CN103527294A - Postprocessing system control method, postprocessing electronic control unit and controller - Google Patents

Abstract

The invention discloses a postprocessing system control method, a postprocessing electronic control unit and a controller. The postprocessing system control method includes the steps of enabling the controller to receive a failure indication code sent by the postprocessing electronic control unit, enabling the controller to judge whether the received failure indication codes are equal to one of a plurality of pre-stored postprocessing system failure indication codes or not, enabling the different pre-stored failure indication codes to correspond to different alarm operations, recording the failure indication codes if the received failure indication codes are equal to one of the multiple pre-stored postprocessing system failure indication codes, and executing the corresponding alarm operations according to the failure indication codes. Rapid postprocessing system failure location is achieved, and the postprocessing system failure overhaul efficiency is improved.

Description

A control method of a post-processing system, a post-processing electronic control unit and a controller

technical field

The invention relates to the technical field of automatic control, in particular to a control method of an aftertreatment system, an aftertreatment electric control unit and a controller.

Background technique

As a kind of power machinery, diesel engine has made outstanding contributions to the development of society, but it also causes environmental pollution. With the increasingly stringent national regulations, the requirements for diesel engine emissions are getting higher and higher, and it is becoming more and more difficult to achieve emission compliance only by improving engine technology. In this case, the SCR (Selective Catalytic Reduction Technology) after-treatment system is introduced. The basic working principle of the SCR post-processing system is as follows:

The diesel engine exhaust flows out of the turbocharger turbine and enters the exhaust pipe. At the same time, the urea injection unit installed on the exhaust pipe sprays a certain amount of urea aqueous solution into the exhaust pipe in the form of mist. Under the action, hydrolysis and pyrolysis reactions occur, and the required reducing agent ammonia (NH ₃ ) is generated. Under the action of the catalyst, ammonia (NH ₃ ) selectively decomposes nitrogen oxides (NOx), the main harmful component in diesel engine exhaust. reduced to nitrogen (N ₂ ). Nitrogen is non-toxic and has no pollution to the environment.

The introduction of SCR post-processing system can reduce the pollution of diesel engine exhaust to the environment. At the same time, the introduction of an independent post-processing electronic control unit DCU is responsible for the control of the post-processing system and its fault diagnosis. When the post-processing system fails, the engine emission may exceed the standard. In view of this situation, the OBD (On-Board Diagnostic) requires that when the post-processing system fails, the DCU needs to light up or limit it according to the severity of the fault. Torque warning operation to remind the driver that the vehicle has broken down.

At present, the specific process of lighting the OBD light on the instrument panel of the vehicle after the after-processing failure occurs is shown in Figure 1 below, and the specific process of limiting the torque (limiting the engine torque) after the after-processing failure occurs is shown in Figure 2 below. The specific method is: when the post-processing system fails, after the judgment of the DCU, if the fault needs to be turned on, the DCU sets the bit7 of DM1DCUByte1 to 1 and bit8 to 0 in the DM1DCU message, indicating that the ECU (Electronic Control Unit, electronic control unit) to light the OBD light, and the ECU starts the torque limiting operation at idle speed after receiving the TSC1 torque limiting message request. When the post-processing system fails, after the judgment of the DCU, if the fault needs to start the torque limit, the DCU sends a torque limit request to the ECU through the TSC1 message, and the ECU starts the torque limit operation after receiving the torque limit request of the TSC1 message.

Contents of the invention

The inventor found through research that the fault management memory (DSM) of the ECU does not recognize TSC1 messages, so the fault management memory (DSM) does not record the faults of the post-processing system, and in actual operation, not only when the post-processing system fails It is necessary to perform torque limiting operation, for example, when the engine fails, the torque limiting operation also needs to be performed. Therefore, if the post-processing system fails and the torque limiting operation occurs, and the operator finds that the engine has not failed by checking the fault management memory (DSM) , the operator cannot immediately confirm that the aftertreatment system is faulty, resulting in a long time for fault confirmation and low maintenance efficiency.

In order to solve the above-mentioned technical problems, the embodiment of the present invention provides a control method of the post-processing system, a post-processing electronic control unit and a controller, so as to solve the technical problems of long confirmation time and low maintenance efficiency of the post-processing system. Provide technical solutions as follows:

A method for controlling an aftertreatment system, comprising:

The controller processes the fault indication code sent by the electronic control unit after receiving it;

The controller judges whether the received fault indication code is equal to one of a plurality of pre-stored post-processing system fault indication codes, and different pre-stored fault indication codes correspond to different alarm operations;

If the received fault indication code is equal to one of the multiple pre-stored fault indication codes of the post-processing system, the fault indication code is recorded, and a corresponding alarm operation is performed according to the fault indication code.

The present invention also provides a controller, including:

The receiving module is used to receive the fault indication code sent by the post-processing electronic control unit;

A judging module, configured to judge whether the received fault indication code is equal to one of a plurality of pre-stored post-processing system fault indication codes, and different pre-stored fault indication codes correspond to different alarm operations;

The recording module is used to record the fault indication code when the received fault indication code is equal to one of the pre-stored multiple post-processing system fault indication codes;

An execution module, configured to execute corresponding alarm operations according to the fault indication code.

The present invention also provides a control method of the post-processing system, including:

The post-processing electronic control unit monitors the running status of the post-processing system;

When the post-processing electronic control unit monitors that the post-processing system fails, it sends a fault indication code to the controller;

So that after the controller receives the fault code, it is judged whether the received fault indication code is equal to one of a plurality of pre-stored post-processing system fault indication codes, and different pre-stored fault indication codes correspond to different alarm operations; if the received The fault indication code is equal to one of the multiple pre-stored fault indication codes of the post-processing system, the fault indication code is recorded, and a corresponding alarm operation is performed according to the fault indication code.

The present invention also provides a post-processing electronic control unit, which is characterized in that it includes:

The monitoring module is used to monitor the operating status of the post-processing system;

The sending module is used for the post-processing electronic control unit to send the fault indication code to the controller when the post-processing system is faulty, so that the controller can judge whether the received fault indication code is consistent with the pre-stored multiple post-processing codes after receiving the fault code. One of the fault indication codes of the processing system is equal, and different pre-stored fault indication codes correspond to different alarm operations; if the received fault indication code is equal to one of the pre-stored multiple post-processing system fault indication codes, record the fault indication code, And perform corresponding alarm operation according to the fault indication code.

The present invention also provides a control system of an aftertreatment system, the system comprising:

The post-processing electronic control unit as described above, and the controller as described above.

It can be seen from the above technical solutions provided by the embodiments of the present invention that the fault indication code is pre-stored in the controller, and after receiving the fault indication code sent by the post-processing electronic control unit, the received fault indication code is compared with the pre-stored fault indication code , if the received fault indication code is equal to one of the pre-stored fault indication codes of the post-processing system, it indicates that the post-processing system has a fault, and the required alarm operation can be determined according to the fault indication code, and then the corresponding operation can be performed. According to the technical solution of the present invention, the fault indication code is pre-stored in the fault management memory (DSM). When it is determined that a fault occurs, the fault record can be recorded according to the fault indication code, which is convenient for the staff to check, and then determine the fault point in time, and Carry out maintenance of fault points to improve the efficiency of troubleshooting of post-processing systems.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in the present invention, and those skilled in the art can also obtain other drawings based on these drawings.

Fig. 1 is the specific process of lighting the OBD lamp after the post-processing failure occurs in the prior art;

Fig. 2 is the specific process of limiting the torque after the post-processing fault occurs in the prior art;

Fig. 3 is a flow chart of Embodiment 1 of a control method of a post-processing system provided by the present invention;

Fig. 4 is a flow chart of Embodiment 2 of a control method of a post-processing system provided by the present invention;

Fig. 5 is a flow chart of Embodiment 3 of a control method of a post-processing system provided by the present invention;

Fig. 6 is a signal block diagram corresponding to the technical solution of the present invention in an actual application scenario;

Fig. 7 is a schematic structural diagram of a controller provided by the present invention;

Fig. 8 is a schematic structural diagram of a post-processing electronic control unit provided by the present invention;

FIG. 9 is a schematic structural diagram of a control system of an aftertreatment system provided by the present invention.

