Overview
ISO 17447-3:2015 is an international standard published by ISO that specifies the tests and requirements for sheath-type glow-plugs with conical seating and their cylinder head housings. It applies to glow-plugs conforming to ISO 17447-1 and ISO 17447-2, mainly used in diesel (compression ignition) engines. This standard ensures glow-plugs meet reliable performance standards through comprehensive testing methods agreed upon by glow-plug manufacturers and engine manufacturers.
The standard replaces earlier individual standards for glow-plugs by consolidating test procedures and requirements into one document, enabling consistent quality, durability, and functional performance across the automotive industry.
Key Topics
ISO 17447-3 covers critical aspects of glow-plug testing and performance, including:
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Gas Tightness Test
Ensures the glow-plug sheath resists gas leakage under pressure (4 MPa), maintaining engine integrity with a maximum allowable leakage of 2 cm³/min.
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Thermal Characteristics
Defines how glow-plugs heat up and maintain temperature. Testing includes measuring the hottest point within a designated zone and ensuring agreed temperature/time profiles for reliable ignition.
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Electrical Resistance Testing
Measures the glow-plug's electrical resistance at room temperature, an important indicator of its health and performance.
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Current Characteristics
Records the electrical current consumed during startup and thermal equilibrium to verify consistency and efficiency under operation.
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High Voltage Endurance
Tests glow-plugs at 130% of nominal voltage for 15 seconds to assess durability under higher than normal electrical stress.
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Vibration Testing
Uses sinusoidal vibration tests according to IEC 60068-2-6 to simulate engine conditions, ensuring mechanical robustness and resistance to vibration-induced failure.
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Endurance Testing
Long-term cycling tests under agreed conditions evaluate the glow-plug's lifecycle and reliability in real-world operational environments.
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Marking and Labeling
Requires permanent marking of nominal voltage and manufacturer identification to support traceability and standard compliance.
Applications
ISO 17447-3:2015 is essential for:
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Diesel Engine Manufacturers
Ensuring glow-plug components meet stringent test requirements for performance and durability in high-compression engines.
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Glow-plug Manufacturers
Guiding production and quality assurance processes through standardized testing and performance benchmarks.
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Automotive Component Suppliers
Validating parts compliance for integration into diesel vehicle cylinder heads, promoting interchangeability and reliability.
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Testing Laboratories
Implementing standardized assessment protocols for gas tightness, thermal behavior, electrical resistance, and vibration resilience.
By adhering to ISO 17447-3, stakeholders can enhance diesel engine cold start efficiency, minimize emissions, and improve overall engine performance.
Related Standards
ISO 17447-3 is part of the ISO 17447 series focused on glow-plugs:
- ISO 17447-1 - Basic characteristics and dimensions for metal-sheath-type glow-plugs
- ISO 17447-2 - Basic characteristics and dimensions for ceramic-sheath-type glow-plugs
Additionally, the standard references:
- IEC 60068-2-6 - Environmental testing, specifically sinusoidal vibration testing methods critical to verifying glow-plug mechanical durability.
Together, these standards provide a comprehensive framework for the design, testing, and use of glow-plugs with conical seating to meet international automotive quality and safety requirements.
Keywords: ISO 17447-3, glow-plugs, diesel engines, sheath-type glow-plugs, thermal characteristic, electrical resistance, vibration testing, gas tightness, automotive standards, conical seating, cylinder head housing, diesel engine components, engine manufacturer, glow-plug testing.