System for automatically adjusting optical axis direction of vehicle headlight
US6193398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1999 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Jun 16, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q2300/22
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a vehicle headlight optical axis automatic adjusting system, a pitch angle in the longitudinal direction of a vehicle is calculated from a signal of a height sensor. Filtering corresponding to a control mode according to the acceleration is fixed and is not frequently switched unless the constant speed state of the vehicle continues for a predetermined time. The pitch angle may be calculated on the basis of the vehicle rear height value by using a prediction expression which is divided into a plurality of regions of vehicle postures according to loading conditions of an occupant load and a trunk load in correspondence with the vehicle type. The pitch angle may be updated when the vehicle enters a constant speed driving mode, i.e., stable driving mode, so that even when one trip is not finished the error is cancelled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.