Control devices for internal combustion engines

A technology for control devices and internal combustion engines, which is applied in engine control, electrical control, exhaust devices, etc., and can solve problems such as decreased detection accuracy and difficult particulate filter fault diagnosis

Active Publication Date: 2016-01-20
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem in the prior art that the detection accuracy is lowered due to the characteristic variation of the PM sensor, and it is difficult to stably diagnose the fault of the particulate filter.

Method used

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  • Control devices for internal combustion engines
  • Control devices for internal combustion engines
  • Control devices for internal combustion engines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0048] Structure of Embodiment 1

[0049] Below, refer to figure 1 and Figure 6 Embodiment 1 of the present invention will be described. figure 1It is an overall configuration diagram for explaining the system configuration of Embodiment 1 of the present invention. The system of the present embodiment has an engine 10 as an internal combustion engine, and a particulate filter 14 for trapping PM in exhaust gas is provided in an exhaust passage 12 of the engine 10 . The particulate filter 14 is constituted by a known filter including, for example, a DPF (Diesel Particulate Filter, Diesel Particulate Filter). In addition, a resistive PM sensor 16 for detecting the amount of PM in the exhaust gas is provided on the downstream side of the particulate filter 14 in the exhaust passage 12 . The PM sensor 16 is connected to an ECU (Electronic Control Unit, electronic control unit) 18 that controls the operating state of the engine 10 . The ECU 18 is composed of an arithmetic proc...

Embodiment approach 2

[0072] Next, refer to Figure 7 ~ Figure 9 Embodiment 2 of the present invention will be described. The present embodiment is characterized in that zero-point abnormality determination control is executed in the same configuration and control as in the first embodiment described above. In addition, in this embodiment, the same reference numerals as in Embodiment 1 are assigned to the same components as in Embodiment 1, and description thereof will be omitted.

[0073] Features of Embodiment 2

[0074] In the present embodiment, the zero-point abnormality determination control is executed using the zero-point output Ve acquired by the zero-point correction control. In this control, it is determined that the PM sensor 16 has failed when the zero output Ve is outside a predetermined range (hereinafter referred to as a zero allowable range). The zero allowable range is set in advance according to design specifications of the sensor and detection circuit, and the like. Figure 7 I...

Embodiment approach 3

[0085] Next, refer to Figure 10 ~ Figure 12 Embodiment 3 of the present invention will be described. The present embodiment is characterized in that, in addition to the same configuration and control as in the first embodiment described above, sensitivity correction control is executed. In addition, in this embodiment, the same reference numerals as in Embodiment 1 are assigned to the same components as in Embodiment 1, and description thereof will be omitted.

[0086] Features of Embodiment 3

[0087] In the present embodiment, sensitivity correction control for correcting variations in sensor output sensitivity is executed by PM combustion control. Figure 10 It is an explanatory diagram for explaining the content of the sensitivity correction control in Embodiment 3 of the present invention. As shown in the figure, when the PM sensor is operating, the amount of captured PM increases with the passage of time, and the sensor output also increases accordingly. Then, when ...

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PUM

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Abstract

An object of the present invention is to appropriately correct the variation in the characteristics of the PM sensor and improve the detection accuracy of the sensor. The PM sensor (16) has a pair of electrodes (22) for trapping PM in the exhaust gas, and the sensor output changes according to the amount of PM trapped. When the sensor output is close to a saturated state, the PM combustion control is executed in which the heater (26) burns PM between the electrodes (22) and removes it. When correcting the zero point output of the PM sensor ( 16 ), first, the sensor output at the time when the predetermined time required for the combustion of PM has elapsed after the start of energization to the heater ( 26 ) by the PM combustion control is obtained as the zero point output Ve. Then, based on the acquired zero-point output Ve and the reference value V0 of the zero-point output previously stored in the ECU ( 18 ), the sensor output at any time is corrected. Thereby, the zero point correction of the sensor can be smoothly performed using the existing PM combustion control.

Description

technical field [0001] The invention relates to a control device of an internal combustion engine having a PM sensor for detecting, for example, the amount of particulate matter (PM=Particulate Matter) contained in the exhaust gas. Background technique [0002] As prior art, a control device for an internal combustion engine having a resistive PM sensor is known, for example, as disclosed in Patent Document 1 (JP-A-2009-144577). A conventional PM sensor has a structure including a pair of electrodes provided on an insulator, and when PM in exhaust gas is collected between these electrodes, the resistance value between the electrodes changes according to the collected amount. Thus, conventionally, the amount of PM in the exhaust gas is detected based on the resistance value between the electrodes. Also, conventionally, a PM sensor is disposed downstream of a particulate filter that traps PM in exhaust gas, and a particulate filter failure diagnosis is performed based on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00F01N3/02
CPCF02D41/1466F02D41/1494F02D41/2441F02D41/2474F01N11/00
Inventor 青木圭一郎
Owner TOYOTA JIDOSHA KK
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