CN114458463A - Engineering machinery emission thermal management system and method and engineering machinery - Google Patents
Engineering machinery emission thermal management system and method and engineering machinery Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/1425—Controller structures or design using a bond graph model or models with nodes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the technical field of engineering machinery, and discloses a thermal management system and method for engineering machinery emission and engineering machinery, wherein the thermal management system comprises an engine, a hydraulic pump, a reversing valve and a working oil cylinder which are sequentially connected, wherein a post-treatment device is arranged in the tail gas direction of the engine, the hydraulic pump is a variable pump, and the post-treatment device is used for treating exhaust in an exhaust system of the engine or a diesel engine; the device also comprises a complete machine controller, a control unit, a pressure sensor and a pressure regulating valve; the pressure sensor is arranged at the outlet of the hydraulic pump or between the hydraulic pump and the reversing valve, and is used for acquiring the pressure in the pipeline and transmitting the acquired pressure data to the complete machine controller; the whole machine controller is respectively and electrically connected with the control unit, the pressure sensor, the hydraulic pump and the pressure regulating valve; the control unit is electrically connected with the post-processing device, the engine and the complete machine controller respectively. The invention has the beneficial effects that: the exhaust temperature can be improved, and the purpose of heat management is achieved.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a system and a method for SCR (selective catalytic reduction) heat management primary heating for aftertreatment heat management of a diesel engine of a hydraulic excavator and the engineering machinery.
Background
A selective catalytic reduction device, SCR for short, refers to an exhaust gas aftertreatment device that is installed in an engine exhaust system to perform selective catalytic reduction of nitrogen oxides in exhaust gas to reduce the emission of nitrogen oxides.
An oxidation type catalytic converter, DOC for short, refers to an exhaust gas post-processing device that is installed in an exhaust system of a diesel engine and can reduce the emission of pollutants such as carbon monoxide, hydrocarbons, and SOF (soluble organic compounds) in particulate matters in exhaust gas through catalytic oxidation reaction.
A diesel particulate filter, DPF for short, is a device installed in an exhaust system of a diesel vehicle to reduce particulate matter in exhaust gas by filtration.
The SCR post-treatment technology is a main technical means for reducing nitrogen oxides in the tail gas of a diesel engine, and the basic principle of the SCR post-treatment technology is a nitrogen oxide purification method which utilizes ammonia gas decomposed from urea as a reducing agent, and the reducing agent selectively reacts with the nitrogen oxides in the tail gas under the action of a catalyst to generate nitrogen, carbon dioxide, water and the like.
With the upgrade of the emission of non-road diesel mobile machinery from state three to state four and the upcoming implementation of state four emission standards, in order to meet the emission requirements, the hydraulic excavator is provided with a diesel engine post-treatment system, the post-treatment system comprises a DPF and an SCR, and the DPF and SCR post-treatment system is called one of the main choices for removing particulate matters and nitrogen oxides of the state four hydraulic excavator. In order to improve the conversion efficiency of the SCR catalyst, high exhaust temperature is needed to achieve good aftertreatment purification effect and meet the requirements of emission standards, and the process of improving the exhaust temperature is called engine thermal management. In the actual operation process of the hydraulic excavator, working conditions with lower working load exist, and under the working conditions, the engine cannot reach the designed SCR catalyst conversion efficiency due to low exhaust temperature of the engine under the condition of low load, so that the engine is required to be subjected to heat management to improve the exhaust temperature and the SCR conversion efficiency and meet the requirements of emission regulations.
The existing engine aftertreatment heat management technology is mainly based on the design of an engine, an air inlet throttle valve is added in an air inlet system of the engine or an exhaust throttle valve is added in an exhaust system of the engine, namely, the existing SCR heat management mode mainly adopts the air inlet throttle valve or the exhaust throttle valve to carry out primary temperature raising, and the opening degree of the air inlet throttle valve or the exhaust throttle valve is correspondingly changed according to the temperature requirement of aftertreatment so as to achieve the purpose of raising the exhaust temperature. The temperature increase by changing the opening degree of the intake throttle valve or the exhaust throttle valve is to increase the exhaust gas temperature to a certain value, and this relatively low temperature may be called a primary temperature increase, which is generally 250 ℃. If higher exhaust temperatures are required, e.g. above 500 c, this is achieved by post-injection of fuel, which however needs to be done at a primary elevated temperature. The design is not based on the characteristics of an engine mounting platform, namely the technical characteristics of the whole engine. There are the following problems:
(1) for an engine adopting an air inlet throttle valve to realize heat management, the air inlet throttle valve can change the stability of air inlet flow, so that the power output of the engine fluctuates; the addition of the air inlet throttle valve makes the engine structure complex, increases cost, and makes the throttle valve frequently act, thus reducing system reliability.
