CN111794836A - Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump - Google Patents
Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump Download PDFInfo
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- CN111794836A CN111794836A CN202010639001.6A CN202010639001A CN111794836A CN 111794836 A CN111794836 A CN 111794836A CN 202010639001 A CN202010639001 A CN 202010639001A CN 111794836 A CN111794836 A CN 111794836A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 164
- 239000004202 carbamide Substances 0.000 title claims abstract description 164
- 238000004891 communication Methods 0.000 claims abstract description 44
- 230000003993 interaction Effects 0.000 claims abstract description 20
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 description 21
- 239000007924 injection Substances 0.000 description 21
- 238000005086 pumping Methods 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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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
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Computer Hardware Design (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a control device compatible with an electric drive urea pump and an air auxiliary urea pump, which comprises a single chip microcomputer, an optocoupler module and a CAN communication module, wherein: the optical coupling module is connected to the single chip microcomputer and is used for being connected with a vehicle ECU or an electrically-driven urea pump so as to realize PWM signal interaction between the single chip microcomputer and the vehicle ECU or the electrically-driven urea pump; the CAN communication module is connected to the single chip microcomputer and is used for being connected with the air-assisted urea pump or the vehicle ECU so as to achieve CAN message signal interaction between the single chip microcomputer and the air-assisted urea pump or the vehicle ECU. Compared with the prior art, the invention can realize the compatibility of the vehicle ECU with the air-assisted urea pump and the electric-driven urea pump, so that the vehicle ECU can realize the signal interaction of the air-assisted urea pump and the electric-driven urea pump. Thus, when the urea pump of the vehicle needs to be configured or replaced, the air-assisted urea pump or the electric-driven urea pump can be freely selected.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a control device compatible with an electric drive urea pump and an air auxiliary urea pump.
Background
In order to protect the environment, relevant regulations for controlling the exhaust emission of automobile exhaust are successively issued by countries in the world, and the increasingly strict emission regulations make it difficult for a simple internal purification technology to meet the requirements of the regulations, and the internal purification technology must be assisted by an external post-treatment technology. In the aspect of off-board technical treatment, at present, various diesel engine companies and whole factories in China mainly adopt a selective catalytic reduction system technology to control the emission of nitrogen oxides of diesel engines, and the selective catalytic reduction system needs to adopt a urea pump to extract urea solution from a urea box and inject the urea solution into an exhaust pipe with certain precision. The urea pump is divided into an air-assisted urea pump and an electric-driven urea pump according to a jet driving mode.
The air-assisted urea pump is driven by CAN message signals, urea metering is completed in the urea pump, and the metered urea solution is sprayed out by compressed air. In order to realize the injection control of the gas-assisted urea pump, when the vehicle leaves a factory, the communication mode of the vehicle ECU needs to be set, so that the CAN message signal interaction between the vehicle ECU and the gas-assisted urea pump CAN be realized. The nozzle of the air-assisted urea pump has a simple structure and is high-temperature resistant, but the air-assisted urea pump also has the obvious defects of high cost, long injection delay, high failure rate and the like due to the fact that compressed air needs to be prepared in a vehicle.
The electrically-driven urea pump drives a motor to absorb and accumulate liquid pressure by a PWM signal, the pressure in a pump cavity is kept stable, the pump cavity is connected to a urea nozzle, and metering injection is controlled by a urea nozzle electromagnetic valve switch. Similarly, in order to realize the injection control of the electrically-driven urea pump, the communication mode of the vehicle ECU needs to be set during delivery so as to realize the PWM signal interaction with the electrically-driven urea pump. The electrically-driven urea pump does not need to be provided with compressed air, has quick injection response, but also has obvious defects, realizes injection metering and adjustment by virtue of an electromagnetic valve in a nozzle, and is not high in temperature resistance and easy to damage due to overtemperature.
At present, when the automobile leaves the factory, the communication mode of the vehicle ECU is preset, so that the ECU can only realize signal interaction with one type of urea pump, namely, if the air-assisted urea pump is arranged on the vehicle, only the air-assisted urea pump can be replaced when the urea pump needs to be replaced, and the electric-driven urea pump cannot be replaced. Similarly, if an electrically driven urea pump is provided on the vehicle, the electrically driven urea pump can still only be replaced, and not the air-assisted urea pump, if the urea pump needs to be replaced.
