Communication system for a passenger protection system
First Claim
1. A communication device for a passenger protection system comprising:
- an ECU configured to control a passenger protection device, which protects a passenger at time of vehicle collision and the ECU including a failure check unit and a memory unit; and
a plurality of sensor units connected to the ECU in a daisy chain form configured to detect acceleration of the vehicle and transmitting acceleration signals to the ECU,wherein the sensor units, after being initialized by setting of respective set addresses in correspondence to address setting instructions of the ECU, transmit respective set address and respective characteristic information to the ECU,the memory unit of the ECU stores the characteristic information as correspondence information, such that the characteristic information of a given sensor unit is associated with the set address of the given sensor unit, andthe failure check unit compares the characteristic information transmitted from the sensor units with the correspondence information with respect to each of the set addresses, if the characteristic information are stored in the memory unit, and the failure check unit determines that the given sensor unit has failedwhen the characteristic information received is different than the correspondence information stored in the memory unit, andthe characteristic information for the sensor units are a fixed identifier and are different for each of the sensor unitseach of the plurality of sensor units includes a first memory and a second memory, and stores the set address in the first memory and stores the characteristic information in the second memory, the set address is set in correspondence to an address setting instruction of the ECU during initialization, the address setting instruction is designated in an order of the daisy chain connection of the plurality of sensor units,the sensor units, after being initialized, transmit respective set address and respective characteristic information to the ECU as paired information, andthe failure check unit compares the characteristic information transmitted in pairs from the sensor units with each of the set addresses stored in the memory unit.
1 Assignment
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Accused Products
Abstract
In each sensor unit, when a sensor control unit cannot detect current flowing to an output side, its address is set to the same address as a sensor unit of the last stage. In an ECU, if the set address and characteristic information of each sensor unit are not stored in a memory unit when the set addresses and the characteristic information of all the sensor units are received by an ECU control unit, the received set addresses and the characteristic information are stored. A failure check unit checks received characteristic information received by the ECU control unit with characteristic information stored in the memory unit. If one characteristic information is in disagreement, a sensor unit having such characteristic information is determined to be failing. If plural characteristic information are in disagreement, a sensor unit having characteristic information and closest to the ECU is determined to be failing.
16 Citations
18 Claims
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1. A communication device for a passenger protection system comprising:
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an ECU configured to control a passenger protection device, which protects a passenger at time of vehicle collision and the ECU including a failure check unit and a memory unit; and a plurality of sensor units connected to the ECU in a daisy chain form configured to detect acceleration of the vehicle and transmitting acceleration signals to the ECU, wherein the sensor units, after being initialized by setting of respective set addresses in correspondence to address setting instructions of the ECU, transmit respective set address and respective characteristic information to the ECU, the memory unit of the ECU stores the characteristic information as correspondence information, such that the characteristic information of a given sensor unit is associated with the set address of the given sensor unit, and the failure check unit compares the characteristic information transmitted from the sensor units with the correspondence information with respect to each of the set addresses, if the characteristic information are stored in the memory unit, and the failure check unit determines that the given sensor unit has failed when the characteristic information received is different than the correspondence information stored in the memory unit, and the characteristic information for the sensor units are a fixed identifier and are different for each of the sensor units each of the plurality of sensor units includes a first memory and a second memory, and stores the set address in the first memory and stores the characteristic information in the second memory, the set address is set in correspondence to an address setting instruction of the ECU during initialization, the address setting instruction is designated in an order of the daisy chain connection of the plurality of sensor units, the sensor units, after being initialized, transmit respective set address and respective characteristic information to the ECU as paired information, and the failure check unit compares the characteristic information transmitted in pairs from the sensor units with each of the set addresses stored in the memory unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification