Data backup apparatus utilized in an electronic control system and

53 Pages·2013·3.87 MB·English

USOO5668726A
United States Patent [19]
[11] Patent Number: 5,668,726
Kondo et al. [45] Date of Patent: Sep. 16, 1997 I
[54] DATA BACKUP APPARATUS UTILIZED IN 4-55927 2/1992 Japan .
AN ELECTRONIC CONTROL SYSTEM AND 4153312 5/ 1992 Japan -
DATA BACKUP METHOD PERFORMED [N 5143468 6/1993 Japan
THE DATA BACKUP APPARATUS 5443470 6/1993 Jaim
[75] Inventors: Hiroshi Kondo, Anjo; Takamasa OTHER PUBLICATIONS
Oguri, Toyoake; Masato Yano. IBM Technical Disclosure Bulletin. vol. 21. No. 9, Feb.
Okazaki; Kazuyuki Okuda, Kariya; 1979, pp. 3806-3808, G. M. Trees et al ‘Document recovery
Yoshihiro Kitagawa, Nagoya, all of after system failure’.
Japan Database WPI. Week 9233, Derwent Publications Ltd.,
London, GB; AN 92-270360 & EP-A-0 498 374 (Toshiba
[73] Assignee: Nippondenso Co, Ltd.. Aichi-pref., Computer Eng Corp) 3 Mar, 1993_
Japan Database WPI, Week 8703, Derwent Publications Ltd.,
London, GB; AN 87-015576 & DE-A-36 22 822 (Hitachi
[21] Appl. No.: 357,923 K.K.) 15 Jan. 1987;.
[22] Filed: Dec' 16’ 1994 Primary Examiner-Kevin J. Teska
- - - - - Assistant Examiner—Tyrone V. Walker
[30] Forelgn Apphcatlon Pnonty Data Attomey, Agent, or Firm-Cushman Darby & Cushman 1P
Dec. 17, 1993 [JP] Japan .................................. .. 5-318612 Group of Pillsbury Madison & Sun-o LLP
Mar 18, 1994 [JP] Japan .................................. .. 6-049038
6 [57] ABSTRACT
[51] Int. Cl. .................................................... .. G06F 11/16
[52] US. Cl. ................. .. 701/115; 371/671; 395/182.04; A backup RAM for Swn‘ng Pieces of diagnosis data regard
> 701/114 less of the cut-o?’ of an elecnic power is provided in a
- [58] Field of Search ........................ .. 364/431.12, 431.11, Portion of a RAM- In Cases Where thc detection of an
364/424_034, 424.035; 395/43 1, 438’ 18204; unusual Condition by a throttle sensor or a water temperature
34032516; 73/1173; 371/67_1 sensor is judged by a CPU in a current processing routine,
a ?rst checking value indicating that the backup RAM is in
[56] Referencw Cited a renewing period is stored in a checking region of the
. backup RAM, and pieces of previous diagnosis data stored
U-S- PATENT DOCUMENTS in a data access region of the backup RAM in a previous
4,271,402 6/1981 Kastura et al. .................. .. 364/431.12 Processing routine are copied to a temporal? refuge region
4,307,455 12/1981 Juhasz et al. ............ .. 364/424.04 Of the backup RAM- Thereafter, Picccs Of updated diagnosis
4,348,729 9/1982 Sasayama et al. ........... .. 364/431.12 data obtainedin the current processing routine are stored one
4,891,760 1/1990 Kashiwazaki et al. ........ .. 364/443 by one in the data access region in place of the previous
4,943,924 7/1990 Kanegae et al. ............. .. 364/431.12 diagnosis data, and a second checking value indicating that
1E1); 212??“ at al the backup RAM is in a renewal ?nishing period is stored in
5,, 276,, 619 1,1994 Ohmmiz eut a. .1 .. . . . . . . . . . . . . ._ . . . 3..6 4,431.1. 2 the checki- ng regi- on. cases where the ?rst checki- ng data
5,497,330 3/1996 Ishida . . . . . . . . . . . .. 364/431.12 1s stored 1.“ the chEckmg regm‘.‘ when. the e1.e°m° POW“ a.“
5,526,267 6/1996 Sogawa ............................ .. 364/431.12 Off 15 agaln SuPPhcd» the Prevlous ‘hagm’sls data “med 1“
the temporary refuge region are returned to the data access
FOREIGN PATENT DOCUMENTS region and are read out according to a request from a
diagnosis checker.
0025330 3/1981 European Pat. O?’. .
57-195396 12/1982 Japan .
62-142849 6/1987 Japan . 31 Claims, 27 Drawing Sheets
19
DIAGNOSIS CHECKER
$22 s21 12
1
READ ONLY
THROTTLE SENSOR » MEMORY
l5
AIR FLOW DETECTOR 7*
(15
CRANK ANGLE INP> UT/OUTPUT CENTRAL
SENSOR _’ CIRCUIT <21) 559E559“; 42a
rT7 moon
' ACCESS
WATER TEMPERATURE _, MEMORY
SENSOR H
1B mxup
FUEL INJECTION __
VALVE 24
CONTROL UNIT