The aim of the invention is to develop a control device compatible with an electrically driven urea pump and an air-assisted urea pump, which control device enables the vehicle ECU to be compatible with an air-assisted urea pump and an electrically driven urea pump. The vehicle ECU can realize signal interaction with the air-assisted urea pump and can also realize signal interaction with the electric-driven urea pump. Thus, when the urea pump of the vehicle needs to be configured or replaced, the air-assisted urea pump or the electric-driven urea pump can be freely selected.
Disclosure of Invention
In order to achieve the technical aim, the invention provides a control device compatible with an electric drive urea pump and an air auxiliary urea pump, which has the following specific technical scheme:
the utility model provides a CAN compatible electricity drive urea pump and air assist controlling means of urea pump, includes singlechip, opto-coupler module and CAN communication module, wherein:
the optical coupling module is connected to the single chip microcomputer and is used for being connected with a vehicle ECU or an electrically-driven urea pump so as to realize PWM signal interaction between the single chip microcomputer and the vehicle ECU or the electrically-driven urea pump;
the CAN communication module is connected to the single chip microcomputer and is used for being connected with the air-assisted urea pump or the vehicle ECU so as to achieve CAN message signal interaction between the single chip microcomputer and the air-assisted urea pump or the vehicle ECU.
In some embodiments, the optical coupling module is connected with a vehicle ECU, and the CAN communication module is connected with an air-assisted urea pump; the single chip microcomputer is configured to receive PWM control signals sent by a vehicle ECU through the optocoupler module and send the control signals to the air-assisted urea pump through the CAN communication module, and the single chip microcomputer is further configured to obtain operation parameters of the air-assisted urea pump through the CAN communication module and feed the obtained operation parameters back to the vehicle ECU through the optocoupler module.
In some embodiments, the CAN communication module is connected with a vehicle ECU, and the optical coupling module is connected with an electrically-driven urea pump; the single chip microcomputer is configured to receive a CAN message control signal sent by a vehicle ECU through the CAN communication module and send the control signal to the electrically-driven urea pump through the optocoupler module, and the single chip microcomputer is further configured to acquire operating parameters of the electrically-driven urea pump through the optocoupler module and feed the acquired operating parameters back to the vehicle ECU through the CAN communication module.
In some embodiments, the single chip microcomputer adopts a single chip microcomputer chip with the model number of STM32F103VET 6.
In some embodiments, the CAN communication module adopts a CAN communication chip with model number Tja 1050.
In some embodiments, the optical coupling module is a 6N137 optical coupling module.
Compared with the prior art, the invention can realize the compatibility of the vehicle ECU with the air-assisted urea pump and the electric-driven urea pump, so that the vehicle ECU can realize the signal interaction of the air-assisted urea pump and the electric-driven urea pump. Thus, when the urea pump of the vehicle needs to be configured or replaced, the air-assisted urea pump or the electric-driven urea pump can be freely selected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings which are needed in the embodiments and are practical will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. Wherein,
fig. 1 is a schematic structural diagram of a urea pump detection device provided by the invention in an operating state.
Fig. 2 is a schematic structural diagram of a urea pump detection device provided by the invention in another working state.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
At present, when the automobile leaves the factory, the communication mode of the vehicle ECU is preset, so that the communication mode can only realize signal interaction with one type of urea pump, namely, if the air-assisted urea pump is configured on the vehicle, only the air-assisted urea pump can be replaced when the urea pump needs to be replaced, and the electric-driven urea pump cannot be replaced. Similarly, if an electrically driven urea pump is provided on the vehicle, the electrically driven urea pump can still only be replaced, and not the air-assisted urea pump, if the urea pump needs to be replaced.
The aim of the invention is to develop a control device compatible with an electrically driven urea pump and an air-assisted urea pump, which control device enables the vehicle ECU to be compatible with an air-assisted urea pump and an electrically driven urea pump. The vehicle ECU can realize signal interaction with the air-assisted urea pump and can also realize signal interaction with the electric-driven urea pump. Thus, when the urea pump of the vehicle needs to be configured or replaced, the air-assisted urea pump or the electric-driven urea pump can be freely selected.
