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Secondary air system monitoring method and device, equipment and storage medium

A technology of secondary air and reference value, applied in the direction of exhaust device, electronic control of exhaust gas treatment device, diagnosis device of exhaust gas treatment device, etc.

Active Publication Date: 2021-07-30
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The linear oxygen sensor signal must be used for diagnosis, therefore, the linear oxygen sensor does not have the ability to monitor the low secondary air flow fault during the engine cold start phase and before the linear oxygen sensor works normally; and the linear oxygen sensor is used for the secondary air system During fault monitoring, it is necessary to calibrate the pressure difference / secondary air flow model in the engine control unit, which consumes a lot of work

Method used

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  • Secondary air system monitoring method and device, equipment and storage medium
  • Secondary air system monitoring method and device, equipment and storage medium
  • Secondary air system monitoring method and device, equipment and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Figure 1B It is a flow chart of a secondary air system monitoring method provided in Embodiment 1 of the present application. This embodiment is applicable to secondary air system fault monitoring, and the method can be performed by a secondary air system monitoring device. The device is realized by software and / or hardware, and can be integrated in the vehicle-mounted automatic diagnosis system.

[0033] Such as Figure 1B The method shown, the method may specifically include:

[0034] S110. After the program is initialized, obtain the first flow difference reference value when the secondary air pump is in the off state and the second flow difference reference value when the secondary air pump is in the open state; and obtain the stability auxiliary calculation value of the operating parameters , and acquire the first auxiliary calculation value when the secondary air pump is off and the second auxiliary calculation value when the secondary air pump is on.

[0035]...

Embodiment 2

[0059] figure 2 It is a flow chart of a secondary air system monitoring method provided in Embodiment 2 of the present application; on the basis of the above embodiment, for "determining whether the stability auxiliary calculation value meets the preset stability conditions, and determining the first Whether the auxiliary calculated value and the second auxiliary calculated value satisfy the validity condition" will be elaborated, such as figure 2 The method shown, the method may specifically include:

[0060] S210. After the program is initialized, obtain the first flow difference reference value when the secondary air pump is in the off state and the second flow difference reference value when the secondary air pump is in the open state; and obtain the stability auxiliary calculation value of the operating parameters , and acquire the first auxiliary calculation value when the secondary air pump is off and the second auxiliary calculation value when the secondary air pump...

Embodiment 3

[0071] image 3 It is a flowchart of a secondary air system monitoring method provided in Example 3 of the present application; on the basis of the above examples, an optional implementation is provided, such as image 3 As shown, the method may specifically include:

[0072] S310, program initialization.

[0073] Specifically, the flow difference reference value is initialized to 0; the engine speed low-pass filter value is initialized to the current actual speed value; the throttle opening low-pass filter value is initialized to the current actual throttle valve opening; each VVT angle is low The pass filter value is initialized to the current actual VVT angle value; the engine temperature low-pass filter value is initialized to the current actual engine temperature value.

[0074] S320. Acquire a flow difference reference value, acquire an auxiliary calculation value of stability of an operating parameter, and acquire a first auxiliary calculation value and a second auxil...

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Abstract

The invention discloses a secondary air system monitoring method and device, equipment and a storage medium. According to the method, after a program is initialized, a first flow difference reference value when a secondary air pump is in a closed state and a second flow difference reference value when the secondary air pump is in an open state are acquired; a stability auxiliary calculation value of an operation parameter is acquired, and a first auxiliary calculation value when the secondary air pump is in a closed state and a second auxiliary calculation value when the secondary air pump is in an open state are acquired; whether the stability auxiliary calculation value meets a preset stability condition or not is determined, and whether the first auxiliary calculation value and the second auxiliary calculation value meet a validity condition or not is determined; and if the preset stability condition and the validity condition are met, whether a secondary air system breaks down or not is determined according to the first flow difference reference value and the second flow difference reference value. According to the technical method, a new idea is provided for fault monitoring of the secondary air system.

Description

technical field [0001] The embodiments of the present application relate to automatic control technology, and in particular to a secondary air system monitoring method, device, equipment and storage medium. Background technique [0002] The secondary air system is a practical technology for exhaust emission control. In the cold start stage of the engine, before the three-way catalytic converter has reached its operating temperature, the expected catalytic conversion effect cannot be achieved, resulting in a large amount of hydrocarbons (hydrocarbon compounds, HC), carbon monoxide (carbon monoxide, CO) emissions, At this time, fresh air is actively injected into the exhaust pipe through the secondary air system, which can further oxidize and burn this part of HC and CO, and accelerate the temperature rise of the three-way catalytic converter while reducing emissions, thereby achieving the goal of reducing cold start emissions. Purpose. For vehicles equipped with a secondary...

Claims

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Application Information

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IPC IPC(8): F01N11/00F01N3/32
CPCF01N11/00F01N3/32Y02T10/40
Inventor 宋同好时宪孙鹏远孙超刘廷伟欣白宇张波
Owner CHINA FIRST AUTOMOBILE