DPF system and control method and device
A technology of DPF and controller, which is applied in the direction of exhaust device, muffler device, exhaust treatment device, etc., can solve the problems of inaccurate DPF differential pressure measurement, influence on carbon load estimation, and influence on processing safety, etc., to achieve The effect of reducing the risk of re-freezing, avoiding the impact of measurement accuracy, and avoiding energy waste
Active Publication Date: 2021-06-11
WEICHAI POWER CO LTD +1
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Problems solved by technology
[0003]However, when the engine is in an extremely low temperature environment, the moisture in the exhaust gas will freeze in the DPF differential pressure pipe, resulting in inaccurate measurement of the DPF differential pressure, and further Affects functions such as carbon load estimation
In severe cases, the DPF differential pressure pipe is blocked by freezing, and the measurement is completely invalid, which affects the safety of post-processing
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[0048] In order to make the above objects, features and advantages of the present application more obvious and understandable, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0049] In the research on DPF, the inventor found that when the engine is in an extremely cold environment, the moisture in the exhaust gas will freeze in the DPF differential pressure tube, resulting in inaccurate DPF differential pressure measurement, which in turn affects functions such as carbon load estimation. Normally, once the DPF differential pressure tube is severely frozen, the high-temperature exhaust gas discharged during normal driving cycles cannot melt the frozen ice in the DPF differential pressure tube.
[0050] Based on this, an embodiment of the present application provides a DPF system with a heating function, and the system includes a DPF, a DPF differential pressu...
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The embodiment of the invention discloses a DPF system and a control method and device. The system comprises a heating device, and the heating device is installed on a DPF differential pressure pipe. A DPF differential pressure pipe heating mode is adopted, frozen ice in the DPF differential pressure pipe is effectively melted, and the problem that the DPF differential pressure pipe is in an icing state for a long time when an engine is in an extremely cold environment is solved. Meanwhile, the heating function of the DPF differential pressure pipe can be controlled in real time, the risk that the DPF differential pressure pipe is frozen again after being unfrozen can be effectively reduced, the heating function is stopped when not necessary, and energy waste of a heating storage battery can be avoided. In addition, the DPF differential pressure pipe is heated so that the interior of a DPF differential pressure sensor can be effectively prevented from being frozen, and the measurement precision of the DPF differential pressure sensor is prevented from being affected.
Description
technical field [0001] The present application relates to the technical field of automobile post-processing, in particular to a DPF system, a control method and a device. Background technique [0002] At present, due to emission regulations, more and more diesel engines choose to use diesel particulate filter (Diesel Particulate Filter, DPF) to treat particulate pollutants in exhaust gas. Among them, the DPF differential pressure sensor plays an important role in the estimation of DPF carbon load and DPF diagnosis. [0003] However, when the engine is in an extremely low temperature environment, the moisture in the exhaust gas will freeze in the DPF differential pressure tube, resulting in inaccurate DPF differential pressure measurement, which in turn affects functions such as carbon load estimation. In severe cases, the DPF differential pressure pipe is blocked by freezing, and the measurement is completely invalid, which affects the safety of post-processing. Contents ...
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Login to View More IPC IPC(8): F01N3/02F01N9/00F01N11/00
CPCF01N3/02F01N9/002F01N9/00F01N11/002Y02T10/40
Inventor 李康褚国良王坤兰亚樊婷婷
Owner WEICHAI POWER CO LTD