Method for controlling a digital high-pressure pump

1. A method for controlling a digital high-pressure pump controlled by a peak and hold control signal, including a low-pressure input designed to receive a fuel, a high-pressure output designed to deliver pressurized fuel, at least one chamber designed to receive a piston, the piston being able to move and allowing the fuel in the high-pressure pump to be pressurized toward its high-pressure output, a valve including a valve head, the valve being designed to move from a first position to a second position, the second position making it possible to keep the fuel pressurized in order to be delivered into a common rail through its high-pressure output, the high-pressure pump being activated inter alia during a starting procedure of an internal combustion engine, the control method including the following consecutive steps when the internal combustion engine does not manage to start during the starting procedure:

checking external parameters of the internal combustion engine, and then whether at least one external parameter is validated;

measuring a physical parameter at the high-pressure output,

applying an electrical detachment control signal as a replacement for the electrical control signal to the high-pressure pump during the starting procedure when the physical parameter measured at the high-pressure output is less than or equal to a reference value, and

stopping the starting procedure after a given time when the physical parameter measured at the high-pressure output is greater than the reference value.

2. The method for controlling a high-pressure pump as claimed in claim 1 , wherein the checking of the external parameters of the internal combustion engine includes a check of the fuel level in a tank.

3. The method for controlling a high-pressure pump as claimed in claim 1 , wherein the checking of the external parameters of the internal combustion engine includes a check of a controller of the high-pressure pump.

4. The method for controlling a high-pressure pump as claimed in claim 1 , wherein the electrical detachment control signal is formed of an elementary electrical signal that is duplicated n times.

5. The method for controlling a high-pressure pump as claimed in claim 4 , wherein the elementary electrical signal includes a first elementary phase, a second elementary phase and lastly a third elementary phase, the first elementary phase varying between a first minimum amplitude value and a first maximum amplitude value, the second elementary phase varying between the first maximum value and a freewheeling value, the third elementary phase varying between the first freewheeling value and the first minimum amplitude value.

6. The method for controlling a high-pressure pump as claimed in claim 4 , wherein the electrical detachment control signal is applied to the high-pressure pump during at least one fuel intake phase.

7. The method for controlling a high-pressure pump as claimed in claim 4 , wherein the electrical detachment control signal is applied to the high-pressure pump during at least one fuel delivery phase.

8. The method for controlling a high-pressure pump as claimed in claim 4 , wherein the elementary electrical signal has a modifiable duration.

9. The method for controlling a high-pressure pump as claimed in claim 8 , wherein the duration has a value of 10 ms.

10. The method for controlling a high-pressure pump as claimed claim 1 , wherein the elementary electrical signal is a peak and hold signal.

11. The method for controlling a high-pressure pump as claimed in claim 2 , wherein the checking of the external parameters of the internal combustion engine includes a check of a controller of the high-pressure pump.

12. The method for controlling a high-pressure pump as claimed in claim 5 , wherein the electrical detachment control signal is applied to the high-pressure pump during at least one fuel intake phase.