Hybrid mixer truck post-processing heat management method and device, hybrid mixer truck and medium

Abstract

The application relates to a hybrid mixer rear treatment heat management method and device, a hybrid mixer and a medium in the technical field of vehicles. The hybrid mixer rear treatment heat management method comprises the following steps: acquiring an upstream temperature of an engine rear treatment system; determining whether the hybrid mixer is in a preset working condition based on the upstream temperature; and when the hybrid mixer is in the preset working condition, switching the operation of a mixer tank body of the hybrid mixer from engine driving to motor driving. The hybrid mixer rear treatment heat management method can reduce oil consumption and emission pollution caused by long-time idling operation of the engine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a hybrid mixer rear treatment thermal management method and device, a hybrid mixer and a medium. BACKGROUND

[0002] With the increasing demand for mixer application in the field of infrastructure development, the requirements for mixer development in terms of economy, reliability and emission regulations are becoming more and more stringent; the most commonly used in the current mixer market is still based on traditional diesel engine as the power system, and the engine runs at idle speed for a long time during the waiting for loading and unloading stage, which on the one hand is easy to cause negative pressure in the engine cylinder, and the oil enters the combustion chamber to increase the oil consumption; on the other hand, the idle speed operation load is low, and the rear treatment exhaust temperature is low, which brings emission problems. SUMMARY

[0003] In view of the problems in the background art, the present application provides a hybrid mixer rear treatment thermal management method and device, a hybrid mixer and a storage medium, which can reduce the oil consumption and emission pollution caused by long-time idle running of the engine.

[0004] According to a first aspect of the present application, a hybrid mixer rear treatment thermal management method is provided, comprising: obtaining an upstream temperature of an engine rear treatment system; determining that the hybrid mixer is in a preset working condition based on the upstream temperature, and switching the operation of a mixing tank body of the hybrid mixer from engine driving to motor driving when the hybrid mixer is in the preset working condition.

[0005] In some embodiments of the present application, when the hybrid mixer is in the preset working condition, a prompt instruction is reported, and the motor driving is actively switched based on the prompt instruction, and the engine is actively turned off after the motor driving is switched.

[0006] In some embodiments of the present application, when the hybrid mixer is in the preset working condition, a prompt instruction is reported, and at the same time, a collection time is started, and when the length of the collection time reaches a set length and any control operation is not actively completed, the motor driving is automatically switched.

[0007] In some embodiments of the present application, the set length is 3-10 min.

[0008] In some embodiments of the present application, after the mixing tank body is automatically switched to motor driving, the engine is automatically turned off.

[0009] In some embodiments of the present application, determining that the hybrid mixer is in a preset working condition based on the upstream temperature comprises:

[0010] Obtaining a urea start spraying temperature and a easy crystallization temperature of the engine rear treatment system.

[0011] limit value of the upstream temperature is set based on the urea onset temperature and the easy crystallization temperature;

[0012] When the upstream temperature is lower than the limit value, the hybrid mixer truck is in a preset working condition.

[0013] In some embodiments of the present application, when the upstream temperature is greater than or equal to the limit value, the operation of the mixing tank body of the hybrid mixer truck is automatically maintained as engine driving.

[0014] According to a second aspect of the present application, a hybrid mixer truck aftertreatment thermal management device is provided, comprising:

[0015] an upstream temperature determination module configured to perform collecting an upstream temperature of an engine aftertreatment system;

[0016] a preset working condition determination module configured to determine whether the hybrid mixer truck is in a preset working condition based on the upstream temperature;

[0017] a thermal management control module configured to switch the operation of the mixing tank body of the hybrid mixer truck from engine driving to motor driving based on whether the hybrid mixer truck is in the preset working condition.

[0018] According to a third aspect of the present application, a hybrid mixer truck is provided, comprising at least one processor and a memory;

[0019] the memory stores computer-executable instructions;

[0020] the at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the hybrid mixer truck aftertreatment thermal management method described above.

[0021] According to a fourth aspect of the present application, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium stores computer-executable instructions, and when a processor executes the computer-executable instructions, the hybrid mixer truck aftertreatment thermal management method described above is implemented.

