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QC/T 1089-2017

Chinese Standard: 'QC/T 1089-2017'
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BASIC DATA
Standard ID QC/T 1089-2017 (QC/T1089-2017)
Description (Translated English) (Requirements and Test Methods for Regenerative Braking System of Electric Vehicles)
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Date of Issue 2017-07-07
Date of Implementation 2018-01-01
Regulation (derived from) Ministry of Industry and Information Technology Bulletin 2017 No.32
Summary This standard specifies the scope, terminology and definitions, symbols, requirements, test methods and test results of the electric vehicle regenerative braking system test.

QC/T 1089-2017
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040
T 24
Requirements and test methods for regenerative
braking system in electric vehicles
电动汽车再生制动系统要求及试验方法
ISSUED ON: JULY 07, 2017
IMPLEMENTED ON: JANUARY 01, 2018
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 6 
4 Symbols ... 8 
5 General requirements ... 8 
6 Test methods ... 9 
Appendix A (Normative) Test methods for brake safety of regenerative braking
system in electric vehicle ... 10 
Appendix B (Normative) Test method for braking energy recovery efficiency of
regenerative braking system in electric vehicle ... 12 
Requirements and test methods for regenerative
braking system in electric vehicles
1 Scope
This standard specifies the scope, terms and definitions, symbols, requirements,
test methods, processing of test results for the test of regenerative braking
system in electric vehicles.
This standard applies to pure electric passenger vehicles which use the
rechargeable energy storage systems as power storage batteries. Pure electric
commercial vehicles may be implemented with reference to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 18386 Electric vehicles - Energy consumption and range - Test
procedures
GB/T 19596 Terminology of electric vehicles
GB 7258 Safety specifications for power-driven vehicles operating on roads
GB 21670 Technical requirements and testing methods for passenger car
braking systems
GB 18352 Limits and measurement methods for emissions of pollutants from
light-duty vehicles
3 Terms and definitions
The terms and definitions as defined in GB/T 19596 as well as the following
terms and definitions apply to this standard.
3.1
Rechargeable energy storage system (REESS)
is turned on and off (D1 - D2) to the driving range D2 when the braking energy
recovery function is turned off.
4 Symbols
The following symbols apply to this standard.
E1: Recovered braking energy (kW • h).
E2: Theoretical maximum braking energy (kW • h).
η: Braking energy recovery efficiency.
D1: The driving range of the electric vehicle when the brake energy recovery
function is turned on (km).
D2: The driving range of the electric vehicle when the brake energy recovery
function is turned off (km).
P1: Brake energy recovery range contribution rate.
I: The current as fed back from the braking energy recovery system to the
busbar of the rechargeable energy storage system (A).
U: Voltage across the rechargeable energy storage system (V).
E3: The reduction of kinetic energy during deceleration of the vehicle (kW • h).
V: Vehicle’s speed during deceleration of the vehicle (km/h).
A, B, C: Vehicle’s taxi coefficient.
m: Vehicle’s reference mass (kg).
V1, V2: The speed of the vehicle during deceleration, wherein V1 is the speed of
the previous moment and V2 is the speed of the latter moment, and V1 > V2, in
the unit of km/h.
5 General requirements
5.1 Braking performance
5.1.1 The braking performance of the vehicle shall meet the requirements as
specified in GB 21670.
5.1.2 In the case of emergency braking of vehicle, when the braking energy
recovery function is turned on and off, the braking efficiency shall not change
Appendix A
(Normative)
Test methods for brake safety of regenerative braking system in electric
vehicle
A.1 Test vehicle, site, running-in, etc. shall be in accordance with the
requirements of test method 7 of GB 21670.
A.2 Follow the requirements of clause 7 in the test method of GB 21670 to carry
out test.
A.3 Test of the stability of the braking efficiency of the rechargeable energy
storage system in vehicle under different SOC conditions.
The selected vehicles are tested in the following three states:
a) The vehicle is fully charged or the SOC is above 95%;
b) The vehicle discharges and finishes 1/3 constant speed driving range;
c) The vehicle discharges and finishes 2/3 constant speed driving range.
A.3.1 The vehicle is unloaded. The initial braking speed as specified in this test
is 80% of the maximum vehicle speed; it shall not exceed 160 km/h. During the
test, first confirm that the average temperature of the service brake on the axle
which has the highest temperature is within 65 °C ~ 100 °C. On a level road
which has good adhesion coefficient, accelerate the vehicle to the test speed
of 5 km/h or more. When the vehicle’s speed decreases to the speed as
specified in the test, apply the service brake.
A.3.2 For vehicles whose electric drive train cannot be disengaged from the
wheel, the test is carried out under the conditions of engagement of electric
drive train.
A.3.3 During the braking of the vehicle from the specified initial speed to 10
km/h, the wheel shall not be locked. Record the braking distance S1.
A.3.4 According to the test results, calculate the mean fully developed braking
deceleration (MFDD1) of vehicle.
A.3.5 Turn on the braking energy recovery function. Repeat A.3.1 ~ A.3.3.
According to the test results, calculate the MFDD under these three conditions
as well as its standard deviation S and mean value.
Appendix B
(Normative)
Test method for braking energy recovery efficiency of regenerative
braking system in electric vehicle
B.1 Test vehicles, sites, running-in requirements shall be in accordance with the
requirements as specified in GB/T 18386.
B.2 This test is divided into constant-speed test and working condition test.
Firstly, follow the requirements of B.3 to carry out the constant-speed test,
mainly to verify the turn-on/off state of the braking energy recovery system.
When the test result is confirmed to be effective, follow the requirements of B.4
to carry out the working condition test.
B.3 Constant-speed test
B.3.1 Turn on the brake energy recovery function.
B.3.2 Specify a certain vehicle speed (60 km/h ~ 80 km/h). Carry out the
constant-speed test. Record the distance D0 as covered by the test vehicle (km).
B.3.3 Turn off the brake energy recovery function.
B.3.4 Use the speed as specified in B.3.2 to carry out the constant-speed test.
Record the distance D0’ as covered by the test vehicle (km).
B.3.5 Compare D0 and D0' if (D0 - D0') / D0' ≤ 3%, continue......
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