Integrated Hill descent / Drive optimisation / Electric Pre-Retractor Algorithm
Publication Date: 2004-Nov-26
The IP.com Prior Art Database
The concept of this invention is to create an algorithm that couples a ‘Hill Descent Control’ system (HDC) to the electric pre-retractor (ER) system. The principle of operation is that as the driver / passenger switches on the HDC system (or it engages automatically), this sends a signal to the ER ECU that engages the ER system at a low force setting which provides sufficient force to hold the driver / occupants firmly in their seats when driving off-road or on steep inclines.
Integrated Hill descent / Drive-optimisation – Electric Pre-Retractor Algorithm
Active safety systems are under development which may affect many areas of future vehicles and require greater integration into the vehicle systems. The electric pre-retractor (ER) system operates by using an electric motor to wind in seatbelt slack, triggered by a signal from a sensor system via the vehicle mulitplex system. This trigger can utilise existing multiplex (or electrical system) messages such as lateral acceleration, steering wheel angle, braking or a combination of several. It may also be triggered by a signal via the vehicle mulitplex system from a future sensor system (e.g. external sensor), or from another ECU (electronic control unit).
The force level and rate of application can also be varied according to software algorithm held on a the ER control unit. This force level in turn may be varied by external signals such as seat position. The ER system may even be disengaged altogether if there is no occupant sitting in the seat.
In addition to the safety aspects, it will be possible to integrate the ER system with comfort and support systems (e.g. activate inflatable seat bolsters and the electric retractors to hold the occupant during enthusiastic or ‘limit handling’ driving).
Description of Invention
The concept of this invention is to create an algorithm that couples a ‘Hill Descent Control’ system (HDC) to the electric pre-retractor (ER) system. The prin...