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Egr effective flow diagnosis method

A technology of effective flow and diagnosis method, applied in the direction of diagnosis device, electrical control, charging system of exhaust gas treatment device, etc., can solve problems such as unreasonable

Pending Publication Date: 2021-06-04
HYUNDAI MOTOR CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, this approach is not justified in practice due to the determination of what is not present even when EGR effective flow is present, or vice versa
This is because there is a large error between the effective flow calculated by the MAP sensor and the effective flow calculated by the MAF sensor

Method used

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Embodiment Construction

[0040]For a full understanding of the present disclosure, its operational advantages, and objects achieved by the practice of the present disclosure, reference should be made to the accompanying drawings, which illustrate various embodiments of the present disclosure, and the contents described in the accompanying drawings.

[0041] In the description of the embodiments of the present disclosure, well-known technologies or repetitive descriptions that may unnecessarily obscure the subject matter of the present disclosure are reduced or omitted.

[0042] figure 2 is a diagram showing an exhaust gas recirculation (EGR) system to which the present disclosure is applied. image 3 is shown in figure 2 A diagram of the state in which the EGR valve in the system has been blocked is shown in . Figure 4 is shown in figure 2 A diagram of the state in which the EGR valve has been opened is shown in the system.

[0043] The EGR effective flow rate diagnosis method according to the...

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Abstract

The invention discloses an Exhaust Gas Recirculation (EGR) effective flow diagnosis method. The EGR effective flow diagnosis method includes: measuring an EGR gas temperature by an EGR gas temperature sensor under an EGR gas temperature rise condition of an EGR system on an intake line; determining the degree of the EGR gas temperature rise; and determining whether an EGR effective flow is excessive or insufficient according to the degree of the EGR gas temperature rise.

Description

technical field [0001] The present disclosure relates to a method of diagnosing the presence or absence of effective flow by turning exhaust gas recirculation (EGR) on and off. Background technique [0002] Recently, exhaust gas recirculation (EGR) has been developed and applied to improve fuel efficiency of vehicle engines. [0003] An EGR system refers to a method of reducing nitrogen oxides (NOx) in exhaust gases and refers to a device or system for recirculating a portion of the inert exhaust gases to the induction system. The EGR system mixes inert exhaust gas into the air mixture drawn into the engine to reduce the maximum temperature during combustion to produce less NOx. [0004] Furthermore, in order to secure operability, the EGR system senses intake air temperature, cooling temperature, vehicle speed, or shift position to control and recirculate a portion of exhaust gas to the suction pipe under the most appropriate control according to the operating state. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/47F02M26/49
CPCF02M26/47F02M26/49F02M26/06F02M26/48F02D41/0072F02D41/0055Y02T10/40F02D41/0077F01N11/005F02D41/0062
Inventor 金东瑄安多絮崔暎络
Owner HYUNDAI MOTOR CO LTD