Misfire Detection of Spark Ignition Engines Using a New Technique Based on Mean Output Power

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
M. Boudaghi ◽  
M. Shahbakhti ◽  
S. A. Jazayeri
Keyword(s):  
Steady State ◽  
Output Power ◽  
Engine Speed ◽  
Control Unit ◽  
Spark Ignition ◽  
New Technique ◽  
Si Engine ◽  
Engine Model ◽  
Wide Range ◽  
Misfire Detection

Control and detection of misfire are an essential part of on-board diagnosis (OBD) of modern spark ignition (SI) engines. This study proposes a novel model-based technique for misfire detection for a multicylinder SI engine. The new technique uses a dynamic engine model to determine mean output power, which is then used to calculate a new parameter for misfire detection. The new parameter directly relates to combustion period and is sensitive to engine speed fluctuations caused by misfire. The new technique requires only measured engine speed data and is computationally viable for use in a typical engine control unit (ECU). The new technique is evaluated experimentally on a four-cylinder 1.6-l SI engine. Three types of misfire are studied including single, continuous, and multiple-event. The steady-state and transient experiments were done for a wide range of engine speeds and engine loads, using a vehicle chassis dynamometer and on-road vehicle testing. The validation results show that the new technique is able to detect all three types of misfire with up to 94% accuracy during steady-state conditions. The new technique is augmented with a compensation factor to improve the accuracy of the technique for transient operations. The resulting technique is shown to be capable of detecting misfire during both transient and steady-state engine conditions.

A New Physics-Based Misfire Detection Technique for a SI Engine

2013 ◽  
Author(s):  
M. Boudaghi Kh. N. ◽  
M. Shahbakhti ◽  
S. A. Jazayeri
Keyword(s):  
Steady State ◽  
Engine Speed ◽  
New Physics ◽  
New Technique ◽  
Si Engine ◽  
Engine Model ◽  
Compensation Factor ◽  
Wide Range ◽  
Percent Accuracy ◽  
Misfire Detection

Control and detection of misfire is an essential part of on-board diagnosis of modern SI engines. This study proposes a novel model-based technique for misfire detection of a multi-cylinder SI engine. The new technique uses a dynamic engine model to determine mean output power, which is then used to calculate a new parameter for misfire detection. The new parameter directly relates to combustion period and is sensitive to the engine speed fluctuations caused by misfire. The new technique only requires measured engine speed data and it is computationally viable for use in a typical ECU. The new technique is evaluated experimentally on a 4-cylinder 1.6-liter SI engine. Three types of misfires are studied including single, continues, and multiple events. The steady-state and transient experiments were done for a wide range of engine speeds and engine loads, using a vehicle chassis dynamometer and on-road vehicle testing. The validation results show the new technique is capable to detect all the three types of misfire with up to 97 percent accuracy during steady-state conditions. The new technique is augmented with a compensation factor to improve the accuracy of the technique for transient operations. The resulting technique is shown to be capable of detecting misfire during both transient and steady-state engine conditions.

scholarly journals Optimization of 2‑Stage Turbocharged Gas SI Engine Under Steady State Operation

2017 ◽  
Vol 15 (2) ◽  
pp. 9-36
Author(s):  
Oldřich Vítek ◽  
Jan Macek ◽  
Jiří Klíma ◽  
Martin Vacek
Keyword(s):  
Steady State ◽  
Control Algorithm ◽  
Engine Speed ◽  
Boost Pressure ◽  
Si Engine ◽  
Engine Model ◽  
Steady State Operation ◽  
Swallowing Capacity ◽  
The Right ◽  
Different Levels

Abstract The proposed paper deals with an optimization of a highly-turbocharged large-bore gas SI engine. Only steady state operation (constant engine speed and load) is considered. The paper is mainly focused on theoretical potential of 2-stage turbocharging concept in terms of performance and limitation. The results are obtained by means of simulation using complex 0-D/ 1-D engine model including the control algorithm. Different mixture composition concepts are considered to satisfy different levels of NOx limit - fresh air mixed with external cooled EGR is supposed to be the right approach while optimal EGR level is to be found. Considering EGR circuit, 5 different layouts are tested to select the best design. As the engine control is relatively complex (2-sage turbocharger group, external EGR, compressor blow-by, controlled air excess), 5 different control means of boost pressure were considered. Each variant based on above mentioned options is optimized in terms of compressor/turbine size (swallowing capacity) to obtain the best possible BSFC. The optimal variants are compared and general conclusions are drawn.

scholarly journals Efficiency characteristics of a new quasi-constant volume combustion spark ignition engine

