CN114922721B - Tail gas heating control device and method for hybrid diesel engine - Google Patents
Tail gas heating control device and method for hybrid diesel engine Download PDFInfo
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- CN114922721B CN114922721B CN202210664401.1A CN202210664401A CN114922721B CN 114922721 B CN114922721 B CN 114922721B CN 202210664401 A CN202210664401 A CN 202210664401A CN 114922721 B CN114922721 B CN 114922721B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005485 electric heating Methods 0.000 claims abstract description 47
- 238000000746 purification Methods 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims description 14
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 66
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 239000004202 carbamide Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention belongs to the technical field of mixed diesel engine tail gas treatment, and discloses a tail gas heating control device and method for a mixed diesel engine. The control device of the invention realizes the heating control of the tail gas by arranging the electric heating device on the exhaust purification device. Aiming at the problem that the exhaust temperature of the tail gas of the hybrid diesel engine in the cold start and low-temperature interval operation working condition is low, the invention can quickly realize quick temperature rise of the hybrid diesel engine in the low-temperature low-load working condition, optimize the tail gas thermal management effect of the hybrid diesel engine and solve the problem that the exhaust temperature of the tail gas is low in the cold start working condition and the operation working condition.
Description
Technical Field
The invention relates to the technical field of tail gas treatment of hybrid diesel engines, in particular to a tail gas heating control device and method for a hybrid diesel engine.
Background
Along with the continuous aggravation of global problems such as energy shortage, environmental pollution and the like, new energy automobiles become a green and environment-friendly transportation means advocated currently. Aiming at the running environment and working condition of the commercial vehicle, the hybrid power mode is the best new energy automobile transition mode at present in a long period of time when the charging facility is not popularized and the battery technology is not broken through.
Under the working condition of low speed and low load, the temperature of the engine exhaust is low, and meanwhile, the high-efficiency area of the SCR (selective catalytic reduction) of the diesel engine is generally required to be more than 250 ℃, so that the pollution emission of the hybrid diesel engine is further reduced, and therefore the engine exhaust in a cold start and low temperature range is required to be heated.
In the prior art, the high-temperature energy of the tail gas is recycled, but attention to SCR efficiency when the temperature of the tail gas is insufficient is lacking, particularly, the low-temperature emission of the tail gas of the hybrid diesel engine is lacking, a thermal management scheme is lacking, the problem of exceeding standard emission of the tail gas exists, and the oil consumption is large.
Disclosure of Invention
The invention aims to provide an exhaust gas heating control device and method for a hybrid diesel engine, which are used for solving the problem that the exhaust gas temperature of the hybrid diesel engine is low in a cold start and low temperature range.
To achieve the purpose, the invention adopts the following technical scheme:
an exhaust gas heating control method for a hybrid diesel engine comprises the following steps:
s1, judging whether an engine is in a starting working condition, if so, executing a step S2, otherwise, heating tail gas in a periodic heating timing mode if the engine is in an operating working condition;
s2, calculating the average temperature of the SCR carrier;
s3, if the average temperature of the SCR carrier is smaller than a temperature threshold value, executing a step S4, otherwise executing a step S5;
s4, heating the tail gas, judging whether the heating time is less than a time threshold, and returning to the step S2 if the heating time is less than the time threshold; otherwise, executing the step S5;
s5, stopping heating.
Optionally, the time threshold in step S4 is a minimum value of any one of a maximum allowable heating time of the battery, a maximum allowable heating time of the exhaust gas flow rate, and a maximum allowable heating time of the SCR exhaust temperature control.
Optionally, the heating of the tail gas in the timing manner of the periodic heating in step S1 specifically includes:
heating single cycle duration = heating cycle number x heating duty cycle;
total heating duration = single heating cycle duration x number of heating cycles;
wherein the maximum value of the heating cycle number is the longest heating time or heating cycle allowed by the storage battery; and the heating duty ratio is obtained according to a heating duty ratio table of the driving working conditions corresponding to the average temperature of the SCR carrier.
The invention also provides an exhaust gas heating control device for the hybrid diesel engine, which comprises:
the electric heating device is arranged on the exhaust purification device and can heat tail gas in the exhaust purification device;
the storage battery is electrically connected with the electric heating device;
the electronic control unit is connected with the storage battery, detects the voltage of the storage battery, and carries out heating control on the electric heating device according to the tail gas heating control method for the hybrid diesel engine.
