Dynamic cylinder activation in diesel engines

Gosala, Dheeraj B; Allen, Cody M; Shaver, Gregory M.; Farrell, Lisa; Koeberlein, Edward; Franke, Brian Claude; Stretch, Dale; McCarthy, James E.

doi:10.1177/1468087418779937

Cited by 14 publications

(10 citation statements)

References 25 publications

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“…[21][22][23][24][25][26][27] Cylinder deactivation (CDA) is an operating strategy for a multi-cylinder engine, which is typically implemented by suspending fueling and valve motion in the deactivation cylinder during the low-load operation. [28][29][30] It is widely used in gasoline engines because it can significantly reduce pumping loss, while the pumping loss of diesel engine is relatively small. Diesel engines are thermally efficient, but require complex after-treatment systems including diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and selective catalytic reduction (SCR).…”

Section: Cylinder Deactivationmentioning

confidence: 99%

Analysis and optimization of a variable mode valve actuation system

Wang

Cui

Meng

et al. 2020

International Journal of Engine Research

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Braking safety of heavy-duty engines has always been the focus of the research, and the fuel economy and after-treatment thermal management during low-load operation of heavy-duty engines have also received much attention in recent years. A variable mode valve actuation system which can realize switching between four-stroke driving, two-stroke compression release braking and cylinder deactivation modes on a traditional four-stroke engine was proposed in this article. Two-stroke compression release braking mode of the variable mode valve actuation system can greatly enhance the braking safety, while the overload of valve train was a great challenge, especially during the release event. The effects of different release opening timing on cylinder pressure and the braking performance were studied. The results indicated that a higher cylinder pressure does not always lead to higher braking power. When the release opening timing was advanced by 6 °CA, the braking power reduced by only 9 kW (2.65%) at 1900 r/min compared with the initial value, while the maximum cylinder pressure reduced by 11.4 bar (20.8%). Besides, the variable mode valve actuation system can realize alternate three-cylinder cylinder deactivation mode on a six-cylinder turbocharged engine, which can improve the brake-specific fuel consumption by 14.67% and increase the turbine outlet temperature by 63.6 °C and reduce the exhaust flow rate by 50.66% at lightly load idle. Meanwhile, when the engine load is less than 50% at the rated speed, the three-cylinder cylinder deactivation mode can improve the brake-specific fuel consumption, increase the turbine outlet temperature and reduce the exhaust flow rate. The increase of the turbine outlet temperature and the decrease of the exhaust flow rate are very beneficial to improve the efficiency of the after-treatment thermal management of heavy-duty engines.

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Section: Cylinder Deactivationmentioning

confidence: 99%

Analysis and optimization of a variable mode valve actuation system

Wang

Cui

Meng

et al. 2020

International Journal of Engine Research

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“…For example, on a V8 engine, any possible combination of active and inactive cylinders can be realized. A similar concept has been successfully transferred to a concept diesel engine [17].…”

Section: Introductionmentioning

confidence: 99%

A detailed study of a cylinder activation concept by efficiency loss analysis and 1D simulation

Buitkamp

Guenthner

Müller

et al. 2020

Automot. Engine Technol.

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Cylinder deactivation is a well-known measure for reducing fuel consumption, especially when applied to gasoline engines. Mostly, such systems are designed to deactivate half of the number of cylinders of the engine. In this study, a new concept is investigated for deactivating only one out of four cylinders of a commercial vehicle diesel engine (“3/4-cylinder concept”). For this purpose, cylinders 2–4 of the engine are operated in “real” 3-cylinder mode, thus with the firing order and ignition distance of a regular 3-cylinder engine, while the first cylinder is only activated near full load, running in parallel to the fourth cylinder. This concept was integrated into a test engine and evaluated on an engine test bench. As the investigations revealed significant improvements for the low-to-medium load region as well as disadvantages for high load, an extensive numerical analysis was carried out based on the experimental results. This included both 1D simulation runs and a detailed cylinder-specific efficiency loss analysis. Based on the results of this analysis, further steps for optimizing the concept were derived and studied by numerical calculations. As a result, it can be concluded that the 3/4-cylinder concept may provide significant improvements of real-world fuel economy when integrated as a drive unit into a tractor.

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“…Cylinder deactivation is an effective measure to improve fuel economy, which is achieved by keeping all the intake and exhaust valves closed without fuel injection. [37][38][39] Cylinder deactivation of multi-cylinder machine was widely used on gasoline engine because it can significantly reduce pumping loss, but the research on cylinder deactivation on diesel engine was still relatively premature. 40 Zammit et al 41 investigated the potential benefits and limitations of deactivating two of the four cylinders by cam switching to disable the intake and exhaust valve lift.…”

Section: Introductionmentioning

confidence: 99%

Development of a variable mode valve actuation system for a heavy-duty engine

Wang

Long

Cui

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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A new variable mode valve actuation system for a heavy-duty engine was proposed and designed in this paper. The variable mode valve actuation system can significantly enhance braking safety and improve fuel economy and emission of heavy-duty engines through flexible switching among four-stroke driving mode, two-stroke compression-release braking mode, and cylinder deactivation mode on a conventional four-stroke engine. The switching was controlled by four-stroke driving modules and two-stroke braking modules, both of which have two operation states: effective state and failure state. For the control of the multi-cylinder engine, all cylinders can be divided into several groups, and all the four-stroke driving modules in the same group were controlled by one solenoid valve, as well as all the two-stroke braking modules were controlled by another solenoid valve. A hydraulic-mechanical multi-body dynamics model was established to investigate the switching response of the variable mode valve actuation system. The results indicated that when the engine operated at 2000 r/min, the switching of the four-stroke driving module and the two-stroke braking module required 30 °CA and 101 °CA at most, respectively. In addition, to avoid the conflict between the four-stroke driving valve lift and the two-stroke braking valve lift, the switching between the four-stroke driving mode and the two-stroke compression-release braking mode must have a reasonable sequence. The variable mode valve actuation system has an excellent switching response and it is convenient for the control of the multi-cylinder engine. Therefore, the variable mode valve actuation system has a good application prospect for heavy-duty engines.

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Dynamic cylinder activation in diesel engines

Cited by 14 publications

References 25 publications

Analysis and optimization of a variable mode valve actuation system

Analysis and optimization of a variable mode valve actuation system

A detailed study of a cylinder activation concept by efficiency loss analysis and 1D simulation

Development of a variable mode valve actuation system for a heavy-duty engine

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