| 摘要 |
<p>The pump controller determines pump load torques (Tr1, Tr2) from tilting signals (&thetas;1, &thetas;2) of hydraulic pumps(1,2) and delivery pressure signals (PD1, PD2) of the hydraulic pumps (1,2) based on Tr1 = K . &thetas;1 . PD1 and Tr2 = K . &thetas;2 . PD2 (K: constant), and adds these pump load torques to provide a resulting value as an engine load torque signal (T). Using the signal (T) and an engine revolution speed signal, an engine controller determines a fuel injecting rate to control a pre-stroke actuator. Simultaneously, the engine controller calculates target injection timing not to change fuel injection start timing, thereby controlling a timer actuator. This makes it possible to control the fuel injection rate with good response and high accuracy following load fluctuation, achieve improved combustion, and hold a fuel injection period within an optimum angle range. As a result, optimum combustion is achieved and such a deterioration of exhaust gas as the generation of NOx and black smoke can be avoided. <IMAGE></p> |
