Power apparatus for diagnosing air bag equipment
First Claim
1. An apparatus for diagnosing faults in an air bag equipment mounted on a vehicle and having a battery, an ignition key switch connected to the battery, sensing means for sensing the condition for operating the air bag equipment, and fault detection means for detecting a fault occurring in the sensing means and for producing a fault detection signal, comprising:
- a central processing unit for determining a first fault occurrence and for producing a first fault occurrence signal in response to the fault detection signal; and
control means for applying a power of the battery to said central processing unit in dependency on closing the ignition switch before the faults occur and for maintaining to apply the power of the battery to said central processing unit regardless the conditions of the ignition switch in response to said first fault occurrence signal.
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Accused Products
Abstract
There is disclosed a power apparatus for diagnosing on air bag equipment, which includes a central processing unit (CPU) having a clock circuit and diagnoses errors and faults occurring in the air bag equipment in order to detect and store error postion, time and condition occurred. The power apparatus comprises a battery circuit for directly connecting a battery and the CPU in order to supply with power of the CPU, an ignition switch circuit for supplying the CPU with the power through an ignition switch, and a changeover control unit for changing a power line in the manner of supplying the CPU with the power through the ignition switch circuit when the engine starts for the first time after delivery, and for supplying the CPU with the power through the battery circuit after failure occurs.
28 Citations
11 Claims
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1. An apparatus for diagnosing faults in an air bag equipment mounted on a vehicle and having a battery, an ignition key switch connected to the battery, sensing means for sensing the condition for operating the air bag equipment, and fault detection means for detecting a fault occurring in the sensing means and for producing a fault detection signal, comprising:
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a central processing unit for determining a first fault occurrence and for producing a first fault occurrence signal in response to the fault detection signal; and control means for applying a power of the battery to said central processing unit in dependency on closing the ignition switch before the faults occur and for maintaining to apply the power of the battery to said central processing unit regardless the conditions of the ignition switch in response to said first fault occurrence signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification