Effect of fuel injection pressure on diesel particulate size and number distribution in a CRDI single cylinder research engine

► Particulates were investigated in a research engine at varying fuel injection pressures and timings. ► Particulate number concentration in the exhaust increases with increasing engine load. ► Increasing Pinj reduces the number and mass of particulates at all loads. ► At higher Pinj, advancing the injection timing reduces the particulate number concentration. ► Particulate surface area and volume distribution increases with load and decreases with increasing Pinj.