CN213016508U - Fault diagnosis alarm device for realizing independent control of engine and post-processing - Google Patents

Abstract

The utility model provides a realize engine and aftertreatment's independent control's failure diagnosis alarm device, include: the system comprises an engine controller, a post-processing controller, a urea liquid level temperature sensor and a CAN instrument; the engine controller, the aftertreatment controller, the urea liquid level temperature sensor and the CAN instrument are connected to the same CAN line; the CAN instrument comprises a urea liquid level indicator, an MIL lamp indicator, an alarm lamp indicator, a regeneration state indicator and a carbon load indicator. The utility model discloses well engine and aftertreatment system adopt independent controller, carry out the diagnosis, report to the police and show of trouble, link together engine controller, aftertreatment controller, urea liquid level temperature sensor and CAN instrument through the CAN line, and the realization that CAN be convenient is mutual CAN information interaction, satisfies six regulations in the state to the requirement of OBD.

Description

Fault diagnosis alarm device for realizing independent control of engine and post-processing

Technical Field

The utility model belongs to the technical field of car OBD diagnostic system, concretely relates to realize engine and aftertreatment's fault diagnosis alarm device of independent control.

Background

With the promulgation of GB17691-2018 pollutant emission limits and measurement methods for heavy-duty diesel vehicles (sixth stage of China), OBD (On-Board diagnostic system) has put forward many new requirements. Compared with the fifth-stage regulation, the national sixth OBD monitoring system has more monitoring components, wider monitoring range, more complete monitoring function and more strict monitoring function. More specific and detailed regulations are made on monitoring items, monitoring requirements, monitoring conditions, lighting and fault code storage and removal.

In practical use, the aftertreatment controller is sometimes integrated in the engine controller, that is, the control of the engine and the aftertreatment is realized by one controller. But a more flexible approach is to use separate controllers for the engine and aftertreatment so that the same engine can be matched to aftertreatment systems from different manufacturers as needed. At present, no relevant technical scheme appears.

SUMMERY OF THE UTILITY MODEL

The above-mentioned not enough to prior art, the utility model provides a realize engine and aftertreatment's independent control's failure diagnosis alarm device to solve above-mentioned technical problem.

The utility model provides a realize engine and aftertreatment's independent control's failure diagnosis alarm device, include: the system comprises an engine controller, a post-processing controller, a urea liquid level temperature sensor and a CAN instrument; the engine controller, the aftertreatment controller, the urea liquid level temperature sensor and the CAN instrument are connected to the same CAN line; the CAN instrument comprises a urea liquid level indicator, an MIL lamp indicator, an alarm lamp indicator, a regeneration state indicator and a carbon load indicator.

Further, the engine controller is also connected with an engine of the vehicle; the aftertreatment controller is also connected with an aftertreatment system of the vehicle.

Further, the urea liquid level temperature sensor comprises a liquid level sensor and a temperature sensor which are arranged in the urea box.

Further, the urea liquid level indicator is connected with the urea liquid level temperature sensor through a CAN line, the MIL lamp indicator and the alarm lamp indicator are connected with the engine controller through CAN lines, and the regeneration state indicator and the carbon load indicator which are arranged in the CAN instrument are connected with the aftertreatment controller through CAN lines.

The utility model has the advantages that,

the utility model provides a realize engine and aftertreatment's independent control's failure diagnosis alarm device, engine and aftertreatment system adopt independent controller, carry out the diagnosis of trouble, and carry out the demonstration trouble of MIL lamp according to the fault type, and carry out torque limitation and speed of a motor vehicle restriction after the trouble, link together engine controller, aftertreatment controller, urea liquid level temperature sensor and CAN instrument through the CAN line, CAN be convenient realization CAN information interaction each other, satisfy six regulations in the country to the requirement of OBD.

Furthermore, the utility model relates to a principle is reliable, and simple structure has very extensive application prospect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the structure of an apparatus according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a system according to an embodiment of the present invention;

FIG. 3 is a diagram of post-processing fault classification according to an embodiment of the present invention;

fig. 4 is a relationship diagram of torque limitation according to failure time according to an embodiment of the present invention;

wherein, 1, an engine controller; 2. a post-processing controller; 3. a urea level temperature sensor; 4. a CAN instrument; 5. a CAN line.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following explains key terms appearing in the present invention.

