Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 12678-1990 Reliability running test method for motor vehicles. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 12678-1990:
a) The scope of the standard has been modified (see Clause 1; Clause 1 of Edition 1990);
b) The normative references have been modified (see Clause 2; Clause 2 of Edition 1990);
c) The terms and definitions of vehicle reliability, customer usage correlation, general reliability running test, accelerated reliability running test, vehicle failure, vehicle maintenance and repair, vehicle maintenance, and vehicle repair have been added (see 3.1~3.8);
d) The term and definition of equivalent number of failures have been modified (see 3.9; 3.6 in Edition 1990);
e) The terms and definitions of general reliability test, rapid reliability test, maintenance and repair after vehicle failure, preventive maintenance and repair, and potential vehicle failure have been deleted (see 3.1~3.5 of Edition 1990);
f) The requirements for the test vehicle have been added (see 4.2);
g) The requirements for parameter measurement and adjustment of test vehicle have been added (see 5.1);
h) The requirements for performance test for test vehicle have been modified (see 5.2; 6.4 of Edition 1990);
i) The requirements for mileage distribution in reliability test have been added (see 5.3.1.1, 5.3.2.1 and Annex A);
j) The requirements for driving operation during the test have been modified (see 5.3.1.2 and 5.3.2.2; 6.3.2.2 of Edition 1990);
k) The requirements for failure discovery, determination and process have been modified (see 5.4; 6.3.3 of Edition 1990);
l) The requirements for failure discovery during disassembly for inspection have been modified (see 5.6.7; 6.5.4 of Edition 1990);
m) The validity of reliability evaluation indicator and its calculation method have been deleted (see 7.4.6 of Edition 1990);
n) The specification design of accelerated reliability running test of customer usage correlation has been added (see Annex B);
o) Daily operation inspection items of vehicles have been added (see Annex C);
p) The records and statistics of vehicle reliability running test have been modified (see Annex D; Annex A of Edition 1990);
q) The failure statistics and reliability statistics have been modified (see Annex E; Annex A of Edition 1990);
r) The coefficient K to be multiplied when the confidence lower limit is calculated with fixed time censoring has been modified (see Annex F; Annex B of Edition 1990).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous editions of this document and documents replaced by this document are as follows:
——In 1977, it was first published as GB 1334-1977 Road test methods for trucks and off-road vehicles;
——The first revision was made in 1990 with the standard number changed to GB/T 12678, and the standard name changed to Reliability running test method for motor vehicles;
——This is the second revision.
Reliability running test method for motor vehicles
1 Scope
This standard specifies the test conditions, test procedure, test data processing and test reports for the reliability running test of motor vehicles.
This standard is applicable to all kinds of vehicles on the road, and to other types of vehicles by reference.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 12534 Motor vehicles — General rules of road test method
GB/T 12548 Motor vehicles speedometer and odometer calibration method
GB/T 12673 Motor vehicle main dimensions measurement method
GB/T 12674 Motor vehicles — Weight parameter — Measuring method
QC/T 900 Quality inspection and assessment method for products for complete motor vehicles
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
vehicle reliability
ability of a vehicle to perform the specified functions under specified conditions and within the specified time
3.2
customer usage correlation
reproduction of service load for the target customer in the testing ground or test stand
3.3
general reliability running test
reliability test carried out on the road of the non-testing ground according to certain specifications
3.4
accelerated reliability running test
reliability test with a certain acceleration coefficient and that is carried out on the road of the testing ground
Note: The acceleration coefficient refers to the ratio of the actual road mileage of customers to the test mileage of the testing ground under the condition of consistent accumulated damage.
3.5
vehicle failure
partial or complete incapacity of a vehicle
Note: Refer to GB/T 5624-2019, 5.1 for definition.
3.6
vehicle maintenance and repair
maintenance and repair for a vehicle
Note: Refer to GB/T 5624-2019, 2.4 for definition.
3.7
vehicle maintenance
operations to maintain a vehicle in good technical condition or working ability
Note: Refer to GB/T 5624-2019, 6.1 for definition.
3.8
vehicle repair
operations to restore the intact technical condition (or working ability) of a vehicle
Note: Refer to GB/T 5624-2019, 6.2 for definition.
