Fuel injection control device and fuel injection system
A technology of control device and fuel injection, which is applied in the direction of fuel injection device, fuel injection control, charging system, etc., and can solve the problems of different correction and discrimination results, etc.
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no. 1 Embodiment approach
[0031] figure 1 The illustrated fuel injection valve 10 is mounted on an internal combustion engine (gasoline engine) and injects fuel directly into a combustion chamber 2 of the internal combustion engine. Specifically, a mounting hole 4 into which the fuel injection valve 10 is inserted is formed in the cylinder head 3 forming the combustion chamber 2 . The fuel supplied to the fuel injection valve 10 is pressure-fed by a fuel pump P driven by the rotational driving force of the internal combustion engine.
[0032] Such as figure 2 As shown, the fuel injection valve 10 is configured to include a main body 11 , a valve body 12 , a coil 13 , a fixed core 14 , a movable core 15 , an injection hole main body 17 , and the like. The main body 11 is formed of a metal magnetic material so that a fuel passage 11 a is formed inside. The main body 11 accommodates the valve body 12 , the fixed core 14 and the movable core 15 inside, and holds the injection hole main body 17 .
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no. 2 Embodiment approach
[0083] In the above-mentioned first embodiment, by Image 6 In step S30 of , the target injection amount is set so that the end time t31 of the energization time Ti becomes a time out of the peak occurrence range. On the other hand, in the present embodiment, the target injection amount is set so that the end timing t31 of the energization time Ti becomes a timing out of the intersection occurrence ranges W2 and W3 described below.
[0084] That is, if Figure 7 As shown, the points where the characteristic lines L1, L2, and L3 intersect each other are called intersection points P1, P2. exist Figure 7 , the intersections of characteristic lines L1 and L2, the intersections of characteristic lines L1 and L3, and the intersections of characteristic lines L2 and L3 are shown at the same positions (positions of symbols P1 and P2), respectively. However, strictly speaking, these intersections occur at different locations. Also, the ranges in which the intersection points P1 an...
no. 3 Embodiment approach
[0089] This embodiment is a modified example of the first embodiment. In this embodiment, if Figure 8 As shown, the microcomputer 21 provides a precharge control unit 21d described below. That is, the microcomputer 21 controls the integrated IC 22 so as to perform precharging for applying the battery voltage to the coil 13 before applying the boosted voltage by the boost control unit 21 a. The microcomputer 21 during such control corresponds to the "precharge control unit 21d".
[0090] In order to carry out precharging, the integrated IC 22 controlled by the microcomputer 21 turns on the switching element SW4 and turns on / off the switching element SW4 to maintain the coil current at the fourth target value I4 (see Figure 9 (a)). The fourth target value I4 is set to a value smaller than the third target value I3 (refer to Figure 9 (b). More specifically, at a time t0 that is a predetermined time before the time t10 at which the rising control is started, the precharge ...
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