pe09-024 honda 7/24/2009 attachment q8 qis doc 1 …pe09-024 honda 7/24/2009 attachment q8 qis doc 1...
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PE09-024 HONDA 7/24/2009
ATTACHMENT Q8 QIS
DOC 1 PAGE 2, DOC 2 PG 4, DOC 3 PG 7, DOC 4 PG 10 AND Q8 DOC 5 PG 21
PE09-024 HONDA 7/24/2009
ATTACHMENT Q8 DOC 1 ODYSSEY
QIS
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PE09-024 HONDA 7/24/2009
ATTACHMENT Q8 DOC 2 ACCORD
QIS
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PE09-024 HONDA 7/24/2009
ATTACHMENT Q8 DOC 3 ELEMENT
QIS
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PE09-024 HONDA 7/24/2009
ATTACHMENT Q8 DOC 4 ACCORD
QIS
PAGE CONTAINS CONFIDENTIAL INFORMATION 1
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PAGE CONTAINS CONFIDENTIAL INFORMATION 1
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PE09-024 HONDA 7/24/2009
ATTACHMENT Q8 DOC 5 ACCORD
QIS
PAGE CONTAINS CONFIDENTIAL INFORMATION 1
PAGE CONTAINS CONFIDENTIAL INFORMATION 2
PAGE CONTAINS CONFIDENTIAL INFORMATION 3
PAGE CONTAINS CONFIDENTIAL INFORMATION 4
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PAGE CONTAINS CONFIDENTIAL INFORMATION 11
QIS No.:
Quality Engineering Report2006/2007YM ACCORD IMA
VSA failure DTC121-21
[Members]
Prepared on: 25th May, 2007
PAGE CONTAINS CONFIDENTIAL INFORMATION 1
Occurrence Situation and Proposal 2/10-Contention, symptom: VSA warning lamp comes ON (*121-21: Regulator valve diagnosis)
“VSA, ABS, brake, ACT” comes ON-Particularities
-A lot of recurrences: 5 cases (Recurrence accounts for approx. 10%.) *It occurred four times resulting in buy-back.
-From HDS data vehicle info, warning light comes on when vehicle is at a stop.
PAGE CONTAINS CONFIDENTIAL INFORMATION 2
Result of Recreation 3/10
■Result of recreation on market return failed carAlthough warning lamp coming ON was not recreated, we confirmed abnormal counting of failures in conjunction with CAS control ON/OFF at the time of brake release. ■Test date: 10th May, 2007, ■Test location: HRA-LA
■Test car: JHMCN36466C002514 (failed car)
Detected mismatch with L/R regulator monitor signal OFF right after regulator valve shifting to OFF at CAS control completion.
PAGE CONTAINS CONFIDENTIAL INFORMATION 3
Estimating Factors 4/10
■FT analysis DTC121-21 detection
Monitor signal OFF is detected when REG valve is ON.
Software factor
Valve output is falsely
recognized as ON
Valve monitor is falsely
recognized as OFF
Abnormality in detection circuit
GND electric potential increase
solenoid electric
potential rise 5V Power
source drop
Abnormality of microcomputer
port
Abnormal resistance in partial pressure
circuit
Abnormality of detection circuit gate
Unexpected noise
No notable noise from on-car measurement results
Excluded because it recurs even though modulator is replaced.
Defect is found from software review and HILS check result.
PAGE CONTAINS CONFIDENTIAL INFORMATION 4
Occurrence Mechanism 5/10
■Noncontrolled normal diagnosis operation Request for diagnosis valve
output?No
Yes All valves are OFF
All valves are OFF
Valve output buffer (previous value)
Valve output <- Diagnosis signal
Valve output buffer <- Diagnosis signal
Obtain valve monitor
Valve output <- Diagnosis signal
Request for diagnosis valve output?
No
YesValve output buffer = valve monitor
Valve output buffer <- Valve output of this time
Clear request for valve output for diagnosis
Logic mismatch does not occur because it obtains monitor signal which is synchronized with output valve signal.
1ms processing
Goes through a path that outputs a test signal for diagnosis once per 20ms by a request from 20ms processing.
What’s obtained here is the valve condition which is outputting until just before.
Output processing of test signal for diagnosis
Output processing of signal for control
Comparison processing between test output and monitor signal
PAGE CONTAINS CONFIDENTIAL INFORMATION 5
■Diagnosis operation at the time of control completion
Occurrence Mechanism 6/10
Request for diagnosis valve output?
No
YesAll valves are OFF
All valves are OFF
Valve output buffer(previous value)
Valve output <- Diagnosis signal
Valve output buffer <- Diagnosis signal
Obtain valve monitor
Valve output <- Diagnosis signal
Request for diagnosis valve output?
No
YesValve output buffer = valve monitor
Valve signal mismatch flag set
Valve output buffer<- Valve output of this time
Clear request for valve output for diagnosis
1ms processing
Regulator valve monitor circuit
microcom
puter
Custom
IC
REG valve output REG valve
Monitor signal
REG valve output
Valve buffer logic
comparison
Valve monitor signal
Valve output for control that was held at the end of the last 1ms processing,
is referred to here.
PWM carrier cycle (1ms)
Mismatch here.
At the end of control, all valves have been confirmed to be OFF from last
output so that valve output for control and diagnosis will not continue.
Output processing of test signal for diagnosis
Output processing of signal for control
Comparison processing between test output and monitor signal
Updates latest valve monitor value
No output in the control completed loop, and valve output buffer remains at the previous value.
Compare the previous control signal and valve monitor signal right before completion of control.
At the end of PWM control, valve output is ON and valve monitor is OFF; logic mismatch
PAGE CONTAINS CONFIDENTIAL INFORMATION 6
Occurrence Prediction 7/10
■Number of occurrence prediction
From current warranty occurrences (13 cases), number of occurrences were predicted using Weibull analysis.
284 units in 10 years (remaining 271 units)
Days # of defectsYear
PAGE CONTAINS CONFIDENTIAL INFORMATION 7
Summary of Countermeasure 8/10
Comparison is carried out only at diagnosis valve output, so logic agrees without fail.
■Countermeasure spec■Countermeasure effect confirmation
Request for diagnosis valve output?
No
Yes All valves are OFF
All valves are OFF
Valve output buffer (Last value)
Valve output <- Diagnosis signal
Valve output buffer <- Diagnosis signal
Obtain valve monitor
Valve output <- Diagnosis signal
Output notice flag?
Valve output buffer = valve monitor
Valve signal mismatch flag set
Valve output buffer <- Valve output of this time
Clear request for valve output for diagnosis
1ms processing
Clear output notification flag
Set output notification flag
Run comparison processing based on output notification flag of the test signal.
Effect confirmation # of logic mismatches Max. fail count
135 CAS before countermeasure
135 CAS after countermeasure
Recreated repeated CAS operations in HILS.No mismatch between valve output and valve monitor.
PAGE CONTAINS CONFIDENTIAL INFORMATION 8
Summary of Countermeasure 9/10
■Countermeasure content VSA software change
■Affected range 2006 / 2007YM ACCORD IMA
■Market action
■Countermeasure schedule
PAGE CONTAINS CONFIDENTIAL INFORMATION 9
Recurrence Prevention 10/10
■Why-why analysis
■Recurrence preventive measures
PAGE CONTAINS CONFIDENTIAL INFORMATION 10
11/10
END
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