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Fuel injection controlling apparatus for internal combustion engine

A technology for fuel injection and control equipment, which is applied in the direction of fuel injection control, mechanical equipment, engine control, etc., and can solve problems such as difficult control and inability to properly control combustion conditions.

Inactive Publication Date: 2008-11-12
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, you will not get absolute deviations from the ideal
Therefore, the combustion conditions in each cylinder cannot be properly controlled
For example, when the crankshaft speed of each cylinder deviates from the ideal speed in the same direction, it is difficult to perform proper control

Method used

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  • Fuel injection controlling apparatus for internal combustion engine
  • Fuel injection controlling apparatus for internal combustion engine
  • Fuel injection controlling apparatus for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0025] figure 1 is a schematic view of the common rail fuel injection system. The multi-cylinder diesel engine 10 is provided with an electromagnetic fuel injector 11 for each cylinder, and the fuel injector communicates with a common rail 12 . A high-pressure pump 13 supplies high-pressure fuel into the common rail 12 . The common rail 12 stores high-pressure fuel whose pressure is equal to the injection pressure. The engine 10 drives a high pressure pump 13 . The high-pressure pump 13 is provided with a suction control valve 13a. The supply pump 14 pumps up the fuel in the fuel tank 15 . The suction control valve 13 a is electromagnetically driven to adjust the amount of fuel supplied to the high-pressure pump 13 .

[0026] The common rail 12 is provided with a common rail pressure sensor 16 which detects the fuel pressure in the common rail 12 . The common rail 12 is also provided with a relief valve (not shown), which relieves excess pressure within the common rail 1...

no. 2 example

[0105] refer to Figure 11 and 12 , the second embodiment is described hereinafter. Figure 11 is a flowchart showing a procedure for correcting the dispersion of the fuel injection amount among cylinders. In step S10, measure out Figure 13 The current rotation speed shown. Specifically, the current rotation speed is obtained from the pulse interval between the first rotation angle (ATDC42 degrees) and the second rotation angle (ATDC72 degrees). In step S20, it is determined whether this value is in the same region as the previous value. For example, if Figure 6 As shown, it is determined whether the currently measured data (current rotational speed) and the previously measured data are in the same region with respect to the plurality of regions defined in the data map A having the rotational speed and the coordinate axis of the fuel injection quantity. When the answer is YES in step S20, the process proceeds to step S30. When the answer is NO in step S20, the proces...

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Abstract

A sensor signal from a speed sensor (18) is inputted into an ECU (20). The ECU (20) calculates a rotation speed of a crankshaft (17) in a predetermined period based on the sensor signal. The rotation speed is filtered by a frequency which is defined based on a combustion frequency of the engine (10) to obtain a value corresponding to a current torque. The ECU (20) calculates a workload of each cylinder based on the value corresponding to the current torque, and controls characteristic of each cylinder based on the workload.

Description

technical field [0001] The present invention relates to a fuel injection control device for an internal combustion engine. Specifically, the device performs control in which the dispersion of the rotational speed of the crankshaft among the cylinders is restricted. Background technique [0002] Individual differences in injectors or variances in valve timing of intake / exhaust valves can create variances in the rotational speed of each cylinder. JP-6-50077B discloses that the fuel injection amount is corrected so as to average the rotation speed of each cylinder by detecting a change in the rotation speed (rotational angular velocity). However, correction of the fuel injection amount is performed only when the engine is stable such as at idle. That is, when the engine is operated at various speeds, the dispersion of the rotation speed among the cylinders cannot be corrected, so that the emission increases and the drivability is not good. [0003] JP-8-218924A discloses tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/30F02D41/40
CPCY02T10/44
Inventor 石塚康治中田谦一郎川村淳
Owner DENSO CORP