As shown in fig. 1 and fig. 2, the control device 100 compatible with an electric-driven urea pump and an air-assisted urea pump provided by the present invention includes a single chip 101, an optical coupling module 102 and a CAN communication module 103, wherein:
the optical coupling module 102 is connected to the single chip microcomputer 101, and the optical coupling module 102 is used for being connected with a vehicle ECU or an electrically-driven urea pump so as to achieve PWM signal interaction between the single chip microcomputer 101 and the vehicle ECU or the electrically-driven urea pump.
The CAN communication module 103 is connected to the single chip microcomputer 101, and the CAN communication module 103 is used for being connected with the air-assisted urea pump or the vehicle ECU so as to realize CAN message signal interaction between the single chip microcomputer 101 and the air-assisted urea pump or the vehicle ECU.
As shown in fig. 1, in some application scenarios, when the vehicle leaves the factory, the communication mode of the vehicle ECU is based on the CAN message signal, that is, the control signal sent by the vehicle ECU is the CAN message control signal, so that the urea pump installed when the vehicle leaves the factory is the air-assisted urea pump.
In these application scenarios, the vehicle ECU is compatible with the electrically driven urea pump 200. Specifically, the single chip microcomputer 101 receives a CAN message control signal sent by the vehicle ECU through the CAN communication module 103, recognizes the CAN message control signal, and sends a PWM control signal matched with the CAN message control signal to the electrically-driven urea pump 200 through the optocoupler module 102 so as to drive the electrically-driven urea pump 200 to act.
In addition, the single chip microcomputer 101 acquires the operation parameters of the electrically-driven urea pump 200 through the optocoupler module 102, and feeds the acquired operation parameters back to the vehicle ECU through the CAN communication module 103.
As shown in fig. 2, in some other application scenarios, when the vehicle leaves the factory, the communication mode of the vehicle ECU is based on the PWM signal, that is, the control signal sent by the vehicle ECU is the PWM control signal, so that the urea pump installed when the vehicle leaves the factory is an electrically driven urea pump.
In these application scenarios, the vehicle ECU is compatible with the air-assisted urea pump 300. Specifically, the single chip microcomputer 101 receives a PWM control signal sent by the vehicle ECU through the optical coupling module 102 and recognizes the PWM control signal, and then sends a CAN message control signal matched with the PWM control signal to the air-assisted urea pump 300 through the CAN communication module 103 to drive the air-assisted urea pump 300 to act.
In addition, the single chip microcomputer 101 acquires the operation parameters of the air-assisted urea pump 300 through the CAN communication module 103, and feeds the acquired operation parameters back to the vehicle ECU through the optocoupler module 102.
Alternatively, as shown in fig. 1 and 2. The single chip microcomputer 101 adopts a single chip microcomputer chip with the model number of STM32F103VET6, and the single chip microcomputer chip provides 4 paths of PWM signal output/acquisition channels and one path of ADS signal acquisition channel. The CAN communication chip adopts a CAN communication chip with the model number Tja 1050. The optical coupling module is 6N137, and the optical coupling module can realize transmission interchange of 3.3V and 12V/24V pulse signals.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the following will exemplarily describe the working process of the present invention with two more specific embodiments.
First embodiment, as shown in fig. 1, an electrically driven urea pump 200 is substituted for an air-assisted urea pump 300 of the original vehicle configuration.
In this embodiment, before replacing the urea pump, the vehicle ECU sends a CAN message control signal to drive the air-assisted urea pump 300 to operate.
After the assembly of the present invention is completed and the electrically driven urea pump 200 is replaced. The signal interaction between the vehicle ECU and the electrically driven urea pump 200 is as follows:
and the vehicle ECU sends a CAN message control signal.
The single chip microcomputer 101 recognizes a CAN message control signal sent by the vehicle ECU, converts the CAN message control signal into a PWM control signal, and sends the PWM control signal to the electrically-driven urea pump 200 to control the electrically-driven urea pump 200. Specifically, for example:
when the single chip microcomputer 101 recognizes that the CAN message is a pump stop command, the single chip microcomputer 101 does not generate a driving signal, and the electrically driven urea pump 200 maintains a stop state.
