Design, construction and testing of a computerized ignition circuit for an internal combustion engine

Çakmak, Nevzat
In this study, an ignition unit was designed and constructed for a new design engine with eight cylinders and sixteen pistons. The ignition coils with two high voltage outputs were used to ignite sixteen spark plugs on the system. They were driven by PIC16F628A based igniter circuits triggered with digital signals. The igniter circuits receive ignition signals in a square wave form from a main control circuit; they open or close primary voltage of the induction coils to ignite spark plugs. This main control circuit is based on PIC16F877A; and there are two of them. The duty of main control circuit is to determine ignition advance according to engine speed and cooling water temperature, and send proper ignition signals to the igniter circuits. This main control circuit receives engine speed from the other main circuit (secondary control circuit) with serial communication and reads cooling water temperature and then it reads advance value from external eeprom memory according to engine speed and temperature. The main control circuit receives cylinder position signals from the secondary control circuit and adds advance value on them to form ignition timing signals which triggers igniter circuits. The secondary control circuit reads engine speed and determines cylinder positions with two magnetic pick-ups and LM2907 circuits on a gear wheel. This gear wheel was used to simulate disks on the crank shaft of the cars, and driven with an electric motor. The ignition unit was tested for different engine speeds, and its proper working was proved.


Backflow oil transfer in internal combustion engines
Karkaç, Abdullah; Dursunkaya, Zafer; Department of Mechanical Engineering (2002)
Oil transport through the cylinder piston route has important implications in internal combustion engines. The amount of oil available affects power loss due to friction, wear of cylinder components and piston ring performance. On the other hand, it has been shown that engine oil contributes to burned and unburned hydrocarbon emissions. In this study, the flow of gas and oil through the ring end gaps were modelled. The pressure in the 2nd and 3rd inter-ring land space volumes, the gas mass flow rates at 1st...
Design and Experimental Investigation of a Wind Tunnel Gust Generator
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This work aims at developing a two-vane gust generator for a small size open-loop wind tunnel to study the unsteady aerodynamic response of lift producing test models. The focus of the study is two-fold: (1) the design of a gust generator which produces the desired gust profiles by varying the parameters such as flow speed, pitching frequency of the vanes, maximum angle of deflection of the vanes and spacing between the vanes and (2) the experimental investigation of the gust velocity profiles via particle ...
Modelling and simulation of power steering system for agricultural tractors
Gültekin, İdil İlke; Cömert, Samet A; Erkal, Gül; Ünlüsoy, Yavuz Samim; Balkan, Raif Tuna (null; 2016-10-11)
This paper presents the development of models for the hydraulic and mechanical parts of the power steering system of an agricultural tractor. The hydraulic model is built using the component blocks from the Fluids toolbox of the Matlab/Simulink platform. The hydraulic part of the model is then integrated with the mechanical model of the front axle developed using the SimMechanics toolbox. The modeling procedure of the hydraulic system, containing a steering control unit, is described. The overall model allo...
Evaluation of a 6 pole axial flux PM motor for Control Moment Gyroscope Application
Zeinali, Raza; Ertan, Hulusi Bülent (2015-09-04)
In a previous study a compact Control Moment Gyroscope (GMC) design, based on a 6-pole, axial flux (AF) motor was presented. The GMC design in that proposal was based on analytical expressions and naturally 3-D structure of the AF motor could not be fully taken into account. In this paper the designed motor is simulated using 3-D FEM solutions. The parameters of the design such as electric loading and current loading as well as the performance of the design such as phase current and the torque produced at 1...
Design optimization of variable frequency driven three-phase induction motors
Ertan, B; Leblebicioğlu, Mehmet Kemal; Simsir, B; Hamarat, S; Cekic, A; Pirgaip, M (1998-01-01)
An approach to optimize the design of three-phase induction motors for a wide speed range drive is considered. Two operating points in the speed range are taken into consideration. The problem is handled as a constrained optimization problem. An accurate model for the motor in terms of its dimensions has been developed which predicts the motor performance based on about 60 parameters of motor geometry.
Citation Formats
N. Çakmak, “Design, construction and testing of a computerized ignition circuit for an internal combustion engine,” M.S. - Master of Science, Middle East Technical University, 2012.