Detailed ways

In the existing after-treatment system troubleshooting, when the after-treatment system fails and needs to be turned on and the torque is limited, the service personnel connect to the ECU through INCA (a kind of engine calibration software) to check the fault management memory (DSM) to determine the specific fault At this time, since the fault is not reported in the fault management system (DSM) of the ECU, the service personnel cannot immediately confirm that it is a fault in the post-processing system, resulting in low efficiency in fault elimination and fault repair. The control method of the post-processing system provided by the present invention, the post-processing electronic control unit and the controller can find out the fault point in time by setting the fault code, and then repair the fault point to improve the repair efficiency. In the following, a method for controlling an aftertreatment system provided by the present invention will firstly be introduced in detail.

The method includes:

The controller processes the fault indication code sent by the electronic control unit after receiving it;

The controller judges whether the received fault indication code is equal to one of a plurality of pre-stored post-processing system fault indication codes, and different pre-stored fault indication codes correspond to different alarm operations;

If the received fault indication code is equal to one of the multiple pre-stored fault indication codes of the post-processing system, the fault indication code is recorded, and a corresponding alarm operation is performed according to the fault indication code.

In the solution provided by the present invention, after receiving the fault indication code sent by the post-processing electronic control unit, the controller compares the received fault indication code with the pre-stored fault indication code, if the received fault indication code is more than the pre-stored If one of the two post-processing system fault indication codes is equal, it indicates that the post-processing system has a fault. According to the fault indication code, the alarm operation that needs to be performed can be determined, and then the corresponding operation is performed. According to the technical solution of the present invention, the fault indication code is pre-stored in the fault management memory (DSM). When it is determined that a fault occurs, the fault record can be recorded according to the fault indication code, which is convenient for the staff to check, and then determine the fault point in time, and Carry out maintenance of fault points to improve the efficiency of troubleshooting of post-processing systems.

In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention shall fall within the protection scope of the present invention.

Referring to Figure 1 below, it is a flow chart of Embodiment 1 of a control method for a post-processing system provided by the present invention. This embodiment may specifically include the following steps:

S301: The controller receives and processes the fault indication code sent by the electronic control unit.

Preferably, the fault indication code is sent in a post-processing fault diagnosis message DM1DCU. The fault indication code is used to indicate the alarm operation that needs to be performed, such as lighting operation or torque limiting operation. Preferably, corresponding fault indications can be set for the lighting and torque limiting operations required when the post-processing electronic control unit fails. The code indicates that the light and torque limit are aimed at the failure of the after-treatment system, which is convenient for the staff to identify.

S302: The controller judges whether the received fault indication code is equal to one of a plurality of pre-stored fault indication codes of the post-processing system, and if so, proceeds to step S303.

Pre-store multiple fault indication codes for the post-processing system in the controller, if the fault code sent by the post-processing system is equal to any one of the pre-stored fault codes, it means that the post-processing system has a fault, and then enter S303 .

S303: The controller records the fault indication code.

When it is determined that the post-processing system fails, the fault indication code is recorded. This is mainly for the purpose that when the post-processing system fails, the staff can check the fault record to determine what fault has occurred and the fault point where the fault occurred.

S304: The controller performs a corresponding alarm operation according to the fault indication code.

Because different fault indication codes correspond to different alarm operations required when the post-processing electronic control unit fails, when the after-processing system fails, corresponding alarm operations are performed according to the fault indication codes, such as lighting and/or torque limit.

