scholarly journals Misfire detection based on switched state observer of hybrid system in internal combustion engine

2017 ◽  
Author(s):  
Yu Zhang ◽  
Tonglin Zhou ◽  
Taixiong Zheng ◽  
Weimin Han ◽  
Rui Tan ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Hybrid System ◽  
Combustion Engine ◽  
Internal Combustion ◽  
State Observer ◽  
Misfire Detection

scholarly journals Control Strategy Development of Driveline Vibration Reduction for Power-Split Hybrid Vehicles

2020 ◽  
Vol 10 (5) ◽  
pp. 1712 ◽  
Author(s):  
Hsiu-Ying Hwang ◽  
Tian-Syung Lan ◽  
Jia-Shiun Chen
Keyword(s):  
Internal Combustion Engine ◽  
Hybrid System ◽  
Electric Motor ◽  
Combustion Engine ◽  
Vibration Reduction ◽  
Internal Combustion ◽  
Hybrid Vehicles ◽  
Strategy Development ◽  
Vibration Source ◽  
Power Split

In order to achieve better performance of fuel consumption in hybrid vehicles, the internal combustion engine is controlled to operate under a better efficient zone and often turned off and on during driving. However, while starting or shifting the driving mode, the instantaneous large torque from the engine or electric motor may occur, which can easily lead to a high vibration of the elastomer on the driveline. This results in decreased comfort. A two-mode power-split hybrid system model with elastomers was established with MATLAB/Simulink. Vibration reduction control strategies, Pause Cancelation strategy (PC), and PID control were developed in this research. When the system detected a large instantaneous torque output on the internal combustion engine or driveline, the electric motor provided corresponding torque to adjust the torque transmitted to the shaft mitigating the vibration. To the research results, in the two-mode power-split hybrid system, PC was able to mitigate the vibration of the engine damper by about 60%. However, the mitigation effect of PID and PC-PID was better than PC, and the vibration was able to converge faster when the instantaneous large torque input was made. In the frequency response, the effect of the PID blocking vibration source came from the elastomer was about 75%, while PC-PID additionally reduced 8% by combining the characteristics of the two control methods.

Part Load Efficiency Enhancement of an Automotive Engine Via a Direct Methanol Fuel Cell-Internal Combustion Engine Hybrid System

2013 ◽  
Vol 10 (3) ◽  
Author(s):  
Osman Sinan Suslu ◽  
Ipek Becerik
Keyword(s):  
Fuel Cell ◽  
Internal Combustion Engine ◽  
Hybrid System ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Fuel Saving ◽  
System Efficiency ◽  
Product Gas ◽  
Direct Methanol ◽  
A Cell

The operation of a direct methanol fuel cell with an internal combustion engine in a hybrid system is investigated in terms of fuel efficiency. The following work shows a potential for fuel saving because the engine's waste heat is utilized in preconditioning of methanol for the fuel cell and in postconditioning of the cell's anode exhaust for the engine. The low activity of methanol oxidation catalysts and methanol crossover are the main drawbacks of direct methanol fuel cells. H3PO4-doped polybenzimidazole membranes have lower methanol crossover, and allow a higher operational temperature and methanol concentration compared to Nafion membranes. The operation of the cell at higher temperature with polybenzimidazole membranes improves catalyst activity and mass transfer increasing cell efficiency. But the fuel feed to this type of membrane must be in vapor phase. Methanol solution can be evaporated by the engine coolant. Unutilized methanol in the anode exhaust is converted to H2 rich product gas in a reactor before feeding into the engine. The endothermic reaction enthalpy for this conversion is recovered from engine's exhaust gas. The system efficiency increases with the cell's fuel utilization, as long as the cell's efficiency is higher than the engine's efficiency. In order to increase the system efficiency with load, the current density of the fuel cell should not be increased beyond the point where the cell and engine efficiency meet. Beyond that, the product gas should be substituted with liquid methanol to meet the rest of the load because the engine charge's energy density can be increased with liquid methanol injection into the engine. If the engine charge is comprised of fuel cell exhaust only and the engine's indicated efficiency is 20%, the efficiency of the hybrid system will be 25.5% at a cell voltage of 0.4 V and a cell fuel utilization of 40%. This corresponds to a fuel saving of 28% compared to the internal combustion engine. The hybrid system efficiency will increase to 28.5% at this operating point, if the fuel cell's anode exhaust is further decomposed in a reactor prior to combustion in the engine. The addition of the reactor to the hybrid system corresponds to a fuel saving of 43% compared to the engine and a fuel saving of 12% compared to the hybrid system without the reactor.

Misfire detection of an internal combustion engine based on vibration and acoustic analysis

2021 ◽  
Vol 43 (7) ◽  
Author(s):  
João L. Firmino ◽  
João M. Neto ◽  
Andersson G. Oliveira ◽  
José C. Silva ◽  
Koje V. Mishina ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Acoustic Analysis ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Misfire Detection
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