Control device and method of spark-ignition gasoline engine

A gasoline engine, spark ignition technology, applied in the direction of electric spark ignition controller, engine control, ignition controller, etc., can solve the problem that the pump loss cannot be improved

Inactive Publication Date: 2012-08-29
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, from the standpoint of combustion stability, the amount of external EGR gas that can be introduced into the cylinder is limited to a relatively small amount
Therefore, when the engine load is high and the amount of fuel and fresh air is relatively large, although it is not necessary to reduce the amount of intake air by introducing external EGR gas, when the engine load is in the load

Method used

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  • Control device and method of spark-ignition gasoline engine
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  • Control device and method of spark-ignition gasoline engine

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Embodiment Construction

[0069] Hereinafter, an embodiment of a control device for a spark ignition type gasoline engine will be described based on the drawings. The description of the following specific embodiments is an example. figure 1 , 2The schematic structure of the engine (engine main body) 1 is shown. The engine 1 is a spark ignition type gasoline engine mounted on a vehicle and supplied with fuel containing at least gasoline. The engine 1 has a cylinder block 11 provided with a plurality of cylinders 18 (only one is shown), a cylinder head 12 provided on the cylinder block 11 , and an oil pan 13 provided below the cylinder block 11 and storing lubricating oil. A piston 14 connected to the crankshaft 15 via a connecting rod 142 is reciprocally inserted in each cylinder 18 . like image 3 The enlargement in , shows that a bowl-shaped cavity 141 is formed on the top surface of the piston 14 . The cavity 141 faces a direct injection injector 67 described later when the piston 14 is located ...

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Abstract

A control device and method of a spark-ignition gasoline engine is provided. An engine operates in a compression ignition model in a low load area and in a spark ignition model in a high load area. In the spark ignition model, within a retard period from a late stage of a compression stroke to an early stage of an expansion stroke, an external EGR is executed for control. In a switching area with comparatively lower load in an execution area in the spark ignition model, an EGR rate controlled by the external EGR is set higher than a load of the switching area and filling quantity control for making an intake filling quantity lower than an intake filling quantity of the compression ignition model. Accordingly, combustion stability in the spark ignition model can be raised and the load area for reducing intake filling quantity can be reduced as much as possible.

Description

technical field [0001] The present invention relates to techniques for controlling spark ignition gasoline engines. Background technique [0002] An HCCI (Homogeneous Compression Ignition) engine that compression-ignites a lean air-fuel mixture disclosed in Japanese Patent Laid-Open Publication No. 2009-91994 is known as a technique for both improving exhaust emissions and improving thermal efficiency. However, as the engine load becomes higher, the compression ignition combustion becomes a premature ignition combustion with a sharp pressure rise. This leads to an increase in combustion noise, abnormal combustion such as knocking, and an increase in raw NOx due to high combustion temperature. For this reason, in such an HCCI engine, compression ignition combustion is limited only to the low-load operating range, and spark ignition combustion by spark plug operation is generally performed in the high-load operating range. [0003] Furthermore, the engine operates at an air-...

Claims

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Application Information

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IPC IPC(8): F02D41/30F02D21/08F02D43/00F02P9/00
CPCF02B1/12F02B23/101F02B29/0418F02B29/0437F02D13/0234F02D13/0242F02D13/0273F02D41/0057F02D41/3836F02M35/10177F02M35/1038F02M35/10386F02M26/25F02M26/28F02M26/01F02M26/47F02D41/3041Y02T10/12Y02T10/40
Inventor 长津和弘山川正尚岩井浩平乃生芳尚太田统之渡边一丰渡边直哉栗田宽之大场秀儿古闲达也
Owner MAZDA MOTOR CORP
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