Denso Corporation

Mitsugi Ootsuka

Noriaki Okada

Munenori Matsumoto

Akihiro Taguchi

Nobuyoshi Nagai

Masahiro Sugiura

Hiromichi Naitoh

Hironori Katoh

When a demodulated signal of a radio signal in Chtransmitted from a TPMS transmitter is acquired, a control IC controls the frequency of a signal inputted from a PLL circuit to a mixer into a frequency for converting a TPMS radio signal into an intermediate frequency signal of a specific frequency. When the demodulated signal of the radio signal transmitted from a portable unit through two frequency channels is acquired, the control IC determines a channel whose state of communication is favorable from between Chand Ch, and controls the signal frequency for conversion into a frequency for converting a keyless radio signal in the determined channel into an intermediate frequency signal.

Vehicle control system

A wireless key includes a receiver circuit that operates with a built-in battery, and receives a polling radio wave for wireless key search and authentication from a vehicle, and a transmitter circuit that transmits a lock operation radio wave to a door based on the manipulation on a manipulation device. The wireless key is capable of changing over operation mode between a power saving mode that permits the operation of transmitting the lock operation radio wave by the transmitter circuit and stops the operation of receiving the polling radio wave by the receiving circuit, and a full power mode that permits the operation of transmitting the lock operation radio wave by the transmitter circuit and continues the reception by the receiver circuit.

Wireless key and door remote control system

Growing community of inventors

Kariya, Japan

Mitsugi Ootsuka