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Exhaust-recirculation controlling device

A technology for exhaust gas recirculation and control devices, which is applied in the direction of exhaust gas recirculation, exhaust devices, valve devices, etc., and can solve problems such as burnout, motor failure, and increased motor drive current for driving the shaft

Inactive Publication Date: 2004-06-30
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, the drive current of the motor driving the shaft is increased, causing the motor to malfunction or burn out

Method used

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  • Exhaust-recirculation controlling device
  • Exhaust-recirculation controlling device
  • Exhaust-recirculation controlling device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0024] see figure 1 , the exhaust gas recirculation control device according to the first embodiment of the present invention will be described.

[0025] Such as figure 1 As shown, an exhaust gas recirculation control device 1 includes a valve casing 10 with a gas channel 10a formed inside, a butterfly valve 20, a speed reduction device 30, a return spring 40 as a pushing element, and a valve shaft opening sensor 50 , a driving motor 60, and a control device 70. The exhaust gas recirculation control device 1 utilizes the opening and closing movement of the butterfly valve 20 to recirculate the exhaust gas discharged from the combustion chamber of the internal combustion engine into the intake pipe through the gas passage 10a. The driving motor 60 controls the rotational driving of the butterfly valve 20 .

[0026] The butterfly valve 20 is placed in a gas passage 10 a formed in the valve housing 10 . The butterfly valve 20 adjusts the flow rate of the exhaust gas flowing d...

no. 2 example

[0047] The EGR control device of the second embodiment will be described below with reference to FIG. 3 .

[0048] In the second embodiment, an intersection 15 is formed at the junction between the first inner surface 14a1 of the sediment return tank 14a on one side of the gas passage 10a and the inner surface 12a of the cavity 12, as shown in FIG. 3 . At the intersection portion 15, the first inner surface 14a1 of the sediment return tank 14a and the inner surface 12a of the containing hole 12 form an acute angle.

[0049] Therefore, even if particulate matter or the like enters the gap between the valve shaft 21 and the receiving hole 12 and settles on the first inner surface 14a1 of the sediment return groove 14a and the second inner surface 14a2 of the bearing end, the fastening on the valve shaft 21 The rotational force required for deposits on the inner surface 14a1 is also reduced. Therefore, by driving and controlling the drive motor 60 to rotate the valve shaft 21 ,...

no. 3 example

[0051] In the EGR control system according to the third embodiment of the present invention, an intersection is formed at the junction between the second inner surface 14a2 of the sediment return tank 14a on the side of the bearing 11 and the inner surface 12a of the receiving hole 12 16, such as Figure 4 shown. At the intersection portion 16, the second inner surface 14a2 of the sediment return groove 14a at the end of the bearing 11 and the inner surface 12a of the containing hole 12 form an acute angle.

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PUM

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Abstract

An exhaust gas recirculation control device (1) has a valve housing (10) formed with a gas passage (10a) inside, a butterfly valve (20) capable of opening and closing the gas passage (10a) and a driving motor (60) for driving a valve shaft (21) of the butterfly valve (20) to rotate. A valve member (22) of the butterfly valve (20) and a bearing (11) of the valve housing (10) are disposed on the valve shaft (21) in a line in a longitudinal direction of the valve shaft (21). An accommodation hole (12) for accommodating the valve shaft (21) is formed between the gas passage (10a), which accommodates the valve member (22), and the bearing (11). A communication hole (14) opening into the accommodation hole (12) and the gas passage (10a) downstream of the butterfly valve (20) is provided. Thus, sticking or poor operation of the valve shaft (21) and the bearing (11) caused by deposits can be inhibited.

Description

technical field [0001] The invention relates to an exhaust gas recirculation control device, in particular to an exhaust gas recirculation control valve for recirculating exhaust gas into an intake pipe. Background technique [0002] An exhaust gas recirculation control device is known which lowers the maximum combustion temperature by mixing (recirculating) part of the exhaust gas of an internal combustion engine into the intake air to reduce toxic substances such as sulfur dioxide in the exhaust gas, for example, as in PCT International Application Publication WO 01 / 07808 (Patent Document 1) and Japanese Patent Publication No. H10-103166 (Patent Document 2). [0003] Patent Document 1 discloses a butterfly valve structure of an exhaust gas recirculation control device for controlling the flow of exhaust gas. The valve structure described in Patent Document 1 has a valve pipe that guides exhaust gas, and a butterfly valve placed in the valve pipe. Butterfly valves are ro...

Claims

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Application Information

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IPC IPC(8): F02D9/10F02M25/07F16K1/22F16K27/02F16K31/04F16K51/00
CPCF02D9/1065F02M25/0701F16K27/029F02M25/0795F02D9/1055F02M25/0756Y02T10/121F02M25/0793F16K27/0218F02M25/0797F02D9/1085F02M25/0773F02M26/48F02M26/50F02M26/54F02M26/70F02M26/73F02M26/74
Inventor 难波邦夫桥本考司佐佐木一司
Owner DENSO CORP
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