In the technical solution of this embodiment, the fault indication code is pre-stored in the controller. After receiving the fault indication code sent by the post-processing electronic control unit, the received fault indication code is compared with the pre-stored fault indication code. If the received fault indication code is If the indicating code is equal to one of the pre-stored fault indicating codes of the post-processing system, it means that the post-processing system has a fault. According to the fault indicating code, the required alarm operation can be determined, and then the corresponding operation can be performed. According to the technical solution of the present invention, the fault indication code is pre-stored in the fault management memory (DSM). When it is determined that a fault occurs, the fault record can be recorded according to the fault indication code, which is convenient for the staff to check, and then determine the fault point in time, and Carry out maintenance of fault points to improve the efficiency of troubleshooting of post-processing systems.

Referring to FIG. 4 below, it is a flow chart of Embodiment 2 of a control method for a post-processing system provided by the present invention. This embodiment may specifically include the following steps:

S401: The post-processing electronic control unit monitors the running status of the post-processing system.

S402: When the post-processing ECU monitors that the post-processing system fails, it sends a fault indication code to the controller.

Preferably, the fault indication code is sent in a DM1DCU message.

Post-processing failures refer to system failures or component failures, such as broken temperature sensors and urea pumps. If the post-processing system fails, it may affect the engine emission. If the urea pump is broken and the urea cannot be injected normally, then the engine emission must exceed the standard. This type of failure can be said to be a serious failure. For example, sensor failure in the aftertreatment system does not affect urea injection, nor does it affect NOx emissions. According to the current national regulations on the NOx emission requirements of National IV engines less than 3.5g/(Kw.h), the emission index at this time is less than Therefore, this type of fault can be defined as a minor fault.

The severity of the aftertreatment system failure is based on whether it affects the engine emission as an index. According to whether the fault affects the engine emission, the fault is divided into grades, such as minor fault or serious fault, and then it is determined which fault indication code to send for which alarm operation. For example, if it is a minor fault, only the fault indication code corresponding to the light can be sent. After the controller receives the fault indication code, after determining the fault, it will perform the operation of only turning on the light to give an alarm.

Referring to FIG. 5 below, it is a flow chart of Embodiment 3 of a control method for a post-processing system provided by the present invention. This embodiment may specifically include the following steps:

S501: The post-processing electronic control unit monitors the running status of the post-processing system.

S502: When the post-processing electronic control unit detects a fault in the post-processing system, it sends a fault indication code to the controller.

S503: The controller receives and processes the fault indication code sent by the electronic control unit.

S504: The controller judges whether the received fault indication code is equal to one of a plurality of pre-stored fault indication codes of the post-processing system, and if so, enters step S505.

S505: The controller records the fault indication code.

S506: The controller performs a corresponding alarm operation.

Based on the description of the foregoing embodiments, refer to FIG. 6 , which is a signal block diagram corresponding to the technical solution of the present invention in an actual application scenario. The definitions of the parameter names refer to the examples in the above-mentioned embodiments. The post-processing electronic control unit DCU is mainly responsible for the fault diagnosis of the post-processing system. When the post-processing system fails, the DCU is responsible for identifying it. When the post-processing fault is not serious and does not affect engine emissions, the DCU judges that such faults are minor faults, and only needs to light up the OBD light, and does not need to perform torque limit operation; when the post-processing fault is serious, the fault may affect engine emissions When the DCU judges that the fault is a serious fault, it needs to turn on the OBD light and count down to 50 hours at the same time. After the timing is completed, the torque limit operation will be performed; The fault is a serious fault, and the OBD light needs to be turned on immediately, and the torque limit operation should be performed immediately. The 50 hours mentioned in it are set according to the OBD regulations. If the regulations change or the user needs to change this value, this value can be set separately.