[0022] The embodiment of the application provides a hybrid mixer truck aftertreatment thermal management method, which uses an upstream temperature signal of an aftertreatment system as a signal of parallel driving of a motor and an engine, takes the upstream temperature of SCR as an ECU signal input source, sets a limit value of the signal source according to a urea starting temperature and a crystallization temperature of SCR, and automatically judges after the ECU receives the upstream temperature of SCR. If the upstream temperature of SCR is lower than the set limit value, a prompt instruction is sent, and the user can actively select to switch the motor direct drive. When the adjustment cannot be made in time, the motor direct drive is passively switched after a set time duration, the engine is automatically turned off, the motor directly provides power for the mixing tank body, the operation of the mixing tank body in the long-time waiting process of the mixer truck for loading and unloading is maintained, the engine idle speed low load long-time operation is avoided, and thus the engine cylinder negative pressure caused oil consumption problem and the emission problem caused by low exhaust temperature of the aftertreatment under the idle speed low load working condition are solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0024] Figure 1 FIG. 1 is a structural schematic diagram of an aftertreatment system of the embodiment of the application;

[0025] Figure 2 FIG. 5 is a flowchart of the hybrid mixer truck aftertreatment thermal management method provided by the embodiment of the application;

[0026] Figure 3 FIG. 6 is a schematic diagram of the hybrid mixer truck aftertreatment thermal management device provided by the application.

[0027] The various reference signs in the drawings represent the following:

[0028] 100, SCR tank; 101, upstream temperature sensor; 102, downstream temperature sensor; 103, exhaust pipe; 104, urea injection device; 105, engine;

[0029] 200, thermal management device; 201, upstream temperature determination module; 202, preset working condition determination module; 203, timing module; 204, time duration determination module; 205, thermal management control module. DETAILED DESCRIPTION

[0030] It should be noted that the described embodiments are merely some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0031] The following description refers to the accompanying drawings. Unless otherwise indicated, same numbers in different drawings indicate same or similar elements. The following description of the example embodiments is not representative of all possible embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0032] In the description of the present application, it should be understood that the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" means two or more. "And / or", which describes the association between objects, means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.

[0033] The hybrid mixer truck aftertreatment thermal management method and device, hybrid mixer truck and medium provided by the embodiments of the present application are described below in conjunction with the drawings.

[0034] The present application discloses a hybrid mixer truck aftertreatment thermal management method, which is applied to a motor and engine combined hybrid mixer truck. The engine of the hybrid mixer truck drives the mixing tank body to run through a rear power take-off output transmission structure or drives the mixing tank body to run through a motor direct drive method.

[0035] For a traditional diesel mixer truck or a hybrid mixer truck of the present application, the engine aftertreatment system includes a diesel oxidation catalytic converter (DOC), a diesel particulate filter (DPF) and a selective catalytic reducer (SCR), as shown in Figure 1As shown, the engine 105 combustion exhaust gas is discharged after the DOC (not shown), DPF (not shown) treatment, and then transported to the SCR through the exhaust pipe 103 for treatment, and then discharged, the selective catalytic reducer (SCR) includes the SCR box 100, the upstream temperature sensor 101 installed on the upstream side of the SCR box 100, the downstream temperature sensor 102 installed on the exhaust end of the SCR box 100, and the urea injection device 104 installed on the exhaust pipe 103 close to the upstream side of the SCR box 100; the upstream temperature sensor 101 of the SCR monitors the temperature upstream of the SCR box 100, and the downstream temperature sensor 102 monitors the temperature downstream of the SCR box 100, and the engine speed, torque and the upstream temperature of the SCR box 100 have a strong correlation.

[0036] When the operation of the mixing tank body of the mixer truck is driven by the engine 105, during the waiting stage of loading or unloading of the mixer truck, the engine 105 will run for a long time at idle speed, which is easy to cause negative pressure in the cylinder of the engine 105, oil enters the combustion chamber to increase oil consumption, and accelerate the carbon deposition of the piston ring bank, affecting the service life of the engine 105 parts; and under the condition of long-time low-speed and low-load operation, the SCR temperature is too low, which causes insufficient urea injection, and at the same time affects the conversion efficiency of the SCR catalyst, at this time most of the NOx in the engine exhaust will be directly discharged into the atmosphere to cause pollution.