When the single chip microcomputer 101 recognizes that the CAN message is a pre-injection command, the single chip microcomputer 101 sends a low level signal with a duty ratio of 27% to a motor of the electrically-driven urea pump 200, the low level signal lasts for 10 seconds, the electrically-driven urea pump 200 is controlled to carry out open-loop pressure accumulation, then a closed-loop pressure building process is carried out, for example, a Bosch 6.5 type electrically-driven urea pump, the target pump pressure is 500Kpa, a pressure sensor outputs 2.9V voltage, PWM drives the low level to be in direct proportion to the rotating speed of the motor to be in direct proportion to the pressure of the urea pump, and the closed-loop control. When the pressure of the pressure accumulation cavity is stabilized within 500 +/-5 Kpa and is kept for 10 seconds, the singlechip 101 replies a pressure build-up completion signal to the vehicle ECU.
When the single chip microcomputer 101 recognizes that the CAN message is an injection request command, the single chip microcomputer 101 further recognizes injection amount information in the injection request command, converts the injection amount information into the opening degree of the solenoid valve electrically driving the nozzle of the urea pump 200, and then sends a PWM signal to the electrically driven urea pump 200 to command the nozzle thereof to be opened.
When the single chip microcomputer 101 recognizes that the CAN message is an emptying and purging command, the single chip microcomputer 101 controls a motor of the electrically-driven urea pump 200 to stop rotating, and the pressure in the pump is reduced. The single chip microcomputer 101 collects the pressure in the pump, when the pressure is lower than 300Kpa, the single chip microcomputer 101 sends a 6HZ reverse pumping PWM control signal to the electrically-driven urea pump 200, and the electrically-driven urea pump 200 enters a reverse pumping state for 60 seconds. The one-chip microcomputer 101 then feeds back the stop state to the vehicle ECU.
In addition, the single chip microcomputer 101 sends a PWM communication request to the electrically-driven urea pump 200 to obtain information such as the temperature and the motor speed of the electrically-driven urea pump 200, and feeds back the obtained information to the vehicle ECU in a CAN communication manner.
Second embodiment, as shown in fig. 2, the electrically driven urea pump 200 of the original vehicle configuration is replaced with an air-assisted urea pump 300.
In this embodiment, the vehicle ECU sends a four-way PWM signal to control the operation of the electrically driven urea pump 200 and the spray nozzles prior to replacing the urea pump.
After the assembly of the present invention is completed and the air-assisted urea pump 300 is replaced. The signal interaction between the vehicle ECU and the gas-assisted urea pump 300 is as follows:
the single chip microcomputer 101 recognizes a PWM signal sent from the vehicle ECU to recognize in what state the air-assisted urea pump 300 needs to operate and whether heating is required at the present time. For example:
during the pressure accumulation process, the singlechip 101 recognizes a 100HZ PWM signal sent by the ECU on a pump motor driving signal line through the optical coupling module 102, and indicates that the ECU requests to electrically drive the pump for pressure accumulation. The single chip microcomputer 101 orders the air-assisted urea pump 300 to enter a pre-injection state through the CAN communication module 103, the air-assisted urea pump 300 feeds back a CAN signal after pre-injection is completed, and the single chip microcomputer 101 outputs 2.9V voltage after recognizing that the CAN signal is fed back, namely the current pump pressure of the feedback ECU is 500 Kpa. The output voltage of the singlechip 101 starts to rise after receiving a PWM signal sent by the ECU, if the output voltage meets the PWM signal sent by the inverted pumping signal line ECU in the rising process, the pump pressure starts to fall, and the action is the detection of the simulated electrically-driven pump return pipe. The single chip microcomputer 101 detects that the first PWM low level appears on the urea nozzle driving line and the duty ratio is larger than 50%, which indicates that the injection pipe/nozzle blockage detection is carried out, the simulation pressure is reduced to 400Kpa for 2 seconds, and then the simulation pressure is recovered.
During the back-pumping process, the single chip microcomputer 101 recognizes that the ECU sends a PWM signal on a back-pumping signal line of the pump motor through the optical coupling module 102, the ECU has a back-pumping request, a pressure and voltage signal of the simulation pump output by the single chip microcomputer 101 drops, and in order to prevent confusion with return pipe detection, when the back-pumping request lasts for more than 20 seconds, the single chip microcomputer 101 orders the air-assisted urea pump 300 to enter an emptying state through the CAN communication module 103, the simulation voltage continuously drops, and after 60 seconds, the simulation voltage reaches 0.8V simulation-25 Kpa.
