Automotive air conditioning system
US4834283A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1988 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Jul 20, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60H1/00835
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A damper position control device for an automotive air conditioning system having a lock release mechanism for the drive shaft of a motor which controls the angular position of an air mix damper. A damper position control device is disclosed which controls the angular position of an air mix damper. The damper position control device includes a motor actuator which drives the air mix damper and a control circuit. The motor actuator includes a drive motor for the air mix damper and a rotation control device including a regulator which regulates the upper and lower rotational limits of the shaft of the drive motor and a position detector which detects the rotational angle of the shaft. The control circuit controls the motor actuator in accordance with a plurality of detected signals. The control circuit generates a drive signal which drives the motor actuator and further includes a lock detector which detects if the shaft of the motor is locked against rotational motion in a first rotational direction. The control circuit also includes a lock release which releases the motor so as to permit rotational motion in a second rotational direction after the motor as been locked against rotat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.