Method for detecting the intention to lock or unlock a vehicle door and associated detecting device

A method for detecting intention to lock or unlock a motor vehicle door, performed by a detection device (D) comprising at least a first inductive sensor (A1), comprising a first target (20), an oscillating circuit (M1) comprising a coil (B), measuring means for measuring a resonant frequency of said circuit (M2), and a printed circuit (10), said method comprising:

• fitting the detection device (D) beforehand with a second inductive sensor (A2) comprising:
• a second target (30) in the form of a loop, such that a first end (E1) of the loop is connected to a fixed potential, and a second end (E2) of the loop is connected to switching means (S1) having two states:
• in a first state (P1), the second end (E2) of the loop is connected to said fixed potential,
• in a second state (P2), the second end (E2) of the loop is connected to a floating potential,
• control means (M3) for controlling the switching means (S1),
• the coil (B) of the first inductive sensor (A1) being common to the second inductive sensor (A2),
• positioning the switching means (S1) in the second state (P2) and performing a first measurement (N1) of an actual resonant frequency of the circuit (M1),
• positioning the switching means (S1) in the first state (P1) and performing a second measurement (N2) of an actual resonant frequency of the circuit (M1),
• calculating the measured difference (ΔN) between the second measurement (N2) and the first measurement (N1),
• comparing the first measurement (N1) with a first threshold (Th1),
• if the first measurement (N1) is greater than a first threshold (Th1), then
• comparing the measured difference (ΔN) with a second threshold (Th2),
• if the measured difference (ΔN) is greater than a second threshold (Th2), then detection is confirmed on the two inductive sensors (A1, A2), otherwise it is confirmed on the first inductive sensor (A1),
• otherwise, if the first measurement (N1) is less than the second threshold (Th1), then:
• comparing the measured difference (ΔN) with a second threshold (Th2),
• if the measured difference (ΔN) is greater than a second threshold (Th2), then detection is confirmed on the second inductive sensor (A2), otherwise no detection is confirmed.