| 摘要 |
A close loop control fuel injection method obtains an injection quantity and an injection timing by calculating a heat release rate (HRR) from a combustion pressure signal of a combustion pressure sensor after injecting a relevant fuel amount of a pilot at a warm up state of an engine. By regulating the injection quantity and the injection timing to follow a command value, the inaccuracy of closed loop calibration and the danger of exceeding emission (EM) regulations, occurring simply using a combustion pressure diagram, can be completely removed through a previously defined stable condition. [Reference numerals] (A) Pilot injection quantity closed loop control;(B) Main injection quantity closed loop control;(S10) Cooling water temperature>90 deg C? Fuel cut?;(S20) Rail press 1=300/600/900/1200/1600bar/Max press pilot injection quantity=1.5mg/st;(S21) Obtain HRR height (H) 1, Injection quantity 1, Injection timing 1;(S22) Rail press 2=Rail press 1+dP, Injection quantity 2= Injection quantity 1+dq Injection timing 2= Injection timing 1+dt, HRR H 2;(S23) HRR H 2 Injection quantity 2=ref? Injection timing 2=ref?;(S24) Rail press>Max press?;(S30) Rail press=300/600/900/1200/1600bar/Max press? ET>500us?;(S31) Repeat at each rail press step;(S40) Update a map requiring the injection quantity of the entire area |