2013 ◽  
Vol 17 (1) ◽  
pp. 119-133 ◽  
Author(s):  
Jovan Doric ◽  
Ivan Klinar
Keyword(s):  
Engine Speed ◽  
Combustion Process ◽  
Spark Ignition ◽  
Constant Volume ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
Piston Mechanism ◽  
Si Engines ◽  
Ic Engines ◽  
Engine Concept

A zero dimensional model has been used to investigate the combustion performance of a four cylinder petrol engine with unconventional piston motion. The main feature of this new spark ignition (SI) engine concept is the realization of quasi-constant volume (QCV) during combustion process. Presented mechanism is designed to obtain a specific motion law which provides better fuel consumption of internal combustion (IC) engines. These advantages over standard engine are achieved through synthesis of unconventional piston mechanism. The numerical calculation was performed for several cases of different piston mechanism parameters, compression ratio and engine speed. Calculated efficiency and power diagrams are plotted and compared with performance of ordinary SI engine. The results show that combustion during quasi-constant volume has significant impact on improvement of efficiency. The main aim of this paper is to find a proper kinematics parameter of unconventional piston mechanism for most efficient heat addition in SI engines.

Data-driven algorithms for engine friction estimation

2007 ◽  
Vol 221 (7) ◽  
pp. 901-909 ◽  
Author(s):  
A A Stotsky
Keyword(s):  
Engine Speed ◽  
Control Unit ◽  
Spark Ignition ◽  
Friction Torque ◽  
Data Driven ◽  
Periodic Signal ◽  
Computationally Efficient ◽  
Engine Torque ◽  
Look Up Table ◽  
Engine Friction

Errors in the estimation of friction torque in modern spark ignition automotive engines necessitate the development of real-time algorithms for adaptation of the friction torque. Friction torque in the engine control unit is presented as a look-up table with two input variables (the engine speed and indicated engine torque). The algorithms proposed in this paper estimate the engine friction torque via the crankshaft speed fluctuations at the fuel cut-off state and at idle. A computationally efficient filtering algorithm for reconstruction of the first harmonic of a periodic signal is used to recover an amplitude which corresponds to engine events from the noise-contaminated engine speed measurements at the fuel cut-off state. The values of the friction torque at the nodes of the look-up table are updated, when new measured data of the friction torque are available. New data-driven algorithms which are based on a stepwise regression method are developed for adaptation of look-up tables. The algorithms are verified by using a spark ignition six-cylinder prototype engine.

scholarly journals Development and Evaluation of Integrated Flight/Propulsion Control Algorithms for a Tactical Fighter

1984 ◽  
Author(s):  
C. M. Carlin ◽  
L. L. Munger ◽  
D. Gangsaas
Keyword(s):  
Steady State ◽  
Flight Path ◽  
System Model ◽  
Control Law ◽  
Preliminary Evaluation ◽  
Linear Quadratic ◽  
Integral Control ◽  
Engine Model ◽  
Wide Range ◽  
Trailing Edge Flaps

Linear quadratic synthesis is applied to the design of an integrated vertical flight path and airspeed command and stability augmentation control law for the AFTI/F-111 aircraft. A feedforward controller combined with full-state feedback provides nearly decoupled response to normal and longitudinal acceleration commands, as well as steady-state tracking of vertical flight path and airspeed. Integral control of the flap commands maintains the wing camber for minimum drag in steady-state maneuvers. Enhanced maneuverability and reduction of pilot workload are achieved through coordinated commands to the leading and trailing edge flaps, stabilons and engine throttles. The control law demonstrates significant reduction of normal acceleration responses to turbulence as compared to the unaugmented aircraft. Preliminary evaluation of the design was performed on a nonlinear six-degree-of-freedom real time piloted simulation using a simplified propulsion system model. A detailed propulion system model was developed for use in final evaluation of the system. In the preliminary evaluation, the fixed gain design performed well over a wide range of flight conditions, from landing approach to supersonic high altitude cruise. Plans for further evaluation of the design using the detailed engine model and for enhancement of the control law with additional propulsion controls are presented.

