dpf temperature control system and its control method
A technology of temperature control system and DPF, which is applied to the electronic control of exhaust treatment devices, machines/engines, mechanical equipment, etc., and can solve problems such as low efficiency, low hydrocarbon conversion efficiency, inaccurate hydrocarbon metering and injection, etc.
Active Publication Date: 2020-09-15
NANJING KEYI ENVIRONMENTAL PROTECTION SCI & TECH
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Problems solved by technology
[0007] Low hydrocarbon conversion efficiencies can be caused by "real" inefficiencies caused by problems in the heat generating unit and DPF (e.g. plugged DOC, sulfur poisoning, catalyst particle buildup in the DOC or DPF, etc.), or by problems with hydrocarbon metering injection "Show" inefficiencies (e.g. inaccurate hydrocarbon metering injection)
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[0048] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0049] Such as figure 1 As shown, an exhaust gas treatment system of the present invention includes an internal combustion engine 100 and a catalytic conversion device 160 located at the exhaust outlet of the exhaust manifold 101 of the internal combustion engine. An external hydrocarbon injection device, a first temperature sensor 163 , a first differential pressure sensor 164 , a second temperature sensor 167 , a third temperature sensor 169 , a second differential pressure sensor 168 and a controller 150 . Exhaust gas channel 166 , conical constriction 165 , DOC 161 and DPF 162 are arranged along the direction of exhaust gas outlet. Exhaust gas generated in internal combustion engine 100 enters exhaust gas channel 166 through exhaust manifold 101 , and the controller is ECU. The external hydrocarbon injection device is arranged on the exha...
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The invention discloses a DPF temperature control system and a control method. The DPF temperature control system and comprises a DOC target temperature calculation module, a change rate limiter, a feedforward controller, a PID controller, a PWM calculation module and a compensation module, wherein the DOC target temperature calculation module calculates to obtain a DOC target temperature DOCT-target, the change rate limiter calculates a DOC temperature command value, the PID controller calculates a PID control value, and the feedforward controller calculates a feedforward control value; and the PWM calculation module calculates according to a calculated value which is obtained by multiplying the PID control value by a mass flow rate value of tail gas, and then adding the product with thefeedforward control value, and a supply pressure value of a hydrocarbon to obtain a PWM instruction, and the compensation module calculates a PWM duty ratio according to the PWM instruction and a degradation factor value DF. The temperature control system adopted by a tail gas treatment system is capable of compensating the measurement errors of the DOC and the DPF temperature control system, andcorrecting the temperature control performance of the system.
Description
technical field [0001] The invention relates to a tail gas treatment system, in particular to a DPF temperature control system and a control method thereof. Background technique [0002] Exhaust gas discharged from the engine has been identified as the main cause of air pollution, and an exhaust gas treatment system can be used to remove air pollutants in the exhaust gas in the prior art. In exhaust treatment systems, diesel particulate filters (DPF) are commonly used to capture particulate matter (PM), which may include unburned hydrocarbon particles (soot) and small amounts of other particles such as metal oxide particles (ash) . Particulate matter accumulates in the DPF and requires a regeneration process to remove accumulated soot before the accumulation causes excessive back pressure in the engine. [0003] Usually during regeneration, a heat generating device is used to raise the temperature of the exhaust gas to a level where the soot can be effectively oxidized by ...
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IPC IPC(8): F01N3/025F01N11/00F01N13/00
CPCF01N3/025F01N11/002F01N13/00Y02T10/40
Inventor 齐宝华
Owner NANJING KEYI ENVIRONMENTAL PROTECTION SCI & TECH