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1. (WO2019030545) INTEGRATED MOTOR RETRACTOR (IMR) WITH MOTION PROFILES
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Claims

X. Active restraint system (1), comprising:

a seat belt retractor (3), having

a frame (2) and a belt reel (4) with a belt webbing (10) wound thereon and rotatable supported by the frame (2) for allowing winding and unwinding the belt webbing (10), an electric disc motor (28) comprising a rotor (30) and a stator (32), the rotor (30) being directly attached by an attachment (31) to the belt reel (4), and

a control unit (40) connected to the disc motor (28) and adapted to control the disc motor (28) to drive the belt reel (4) in accordance with a determined belt motion profile.

2. The active restraint system according to claim 1 , comprising a belt reel position sensor for measuring the rotational position of the belt reel, wherein the control unit is connected to the belt reel position sensor and is adapted to determine the belt motion profile based on the measured belt reel position.

3. The active restraint system according to claim 1 or 2, comprising a belt reel velocity sensor for measuring the rotational velocity of the belt reel, wherein the control unit is connected to the belt reel velocity sensor and adapted to determine the belt motion profile based on the measured belt reel velocity.

4. The active restraint system according to any of the preceding claims, comprising a belt reel torque sensor for measuring a torque applied on the belt reel by means of the belt webbing, wherein the control unit is connected to the belt reel torque sensor and adapted to determine the belt motion profile based on the measured belt reel velocity.

5. The active restraint system according to any of the preceding claims, wherein the control unit is connected to a vehicle control system and adapted to determine the belt motion profile based on at least one sensor value received from the vehicle control system.

6. The active restraint system according to any of the preceding claims, wherein the control unit comprises a memory unit in which a plurality of predefined belt motion profiles are stored, and wherein the control unit is adapted to determine the belt motion profile by electing the belt motion profile from the stored plurality of predefined belt motion profiles.

7. The active restraint system according to any of the preceding claims, wherein the control unit comprises a memory unit in which a plurality of predefined parameters are stored, and a calculating unit for calculating the belt motion profile based on at least one of the stored parameters.

8. The active restraint system according to any of the preceding claims, comprising a load limiter for limiting the belt webbing load in a crash situation, wherein the control unit is adapted to control the disc motor such that substantially the whole range of the load limiter is consumed.

9. The active restraint system according to any of the preceding claims, wherein in a crash situation the control unit is adapted to control the motor after a first impact to tighten the belt.

10. The active restraint system according to any of the preceding claims, comprising a mechanical blocking unit with a mechanical vehicle sensor, and a deactivation device for deactivating the vehicle sensor.

11. The active restraint system according to claim 10, wherein the blocking device comprises a solenoid for engaging a moving member of the vehicle sensor.

12. A method for controlling an active restraint system according to claim 1, comprising the steps:

- receiving at the control unit a signal representing a first condition;

- determining a first belt motion profile; and

- controlling the disc motor such that the belt reel is moved according to the first belt motion profile.

13. The method according to claim 12, wherein the step of determining the first belt motion profile comprises: selecting the first belt motion profile from a set of stored belt motion profiles.

14. The method according to claim 12 or 13, wherein the first condition is a vehicle condition.

15. The method according to claim 12, 13 or 14, wherein the first condition is a passenger condition.

16. The method according to any of claims 12 to 15, further comprising the steps: receiving at the control unit a signal representing a second condition;

- determining a second belt motion profile; and

- controlling the disc motor such that the belt reel is moved according to the second belt motion profile.

17. The method according to any of claims 12 to 16, further comprising the steps:

- detecting a first impact in a crash situation; and

- controlling the disc motor such that the belt is tightened after the first impact.