Optimization of Design and Operational Parameters Using Genetic Algorithm for a Spark Ignition Engine With CNG/H2 Mixtures

2005 ◽  
Author(s):  
G. Anand ◽  
R. Balamurugan
Keyword(s):  
Genetic Algorithm ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Nox Emissions ◽  
Engine Fuel ◽  
Operational Parameters ◽  
Si Engine ◽  
Engine Efficiency ◽  
Wide Range

The present contribution describes the potential of using gaseous fuels like Hythane (CNG/H2 mixtures) as a spark ignition (SI) engine fuel. Genetic Algorithm (GA) is used to optimize the design and operational parameters of a CNG/H2 fueled spark ignition engine for maximizing the engine efficiency subjected to NOx emission constraint. This research deals with quasi-dimensional, two-zone thermodynamic simulation of four-stroke SI engine fueled with CNG/H2 blended fuel for the prediction of the combustion and emission characteristics. The validity of the model has been carried out by comparing the computed results with experimental data obtained under same engine setup and operating conditions. A wide range of engine parameters were optimized using a simple GA regarding both engine efficiency and NOx emissions. The five parameters chosen were compression ratio, engine speed, equivalence ratio, H2 fraction in the fuel, and spark plug position in cylinder head. The amount of NOx emissions was being kept under the constrained value of 750 ppm (< 5 g/kWh), which is less than permissible limit for heavy-duty engines.

Effect of Biogas Composition Variations on Engine Characteristics Including Operational Limits of a Spark-Ignition Engine

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Sachin Kumar Gupta ◽  
Mayank Mittal
Keyword(s):  
Carbon Dioxide ◽  
Thermal Efficiency ◽  
Carbon Dioxide Emissions ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
Promising Alternative ◽  
Brake Thermal Efficiency ◽  
Indicated Mean Effective Pressure ◽  
Wide Range

Biogas is a promising alternative fuel to reduce the consumption of petroleum-based fuels in internal combustion (IC) engines. In this work, the effect of various biogas compositions on the performance, combustion, and emission characteristics of a spark-ignition (SI) engine is investigated. Additionally, the effect of Wobbe index (WI) of various fuel compositions was also evaluated on the operational limits of the engine. While considering a wide range of biogas compositions (including bio-methane), the percentage of carbon dioxide (CO2) (in a blend of methane and CO2) was increased from 0 to 50% (by volume). A single-cylinder, water-cooled, SI engine was operated at 1500 rpm over a wide range of operating loads with compression ratio of 8.5:1. With the increase in WI of the fuel, both low (limited by coefficient of variation (COV) of indicated mean effective pressure (IMEP)) and high (limited by pre-ignition) operating loads were decreased; however, it was found that the overall operating range was increased. Results also showed that for a given operating load, with the increase of CO2 percentage in the fuel, the brake thermal efficiency was decreased, and the flame initiation and combustion durations were increased. The brake thermal efficiency was decreased from 16.8% to 13.7%, when CO2 was increased from 0% to 40% in methane–CO2 mixture at 8 N·m load. Concerning to emissions, a considerable decrease was noted in nitric oxide, whereas hydrocarbon, carbon monoxide and carbon dioxide emissions were increased, with the increase in CO2 percentage.

Combustion anomalies detection in SI engines from exhaust pressure signal processing

2003 ◽  
Vol 217 (5) ◽  
pp. 537-546 ◽  
Author(s):  
O Chiavola
Keyword(s):  
Steady State ◽  
Engine Speed ◽  
Combustion Process ◽  
Pressure Profile ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Transient Conditions ◽  
Frequency Domains ◽  
Si Engines ◽  
Extract Information

Considerable interest exists in developing diagnosis techniques able to reveal if anomalies in the combustion process of a spark ignition engine appear. A procedure has been implemented that allows the detection of the misfire condition and then identification of the responsible cylinder. The technique is based on the monitoring of the exhaust pressure profile and on the processing of such a signal in time and frequency domains in order to extract information regarding combustion quality. In this paper, the developed method is presented and experimental results of an application are shown. Both steady-state and transient conditions are considered and the effect of different values of engine speed and load is investigated.

Numerical Simulations of a Hydrogen-Enriched Methane Fueled Spark Ignition Engine

2004 ◽  
Author(s):  
V. Matham ◽  
K. Majmudar ◽  
K. Aung
Keyword(s):  
Numerical Simulations ◽  
Alternative Fuels ◽  
Engine Speed ◽  
Current Model ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Ignition Timing ◽  
Si Engine ◽  
Gaseous Fuels ◽  
Si Engines

The use of alternative fuels such as natural gas (methane) in spark-ignition (SI) engines is beneficial to the environment as it reduces emissions of pollutants such as NOx from these engines with slight penalty on the performance. This paper investigated the use of methane and hydrogen/methane mixtures in an SI engine by numerical simulations. The numerical simulations were based on the models of finite heat release, cylinder heat transfer, pumping losses, and friction losses. Simulations were carried out to evaluate the effects of compression ratio, equivalence ratio, ignition timing, and engine speed on the performance of the SI engine. The results showed that the current model could satisfactorily predict the performance of an SI engine fueled by gaseous fuels.

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