QC/T 1261-2025 Automotive transmission control unit English, Anglais, Englisch, Inglés, えいご
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ICS
T
Professional Standard of the People's Republic of China
QC/T 1261-2025
Automotive transmission control unit
汽车变速器控制器（TCU）
(English Translation)
Issue date: 2025-12-17 Implementation date: 2026-07-01
Issued by the Ministry of Industry and Information Technology of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Technical Requirements
4 Technical Requirements
4.1 General Requirements
4.2 Basic Performance
4.3 System Functions
4.4 Electrical Loads
4.5 Mechanical Loads
4.6 Climatic Loads
4.7 Electromagnetic Compatibility
5 Test Methods
5.1 Test Conditions
5.2 Appearance and Dimensions
5.3 Basic Performance
5.4 System Functions
5.5 Electrical Loads
5.6 Mechanical Loads
5.7 Climatic Loads
5.8 Electromagnetic Compatibility
6 Inspection Rules
6.1 Classification of Inspection
6.2 Factory Inspection
6.3 Type Test
Appendix A (Informative) Arrhenius Model
A.1 Introduction to the Arrhenius Model
A.2 Example of the Arrhenius Model
Transmission Control Unit (TCU) for Automotive Vehicles
1 Scope
This document specifies the terms and definitions, technical requirements, test methods, and inspection rules for automotive transmission control units.
This document applies to automatic transmission control units for automotive vehicles.
2 Normative References
The contents of the following documents become essential provisions of this document through normative reference herein. For dated references, only the edition corresponding to that date applies. For undated references, the latest edition (including all amendments) applies.
GB/T 2423.3 Environmental Testing-Part 2: Test Methods-Test Cab: Damp Heat, Steady State
GB/T 2423.34-2012 Environmental Testing-Part 2: Test Methods-Test Z/AD: Composite Temperature/Humidity Cyclic Test
GB/T 14762-2008 Limits and Measurement Methods for Exhaust Pollutants from Heavy-Duty Gasoline Engines and Vehicles (China Stages III and IV)
GB/T 17691-2018 Limits and Measurement Methods for Exhaust Pollutants from Diesel Engines of Heavy-Duty Vehicles (China Stage VI)
GB/T 18352.6-2016 Limits and Measurement Methods for Emissions from Light-Duty Vehicles (China Stage VI)
GB/T 18655 Vehicles, Boats, and Internal Combustion Engines-Radio Disturbance Characteristics-Limits and Methods of Measurement for the Protection of On-board Receivers
GB/T 19951-2019 Road Vehicles-Electrical Disturbances from Electrostatic Discharge-Test Methods for Electrical/Electronic Subassemblies
GB/T 21437.2 Road Vehicles-Electrical Disturbances from Conduction and Coupling-Part 2: Electrical Transient Conduction Along Supply Lines Only
GB/T 21437.3 Road Vehicles-Electrical Disturbances from Conduction and Coupling-Part 3: Electrical Transient Transmission by Capacitive and Inductive Coupling via Lines Other Than Supply Lines
GB/T 28046.1 Road Vehicles-Environmental Conditions and Testing for Electrical and Electronic Equipment-Part 1: General
GB/T 28046.2-2019 Road Vehicles-Environmental Conditions and Testing for Electrical and Electronic Equipment-Part 2: Electrical Loads
GB/T 28046.3-2011 Road Vehicles-Environmental Conditions and Testing for Electrical and Electronic Equipment-Part 3: Mechanical Loads
GB/T 28046.4-2011 Road Vehicles-Environmental Conditions and Testing for Electrical and Electronic Equipment-Part 4: Climatic Loads
GB/T 28046.5 Road Vehicles-Environmental Conditions and Testing for Electrical and Electronic Equipment-Part 5: Chemical Loads
GB/T 30038 Road Vehicles-Degrees of Protection (IP Code) for Electrical and Electronic Equipment
GB/T 33014.1 Road Vehicles-Component Test Methods for Electrical Disturbances from Narrowband Radiated Electromagnetic Energy-Part 1: General
GB/T 33014.2 Road Vehicles-Component Test Methods for Electrical Disturbances from Narrowband Radiated Electromagnetic Energy-Part 2: Absorber-Lined Chamber
GB/T 33014.4 Road Vehicles-Component Test Methods for Electrical Disturbances from Narrowband Radiated Electromagnetic Energy-Part 4: Bulk Current Injection (BCI)
GB/T 33014.9 Road Vehicles-Component Test Methods for Electrical Disturbances from Narrowband Radiated Electromagnetic Energy-Part 9: Portable Transmitter
GB/T 34590 (all parts) Road Vehicles-Functional Safety
GB/T 42284.3-2022 Road Vehicles-Environmental Conditions and Testing for Electrical and Electronic Equipment for Drive System of Electric Vehicles-Part 3: Mechanical Loads
QC/T 1077 Terms and Definitions for Classification of Automotive Automatic Control Transmissions
ISO/SAE 21434 Road Vehicles-Cybersecurity Engineering
3 Terms and Definitions
The terms and definitions defined in GB/T 28046.1 and QC/T 1077, as well as the following, apply to this document.
3.1 Transmission Control Unit (TCU)
The electronic control unit for an automotive transmission.
3.2 Equivalence Classes Test
Dividing all input data into several parts (subsets) and then selecting a small number of representative data from each subset as test cases.
3.3 Fault Tolerant Time Interval
The minimum time interval from the occurrence of a fault in the item to the possible occurrence of a hazardous event, without the activation of a safety mechanism.
[Source: GB/T 34590.1-2022, 3.61]
4 Technical Requirements
4.1 General Requirements
4.1.1 Appearance and Dimensions
The appearance and dimensions of the TCU shall meet the following conditions:
a)The product's shape and dimensions shall comply with the requirements of the product drawings.
b) The product markings shall be correct, clear, and comply with the requirements of the product drawings.
4.1.2 Operating Conditions
Unless otherwise specified, the operating temperature range and operating voltage range of the TCU are as shown in Table 1 and Table 2 below.
Table 1 Operating Temperature
