Advanced Functional Pulse Testing of a Two-Stage VCR-System

Jesser, Markus; Orlowsky, Kolja; Pischinger, Stefan

doi:10.4271/2019-01-1195

Cited by 1 publication

(2 citation statements)

References 4 publications

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“…[22][23][24] So far, the validation process of this models has been based primarily on off-engine test results, for example, from component tests or the Advanced Functional Pulse Test (AFPT). 25,26 Special influences resulting from the fired engine operation therefore could not be sufficiently considered in the development process, so that the engine testing is indispensable for a consistent validation process of the existing simulation approaches. Examples of influencing factors resulting from the fired engine operation are: Dynamic oil pressure stimulation of the conrod oil supply.…”

Section: Design Process Of Conrod Based Two-stage Vcr Systemsmentioning

confidence: 99%

“…Since no commercially available pressure transmitter sufficiently fulfills both requirements, special in-house developed high pressure sensors were used (see Figure 5, left). 25 Special transducer strain gauge rosettes were applied to a sensor membrane, which is designed for the required measuring range. The elastic deformation of the sensor membrane induced by the oil pressure is detected by the strain gauge rosette.…”

Section: Measurement Technique and Test Boundary Conditionsmentioning

confidence: 99%

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Experimental analysis of the system behavior of a two-stage variable compression ratio (VCR) system in fired SI-engine operation

Hammermueller

Orlowsky

Hanciogullari

et al. 2021

International Journal of Engine Research

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Especially for turbocharged SI engines, systems that allow to adapt the geometrical compression ratio offer advantages in terms of part load efficiency and maximum power output. In this study a conrod based two-stage VCR system with an eccentric piston pin bearing is investigated in fired engine operation by means of a specially designed measurement technique. For this purpose different sensor technologies were equipped to a VCR conrod and the oil supply system of a prototype crankshaft. The data transmission was realized by an optimized mechanical linkage system and a digital rotation telemetry system. The high-performance measurement technique presented in this paper enables a detailed analysis of the influencing parameters resulting from the fired engine operation, such as dynamic pressure stimulation in the crankshaft oil supply or the acceleration of the internal oil columns. The presented crank angle based measurement results of the system are obtained through fired testbench investigations on a three-cylinder full engine in the entire engine map, focusing on the speed range up to [Formula: see text] and loads up to [Formula: see text]. A detailed analysis of the conrod system behavior in high and low compression ratio is shown. A key finding is, that the so called “hydraulic pretension” of the support chamber is necessary to meet the requirements for a stiff force transmission in the low compression ratio stage. The in-depth investigation contributes to the build up of a comprehensive system understanding and represents a solid base to expand the development process of conrod based two-stage VCR systems.

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Section: Design Process Of Conrod Based Two-stage Vcr Systemsmentioning

confidence: 99%

Section: Measurement Technique and Test Boundary Conditionsmentioning

confidence: 99%