scholarly journals Estimation of Individual Cylinder Air-Fuel Ratio in Gasoline Engine with Output Delay

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Changhui Wang ◽  
Zhiyuan Liu
Keyword(s):  
Gasoline Engine ◽  
Delay System ◽  
Exhaust Pipe ◽  
Gas Mixing ◽  
Fuel Ratio ◽  
Torque Generation ◽  
Output Delay ◽  
Reduce Emissions ◽  
The Individual ◽  
Balancing Control

The estimation of the individual cylinder air-fuel ratio (AFR) with a single universal exhaust gas oxygen (UEGO) sensor installed in the exhaust pipe is an important issue for the cylinder-to-cylinder AFR balancing control, which can provide high-quality torque generation and reduce emissions in multicylinder engine. In this paper, the system dynamic for the gas in exhaust pipe including the gas mixing, gas transport, and sensor dynamics is described as an output delay system, and a new method using the output delay system observer is developed to estimate the individual cylinder AFR. With the AFR at confluence point augmented as a system state, an observer for the augmented discrete system with output delay is designed to estimate the AFR at confluence point. Using the gas mixing model, a method with the designed observer to estimate the individual cylinder AFR is presented. The validity of the proposed method is verified by the simulation results from a spark ignition gasoline engine from engine software enDYNA by Tesis.

Idle speed performance improvement via torque balancing control in ignition-event scale for SI engines with multi-cylinders

2011 ◽  
Vol 13 (1) ◽  
pp. 65-76 ◽  
Author(s):  
P Li ◽  
T Shen ◽  
D Liu
Keyword(s):  
Feedback Control ◽  
Engine Speed ◽  
Gasoline Engine ◽  
Switching Function ◽  
Event Scale ◽  
Torque Generation ◽  
Speed Performance ◽  
Si Engines ◽  
The Individual ◽  
Balancing Control

Imbalance in torque generation leads to engine speed fluctuation. To improve the idle engine speed performance, the torque balancing control problem is addressed in this paper for multi-cylinder SI engines. To evaluate cylinder-to-cylinder imbalance, the average torque in ignition-event scale is introduced as controlled output, which enables a feedback control to be performed without measurement of instantaneous torque, and the individual spark advances are chosen as control inputs. A linear discrete time model with single input and single output is proposed to represent the dynamics of the imbalance, where a sequentially switching function is introduced to describe the spark advance signals delivered to each cylinder and the differences in torque generation caused by the individual cylinder characteristics are equivalently modelled as unknown offset in the inputs. An estimation algorithm with the proof of convergence is presented to provide on-line estimation of the unknown offset under the passivity assumption of the system. Furthermore, a feedback control law which combines the unknown offset estimation and the model predictive control is proposed. Finally, the unknown offset estimation and the feedback control approach are validated based on the experimental results carried out on a six-cylinder gasoline engine test bench.

scholarly journals Individual Cylinder Air-Fuel Ratio Estimation for a Gasoline Engine with Electromagnetic Valve Train

2018 ◽  
Vol 202 ◽  
pp. 02011
Author(s):  
Yaxuan Xu ◽  
Siqin Chang
Keyword(s):  
Steady State ◽  
Gasoline Engine ◽  
Estimation Algorithm ◽  
Valve Train ◽  
Unknown Parameters ◽  
Steady State Condition ◽  
Electromagnetic Valve ◽  
Fuel Ratio ◽  
De Algorithm ◽  
The Individual

For the multi cylinder gasoline engine, the consistency of each cylinder is an important index to affect the emission and the power. In this paper, in order to reduce the air-fuel ratio (A/F) maldistribution of the engine based on the electromagnetic valve train (EMVT), an individual cylinder A/F estimation algorithm is proposed for the individual cylinder A/F control. Based on the analysis of the hybrid and transfer models of the exhaust of each cylinder in steady state, an individual A/F observer is established by using Kalman filter algorithm. Then the unknown parameters in the observer are identified by the differential evolution(DE) algorithm. Only a single wide area exhaust oxygen(UEGO) sensor is needed to identify the unknown parameters and estimate the A/F of each cylinder. The combined simulation of GT-Power and Simulink validates the effectiveness of the proposed estimation approach. The results show that the proposed method can provide good estimation results under steady-state condition.

The effect of air/fuel ratio on the CO and NOx emissions for a twin-spark motorcycle gasoline engine under wide range of operating conditions

Energy ◽  
2019 ◽  
Vol 169 ◽  
pp. 1202-1213 ◽  
Author(s):  
Banglin Deng ◽  
Qing Li ◽  
Yangyang Chen ◽  
Meng Li ◽  
Aodong Liu ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
Operating Conditions ◽  
Nox Emissions ◽  
Fuel Ratio ◽  
Wide Range

Understanding and Optimizing Vessel Propulsive Power and Fuel Use: Using Duty Cycle Analysis Computations

2014 ◽  
Author(s):  
Donald MacPherson ◽  
Elizabeth Boyd
Keyword(s):  
Systems Engineering ◽  
Duty Cycle ◽  
Operating Mode ◽  
Mode Analysis ◽  
Maritime Industry ◽  
Financial Return ◽  
Operating Modes ◽  
Strategic Plans ◽  
Reduce Emissions ◽  
The Individual

The maritime industry is in a mindset to save fuel and reduce emissions. How one achieves this end, however, can be a matter of some debate. While substantial industry effort is being placed on things that can be optimized, to achieve real benefit and financial return one must first understand the details about how the vessel consumes propulsive energy during its mission. This paper discusses a rational, simple, and effective systems engineering approach to identify power and fuel demands via computational propulsion analysis of the individual operating modes of a vessel’s duty cycle. It explains sensible consumption metrics that can be used to evaluate and compare different physical systems, strategic plans, or helm decisions. A duty cycle operating mode analysis calculation for a tugboat in multi-role service (as a harbor tug and in long haul ocean barge towing) is demonstrated using COTS software, including examples of design-side and shipboard decision options and consequences.

A digital system for generating dynamic sinusoidal gas concentration signals

1988 ◽  
Vol 65 (2) ◽  
pp. 945-949 ◽  
Author(s):  
S. A. Barton ◽  
L. Sutton ◽  
C. E. Hahn ◽  
A. M. Black
Keyword(s):  
Frequency Modulation ◽  
Pulse Frequency ◽  
Respiratory Monitoring ◽  
Gas Mixing ◽  
Pulse Frequency Modulation ◽  
Gas Concentration ◽  
Mixing Chamber ◽  
Computer Controlled ◽  
The Individual ◽  
Valve Switching

A computer-controlled gas-mixing system is presented. It is capable of mixing four gases, the concentration of three of which will follow a path to be determined by the user. For our purposes the output O2 fraction is maintained constant and the levels of Ar and N2O vary sinusoidally and independently, with periods between 0.25 and 30 min. A fourth gas, N2 is necessary to make the sum of the individual fractions 100%. The system uses banks of between one and four solenoid valves each linked via a sonic choke to a common mixing chamber. A regime of pulse frequency modulation is employed. All calculations and timing of valve switching are performed by a dedicated microcomputer built for the purpose. The device has been used to provide respiratory gas forcing functions for a program of research in respiratory monitoring.

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