Self-tuning optimization of spark ignition automotive engines

1990 ◽  
Vol 10 (3) ◽  
pp. 94-101 ◽  
Author(s):  
P.G. Scotson ◽  
P.E. Wellstead
Keyword(s):  
Spark Ignition ◽  
Automotive Engines ◽  
Self Tuning

Nitric-Oxide Generation in a Simulated Spark-Ignition Engine

1971 ◽  
Vol 93 (2) ◽  
pp. 432-436
Author(s):  
J. L. Hodges ◽  
R. F. McAlevy ◽  
J. H. Potter
Keyword(s):  
Nitric Oxide ◽  
Air Pollution ◽  
Spark Ignition ◽  
Ultraviolet Absorption ◽  
Spark Ignition Engine ◽  
Mechanical Analog ◽  
Automotive Engines ◽  
Product Gas ◽  
Absorption Technique

Nitric oxide emitted from the exhaust of spark-ignition automotive engines has long been recognized as a contributor to air pollution. A mechanical analog for the spark-ignition engine was designed, instrumented, and tested. Product gas concentrations of nitric oxide were monitored in the analog, using an ultraviolet absorption technique. Nitric oxide concentrations were found to be independent of the rate at which product gases were expanded.

Modifications to Improve Fuel Consumption in the Remanufacture of Spark-Ignition Engines for Electric Generators

2016 ◽  
Vol 138 (12) ◽  
Author(s):  
Matthew Neill Swain ◽  
Oliver Patrick Jordan ◽  
Travis Jamal Mackey ◽  
Patrick Shannon Seemann ◽  
Hasitha Samarajeewa ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Spark Ignition ◽  
Friction Reduction ◽  
Phase Iii ◽  
Test Cycle ◽  
Power Sources ◽  
Automotive Engines ◽  
Electric Generators

This paper describes the development of a water-cooled, lean burn, gaseous fueled engine designed for distributed power installations. Electric generators have become popular because they provide a portable supply of electrical power at consumer demand. They are used in critical need areas such as hospitals and airports, and have found their way into homes frequented with power outages or homes in remote locations. Gensets are available in a wide variety of sizes ranging from 1 kilowatt (kW) to thousands of kilowatts. In the midrange, the power sources are typically spark-ignition, automotive type internal combustion engines. Since engines designed for automotive use are subject to different emission regulations, and are optimized for operation at revolutions per minute (RPM) and brake mean effective pressures (BMEPs) above that of electric generator engines, modifications can be made to optimize them for gensets. This work describes modifications which can be made during remanufacturing an automotive engine to optimize it for use as a generator engine. While the work recognizes the potential for cost savings from the use of remanufactured automotive engines over that of using new automotive engines and the majority of the design constraints were adopted to reduce engine cost, the main focus of the work is quantifying the increase in fuel efficiency that can be achieved while meeting the required EPA emission requirements. This paper describes the seven combustion chamber designs that were developed and tested during this work. Friction reduction was obtained in both valve train and journal bearing design. The engine optimized for fuel efficiency produced a maximum brake thermal efficiency (BTE) of 37.5% with λ = 1.63. This yielded an EPA test cycle average brake specific fuel consumption (BSFC) of 325 g/kW hr. Modification of the spark advance and low load equivalence ratio to meet EPA Phase III emission standards resulted in an EPA test cycle average BSFC of 330 g/kW hr. When the engine used in this research was tested in its unmodified, automotive configuration under the EPA compliant test cycle, its EPA test cycle average BSFC was 443.4 g/kW hr. This is a 34% increase in fuel consumption compared to the modified engine.

Effect of Compression Ratio on Performance of a Four-Stroke Spark-Ignition Engine - A Theoretical and Experimental Study

2014 ◽  
Vol 984-985 ◽  
pp. 945-949
Author(s):  
Vijayashree ◽  
P. Tamil Porai ◽  
N.V. Mahalakshmi ◽  
V. Ganesan
Keyword(s):  
Compression Ratio ◽  
Power Efficiency ◽  
Theoretical Work ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Performance Improvements ◽  
Automotive Engines ◽  
Speed Range ◽  
Modelling Techniques ◽  
Experimental And Theoretical Studies

Researchers strive to improve the performance characteristics such as power, thermal efficiency, mean effective pressure etc. of automotive engines. As the emission norms are becoming stringent day by day, the car manufacturers try their best to decrease the emissions and improve the performance without major compromise on performance. Improvements in the performance of an engine are can be achieved by increasing the compression ratio below detonating values. In this study influence of compression ratio on cylinder peak pressure, power, efficiency, and work for a four-stroke spark-ignition engine is reported. Both experimental and theoretical studies have been undertaken. Theoretical work is carried out using thermodynamic modelling techniques. Compression ratios ranging between 6.3 and 10.3 are considered in the speed range of 1200 and 2800 rpm. Experiments have been carried out on a single cylinder engine for a compression of 8.3 over the above speed range. The investigation is carried out particularly at such low speeds since in city driving the vehicles run only at part throttle in the above range of engine speed. The general conclusion is that the increase in compression ratio increases the performance.

The cam profile switching state detection method

2005 ◽  
Vol 219 (12) ◽  
pp. 1495-1497 ◽  
Author(s):  
A Stotsky
Keyword(s):  
Detection Method ◽  
Spark Ignition ◽  
Bank Failure ◽  
Intake Manifold ◽  
Automotive Engines ◽  
Crank Angle ◽  
State Detection ◽  
Cam Profile ◽  
Intake Manifold Pressure ◽  
Switching State

A new method for the detection of the CPS (cam profile switching) state of spark ignition automotive engines is proposed and implemented. The method is based on the evaluation of the amplitude and the phase of the component of the intake manifold pressure signal with the period of 720 CA (crank angle) degrees. The method permits the detection of the CPS bank failure even at high rotational speeds.

An Investigation of Supercharged Air Filter System on the Performance of a Spark Ignition Engine

2013 ◽  
Vol 465-466 ◽  
pp. 443-447
Author(s):  
Shukri Zain ◽  
Shaari M. Fazri
Keyword(s):  
Fuel Consumption ◽  
Engine Performance ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Air Filter ◽  
Brake Thermal Efficiency ◽  
Engine Torque ◽  
Automotive Engines ◽  
Brake Mean Effective Pressure ◽  
Air Intake

Considering the enhancement device for air intake systems have been widely available in the market for automotive engines, in this paper, the effect of Supercharged Air Filter (SAF) system on a Spark Ignition (SI) engine were experimentally investigated. Three different types of air filter; standard, conical shape air filter and SAF were tested on a four-stroke single-cylinder engine. The engine was coupled to a 20kW generator dynamometer to measure engine performance parameters; engine torque, engine power (B.P), brake thermal efficiency (BTE), brake specific fuel consumption (BSFC) and brake mean effective pressure (BMEP) at various engine speeds with maximum engine load. The results show that the forced induction system can affect the engine performance but it will make the engines fuel consumption higher than standard system.

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