Optionally, the tail gas heating control device for the hybrid diesel engine further comprises a relay, the relay is connected with the electric heating device and the storage battery through a cable, the relay is in communication connection with the electronic control unit, the electronic control unit controls on-off of the relay, and the heating process of the electric heating device is controlled through the relay.
Optionally, the electronic control unit controls the on-off of the relay by adopting a PWM waveform.
Optionally, the electric heating device includes:
the other end of the binding post can be connected with the storage battery to heat tail gas in the exhaust purification device;
and the protective cover is provided with the other end of the binding post and is fixed on the exhaust purification device.
Optionally, the electric heating device is arranged at the top of the exhaust purification device, one end of the protecting cover facing the exhaust gas discharging direction is provided with an opening, and a grid structure is arranged on the protecting cover between the opening and the binding post.
Optionally, the electric heating device further includes a crimp terminal, a first end of the crimp terminal is cylindrical, the first end is threaded on a side wall of the exhaust purification device, the binding post is threaded and fixed at the first end, and a second end of the crimp terminal extends towards the exhaust gas discharge direction.
Optionally, the second end of the crimping terminal is a semi-cylindrical shell structure, an opening end of the semi-cylindrical shell structure is abutted to an outer side wall of the exhaust purification device, and a cable of the binding post can be led out from the semi-cylindrical shell structure.
The invention has the beneficial effects that:
the invention relates to a tail gas heating control method for a hybrid diesel engine, which aims at the problem that the tail gas exhaust temperature of the hybrid diesel engine is low under the working conditions of cold start and low temperature range.
According to the tail gas heating control device for the hybrid diesel engine, the storage battery is controlled by the electronic control unit to heat the electric heating device, and the electric heating device is arranged on the exhaust purification device, so that the tail gas in the exhaust purification device is heated, and the test result shows that the electric heating can advance the urea spraying time, and the removal rate of nitrogen oxides is greatly increased.
Drawings
FIG. 1 is a flow chart of an exhaust heating control method for a hybrid diesel engine according to the present invention;
FIG. 2 is a schematic view of a first angle configuration of an exhaust heating control apparatus for a hybrid diesel engine according to the present invention;
FIG. 3 is a schematic view of a second angular configuration of an exhaust heating control apparatus for a hybrid diesel engine according to the present invention;
FIG. 4 is a schematic view of a first angular configuration of a crimp terminal in an exhaust heating control device for a hybrid diesel engine according to the present invention;
fig. 5 is a second angular structural schematic diagram of a crimp terminal in an exhaust gas heating control device for a hybrid diesel engine according to the present invention.
In the figure:
100. an exhaust gas purifying device;
1. an electric heating device; 11. binding posts; 12. a protective cover; 13. crimping the terminal; 131. a first end; 132. a second end; 1321. a spring plate;
2. a storage battery; 3. an electronic control unit; 4. and a relay.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The invention provides a tail gas heating control method for a hybrid diesel engine, which is shown in a flow chart in fig. 1 and comprises the following steps:
s1, judging whether an engine is in a starting working condition, if so, executing a step S2, otherwise, heating tail gas in a periodic heating timing mode if the engine is in an operating working condition;
s2, calculating the average temperature of the SCR carrier;
in some embodiments, SCR carrier average temperature T mean According to SCR inlet temperature T An inlet SCR outlet temperature T An outlet The calculation is carried out, specifically:
T mean ＝T an inlet ×f+T An outlet (1-f)
Wherein f is a weight coefficient, and f is more than 0 and less than 1.
Of course, the calculation method of the average temperature of the SCR carrier is not limited to the above calculation method, and other methods in the prior art can be adopted under the requirements of calculation accuracy and calculation speed, and the embodiment is not limited.
S3, if the average temperature of the SCR carrier is smaller than a temperature threshold value, executing a step S4, otherwise executing a step S5;
the temperature threshold is a target control temperature, and is obtained by calibrating in advance through modes such as experiments according to parameters such as SCR efficiency or urea start-up time, and the temperature threshold is a set value in the embodiment.
S4, starting to heat the exhaust gas, judging whether the heating time is less than a time threshold, and returning to the step S2 if the heating time is less than the time threshold; otherwise, executing the step S5;
s5, stopping heating.
