Using the test matching method

the influence of key fuel injection parameters

such as fuel injection mode

injection timing

fuel injection ratio

and injection pressure on soot emissions was studied on a test bench with a 1.5L turbocharged direct injection gasoline engine. The test results show that for the single injection mode

the earlier the injection at part load

the more the soot emissions. At full load

the later the injection

the more the soot emissions. In the multiple injection mode

with the delay of first injection

soot emissions decrease

and with the delay of second and third injections

soot emissions increase. Increasing the injection pressure will not obviously improve the combustion and emissions under part load conditions

but will significantly reduce the soot and total hydrocarbon emissions under mapping conditions

and with the acceleration of combustion process in the cylinder and the improvement of combustion stability

brake specific fuel consumption will be reduced by approximately 2%.