[0037] Figure 2 The flow chart of the hybrid mixer truck aftertreatment thermal management method provided by the embodiment of the application, the execution subject of the hybrid mixer truck aftertreatment thermal management method can be an electronic control unit ECU. As shown in the embodiment of the application, Figure 2 The hybrid mixer truck aftertreatment thermal management method of the embodiment includes the following steps:

[0038] S1, obtain the limit value of the upstream temperature of the engine aftertreatment system.

[0039] S11, first, obtain the urea injection temperature of the SCR.

[0040] At normal temperature, urea cannot react with NOx in the exhaust gas, and generally needs to be injected at about 200℃ to ensure a high conversion rate of urea, and the urea injection temperature can be set by each manufacturer, such as setting the urea injection temperature to 250℃, 270℃, 300℃, etc., that is, when the urea injection temperature is set to 300℃, the SCR reaches 300℃, the urea injection device 104 sprays urea, and the SCR starts to work.

[0041] In actual application, the urea injection temperature is tested in the laboratory, and the best urea injection temperature is obtained in combination with the speed, torque and other information of the engine 105.

[0042] S12, then set the limit value of the upstream temperature of the engine aftertreatment system according to the urea start-up temperature setting.

[0043] In addition, according to the requirements of the user and the application platform and application environment of the product, the limit value of the upstream temperature of the engine aftertreatment system can also be a limit value specified by the customer for the realization of customized products to meet the different needs of customers.

[0044] It should be noted that when setting the limit value of the upstream temperature of the engine aftertreatment system, other factors that will affect the operation of the SCR, such as the crystallization temperature of the SCR, can also be considered.

[0045] S2, determine whether the hybrid mixer truck is in a preset working condition.

[0046] S21, first, set the hybrid mixer truck to be in a preset working condition when the upstream temperature of the SCR tank 100 is lower than the limit value of the upstream temperature of the engine aftertreatment system, and the hybrid mixer truck is not in a preset working condition when the upstream temperature of the SCR tank 100 is greater than or equal to the limit value of the upstream temperature of the engine aftertreatment system.

[0047] S21, secondly, obtain the upstream temperature of the engine aftertreatment system, which can be collected by the upstream temperature sensor 101.

[0048] When the obtained upstream temperature of the SCR tank 100 is lower than the limit value of the upstream temperature of the engine aftertreatment system, it can be determined that the hybrid mixer truck is in a preset working condition, and when the obtained upstream temperature of the SCR tank 100 is greater than or equal to the limit value of the upstream temperature of the engine aftertreatment system, it can be determined that the hybrid mixer truck is not in a preset working condition.

[0049] In addition, it should be noted that the upstream temperature of the diesel oxidation catalyst conversion device (DOC) can also be obtained, and the upstream temperature of the DOC can be compared with the limit value of the upstream temperature of the engine aftertreatment system to determine whether the hybrid mixer truck is in a preset working condition. The upstream temperature of the DOC and the upstream temperature of the SCR tank 100 can play the same role, and can be used as the upstream temperature of the engine aftertreatment system for comparison with the limit value of the upstream temperature of the engine aftertreatment system.

[0050] S3, determine the operation mode based on whether the hybrid mixer truck is in a preset working condition.

[0051] S31, when it is determined that the hybrid mixer truck is in a preset working condition, the operation of the mixing tank body of the hybrid mixer truck is switched from engine drive to motor drive.

[0052] Specifically, the operation of the mixing tank body is switched from engine drive to motor drive in two modes, one is active switching, and the other is passive (automatic) switching.

[0053] In the embodiment, the specific operation mode of active switching is that when the hybrid mixer truck is in the preset working condition, a prompt instruction, for example, a sound or light prompt instruction, is given, and based on the prompt instruction, the user can actively switch to motor driving, and after switching to motor driving, the engine is actively turned off.

