Experimental assessment of diesel engine cylinder deactivation performance during low-load transient operations

Allen, Cody M; Joshi, Mrunal C; Gosala, Dheeraj B; Shaver, Gregory M.; Farrell, Lisa; McCarthy, James E.

doi:10.1177/1468087419857597

Cited by 25 publications

(22 citation statements)

References 22 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many previous studies have shown that CDA is an effective method to slow the cooling of after-treatment components during lowloads through reduced exhaust flow and increased exhaust temperatures. [30][31][32] The exhaust temperature and flow rate are effective thermal management indicators to understand the after-treatment thermal management characteristics of an operating point. 29 Allen et al 31 explored the performance of cylinder deactivation in a diesel engine during the low-load operation following highway cruise through experimental evaluation of two drive cycles, specifically extended idle and repeated heavy heavy-duty diesel truck creep cycles.…”

Section: Cylinder Deactivationmentioning

confidence: 99%

“…[30][31][32] The exhaust temperature and flow rate are effective thermal management indicators to understand the after-treatment thermal management characteristics of an operating point. 29 Allen et al 31 explored the performance of cylinder deactivation in a diesel engine during the low-load operation following highway cruise through experimental evaluation of two drive cycles, specifically extended idle and repeated heavy heavy-duty diesel truck creep cycles. The results indicated that CDA can reduce the fuel up to 40% during extended idle operation and maintain the same after-treatment thermal management performance.…”

Section: Cylinder Deactivationmentioning

confidence: 99%

See 1 more Smart Citation

Analysis and optimization of a variable mode valve actuation system

Wang

Cui

Meng

et al. 2020

International Journal of Engine Research

View full text Add to dashboard Cite

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.

show abstract

Section: Cylinder Deactivationmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Retarding or advancing nominal IVC timing decreases air intake and increases engineout temperatures. Another air-reducing technique is to use cylinder deactivation (CDA) [19][20][21][22]. In this method, some of the cylinders on the system are inactivated through switching off both valves and fuel injection.…”

Section: Introductionmentioning

confidence: 99%

Utilizing Exhaust Valve Opening Modulation for Fast Warm-up of Exhaust After-treatment Systems on Highway Diesel Vehicles

Başaran

2020

International Journal of Automotive Science and Technology

View full text Add to dashboard Cite

Current on-road vehicles are generally outfitted with exhaust after-treatment (EAT) systems to meet the stringent emission regulations. At cold start and low-loaded operations, those systems need to be warmed up above a threshold temperature (generally 250oC) for effective performance. High exhaust temperatures and high exhaust flow rates are required to accelerate the EAT warm up which are mostly not available at low-loaded diesel vehicle operations. Therefore, the objective of this work is to improve EAT warm up at low loads through utilizing exhaust valve opening (EVO) modulation which allows both elevated exhaust temperatures and exhaust flow rates. A 1-D engine simulation program is used to model the system which is set to operate at 1200 RPM engine speed and at 2.5 bar brake mean effective pressure (BMEP) engine load. Exhaust temperature can be increased above 250oC via either early or late EVO timings. Reduced expansion work in advanced EVO timings and increased pumping loss in retarded EVO timings require higher fuel consumption (up to 15 % and 20 %, respectively) to keep engine load constant. Those high fuel penalties reduce engine air-to-fuel ratio and rise exhaust temperature more than 55oC. Exhaust mass flow rate is improved up to 9 % in the system as well. The method increases exhaust gas energy up to 40 % and rises heat transfer rate to the EAT system up to 140 % compared to nominal condition. The technique is highly effective at heating up EAT systems, however, it also causes high fuel inefficiency which needs to be considered.

show abstract

“…1–8 Maintaining elevated aftertreatment temperatures is a challenge, especially at low-load diesel engine operation, as the engine-outlet temperatures are too low at these operating conditions. 9–11 Elevated temperatures at low-load operating conditions are typically achieved by making the engine operation inefficient, for example, by increasing the back-pressure to increase the pumping losses, delaying fuel injections to make the combustion process thermodynamically inefficient and intake throttling to reduce airflow.…”

Section: Introductionmentioning

confidence: 99%

Fuel-efficient thermal management in diesel engines via valvetrain-enabled cylinder ventilation strategies

Gosala

Shaver

McCarthy

et al. 2019

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

Modern diesel engine aftertreatment systems require elevated temperatures for effective reduction of engine-out emissions. Maintaining elevated aftertreatment temperatures in a fuel-efficient manner is a challenge, especially at low-load engine operation where engine-outlet temperatures are low; therefore, higher engine-outlet temperatures are typically achieved via increased fuel consumption. Previous studies have demonstrated that strategies such as cylinder deactivation (method where there is neither valve motion nor fuel injection in a subset of cylinders, thereby isolating the deactivated cylinders from the gas exchange process) and cylinder cutout (method where there is no fuel injection in a subset of cylinders, implemented with high recirculated gas rates) reduce fuel consumption while elevating engine-outlet temperatures, by reducing the overall airflow through the engine. This article introduces and characterizes “non-fired cylinder ventilation” as alternate means to achieve fuel-efficient aftertreatment thermal management, by reduction of overall airflow through the engine. Fuel injection is deactivated from a subset of cylinders during non-fired cylinder ventilation, and the non-firing cylinders participate in the gas exchange process with the same manifold at a time, thereby reducing the intake-to-exhaust manifold gas exchange through the cylinders. It is demonstrated that non-fired cylinder ventilation shows similar fuel efficiency and thermal management as cylinder deactivation when the valves of the non-firing ventilated cylinders are open by at least 4 mm, due to similar, negligible, gas-exchange losses, while non-fired cylinder ventilation with lower valve lifts enables elevated engine-outlet temperatures with relatively higher fuel consumption than cylinder deactivation. Non-fired cylinder ventilation strategies demonstrate 75 °C higher temperatures at fuel-neutral conditions, and up to 35% fuel savings at similar temperatures, compared to six-cylinder operation.

show abstract

Experimental assessment of diesel engine cylinder deactivation performance during low-load transient operations

Cited by 25 publications

References 22 publications

Analysis and optimization of a variable mode valve actuation system

Analysis and optimization of a variable mode valve actuation system

Utilizing Exhaust Valve Opening Modulation for Fast Warm-up of Exhaust After-treatment Systems on Highway Diesel Vehicles

Fuel-efficient thermal management in diesel engines via valvetrain-enabled cylinder ventilation strategies

Contact Info

Product

Resources

About