When the engine is started, the exhaust temperature of the engine is relatively low due to low exhaust temperature of the engine, the SCR conversion efficiency is low, the emission is poor, the SCR carrier temperature is rapidly improved by heating tail gas, the SCR conversion efficiency is improved, the emission is further optimized, and secondly, when the engine is operated in a mixed operation condition, if the whole engine is always operated in a pure electric mode, the exhaust temperature of the engine is relatively reduced, and when the engine is restarted, the condition of low exhaust temperature exists, so that the electric heating mode can improve the low exhaust temperature under the starting condition and the operation condition, and the emission is further optimized. It will be appreciated that the engine operating conditions referred to in this embodiment refer to low temperature conditions in a hybrid diesel engine.
The invention discloses a tail gas heating control method for a hybrid diesel engine, which aims at the problem that the tail gas exhaust temperature of the hybrid diesel engine is low under the working conditions of cold start and low temperature range.
Optionally, the time threshold in step S4 is a minimum value of any one of a maximum allowable heating time of the battery, a maximum allowable heating time of the exhaust gas flow rate, and a maximum allowable heating time of the SCR exhaust temperature control.
In this embodiment, the time threshold is the maximum heating time for heating the tail gas under the starting condition, and is limited by the three conditions, and the three maximum allowable heating times are compared to find the minimum value and serve as the time threshold. Wherein, the maximum allowable heating time of the storage battery belongs to a standard value, and is generally 1800s. The other two are set according to actual conditions.
Optionally, the tail gas is heated in the timing manner of periodic heating in step S1, specifically:
heating single cycle duration = heating cycle number x heating duty cycle;
total heating duration = single heating cycle duration x number of heating cycles;
wherein the maximum value of the heating cycle number is the longest heating time or heating cycle allowed by the storage battery; the heating duty ratio is obtained according to a driving working condition heating duty ratio table corresponding to the average temperature of the SCR carrier.
The invention also provides a tail gas heating control device for the hybrid diesel engine, which is used for realizing the tail gas heating control method for the hybrid diesel engine.
As shown in fig. 2, the exhaust gas heating control apparatus for a hybrid diesel engine includes an electric heating apparatus 1, a battery 2, and an electronic control unit 3, the electric heating apparatus 1 being provided on an exhaust gas purification apparatus 100, capable of heating exhaust gas in the exhaust gas purification apparatus 100; the storage battery 2 is electrically connected with the electric heating device 1; the electronic control unit 3 is connected with the storage battery 2, and the electronic control unit 3 detects the voltage of the storage battery 2 and carries out heating control on the electric heating device 1 according to the working condition of the engine.
According to the tail gas heating control method for the hybrid diesel engine provided by the embodiment of the invention, the electronic control unit 3 performs heating control on the electric heating device 1, and the electric heating device 1 heats the tail gas on the premise of allowing the voltage of the storage battery 2 through the electric heating power supply provided by the storage battery 2, so that the normal working voltage of the storage battery 2 is not influenced. The exhaust gas purification device 100 is disposed on an exhaust pipe, and the SCR carrier and the electric heating carrier EHC are disposed in the exhaust gas purification device 100, so that the urea start-up time can be increased and the emission of nitrogen oxides can be reduced by heating the exhaust gas.
According to the tail gas heating control device for the hybrid diesel engine, the electronic control unit 3 controls the storage battery 2 to heat the electric heating device 1, and the electric heating device 1 is arranged on the exhaust purification device 100, so that the tail gas in the exhaust purification device 100 is heated. Bench test verification is carried out, based on a cold WHTC test cycle, 4kW electric heating can advance the urea start-spraying time from 562s to 198s, and nitrogen oxide NOx is reduced from 1.1g/kWh to 0.4g/kWh; the 2kW electric heating can advance the urea start-up time to 256s, and the nitrogen oxide NOx is reduced to 0.69g/kWh.
Optionally, the tail gas heating control device for the hybrid diesel engine further comprises a relay 4, the relay 4 is connected with the electric heating device 1 and the storage battery 2 through a cable, the relay 4 is in communication connection with the electronic control unit 3, the electronic control unit 3 controls on-off of the relay 4 according to the voltage of the storage battery 2 and the working condition of the engine, and the heating process of the electric heating device 1 is controlled through the relay 4.
As shown in fig. 2, when the relay 4 is turned on, the storage battery 2 can supply power to the electric heating device 1 for heating, and when the monitored voltage of the storage battery 2 reaches a critical value, or a short circuit occurs, or a heating cycle of the electric heating device 1 ends, or the electric heating device 1 needs to stop heating, the electronic control unit 3 controls the relay 4 to be turned off, and the electric heating device 1 stops heating.