[0054] In the embodiment, the specific operation mode of passive switching is that when the hybrid mixer truck is in the preset working condition, a prompt instruction is given, and at the same time, the time is started to be collected, and when it is judged that the time length of the collected time reaches the set time length T and any active control operation is not actively completed, the motor driving is automatically switched, and the engine is automatically turned off. The set time length T can be any time length greater than 0, and specifically, considering the reaction time of the user, the set time length T in the embodiment is preferably 3-10 min, for example, the set time length T is 5 min, 7 min, 9 min, etc.

[0055] Using the upstream temperature signal of the aftertreatment system as the signal of parallel driving of the motor and the engine, when the engine idles for a long time under low load, the upstream temperature of the SCR is lower than the set limit, the motor direct driving operation mode is actively or automatically switched, and the engine is replaced to work, so that the problems of oil consumption caused by negative pressure in the engine cylinder and the emission problems caused by low temperature of the aftertreatment SCR under the low load idle condition are solved, and the oil consumption and emission pollution caused by long-time idle running of the engine are reduced.

[0056] In addition, in actual application, according to the needs of the running condition of the mixing tank body, when the hybrid mixer truck is in the preset working condition and the prompt instruction is given, the user can actively keep the engine driving within the time before reaching the set time length T instead of switching to motor driving, so as to ensure that the running intensity of the mixing tank body meets the specific requirements, such as higher power requirements or the output electric energy of the motor needs to be reserved.

[0057] S32, when it is determined that the hybrid mixer truck is not in the preset working condition, it can be considered that the temperature of the aftertreatment system can ensure that the urea has a high conversion rate, and the high temperature of the aftertreatment system will not easily crystallize and block the exhaust pipe, at this time, the running of the mixing tank body of the hybrid mixer truck will be automatically kept as engine driving, without completing any active or passive switching.

[0058] The embodiment of the application also provides a hybrid mixer truck aftertreatment thermal management device, which corresponds to the method embodiment, and uses the hybrid mixer truck aftertreatment thermal management method to switch the motor driving mode and the engine driving mode of the mixing tank body of the hybrid mixer truck, Figure 3 The schematic diagram of the hybrid mixer truck aftertreatment thermal management device provided by the application is shown in FIG. 1. Figure 3As shown, the thermal management device 200 includes:

[0059] An upstream temperature determination module 201 is configured to determine an upstream temperature of the engine aftertreatment system.

[0060] A preset working condition determination module 202 is configured to determine whether the hybrid mixer truck is in a preset working condition based on the upstream temperature.

[0061] A timing module 203 is configured to start timing when the hybrid mixer truck is in the preset working condition.

[0062] A time length determination module 204 is configured to determine whether a time length of the hybrid mixer truck in the preset working condition reaches a set time length T based on the timing.

[0063] A thermal management control module 205 is configured to determine that the hybrid mixer truck is in the preset working condition based on the upstream temperature, and switch the operation of the mixing tank of the hybrid mixer truck from engine driving to motor driving or keep the engine driving according to whether the hybrid mixer truck is in the preset working condition.

[0064] When the time length determination module 204 determines that the time length of the timing reaches the set time length T and no active control operation is completed, the time length determination module 204 feeds back to the thermal management control module 205, and the thermal management control module 205 automatically switches to motor driving and controls the engine to automatically shut down.

[0065] The embodiment of the present application also provides a hybrid mixer truck, and the hybrid mixer truck comprises a processor and a memory; the memory is used for storing computer execution instructions; the processor is used for executing the computer execution instructions stored in the memory to realize each step executed by the ECU in the above-mentioned embodiment; and specific descriptions can be referred to the related descriptions in the above-mentioned method embodiment.

[0066] In a possible design, the memory can be independent or integrated with the processor.

[0067] When the memory is independently arranged, the hybrid mixer truck further comprises a bus used for connecting the memory and the processor.

[0068] The embodiment of the present application also provides a computer readable storage medium, and the computer readable storage medium stores computer execution instructions; when the processor executes the computer execution instructions, the hybrid mixer truck aftertreatment thermal management method is realized.

