Some Effects of Exhaust Gas Recirculation Upon Automotive Engine Intake System Deposits and Crankcase Lubricant Performance

1971 ◽  
Author(s):  
A. F. Gerber ◽  
R. G. Smith
Keyword(s):  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Automotive Engine ◽  
Intake System ◽  
Gas Recirculation ◽  
Lubricant Performance

Adaptation for Air-Intake System Throttle Control in a Gasoline Engine With Low-Pressure Exhaust-Gas Recirculation

2015 ◽  
Author(s):  
Mario Santillo ◽  
Suzanne Wait ◽  
Julia Buckland
Keyword(s):  
Feedback Control ◽  
Control Strategy ◽  
Gasoline Engine ◽  
Exhaust Gas Recirculation ◽  
Lookup Table ◽  
Exhaust Gas ◽  
Feed Forward ◽  
Intake System ◽  
Air Intake ◽  
Gas Recirculation

We investigate control strategies for traditional throttle-in-bore as well as low-cost cartridge-style throttle bodies for the air-intake system (AIS) throttle used in low-pressure exhaust-gas recirculation (LPEGR) on a turbocharged gasoline engine. Pressure sensors placed upstream and downstream of the AIS throttle are available as signals from the vehicle’s engine control unit, however, we do not use high-bandwidth feedback control of the AIS throttle in order to maintain frequency separation from the higher-rate EGR loop, which uses the downstream pressure sensor for feedback control. A design-of-experiments conducted using a feed-forward lookup table-based AIS throttle control strategy exposes controller sensitivity to part-to-part variations. For accurate tracking in the presence of these variations, we explore the use of adaptive feedback control. In particular, we use an algebraic model representing the throttle plate effective opening area to develop a recursive least-squares (RLS)-based estimation routine. A low-pass filtered version of the estimated model parameters is subsequently used in the forward-path AIS throttle controller. Results are presented comparing the RLS-based feedback algorithm with the feed-forward lookup table-based control strategy. RLS is able to adapt for part-to-part and change-over-time variabilities and exhibits an improved steady-state tracking response compared to the feed-forward control strategy.

Cylinder-to-cylinder high-pressure exhaust gas recirculation dispersion effect on opacity and NOx emissions in a diesel automotive engine

2020 ◽  
pp. 146808741989540 ◽  
Author(s):  
Vicente Macián ◽  
José Manuel Luján ◽  
Héctor Climent ◽  
Julián Miguel-García ◽  
Stéphane Guilain ◽  
...  
Keyword(s):  
High Pressure ◽  
Fuel Consumption ◽  
Exhaust Gas Recirculation ◽  
Accurate Information ◽  
Exhaust Gas ◽  
Engine Operation ◽  
Automotive Engine ◽  
Brake Mean Effective Pressure ◽  
Recirculation Rate ◽  
Gas Recirculation

The objective of the study is to determine the effect of the high-pressure exhaust gas recirculation dispersion in automotive diesel engines in NO x and smoke emissions in steady engine operation. The investigation quantifies the NO x and smoke emissions as a function of the dispersion of the high-pressure exhaust gas recirculation among cylinders. The experiments are performed on a test bench with a 1.6-L automotive diesel engine. In order to track the high-pressure exhaust gas recirculation dispersion in the intake pipes, a valves system to measure CO2, that is, exhaust gas recirculation rate, was installed pipe to pipe. In addition, a valves device to measure NO x emissions cylinder to cylinder in the exhaust was installed. Moreover, a smoke meter device was installed downstream the turbine, to measure the effect of the high-pressure exhaust gas recirculation dispersion on smoke emissions. Five different engine speeds were studied with different torque levels; thus, the engine map was widely studied, from 1250 to 3000 r/min and between 6 and 20 bar of brake mean effective pressure. The exhaust gas recirculation rate varies between 4% and 25% depending on the operating point. The methodology focused on experimental tools combining traditional measuring devices with a specific valves system, which offers accurate information about species concentration in both the intake and the exhaust manifolds. The study was performed at constant raw NO x emissions to observe the effect of the exhaust gas recirculation dispersion in the opacity and fuel consumption. The study concludes that when the exhaust gas recirculation dispersion is low, the opacity presents reduced values in all operating points. However, above a certain level of exhaust gas recirculation dispersion, the opacity increases dramatically with different slopes depending on the engine running condition. This study allows quantifying the exhaust gas recirculation dispersion threshold. In addition, the exhaust gas recirculation dispersion could contribute to increase the fuel consumption up to 3.5%.

Precedent-Free Fault Isolation in a Diesel Engine Exhaust Gas Recirculation System

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Michael E. Cholette ◽  
Dragan Djurdjanovic
Keyword(s):  
Dynamic Models ◽  
Mimo Systems ◽  
Exhaust Gas Recirculation ◽  
Fault Isolation ◽  
Fault Detection And Isolation ◽  
Exhaust Gas ◽  
Multiple Model ◽  
Automotive Engine ◽  
Normal Behavior ◽  
Gas Recirculation

In this paper, a recently introduced model-based method for precedent-free fault detection and isolation (FDI) is modified to deal with multiple input, multiple output (MIMO) systems and is applied to an automotive engine with exhaust gas recirculation (EGR) system. Using normal behavior data generated by a high fidelity engine simulation, the growing structure multiple model system (GSMMS) approach is used to construct dynamic models of normal behavior for the EGR system and its constituent subsystems. Using the GSMMS models as a foundation, anomalous behavior is detected whenever statistically significant departures of the most recent modeling residuals away from the modeling residuals displayed during normal behavior are observed. By reconnecting the anomaly detectors (ADs) to the constituent subsystems, EGR valve, cooler, and valve controller faults are isolated without the need for prior training using data corresponding to particular faulty system behaviors.

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