System and method for monitoring flow of EGR (Exhaust Gas Recirculation) valve through air inlet temperature rise
An EGR valve and flow technology, applied in the direction of charging system, exhaust gas recirculation, machine/engine, etc., can solve the problems of complex system, high precision requirements, and large deviation of calculation results
Active Publication Date: 2022-01-07
DONGFENG COMML VEHICLE CO LTD
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[0003] The above-mentioned prior art has the following defects: due to the separate calculation of the intake air flow and the fresh air flow of the engine manifold, the accumulation of errors may lead to large deviations in the final calculation results
The system is relatively complex and requires high precision for each component
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[0036] The present invention is further detailed in conjunction with the accompanying drawings and specific examples. Next, the technical solutions in the embodiments of the present invention will be described in connection with the drawings of the embodiments of the present invention, and it is understood that the described embodiments are merely the embodiments of the present invention, not all of the embodiments.
[0037] In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "post", "left", "right", "top", "bottom", "inside", " The orientation or position of the instructions such as "is based on the orientation or positional relationship shown in the drawings, which is merely intended to describe the present invention and simplified description, rather than indicating or implying that the device or component must have a specific orientation. Specific orientation configurations and operations are not to be understood as lim...
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The invention discloses a system and method for monitoring the flow of an EGR (Exhaust Gas Recirculation) valve through air inlet temperature rise. The method comprises the following steps: (1) entering a stable working condition 1, collecting parameters of an engine and parameters of the EGR valve, periodically collecting a temperature parameter of an intake manifold of the engine under the stable working condition 1, and defining a final temperature value as T1 before the stable working condition 1 is switched to a stable working condition 2; (2) switching the stable working condition 1 to the stable working condition 2, periodically collecting the temperature parameter of the intake manifold of the engine under the stable working condition 2, and defining the temperature parameter as T2; (3) determining T3 according to the T1 and the T2, and comparing the T3 with a temperature set threshold value T0, wherein if the T3 is higher than the temperature set threshold value T0, the EGR valve flow is normal; and if the T3 is lower than the temperature set threshold value T0, the flow of the EGR valve is abnormal, and the flow of the EGR valve is low. According to the system and method, whether the flow of the EGR valve is normal or not is judged by monitoring the temperature rise change of the intake manifold of the engine meeting the diagnosis condition.
Description
Technical field [0001] The present invention belongs to the technical field of heavy duty diesel air systems, and in particular, a system and method for monitoring EGR valve flow through intake temperature rise. Background technique [0002] The method for monitoring the flow of EGR valve is: Calculate the total intake flow through the change of the engine intake manifold, calculate the fresh air flow through the intake village with the PFM sensor, and the two are reduced The exhaust gas flow brought by the EGR road monitors the actual calculation of exhaust gas flow. If the calculated amount deviation is greater than the license limit, the EGR valve flow abnormality fault is reported. [0003] The prior art described above has the following defects: due to the calculation of engine manifold air flow and fresh air flow, the accumulation of errors can result in a large deviation of the final calculation result. The system is more complicated, and it is high for each component accu...
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IPC IPC(8): F02M26/47F02M26/49
CPCF02M26/47F02M26/49
Inventor 李博张凯丽刘凯胡巍瀚王景智周子煦
Owner DONGFENG COMML VEHICLE CO LTD