| 摘要 |
A control system for a compression ignition type diesel engine (1) comprises operating state detecting means (12, 13) for detecting the operating state of the diesel engine; combustion mode selecting means (31) for selecting in correspondence with the output of the operating state detecting means (12, 13) a first combustion mode, wherein fuel injection is carried out in the first half of the compression stroke, or a second combustion mode, wherein fuel injection is carried out at around compression top dead center; effective compression ratio varying means (24) for varying the effective compression ratio of the diesel engine; and control means (34) for controlling the effective compression ratio varying means (24) to lower the effective compression ratio when the first combustion mode is selected by the combustion mode selecting means compared to when the second combustion mode is selected. By this means, when the first combustion mode is selected by the combustion mode selecting means (31), by fuel injection being carried out in the first half of the compression stroke and the effective compression ratio being lowered so that compression ignition occurs at around compression top dead center, uniform highly diffuse premix combustion can be realized. And when the second combustion mode is selected by the combustion mode selecting means, by fuel injection being carried out at compression top dead center and ignition occurring at around compression top dead center substantially simultaneously with fuel injection, without the effective compression ratio being lowered, diffusion combustion is realized. <IMAGE> |