And (3) MIL: a function Indicator Lamp.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

As shown in fig. 1, an embodiment of the present application provides a fault diagnosis warning device that implements independent control of an engine and an aftertreatment, including: the system comprises an engine controller 1, a post-processing controller 2, a urea liquid level temperature sensor 3 and a CAN instrument 4; the engine controller, the aftertreatment controller, the urea liquid level temperature sensor and the CAN instrument are connected to the same CAN line 5; the CAN instrument comprises a urea liquid level indicator, an MIL lamp indicator, an alarm lamp indicator, a regeneration state indicator and a carbon load indicator; the engine controller is also connected with an engine of a vehicle; the aftertreatment controller is also connected with an aftertreatment system of the vehicle. The urea liquid level temperature sensor comprises a liquid level sensor and a temperature sensor which are arranged in the urea box. The urea liquid level indicator is connected with the urea liquid level temperature sensor through a CAN line, the MIL lamp indicator and the alarm lamp indicator are connected with the engine controller through CAN lines, and the regeneration state indicator and the carbon load indicator arranged in the CAN instrument are connected with the post-processing controller through CAN lines

The regeneration status indicator is used for displaying the regeneration status of the vehicle; the carbon load indicator is used for displaying the carbon load of the DPF system of the vehicle.

Wherein OBD part mainly includes among the aftertreatment controller: the system comprises a fault diagnosis module, a fault de-jitter module, a fault classification storage and clearing module, a B1 counter module, a freeze frame module, a ready state module, an in-use diagnosis frequency module and a CAN transceiving module; and the fault diagnosis module diagnoses each post-processing fault in the post-processing fault processing, and the diagnosis result is sent to the fault debouncing processing module to perform the debouncing processing of the fault. After the debounce processing of the fault, if the fault does occur, the fault is sent to the fault storage module.

The OBD part in the engine controller mainly comprises: the system comprises a fault diagnosis module, a fault de-jitter module, a fault classification storage and clearing module, an MIL counter module, a B1 counter module, an alarm and performance limiting module, an MIL lamp control module, a freeze frame module, a ready state module, an in-use diagnosis frequency module, an auxiliary function module and a CAN transceiving module. In an engine controller, an engine fault diagnosis module diagnoses faults of all engines, and the diagnosis result is sent to a fault dithering elimination processing module to carry out dithering elimination processing on the faults. After the fault debounce processing, if the fault happens, the fault is sent to a fault storage and removal module to store the fault and remove the fault after fault repair.

In the fault storing and clearing module, the categories and processing methods of the faults related to the post-processing are divided into eight categories as shown in fig. 2:

SPN 1: no failure;

SPN 2: class a and class B1 failures over 200 hours;

SPN 3: class B failures and class B1 failure counters are less than 200 hours;

SPN 4: a class C fault;

SPN 5: the dosing is interrupted;

SPN 6: the consumption of the reactant is low;

SPN 7: the quality of the reactant is incorrect;

SPN 8: diagnose system/post-process class a faults.

Wherein the code is a unique identification code of a fault category;

in addition, in this embodiment, the low urea concentration fault is defined as SPN2 and SPN7, and when the low urea concentration fault is diagnosed in the post-processing fault diagnosis module, the SPN2 and SPN7 are sent to the engine controller through the DM1 CAN message of the CAN transceiver module, and the lighting is controlled through SPN2 and the torque limit is controlled through SPN7, so that an alarm is realized. The CAN transceiver module of the engine controller receives the SPN2 and the SPN7 sent by the aftertreatment controller, sends the SPN2 to the MIL counter module and the MIL lamp control module, sends the SPN7 to the alarm and performance limiting module, and coordinates the faults of the engine to carry out light-on and torque limiting.

At the MIL counter module, class a and class B1 failures over 200 hours are counted as required by the regulations. There is only one MIL counter, which counts if both class a and class B1 failures exceed 200 hours of the aftertreatment system or engine.

And in the MIL lamp control module, the highest-level faults of the post-processing system and the engine are taken to control the MIL lamp to be on. For example, SPN2 represents a class a and class B1 fault for more than 200 hours, requiring the MIL lights to be continuously lit both before and after engine start, and if there is a simultaneous class C fault in the engine controller, then the lights are lit at the highest level class a fault. If the aftertreatment controller sends the SPN3 and there is a class a fault in the engine controller, the lights are lit at the highest level class a fault.

Wherein, the post-processing controller and the engine controller respectively record the number of engine operation hours after the B1 type fault is activated for the B1 type fault.

