Potentials of a Piezo-Driven Passenger Car Common Rail System to Meet Future Emission Legislations - An Evaluation by Means of In-Cylinder Analysis of Injection and Combustion

Fettes, C.; Leipertz, Alfred

doi:10.4271/2001-01-3499

Cited by 29 publications

(10 citation statements)

References 3 publications

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“…This chapter contains the results of the fuel injection system measurements within an optically accessible engine and the comparison between the computed and measured parameters. All measurements were carried out within an single-cylinder transparent engine based on the AUDI V6 engine, equipped with a Bosch Common Rail Injection System [7] [8]. We used a BOSCH DLLA 6 HD 360 6-holes mini-sac-hole nozzle with a flow value μ = 0.77.…”

Section: Comparison Between Measured and Calculated Valuesmentioning

confidence: 99%

Mathematical Model for the Injector of a Common Rail Fuel-Injection System

Marčič¹,

Marčič

Praunseis³

2015

ENG

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The paper describes a Diesel fuel injection process. Computer simulation was carried out together with measurement of the Common Rail accumulator fuel-injection system. The computer simulation enables the observation of the phenomena from rail pressure, being the input data for injection parameters calculations, to the injection rate. By means of computer simulation, the pressure values in specific sections of the injection nozzle may be computed, the needle lift, injection rate, total injected fuel, time lag from injector current to first evidence of injection process and other time-lags between various phases of the injection process. The injection rate provides input data for spray computer simulation. Measurements of injection and combustion were carried out within a transparent research engine. This engine is a single-cylinder transparent engine based on the AUDI V6 engine, equipped with a Bosch Common Rail Injection System. The comparison between the computed and measured injection parameters showed good matching.

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Section: Comparison Between Measured and Calculated Valuesmentioning

confidence: 99%

Mathematical Model for the Injector of a Common Rail Fuel-Injection System

Marčič¹,

Marčič

Praunseis³

2015

ENG

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“…In this regard, a major role is played by diesel injectors, which are one of the core components of CR systems [8,9]. Two main driving technologies exist to control the needle lift, and diesel injectors can thus be classified into solenoid- [10,11] or piezoelectric-driven [12,13]. In this latter category, it is possible to further distinguish between directand indirect-acting piezo injectors.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Emissions, Noise, and Fuel Consumption Comparison of Direct and Indirect Piezoelectric and Solenoid Injectors in a Low-Compression-Ratio Diesel Engine

et al. 2019

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An experimental investigation has been carried out to compare the performance and emissions of a low-compression-ratio Euro 5 diesel engine featuring high EGR rates, equipped with different injector technologies, i.e., solenoid, indirect-acting, and direct-acting piezoelectric. The comparisons, performed with reference to a state-of-the-art double fuel injection calibration, i.e., pilot-Main (pM), are presented in terms of engine-out exhaust emissions, combustion noise (CN), and fuel consumption, at low–medium engine speeds and loads. The differences in engine performance and emissions of the solenoidal, indirect-acting, and direct-acting piezoelectric injector setups have been found on the basis of experimental results to mainly depend on the specific features of their hydraulic circuits rather than on the considered injector driving system.

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“…Also, the needle speed of a piezo injector is faster than that of a solenoid injector, so it leads accurate opening and closing of the needle and produces more injections per engine cycle. Another says a piezo injector consumes less power and requires lower current than a solenoid injector since a solenoid injector is operated by peak and hold method, which needs boosted high operating current for fast response [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effects of hydraulic flow and spray characteristics on diesel combustion in CR direct-injection engine with indirect acting Piezo injector

Chung

Kim

et al. 2015

J Mech Sci Technol

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Recently, the automobile industry has focused on the FIE system of diesel engine with common-rail, EGR, and turbo charger in order to meet a more stringent emission and fuel economy regulations. High-pressure fuel direct injection by using common-rail system is widely accepted because diesel combustion and emission characteristics highly depend on the formation of air-fuel mixture quality. By this fact, an electro-hydraulic injector for common-rail fuel injection system should be designed to have precise and fast response of injector needle's opening and closing behavior to enhance air-fuel mixing rate. As know, most electro-hydraulic injectors provide its nozzle movement by solenoid coil energy or piezo-actuation. Relatively, servo-hydraulic type piezo injector with bypass-circuit mechanism, which it serve to amplify extension of the piezo stack, is also known for their good efficiency. So the piezo actuator triggers pilot valve for controlling pressure balance, which is accurately regulated by bypass-circuit system. Therefore, main actuation force of piezo injector to move injector needle is hydraulic, which is the key object as it is aimed towards all this research ranges: numerical and experimental approaches. In this study, firstly a full-circuit numerical model of an indirect acting piezo injector with bypass-circuit by using AMESim code has been developed to predict dynamic characteristics of hydraulic components and verified by comparison with experimental data. Also, two experiment schemes were carried out using a constant volume chamber with LED back-illumination system for Mie scattering and a single-cylinder CR direct-injection engine, equipped with a bypass-circuit type piezo and solenoid injector to compare high-speed spray and combustion characteristics in this study because spray penetration and duration are key factor in diesel diffusion combustion. As main results obtained by this study, the injection flow rate and injector internal pressure dynamics calculated by AMESim environment of a bypass type piezo-driven injector reasonably agreed with the experimental result. Also it has better capability in controlling injector needle closing delay and a beneficial effect on diesel diffusion combustion.

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Potentials of a Piezo-Driven Passenger Car Common Rail System to Meet Future Emission Legislations - An Evaluation by Means of In-Cylinder Analysis of Injection and Combustion

Cited by 29 publications

References 3 publications

Mathematical Model for the Injector of a Common Rail Fuel-Injection System

Mathematical Model for the Injector of a Common Rail Fuel-Injection System

Comparison of the Emissions, Noise, and Fuel Consumption Comparison of Direct and Indirect Piezoelectric and Solenoid Injectors in a Low-Compression-Ratio Diesel Engine

Effects of hydraulic flow and spray characteristics on diesel combustion in CR direct-injection engine with indirect acting Piezo injector

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