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Idle rotation speed control device for bifuel engine

A dual-fuel engine, idling speed technology, applied in the direction of engine control, combustion engine, fuel injection control, etc., can solve the problems of deterioration of combustibility of gaseous fuel, reduction of engine speed, reduction of air intake, etc.

Inactive Publication Date: 2015-04-29
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

[0021] Hereinafter, a first embodiment embodying an idling rotation speed control device for a dual-fuel engine according to the present invention will be described in detail with reference to the drawings.

[0022] exist figure 1 In , a dual-fuel engine system including the idle rotation speed control device of the present invention is shown by a schematic configuration diagram. A multi-cylinder engine 1 explodes and combusts a combustible mixture of fuel and air supplied through an intake passage 2 in a combustion chamber 3 of each cylinder, and discharges the combusted exhaust gas from an exhaust passage 4 . As a result, the engine 1 operates the piston 5 to rotate the crankshaft 6 to obtain power.

[0023] The air cleaner 7 installed at the inlet of the air intake passage 2 cleans the air sucked into the passage 2 . The electronic throttle device 8 provided in the air intake passage 2 corresponds to the air intake volume adjusting means of the present invention, and ope...

no. 2 approach

[0059] Next, a second embodiment embodying the idle rotation speed control device for a dual-fuel engine of the present invention will be described in detail with reference to the drawings.

[0060] This embodiment differs from the first embodiment in terms of the processing content of the ISC. exist Figure 4 In , the processing content of the ISC executed by the ECU 50 is shown by a flowchart. In the present 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.

[0061] When the process shifts 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 the various sensors 41 to 45. kind of signal.

[0062] In step 310, ECU 50 calculates various correction values ​​QK. ...

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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 operated by switching between different types of first fuel and second fuel, and more specifically, to an idle speed control device for controlling the idle speed of the dual-fuel engine. Background technique [0002] Conventionally, for example, there is known a dual-fuel engine that operates by switching between a liquid fuel such as gasoline and a gaseous fuel such as compressed natural gas (CNG). As such a technique, for example, Patent Document 1 described below describes a technique of controlling the idle rotation speed of an engine. [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 during idling operation, there ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D19/06F02D41/04
CPCF02D19/061F02D19/0615F02D19/0647F02D19/0692F02D31/003F02D41/0027Y02T10/30
Inventor 白泽宏哲菰田孝夫筒井大辅
Owner AISAN IND CO LTD