3.9
equivalent number of failures
the number of general failures converted by a certain coefficient according to the failure category
4 Test conditions
4.1 Test environment
The general reliability running test and accelerated reliability running test shall be carried out under a variety of weather conditions, and vehicles used in special areas or for special purposes shall be tested under corresponding conditions (e.g. alpine areas, plateau areas, high-temperature dry-hot areas and high-temperature humid areas).
4.2 Test vehicle
4.2.1 The vehicle shall meet the technical requirements specified by the manufacturer.
4.2.2 The speedometer and odometer installed on the vehicle shall be inspected and corrected according to the method specified in GB/T 12548.
4.2.3 The number of vehicles: passenger vehicles shall not be less than 3, and the number of commercial vehicles and electric vehicles shall be determined by the manufacturers themselves.
4.2.4 Model configuration: representative model should be adopted.
4.3 Test load
The test load shall be determined according to the requirements on the customer usage correlation or manufacturer design, and then conducted according to the method specified in GB/T 12534.
5 Test procedures
5.1 Parameter measurement and adjustment of the complete vehicle
5.1.1 Quality parameter measurement for the complete vehicle
The quality parameter measurement for the complete vehicle shall be carried out according to the method specified in GB/T 12674.
5.1.2 Parameter measurement and adjustment of vehicle wheel alignment
The parameter measurement and adjustment of vehicle wheel alignment shall be carried out according to the manufacturer's specifications on wheel alignment.
5.1.3 Parameter measurement for the trafficability of the complete vehicle
Parameter measurement for the trafficability (e.g. approach angle, departure angle, ramp angle and minimum ground clearance) shall be conducted according to the method specified in GB/T 12673.
5.1.4 Measurement and adjustment of key torque
The torque of fasteners in key parts shall be measured and adjusted according to the requirements of product instructions or design specifications. After the torque of fasteners is confirmed, their positions shall be marked.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Test conditions 5 Test procedures 6 Test data processing Annex A (Informative) Mileage distribution and load in vehicle reliability test Annex B (Informative) Specification design of accelerated reliability running test of customer usage correlation Annex C (Information) Inspection items of vehicle daily operation Annex D (Informative) Vehicle reliability running test record Annex E (Informative) Failure statistics and reliability statistics Annex F (Informative) Selection form of coefficient K Bibliography
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 12678-1990 Reliability running test method for motor vehicles. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 12678-1990:
a) The scope of the standard has been modified (see Clause 1; Clause 1 of Edition 1990);
b) The normative references have been modified (see Clause 2; Clause 2 of Edition 1990);
c) The terms and definitions of vehicle reliability, customer usage correlation, general reliability running test, accelerated reliability running test, vehicle failure, vehicle maintenance and repair, vehicle maintenance, and vehicle repair have been added (see 3.1~3.8);
d) The term and definition of equivalent number of failures have been modified (see 3.9; 3.6 in Edition 1990);
e) The terms and definitions of general reliability test, rapid reliability test, maintenance and repair after vehicle failure, preventive maintenance and repair, and potential vehicle failure have been deleted (see 3.1~3.5 of Edition 1990);
f) The requirements for the test vehicle have been added (see 4.2);
g) The requirements for parameter measurement and adjustment of test vehicle have been added (see 5.1);
h) The requirements for performance test for test vehicle have been modified (see 5.2; 6.4 of Edition 1990);
i) The requirements for mileage distribution in reliability test have been added (see 5.3.1.1, 5.3.2.1 and Annex A);
j) The requirements for driving operation during the test have been modified (see 5.3.1.2 and 5.3.2.2; 6.3.2.2 of Edition 1990);
k) The requirements for failure discovery, determination and process have been modified (see 5.4; 6.3.3 of Edition 1990);
l) The requirements for failure discovery during disassembly for inspection have been modified (see 5.6.7; 6.5.4 of Edition 1990);
m) The validity of reliability evaluation indicator and its calculation method have been deleted (see 7.4.6 of Edition 1990);
n) The specification design of accelerated reliability running test of customer usage correlation has been added (see Annex B);
o) Daily operation inspection items of vehicles have been added (see Annex C);
p) The records and statistics of vehicle reliability running test have been modified (see Annex D; Annex A of Edition 1990);
q) The failure statistics and reliability statistics have been modified (see Annex E; Annex A of Edition 1990);
r) The coefficient K to be multiplied when the confidence lower limit is calculated with fixed time censoring has been modified (see Annex F; Annex B of Edition 1990).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous editions of this document and documents replaced by this document are as follows:
——In 1977, it was first published as GB 1334-1977 Road test methods for trucks and off-road vehicles;
——The first revision was made in 1990 with the standard number changed to GB/T 12678, and the standard name changed to Reliability running test method for motor vehicles;
——This is the second revision.