After the DCU completes the post-processing fault identification, it sends the fault information to the ECU through the post-processing system fault indication message DM1DCU. When the post-processing system fault is a minor fault and only needs to light up the OBD light, the DCU sends the SPN code corresponding to the OBD light through the DM1DCU message. The SPN code here corresponds to the fault indication code described in the above-mentioned embodiment. Definition, in order to facilitate the description of the technical solution of the present invention, the SPN code corresponding to the OBD light is 3361 as an example for public explanation; when the post-processing fault is a 50-hour torque limit fault, the DCU first sends the SPN code through the DM1DCU message 3361, then, after the DCU completes the 50-hour timing, the DCU sends the SPN code corresponding to the torque limit through the DM1DCU message (the SPN code corresponding to the torque limit can also be customized by the user, using 4090 as an example for illustration); when the post-processing fault is When a serious fault requires immediate torque limitation, the DCU sends the SPN code 4090 through the DM1DCU message (the SPN code corresponding to the lighting may not be sent), and the lighting and torque limiting operations are performed at the same time.

After the ECU receives the message, it is responsible for analyzing the SPN code in the DM1DCU message. The analyzed SPN code enters the DSM for fault triggering. The analyzed SPN code is matched with the pre-stored SPN code, and the pre-stored SPN code for lighting It is recorded as Com_numDM1DCUSPN1_CA, and the SPN code corresponding to the torque limit is recorded as Com_numDM1DCUSPN2_CA. If the SPN code in the message is equal to the value marked in Com_numDM1DCUSPN1_CA or Com_numDM1DCUSPN2_CA, it will report DFC_ComDM1DCUSPN1 (indicating that the light needs to be turned on, and the form can be customized) or DFC_ComDM1DCUSPN2 ( Indicates the need to limit the torque, which can be customized) error. Referring to the above example, mark the Com_numDM1DCUSPN1_CA calibration value as 3361 and the Com_numDM1DCUSPN2_CA calibration value as 4090. When the SPN code of the DM1DCU message sent by the DCU contains 3361 or 4090, a corresponding error is reported, that is, DFC_ComDM1DCUSPN1 or DFC_ComDM1DCUSPN2.

If the fault of DFC_ComDM1DCUSPN1 is reported, DSM needs to calibrate the level of the fault to trigger the lighting operation; when the fault of DFC_ComDM1DCUSPN2 is reported, DSM not only needs to calibrate the level of the fault to trigger the lighting operation, but also calls the fault function limit calibration module (DINH) , the function function is called by the DINH module to perform torque limiting operation. The fault level mentioned here can be understood as the trigger signal that triggers the alarm operation. For example, if the level corresponding to the lighting operation is set to 1, when the DFC_ComDM1DCUSPN1 fault is reported, the lighting operation corresponding to level 1 will be triggered; if the lighting and If the torque limit operation is level 2, when the DFC_ComDM1DCUSPN2 fault is reported, the operation corresponding to level 2 will be triggered, which not only lights up but also limits the torque.

The DCU sends the SPN code to the ECU through the DM1DCU message, and the ECU analyzes it and sends it to the fault management system (DSM). The DSM can realize post-processing fault error reporting, and can light the OBD light and torque limit function. Whether to perform light and torque limit operations is determined by It is done by the ECU, and it is no longer necessary for the DCU to directly send instructions to turn on the OBD light and limit torque. At the same time, the fault management system (DSM) performs fault identification according to the received message information, and reports a fault error (DFC) after identification, and the fault error (DFC) information enters the fault management memory. The fault management system (DSM) of the ECU is responsible for realizing system degradation functions such as turning on the lights and limiting torque. Technicians can quickly judge the source of the fault by checking the fault management system (DSM) of the ECU, whether it is the fault of the engine itself or the torque limit problem caused by the fault of the after-treatment.

Corresponding to the above method embodiment, the present invention also provides a controller, as shown in FIG. 7 , the controller includes: a receiving module 710, a judging module 720, a recording module 730, and an executing module 740;

A receiving module 710, configured to receive the fault indication code sent by the post-processing electronic control unit;

Judging module 720, for judging whether the received fault indication code is equal to one of the pre-stored multiple post-processing system fault indication codes, and different pre-stored fault indication codes correspond to different alarm operations;

The recording module 730 is used to record the fault indication code when the received fault indication code is equal to one of the pre-stored multiple post-processing system fault indication codes;

An execution module 740, configured to execute corresponding alarm operations according to the fault indication code.

