US 10,894,519 B2 · Vehicle switch control device and switch state detection method

Abstract

Provided is an integrated circuit (41) that operates in normal mode or sleep mode corresponding to the on/off state of a vehicle engine. On the basis of information of setting data information stored in an internal register (42) and information of the on/off state of the vehicle engine from an MPU (50), the integrated circuit (41) generates monitoring signals (INZ0 to INZ7), monitoring signals (INA0 to INA7), and monitoring signals (INB0 to INB5). These monitoring signals enables to monitor states of a head light switch (11), a door switch (12), and a window switch (13). As the switch state monitoring method, intermittent operation or constant monitoring operation is performed.

Claims10

Dependent claims

A switch state detection circuit arranged to detect states of a plurality of switches in a vehicle including an engine, the detection circuit comprising:

a plurality of switch current sources corresponding to the plurality of switches, respectively;
and
an integrated circuit arranged to determine an on/off state of the engine, to operate in a normal mode in which the plurality of switch current sources are intermittently turned on so that the states of the plurality of switches are detected at a first period when the engine is determined to be turned on, and to operate in a sleep mode in which the plurality of switch current sources are intermittently turned on so that the states of the plurality of switches are detected at a second period when the engine is determined to be turned off.

A switch state detection method for detecting states of a plurality of switches in a vehicle including an engine, the method comprising the steps of:

determining an on/off state of the engine;
detecting the states of the plurality of switches at a first period by supplying currents from a plurality of switch current sources to the plurality of switches when the engine is determined to be turned on;
and
detecting the states of the plurality of switches at a second period by supplying currents from the plurality of switch current sources to the plurality of switches when the engine is determined to be turned off.

1 more element

Dependencies are inferred from the claim text.

Vehicle switch control device and switch state detection method

Life of this patent

Vehicle switch control device and switch state detection method

Life of this patent

Abstract

Claims10