# US 12,759,455 B2 · Vehicle interior lighting system

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- Number: US 12,759,455 B2
- Document ID: US12759455B2
- Status: Granted
- Kind: B2
- Application number: 19/092,349
- Filed: 2025-03-27
- Published: 2025-10-30
- Granted: 2026-10-13
- Earliest claimed: 2024-04-26
- Assignees: Toyoda Gosei Co., Ltd.
- Applicants: Toyoda Gosei Co., Ltd.
- Inventors: Yuta Miyagishima; Tetsuro Nishiyama; Yoshikazu Onishi
- Web page: https://patentgrep.com/patent/US12759455B2

## CPC

- B60Q 3/80: Circuits; Control arrangements (for dashboards B60Q3/16; for mass transit vehicles B60Q3/47)
- H05B 47/17: Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations
- H05B 47/18: via data-bus transmission
- B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A vehicle interior lighting system that performs LIN communication. The vehicle interior lighting system includes plural lamp units connected by a single bus cable, and a host ECU that is connected to the bus cable and controls operation of the plural lamp units. The host ECU transmits a fail-safe operation instruction signal to the plural lamp units after transmitting an operation instruction signal to the plural lamp units. The plural lamp units, when receiving the operation instruction signal properly, operate according to operation instruction information included in the operation instruction signal and ignore the fail-safe operation instruction signal and, when failing to receive the operation instruction signal properly, perform a fail-safe operation according to fail-safe operation instruction information included in the fail-safe operation instruction signal.

## Claims

### Claim 1

A vehicle interior lighting system that performs LIN communication, the vehicle interior lighting system comprising:
a plurality of lamp units connected by a single bus cable; and
a host ECU that is connected to the bus cable and controls operation of the plurality of lamp units,
wherein the host ECU transmits a fail-safe operation instruction signal to the plurality of lamp units after transmitting an operation instruction signal to the plurality of lamp units, and
wherein the plurality of lamp units, when receiving the operation instruction signal properly, operate according to operation instruction information included in the operation instruction signal and ignore the fail-safe operation instruction signal and, when failing to receive the operation instruction signal properly, perform a fail-safe operation according to fail-safe operation instruction information included in the fail-safe operation instruction signal.

### Claim 2 (depends on 1)

The vehicle interior lighting system according to claim 1, wherein after transmitting the operation instruction signal to the plurality of lamp units, the host ECU repeatedly transmits the fail-safe operation instruction signal until transmitting a next operation instruction signal.

### Claim 3 (depends on 1)

The vehicle interior lighting system according to claim 1, wherein the fail-safe operation of the plurality of lamp units is cancelled when a new operation instruction signal is received properly from the host ECU.