EGR (exhaust gas recirculation) system pipeline state detection method, device and vehicle with device

A state detection, EGR valve technology, applied in the charging system, adding non-fuel substances to fuel, exhaust gas recirculation, etc., can solve the problems of decreased measurement accuracy, inability to use machines, poor versatility, etc., to ensure detection accuracy, control Design cost and manufacturing cost, the effect of good versatility

Active Publication Date: 2014-04-30
WEICHAI POWER CO LTD
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Problems solved by technology

[0005] The existing detection method of the pipeline state based on the intake flow depends on the intake flow sensor, which cannot be applied to machines without an intake flow sensor; at the same time, the intake flow sensor has poor anti-pollution ability, and it is directly polluted by dust and water vapor. Affects the decrease of measurement accuracy; when the size and shape of the pipeline change, the characteristic curve of the sensor must be re-calibrated, and the versatility is poor

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  • EGR (exhaust gas recirculation) system pipeline state detection method, device and vehicle with device
  • EGR (exhaust gas recirculation) system pipeline state detection method, device and vehicle with device
  • EGR (exhaust gas recirculation) system pipeline state detection method, device and vehicle with device

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Embodiment Construction

[0040] The core of the present invention is to provide an engine EGR system pipeline state detection method, which mainly superimposes the detection fluctuation signal and the conventional EGR valve output signal to obtain the pressure change after the valve, which is used as the EGR system pipeline The basis of road status. The accompanying drawings in the following description provide a further detailed description of the technical solution provided by the present invention.

[0041] Without loss of generality, this embodiment is based on the OBD implementation of the engine, OBD (On-Board Diagnostics), also known as the on-board automatic diagnostic system, monitors whether the car's exhaust exceeds the limit at any time from the engine's operating status. Once the limit is exceeded, an alert will be issued immediately. When the system fails, the fault (MIL) light or the Check Engine (Check Engine) warning light is on, and the powertrain control module (PCM) stores the fault i...

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Abstract

The invention discloses an EGR (exhaust gas recirculation) system pipeline state detection method which includes the steps: pre-calibrating an EGR downstream pressure amplitude MAP based on engine speed and fuel injection quantity; superposing a fluctuation detection signal to an EGR valve output signal to adjust the opening of an EGR valve; searching the EGR downstream pressure amplitude MAP according to the current engine speed and the fuel injection quantity to obtain an EGR downstream pressure amplitude threshold value based on the fluctuation detection signal; acquiring the current EGR downstream pressure amplitude and comparing the current EGR downstream pressure amplitude with the EGR downstream pressure amplitude threshold value to determine the pipeline state of a system. The EGR system pipeline state detection method can effectively reduce the influence of dust and water vapor on detection precision, and is reliably applicable to different models. On the basis, the invention further provides an EGR system pipeline state detection device and a vehicle with the same.

Description

Technical field [0001] The invention relates to the technical field of diesel engines, in particular to a method and device for detecting the pipeline state of an EGR system and a vehicle with the device. Background technique [0002] With the continuous improvement of national standards for engine emission requirements, the restrictions on the emissions of particulate matter PM and nitrogen oxides NOx in engine exhaust gas have become increasingly strict. [0003] In order to obtain good NOx emission performance, EGR (Exhaust Gas Recirculation) technology is widely used in diesel engines. This technology delays the combustion process by returning part of the exhaust gas generated by the diesel engine to the cylinder, thereby reducing NOx content in exhaust gas. At the same time, OBD (On-Board Diagnostics, On-Board Diagnostics) will monitor whether the car’s exhaust exceeds the limit at any time from the engine’s operating conditions. Once the limit is exceeded, it will immediatel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02M25/07F02M26/49
Inventor 仲昆代子阳龚英利姚旺栾军山
Owner WEICHAI POWER CO LTD
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