As shown in FIG. 8 , it is a schematic structural diagram of a post-processing electronic control unit provided by the present invention. The electronic control unit includes: a monitoring module 810 and a sending module 820;

A monitoring module 810, configured to monitor the operating status of the post-processing system;

The sending module 820 is used for the post-processing electronic control unit to send a fault indication code to the controller when the post-processing system is faulty, so that after the controller receives the fault code, it can judge whether the received fault indication code is consistent with the pre-stored multiple One of the post-processing system fault indication codes is equal, and different pre-stored fault indication codes correspond to different alarm operations; if the received fault indication code is equal to one of the pre-stored multiple post-processing system fault indication codes, record the fault indication code , and perform corresponding alarm operations according to the fault indication code.

Further, the present invention also provides a control system of an aftertreatment system, as shown in FIG. 9 , the system includes the controller as shown in FIG. 7 and the aftertreatment electronic control unit as shown in FIG. 8 .

For the convenience of description, when describing the above devices, functions are divided into various units and described separately. Of course, when implementing the present invention, the functions of each unit can be implemented in one or more pieces of software and/or hardware.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, as for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to part of the description of the method embodiment. The system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

The foregoing is only a specific embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention. It should be regarded as the protection scope of the present invention.

Claims (6)

1. a controlling method for after-treatment system, is characterized in that, comprising:

Controller receives the indicating fault code that reprocessing ECU (Electrical Control Unit) sends;

Whether the indicating fault code that controller judges described reception equates with in a plurality of after-treatment system indicating fault codes that prestore one, the different alarm operation of correspondence of the different faults indication code prestoring;

If the indicating fault code receiving equates with in a plurality of after-treatment system indicating fault codes that prestore one, record trouble is indicated code, and carries out corresponding alarm operation according to described indicating fault code.

2. method according to claim 1, is characterized in that, described indicating fault code is placed in reprocessing fault diagnosis message DM1DCU and sends.

3. a controller, is characterized in that, comprising:

Receiving module, the indicating fault code sending for receiving reprocessing ECU (Electrical Control Unit);

Whether judge module, equate the different alarm operation of correspondence of the different faults indication code prestoring with of a plurality of after-treatment system indicating fault codes that prestore for the indicating fault code that judges described reception;

Logging modle, while equating for the indicating fault code receiving and a plurality of after-treatment system indicating fault codes that prestore one, record trouble indication code;

Executive Module, for carrying out corresponding alarm operation according to described indicating fault code.

4. a controlling method for after-treatment system, is characterized in that, comprising:

Reprocessing ECU (Electrical Control Unit) monitoring after-treatment system running state;

When reprocessing ECU (Electrical Control Unit) monitoring after-treatment system breaks down, to controller, send indicating fault code;

So that controller receives after failure code, whether the indicating fault code that judges described reception equates with in a plurality of after-treatment system indicating fault codes that prestore one, the different alarm operation of correspondence of the different faults indication code prestoring; If the indicating fault code receiving equates with in a plurality of after-treatment system indicating fault codes that prestore one, record trouble is indicated code, and carries out corresponding alarm operation according to described indicating fault code.

5. a reprocessing ECU (Electrical Control Unit), is characterized in that, comprising:

Monitoring modular, for monitoring after-treatment system running state;

Transmitting module, while breaking down for reprocessing ECU (Electrical Control Unit) monitoring after-treatment system, to controller, send indicating fault code, so that controller receives after failure code, whether the indicating fault code that judges described reception equates with in a plurality of after-treatment system indicating fault codes that prestore one, the different alarm operation of correspondence of the different faults indication code prestoring; If the indicating fault code receiving equates with in a plurality of after-treatment system indicating fault codes that prestore one, record trouble is indicated code, and according to described indicating fault code, carries out corresponding alarm and grasp.

6. a control system for after-treatment system, is characterized in that, described system comprises:

Reprocessing ECU (Electrical Control Unit) as claimed in claim 5, controller claimed in claim 3.

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