| Abstract: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%. |