Coupling capacitance estimation method, method for identifying corresponding ends of multicore cable, and method for manufacturing multicore cable assembly

1. A coupling capacitance estimation method, comprising:

arranging numerous input electrodes so as to respectively face first exposed end portions of numerous insulated wires exposed at one end of a multicore cable;

arranging numerous output electrodes so as to respectively face second exposed end portions of the numerous insulated wires exposed at another end of the multicore cable;

performing measurement of a voltage value of a measurement output signal that is output by capacitive coupling from a second exposed end portion through an output electrode when a measurement input signal is input by capacitive coupling from an input electrode to a first exposed end portion, with a plurality of predetermined different combinations of the input electrodes to input the measurement input signal and the output electrodes to output the measurement output signal; and

based on the measured voltage values of a plurality of the measurement output signals, estimating respective coupling capacitances between the numerous input electrodes and the numerous first exposed end portions facing each other and respective coupling capacitances between the numerous output electrodes and the numerous second exposed end portions facing each other.

2. A method for identifying corresponding ends of a multicore cable that is a method for identifying correspondence relations between the numerous first exposed end portions and the numerous second exposed end portions by using the coupling capacitance estimation method according to claim 1 , the method comprising:

inputting an identification input signal by capacitive coupling from the input electrode to the first exposed end portion as an input-side identification target among the numerous first exposed end portions, also inputting an auxiliary signal with an opposite phase to the identification input signal, by capacitive coupling, from the input electrode to the first exposed end portion among the numerous first exposed end portions except the first exposed end portion as the input-side identification target, and measuring voltage values of identification output signals that are output by capacitive coupling respectively from the numerous second exposed end portions through the output electrodes;

calculating correction voltage values by multiplying respective voltage values of the identification output signals measured at the numerous second exposed end portions by a correction coefficient calculated using estimated values of coupling capacitances estimated by the coupling capacitance estimation method; and

based on the calculated correction voltage values, identifying the second exposed end portion corresponding to the first exposed end portion as the input-side identification target.

3. The method according to claim 2 , wherein the correction coefficient multiplied by the voltage value of the identification output signal is a product of a term correlated with coupling capacitance between the second exposed end portion designated to output the identification output signal and the output electrode and a term correlated with reference coupling capacitance indicating a predetermined reference value for coupling capacitances between the numerous second exposed end portions and the numerous output electrodes facing each other.

4. A method for identifying correspondence relations between first exposed end portions of numerous insulated wires exposed at one end of a multicore cable and second exposed end portions of numerous insulated wires exposed at another end of the multicore cable,

arranging numerous input electrodes so as to respectively face the first exposed end portions of the numerous insulated wires;

arranging numerous output electrodes so as to respectively face the second exposed end portions of the numerous insulated wires;

inputting an identification input signal by capacitive coupling from an input electrode to the first exposed end portion as an input-side identification target among the numerous first exposed end portions, also inputting an auxiliary signal with an opposite phase to the identification input signal, by capacitive coupling, from the input electrode to the first exposed end portion among the numerous first exposed end portions except the first exposed end portion as the input-side identification target, and measuring voltage values of identification output signals that are output by capacitive coupling respectively from the numerous second exposed end portions through the output electrodes;

inputting a measurement input signal by capacitive coupling from the input electrode to the first exposed end portion as the input-side identification target, and measuring voltage values of measurement output signals that are output by capacitive coupling respectively from the numerous second exposed end portions,

calculating correction voltage values by multiplying respective voltage values of the identification output signals measured at the numerous second exposed end portions by a correction coefficient,

wherein the correction coefficient is a product of a term correlated with an average of the voltage values of the measurement output signals respectively output from the numerous second exposed end portions when the measurement input signal is input to the first exposed end portion as the input-side identification target, and a term correlated with the voltage value of the measurement output signal output from a second exposed end portion designated to output the identification output signal when the measurement input signal is input to the first exposed end portion as the input-side identification target; and

based on the calculated correction voltage values, identifying the second exposed end portion corresponding to the first exposed end portion as the input-side identification target.

5. A method for manufacturing a multicore cable assembly that comprises a multicore cable comprising numerous insulated wires and an outer covering collectively covering the numerous insulated wires, a first connection target member electrically connected to first exposed end portions of the numerous insulated wires exposed from the outer covering at one end of the multicore cable, and a second connection target member electrically connected to second exposed end portions of the numerous insulated wires exposed from the outer covering at another end of the multicore cable, the method comprising:

identifying which of a second exposed end portion corresponds to a first exposed end portion as an input-side identification target among numerous first exposed end portions; and

based on identification results for the numerous first exposed end portions and numerous second exposed end portions by the identifying, electrically connecting the numerous first exposed end portions to the first connection target member and electrically connecting the numerous second exposed end portions to the second connection target member,

wherein the identifying comprises:

arranging numerous input electrodes so as to respectively face the numerous first exposed end portions,

arranging numerous output electrodes so as to respectively face the numerous second exposed end portions,

performing measurement of a voltage value of a measurement output signal that is output by capacitive coupling from the second exposed end portion through an output electrode when a measurement input signal is input by capacitive coupling from an input electrode to the first exposed end portion, with a plurality of predetermined different combinations of the input electrodes to input the measurement input signal and the output electrodes to output the measurement output signal,

estimating respective coupling capacitances between the numerous input electrodes and the numerous first exposed end portions facing each other and respective coupling capacitances between the numerous output electrodes and the numerous second exposed end portions facing each other based on measured voltage values of a plurality of the measurement output signals,

inputting an identification input signal by capacitive coupling from the input electrode to the first exposed end portion as the input-side identification target among the numerous first exposed end portions, also inputting an auxiliary signal with an opposite phase to the identification input signal, by capacitive coupling, from the input electrode to the first exposed end portion among the numerous first exposed end portions except the first exposed end portion as the input-side identification target, and measuring voltage values of identification output signals that are output by capacitive coupling respectively from the numerous second exposed end portions through the output electrodes,

calculating correction voltage values by multiplying respective voltage values of the identification output signals measured at the numerous second exposed end portions by a correction coefficient calculated using estimated values of the coupling capacitances, and

based on the calculated correction voltage values, identifying the second exposed end portion corresponding to the first exposed end portion as the input-side identification target.