(2) For an engine adopting an exhaust throttle valve to realize thermal management, due to the fact that exhaust pressure is large, abnormal sound can be generated due to flow changes caused by throttling, exhaust back pressure of the engine is increased, and power of the engine is reduced; the exhaust throttle valve is added, so that the structure of the engine is complex, the cost is increased, and the reliability is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a thermal management system and method for engineering machinery emission and engineering machinery.
In order to achieve the purpose, the invention provides the following technical scheme:
a thermal management system for engineering machinery emission comprises an engine, a hydraulic pump, a reversing valve and a working oil cylinder which are sequentially connected, wherein an aftertreatment device is arranged in the tail gas direction of the engine, the hydraulic pump is a variable pump, and the aftertreatment device is used for treating exhaust in an engine or diesel engine exhaust system; the device also comprises a complete machine controller, a control unit, a pressure sensor and a pressure regulating valve; the pressure sensor is arranged at the outlet of the hydraulic pump or between the hydraulic pump and the reversing valve, and is used for acquiring the pressure in the pipeline and transmitting the acquired pressure data to the complete machine controller; the whole machine controller is respectively electrically connected with the control unit, the pressure sensor, the hydraulic pump and the pressure regulating valve and is used for receiving an inlet temperature and engine speed signal of the post-processing device transmitted by the control unit and a pressure signal of a hydraulic system transmitted by the pressure regulating valve, judging whether thermal management is needed according to the received signals, and controlling the hydraulic pump and the pressure regulating valve to act according to internal calculation results when the thermal management is needed; the control unit is respectively electrically connected with the post-processing device, the engine and the whole machine controller, and is used for acquiring an inlet temperature signal and an engine rotating speed signal of the post-processing device and transmitting the acquired signals to the whole machine controller; the pressure regulating valve is used for regulating the pressure of a hydraulic system according to a control signal sent by a complete machine controller, and is independently arranged in a hydraulic loop or integrally arranged with a reversing valve.
With reference to the first aspect, further, the aftertreatment device includes a selective catalytic reduction device SCR.
With reference to the first aspect, further, a temperature sensor is disposed at an inlet of the SCR, and the temperature sensor is configured to collect an exhaust temperature at the inlet of the SCR and transmit collected temperature data to the control unit.
With reference to the first aspect, further, a rotation speed sensor is arranged on the engine, and the rotation speed sensor is used for acquiring the rotation speed of the engine and transmitting the rotation speed data to the control unit.
With reference to the first aspect, the aftertreatment device further includes an oxidation catalytic converter DOC and a diesel particulate filter DPF, and the oxidation catalytic converter DOC, the diesel particulate filter DPF, and the selective catalytic reduction device SCR are sequentially disposed.
With reference to the first aspect, the overall controller further includes an SCR thermal management control module, an exhaust temperature MAP is preset in the SCR thermal management control module, an abscissa of the exhaust temperature MAP is engine speed, and an ordinate of the exhaust temperature MAP is engine output torque, and a different engine output torque value at each engine speed corresponds to one exhaust temperature. In the MAP, the engine speed is also the speed of the hydraulic pump, and the output torque of the engine corresponds to the absorption torque of the hydraulic pump.
With reference to the first aspect, further, the input signals are from a control unit, and include engine speed and SCR inlet temperature, and the input signals CAN be sent through a CAN bus.
With reference to the first aspect, further, the hydraulic pump is a plunger type variable displacement pump, and is directly connected to the engine to absorb power of the engine; the displacement of the hydraulic pump is controlled by the angle of the swash plate, which is determined by the displacement of the plunger, which is ultimately determined by the opening of the proportional solenoid valve.