US. ‘Patent Sep. 16, 1997 Sheet 2 0f 27 5,668,726
F/G. 2
24
[v
ADDRESS TS-TII 8-TH 7-TH _ O-TH
NO. BIT BIT BIT BIT
n BACKUP RAM CHECKING
VALUE (R101)
n+1 FuI (R102) NuI (R103)
n+2+0 DIAGNOSIS DATA D'O (NE) (R104)
n+2+1 DIAGNOSIS DATA D’I (GN) (R105) TEMPORARY
- > REFUGE
REGION
n+2+a DIAGNOSIS DATA D'a (:1) (R106) )
n+3+ a Fu2 (R107) Nu2 (R108)
n+4+ a Fu3 (RIOS) Nus (R110)
n+5+a+0 DIAGNOSIS DATA DD(NE) (R111)
L RéEéSS
n+5+ (1+1 DIAGNOSIS DATA D1 (GN) (R 112 ) REGION
n+5+a+a DIAGNOSIS DATA Da(a) (R113)

US. Patent Sep. 16, 1997 ’ Sheet 4 0f 27 5,668,726
FIG. 4
S301
HA SIGNAL; 0. TV ‘?
YES 5302
HA UNUSUAL CONDITION
CONTINUING COUNTER PASS
S304
IS THE
DETECTION OF UNUSUAL
CONDITION THE F I RST
TIME ‘?
RENEWAL PREPARATION PROCESSING
SUB-ROUTINE IS CALLED
1 8306
HA UNUSUAL CONDITION JUDGING FLAG )
Fu2 IS SET TO " I "
THE NUMBER N2 OF HA UNUSUAL )5
CONDITION JUDGEMENTS IS
INCREMENTED
I S308 , #3312
I DOPNE F‘ HA UNUSUAL CONDITION
1 S309 CONTINUING COUNTER IS
I D] ‘_ GN CLEARED
$310
I DEE-FA | LURE CODE a P
1 $311
RENEWAL FINISH PROCESSING j
SUB-ROUTINE IS CALLED
-L
U.S. Patent Sep. 16, 1997 Sheet 5 of 27 5,668,726
P76. 5 .
I V8401
FuI ¢— Fug
NuI *- Nuz
v {V3402
‘ , DIAGNOSIS DATA D'o +-Do
DIAGNOSIS DATA D'I <—DI
DIAGNOSIS DATA D'a <-D¢
[V3403
V
FIRST HA CHECKING DATA ' UOH' IS WRITTEN
IN CHECKING REGION RI OI
I
( END )
FIG. 6
E 0ND CHECKING DATA ' A5HI IS WRITTEN
HECKING REGION RI [II
I END )
US. Patent Sep. 16, 1997 Sheet 6 0f 27 5,668,726
FIG. 7
S501
TW SIGNALZO. IV ‘?
S502 YES
TW SIGNALé 4. 9V ‘.7
I NO
S503
TW UNUSUAL CONDITION
CONTINUING COUNTER PASS
S504
IS THE
DETECTION OF UNUSUAL
CONDITION THE FI RST
TIME ‘3
$505
RENEWAL PREPARATION PROCESSING J
SUB-ROUTINE IS CALLED
1 8506
TN UNUSUAL CONDITION JUDG I NG FLAG J
Fu3 IS SET TO " I"
THE NUMBER N3 0F TW UNUSUAL ;
CONDITION JUDGEMENTS |s
INCREMENTED
I $508 I [V3512
I D0+~NE F W UNUSUAL CONDITION
1 S509 CONTINUING COUNTER IS
I D] (_ GN CLEARED
| Da+~ FA I LURE CODE a
I ssn
RENEWAL FIN I SH PROCESSING j
SUB-ROUTINE IS CALLED

US. Patent Sep. 16, 1997 Sheet 8 of 27 5,668,726
P76". .9
IS BACKUP
RAM CHECKING VALUE SET TO
' A5H' ‘2
S602
AN OFFSET BETWEEN A RETURNING ADDRESS J
AND (n+3+ a ) -TH ADDRESS IS CALCULATED
WITH FIRST CHECKING DATA TO RETURN THE
FLAG Ful AND THE NUMBER NuI TO THE
RETURNING ADDRESS
I S603
THE FLAG FuI AND THE NUMBER NUI ARE 2’
RETURNED TO {(n+3+ a)+OFFSET} —TH ADDRESS
I , S604
DIAGNOSIS DATA D0'—D0 J
DIAGNOSIS DATA DIS-"D11
DIAGNOSIS DATA Dan-D'a
I 8605
BACKUP RAM CHECKING VALUE IS-RESET )’ I
TO ' ASH” -
L
5,668,726
US. Patent Sep. 16, 1997 Sheet 9 0f 27
FIG. 70
DOES
DIAGNOSIS CHECKER
NO
REQUEST THE OUTPUT OF
DTAGNOSIS DATA
9
S612
THE FLAGS Fug, Fu3 AND THE NUMBERS
Nuz,Nu3 ARE OUTPUT
ARE ALL
OF THE FLAGS AND THE NUMBERS
OUTPUT ‘.7
YES
S614
DIAGNOSTS DATA ARE OUTPUT