Reliability running test method for motor vehicles
1 Scope
This standard specifies the test conditions, test procedure, test data processing and test reports for the reliability running test of motor vehicles.
This standard is applicable to all kinds of vehicles on the road, and to other types of vehicles by reference.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 12534 Motor vehicles — General rules of road test method
GB/T 12548 Motor vehicles speedometer and odometer calibration method
GB/T 12673 Motor vehicle main dimensions measurement method
GB/T 12674 Motor vehicles — Weight parameter — Measuring method
QC/T 900 Quality inspection and assessment method for products for complete motor vehicles
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
vehicle reliability
ability of a vehicle to perform the specified functions under specified conditions and within the specified time
3.2
customer usage correlation
reproduction of service load for the target customer in the testing ground or test stand
3.3
general reliability running test
reliability test carried out on the road of the non-testing ground according to certain specifications
3.4
accelerated reliability running test
reliability test with a certain acceleration coefficient and that is carried out on the road of the testing ground
Note: The acceleration coefficient refers to the ratio of the actual road mileage of customers to the test mileage of the testing ground under the condition of consistent accumulated damage.
3.5
vehicle failure
partial or complete incapacity of a vehicle
Note: Refer to GB/T 5624-2019, 5.1 for definition.
3.6
vehicle maintenance and repair
maintenance and repair for a vehicle
Note: Refer to GB/T 5624-2019, 2.4 for definition.
3.7
vehicle maintenance
operations to maintain a vehicle in good technical condition or working ability
Note: Refer to GB/T 5624-2019, 6.1 for definition.
3.8
vehicle repair
operations to restore the intact technical condition (or working ability) of a vehicle
Note: Refer to GB/T 5624-2019, 6.2 for definition.
3.9
equivalent number of failures
the number of general failures converted by a certain coefficient according to the failure category
4 Test conditions
4.1 Test environment
The general reliability running test and accelerated reliability running test shall be carried out under a variety of weather conditions, and vehicles used in special areas or for special purposes shall be tested under corresponding conditions (e.g. alpine areas, plateau areas, high-temperature dry-hot areas and high-temperature humid areas).
4.2 Test vehicle
4.2.1 The vehicle shall meet the technical requirements specified by the manufacturer.
4.2.2 The speedometer and odometer installed on the vehicle shall be inspected and corrected according to the method specified in GB/T 12548.
4.2.3 The number of vehicles: passenger vehicles shall not be less than 3, and the number of commercial vehicles and electric vehicles shall be determined by the manufacturers themselves.
4.2.4 Model configuration: representative model should be adopted.
4.3 Test load
The test load shall be determined according to the requirements on the customer usage correlation or manufacturer design, and then conducted according to the method specified in GB/T 12534.
5 Test procedures
5.1 Parameter measurement and adjustment of the complete vehicle
5.1.1 Quality parameter measurement for the complete vehicle
The quality parameter measurement for the complete vehicle shall be carried out according to the method specified in GB/T 12674.
5.1.2 Parameter measurement and adjustment of vehicle wheel alignment
The parameter measurement and adjustment of vehicle wheel alignment shall be carried out according to the manufacturer's specifications on wheel alignment.
5.1.3 Parameter measurement for the trafficability of the complete vehicle
Parameter measurement for the trafficability (e.g. approach angle, departure angle, ramp angle and minimum ground clearance) shall be conducted according to the method specified in GB/T 12673.
5.1.4 Measurement and adjustment of key torque
The torque of fasteners in key parts shall be measured and adjusted according to the requirements of product instructions or design specifications. After the torque of fasteners is confirmed, their positions shall be marked.
Contents of GB/T 12678-2021
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
5 Test procedures
6 Test data processing
Annex A (Informative) Mileage distribution and load in vehicle reliability test
Annex B (Informative) Specification design of accelerated reliability running test of customer usage correlation
Annex C (Information) Inspection items of vehicle daily operation
Annex D (Informative) Vehicle reliability running test record
Annex E (Informative) Failure statistics and reliability statistics
Annex F (Informative) Selection form of coefficient K
Bibliography
