In this engine, the compression ratio was reduced to 17.4:1 with high pressure and multiple diesel injections. The multiple injections consist of pilot injection and the main injection, in order to shorten the ignition delay, reduce the noise, and  emission.
In this engine, the compression ratio is lowered to 17.4:1 under high pressure and involves multiple diesel injections. The multiple injections include a primary injection and the main injection, with the goal of shortening ignition times, reducing sound levels, and decreasing emissions.