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QC/T 1076-2017

Chinese Standard: 'QC/T 1076-2017'
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Detail Information of QC/T 1076-2017; QC/T1076-2017
Description (Translated English): (Continuously variable transmission (CVT) performance requirements and test methods)
Sector / Industry: Automobile & Vehicle Industry Standard (Recommended)
Date of Issue: 2017-04-12
Date of Implementation: 2017-10-01
Regulation (derived from): Ministry of Industry and Information Technology Bulletin 2017 No.14
Summary: This standard specifies the performance requirements and test methods for the M1 class of continuously variable transmission (CVT).

QC/T 1076-2017
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 21
Performance requirements and testing methods for
continuously variable transmission
无级变速器(CVT)性能要求及试验方法
ISSUED ON: APRIL 12, 2017
IMPLEMENTED ON: OCTOBER 1, 2017
Issued by: Ministry of Industry and Information Technology of the
People’s Republic of China.
Table of Contents
Foreword ... 7 
1 Scope ... 8 
2 Normative references ... 8 
3 Terms and definitions ... 9 
4 Testing requirements and performance requirements ... 10 
5 Testing methods ... 13 
Performance requirements and testing methods for
continuously variable transmission
1 Scope
This Standard specifies the performance requirements and testing methods
for continuously variable transmissions (CVTs) for M1 vehicles.
This Standard applies to the M1 vehicles equipped with CVTs, while N1
vehicles equipped with CVTs and M2 vehicles under 3,500kg may be
implemented in accordance with this Standard.
2 Normative references
The following documents are essential for the application of this Standard.
For dated references, only the dated editions apply to this Standard. For
undated references, the latest editions (including all amendments) apply to
this Standard.
GB 15089 Classification of power-driven vehicle and trailers
GB 18352.5-2013 Limits and measurement methods for emissions from
light-duty vehicles (CHINA 5)
GB 19233 Measurement methods of fuel consumption for light-duty
vehicles
QC/T 465 Automotive mechanical transmission terminology and definition
ECE R10 Rev. 3 Uniform provisions concerning the approval of: vehicles
with regard to electromagnetic compatibility
ISO 11451-2 Road vehicles - Vehicle test methods for electrical
disturbances from narrowband radiated electromagnetic energy - Part 2:
Off-vehicle radiation sources
ISO 11452-4 Road vehicles - Vehicle test methods for electrical
disturbances from narrowband radiated electromagnetic energy - Part 4:
Bulk current injection (BCI)
3.11 Starting device
A device that is coupled between the engine and the transmission to transfer
engine torque to the transmission, such as a torque converter, a friction clutch,
etc.
3.12 Lock up
A connection state where the speed difference between input and output of
the starting device is 0.
3.13 Optimal fuel consumption curve
A curve connecting the lowest effective fuel consumption rate under different
operating conditions of the engine.
4 Testing requirements and performance
requirements
4.1 Testing requirements
4.1.1 Testing conditions
4.1.1.1 Environment
During the test, the temperature in the test chamber shall be 288K to 308K
(15°C to 35°C), the relative humidity shall be 20% to 60%, and the altitude
shall not exceed 1,000m.
4.1.1.2 Transmission oil
The transmission oil specified by the transmission manufacturer may be used,
and the fuel quantity is allowed to be adjusted in a manner specified by the
manufacturer.
4.1.1.3 Bench test run-in
Before performing the measurement test of the actual gear ratio and gear
ratio spread, transmission torque capacity, and steady-state efficiency, the
test samples shall be run-in according to the following specifications:
a) The speed of the drive motor is set to 1,000r/min to 2,000r/min, and the
torque is set to 50% of the rated torque.
b) RUN-IN 1h in the states of the largest transmission ratio, the smallest
transmission ratio, and the middle transmission ratio, respectively.
connecting shaft of the CVT.
5.1.1.1.3 The CVT oil cooler and piping shall be the same as when the
vehicle is running normally, and the rigid pipe cannot be bent.
5.1.1.1.4 The joint shall be effectively sealed and shall not leak oil.
5.1.1.2 Run-in
The test equipment and samples shall be run-in in accordance with the
requirements of 4.1.3.
5.1.2 Test procedure
5.1.2.1 SET the drive motor to the speed control mode.
5.1.2.2 SET the load motor to the no-load state.
5.1.2.3 SET the CVT to the D-gear position.
5.1.2.4 SET the starting device to the lock-up state.
5.1.2.5 INCREASE the speed of the drive motor so that the transmission is
able to achieve the lowest oil pressure to maintain normal operation.
5.1.2.6 ADJUST the CVT controller so that the transmission reaches the oil
pressure design value at the largest transmission ratio or the smallest
transmission ratio, respectively, and operates stably.
5.1.2.7 MEASURE the drive motor speed, N1, and N2 and N3 of the load
motor at different gear ratios. The measurement time is not less than 10s, and
the sampling interval is no more than 10ms.
5.1.2.8 REPEAT steps 5.1.2.3 to 5.1.2.7 for 3 tests.
5.1.3 Treatment of test results
5.1.3.1 CALCULATE the gear ratio according to the following formula:
Where:
I - Gear ratio;
N1i - The average speed of the drive motor in the ith test;
During the test, the difference between the theoretical speed and the actual
speed of the transmission load motor shall not exceed 5%, and the input
