Individual A/F Control with Fuel-Gas Ratio Estimation for Multi-cylinder IC Engines

Suzuki, Kenji; Shen, Tielong; Kako, Junichi; Oguri, Y.

doi:10.1109/acc.2007.4282874

Cited by 13 publications

(13 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are several drawbacks with the current A/F ratio control system, such as difficulty controlling the individual cylinder A/F ratio. This high degree of control is desirable to maximize the torque output and minimize emissions [15]. The most significant problem with the current A/F ratio system is the inherent existence of a time delay, which does not allow for good response to transient conditions [15][16][17][18].…”

Section: Biogas Fuelling Of Enginesmentioning

confidence: 99%

See 1 more Smart Citation

Achieving Low Emissions From a Biogas Fueled SI Engine Using a Catalytic Converter

Tadrous

Wallace

2012

ASME 2012 Internal Combustion Engine Division Fall Technical Conference

View full text Add to dashboard Cite

Utilization of biogas is attractive from a greenhouse gas standpoint since it is carbon neutral due to the use of renewable resources. One source of biogas is anaerobic digestors. The biogas produced could be used to power IC engine-generator sets to produce electric power and heat on farms and in rural and northern communities. Use of local energy sources is particularly attractive in remote regions where liquid fuels must be shipped in via difficult terrain. Whatever the fuel, the engine must meet stringent exhaust emission standards. Biogas is typically used in spark ignition engines, where stoichiometric engine operation coupled to a three-way catalyst is a proven technology for achieving low emissions. An appropriate three-way catalyst was selected on the basis of tests with natural gas. A flow mixing system was used to create simulated biogas mixtures consisting of varying concentrations of methane, carbon dioxide, hydrogen and nitrogen. The effectiveness of the catalyst in achieving low emissions when the engine was fueled by the various simulated biogas mixtures was assessed.

show abstract

Section: Biogas Fuelling Of Enginesmentioning

confidence: 99%

“…Suzuki found that with proper modeling, the use of adaptive controls and a single oxygen sensor it was possible for good estimation of an in cylinder A/F ratio as well as control [15]. Liu found that with the use of a phase lock loop it was possible to control the non-linear oxygen sensor output linearly.…”

Section: Biogas Fuelling Of Enginesmentioning

confidence: 99%

Achieving Low Emissions From a Biogas Fueled SI Engine Using a Catalytic Converter

Tadrous

Wallace

2012

ASME 2012 Internal Combustion Engine Division Fall Technical Conference

View full text Add to dashboard Cite

show abstract

“…Before modeling, some feasible hypothesis are taken for the engine system works under a steady operation point, these assumptions can also be found in [3] and [4].…”

Section: Index and Assumptionsmentioning

confidence: 99%

“…Then individual A/F control from the measurement of fluctuation in A/F profile at mixing point in exhaust pipe has drawn lots of attentions in the last decade. For instance, [1], [2] and [3] illustrated some observer techniques for estimation of individual A/F profiles, based on which, individual control law can be found in [4]. The individual A/F ratio balancing problem is also studied in this paper and the main contributions include (1) Based on the proposed models ( [3] [4]), an overlap model for the dynamics from individual fuel injection to the A/F at mixing point is established.…”

Section: Introductionmentioning

confidence: 99%

Individual Air-Fuel Ratio Balancing Control for Multi-Cylinder SI Engines: Modeling and Validation*

Shen

2011

IFAC Proceedings Volumes

Self Cite

View full text Add to dashboard Cite

“…In real-time, Ref. [18] used recursive least square algorithm to estimate air/fuel ratio in each cylinder using a single UEGO sensor placed at the exhaust pipe. The estimated air/fuel ratio was then used in an optimal control algorithm to control individual fuel injector to obtain desired air/fuel ratio in each cylinder.…”

Section: Introductionmentioning

confidence: 99%

Air/Fuel Ratio Control in Diesel-Dual-Fuel Engine by Varying Throttle, EGR Valve, and Total Fuel

Chatlatanagulchai¹,

Rhienprayoon²,

Yaovaja³

et al. 2010

SAE Technical Paper Series

View full text Add to dashboard Cite

From our experiences in converting diesel engine into diesel-dual-fuel engine with natural gas as primary fuel, accurate air/fuel ratio control is vital to the high engine performance, good vehicle drivability, and low emissions. Two components enter in calculating the air/fuel ratio, namely, the amount of fresh air and the amount of diesel and natural gas. Throttle and EGR valve are two actuators directly affect the amount of air, and the desired total fuel determines how much fuel should be injected at an instance. As opposed to inactive, fully opened throttle in typical diesel engine, the throttle in diesel-dual-fuel engine is regulated to cover wider range of desired air/fuel ratio. As a result, the problem of controlling the amount of air in diesel-dual-fuel engine becomes that of multi variables in which both throttle and EGR valve are involved. We present a novel algorithm that breaks the multi-variable control problem into two single-variable problems. The throttle and EGR valve are regulated one at a time as determined by a switch-and-hold logic that optimizes the throttle opening to reduce pumping loss. An algorithm is also proposed to prevent the throttle from fully closed. Because the fuel path is much faster than the air path, including in the algorithm is the adjustment of the desired total fuel according to the air/fuel ratio tracking error. We found that adjusting the total fuel within a limit helps improve the transient response. Experiments were performed on an engine test bed and a pickup truck; both engines were modified from four cylindrical diesel engines to run diesel-dual-fuel, where the natural gas is injected at each intake port. The test bed experiment showed that the air/fuel ratio was accurately regulated with widest range possible. The pickup truck was commanded to follow the new European driving cycle. The results showed that the throttle opening was optimized at all time.

show abstract

Individual A/F Control with Fuel-Gas Ratio Estimation for Multi-cylinder IC Engines

Cited by 13 publications

References 13 publications

Achieving Low Emissions From a Biogas Fueled SI Engine Using a Catalytic Converter

Achieving Low Emissions From a Biogas Fueled SI Engine Using a Catalytic Converter

Individual Air-Fuel Ratio Balancing Control for Multi-Cylinder SI Engines: Modeling and Validation*

Air/Fuel Ratio Control in Diesel-Dual-Fuel Engine by Varying Throttle, EGR Valve, and Total Fuel

Contact Info

Product

Resources

About