WLTP-09-20e_annex - Current statas
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Transcript WLTP-09-20e_annex - Current statas
WLTP-09-20e_annex
Current status on a development of a Fuel
Economy Measurement Method considering the
Effect of Air Conditioner in Japan
14 January 2015
Japan
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Background and Objective
WLTP-09-20e_annex
• Fuel economy (FE) of new vehicles has been improving
due to the fuel efficiency standard and car
manufacturer’s effort.
• However, it is well known that the gap between
official/catalogue FE and actual driving FE is still exist
due to Air Conditioner, Driving condition, Traffic
congestion, Maintenance, etc.
• In order to provide better information to car users, a
method for evaluating the A/C effect (one of the big
factors) on FE is highly required.
Japan, Ministry Land Infrastructure Transportation (MLIT),
intend to develop the method and procedure to evaluate
the FE under the A/C operation in the summer season.
2
Previous study (Test results using JC08)
WLTP-09-20e_annex
• Japan have been studying the effect of A/C use on Fuel economy in
the Japanese current test mode “JC08” driving mode.
• It was observed that the fuel economy was getting worse according to
increase of the specific enthalpy in the test cell.
• A good repeatability was obtained even if the dynamic driving mode
“JC08” was used.
• Questionnaire was done in order to investigate the actual A/C use in
Japan. (6,000 samples, Internet-based questionnaire)
Repeatability
MACTP-02-02e
MACTP-04-02e
Questionnaire
MACTP-04-02e
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WLTP-09-20e_annex
Test Program in FY2013
A/C tests were conducted in various conditions (ambient temperature
and humidity) using 2 vehicles in order to confirm whether the same
characteristics and good repeatability can be obtain or not, if WLTC
was applied instead of JC08.
• Vehicle A: 1.3L Petrol, CVT, Manual A/C, Idling stop system
• Vehicle B: 2.0L Petrol, CVT, Auto A/C, Idling stop system
• Test cycle: WLTC CL3-2 Phase1~3 (Low + Medium + High)
• Pre. conditioning: 60 km/h×30 min. with A/C operating
A/C setting / Vehicle condition
Vehicle ID
A/C type
A/C
Temp.
operation setting
A/C OFF
Veh.A
Manual A/C
A/C ON
Idle
23℃25℃28℃35℃stop(IS)
40%50%55%40%operation 40 kJ/kg 50 kJ/kg 61 kJ/kg 71 kJ/kg
Remark
(Test ID*)
Inlet
mode
Blower
level
Outlet
mode
(FRESH)
-
(FACE)
ON
-
●
-
-
Standard
LO (1/4)
FACE
ON
○
●
○
●
LFL - IS ON
MID (2/4)
FACE
ON
○
●
○
●
LFM - IS ON
LOWES
FRESH
T
A/C ON
LOWES
FRESH
T
A/C OFF
Veh.B
Auto A/C
-
Start
Environmental condition
Change A/C setting
-
(FRESH)
-
(FACE)
ON
-
●
-
-
Standard
22℃
AUTO
AUTO
AUTO
ON
○
●
○
●
22AA - IS ON
22℃
FRESH
MID (4/7)
FACE
ON
○
●
○
●
22FM - IS ON
25℃
AUTO
AUTO
AUTO
ON
○
●
○
●
25AA - IS ON
●:Number of test = 2, ○:Number of test = 1
*) Test ID: Temp. setting - Inlet mode - Blower level - IS Operation
Precon. 60km/h×30min
WLTC - LMH
Analyze
End
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WLTP-09-20e_annex
Test results using WLTC
2.0
y = 0.024x - 0.3395
7.18
2.5
6.68
2.0
2
R = 0.9637
1.5
6.18
1.0
5.68
y = 0.0201x - 0.3137
R2 = 0.915
0.5
5.18
A/C OFF - IS ON
0.0
4.68
LFL - IS ON
Additional fuel consumption
(L/100km)
LFL: Lowest - FRESH - LO (1/4)
LFM: Lowest - FRESH - MID (2/4)
IS: Idling stop
Fuel consumption (L/100km)
Additional fuel consumption
(L/100km)
2.5
[ Auto A/C system ]
1.5
4.18
30
40
50
60
70
Specific enthalpy in the test cell (kJ/kg(DA))
80
10.0
9.5
y = 0.0176x - 0.2439
R2 = 0.7936
1.0
9.0
0.5
8.5
y = 0.0106x + 0.1452
2
R = 0.6844
0.0
LFM - IS ON
-0.5
10.5
22FM: 22℃ - FRESH - MID(4/7) y = 0.0339x - 0.2939
R2 = 0.9219
22AA: 22℃ - AUTO – AUTO
25AA: 25℃ - AUTO - AUTO
IS: Idling stop
A/C OFF - IS ON
22FM - IS ON
22AA - IS ON
25AA - IS ON
8.0
-0.5
Fuel consumption (L/100km)
[ Manual A/C system ]
7.5
30
40
50
60
70
Specific enthalpy in the test cell (kJ/kg(DA))
80
The good repeatability on fuel consumption (less than 3%)
was also obtained when the WLTC was used.
It was observed that the additional fuel consumption was
increased according to increase of specific enthalpy in the
test cell same as in JC08 driving mode.
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Summary and Future plans
WLTP-09-20e_annex
This method might be applicable to evaluate the
effect of air conditioner on fuel consumption.
Japan plans to conduct further study in FY2014
Parameters
• Environmental condition
• A/C type (Manual/Auto)
• A/C setting (Blower level, Temp.
setting, inlet mode)
• Volume in a vehicle cabin
• etc
Actual data in use
• Representative environmental
condition by statistics
JPN Aug.: 30 degC, 60%RH, 71 kJ/kg
• Actual A/C use from questionnaire
• etc
Develop the test procedure with the WLTC
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