Electronic turn signal cancellation apparatus
US4638290A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1985 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | May 22, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q1/40
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electronic turn signal cancellation apparatus is disclosed which includes two separate rotational positions sensing elements, each sensing an associated identifying portion positioned on a shaft rotated in accordance with vehicle steering wheel rotation. An electronic turn signal cancellation circuit, which may be effectively implemented by a microprocessor, effectively analyzes the output signals of these sensors and determines the current angular shaft position and also the previous shaft position. Turn signal cancellation is implemented by determining current shaft position and the direction of rotation of the shaft. One embodiment implements turn signal cancellation without hysteresis, while a second embodiment utilizes similar structure to implement turn signal cancellation with hysteresis. In each case only two sensors are utilized which may be joined together to form a unitary sensor assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.