Abstract
A In the conventional ignition system, distributor is used to divide a high voltage delivered from the secondary coil to the spark plugs. This system has several weaknesses, such as the damage of contactbreaker, oil seal and carbon electrode which causes a reduction of ignition power. To overcome the problem, some vehicle manufacturers have designed the vehicle ignition system which obviates the distributor (distributorless). However distributorless system is a dual ignition system with analog power ignitor, so the system still uses analog and it is difficult to be accessed by the user (black box). While Sampurno (2007) designed a multi purpose digital distributorless, but the system was not flexible.
This paper describes a digitalized distributorless igniton system that can be programmed (programmable) and used for different vehicles (multi purpose). The system uses microprosessor AT89S51 as controller, C++ language, signal filter, the hall sensor IC and power transistor to supply amount current to the coil. To obtain a description of performance system is simulated by using software Proteus 6.2 sp4. Based on simulation result, prototype will be made by using data of Toyota and Daihatsu vehicle.The testing of prototype is conducted to determine time delay, degrees before ignition top dead center (BTDC), current and voltage at primary and secondary coil. Research result shows if the vehicle speed increases then time delay decreases, while BTDC will increase. The tendency of the system according to the need of vehicle ignition system. Current test results on the primary coil for 6A and the secondary coil 30 mA, while the primary coil voltage reaches 590 Volt and secondary coil 59 kV. The results show that the designed system is better than the distributor and analog distributorless.
Keywords: digitalized distributorless, programmable, time delay and high voltage