In a second aspect, a method for heat management of engineering machinery exhaust is based on the heat management system, and includes the following steps:
step 1, a complete machine controller receives an SCR inlet temperature signal T0 and an engine speed signal n from a control unit;
step 3, comparing, if T0 is less than TL, starting SCR thermal management, sending a first control signal and a second control signal by an SCR thermal management control module after internal calculation processing, sending the first control signal to a pressure regulating valve to instruct the pressure regulating valve to regulate the pressure of a hydraulic system, sending the second control signal to a proportional solenoid valve to instruct the proportional solenoid valve to regulate the discharge capacity of the hydraulic pump, increasing the pressure of the hydraulic system at the moment, increasing the absorption power of the hydraulic pump, increasing the engine load, and increasing the exhaust temperature; continuously carrying out iterative calculation until the power H of the hydraulic pump is equal to the target power PH, stopping iteration, setting the displacement of the pump to be a current value, and keeping the displacement unchanged;
step 4, comparing, if TO < TH, maintaining the current situation, not performing regulation work, and TH is the set temperature for SCR thermal management quitting;
and 5, comparing, if TO is larger than TH, restoring the displacement of the hydraulic pump TO the set displacement before thermal management, and setting the pressure regulating valve TO be fully open TO exit the thermal management.
With reference to the second aspect, further, the internal calculation method of the SCR thermal management control module in step 3 specifically includes:
step 3-1, directly checking a torque value corresponding to the set temperature TH of the SCR thermal management exit from an MAP by the SCR thermal management control module according to the current engine speed;
step 3-2, calculating engine power PH required by reaching the set temperature TH according to the torque value corresponding to the inquired set temperature TH and a formula P = M n/9550 (wherein P is engine power, M is engine output torque, n is engine rotating speed, and the formula belongs to the theorem), and the engine power PH is target power required by the hydraulic system to be increased;
3-3, calculating a formula H = K q y (wherein H is the power of the hydraulic system, q is the displacement of the hydraulic pump, y is the pressure of the hydraulic system, K is a constant, and the formula belongs to the theorem) according to the pressure y of the hydraulic system collected by the pressure sensor and the absorbed power of the hydraulic pump, and calculating the displacement q of the pump under the current pressure of the hydraulic system;
and 3-4, continuously repeating the step 3-1 to the step 3-3 for iterative calculation until the power H of the hydraulic pump is equal to the target power PH.
In a third aspect, a construction machine includes the above thermal management system.
Compared with the prior art, the invention provides a thermal management system and method for engineering machinery emission and engineering machinery, and the thermal management system and method have the following beneficial effects:
(1) the heat management system of the invention designs an SCR heat management mode of the engine post-treatment based on the whole machine, cancels an air inlet or exhaust throttle valve, and improves the load of the engine by improving the absorption power of a hydraulic system of the whole machine when heat management is needed, thereby improving the exhaust temperature;
(2) according to the heat management system, the hydraulic pump can change the displacement of the pump according to the post-treatment heat management requirement of the engine; the pressure of the hydraulic system can be changed and adjusted according to the heat management requirement of the aftertreatment of the engine; the pressure of the hydraulic system can be adjusted according to the exhaust temperature change; the pressure regulating valve on the unloading loop of the hydraulic system can change unloading pressure according to the control current signal; by varying the displacement of the hydraulic pump and the hydraulic system pressure, in conjunction with the hydraulic system power MAP, multi-level control of engine load may be achieved.
(3) The heat management system of the invention enables the power output of the engine to be more stable; the air inlet and exhaust systems of the engine are simplified, the design cost is reduced, and the system reliability is improved; the response speed of the whole machine action is improved; the exhaust back pressure of the engine is reduced, and the power of the engine is improved.
Drawings
FIG. 1 is a schematic diagram of a thermal management system of the present invention;
FIG. 2 is a logic diagram of SCR thermal management control in embodiment 1 of the present invention;
fig. 3 is a logic diagram of SCR thermal management control in embodiment 2 of the present invention.
The reference numerals in the figures have the meaning:
1-complete machine controller, 101-first control signal, 102-second control signal, 103-input signal, 2-engine, 201-post-processing device, 3-hydraulic pump, 4-plunger, 5-proportional electromagnetic valve, 6-reversing valve, 7-working oil cylinder, 8-pressure regulating valve, 9-pressure sensor, 10-control unit, 11-temperature sensor and 12-rotating speed sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may also include different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the claimed invention.