During the injection process, the singlechip 101 calculates the conversion of the injection amount, and the injection amount of the air-assisted urea pump 300 is sent through a CAN message, if the injection amount is equal to the first 4 bytes of the CAN message multiplied by 0.01 ml/h. The injection metering of the electrically-driven urea pump 200 is similar to that of a diesel high-pressure common rail, except that the pressure is low and the rail pressure is unchanged, the stable pressure of 500Kpa is kept in the pressure accumulation cavity, the metering is realized by opening a nozzle, and the injection amount is about the duty ratio of the opening degree of the electromagnetic valve multiplied by 54.5 ml/h. The singlechip 101 can obtain the conversion relation between the message bytes and the ratio of the occupied width through conversion, and finally, the injection quantity exchange is realized.
If a heating request exists, the singlechip 101 can recognize that the ECU sends a PWM signal on a pump heating signal line through the optocoupler module 102. The single chip microcomputer 101 commands the air-assisted urea pump 300 to enter a heating state through the CAN communication module 103.
The CAN communication content comprises signals such as pump cavity temperature and motor speed sent by the air-assisted urea pump 300. When the single chip microcomputer 101 recognizes that the vehicle ECU sends a data request signal through the opto-coupler module 102, such information of the EUC is replied in the form of the duty ratio.
The invention has been described above with a certain degree of particularity. It will be understood by those of ordinary skill in the art that the description of the embodiments is merely exemplary and that all changes that come within the true spirit and scope of the invention are desired to be protected. The scope of the invention is defined by the appended claims rather than by the foregoing description of the embodiments.
Claims (6)
1. A control device capable of being compatible with an electrically-driven urea pump and an air-assisted urea pump is characterized in that: the control device comprises a single chip microcomputer, an optocoupler module and a CAN communication module, wherein:
the optical coupling module is connected to the single chip microcomputer and is used for being connected with a vehicle ECU or an electrically-driven urea pump so as to realize PWM signal interaction between the single chip microcomputer and the vehicle ECU or the electrically-driven urea pump;
the CAN communication module is connected to the single chip microcomputer and is used for being connected with the air-assisted urea pump or the vehicle ECU so as to achieve CAN message signal interaction between the single chip microcomputer and the air-assisted urea pump or the vehicle ECU.
2. The control apparatus of claim 1, wherein:
the optical coupling module is connected with an ECU of a vehicle, and the CAN communication module is connected with an air-assisted urea pump;
the single chip microcomputer is configured to receive PWM control signals sent by a vehicle ECU through the optocoupler module and send the control signals to the air-assisted urea pump through the CAN communication module, and the single chip microcomputer is further configured to obtain operation parameters of the air-assisted urea pump through the CAN communication module and feed the obtained operation parameters back to the vehicle ECU through the optocoupler module.
3. The control apparatus of claim 1, wherein:
the CAN communication module is connected with a vehicle ECU, and the optocoupler module is connected with an electrically-driven urea pump;
the single chip microcomputer is configured to receive a CAN message control signal sent by a vehicle ECU through the CAN communication module and send the control signal to the electrically-driven urea pump through the optocoupler module, and the single chip microcomputer is further configured to acquire operating parameters of the electrically-driven urea pump through the optocoupler module and feed the acquired operating parameters back to the vehicle ECU through the CAN communication module.
4. The control apparatus of claim 1, wherein: the single chip microcomputer is a single chip microcomputer chip with the model number of STM32F103VET 6.
5. The control apparatus of claim 1, wherein: the CAN communication module adopts a CAN communication chip with the model number Tja 1050.
6. The control apparatus of claim 1, wherein: the optical coupling module is 6N 137.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010639001.6A CN111794836A (en) | 2020-07-06 | 2020-07-06 | Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010639001.6A CN111794836A (en) | 2020-07-06 | 2020-07-06 | Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111794836A true CN111794836A (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010639001.6A Pending CN111794836A (en) | 2020-07-06 | 2020-07-06 | Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump |
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| CN (1) | CN111794836A (en) |
Cited By (1)
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| CN114109566A (en) * | 2021-09-28 | 2022-03-01 | 山东康钧环保科技有限公司 | Generating set SCR system control strategy and purifier |
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| CN114109566A (en) * | 2021-09-28 | 2022-03-01 | 山东康钧环保科技有限公司 | Generating set SCR system control strategy and purifier |
| CN114109566B (en) * | 2021-09-28 | 2023-10-31 | 山东修时环保科技有限公司 | Control strategy and purification device of SCR system of generator set |
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Application publication date: 20201020 |