scholarly journals MODEL-BASED CONTROL OF HYBRID ELECTRIC POWERTRAINS INTEGRATED WITH LOW TEMPERATURE COMBUSTION ENGINES

2017 ◽  
Author(s):  
Ali Soloukmofrad
Keyword(s):  
Low Temperature ◽  
Low Temperature Combustion ◽  
Combustion Engines ◽  
Model Based Control ◽  
Model Based ◽  
Temperature Combustion ◽  
Hybrid Electric ◽  
Electric Powertrains

Triple-injection strategy for model-based control of premixed charge compression ignition diesel engine combustion

2017 ◽  
Vol 19 (2) ◽  
pp. 230-240 ◽  
Author(s):  
Metin Korkmaz ◽  
René Zweigel ◽  
Bernhard Jochim ◽  
Joachim Beeckmann ◽  
Dirk Abel ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Low Temperature ◽  
Engine Performance ◽  
Sound Level ◽  
Low Temperature Combustion ◽  
Injection Strategy ◽  
Model Based Control ◽  
Model Based ◽  
Temperature Combustion ◽  
Injection Strategies

Low-temperature combustion concepts are of great interest due to their potential to reduce nitrogen oxides (NOx) and soot simultaneously. However, low-temperature combustion often leads to an increase in total unburnt hydrocarbons and carbon monoxide. Furthermore, combustion sound level becomes a challenge, especially at higher loads. Various studies show that these drawbacks can be compensated by advanced injection strategies, for example, split injections. In this study, a significantly modified triple-injection approach is proposed. First, the corresponding impact on engine performance is evaluated at stationary conditions, and second, its observed advantages are evaluated at transient operation. Stationary results show that NOx, soot, and combustion sound level are simultaneously reduced without losses in fuel efficiency and without any remarkable rise in total unburnt hydrocarbon as well as carbon monoxide emissions, satisfying Euro 6 emission regulations. Under transient conditions, model-based predictive control of the engine, which allows for reliable steady-state measurements and permits validation tests at transient operating points, is successfully demonstrated for single and triple injection. With both injection strategies, control of indicated mean effective pressure, combustion phasing (CA50 (crank angle (CA) when 50% fuel is consumed)), and NOx emissions is achieved. As a result of this work, the identified optimal triple-injection strategy leads to lower total unburnt hydrocarbon emissions and to significantly reduced combustion sound level at the same level for NOx emissions in comparison with the single-injection approach. Thus, the proposed triple-injection strategy combined with sophisticated model-based control is a promising concept for future engine emission control.

Investigating Fuel Condensation Processes in Low Temperature Combustion Engines

2014 ◽  
Author(s):  
Lu Qiu ◽  
Rolf D. Reitz
Keyword(s):  
Low Temperature ◽  
Combustion Engine ◽  
Phase Region ◽  
Low Temperature Combustion ◽  
Combustion Engines ◽  
Two Phase ◽  
Temperature Combustion ◽  
Real Gas Effects ◽  
Unburned Hydrocarbons ◽  
Late Stages

Condensation of gaseous fuel is investigated in a low temperature combustion engine fueled with double direct-injected diesel and premixed gasoline at two load conditions. Possible condensation is examined by considering real gas effects with the Peng-Robinson equation of state and assuming thermodynamic equilibrium of the two fuels. The simulations show that three representative condensation events are observed. The first two condensations are found in the spray some time after the two direct injections, when the evaporative cooling reduces the local temperature until phase separation occurs. The third condensation event occurs during the late stages of the expansion stroke, during which the continuous expansion sends the local fluid into the two-phase region again. Condensation was not found to greatly affect global parameters, such as the average cylinder pressure and temperature mainly because, before the main combustion event, the condensed phase was converted back to the vapor phase due to compression and/or first stage heat release. However, condensed fuel is shown to affect the emission predictions, including engine-out particulate matter and unburned hydrocarbons.

scholarly journals Catalytic partial oxidation reformation of diesel, gasoline, and natural gas for use in low temperature combustion engines

Fuel ◽  
2019 ◽  
Vol 246 ◽  
pp. 295-307 ◽  
Author(s):  
Deivanayagam Hariharan ◽  
Ruinan Yang ◽  
Yingcong Zhou ◽  
Brian Gainey ◽  
Sotirios Mamalis ◽  
...  
Keyword(s):  
Low Temperature ◽  
Natural Gas ◽  
Partial Oxidation ◽  
Catalytic Partial Oxidation ◽  
Low Temperature Combustion ◽  
Combustion Engines ◽  
Temperature Combustion

Energy Management and Control of a Hybrid Electric Vehicle With an Integrated Low Temperature Combustion (LTC) Engine

2014 ◽  
Author(s):  
Ali Solouk ◽  
Mahdi Shahbakhti ◽  
Mohammad J. Mahjoob
Keyword(s):  
Low Temperature ◽  
Electric Vehicle ◽  
Energy Management ◽  
Fuel Economy ◽  
Hybrid Electric Vehicle ◽  
Low Temperature Combustion ◽  
Si Engine ◽  
Hcci Engine ◽  
Temperature Combustion ◽  
Hybrid Electric

Low Temperature Combustion (LTC) provides a promising solution for clean energy-efficient engine technology which has not yet been utilized in Hybrid Electric Vehicle (HEV) engines. In this study, a variant of LTC engines, known as Homogeneous Charge Compression Ignition (HCCI), is utilized for operation in a series HEV configuration. An experimentally validated dynamic HCCI model is used to develop required engine torque-fuel consumption data. Given the importance of Energy Management Control (EMC) on HEV fuel economy, three different types of EMCs are designed and implemented. The EMC strategies incorporate three different control schemes including thermostatic Rule-Based Control (RBC), Dynamic Programming (DP), and Model Predictive Control (MPC). The simulation results are used to examine the fuel economy advantage of a series HEV with an integrated HCCI engine, compared to a conventional HEV with a modern Spark Ignition (SI) engine. The results show 12.6% improvement in fuel economy by using a HCCI engine in a HEV compared to a conventional HEV using a SI engine. In addition, the selection of EMC strategy is found to have a strong impact on vehicle fuel economy. EMC based on DP controller provides 15.3% fuel economy advantage over the RBC in a HEV with a HCCI engine.

Evolution, challenges and path forward for low temperature combustion engines

2017 ◽  
Vol 61 ◽  
pp. 1-56 ◽  
Author(s):  
Avinash Kumar Agarwal ◽  
Akhilendra Pratap Singh ◽  
Rakesh Kumar Maurya
Keyword(s):  
Low Temperature ◽  
Low Temperature Combustion ◽  
Combustion Engines ◽  
Temperature Combustion
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