Gripping determination system and gripping determination method
Providing of a gripping determination system and gripping determination method enabling detecting whether or not the driver is gripping the steering device with higher accuracy. A gripping determination system that determines a gripping state of a steering device having an electrode on a part of a steering device of a vehicle, includes: an electrostatic capacitance detecting part that detects electrostatic capacitance of the electrode, a steering torque sensor that detects steering torque of the steering wheel shaft, and a determining part that determines whether or not the steering device is being gripped based on detection results of the electrostatic capacitance detecting part and the steering torque sensor.
1 . A gripping determination system that determines a gripping state of a steering device, having an electrode on a part of the steering device of a vehicle, the gripping determination system comprising:
a first detecting part for detecting electrostatic capacitance at the electrode;
a second detecting part for detecting steering torque of a steering wheel shaft; and
a determining part for determining whether or not the steering device is gripped based on the detecting results of the first detecting part and the second detecting part, wherein the steering device includes a rim part that a driver can grip and spokes extending from near a center of the steering device toward the rim part, and the electrode is provided in a base part of a spoke part, and wherein an operating part for operating on-vehicle devices is provided on the spoke part and the electrode is provided on a decorative member provided on the operating part.
2 . The gripping determination system according to claim 1 , wherein the steering device includes a rim part that a driver can grip and the electrode is provided on the rim part.
3 . The gripping determination system according to claim 1 , wherein the decorative member constitutes a peripheral part formed around the operating part.
4 . The gripping determination system according to claim 1 , further comprising:
a terminal electrically connected to the first detecting part; wherein
the electrode is formed as a conductive plating layer on the surface of a non-exposed back surface of the decorative member,
the decorative member includes a protruding part protruding toward a metal core of the steering device, and
the terminal engages with the protruding part.
5 . The gripping determination system according to claim 4 , wherein the plating layer is formed on the surface of both an exposed surface side and the non-exposed back surface side of the decorative member and the plating layer on both surfaces is electrically connected.
6 . The gripping determination system according to claim 5 , wherein the plating layer provided on the exposed surface side of the decorative member is covered with a transparent material.
7 . The gripping determination system according to claim 1 , wherein the electrode is arranged at a first position or second position or at a first position and a second position on opposite sides from the center of the steering device in the vehicle width direction of the vehicle.
8 . The gripping determination system according to claim 7 , wherein the determining part determines that the steering device is being gripped in the case that at least one of a first electrostatic capacitance according to the first position electrode, a second electrostatic capacitance according to the second position electrode, and the steering torque according to the second detecting part exceeds a threshold.
9 . The gripping determination system according to claim 7 , wherein the determining part determines that the steering device is being gripped in the case that two or more of the first electrostatic capacitance according to the first position electrode, the second electrostatic capacitance according to the second position electrode, and the steering torque according to the second detecting part exceed a threshold.
10 . The gripping determination system according to claim 1 , further comprising:
a cover part formed so as to cover a metal core of the steering device provided between the electrode and the metal core of the steering device, the electrode being provided on at least a surface that is in contact with the cover part; and
a terminal between the cover part and the electrode that can electrically connect with the electrode.
11 . A gripping determination method for using an electrode provided on a part of a vehicle steering device for determining gripping state of the steering device, comprising:
acquiring detection results from a first detecting part for detecting electrostatic capacitance of the electrode;
acquiring detection results from a second detecting part for detecting steering torque of a steering wheel shaft; and
determining whether or not the steering device is being gripped based on the detection results of the first detecting part and the second detecting part, wherein the steering device comprises a rim part that a driver can grip and spokes extending from near a center of the steering device toward the rim part, wherein the electrode is provided in a base part of a spoke part, and wherein an operating part is provided on the spoke part and the electrode is provided on a decorative member provided on the operating part.
12 . The gripping determination method according to claim 11 , wherein as viewed from a center of the steering device in the vehicle width direction of the vehicle, the electrodes are arranged at a first position or a second position or at a first position and a second position on opposite sides, and in the case that at least one of the first electrostatic capacitance according to the electrode of the first position, the second electrostatic capacitance according to the electrode of the second position, and the steering torque according to the second detecting part exceeds a threshold, the steering device is determined to be being gripped.
13 . The gripping determination method according to claim 11 , wherein as viewed from a center of the steering device in the vehicle width direction of the vehicle, the electrodes are arranged at a first position or a second position or at a first position and a second position on opposite sides, and in the case that two or more of the first electrostatic capacitance according to the electrode of the first position, the second electrostatic capacitance according to the electrode of the second position, and the steering torque according to the second detecting part exceed a threshold, the steering device is determined to be being gripped.