Sliding Mode Fuel-Injection Controller: Its Advantages

1991 ◽  
Vol 113 (3) ◽  
pp. 537-541 ◽  
Author(s):  
Dan Cho ◽  
J. Karl Hedrick
Keyword(s):  
Oxygen Sensor ◽  
Fuel Injection ◽  
Control Method ◽  
Sliding Mode ◽  
Automatic Transmission ◽  
Injection System ◽  
Sensor Technology ◽  
Stoichiometric Ratio ◽  
Model Errors ◽  
Operating Characteristics

New and improved results are presented on the advantages of employing the sliding mode control method for designing a closed-loop fuel-injection system. The two biggest advantages of this method are: (1) its compatibility with the current oxygen sensor technology and (2) its ability to consider robustness and performance issues analytically for an automotive engine, whose operating characteristics are highly complex and nonlinear. The controller can achieve the stoichiometric ratio control of air and fuel with excellent transient properties and is robust to model errors and disturbances. Furthermore, through direct comparisons to PI-controllers, it is shown that the sliding mode fuel-injection controller is versatile and requires very little tuning time. Performance evaluations are performed both on an engine-only model and on a comprehensive powertrain model that includes automatic transmission and drivetrain dynamics.

A Nonlinear Controller Design Method for Fuel-Injected Automotive Engines

1988 ◽  
Vol 110 (3) ◽  
pp. 313-320 ◽  
Author(s):  
D. Cho ◽  
J. K. Hedrick
Keyword(s):  
Fuel Injection ◽  
Control Method ◽  
Controller Design ◽  
Sliding Mode ◽  
Design Method ◽  
Model Errors ◽  
Nonlinear Controller ◽  
Engine Model ◽  
Automotive Engines ◽  
On Line

A nonlinear, “sliding mode” fuel-injection controller is designed based on a physically motivated, mathematical engine model. The designed controller can achieve a commanded air-to-fuel ratio with excellent transient properties, which offers the potential for improving fuel economy, torque transients, and emission levels. The controller is robust to model errors as well as to rapidly changing maneuvers of throttle and spark advance. The sliding mode control method offers a great potential for future engine control problems, since: it results in a relatively simple control structure that requires little on-line computing and no table lookups; it is robust to model errors and disturbances; and it can be easily adapted to a family of engines.

An adaptive sliding mode controller for air-fuel ratio control of spark ignition engines

2001 ◽  
Vol 215 (2) ◽  
pp. 305-315 ◽  
Author(s):  
P Yoon ◽  
M Sunwoo
Keyword(s):  
Control Algorithm ◽  
Oxygen Sensor ◽  
Fuel Injection ◽  
Sliding Mode ◽  
Model Parameters ◽  
Model Errors ◽  
Engine Model ◽  
Fuel Ratio ◽  
Adaptive Sliding Mode Controller ◽  
Measurement Delay

An adaptive dynamic sliding mode fuel injection control algorithm based on the measurement of a binary oxygen sensor to reduce the exhaust gas emissions is proposed. The controller suggested in this paper is designed on the basis of the two-state dynamic engine model developed in the crank angle domain, and it is composed of an adaptation law for fuel delivery model parameters and measurement bias in mass air flowrate. The control algorithm is mathematically compact enough to run in real time, and it is robust to modelling errors as well as to rapidly changing manoeuvres of the throttle. The simulation and experimental results show that this algorithm can substantially reduce the transient peaks in air-fuel ratio (AFR) while maintaining robustness to model errors and measurement delay.

Effects of working conditions on the operating characteristics of an injection system applied on CNG fueled vehicles

2021 ◽  
pp. 095440702110694
Author(s):  
Nguyen Ba Hung ◽  
Le Anh Tuan ◽  
Ocktaeck Lim
Keyword(s):  
Fuel Injection ◽  
Gas Pressure ◽  
Injection System ◽  
Fuel Injection System ◽  
Operating Characteristics ◽  
Pressure Regulator ◽  
Maximum Fluctuation ◽  
Coil Resistance ◽  
Simulation Results ◽  
Electric Pressure

A model-based study is conducted to examine the operating characteristics of an injection system applied on CNG fueled vehicles. This injection system is a combination of an electric pressure regulator, a rail tube, and a solenoid injector. The electric pressure regulator has a great potential to be widely used in injection systems of natural gas-fueled engines due to its flexible operation, which can help to improve the engine performance and reduce emission. This paper presents a simulation study using mathematical models to describe and analyze the operating characteristics of the gaseous fuel injection system, in which models of electric pressure regulator, solenoid fuel injector, and control model for electric pressure regulator are presented. The simulation results are compared with experimental data to validate the simulation models. Effects of working conditions, including coil resistance of the electric pressure regulator, inlet gas pressure, and set pressure in the rail tube, on the operating characteristics of the gaseous fuel injection system are investigated. Simulation results show that when the coil resistance of the electric pressure regulator is increased from 3.1 Ω to 4.1 Ω, the maximum fluctuation of the controlled gas pressure in the rail tube is reduced from 0.017 to 0.012 MPa, respectively. By decreasing the inlet gas pressure of the electric pressure regulator from 2.5 to 2.3 MPa, the controlled gas pressure in the rail tube is more stable with the maximum fluctuation significantly reduced from 0.012 to 0.002 MPa, respectively, which leads to stability in injection flow rate. The increase of set pressure in the rail tube from 0.5 to 0.7 MPa can help to improve the stability of the controlled gas pressure in the rail tube with the maximum fluctuation respectively reduced from 0.002 to 0.001 MPa.