Example 1
As shown in fig. 1, the thermal management system of the present invention includes an engine 2, a hydraulic pump 3, a reversing valve 6 and a working cylinder 7 which are connected in sequence, wherein an after-treatment device 201 is arranged in a tail gas direction of the engine 2, the hydraulic pump 3 is a variable displacement pump, and the after-treatment device 201 is used for treating exhaust gas in the engine 2 or a diesel engine exhaust system; the device also comprises a complete machine controller 1, a control unit 10, a pressure sensor 9 and a pressure regulating valve 8; the pressure sensor 9 is arranged at the outlet of the hydraulic pump 3 or between the hydraulic pump 3 and the reversing valve 6 and used for acquiring the pressure in a pipeline and transmitting the acquired pressure data to the complete machine controller 1; the whole machine controller 1 is respectively electrically connected with the control unit 10, the pressure sensor 9, the hydraulic pump 3 and the pressure regulating valve 8, and is used for receiving the inlet temperature of the post-processing device 201 and the rotating speed signal of the engine 2 transmitted by the control unit 10 and the pressure signal of the hydraulic system transmitted by the pressure regulating valve 8, judging whether thermal management is needed according to the received signals, and controlling the hydraulic pump 3 and the pressure regulating valve 8 to act according to internal calculation results when the thermal management is needed; the control unit 10 is electrically connected with the post-processing device 201, the engine 2 and the complete machine controller 1 respectively, and is used for acquiring an inlet temperature signal of the post-processing device 201 and a rotating speed signal of the engine 2 and transmitting the acquired signals to the complete machine controller 1; the pressure regulating valve 8 is used for regulating the pressure of a hydraulic system according to a control signal sent by the complete machine controller 1, and is independently arranged in a hydraulic circuit or is integrally arranged with the reversing valve 6.
In one embodiment of this embodiment, aftertreatment device 201 includes a selective catalytic reduction device SCR.
In a specific embodiment of the present embodiment, the position of the pressure regulating valve 8 in the hydraulic circuit may be after the direction valve 6, or may be at position a or position B in fig. 1.
In one embodiment of the present embodiment, the pressure regulating valve 8 is realized by regulating the flow area of the valve, but other embodiments are also possible.
In a specific embodiment of the present embodiment, the inlet of the selective catalytic reduction device SCR is provided with a temperature sensor 11, and the temperature sensor 11 is configured to collect the exhaust gas temperature at the inlet of the selective catalytic reduction device SCR and transmit the collected temperature data to the control unit 10.
In a specific embodiment of the present embodiment, a rotation speed sensor 12 is disposed on the engine 2, and the rotation speed sensor 12 is configured to acquire a rotation speed of the engine 2 and transmit rotation speed data to the control unit 10.
In a specific embodiment of this embodiment, the aftertreatment device 201 further comprises an oxidation catalytic converter DOC and a diesel particulate filter DPF, which are arranged in sequence.
In a specific implementation manner of this embodiment, the complete machine controller 1 (VCU for short) includes an SCR thermal management control module, an exhaust temperature MAP is preset in the SCR thermal management control module, an abscissa of the exhaust temperature MAP is a rotation speed of the engine 2, and an ordinate of the exhaust temperature MAP is an output torque of the engine 2, and a different output torque value of the engine 2 at each rotation speed of the engine 2 corresponds to an exhaust temperature. In the MAP, the engine 2 rotation speed is also the rotation speed of the hydraulic pump 3, and the output torque of the engine 2 corresponds to the absorption torque of the hydraulic pump 3.
In a specific implementation manner of the embodiment, the input signal 103 is from a control unit 10 (the control unit 10 is abbreviated as ECU), and includes the rotation speed of the engine 2 and the SCR inlet temperature, and the input signal 103 CAN be sent through a CAN bus.
In a specific implementation manner of this embodiment, the hydraulic pump 3 is a plunger 4 type variable displacement pump, and is directly connected to the engine 2 to absorb the power of the engine 2; the displacement of the hydraulic pump 3 is controlled by the swash plate angle determined by the displacement of the plunger 4, and the displacement of the plunger 4 is finally determined by the opening degree of the proportional solenoid valve 5.
