Activation system and method for passenger protection device
AssigneeDenso Corporation
InventorHisanori Miura
Life of this patent
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Abstract
An activation system for a passenger protection device comprises a pair of communication wires, a central unit for detecting currents flowing in the communication wires, and a satellite unit for varying the currents flowing in the communication wires based on output data of an acceleration detection sensor. The central unit calculates a sum of the detected currents and compares the sum with a first predetermined level to detect the output data of the sensor. The central unit also calculates a difference between the detected currents and compares the difference with a second predetermined level, thereby detecting failure in the communication wires and stopping activation of the passenger protection device.
Claims14
An activation system for a passenger protection device mounted in a vehicle, the system comprising:
- a pair of communication wires;
- a central unit connected to the communication wires for detecting currents flowing in the communication wires and controlling activation of the passenger protection device based on detected currents;
- and
- a satellite unit including a sensor and connected to the communication wires to be located away from the central unit, the satellite unit varying the currents flowing in the communication wires based on output data of the sensor,
- wherein the central unit includes a pair of current detection means connected to the pair of communication wires for detecting the currents in the communication wires, respectively, to detect the output data of the sensor based on the detected currents, and
- wherein one of the pair of current detection means is provided to detect a current, which flows from the central unit to the satellite unit through one of the pair of communication wires, and the other one of the pair of current detection means is provided to detect a current, which flows from the satellite unit to the central unit through the other one of the pair of communication wires.
An activation method for a passenger protection device mounted in a vehicle, the method comprising:
- detecting a predetermined parameter by a sensor of a satellite unit;
- varying currents flowing through communication wires between a central unit and the satellite unit in accordance with an output of the sensor;
- detecting the currents flowing in the communication wires, the currents being a first current flowing from the central unit to the satellite unit through a first one of the communication wires and a second current flowing from the satellite unit to the central unit through a second one of the communication wires;
- and
- controlling activation of the passenger protection device based on the currents.
Dependencies are inferred from the claim text.