This part of GB/T 8190 specifies the fuel recommended for the implementation of GB/T 8190.4 emission test cycle. This Part of GB/T 8190 applies to reciprocating internal combustion engines for mobile, mobile and stationary installations, but does not include vehicle engines designed primarily for road use. This part of GB/T 8190 is also applicable to engines for other purposes such as earth-moving machinery and generator sets. Standard fuels usually represent specific commercial fuels, but have fairly strict specifications. It is mainly recommended for the test bench measurement described in GB/T 8190.1-1999. For the emission measurement of commercial fuels that are generally used on site, regardless of whether the fuel is listed in this part of GB/T 8190, it is recommended to use the general performance analysis data sheet (see Chapter 5), and the measured fuel performance and emission measurement results together Write report.