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Idle rotation speed control device for bifuel engine

A dual-fuel engine, idle speed technology, applied in the direction of engine control, combustion engine, fuel injection control, etc., can solve the problems of reduction of air intake, deterioration of gas fuel combustion, reduction of engine speed, etc., to prevent the reduction of idle speed , the effect of suppressing the reduction of the intake air volume

Inactive Publication Date: 2012-12-12
AISAN IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Here, in the state where the engine is operated using liquid fuel, when switching from liquid fuel to gaseous fuel, compared with the case of using liquid fuel, the amount of intake air decreases because of the relationship with the compression ratio of the engine. Combustibility of gaseous fuel may deteriorate
Especially when idling, it is possible that the engine speed will decrease and the idling stability will be damaged

Method used

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  • Idle rotation speed control device for bifuel engine
  • Idle rotation speed control device for bifuel engine
  • Idle rotation speed control device for bifuel engine

Examples

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no. 1 approach

[0030] Hereinafter, the first embodiment embodying the idling speed control device of the dual fuel engine of the present invention will be described in detail with reference to the drawings.

[0031] in figure 1 Here, a schematic configuration diagram shows a dual fuel engine system including the idle speed control device of the present invention. The multi-cylinder engine 1 explodes and burns a combustible mixture of fuel and air supplied through the intake passage 2 in the combustion chamber 3 of each cylinder, and discharges the combusted exhaust gas from the exhaust passage 4. As a result, the engine 1 operates the piston 5 to rotate the crankshaft 6 to obtain power.

[0032] The air purifier 7 provided at the entrance of the intake passage 2 purifies the air sucked into the passage 2. The electronic throttle device 8 provided in the intake passage 2 corresponds to the intake volume adjustment unit of the present invention, and operates to control the amount of air (intake v...

no. 2 approach

[0068] Next, a second embodiment embodying the idling speed control device of the dual fuel engine of the present invention will be described in detail with reference to the drawings.

[0069] This embodiment is different from the first embodiment in the processing content of the ISC. in Figure 4 In the flowchart, the processing content of the ISC executed by the ECU 50 is shown. In this embodiment, the ECU 50 corresponds to the control unit, the first correction unit, the second correction unit, the first lower limit value calculation unit, and the second lower limit value calculation unit of the present invention.

[0070] When the processing is transferred to this routine, in step 300, the ECU 50 reads the throttle opening TA, the intake pressure PM, the engine speed NE, the cooling water temperature THW, and the oxygen concentration Ox from various sensors 41 to 45. Kind of signal.

[0071] In step 310, the ECU 50 calculates various correction values ​​QK. Here, the various c...

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Abstract

Disclosed is an idle rotation speed control device for a bi-fuel engine, wherein an electronic throttle device for adjusting the air intake quantity during an idle operation is provided in an intake passage of a bi-fuel engine. An electronic control unit (ECU) controls the electronic throttle device on the basis of a control value so that the idle rotation speed reaches a target idle rotation speed. When an idle operation using gasoline is switched to an idle operation using CNG, the ECU corrects the calculated control value on the basis of a correction value, to correct the air intake quantity in accordance with the use of CNG Furthermore, the ECU adjusts the air intake quantity by controlling the electronic throttle device on the basis of the corrected control value.

Description

Technical field [0001] The present invention relates to a dual-fuel engine that is operated by switching between a first fuel and a second fuel of different types, and in particular to an idling speed control device for controlling the idling speed of the dual-fuel engine. Background technique [0002] Conventionally, for example, there is known a dual-fuel engine that operates by switching between liquid fuels such as gasoline and gas fuels such as compressed natural gas (CNG). As such a technique, for example, Patent Document 1 described below describes a technique for controlling the idle rotation speed of the engine. [0003] Here, when the liquid fuel is used for the operation of the engine, when switching from liquid fuel to gas fuel, compared with the case of using liquid fuel, the intake air volume is reduced. Because of the relationship with the compression ratio of the engine, The combustibility of gas fuel may deteriorate. Especially when idling, the engine speed may d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/06F02D41/04
CPCF02D31/003F02D19/0615F02D19/061F02D19/0692Y02T10/36F02D19/0647F02D41/0027Y02T10/30
Inventor 白泽宏哲菰田孝夫筒井大辅
Owner AISAN IND CO LTD