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Engine control device

A control device and engine technology, applied in electrical control, engine control, fuel injection control, etc., can solve problems such as prone to deflagration and reduced engine output

Inactive Publication Date: 2014-12-17
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In an engine using two fuels with different octane numbers, if the engine control is performed based on the fuel with a higher octane number, knocking will easily occur when the other fuel is used.
In the case where engine control based on fuel with a low octane number (high energy density) is implemented, the output of the engine will decrease when another fuel is used

Method used

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  • Engine control device
  • Engine control device
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Examples

Experimental program
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Embodiment Construction

[0024] figure 1 In the illustrated engine 10 , a throttle valve 13 as an air volume adjustment unit whose opening is adjusted by a throttle actuator 12 such as a DC motor is provided in an intake passage 11 . The opening of the throttle valve 13 (throttle opening) is detected by a throttle opening sensor (not shown) built into the throttle actuator 12 .

[0025] The engine 10 includes a CNG injection valve 14 for injecting gaseous fuel (CNG fuel) and a gasoline injection valve 15 for injecting liquid fuel (gasoline fuel) as fuel injection units for injecting and supplying fuel to each cylinder of the engine 10 . In the present embodiment, an intake port injection engine is adopted, and the CNG injection valve 14 and the gasoline injection valve 15 are both arranged in the vicinity of the intake port. In this system, the CNG injection valve 14 and the gasoline injection valve 15 are directly attached to the intake pipe of the engine 10 .

[0026] An intake valve 16 and an exh...

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Abstract

An engine (10) is provided with fuel by a CNG injection valve (14) serving as a first injection section for injecting a first fuel and by a gasoline injection valve (15) serving as a second injection section for injecting a second fuel of a different octane rating than that of the first fuel. Provided to the engine (10) is an intake-side valve drive mechanism (21) serving as an intake valve control section for altering a valve-closed period for an intake valve (16) on the basis of the engine operating state. If the first fuel is being supplied alone or together with the second fuel to the engine (10), then an ECU (50) causes the valve-closed period of the intake valve (16) to be closer to an intake bottom dead center of the engine (10) and changes the actual compression ratio of the engine (10) so that ratio increases, in comparison to a case where the second fuel alone is being supplied.

Description

[0001] Cross References to Related Applications [0002] The present invention is based on Japanese Application No. 2012-92007 filed on April 13, 2012 and Japanese Application No. 2013-36442 filed on February 26, 2013, and the contents thereof are incorporated herein. technical field [0003] The present invention relates to an engine control device, and more specifically, to an engine control device applicable to an engine capable of using two types of fuel with different octane numbers. Background technique [0004] As the fuel for the engine, gaseous fuels such as compressed natural gas (CNG) and hydrogen fuel, alcohol fuels, and the like can be used as alternative fuels instead of gasoline. These alternative fuels are used alone or together with gasoline as fuel for engines. Patent Document 1 discloses a technique for reducing the temperature in the combustion chamber by closing the intake valve before reaching the intake bottom dead center in a gas engine using gaseous...

Claims

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Application Information

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IPC IPC(8): F02D13/02F02D19/06F02D19/08F02D41/02F02D41/22
CPCF02D13/02F02D13/0215F02D15/00F02D19/06F02D19/0647F02D41/0025F02D41/0027F02D2041/001Y02T10/12Y02T10/30
Inventor 野野山和贤竹村优一沟渕刚史和田实福田圭佑
Owner DENSO CORP