Title:
ELECTRONIC ODOMETER APPARATUS
Document Type and Number:
Japanese Patent JP3749037
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To restrict a stop of an odometer during running by using only an EEPROM circuit, obtaining a run distance of a vehicle and enhancing a redundancy to gobbledygook. even for regular noises.
SOLUTION: A CPU circuit 2a takes and counts vehicle velocity pulses, updates run distance data of an EEPROM circuit 3a for every predetermined run distance, forms display data based on the latest run distance data, and displays a latest run distance on a display device 4. A write process part 51 carries out a write process to the EEPROM 3a by a preliminarily set first write number of times. If the write process fails even after the write process of the first write number of times, a rewrite process part 52 carries out a rewrite process with a shorter rewrite cycle than a write cycle by a preliminarily set second write number of times. When the rewrite process fails even after the rewrite process by the second write number of times, a first integration stop part 53 judges that the EEPROM circuit 3a is abnormal and stops to integrate the run distance data.
Inventors:
Etsuhisa Nagasaka
Application Number:
JP15827699A
Publication Date:
February 22, 2006
Filing Date:
June 04, 1999
Export Citation:
Assignee:
Yazaki Corporation
International Classes:
G01C22/00; G01C25/00; G06F12/16; (IPC1-7): G01C22/00; G01C25/00
Domestic Patent References:
| JP7218284A | ||||
| JP922376A | ||||
| JP5265869A |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Iwa Saki Kokuni
Akira Kurihara
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
Iwa Saki Kokuni
Akira Kurihara
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu