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GB/T 43404-2023 English PDF (GBT43404-2023)
GB/T 43404-2023 English PDF (GBT43404-2023)
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GB/T 43404-2023: Road load for light-duty vehicles -- Reproduction on chassis dynamometer
GB/T 43404-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
CCS T 04
Road Load for Light-duty Vehicles - Reproduction on
Chassis Dynamometer
(ISO 10521-2:2006, Road Vehicles - Road Load - Part 2: Reproduction on Chassis
Dynamometer, MOD)
ISSUED ON: NOVEMBER 27, 2023
IMPLEMENTED ON: JUNE 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Requirements for Instruments and Equipment ... 8
5 Test Preparation ... 8
6 Load Setting of Chassis Dynamometer ... 10
Appendix A (normative) Calculation of Simulated Road Load on Chassis Dynamometer
... 16
Appendix B (normative) Adjustment of Chassis Dynamometer Setting Load ... 19
Road Load for Light-duty Vehicles - Reproduction on
Chassis Dynamometer
1 Scope
This document specifies the method for carrying out road load reproduction of vehicles on
chassis dynamometer.
This document is applicable to vehicles with a maximum design total mass not exceeding 3,500
kg. Category M1, M2 and N2 vehicles with a maximum design total mass exceeding 3,500 kg,
but not exceeding 4,500 kg, may take this as a reference.
The provisions for setting the chassis dynamometer load by the taxiing method described in
this document are applicable to the setting of the test vehicle road load determined by the taxing
method or the wind tunnel method.
The provisions for setting the chassis dynamometer load by the torque meter method described
in this document are applicable to the setting of the test vehicle running resistance determined
by the torque meter method.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 3730.1 Terms and Definitions of Motor Vehicles, Trailers and Combination Vehicle - Part
1: Types
GB/T 15089 Classification of Power-driven Vehicles and Trailers
GB 18352.6 Limits and Measurement Methods for Emissions from Light-duty Vehicles (China
6)
ISO 10521-1 Road Vehicles - Road Load - Part 1: Determination under Reference Atmospheric
Conditions
3 Terms and Definitions
What is defined in GB/T 3730.1, GB/T 15089. GB 18352.6 and ISO 10521-1, and the following
terms and definitions are applicable to this document.
3.1 road load
The resistance that hinders the running of the vehicle when measured by the taxiing method or
equivalent method, including the frictional resistance of the transmission system.
3.2 running resistance
The resistance torque opposite to the direction of the running of the vehicle measured by a
torque meter installed on the drive wheels of the vehicle.
3.3 target road load
The road load to be reproduced on a chassis dynamometer.
3.4 target running resistance
The running resistance to be reproduced on a chassis dynamometer.
3.5 chassis-dynamometer setting load
The load set on the power absorption unit of a chassis dynamometer.
3.6 simulated road load
By loading on a chassis dynamometer, the actual measured road load on the road is reproduced
in the form of force.
3.7 simulated running resistance
By loading on a chassis dynamometer, the actual measured running resistance on the road is
reproduced in the form of force.
3.8 reference speed
The vehicle running speed used to determine road load or chassis dynamometer load.
3.9 speed range
Starting from 20 km/h, in steps of 10 km/h, increase to the maximum reference speed.
3.10 chassis dynamometer of coefficient control
A chassis dynamometer that determines the absorption characteristics using approximate
polynomial coefficients for given road loads.
3.11 chassis dynamometer of polygonal control
A chassis dynamometer that determines the absorption characteristics using given load values
at several speed points.
b) If the maximum reference speed plus 14 km/h is greater than or equal to the maximum
speed of the test vehicle, when determining the road load, or setting the resistance on
the chassis dynamometer, this speed shall be eliminated. At this moment, the second
highest reference speed becomes the maximum reference speed of the vehicle.
5.2 Laboratory Conditions
5.2.1 Roller
5.2.1.1 The roller of the chassis dynamometer shall have a clean, dry and rough surface without
foreign matters. Counterweights can be placed on or in the vehicle to prevent wheel slipping.
The counterweight conditions shall be recorded.
5.2.1.2 For multi-roller chassis dynamometer, the roller shall be operated in the same coupled
or uncoupled state as in subsequent tests. The rotational speed of the chassis dynamometer shall
be measured on a roller coupled to a power absorption unit.
5.2.2 Indoor temperature
The laboratory temperature shall be set to 23 C 5 C, or in accordance with special test
demands.
