A closed-loop control method for a low-voltage direct current cdi igniter

Abstract

The invention relates to a closed-loop control method of a low-voltage DC CDI (Loop locked CDI, LLCDI) igniter, comprising steps: 1: setting a two-point or multi-point boost detection circuit, that is, the lowest ignition energy voltage point and the highest limited voltage point; 2: Measure the time Td for boosting the voltage to the highest limit point voltage when powering on, and load the appropriate duty cycle parameters accordingly; 3: Measure the time Ea for the boost charging voltage from zero (after the last ignition trigger) to the lowest ignition energy voltage point Point time Tp, 4: compare the measured Tp with the set standard Ts, and adjust the duty cycle of the boost signal by one (or more) duty cycle steps accordingly; 5: trigger discharge , the boost circuit starts working again; iteratively execute steps 3, 4, and 5 until the adjusted boost curve coincides with the predetermined boost curve at the highest degree, and the error between Tp and Ts is the smallest. The present invention improves the integration and efficacy of the DC CDI igniter through the series of closed-loop control methods.

Description

technical field [0001] The invention relates to a closed-loop control method of a low-voltage DC CDI igniter. Background technique [0002] At present, low-voltage DC boost igniters are widely used in the fields of small aircraft and model engines, such as the CDI igniter for small engines using battery boost ignition. Its working principle is to convert low-voltage direct current into Tens of thousands of volts of high-voltage ignition current, the first step-up (primary step-up) is to convert the low-voltage direct current into a primary high voltage of about 260-400V through the oscillation circuit, charge the energy storage capacitor, and then the capacitor passes through the thyristor high-voltage pack Discharge, so that it is converted into tens of thousands of volts of high-voltage electricity, forming a second boost, and discharging the compressed combustible gas in the cylinder, thereby pushing the piston to do work. [0003] Under the current design method, genera...

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Problems solved by technology

[0010] Further analysis, we can see that if no measures are taken, at the Ta time, the energy obtained by the OB curve (9V voltage) exceeds the minimum engine ignition energy requirement Ea, while the energy obtained by the OC curve (4V) is lower than The minimum ignition energy Ea of the engine, that is to say, as soon as the external parameter conditions change, the boost curve of the igniter will change accordingly, which cannot meet the requirements of the engine's working conditions

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