Modulated fuel feedback control of a fuel injection engine using a switch type oxygen sensor

1997 ◽  
Vol 211 (6) ◽  
pp. 491-497 ◽  
Author(s):  
K S Park ◽  
J Park ◽  
S K Kauh ◽  
S T Ro ◽  
J Lee
Keyword(s):  
Feedback Control ◽  
Oxygen Sensor ◽  
Fuel Injection ◽  
Control Method ◽  
Modulation Method ◽  
Control Logic ◽  
Fuel Ratio ◽  
Switch Type ◽  
Three Way Catalyst ◽  
Ramp Control

The jump—ramp control algorithm has been widely adopted for the air—fuel ratio control in a fuel injection spark ignition (SI) engine by using a conventional on—off type oxygen sensor. But the jump—ramp control method has limitations in improving the frequency and amplitude of the air—fuel ratio oscillation. This study suggests a new feedback control logic called modulated fuel feedback control, which has a concept of pretuned air—fuel ratio oscillation. In the modulation method, the oxygen sensor output is not treated as on—off but as an analogue for feedback. By using the modulation method, the frequency and amplitude of the air—fuel ratio oscillation can be controllable to some extent to improve the conversion efficiency of a three-way catalyst. The results show that the performance of the modulation method is better than that of the jump—ramp control method in reducing the amplitude of the air—fuel ratio oscillation as well as in increasing the frequency of the air—fuel ratio oscillation.

Analysis on Effects of Fuel Cam on High-Pressure Fuel System

2011 ◽  
Vol 328-330 ◽  
pp. 948-952
Author(s):  
Ming Hai Li ◽  
Biao Liu ◽  
You Bo Ning
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Fuel Mixture ◽  
Injection System ◽  
Engine Fuel ◽  
Operating Characteristics ◽  
Engine Simulation ◽  
Cam Profile

GT-Suite software is used to establish the simulation model of high-pressure fuel injection system for diesel engine. Simulation parameters are modified based on the comparison with given experimental results. In order to improve diesel engine fuel injection performance, the cam profile was improved to ensure a high injection pressure and smooth operating characteristics. A more reasonable fuel cam profile was designed by analyzing the injection characteristics and dynamics. It improves the fuel mixture formation and combustion, so diesel economy and emissions performance are also guaranteed.

scholarly journals High speed visualization of gasoline pump injector (GPI)

2017 ◽  
Author(s):  
Nallannan Balasubramanian ◽  
Titus Iwaszkiewicz ◽  
Jayabalan Sethuraman
Keyword(s):  
High Speed ◽  
Oxygen Sensor ◽  
Fuel Injection ◽  
Electronic Control Unit ◽  
Control Unit ◽  
Time Response ◽  
Injection System ◽  
Exhaust Pipe ◽  
Fuel Injector ◽  
Two Wheeler

Two-wheeler engines still use carburetor as a fuelling system in many Asian countries, owing to its low cost andless maintenance. The usage of carburetor to handle the upcoming stringent emission norms gets difficult, due to the absence of a closed-loop fuel correction. An electronic fuel injector (EFI), on the other hand, with the help of an electronic control unit (ECU), can correct the fuel quantity and set the air-fuel mixture close to stoichiometric, based on the feedback obtained from the oxygen sensor placed in the exhaust pipe. In this context, an innovative injection system has been developed, that can be applied for such electronic fuel injection in two-wheelers. In this design, the pump and injector are integrated into a single unit, making the system, simple, compact and less expensive. The integrated injector uses a solenoid and spring arrangement, for pressurizing the fuel in a small chamber, and the pressurized fuel is then injected through orifices to produce spray in the intake port. Two-wheeler engines can operate in the order of 10,000 rpm and it poses a big challenge in such injector designs, and therefore the time response of the mechanical and magnetic components of the injector become critical. High-speed back-lit imaging helps in understanding the time response of such injector, by visualizing the spray, while injecting continuously over a period of time. This paper presents the results of high-speed images, obtained from the spray of this new-concept gasoline pump injector (GPI). This exercise, demonstrated that this injector can work at a frequency as high as 83 Hz and also consistently. The spray pattern was found to be very unique and different from the conventional PFIinjection sprays.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4796

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