Load point shifting for Diesel engines – potentials for passenger car and truck engine applications

Neugärtner, Jörg; Beigl, Michael; Schurr, Anton; Guenthner, Michael; Flierl, Rudolf

doi:10.1007/978-3-658-17109-4_6

Cited by 5 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Either a fully variable valve train or switchable cams are required to implement this measure. [12][13] 5. Early Exhaust Opening: With early exhaust valve timing, the exhaust valve is opened at elevated cylinder pressure and gas temperature.…”

Section: Methods For Increasing Exhaust Gas Temperaturementioning

confidence: 99%

See 1 more Smart Citation

Thermal Management Concept for the Exhaust Aftertreatment of Commercial Vehicle Diesel Engines Using Variable Mixtures of Diesel Fuel and Rapeseed Oil

Thees¹,

Guenthner²,

Mueller³

2021

SAE Technical Paper Series

View full text Add to dashboard Cite

The use of vegetable oil as a fuel for agricultural and forestry vehicles allows a CO2 reduction of up to 60 %. On the other hand, the availability of vegetable oil is limited, and price competitiveness depends heavily on the respective oil price. In order to reduce the dependence on the availability of specific fuels, the joint research project "MuSt5-Trak" (Multi-Fuel EU Stage 5 Tractor) aims at developing a prototype tractor capable of running on arbitrary mixtures of diesel and rapeseed oil.Depending on the fuel mixture used, the engine parameters need to be adapted to the respective operating conditions. For this purpose, it is necessary to detect the composition of the fuel mixture and the fuel quality. Regardless of the available fuel mixture, all functions for regular engine operation must be maintained. A conventional active regeneration of the diesel particulate filter (DPF) cannot be carried out because rapeseed oil has a flash point of 230°C, compared to 80°C for diesel fuel. This leads to a condensation of rapeseed oil while using post-injection at low and medium part load operating points, which causes a dilution of the engine oil.In this work, engine-internal measures for achieving DPF regeneration with rapeseed oil and mixtures of diesel fuel and rapeseed oil are investigated. In order to provide stationary operating conditions in real engine operation, a "high-idle" operating point is chosen. The fuel mixtures are examined with regard to compatibility concerning a reduction of the air-fuel ratio, late combustion phasing and multiple injections. The highest temperatures are expected from a combination of these control options. After the completion of a regeneration cycle, the fuel input into the engine oil is controlled. These investigations will serve as a basis for the subsequent development of more complex regeneration strategies for close-toreality engine operating cycles with varying load conditions.

show abstract

Section: Methods For Increasing Exhaust Gas Temperaturementioning

confidence: 99%

“…Figure4: Change of exhaust gas temperature and brake specific fuel consumption for cylinder deactivation, throttling, early exhaust valve opening and post injection (data taken from[12])…”

mentioning

confidence: 99%

Thermal Management Concept for the Exhaust Aftertreatment of Commercial Vehicle Diesel Engines Using Variable Mixtures of Diesel Fuel and Rapeseed Oil

Thees¹,

Guenthner²,

Mueller³

2021

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…While one cylinder is deactivated, the remaining three cylinders undergo a load point shift to provide the same effective power to the engine. Although the internal cylinder temperature increases, wall heat transfer will effectively be reduced due to the reduced surface available for wall heat transfer in three instead of four cylinders [4,5].…”

Section: Engine Concept "Hdmk"mentioning

confidence: 99%

High Efficiency Diesel Engine Concept With Variable Valve Train and Cylinder Deactivation for Integration Into a Tractor

Thees

Buitkamp

Guenthner

et al. 2019

ASME 2019 Internal Combustion Engine Division Fall Technical Conference

View full text Add to dashboard Cite

The objective of current research on internal combustion engines is to further reduce exhaust emissions while simultaneously reducing fuel consumption. The resulting measures often mean an increase in complexity of internal combustion engines, which on one hand increases production cost and on the other hand increases the susceptibility of the overall system to defects. It is therefore necessary to develop technologies which can generate an advantage for the consumer despite increasing complexity. Within the scope of the project “High Efficiency Diesel Engine Concept” (“Hocheffizientes Diesel-Motoren-Konzept” HDMK), funded by the Federal Ministry of Economic Affairs and Energy with TÜV Rheinland as project management organization (funding code: 19U15003A), two engine concepts were investigated and combined on a John Deere four-cylinder inline engine. On the one hand, a new cylinder activation concept (“3/4-cylinder concept”) was implemented with the aim of reducing fuel consumption. On the other hand, a fully variable valve train was developed for this engine, which both improves the functionality of the 3/4-cylinder concept and can have a positive influence on exhaust emissions through internal exhaust gas recirculation. A comparison of this engine concept with its series reference based on measurement data showed a fuel economy advantage of up to 5.2% in the low load field cycles of the DLG PowerMix. The maximum fuel consumption benefit in the low load engine regime exceeded 15% in some of the operating points. As a final step, the engine was modified for the integration into an existing and working tractor, maintaining the available installation space of the powertrain.

show abstract

“…By regulating the intake valve, the goal is to minimize the stroke volume rather than the fusion charge. These inactive cylinders also serve as an "air spring," performing compression and expansion cycles on a regular basis [1]. As a result, CDA is also thought to be an effective way for reducing pumping losses during part load conditions, quire driving torque.…”

Section: Introductionmentioning

confidence: 99%

Cylinder deactivation technique in multi-cylinder engines for fuel consumption reduction

kumar

Thamotharan²,

Naveenchandran³

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Cylinder deactivation is well-known in spark-ignited (SI) engines and compression-ignited (CI) engines. The major reason why the efficiency of these engines is decreased at part load is due to flow restriction in the intake system caused by partially closing throttle valves, which causes increased pumping losses. In order to resolve this issue, the cylinder deactivation system can be implemented in SI engines with four cylinders by developing a suitable control system. Half of the engine's cylinders had their fuel injectors and valve trains turned off, enabling cylinder deactivation (CDA). Fuel consumption was reduced by reducing engine impelling work and decreasing heat transmission to the walls of the cylinder. CDA techniques are tested for their impact on in-cylinder pressure and pumping loss. This work reveals that all of these cylinder deactivation solutions minimize pumping losses and fuel consumption thereby enhancing the engine's thermal efficiency. These findings suggest that closing both intake and exhaust valves is the most effective way of triggering CDA, and lowering BSFC (Brake-specific fuel consumption).

show abstract

Load point shifting for Diesel engines – potentials for passenger car and truck engine applications

Cited by 5 publications

References 0 publications

Thermal Management Concept for the Exhaust Aftertreatment of Commercial Vehicle Diesel Engines Using Variable Mixtures of Diesel Fuel and Rapeseed Oil

Thermal Management Concept for the Exhaust Aftertreatment of Commercial Vehicle Diesel Engines Using Variable Mixtures of Diesel Fuel and Rapeseed Oil

High Efficiency Diesel Engine Concept With Variable Valve Train and Cylinder Deactivation for Integration Into a Tractor

Cylinder deactivation technique in multi-cylinder engines for fuel consumption reduction

Contact Info

Product

Resources

About