Fuel injection controller for internal-combustion engine

Abstract

Abstract PURPOSE:To ensure satisfactory firing and prevent the occurrence of noises and vibration by quickening the injection period of pilot injection as engine temperature is lowered. CONSTITUTION:Pilot injection is carried out in low load and speed running. That is, the number (n) of times of fuel injection is determined by the rotational frequency N of engine, load L, etc. and the pilot injection is carried out in n>1 before main injection. And the basic pilot injection amount tauP0 determined by said rotational frequency N and load L is corrected by water temperature correction factor K6 which is increased as water temperature T is lowered so as to obtain pilot injection amount tauP. Also, pilot injection starting period tauc is enlarged, i.e. quickened as water temperature T is lowered. Thus, since the lower engine temperature is, the more the atmization of injected fuel is degraded, the injection period of pilot injection is quickened and injection amount is increased so much that satisfactory firing is ensured and thus the occurrence of noises and vibration can be blocked.

Inventors

• 👤 Takashi Takahashi
• 👤 岳志 高橋

Bibliographic Details