Method for controlling the duty cycle of a signal enabling the current control of a conversion module of a converter

A method for regulating a duty cycle of a controlled current signal (Imes) of a conversion module (310-1) of a DC-to-DC voltage converter (310) of a control computer (30) for controlling a combustion engine (20) of a motor vehicle (1), said combustion engine (20) comprising fuel injectors (210), said control computer (30) comprising a microcontroller (300), the DC-to-DC voltage converter (310) and a control module (320) for controlling the fuel injectors (210), said DC-to-DC voltage converter (310) comprising:

• the conversion module (310-1), configured to convert a DC voltage delivered by a power supply battery (10) of the motor vehicle (1) into a DC output voltage (Vs) of higher value delivered to the control module (320) for controlling the fuel injectors (210) by generating the controlled current signal (Imes),
• a current control module (310-2) configured to control said controlled current signal (Imes) of the conversion module (310-1), said controlled current signal (Imes) exhibiting an alternation of phases of peaks of positive amplitude, allowing the conversion module (310-1) to be controlled so that it delivers power allowing a target output voltage of the DC-to-DC voltage converter (310) to be reached, and of phases of rest during which the value of said controlled current signal (Imes) is zero, thus defining the envelope of the controlled current signal (Imes), a peak phase followed by a consecutive rest phase constituting a cycle and the ratio of the duration of a peak phase to the duration of the corresponding cycle constituting the duty cycle of the envelope of the controlled current signal (Imes) at a given time,
• said method comprising:
• a step (E1) of measuring, by means of the microcontroller (300), the duty cycle of the envelope of the controlled current signal (Imes),
• when the value of the duty cycle is lower than a predetermined threshold, a step (E2A) of controlling, by means of the microcontroller (300), the current control module (310-2) so that said current control module (310-2) decreases the amplitude of the controlled current signal (Imes) and that the duty cycle of the envelope of said controlled current signal (Imes) thus tends toward said predetermined threshold,
• when the value of the duty cycle is higher than said predetermined threshold, a step (E2B) of controlling, by means of the microcontroller (300), the current control module (310-2) so that said current control module (310-2) increases the amplitude of the controlled current signal (Imes) and that the duty cycle of the envelope of said controlled current signal (Imes) thus tends toward said predetermined threshold.