And the engine controller sends the final lighting requirement of the MIL lamp to a CAN instrument through a CAN transceiver module and controls the work of the MIL lamp indicator.

As shown in FIG. 3, the alarm and performance limiting module receives the SPN7, coordinates the engine-related fault (EGR valve stuck fault) which causes the alarm of the driver, sends a CAN message to the CAN instrument through the CAN transceiver module to control the operation of the alarm indicator lamp, and simultaneously the performance limiting module starts to time. The alarm lamp indicator is immediately activated if any of five faults, namely incorrect reactant quality, low reactant consumption, interruption of dosing, stuck EGR valve and diagnostic system/post-emission treatment class a fault, confirms that a fault has occurred.

Five faults of incorrect reactant quality, low reactant consumption, interruption of dosing, jamming of an EGR valve and treatment of A faults of a diagnosis system/emission after-treatment are respectively timed, namely five counters are respectively counted, and corresponding torque limitation and vehicle speed limitation are carried out when the counter reaches a preset hour.

Taking the low urea concentration fault as an example, when the timing reaches 10 hours, the engine realizes torque limitation by controlling oil injection, if the fault is not repaired continuously, when the timing reaches 20 hours, the engine limits the vehicle speed by controlling the oil injection.

And if the post-processing system has a plurality of faults causing the MIL lamp to be lightened, taking the highest-level fault for sending. That is, if there are both a class a and class B1 failures that exceed 200 hours, a class B failure and a class B1 failure counter is less than 200 hours and a class C failure, the post-processing controller sends SPN 2. If there is a simultaneous class B fault and the class B1 fault counter is less than 200 hours and a class C fault, the aftertreatment controller sends SPN 3.

If the aftertreatment system has multiple faults simultaneously causing warning light alarms and drivability limits, such as faults with interrupted dosing, low reagent consumption, and incorrect reagent quality, then the corresponding SPNs (e.g., SPN5, SPN6, and SPN7) are sent to the engine controller.

The urea liquid level temperature sensor sends liquid level and temperature information to a CAN line, and a post-processing controller needs to receive the CAN information to perform relevant post-processing faults, such as fault diagnosis with low urea consumption. The engine controller receives urea level information for limiting vehicle speed when the urea level is 0% and torque when the urea level is less than 5%. And the CAN instrument receives urea liquid level information and is used for displaying the urea liquid level and displaying warning of low urea liquid level when the urea storage is low.

The ready state of the aftertreatment fault is calculated by a ready state module in the aftertreatment controller and a ready/not ready result is sent to the engine controller via a CAN transceiver module via a DM5 CAN message. The ready state of the engine fault is calculated by a ready state module in an engine controller, the ready state of the post-processing fault sent by the post-processing controller is coordinated, the final ready/non-ready state is sent to an MIL lamp control module, the MIL lamp control module synthesizes information required to be displayed by other MIL lamps, and the information is sent to a CAN instrument through a CAN receiving and sending module to display the state of the fault lamp.

The freeze frame module records data related to vehicle operating conditions when fault codes are stored;

the in-use diagnosis frequency module calculates a ratio of the number of occurrences of a condition that the one or a group of failure diagnosis units can complete the failure diagnosis to the number of driving cycle diagnoses.

Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (4)

1. A failure diagnosis warning device that realizes independent control of an engine and an aftertreatment, characterized by comprising: the system comprises an engine controller, a post-processing controller, a urea liquid level temperature sensor and a CAN instrument; the engine controller, the aftertreatment controller, the urea liquid level temperature sensor and the CAN instrument are connected to the same CAN line; the CAN instrument comprises a urea liquid level indicator, an MIL lamp indicator, an alarm lamp indicator, a regeneration state indicator and a carbon load indicator.

2. The fault diagnosis warning device for achieving independent control of an engine and an aftertreatment according to claim 1, characterized in that the engine controller is further connected with an engine of a vehicle; the aftertreatment controller is also connected with an aftertreatment system of the vehicle.

3. The device of claim 1, wherein the urea level temperature sensor comprises a level sensor and a temperature sensor disposed within the urea tank.

4. The device of claim 1, wherein the urea level indicator is connected to the urea level temperature sensor through a CAN line, the MIL lamp indicator and the warning lamp indicator are connected to the engine controller through a CAN line, and the regeneration status indicator and the carbon load indicator provided in the CAN meter are connected to the aftertreatment controller through a CAN line.

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