As shown in fig. 2, the present invention also discloses a thermal management method, which comprises the following steps:
step 1, the complete machine controller 1 receives an SCR inlet temperature signal T0 and an engine 2 rotating speed signal n from a control unit 10;
step 3, after comparison, if T0 is less than TL, SCR thermal management is started, the SCR thermal management control module sends a first control signal 101 and a second control signal 102 after internal calculation processing, the first control signal 101 is sent to the pressure regulating valve 8 to instruct the pressure regulating valve 8 to regulate the pressure of the hydraulic system, the second control signal 102 is sent to the proportional solenoid valve 5 to instruct the proportional solenoid valve 5 to regulate the displacement of the hydraulic pump 3 to increase the displacement of the hydraulic pump 3, and at this time, the pressure of the hydraulic system is increased, the absorption power of the hydraulic pump 3 is increased, the engine load is increased, and the exhaust temperature is increased; continuously carrying out iterative calculation until the power H of the hydraulic pump 3 is equal to the target power PH, stopping iteration, setting the displacement of the pump as a current value, and keeping the displacement unchanged;
step 4, comparing, if TO < TH, maintaining the current situation, not performing regulation work, and TH is the set temperature for SCR thermal management quitting;
and 5, comparing, if the TO is larger than the TH, restoring the displacement of the hydraulic pump 3 TO the set displacement before the thermal management, and setting the pressure regulating valve 8 TO be fully open TO exit the thermal management.
When thermal management is needed, the flow area of the pressure regulating valve 8 can be gradually reduced to gradually increase the pressure of the hydraulic system, at this time, the absorption power of the hydraulic pump 3 is increased due to the increase of the discharge pressure of the hydraulic system, and if the absorption power H of the hydraulic pump 3 reaches the target power PH requirement of the engine 2 or the exhaust temperature T0 is increased above the SCR thermal management starting point set temperature TL, at this time, the power of the engine 2 can be increased only by the increase of the pressure of the hydraulic system without changing the displacement of the hydraulic pump 33, so as to increase the exhaust temperature; if the flow area of the pressure regulating valve 8 has reached the limit position, the power of the engine 2 has not yet reached the target power PH or the exhaust temperature T0 is lower than the SCR thermal management starting point set temperature TL, and the displacement of the hydraulic pump 33 is increased to increase the load of the engine 2, so as to raise the temperature. When the exhaust temperature T0 is higher than the set temperature TH, the displacement of the hydraulic pump 3 is returned to the set displacement before the temperature is raised, the pressure regulating valve 8 operates at the full-flow position, and the thermal management is stopped.
The invention also discloses engineering machinery, the engineering machinery is provided with the heat management system, and when heat management is needed, the load of the engine 2 is increased by increasing the absorption power of the hydraulic system of the whole machine, so that the exhaust temperature is increased.
Example 2
Example 2 differs from example 1 in that: the thermal management methods of the invention are slightly different, the embodiment directly increases the pressure of the hydraulic system and the displacement of the hydraulic pump 3 at the same time, improves the thermal management rate, and reduces the iterative calculation process of the SCR control management module, and the method specifically comprises the following steps:
as shown in fig. 3, when thermal management is required, the flow area of the pressure regulating valve 8 may be reduced to gradually increase the pressure in the hydraulic system, the displacement of the hydraulic pump 3 may be increased to rapidly increase the absorbed power of the hydraulic pump 3, and when the exhaust temperature T0 is higher than the set temperature TH, the displacement of the hydraulic pump 3 may be returned to the set displacement before the temperature rise, the pressure regulating valve 8 may be operated at the full flow position, and thermal management may be stopped.
It should be noted that, in the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order between such entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A thermal management system for engineering machinery exhaust is characterized in that: the device comprises an engine, a hydraulic pump, a reversing valve and a working oil cylinder which are sequentially connected, wherein a post-treatment device is arranged in the tail gas direction of the engine, the hydraulic pump is a variable pump, and the post-treatment device is used for treating exhaust in an exhaust system of the engine or the diesel engine; the device also comprises a complete machine controller, a control unit, a pressure sensor and a pressure regulating valve; the pressure sensor is arranged at the outlet of the hydraulic pump or between the hydraulic pump and the reversing valve, and is used for acquiring the pressure in the pipeline and transmitting the acquired pressure data to the complete machine controller; the whole machine controller is respectively electrically connected with the control unit, the pressure sensor, the hydraulic pump and the pressure regulating valve, and is used for receiving an inlet temperature and engine speed signal of the post-processing device transmitted by the control unit and a pressure signal of a hydraulic system transmitted by the pressure regulating valve, judging whether thermal management is needed according to the received signals, and controlling the hydraulic pump and the pressure regulating valve to act according to internal calculation results when the thermal management is needed; the control unit is respectively electrically connected with the post-processing device, the engine and the whole machine controller, and is used for acquiring an inlet temperature signal and an engine rotating speed signal of the post-processing device and transmitting the acquired signals to the whole machine controller; the pressure regulating valve is used for regulating the pressure of a hydraulic system according to a control signal sent by a complete machine controller, and is independently arranged in a hydraulic loop or integrally arranged with a reversing valve.