torque at this time is the transmission torque capacity.
It shall be corrected according to the following formula:
Where:
Tc - Transmission torque capacity;
Tin - Input torque;
Tdin - Loss of torque at the input of the device.
5.3 Optimal fuel economy tracking performance of the engine
5.3.1 Test preparation
Pre-test preparation shall be carried out in accordance with the requirements
of 4.1.5.
5.3.2 Test cycle
The test cycle, as described in Annex CA of Appendix C of GB 18352.5-2013,
consists of two parts of Part 1 (urban driving) and Part 2 (suburban driving). If
the vehicle does not reach the acceleration and maximum speed values
required by the test cycle, the accelerator pedal shall be stepped through until
the required operating curve is returned. Deviation from the test cycle shall be
documented in the test report.
5.3.3 Dynamometer settings
The load and inertia of the dynamometer shall be set according to the
provisions of Appendix C of GB 18352.5-2013.
5.3.4 Test procedure
5.3.4.1 OBTAIN the engine optimal fuel consumption rate curve map.
5.3.4.2 RUN the test according to the provisions of Appendix C of GB
18352.5-2013.
5.3.4.3 MEASURE the engine speed and torque.
5.3.4.4 The data acquisition frequency is 1Hz.
Where:
L - Lock-up ratio;
tlock - Lock-up duration;
t - Total duration of the test (excluding the idle time).
5.5 Transmission efficiency
5.5.1 Test preparation
Pre-test preparation shall be carried out in accordance with the requirements
of 5.1.1.
5.5.2 Test procedure
5.5.2.1 SET the drive motor to the speed control mode.
5.5.2.2 SET the load motor to the torque control mode.
5.5.2.3 SET the CVT to the D-gear position.
5.5.2.4 SET the starting device to the lock-up state.
5.5.2.5 SET the drive motor speed to 1,000r/min.
5.5.2.6 ADJUST the CVT controller so that the transmission reaches the oil
pressure design value at the largest transmission ratio, and operates stably.
5.5.2.7 ADJUST the torque of the drive motor to 25%, 50%, and 75% of the
rated torque load, respectively, and MEASURE the torque of the load motor;
after the value is stable, the measurement time is not less than 10s.
5.5.2.8 The load motor speed is increased by an increment of 1,000r/min
(the maximum speed does not exceed the speed corresponding to the vehicle
speed of 120km/h). MAINTAIN the gear ratio and the drive motor torque
unchanged. MEASURE the speed and torque of the load motor.
5.5.2.9 INCREASE the drive motor torque as specified in Table 3, and
REPEAT the test procedure 5.5.2.8.
5.5.2.10 ADJUST the CVT controller to make the transmission reach the oil
pressure design value at the middle ratio and operate stably. REPEAT the
test procedures 5.2.2.7 to 5.2.2.9.
5.5.2.11 ADJUST the CVT controller to make the transmission reach the oil
pressure design value at the smallest transmission ratio and operate stably.
REPEAT the test procedures 5.2.2.7 to 5.2.2.9.
5.6.1.2 Speed, torque and temperature measuring devices.
5.6.1.3 Calibrator, microphone and wind ball.
5.6.1.4 Noise data acquisition and processing system.
5.6.2 Test requirements
5.6.2.1 The test shall be carried out in a semi-anechoic chamber with a
background noise of less than 25dB(A); and the difference between the final
measurement and the background noise shall not be less than 10dB(A).
5.6.2.2 The installation state of the CVT on the bench is the same as the
installation state on the complete vehicle. The shaft axis of the CVT input
shaft is not less than 400mm from the ground.
5.6.2.3 The CVT output shaft shall use the drive shaft and hub (if any) of the
original vehicle.
5.6.2.4 The cooling capacity of the oil cooling unit of the test bench is
equivalent to the original vehicle, and the CVT is guaranteed to operate
normally.
5.6.2.5 During the noise measurement process, the fan cannot be used.
The CVT lubricating oil temperature is maintained at (80±5)°C, and the
individual extreme conditions may relax the temperature limit, but shall not
exceed 100°C.
5.6.2.6 The run-in specification shall be carried out in accordance with
4.1.3.
5.6.2.7 The frequency range of noise measurement is from 200Hz to
8,000Hz.
5.6.2.8 The installation positions of the microphone are at the top, left, right
and front of the CVT center, and the distance between the microphone and
the outer envelope surface of the CVT (corresponding to the microphone
installation side) is 1m. For different layouts of CVT, when the test bench
interferes with the position of a certain measuring point, the measuring point
may be canceled, but at most one measuring point may be canceled.
5.6.3 Test procedure
5.6.3.1 TURN off all devices of the test bench, and MEASURE the
background noise of the test chamber.
5.6.3.2 MEASURE the background noise of the test bench before the
transmission under test is installed on the bench. ARRANGE the
In the case of canceling a measuring point, the above formula is changed to:
5.7 Electromagnetic compatibility
5.7.1 Narrowband electromagnetic radiation test
Narrowband electromagnetic radiation testing shall be carried out in
accordance with the provisions of Annex 8 of ECE R10 Rev. 3 Uniform
provisions concerning the approval of: vehicles with regard to
electromagnetic compatibility. The test object is a TCU of the CVT and is
tested under power-on conditions.
For testing of other electrical components in the CVT assembly, REFER to
ECE R10 Rev. 3 Uniform provisions concerning the approval of: vehicles with
regard to electromagnetic compatibil......
Related standard:   QC/T 1066-2017  QC/T 1067.1-2017
   
 
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