5.3 Preparation of Chassis Dynamometer
5.3.1 Inertia setting
5.3.1.1 The equivalent inertia shall be set in accordance with 5.3.1.2 and 5.3.1.3. If it cannot be
set, the adjacent larger equivalent inertia shall be used for setting, but the maximum shall not
exceed 10 kg.
5.3.1.2 When the vehicle is tested on a four-wheel drive chassis dynamometer, if the front and
rear axles simultaneously rotate, the equivalent inertia of the chassis dynamometer shall be set
to the corresponding vehicle test mass.
5.3.1.3 When the vehicle is tested on a two-wheel drive chassis dynamometer, the equivalent
inertia of the chassis dynamometer shall be set to the vehicle test mass plus the effective inertia
of the wheels that does not affect the measurement results, or 50% of the rotation mass.
5.3.2 Pre-heating of chassis dynamometer
The chassis dynamometer shall be pre-heated in accordance with the chassis dynamometer
manufacturer’s instructions, or other suitable methods, until the internal frictional losses can be
stabilized.
5.4 Vehicle Preparation
5.4.1 Adjustment of tyre pressure
Before the test, the tyre pressure shall be adjusted to the recommended value, which shall be
the same as in subsequent tests. If a small diameter roller is used, the tyre pressure can be
increased to ensure test safety, usually by 50%.
5.4.2 Vehicle setting
5.4.2.1 The vehicle under test shall be installed in the center of the chassis dynamometer roller
and fixed in a safe mode. For a single roller, the horizontal distance between the tyre contact
point and the top of the roller shall be within 25 mm or 2% of the roller diameter, whichever
is smaller.
5.4.2.2 When using the torque meter method for measurement, the tyre pressure shall be
adjusted to within 0.5% of the tyre dynamic radius. If the adjustment causes the tyre pressure
to exceed the range specified in 5.4.1, then, the torque meter method shall not be used for
measurement.
5.4.2.3 The tyre dynamic radius is the average value of tyre dynamic radius calculated at the
reference speed of 80 km/h or at each reference speed in accordance with A.2.1.
5.4.3 Pre-heating of vehicle
5.4.3.1 The load can be set in accordance with the chassis dynamometer of similar vehicle
mode...
Get QUOTATION in 1-minute: Click GB/T 43404-2023
Historical versions: GB/T 43404-2023
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GB/T 43404-2023: Road load for light-duty vehicles -- Reproduction on chassis dynamometer
GB/T 43404-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
CCS T 04
Road Load for Light-duty Vehicles - Reproduction on
Chassis Dynamometer
(ISO 10521-2:2006, Road Vehicles - Road Load - Part 2: Reproduction on Chassis
Dynamometer, MOD)
ISSUED ON: NOVEMBER 27, 2023
IMPLEMENTED ON: JUNE 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Requirements for Instruments and Equipment ... 8
5 Test Preparation ... 8
6 Load Setting of Chassis Dynamometer ... 10
Appendix A (normative) Calculation of Simulated Road Load on Chassis Dynamometer
... 16
Appendix B (normative) Adjustment of Chassis Dynamometer Setting Load ... 19
Road Load for Light-duty Vehicles - Reproduction on
Chassis Dynamometer
1 Scope
This document specifies the method for carrying out road load reproduction of vehicles on
chassis dynamometer.
This document is applicable to vehicles with a maximum design total mass not exceeding 3,500
kg. Category M1, M2 and N2 vehicles with a maximum design total mass exceeding 3,500 kg,
but not exceeding 4,500 kg, may take this as a reference.
The provisions for setting the chassis dynamometer load by the taxiing method described in
this document are applicable to the setting of the test vehicle road load determined by the taxing
method or the wind tunnel method.
The provisions for setting the chassis dynamometer load by the torque meter method described
in this document are applicable to the setting of the test vehicle running resistance determined
by the torque meter method.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 3730.1 Terms and Definitions of Motor Vehicles, Trailers and Combination Vehicle - Part
1: Types
GB/T 15089 Classification of Power-driven Vehicles and Trailers
GB 18352.6 Limits and Measurement Methods for Emissions from Light-duty Vehicles (China
6)
ISO 10521-1 Road Vehicles - Road Load - Part 1: Determination under Reference Atmospheric
Conditions
3 Terms and Definitions
What is defined in GB/T 3730.1, GB/T 15089. GB 18352.6 and ISO 10521-1, and the following
terms and definitions are applicable to this document.
