GB T 43404-2023 English Version Foreign Language Version Translated Version Light Vehicle Road Load Chassis Dynamometer Reproduction.
GBT 43404-2023 English Foreign Language Translated GB 43404-2023 English Foreign Language Translated Version.
1 range. This document specifies the method for carrying out road load reproduction on a chassis dynamometer for automobiles. This document applies to cars with a maximum design total mass of up to 3 500 kg and for class M with a maximum design total mass of more than 3 500 kg but not more than 4 500 kg. Class and N class cars are performed with reference.
The provisions for setting the load of the chassis dynamometer described in this document by the coasting method are applicable to the setting of the road load of the test vehicle measured by the coasting method or the wind tunnel method.
The torque meter method described in this document sets the load clause of the chassis dynamometer, which is applicable to the setting of the driving resistance of the test vehicle measured by the torque meter method.
2. Normative references.
The content of the following documents constitutes an essential provision of this document by means of normative references in the text. Among them, the reference document with the date is noted, and only the version corresponding to that date applies to this document;For undated references, the most recent version of the document (including all change orders) applies.
this document. gb/t 3730.1Terms and definitions for automobiles, trailers and car trains Part 1: Types.
GB T15089 Classification of motor vehicles and trailers.
gb18352.6. Pollutant emission limits and measurement methods for light vehicles (China Phase VI).
IS0 10521-1 Road Vehicles Road Load Part 1: Determination under reference atmospheric conditions
3Terms and Definitions.
gb/t 3730.1,gb/t 15089,gb 18352.6 and S1521-1 and the following terms and definitions apply to this document.
Road load
The resistance that impedes the movement of a vehicle, including the frictional resistance of the drivetrain, measured by the coasting method or equivalent.
Running resistance
The drag moment in the opposite direction of the vehicle, measured by a torsion gauge mounted on the vehicle's driving wheels.
Target road load
The road load to be reproduced on the chassis dynamometer.
target running resistance
The driving resistance to be reproduced on the chassis dynamometer.
Speed range
Start at 20 km h and increase to the maximum base speed in 10 km h steps.
Chassis dynamometer of coefficient control chassis dynamometer of coefficient control chassis dynamometer determines absorption characteristics from the approximate polynomial coefficients of a given road load.
Chassis dynamometer of polygonal control A chassis dynamometer of polygonal control that determines the absorption characteristics by giving load values at several speed points.
Rotation mass
When the vehicle is driving in neutral gear on the road, the equivalent effective mass of all rotating parts and wheels on the vehicle Note 1: The rotating mass can be determined by test or calculation method.
Note 2: Rotational mass estimation can be made based on the curb weight of the vehicle plus 3% of 100 g.
4. Instrument and equipment requirements.
The instrument and equipment should meet the requirements given in Table 1.
5. Test preparation.
5.1. Parameter setting.
5.1.1. Before the test, the following parameters should be determined according to the purpose of the follow-up test (the following parameters should be consistent with the follow-up test items): target road load or target driving resistance;a)
b) speed range;
c) Base speed.
5.1.2 The maximum base speed is determined according to the following provisions.
The maximum base speed should be 130 kmh, which can be adjusted to 120 kmh for pure electric vehicles. The determination of the road load and the setting of the chassis dynamometer a] should be carried out at the same reference speed point.
If the maximum base speed plus 14 km h is greater than or equal to the maximum speed of the test vehicle, this speed should be excluded when the road load is measured6 or when the resistance is set on the chassis dynamometer. This time the highest base speed becomes the maximum base speed of the vehicle.
5.2. Laboratory conditions.
5.2,1 roller.
5.2.1.1. The chassis dynamometer drum should be a clean, dry, rough surface without foreign matter, and the counterweight can be placed on or in the car to prevent the wheels from slipping, and the counterweight should be recorded.
5.2.1.2. For multi-rolling chassis dynamometer, rolling should be carried out in the same coupled or uncoupled state as in the subsequent test. The rotational speed of the chassis dynamometer should be measured on a rolling tape coupled to the power absorption unit.
5.2.2 Room temperature.
The laboratory temperature should be set to 23C ±5C or according to the special needs of the test.
5.3. Chassis dynamometer preparation.
5.3.1 Inertia setting.
5.3.1.1 shall be in accordance with 53.1,2 and 53,1.3. Set the equivalent quantity, if it is not possible, it should be set by the adjacent larger equivalent inertia, but not more than 10 kg.
5.3.1.2. The vehicle is tested on a four-wheel drive chassis dynamometer, and if the front and rear axles rotate at the same time, the equivalent inertia of the chassis dynamometer should be set to the corresponding vehicle test mass.
5.3.1.3 The vehicle is tested on a two-wheel drive chassis dynamometer The equivalent inertia of the chassis dynamometer shall be set as the vehicle test mass plus the effective inertia of the wheels that does not affect the measurement results, or 50% of the rotating mass.
5.3.2. Preheating of the chassis dynamometer.
The chassis dynamometer should be preheated according to the chassis dynamometer manufacturer's instructions, or other suitable methods, until the internal friction loss can be stabilized.
5.4.2 Vehicle Settings.
5.4.2.1 The vehicle to be tested should be installed in the middle position of the chassis dynamometer drum and fixed in a safe manner. For a single roller, the horizontal distance between the tire contact point and the top of the roller should be within 25 mm or 2% of the diameter of the roller, whichever is smaller. 5.4.2.2 Using the torque meter method for measurement, the tire pressure should be adjusted to the tire dynamic radius of the taxi 0Within 5%. If the adjustment causes the tire pressure to exceed 54.1 If the specified range is specified, the torque meter method should not be used. 5.4.2.3 Tire dynamic radius by a2.1Calculated average of the tire dynamic radius at or at each base speed at 0 km h.
5.4.3. Vehicle preheating.
5.4.3.1 The load can be set according to the chassis dynamometer of similar models, or selected according to the different measurement methods 61.1.1 or 62.1.1. The power absorption unit of the chassis dynamometer when the specified initial load setting is warmed up. 5.4.3.2. The vehicle should be fully warmed up on the chassis dynamometer to make it reach a stable state. It is advisable to drive at a constant speed of not less than 80 km h for at least 20 min, or for 1 2 full CLTC cycles (for vehicles with a maximum design total mass greater than 3 00 kg, it is advisable to drive the CHTC cycle).
Note 1: CLTC (China Light-duty Vehicle Test Cyele), China Light Vehicle Test Conditions Note 2: CHTC (China He**y-Duty Vehicle Test Cycle), China Heavy Vehicle Test Conditions.
Set chassis dynamometer load 6
6.1. Slide method to set the chassis dynamometer.
6.11. Chassis dynamometer load setting.
6.1.1.1 Initial load setting.
For the coefficient control chassis dynamometer, the initial coefficient aa, b given in equation (1) should be followed. and c. Adjust the power absorption unit of the chassis dynamometer.
6.2. The torque meter method sets the chassis dynamometer.
6.2.1. The torque meter method sets the chassis dynamometer.
6.2.1.1 Initial load setting.
For the coefficient control chassis dynamometer, the initial coefficient a b given in equation (7) should be followed. and c. Adjust the power absorption unit of the chassis dynamometer.