QC/T 1144-2021Oxygen sensor for motorcycles and mopeds (English PDF)
摩托车和轻便摩托车用氧传感器
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
March 5, 2021
Implementation date
July 1, 2021
Scope
QC/T 1144-2021 is the English-translated version of 摩托车和轻便摩托车用氧传感器.
QC/T 1144-2021 covers oxygen sensors for motorcycles and mopeds, specifying the requirements and the test methods for them. Terms and definitions are taken from QC/T 902 plus its own, and an oxygen sensor is defined as a device that detects the oxygen content in the engine exhaust and feeds a signal back to the electronic control unit.
The requirements clause is built around 4.4, the performance requirement covering response time and output voltage; the later requirements state that after the salt spray, anti-vibration, low-temperature resistance, high-temperature resistance and durability tests the sensor's performance shall still meet 4.4.
In the performance test the sensor is fitted to the exhaust pipe in the normal way, the exhaust gas temperature is measured 5 cm in front of the mounting position, and once the set temperature is reached the output voltage and the rich-to-lean and lean-to-rich response times are measured at air-fuel ratios of lambda = 0.90 to 0.97 and lambda = 1.05 to 1.10.
The tightness test applies 275 kPa to the exhaust side of the sensor at 20 degrees C to 30 degrees C and checks for leakage with a leak detector within 1 minute of the pressure becoming stable.
The wire tensile strength test applies 98 N plus or minus 2 N to the connecting wire joint for 30 s, after which response time and output voltage are measured again.
GB/T 2423.7-2018, GB/T 2423.17, GB/T 4208-2017 on IP degrees of protection, GB 14622-2016 and QC/T 902-2013 are cited as normative references.
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Document preview — QC/T 1144-2021
National Standard of the People's Republic of China
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword5
- 1 Scope6
- 2 Normative references6
- 3 Terms and definitions6
- 4 Requirements7
- 5 Test methods9
1 Scope
This document specifies the requirements and test methods for oxygen sensors for motorcycles and mopeds.
This document applies to oxygen sensors for motorcycles and mopeds (hereinafter referred to as oxygen sensors).
2 Normative references
The content of the following documents constitutes essential provisions of this document through normative references in the text. Among them, for the dated reference documents, only the version corresponding to the date is applicable to this document; for the undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 2423.7-2018 Environmental testing - Part 2: Test methods - Test Ec: Shock caused by rough operation (mainly used for equipment-type samples)
GB/T 2423.17 Environmental testing of electrical and electronic products - Part 2: Test method - Test Ka: Salt spray
GB/T 4208-2017 Degree of protection of enclosure (IP Code)
GB 14622-2016 Motorcycle pollutant emission limits and measurement methods (CHINA IV)
QC/T 902-2013 Specifications for electronically controlled fuel injection systems for motorcycles
3 Terms and definitions
The terms and definitions as defined in QC/T 902, as well as the following terms and definitions, apply to this document.
3.1 Oxygen sensor
A device, which is used to detect the oxygen content in the exhaust gas of the engine AND provides a feedback signal to the electronic control unit (ECU).
4.10 Anti-vibration performance
After the anti-vibration performance test of the oxygen sensor, the performance shall meet the requirements of 4.4.
4.11 Low-temperature resistance
After the oxygen sensor has undergone the low-temperature resistance test, its performance shall meet the requirements of 4.4.
4.12 High-temperature resistance
After the oxygen sensor has been tested for high-temperature resistance, its performance shall meet the requirements of 4.4.
4.13 Durability
After the oxygen sensor has been tested for durability, its performance shall meet the requirements of 4.4.
5 Test methods
5.1 Performance test
The oxygen sensor shall be installed on the exhaust pipe in the normal way. The temperature of the exhaust gas shall be measured 5 cm, in front of the installation position of the oxygen sensor. When the exhaust gas's temperature reaches the set value, measure the oxygen sensor's voltage and the response time of rich-to-lean and lean-to-rich, when the air-fuel ratio is lambda = 0.90 ~ 0.97 and lambda = 1.05 ~ 1.10.
5.2 Tightness test
In an environment of 20 °C ~ 30 °C, apply a pressure of 275 kPa to the exhaust side of the oxygen sensor. After the applied pressure is stable, use a leak detector, to check the leakage within 1 minute.
5.3 Tensile strength test of wire
The oxygen sensor shall be fixed. A tensile force of 98 N ± 2 N shall be applied to the connecting wire joint, for 30 s. Then, the response time and output voltage of the oxygen sensor shall be measured, according to the items specified in 4.4.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 2423.7-2018Environmental testing - Part 2: Test methods - Test Ec: Rough handling shocks, primarily for equipment-type specimens
- GB/T 2423.17Environmental testing - Part 2: Test methods - Test Ka: Salt mist
- GB/T 4208-2017Degrees of protection provided by enclosures (IP code)
- GB 14622-2016Limits and measurement methods for emissions from motorcycles (China V)
- QC/T 902-2013Technical specifications for electronically controlled fuel injection systems of motorcycles
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Related Standards
GB 14622-2016 — Limits and measurement methods for emissions from motorcycles (China stage IV)
GB/T 2423.17-2024 — Environmental testing - Part 2: Test methods - Test Ka: Salt mist
GB/T 2423.7-2018 — Environmental testing - Part 2: Test methods - Test Ec: Rough handling shocks, primarily for equipment-type specimens
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