Alternatively, the electronic control unit 3 controls the on-off of the relay 4 using PWM waveforms. In this embodiment, the electronic control unit is a vehicle-mounted ECU unit, and can obtain the SCR inlet temperature, the SCR outlet temperature, calculate the SCR carrier average temperature according to the SCR inlet temperature and the SCR outlet temperature, and also obtain parameters such as exhaust flow, which are used for realizing the intelligent control of heating the tail gas of the hybrid diesel engine and optimizing the tail gas thermal management effect of the hybrid diesel engine.
Alternatively, the electric heating device 1 includes a terminal 11 and a protective cover 12, one end of the terminal 11 is penetrated through a side wall of the exhaust gas purifying device 100 from outside to inside and extends to the opposite side for fixation, and the other end of the terminal 11 can be connected with the battery 2 to heat the exhaust gas in the exhaust gas purifying device 100; the protective cover 12 covers the other end of the post 11 and is fixed to the exhaust gas purification device 100.
As shown in fig. 3, the binding post 11 is rod-shaped, and penetrates through the exhaust passage of the exhaust purification device 100, the binding post 11 adopts a resistance heating principle, when the storage battery 2 is electrified and heated for the binding post 11, the effect of heating tail gas by the binding post 11 can be improved, and the two ends are fixed, so that the stability is good. In this embodiment, the protective cover 12 is provided at the end of the post 11 mainly for rainwater protection, and in general, the electric heater 1 is provided at the top of the exhaust gas purifying device 100, one end of the protective cover 12 facing the exhaust gas discharging direction has an opening, and a grid structure is provided on the protective cover 12 between the opening and the post 11, and the grid structure has a heat radiation effect. The protection cover 12 is arranged at the top end of the binding post 11 in a covering mode, and risks such as short circuit and the like caused by rainwater sputtering can be prevented. Since the temperature of the electric heating terminal 11 is generally 200-300 ℃, and the ambient temperature may reach more than 500 ℃ if the ambient temperature is 170 ℃, in this embodiment, the protection cover 12 is made of a nonmetallic insulating material, and is provided with a grid for heat dissipation, and the protection cover 12 is detachably connected with the exhaust gas purification device 100, in this embodiment, is bolted, so as to facilitate maintenance.
Optionally, as shown in fig. 4 and 5, the electric heating device 1 further includes a crimp terminal 13, a first end 131 of the crimp terminal 13 is cylindrical, the first end 131 is disposed on a side wall of the exhaust gas purifying device 100 in a penetrating manner, the terminal 11 is disposed on the first end 131 in a penetrating manner, and a second end 132 of the crimp terminal 13 extends toward the exhaust gas discharging direction. In some embodiments, the second end 132 of the crimp terminal 13 is a semi-cylindrical shell structure from which the cable of the post 11 can be led out, with an open end of the semi-cylindrical shell structure abutting against the outer sidewall of the exhaust gas purification device 100. In other embodiments, the second end 132 has an open end formed by a plurality of sets of elastic sheets 1321, and the lead cable of the terminal 11 can be inserted into the plurality of sets of elastic sheets 1321 to be positioned and guided, and the second end 132 extends to a length not exceeding the open end face of the protective cover 12.
The invention discloses an electric heating-based tail gas heating control method and device for rapidly improving the tail gas temperature in a cold start and low temperature zone of a hybrid diesel engine, which mainly comprise an ECU internal heating control method and an electric heating device 1, wherein the electric heating device 1 is controlled by monitoring the SCR inlet temperature and simultaneously synthesizing working conditions, so that the rapid improvement target of the tail gas temperature of the hybrid diesel engine is realized.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. An exhaust gas heating control method for a hybrid diesel engine is characterized by comprising the following steps:
s1, judging whether an engine is in a starting working condition, if so, executing a step S2, otherwise, heating tail gas in a periodic heating timing mode if the engine is in an operating working condition;
the timing mode of periodic heating heats the tail gas, and specifically comprises the following steps:
heating single cycle duration = heating cycle number x heating duty cycle;
total heating duration = single heating cycle duration x number of heating cycles;
wherein the maximum value of the heating cycle number is the longest heating time or heating cycle allowed by the storage battery (2); the heating duty ratio is obtained according to a heating duty ratio table of driving conditions corresponding to the average temperature of the SCR carrier;
s2, calculating the average temperature of the SCR carrier;
s3, if the average temperature of the SCR carrier is smaller than a temperature threshold value, executing a step S4, otherwise executing a step S5;
s4, heating the tail gas, judging whether the heating time is less than a time threshold, and returning to the step S2 if the heating time is less than the time threshold; otherwise, executing the step S5;
the time threshold is a minimum value of any one of the maximum allowable heating time of the storage battery (2), the maximum allowable heating time of the exhaust flow and the maximum allowable heating time of the SCR exhaust temperature control;
s5, stopping heating;
wherein, to tail gas heating adopts electric heater unit (1), electric heater unit (1) includes:
the terminal (11), one end of the terminal (11) is penetrated through the side wall of the exhaust purification device (100) from outside to inside and extends to the opposite side for fixation, and the other end of the terminal (11) can be connected with the storage battery (2) to heat the tail gas in the exhaust purification device (100);
and a protective cover (12), wherein the protective cover (12) covers the other end of the binding post (11) and is fixed on the exhaust gas purification device (100).
