| 摘要 |
There is provided a keyless entry system that can determine whether a portable device is either inside or 5outside a vehicle using communication via a human body by a simple system. Communication is performed between a vehicle-side device provided in a vehicle and a portable device. The vehicle includes a detector that detects a person's action of getting off the vehicle. The portable 10device has a portable device controller that performs communication of a signal for authentication, and a portable device electrode that makes an electric field induced in a human body by the signal The vehicle-side device has a vehicle-side electrode 15 that detects the electric field induced in the human body by the portable device electrode, and a vehicle-side controller that demodulates a signal from an electric field detected by the vehicle-side electrode, and authenticates the signal. When the person's action of 20getting off a vehicle has been detected by the detector, the vehicle-side controller determines that the portable device has been left in the vehicle if the vehicle-side controller has no history of authentication of the portable device, and then makes the device provided in 25the vehicle perform a predetermined operation. |