[0069] In several embodiments of the present application, it should be understood that the disclosed hybrid mixer truck and method can be implemented in other ways. For example, the above-described hybrid mixer truck embodiments are merely illustrative, for example, the division of modules is only a logical functional division, and actual implementation can have another division, for example, multiple modules can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed modules can be indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0070] The modules described as separate components can or can not be physically separated, and the components shown as modules can or can not be physical units, i.e., can be located in one place or can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0071] In addition, the functional modules in each embodiment of the present application can be integrated in one processing unit, or each module can be physically present separately, or two or more modules can be integrated in one unit. The unit formed by the above modules can be realized in the form of hardware or in the form of hardware plus software functional unit.

[0072] The integrated modules realized in the form of software functional modules can be stored in a computer readable storage medium. The software functional modules stored in a storage medium include a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute part of the steps of the method of each embodiment of the present application.

[0073] It should be understood that the above processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the present application can be directly embodied as hardware processor execution or combined with hardware and software modules in the processor for execution.

[0074] The memory can include a high-speed RAM memory, and can also include a non-volatile storage NVM, such as at least one disk memory, and can also be a U disk, a mobile hard disk, a read-only memory, a magnetic disk or an optical disk, etc.

[0075] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc.

[0076] The storage medium described above can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0077] An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium, and can write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an Application Specific Integrated Circuit (ASIC). Of course, the processor and the storage medium can also exist as discrete components in an electronic device or a host device.

[0078] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The foregoing program can be stored in a computer readable storage medium. The program executes to perform the steps of the above-mentioned method embodiments; and the foregoing storage medium includes ROM, RAM, magnetic disk or optical disk and various storage medium that can store program codes.

[0079] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hybrid mixer truck aftertreatment heat management method, characterized in that, The method comprises: acquiring an upstream temperature of an engine aftertreatment system; determining, based on the upstream temperature, that the hybrid mixer truck is in a preset working condition, when the hybrid mixer truck is in the preset working condition, issuing a prompt instruction, starting to collect time, actively switching the operation of the mixing tank of the hybrid mixer truck from engine driving to motor driving based on the prompt instruction, and actively shutting down the engine after switching to motor driving; or, when the length of the collected time is determined to reach a set length and no active control operation is completed, automatically switching the operation of the mixing tank of the hybrid mixer truck from engine driving to motor driving, and the engine is automatically turned off; determining, based on the upstream temperature, that the hybrid mixer truck is in a preset working condition comprises: acquiring a urea start spraying temperature and a easy crystallization temperature of the engine aftertreatment system; based on the urea start spraying temperature and the easy crystallization temperature, setting a limit value of the upstream temperature; when the upstream temperature is lower than the limit value, the hybrid mixer truck is in a preset working condition.

2. The hybrid mixer truck aftertreatment thermal management method of claim 1, wherein, The set length is 3-10 minutes.

3. The hybrid mixer truck aftertreatment thermal management method of claim 1, wherein, When the upstream temperature is greater than or equal to the limit value, the operation of the mixing tank of the hybrid mixer truck is automatically maintained as engine driving.

4. A hybrid mixer truck aftertreatment thermal management device for performing the hybrid mixer truck aftertreatment thermal management method of any one of claims 1 to 3, characterized in that, The method comprises: an upstream temperature determination module for acquiring an upstream temperature of an engine aftertreatment system; a preset working condition determination module for determining, based on the upstream temperature, whether the hybrid mixer truck is in a preset working condition; a timing module for starting to collect time when the hybrid mixer truck is in a preset working condition; a time length determination module for determining, based on the collected time, whether the length of time that the hybrid mixer truck is in a preset working condition reaches a set length; a thermal management control module for switching the operation of the mixing tank of the hybrid mixer truck from engine driving to motor driving or maintaining engine driving based on whether the hybrid mixer truck is in a preset working condition.

5. A hybrid mixer truck characterized by, The method comprises: at least one processor and a memory; the memory stores computer execution instructions; the at least one processor executes the computer execution instructions stored in the memory, so that the at least one processor executes the hybrid mixer truck aftertreatment thermal management method according to any one of claims 1-3.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer execution instructions, when the processor executes the computer execution instructions, the hybrid mixer truck aftertreatment thermal management method according to any one of claims 1-3 is realized.

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