What does dual idle speed mean?

[McRicardo]

Automotive dual idle speed is an exhaust emission detection system. The automotive dual idle speed emission detection system adopts mature five-component exhaust gas analyzers and OBDII interface technology, integrating exhaust analysis, result output, and data statistics into one comprehensive exhaust emission detection system. It is primarily used in automobile manufacturing enterprise testing lines, large-scale inspection stations, and other scenarios, applicable to exhaust emission index inspections for all light-duty vehicles, ensuring that vehicle emission testing achieves completeness, standardization, and normalization to meet national requirements for exempted vehicles in terms of emissions. System functions: 1. Supports dual idle speed measurement modes, applicable to both high and low idle speed conditions. 2. Capable of measuring HC, CO, CO2, NOx, and calculating the air excess index (with smoke measurement for diesel vehicles). 3. Can extract oil temperature and speed data through the OBD interface, suitable for both automatic and manual modes. 4. In case of OBD port failure, it can reduce usage by employing oil temperature and speed sensors.