FUEL INJECTION CONTROL DEVICE

• Main Author: FURUKAWA HIDEYUKI
• Format: Patent
• Language: English; Japanese
• Published: 06.08.2015
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

PROBLEM TO BE SOLVED: To provide a fuel injection control device which can determine whether or not a fuel injection amount is in a deviated state with respect to a fuel injection amount target value under a wide operation condition.SOLUTION: When an engine is in a stationary operation state during the execution of cruise control, an electronic control device temporarily changes fuel pressure in a common rail. Then, when the fuel pressure is changed as above, a difference between a fuel injection amount target value Q0t before the change of the fuel pressure, and a fuel injection amount target value Q1t after the change of the fuel pressure is obtained, and when the difference is not smaller than a prescribed threshold, a fuel injection amount is determined to be in a deviated state with respect to the fuel injection amount target value. By this constitution, the determination becomes possible under a wide operation condition irrespective of a magnitude of an engine load. 【課題】燃料噴射量が燃料噴射量目標値に対して乖離した状態になっているか否かを、幅広い運転条件の下で判定することができる燃料噴射制御装置を提供する。【解決手段】電子制御装置は、クルーズコントロール制御の実行中においてエンジンが定常運転状態にある場合に、コモンレール内の燃料圧力を一時的に変化させる。そして、そのようにして燃料圧力を変化させた際に、その燃料圧力変化前の燃料噴射量目標値Ｑ０ｔと燃料圧力変化後の燃料噴射量目標値Ｑ１ｔとの差を求め、その差が所定の閾値以上である場合に、燃料噴射量が燃料噴射量目標値に対して乖離した状態になっていると判定する。これにより、その判定を、エンジン負荷の大小に拘わらず幅広い運転条件の下で行うことが可能である。【選択図】図２