Data recording apparatus for vehicle

• US 8,700,266 B2
• Filed: 09/13/2012
• Issued: 04/15/2014
• Est. Priority Date: 10/31/2011
• Status: Expired due to Fees

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Kiribayashi, Shinichi
• Primary Examiner(s): Black, Thomas
• Assistant Examiner(s): PAIGE, TYLER D
• Application Number:
  US13/613,682
• Publication Number:
  US 20130110354A1
• Time in Patent Office: 579 Days
• Field of Search: 701/45, 701/37, 701/33.4, 348/148
• US Class Current: 701/45
• CPC Class Codes: G01D 9/005 Solid-state data loggers
• CPC Class Codes: G01P 1/127 for acceleration values
• CPC Class Codes: G07C 5/085 using electronic data carriers

Abstract

A data recording apparatus for a vehicle equipped with an occupant protection device includes main and safing sensors for detecting acceleration of the vehicle, a temporary memory section for storing main and safing calculation values respectively calculated from detection results of the main and safing sensors, a control section for controlling the occupant protection device based on the main and safing calculation values and for determining whether a predetermined condition associated with the acceleration is satisfied, and a recording section for recording the main calculation value upon determination of the control section that the condition is satisfied. The recording section records the main calculation value for a first period before the determination and records the main calculation value for a second period after the determination. The recording section further records the safing calculation value for the second period.

Claims

1. A data recording apparatus for a vehicle equipped with an occupant protection device, the data recording apparatus comprising:

a main sensor configured to detect acceleration of the vehicle in event of a crash;

a safing sensor configured to detect the acceleration;

a temporary memory section configured to store a main calculation value and a safing calculation value for a predetermined period, the main calculation value calculated from a detection result of the main sensor, the safing calculation value calculated from a detection result of the safing sensor;

a control section configured to control activation and deactivation of the occupant protection device based on the main calculation value and the safing calculation value, the control section configured to determine whether a predetermined condition associated with the acceleration is satisfied;

a recording section configured to record the main calculation value upon determination of the control section that the condition is satisfied, the recording section recording the main calculation value obtained for a first period before the determination and recording the main calculation value obtained for a second period after the determination, and

a comparing section configured to perform a comparison between the main calculation value after the determination and the safing calculation value after the determination, wherein

the comparing section generates reliability information indicative of reliability of the main calculation value based on the comparison and causes the recording section to record the reliability information.

2. The data recording apparatus according to claim 1, wherein

each of the main calculation value the safing calculation value represents the amount of change in velocity of the vehicle, and

the comparing section generates a matching flag as the reliability information, when a difference between a maximum value of the main calculation value and a maximum value of the safing calculation value in the comparison falls within a predetermined range.

3. The data recording apparatus according to claim 1, wherein

each of the main calculation value the safing calculation value represents the amount of change in velocity of the vehicle,

the comparing section generates a matching flag as the reliability information, when a difference between a first time and a second time in the comparison falls within a predetermined range,

the first time is taken for the main calculation value to reach its maximum value after the determination, and

the second time is taken for the safing calculation value to reach its maximum value after the determination.

4. The data recording apparatus according to claim 1, wherein

each of the main calculation value the safing calculation value represents the amount of change in velocity of the vehicle,

the comparing section repeatedly performs the comparison at a predetermined interval for a third period after the determination, and

the comparing section generates a matching flag as the reliability information, when a difference between the main calculation value and the safing calculation value in every comparison falls within a predetermined range.

5. The data recording apparatus according to claim 1, wherein

each of the main calculation value the safing calculation value represents the amount of change in velocity of the vehicle,

the comparing section generates matching degree information as the reliability information, and

the matching degree information represents a degree of matching between a maximum value of the main calculation value and a maximum value of the safing calculation value in the comparison.

6. The data recording apparatus according to claim 1, wherein

each of the main calculation value the safing calculation value represents the amount of change in velocity of the vehicle,

the comparing section generates matching degree information as the reliability information,

the matching degree information represents a degree of matching between a first time and a second time in the comparison,

the first time is taken for the main calculation value to reach its maximum value after the determination, and

the second time is taken for the safing calculation value to reach its maximum value after the determination.

7. The data recording apparatus according to claim 1, wherein

each of the main calculation value the safing calculation value represents the amount of change in velocity of the vehicle,

the comparing section repeatedly performs the comparison at a predetermined interval for a third period after the determination,

the comparing section generates a matching degree information as the reliability information based on whether a difference between the main calculation value and the safing calculation value in every comparison falls within a predetermined range, and

the matching degree information represents a degree of matching between the main calculation value and the safing calculation value.

8. The data recording apparatus according to claim 1, wherein

each of the main calculation value the safing calculation value represents the amount of change in velocity of the vehicle,

the comparing section generates a matching flag as the reliability information, when a difference between a maximum value of the main calculation value and a maximum value of the safing calculation value in the comparison falls within a first range, and a difference between a first time and a second time in the comparison falls within a second range,

the first time is taken for the main calculation value to reach its maximum value after the determination, and

the second time is taken for the safing calculation value to reach its maximum value after the determination.

9. The data recording apparatus according to claim 2, wherein

the reliability information includes at least one of the maximum value of the main calculation value and a time taken for the main calculation value to reach its maximum value after the determination.