2. An exhaust gas heating control apparatus for a hybrid diesel engine, comprising:
an electric heating device (1), wherein the electric heating device (1) is arranged on an exhaust gas purification device (100) and can heat exhaust gas in the exhaust gas purification device (100);
a storage battery (2), wherein the storage battery (2) is electrically connected with the electric heating device (1);
the electronic control unit (3), the electronic control unit (3) is connected with the storage battery (2), the electronic control unit (3) detects the voltage of the storage battery (2) and carries out heating control on the electric heating device (1) according to the tail gas heating control method for the hybrid diesel engine according to claim 1.
3. The exhaust gas heating control device for a hybrid diesel engine according to claim 2, further comprising a relay (4), wherein the relay (4) connects the electric heating device (1) and the storage battery (2) through a cable, the relay (4) is in communication connection with the electronic control unit (3), the electronic control unit (3) controls on-off of the relay (4), and the heating process of the electric heating device (1) is controlled through the relay (4).
4. The exhaust gas heating control apparatus for a hybrid diesel engine according to claim 3, wherein the electronic control unit (3) controls the on-off of the relay (4) using a PWM waveform.
5. The exhaust gas heating control device for a hybrid diesel engine according to claim 2, characterized in that the electric heating device (1) includes:
the wiring terminal (11), one end of the wiring terminal (11) is penetrated through the side wall of the exhaust purification device (100) from outside to inside and extends to the opposite side for fixation, and the other end of the wiring terminal (11) can be connected with the storage battery (2) to heat the tail gas in the exhaust purification device (100);
and a protective cover (12), wherein the protective cover (12) covers the other end of the binding post (11) and is fixed on the exhaust gas purification device (100).
6. The exhaust gas heating control apparatus for a hybrid diesel engine according to claim 5, wherein the electric heating apparatus (1) is provided at a top of the exhaust gas purifying apparatus (100), an end of the protective cover (12) facing in an exhaust gas discharging direction has an opening, and a grid structure is provided on the protective cover (12) between the opening and the post (11).
7. The exhaust gas heating control apparatus for a hybrid diesel engine according to claim 5, wherein the electric heating apparatus (1) further includes a crimp terminal (13), a first end (131) of the crimp terminal (13) is cylindrical, the first end (131) is pierced on a side wall of the exhaust gas purifying apparatus (100), the post (11) is pierced and fixed at the first end (131), and a second end (132) of the crimp terminal (13) extends toward the exhaust gas discharging direction.
8. The exhaust gas heating control apparatus for a hybrid diesel engine according to claim 7, characterized in that the second end (132) of the crimp terminal (13) is a semi-cylindrical shell structure, an open end of which is abutted against an outer side wall of the exhaust gas purification apparatus (100), from which a cable of the post (11) can be led out.
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| US11428136B2 (en) * | 2020-07-21 | 2022-08-30 | Paccar Inc | Heater diagnostics in heavy-duty motor vehicle engines |
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| CN103670629A (en) * | 2012-09-20 | 2014-03-26 | 北汽福田汽车股份有限公司 | Urea pipe heating control method of selective catalytic reduction (SCR) post-processing system of engine |
| CN111322139A (en) * | 2018-12-13 | 2020-06-23 | 罗伯特·博世有限公司 | Method for heating an exhaust system of an internal combustion engine of a motor vehicle |
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