3.1 road load
The resistance that hinders the running of the vehicle when measured by the taxiing method or
equivalent method, including the frictional resistance of the transmission system.
3.2 running resistance
The resistance torque opposite to the direction of the running of the vehicle measured by a
torque meter installed on the drive wheels of the vehicle.
3.3 target road load
The road load to be reproduced on a chassis dynamometer.
3.4 target running resistance
The running resistance to be reproduced on a chassis dynamometer.
3.5 chassis-dynamometer setting load
The load set on the power absorption unit of a chassis dynamometer.
3.6 simulated road load
By loading on a chassis dynamometer, the actual measured road load on the road is reproduced
in the form of force.
3.7 simulated running resistance
By loading on a chassis dynamometer, the actual measured running resistance on the road is
reproduced in the form of force.
3.8 reference speed
The vehicle running speed used to determine road load or chassis dynamometer load.
3.9 speed range
Starting from 20 km/h, in steps of 10 km/h, increase to the maximum reference speed.
3.10 chassis dynamometer of coefficient control
A chassis dynamometer that determines the absorption characteristics using approximate
polynomial coefficients for given road loads.
3.11 chassis dynamometer of polygonal control
A chassis dynamometer that determines the absorption characteristics using given load values
at several speed points.
b) If the maximum reference speed plus 14 km/h is greater than or equal to the maximum
speed of the test vehicle, when determining the road load, or setting the resistance on
the chassis dynamometer, this speed shall be eliminated. At this moment, the second
highest reference speed becomes the maximum reference speed of the vehicle.
5.2 Laboratory Conditions
5.2.1 Roller
5.2.1.1 The roller of the chassis dynamometer shall have a clean, dry and rough surface without
foreign matters. Counterweights can be placed on or in the vehicle to prevent wheel slipping.
The counterweight conditions shall be recorded.
5.2.1.2 For multi-roller chassis dynamometer, the roller shall be operated in the same coupled
or uncoupled state as in subsequent tests. The rotational speed of the chassis dynamometer shall
be measured on a roller coupled to a power absorption unit.
5.2.2 Indoor temperature
The laboratory temperature shall be set to 23 C 5 C, or in accordance with special test
demands.
5.3 Preparation of Chassis Dynamometer
5.3.1 Inertia setting
5.3.1.1 The equivalent inertia shall be set in accordance with 5.3.1.2 and 5.3.1.3. If it cannot be
set, the adjacent larger equivalent inertia shall be used for setting, but the maximum shall not
exceed 10 kg.
5.3.1.2 When the vehicle is tested on a four-wheel drive chassis dynamometer, if the front and
rear axles simultaneously rotate, the equivalent inertia of the chassis dynamometer shall be set
to the corresponding vehicle test mass.
5.3.1.3 When the vehicle is tested on a two-wheel drive chassis dynamometer, the equivalent
inertia of the chassis dynamometer shall be set to the vehicle test mass plus the effective inertia
of the wheels that does not affect the measurement results, or 50% of the rotation mass.
5.3.2 Pre-heating of chassis dynamometer
The chassis dynamometer shall be pre-heated in accordance with the chassis dynamometer
manufacturer’s instructions, or other suitable methods, until the internal frictional losses can be
stabilized.
5.4 Vehicle Preparation
5.4.1 Adjustment of tyre pressure
Before the test, the tyre pressure shall be adjusted to the recommended value, which shall be
the same as in subsequent tests. If a small diameter roller is used, the tyre pressure can be
increased to ensure test safety, usually by 50%.
5.4.2 Vehicle setting
5.4.2.1 The vehicle under test shall be installed in the center of the chassis dynamometer roller
and fixed in a safe mode. For a single roller, the horizontal distance between the tyre contact
point and the top of the roller shall be within 25 mm or 2% of the roller diameter, whichever
is smaller.
5.4.2.2 When using the torque meter method for measurement, the tyre pressure shall be
adjusted to within 0.5% of the tyre dynamic radius. If the adjustment causes the tyre pressure
to exceed the range specified in 5.4.1, then, the torque meter method shall not be used for
measurement.
5.4.2.3 The tyre dynamic radius is the average value of tyre dynamic radius calculated at the
reference speed of 80 km/h or at each reference speed in accordance with A.2.1.
5.4.3 Pre-heating of vehicle
5.4.3.1 The load can be set in accordance with the chassis dynamometer of similar vehicle
mode...
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