Isuzu Motors Limited

Yusuke Saigo

Futoshi Nakano

Koichiro Yomogida

Yuji Sasaki

The common rail fuel injection control device in accordance with the present invention computes a base duty (A) equivalent to a base target opening degree of a metering valve and a correction coefficient (B) based on the engine operation state, adds the value obtained by multiplying an oscillation duty (C) which oscillates periodically by the correction coefficient (B) to the base duty (A), and determines the final duty (D) equivalent to a final target opening degree of the metering valve.

Common rail fuel injection control device

The detected values of a common rail pressure that were detected by a pressure sensor are read within crank angle periods &#x394;t which are at least not more than half of a pumping cycle &#x394;T of a supply pump, the values detected within one pumping cycle preceding a reading time (for example, S(1), S(0), . . . S(&#x2212;4)) are averaged during each of the reading times, and the value thus obtained (for example, Pav()) is used as a common rail pressure after averaging processing, which is a representative value or a control value of the actual common rail pressure. The feedback control of common rail pressure is executed by using the values of common rail pressure after averaging processing thus computed by moving averaging. Consequently, the actual common rail pressure is converted into values suitable for control, and the feedback control of common rail pressure is executed with higher accuracy.

Growing community of inventors

Fujisawa, Japan

Yusuke Saigo