variable valve timing
Mathematical models
Exhaust valves
Energy conservation
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »