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Engine control system

A control system and engine technology, applied in engine control, combustion engine, machine/engine, etc., can solve the problem that engine ECU research and development efficiency is not so high

Active Publication Date: 2013-01-02
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the cost reduction of the engine ECU is limited
In addition, the research and development efficiency of the engine ECU is not so high

Method used

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  • Engine control system
  • Engine control system
  • Engine control system

Examples

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no. 1 example ）

[0068] Such as figure 1 As shown in , an engine control system 10 of the first embodiment of the present disclosure includes a plurality of fuel injectors IJ1 to IJ4 (fuel injection devices) and an engine ECU (Electronic Control Unit) 11 . Each fuel injector IJ1 to IJ4 is provided in each cylinder #1 to #4 of the diesel engine 13 installed in the vehicle. In the present embodiment, the diesel engine 13 (hereinafter, the engine 13 ) has four cylinders. The engine ECU 11 controls the fuel injectors IJ1 to IJ4 , thereby controlling fuel injection to the engine 13 .

[0069] A plurality of fuel supply pipes 17 (fuel passages) extending from a fuel outlet of a common rail 15 , which is a container accumulating high-pressure fuel, is connected to each of the fuel injectors IJ1 to IJ4 . Fuel from a fuel tank 19 of the vehicle is drawn into a fuel pump 21 and the pressurized fuel is supplied to the common rail 15 . High-pressure fuel is then supplied from the common rail 15 to the...

no. 2 example ）

[0139] In the engine control system 10 of the first embodiment, the microcomputer 31 of the engine ECU 11 detects the common rail fuel pressure based on a signal from a common rail pressure sensor (not shown) as one of information used for calculating the injection command value ( One of the parameters for the operation state). That is, the microcomputer 31 calculates an injection command value based on the common rail fuel pressure. This is because the relationship between the injection duration (driving duration) and the fuel injection amount varies depending on the common rail fuel pressure (ie, the fuel pressure supplied to the respective fuel injectors IJ1 to IJ4 ).

[0140] In the case where the common rail fuel pressure sensor is not provided, the present disclosure (second embodiment) can be modified in the following manner.

[0141] Such as Figure 8 As shown in , in the engine control system 70 of the second embodiment, at least one of the fuel injectors IJ1 to IJ4...

no. 3 example ）

[0151] The engine control system 72 of the third embodiment of the present disclosure differs from the engine control system of the first embodiment in the following points.

[0152] The microcomputer 51, communication circuit 53, A-D converter 55, and drive circuit 57 of the first embodiment are not provided in the fuel injectors IJ1 to IJ4 of the third embodiment.

[0153] Alternatively, an electronic driver unit (EDU) 75 is provided between the engine ECU 11 and the respective fuel injectors IJ1 to IJ4. The EDU 75 (which is also called an injection drive unit) drives the actuator 25 of each fuel injector IJ1 to IJ4 based on each injection command value for each cylinder from the engine ECU 11 to inject fuel from each fuel injection fuel for devices IJ1 to IJ4.

[0154] The EDU 75 includes a microcomputer 81, a communication circuit 83, an A-D converter 85, and a drive circuit 87. The microcomputer 81 communicates with the engine ECU 11 through the communication circuit 83....

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Abstract

Injection command information is transmitted from an engine control unit (11) to each fuel injector (IJ1 to IJ4). The fuel injector has a fuel pressure sensor (27), an A-D converter (55) used for converting a sensor signal A-D from the fuel pressure sensor (27) into a digital signal, and a microcomputer (51). The microcomputer (51) executes the processing used for detecting fuel injection characteristics based on the detected fuel pressure, the processing used for calculating a corrected value based on the fuel injection characteristics, and the processing used for correcting the injection command information from the engine control unit (11) based on the corrected value. An actuator (25) of the each fuel injector operates according to the corrected injection command information.

Description

technical field [0001] The present disclosure relates to an engine control system for controlling fuel injection to an internal combustion engine. Background technique [0002] In a control system for a diesel engine installed in a vehicle, for example as disclosed in Japanese Patent Laid-Open No. 2008-144749(A) or Japanese Patent Laid-Open No. 2009-57928(A), a fuel pressure sensor is provided in a common In a predetermined position of a fuel passage between a fuel outlet of a fuel rail, which is a fuel container that accumulates high-pressure fuel pumped from a fuel pump, and a fuel injection port of a fuel injection device (ie, a fuel injector). The voltage value of the sensor signal output from the fuel pressure sensor is A-D-converted every predetermined time, and the A-D-converted digital value is read to continuously detect the fuel pressure, which varies with each fuel injection from the fuel injection port . Then, the fuel injection characteristic is detected based...

Claims

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Application Information

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IPC IPC(8): F02D41/04F02D41/30
CPCF02D41/40F02D41/30F02D41/402Y02T10/44F02D41/04F02D2250/04F02D2200/0602Y02T10/40
Inventor 日置敏和金子正幸吉田知史汤川鹏翔
Owner DENSO CORP