2. The exhaust heat management system of the engineering machine according to claim 1, wherein: the aftertreatment device includes a selective catalytic reduction device SCR.
3. The exhaust heat management system of the engineering machine according to claim 2, wherein: the inlet of the selective catalytic reduction device SCR is provided with a temperature sensor, and the temperature sensor is used for collecting the exhaust temperature at the inlet of the selective catalytic reduction device SCR and transmitting the collected temperature data to the control unit.
4. The exhaust heat management system of the engineering machine according to claim 1, wherein: the engine is provided with a rotating speed sensor, and the rotating speed sensor is used for collecting the rotating speed of the engine and transmitting rotating speed data to the control unit.
5. The exhaust heat management system of the engineering machine according to claim 2, wherein: the aftertreatment device further comprises an oxidation type catalytic converter (DOC) and a Diesel Particle Filter (DPF), and the oxidation type catalytic converter (DOC), the Diesel Particle Filter (DPF) and the selective catalytic reduction device (SCR) are sequentially arranged.
6. The exhaust heat management system of the engineering machine according to claim 2, wherein: the whole machine controller comprises an SCR thermal management control module, an exhaust temperature MAP is preset in the SCR thermal management control module, the abscissa of the exhaust temperature MAP is engine speed, the ordinate of the exhaust temperature MAP is engine output torque, and different engine output torque values at each engine speed correspond to one exhaust temperature.
7. A heat management method for engineering machinery exhaust is characterized by comprising the following steps: the method comprises the following steps:
step 1, a complete machine controller receives an SCR inlet temperature signal T0 and an engine speed signal n from a control unit;
step 2, the SCR thermal management control module compares the received SCR inlet temperature signal T0 with the SCR thermal management starting point set temperature TL;
step 3, comparing, if T0 is less than TL, starting SCR thermal management, sending a first control signal and a second control signal by an SCR thermal management control module after internal calculation processing, sending the first control signal to a pressure regulating valve to instruct the pressure regulating valve to regulate the pressure of a hydraulic system, sending the second control signal to a proportional solenoid valve to instruct the proportional solenoid valve to regulate the discharge capacity of the hydraulic pump, increasing the pressure of the hydraulic system at the moment, increasing the absorption power of the hydraulic pump, increasing the engine load, and increasing the exhaust temperature; continuously carrying out iterative calculation until the power H of the hydraulic pump is equal to the target power PH, stopping iteration, setting the displacement of the pump to be a current value, and keeping the displacement unchanged;
step 4, comparing, if TO < TH, maintaining the current situation, not performing regulation work, and TH is the set temperature for SCR thermal management quitting;
and 5, comparing, if TO is larger than TH, restoring the displacement of the hydraulic pump TO the set displacement before thermal management, and setting the pressure regulating valve TO be fully open TO exit the thermal management.
8. The method for managing the heat of the exhaust of the engineering machinery according to claim 7, wherein the method comprises the following steps: the internal calculation method of the SCR thermal management control module in step 3 specifically includes:
step 3-1, directly checking a torque value corresponding to the set temperature TH of the SCR thermal management exit from an MAP by the SCR thermal management control module according to the current engine speed;
step 3-2, calculating the engine power PH required by reaching the set temperature TH according to the inquired torque value corresponding to the set temperature TH, wherein the engine power PH is the target power to which the hydraulic system needs to be increased;
3-3, calculating the pump displacement q under the current hydraulic system pressure according to the hydraulic system pressure y acquired by the pressure sensor;
and 3-4, continuously repeating the step 3-1 to the step 3-3 for iterative calculation until the power H of the hydraulic pump is equal to the target power PH.
9. A construction machine characterized in that: comprising a thermal management system according to any of claims 1 to 6.
10. A construction machine characterized in that: the method for managing heat of the exhaust of the engineering machinery is adopted for managing heat of the exhaust of the engineering machinery.
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