CN-121676117-B - Cooperative activation method and system for coupling electric heating catalyst and plasma

CN121676117BCN 121676117 BCN121676117 BCN 121676117BCN-121676117-B

Abstract

The invention provides a cooperative activation method and a cooperative activation system for coupling an electric heating catalyst and plasma, wherein the method comprises the steps of arranging an exhaust pipe temperature sensor T1 and an EHC shell adherence sensor T2, judging whether the T1 and the T2 meet a first preset condition, if so, starting the EHC through a first energy regulating mode, judging whether the T2 meets a second preset condition, if so, discharging through an NTP (negative temperature coefficient) according to a first rated parameter to reach a first rated temperature, judging whether the T1 and the T2 meet a third preset condition, if so, starting through a second energy regulating mode, discharging through the NTP according to a second rated parameter to reach a second rated temperature, starting through the NTP according to a third rated parameter by the EHC through a third energy regulating mode, and when the T2 reaches the third rated temperature, reducing the EHC power and adjusting the NTP discharging frequency to reach a fourth rated temperature by the T1 and the T2. The invention can improve the low-temperature conversion efficiency of unburned HC, CO and NOx.

Inventors

LOU DIMING
ZHANG YUNHUA
DENG YONGHONG
SHI XIUYONG

Assignees

南昌智能新能源汽车研究院

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (5)

1. A method for the synergistic activation of an electrically heated catalyst coupled to a plasma, comprising the steps of: An exhaust pipe temperature sensor and an EHC housing adherence sensor are arranged; When the engine is started, judging whether collected data of the exhaust pipe temperature sensor and the EHC shell adherence sensor meet a first preset condition, if yes, starting a plurality of sections of controllable resistance wires in the EHC in a first energy adjusting mode so as to enable a heating gradient to be smaller than a rated heating gradient; Judging whether the acquired data of the EHC shell adherence sensor meets a second preset condition, if so, discharging with a first rated parameter through an NTP power supply until the acquired data of the EHC shell adherence sensor reaches a first rated temperature; judging whether the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor meet a third preset condition, if yes, starting a multi-section controllable resistance wire in the EHC in a second energy regulating mode, and discharging in a second rated parameter through an NTP power supply until the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor reach a second rated temperature; The multi-section controllable resistance wire inside the EHC is started in a third energy adjusting mode, and simultaneously discharges with a third rated parameter through an NTP power supply, when the acquired data of the EHC shell adherence sensor reaches a third rated temperature, the EHC power is reduced, the NTP discharge frequency is adjusted until the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor reach a fourth rated temperature; The inside of the EHC is sequentially provided with a first partition, a second partition and a third partition from an inlet side to an outlet side; the third preset condition is that the change rate of the collection temperature of the exhaust pipe temperature sensor and the change rate of the collection temperature of the EHC shell adherence sensor are both smaller than 3 ℃ per second, the temperature difference between the collection temperature of the exhaust pipe temperature sensor and the collection temperature of the EHC shell adherence sensor is smaller than 5 ℃, the second energy adjusting mode is that the first partition is continuously electrified at 45% -55% of rated power, the second partition enters 20% -25% of pulse heating state, the third partition is heated in a compensating mode at 10% -15% of rated power, the second rated parameter is that the voltage value is 8 kV-10 kV, the pulse power is 500-800 Hz, the discharge current is 3 mA-5 mA, the second rated temperature is that the collection data of the exhaust pipe temperature sensor is larger than 40 ℃ and the collection data of the EHC shell adherence sensor is 50% -60 ℃; The third energy adjusting mode is that the first partition is continuously electrified at 35% -40% of rated power, the second partition enters a pulse heating state of 25% -30%, the third partition is heated at 10% -15% of rated power, the third rated parameter is that the voltage value is 12 kV-14 kV, the pulse power is1 kHz-1.5 kHz, the third rated temperature is 95 ℃, the fourth rated temperature is that data collected by the exhaust pipe temperature sensor is greater than or equal to 80 ℃, and data collected by the EHC shell adherence sensor is greater than or equal to 100 ℃.
2. The method of claim 1, wherein the first preset condition is that the collection temperature of the exhaust pipe temperature sensor is less than or equal to 0 ℃ and the difference between the collection temperature of the exhaust pipe temperature sensor and the collection temperature of the EHC housing wall sensor is less than 2 ℃.
3. The method for collaborative activation of an electrically heated catalyst and plasma coupling according to claim 1, wherein the first energy modulation mode is that the first zone is energized for 3 s-5 s at 10% -15% of rated power, the second zone is maintained in a power-off state, the third zone is pulsed at 5% -8% of rated power, and the rated temperature gradient is 2 ℃.
4. The method for collaborative activation of an electrically heated catalyst and plasma coupling according to claim 1, wherein the second preset condition is that the acquisition temperature of the EHC housing wall-mounted sensor is less than or equal to-10 ℃, the first rated parameter is that the voltage value is 6 kv-8 kv, the pulse power is 200 hz-400 hz, and the first rated temperature is 5 ℃.
5. A co-activation system for coupling an electrically heated catalyst to a plasma, comprising: the arrangement module is used for arranging an exhaust pipe temperature sensor and an EHC shell adherence sensor; the starting module is used for judging whether the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor meet a first preset condition or not when the engine is started, and if yes, starting a plurality of sections of controllable resistance wires in the EHC in a first energy-regulating mode so as to enable the temperature-rising gradient to be smaller than the rated temperature-rising gradient; The first control module is used for judging whether the acquired data of the EHC shell adherence sensor meets a second preset condition or not, if yes, discharging with a first rated parameter through an NTP power supply until the acquired data of the EHC shell adherence sensor reaches a first rated temperature; The second control module judges whether the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor meet a third preset condition, if yes, a plurality of sections of controllable resistance wires in the EHC are started in a second energy adjusting mode, and meanwhile, discharge is carried out through an NTP power supply in a second rated parameter until the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor reach a second rated temperature; the third preset condition is that the change rate of the collection temperature of the exhaust pipe temperature sensor and the change rate of the collection temperature of the EHC shell adherence sensor are both smaller than 3 ℃ per second, the temperature difference between the collection temperature of the exhaust pipe temperature sensor and the collection temperature of the EHC shell adherence sensor is smaller than 5 ℃, the second energy adjusting mode is that the first partition is continuously electrified at 45% -55% of rated power, the second partition enters 20% -25% of pulse heating state, the third partition is heated in a compensating mode at 10% -15% of rated power, the second rated parameter is that the voltage value is 8 kV-10 kV, the pulse power is 500-800 Hz, the discharge current is 3 mA-5 mA, the second rated temperature is that the collection data of the exhaust pipe temperature sensor is larger than 40 ℃ and the collection data of the EHC shell adherence sensor is 50% -60 ℃; The system comprises a first control module, a second control module, a third control module and an EHC shell adherence sensor, wherein the first control module is used for starting a multi-section controllable resistance wire in the EHC through a third energy regulating mode, discharging is carried out through an NTP power supply at a third rated parameter, when the acquired data of the EHC shell adherence sensor reach a third rated temperature, the EHC power is reduced, the NTP discharging frequency is regulated until the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor reach a fourth rated temperature, the third energy regulating mode is used for continuously electrifying the first partition at 35% -40% of rated power, the second partition enters a 25% -30% pulse heating state, the third partition is heated at 10% -15% of rated power, the third rated parameter is that the voltage value is 12-14 kV, the pulse power is 1 kHz-1.5, the third rated temperature is 95 ℃, the acquired data of the exhaust pipe temperature sensor is 80 ℃ or more, and the data of the EHC shell adherence sensor is 100 ℃ or more.

