The authors developed an algorithm, a microprocessor system for studying the distribution of values of breakdown voltages in the gap of the spark plug. The microprocessor system includes capacitive voltage dividers and a device for processing and outputting information. The device for processing and outputting information consists of the following main blocks: peak detector, microcontroller and LCD indicator. The field studies of the microprocessor system were carried out at idle speed with the minimum engine speed of the crankshaft. A histogram of the distribution of the values of the breakdown voltage in the interelectrode gap of the spark plug is obtained. The application of this system not only in the laboratory environment, but also on the car can provide valuable information about malfunctions in the ignition system and assess the dependence of the intercycle non-identity of the engine working process on the variations of the breakdown voltage
Keywords: ignition system, spark discharge, internal combustion engine, spark plugs, breakdown voltage, microprocessor, capacitive voltage divider
The authors carried out in-situ studies of the distribution of the breakdown voltage values of the F8CV engine of the Daewoo Matiz engine with the engine warmed up and idling at the minimum crankshaft speed. A histogram of the distribution of the values of the breakdown voltage in the interelectrode gap of the spark plug is obtained for these operating modes of the internal combustion engine. It was revealed that 50-63% of all values of the breakdown voltage fall within the range 10.0-10.9 kV. When the engine warms up, 36% of all breakdown voltage values are 10 kV. The remaining 8 and 9 kV account for 50% of the values. The maximum variance of the cyclic values of the breakdown voltage is 20-40% with an average breakdown voltage of 10 kV.
Keywords: ignition system, spark discharge, internal combustion engine, spark plugs, breakdown voltage, microprocessor, capacitive voltage divider, histogram
Experimental studies of the ignition system of the engine idling. With the help of current and voltage sensors made visualization, transformation and analysis of information about the characteristics of energy spark discharge in the cylinder of the engine idling. Produced by processing waveform is shown that with increasing rotation speed of motor there is a reduction of the energy released in the electrode gap of the spark plug. Reducing the energy released (at a constant value of the energy stored in the magnetic field of the ignition coil) due to its redistribution between the capacitive and inductive discharge phases. By increasing rotation speed of motor the breakdown voltage increases, so does the excess air ratio, which also increases the breakdown voltage electrode gap spark plugs.
Keywords: ignition system, spark, spark ignition, ignition coil, motor, electrical equipment, ignition sparkplugs
Experimental studies of the ignition system to the load operation of the motor. With the help of current and voltage sensors made visualization, transformation and analysis of information about the characteristics of energy spark discharge in the cylinder at different operation modes. Produced by processing waveform is shown that with increasing rotation speed of motor is decreasing the duration of the spark discharge with an increase in the energy released in the electrode gap of the spark plug. With increasing rotation speed the release of energy takes place in a shorter period of time due to increased voltage; increasing the amount of energy by reducing the value of the breakdown voltage. However, these relationships are non-linear. On the mode of maximum torque and power discharge duration increased.
Keywords: ignition system, spark, spark ignition, ignition coil, motor, electrical equipment, ignition sparkplugs
The laboratory studies the dependence of breakdown voltage of the spark plug gap on the polarity of the high voltage generated ignition system, air density and the size of the spark plug gap. The studies were performed using the tester spark under pressure. With a resistive voltage sensor made visualization, transformation and analysis of information on the magnitude of the breakdown voltage. Produced processing waveforms shown that flashover occurs regardless of the magnitude of the gap and is determined by the rate of rise of the secondary voltage of the external shape of the electrode and insulator spark plug. To reduce the breakdown voltage should be selected polarity when the cathode is the breakdown of the central electrode of the spark plug. Reversal may allow push surface breakdown in the zone of higher pressure in the chamber of the device, albeit with an increase in the breakdown voltage of the spark gap.
Keywords: ignition system, spark, spark ignition, ignition coil, motor, electrical equipment, ignition sparkplugs, breakdown voltage