Automatic headlight axis direction control for vehicles
US6729749B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2001 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Nov 8, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q2300/132
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A DC motor is driven with a predetermined driving signal thereto before a headlight axis direction control is started by using a headlight axis control angle calculated on a basis of a variety of sensor information and a positional signal from a potentiometer. If there is no variation in the positional signal, a failure in the driving system of the DC motor is decided to exist. Therefore, for example, if failure detection is implemented when an ignition switch to start an engine is turned on, the failure in the driving system of the DC motor is detected before the headlight needs to be turned on. Thereby, reliability in the system for headlight axis direction control is able to be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.