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Variable compression ratio engine control apparatus

A control device, compression ratio technology, applied in engine control, machine/engine, electrical control, etc., can solve problems such as unstable combustion, reducing effective compression ratio ignition, etc.

Inactive Publication Date: 2012-10-17
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the compression ratio of the internal combustion engine in the fuel-cut operation state is excessively reduced as described above, for example, when the engine speed is low, there is a possibility that when the engine is restarted next time, the effective compression ratio may not be well maintained. Ignite and burn, resulting in unstable combustion

Method used

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  • Variable compression ratio engine control apparatus

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Embodiment Construction

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. refer to figure 1 , the engine is roughly composed of a cylinder head 1 and a cylinder block 2, and the engine is a spark ignition engine such as a gasoline engine with an ignition spark plug 9 for the combustion chamber 4 divided above the piston 3 The gas mixture inside is spark-ignited. As we all know, the engine includes: intake valve 5, which is driven by intake cam 12 to open and close intake port 7; exhaust valve 6, which is driven by exhaust cam 13 to open and close exhaust port 8; a fuel injection valve 10 as a fuel injection device for injecting and supplying fuel to the intake port 7; a throttle valve 15 for opening and closing the upstream side of the intake collector 14 to adjust the amount of intake air; and, the engine includes A variable compression ratio device 20 capable of changing the compression ratio of an internal combustion engine. Th...

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PUM

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Abstract

A variable compression ratio engine control apparatus during a fuel cut operating state in which fuel injection by the fuel injection section is stopped ensures the burning stability when the engine is restarted after the fuel is stopped, and restrains the target compression ratio to be a lower value based on the engine rotational speed, to thereby restrain the compression pressure and improve the fuel consumption performance. The variable compression ratio engine control apparatus includes a variable compression ratio device (20) capable of changing the variable compression ratio of an engine control apparatus, a fuel injection valve (10) injecting fuel into an engine for combustion, and a compression ratio controlling section (11) which sets a target compression ratio according a vehicle running state, controls the engine compression ratio toward the target compression ratio, and sets the target compression ratio based on an engine rotational speed, during a fuel cut operating state in which fuel injection by the fuel injection section is stopped.

Description

technical field [0001] The invention relates to a control device of a variable compression ratio engine capable of changing the compression ratio of an internal combustion engine. Background technique [0002] As a variable compression ratio engine capable of changing the compression ratio of an internal combustion engine, an engine having a variable compression ratio device using a multi-link piston-crank mechanism is known, as described in Patent Document 1, for example. In this engine, fuel cut control is performed to stop fuel injection when the engine is in a deceleration state, and in order to avoid engine stop at the next engine restart after fuel cut and ensure startup stability, when fuel cut When the engine speed is reduced to a recovery speed, fuel injection is started again. In addition, since the engine torque differs due to the difference in the compression ratio of the internal combustion engine, the starting stability at the next restart of the engine also v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D15/02
CPCF02D2200/101F02D15/00F02D41/065F02D15/02F02D41/123
Inventor 釜田忍
Owner NISSAN MOTOR CO LTD
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