Description

Cooperative activation method and system for coupling electric heating catalyst and plasma Technical Field The invention relates to the technical field of internal combustion engine aftertreatment, in particular to a cooperative activation method and system for coupling an electric heating catalyst and plasma. Background In the technical field of internal combustion engine aftertreatment, an Electric Heating Catalyst (EHC) is used as an active preheating technology, so that the problem that the catalytic efficiency of a traditional three-way catalyst (TWC) is extremely low due to over-low temperature in the cold start stage of an engine can be effectively solved, and the emission of harmful pollutants in the stage is reduced. However, in order to rapidly raise the temperature of the carrier, the conventional EHC technology often applies high-power heating at the initial stage of starting, and this severe temperature raising process easily causes thermal shock to the resistance wire and the ceramic carrier inside the catalyst, which affects the long-term reliability thereof, and has high energy consumption. Meanwhile, low temperature plasma (NTP) technology has been studied for assisting exhaust gas purification and catalyst low temperature activation because it can generate high active particles by electric discharge at normal temperature and pressure. However, when the NTP technology is independently applied to treat high-flow and low-temperature exhaust gas generated during cold start of an engine, the challenges of low energy utilization rate and limited activation effect often exist. In the prior art, simple combinations of EHCs and NTPs often fail to adequately account for synergistic matching and sequential control of both under cold start extreme conditions. For example, direct start-up in very low temperature environments may result in damage to the EHC due to excessive temperature differentials, or inefficiency of the NTP discharge due to temperature mismatch. Lacks a cooperative control method for intelligently adjusting the EHC partition heating strategy and the NTP discharge parameters according to the real-time temperature state so as to realize a gentle, efficient and reliable catalyst activation process, and optimize the energy consumption and the purification effect while protecting the service life of the device. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a cooperative activation method for coupling an electric heating catalyst and plasma, which aims to solve the technical problems in the background art. In order to achieve the above object, the present invention is achieved by the following technical scheme: A method of co-activation of an electrically heated catalyst coupled to a plasma, comprising the steps of: An exhaust pipe temperature sensor and an EHC housing adherence sensor are arranged; When the engine is started, judging whether collected data of the exhaust pipe temperature sensor and the EHC shell adherence sensor meet a first preset condition, if yes, starting a plurality of sections of controllable resistance wires in the EHC in a first energy adjusting mode so as to enable a heating gradient to be smaller than a rated heating gradient; Judging whether the acquired data of the EHC shell adherence sensor meets a second preset condition, if so, discharging with a first rated parameter through an NTP power supply until the acquired data of the EHC shell adherence sensor reaches a first rated temperature; judging whether the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor meet a third preset condition, if yes, starting a multi-section controllable resistance wire in the EHC in a second energy regulating mode, and discharging in a second rated parameter through an NTP power supply until the acquired data of the exhaust pipe temperature sensor and the EHC shell adherence sensor reach a second rated temperature; And when the collected data of the EHC shell adherence sensor reaches a third rated temperature, reducing the EHC power and adjusting the NTP discharge frequency until the collected data of the exhaust pipe temperature sensor and the EHC shell adherence sensor reach a fourth rated temperature. According to one aspect of the above technical solution, the first preset condition is that the collection temperature of the exhaust pipe temperature sensor is less than or equal to 0 ℃, and the difference between the collection temperature of the exhaust pipe temperature sensor and the collection temperature of the EHC housing wall sensor is less than 2 ℃. According to an aspect of the above technical solution, the EHC is internally provided with a first partition, a second partition, and a third partition in order from an inlet side to an outlet side. According to the technical scheme, the first energy adjusting mode is that the first partition is electrified for 3 s-5 s at 10% -15% of rated