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Fuel injection control device for internal-combustion engine

A fuel injection and control device technology, applied in the directions of fuel injection control, engine control, electrical control, etc., can solve problems such as fuel pressure drop, inability to ensure fuel pressure, and inability to control fuel pressure.

Active Publication Date: 2019-05-07
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the pressurization operation of the fuel pump is completely stopped, the fuel pressure cannot be controlled, so the fuel pressure may drop excessively. In this case, there is a concern that the fuel pressure required for re-acceleration after deceleration cannot be ensured.

Method used

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  • Fuel injection control device for internal-combustion engine
  • Fuel injection control device for internal-combustion engine
  • Fuel injection control device for internal-combustion engine

Examples

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Embodiment Construction

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Such as figure 1 with figure 2 As shown, a fuel injection control device 1 to which the present invention is applied has an ECU (Electronic Control Unit) 2 and executes various control processes including fuel injection control and the like of an internal combustion engine (hereinafter referred to as "engine") 3 .

[0043] The engine 3 is, for example, a gasoline engine having four cylinders 3 a (only one is shown), and is mounted on a vehicle (not shown) as a power source. An intake pipe 4 and an exhaust pipe 5 are connected to each cylinder 3a, and the intake valve 6 and the exhaust valve 7 provided on the intake port and the exhaust port of the intake pipe 4 and exhaust pipe 5 are controlled by the intake camshaft respectively. 8 and exhaust camshaft 9 drives.

[0044] Further, a fuel injection valve (hereinafter referred to as "injector") 10 i...

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Abstract

Provided is a fuel injection control device for an internal-combustion engine, even when deceleration is performed in the acceleration state, the fuel pressure can be quickly and accurately lowered during deceleration, and the lower limit of the injection valve flow rate can be prevented from sticking. In the present disclosure, pressurized fuel is directly injected from a fuel injection valve (10) into a cylinder (3a), and a fuel pressure PF is controlled to a target fuel pressure PFCMD. A target fuel pressure PFCMD1 (step 17, figure 9) during early depressurization is calculated on the basisof a target amount GAIRCMD of intake air that is a target load of an internal-combustion engine (3), a target fuel pressure PFCMD2 (step 11, figure 5) during a normal state is set on the basis of anactual amount GAIRACT of intake air that is an actual load of the internal-combustion engine (3), and a lower one of the target fuel pressure PFCMD1 during early depressurization and the target fuel pressure PFCMD2 during a normal state is set as the target fuel pressure PFCMD (steps 18, 15, 19).

Description

technical field [0001] The present invention relates to a fuel injection control device for an internal combustion engine that directly injects pressurized fuel from a fuel injection valve into a cylinder and controls the pressure of the fuel supplied to the fuel injection valve to a target fuel injection pressure. pressure. Background technique [0002] In the case of using the above-mentioned direct injection fuel injection valve, generally, the fuel is pressurized at a high pressure by a fuel pump, and the pressure of the fuel supplied to the fuel injection valve (hereinafter simply referred to as "fuel pressure" ) feedback control is the target fuel pressure set according to the actual speed and load of the internal combustion engine. On the other hand, the fuel injection valve has a lower limit valve opening time at which the valve opening time cannot be further shortened due to its valve opening characteristics. Therefore, for example, when the load and the target fu...

Claims

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Application Information

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IPC IPC(8): F02D41/12F02D41/38
CPCF02D41/18F02D41/3845F02D41/045F02D2250/31F02D2041/389F02D41/12F02D41/38
Inventor 中岛昌俊堤优二郎饭生顺也三木健太郎中岛徹釜濑启太
Owner HONDA MOTOR CO LTD
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