Vehicular information storage device and power outage-resistant storage system and method for the same

• US 5,745,864 A
• Filed: 10/03/1995
• Issued: 04/28/1998
• Est. Priority Date: 10/04/1994
• Status: Expired due to Fees

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Yamamoto, Toshihisa, Itoh, Teruyoshi, Hosoe, Katsuharu
• Primary Examiner(s): NGUYEN, TAN QUANG
• Application Number:
  US08/538,234
• Time in Patent Office: 938 Days
• Field of Search: 364/424.04, 364/424.034, 340/438, 340/439, 73/117.3
• US Class Current: 701/35
• CPC Class Codes: G07C 5/085 using electronic data carriers

Abstract

A vehicular information storage device includes an EEPROM, an extracting device which processes and extracts vehicle information, a determination device which determines from among regions set beforehand the region of the extracted information, and a counting device for incrementing a counter in correspondence with the region determined by the determination device. The needed information is extracted properly at a predetermined period along with the determination of the region where such information belongs. Further, the EEPROM used by the system is composed of three data regions with all three data regions set to a reset state at an initial state. The data regions are decremented sequentially at a minimum period required by a measurement parameter. Since updating from "1" to "0" is possible for individual cells and there is no need for resetting, processing time is reduced. Also, when data in one of the data regions is determined to be irregular due to, e.g., a power outage, it can be restored using the count values of the two other data regions.

Claims

1. A vehicular information storage device comprising:

storage means for storing information therein and retaining said stored information even during electric power cut-off;

extracting means for processing information needed for analysis and maintenance of vehicular and internal combustion engines, said processed information relating to a predetermined period of time, and for extracting said information at a predetermined time interval;

determining means for determining from among regions set beforehand a region of information to which information extracted by said extracting means belongs;

counting means for incrementing a counter in a predetermined storage region of said storage means in correspondence with a region determined by said determining means; and

data restoration means for restoring a count value of said counter in said predetermined storage region based on count values of other storage regions after an irregularity is determined in data of said predetermined region through comparison of data stored in said storage regions.

2. The device of claim 1 wherein said extracting means is for extracting one of maximum and minimum values of said processed information within said predetermined time interval.

3. The device of claim 1 wherein said determining means is for determining a storage region based on an amount of change in information within said predetermined period of time.

4. An internal combustion engine operational history storage device which measures time using an EEPROM, said device comprising:

at least three data regions in said EEPROM to store data for a measurement item;

counting means for counting data stored in said data regions;

data computing means for processing as measured data a total of data counted by said counting means and stored in said data regions; and

data restoration means for restoring a count value for a first data region based on count values of other data regions after an irregularity is determined in data of said first data region through comparison of data stored in said data regions.

5. The device of claim 4 wherein said counting means is for performing countdown operations starting from a reset state of said EEPROM with said reset state as an initial state.

6. The device of claim 5 wherein, during countdown operations, said counting means is for determining whether there is a need to reset said EEPROM and performs resetting only when needed.

7. The device of claim 5 wherein said counting means omits resetting operations and performs resetting operations during alternating operations.

8. The device of claim 4 wherein said counting means is for performing countdown operations starting from a reset state of said EEPROM with said reset state as an initial state.

9. The device of claim 8 wherein, during countdown operations, said counting means is for determining whether there is a need to reset said EEPROM and performs resetting only when there is a need.

10. The device of claim 8 wherein said counting means omits resetting operations during odd-numbered operations and performs resetting operations during even-numbered operations.

11. An automotive data acquisition system comprising:

extracting means for processing and extracting information needed for analysis and maintenance of vehicular and internal combustion engines at a predetermined time interval, said information relating to a predetermined period of time;

a first memory for storing data therein;

determining means for determining which of a plurality of predetermined categories to which said extracted information belongs;

first modifying means for modifying data in a predetermined storage region of said first memory, said predetermined storage region corresponding to one of said predetermined categories to which said extracted information belongs, said first modifying means including counting means for incrementing a counter in correspondence with a category determined by said determining means; and

restoration means for restoring a count value for said predetermined storage region based on count values of other storage regions after an irregularity is determined in data of said predetermined storage region through comparison of data stored in said storage regions.

12. The system of claim 11, wherein:

said system includes first timer means for timing a first predetermined time period, said extracting means being responsive to said first timer means;

said determining means includes comparison means for comparing said extracted information to previously extracted information; and

said predetermined categories are representative of normal and abnormal states of an automobile engine.

13. The system of claim 11, further comprising:

second timer means for timing a second predetermined time period;

a second memory for storing data therein;

second modifying means for, responsive to said second timer means, modifying data in said second memory based on data in said first memory.

14. A vehicular information storage device comprising:

storage means for storing information therein and retaining said stored information even during electric power cut-off;

extracting means for processing information needed for analysis and maintenance of vehicular and internal combustion engines, said processed information relating to a predetermined period of time, and for extracting said information at a predetermined time interval;

determining means for determining from among regions set beforehand a region of information to which information extracted by said extracting means belongs;

counting means for incrementing a counter in a predetermined storage region of said storage means in correspondence with a region determined by said determining means, for omitting resetting said storage means during a first set of operations, said first set of operations being one of odd-numbered operations and even-numbered operations, and for resetting said storage means during a second set of operations, said second set of operations being the other of said odd-numbered operations and said even-numbered operations.

15. An internal combustion engine operational history storage device which measures time using an EEPROM, said device comprising:

at least three data regions in said EEPROM to store data for a measurement item;

counting means for counting data stored in said data regions, for resetting said EEPROM during a first set of operations, said first set of operations being one of odd-numbered operations and even-numbered operations, and for omitting resetting of said EEPROM during a second set of operations, said second set of operations being the other of said odd-numbered operations and said even-numbered operations; and

data computing means for processing as measured data a total of data counted by said counting means and stored in said data regions.

16. The device of claim 15 wherein said counting means is for performing countdown operations starting from a reset state of said EEPROM with said reset state as an initial state.

17. The device of claim 16, wherein, during countdown operations, said counting means is for determining whether there is a need to reset said EEPROM and performs resetting only when needed.

18. The device of claim 16 wherein said counting means omits resetting operations and performs resetting operations during alternating operations.

19. The device of claim 15, further comprising:

data restoration means for restoring a count value for a first data region based on count values of other data regions after an irregularity is determined in data of said first data region through comparison of data stored in said data regions.

20. The device of claim 19 wherein said counting means is for performing countdown operations starting from a reset state of said EEPROM with said reset state as an initial state.

21. The device of claim 20 wherein, during countdown operations, said counting means is for determining whether there is a need to reset said EEPROM and performs resetting only when there is a need.

22. An automotive data acquisition system comprising:

extracting means for processing and extracting information needed for analysis and maintenance of vehicular and internal combustion engines at a predetermined time interval, said information relating to a predetermined period of time;

a first memory for storing data therein;

determining means for determining which of a plurality of predetermined categories to which said extracted information belongs;

first modifying means for modifying data in a predetermined storage region of said first memory, said predetermined storage region corresponding to one of said predetermined categories to which said extracted information belongs, said first modifying means including counting means for incrementing a counter in correspondence with a category determined by said determining means, for omitting resetting said first memory during a first set of operations, said first set of operations being one of odd-numbered operations and even-numbered operations, and resetting said first memory during a second set of operations, said second set of operations being the other of said odd-numbered operations and said even-numbered operations.