CN109281739B - Wiring detection method and detection device - Google Patents
Wiring detection method and detection device Download PDFInfo
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- CN109281739B CN109281739B CN201811141396.6A CN201811141396A CN109281739B CN 109281739 B CN109281739 B CN 109281739B CN 201811141396 A CN201811141396 A CN 201811141396A CN 109281739 B CN109281739 B CN 109281739B
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The embodiment of the invention discloses a wiring detection method and a detection device. The wiring detection method comprises the following steps: controlling the engine to continuously run for a preset time under a preset working condition; acquiring a temperature value measured by each temperature sensor; whether the measured temperature values meet the temperature relationship of the temperature sensors under the preset working condition or not is detected, and when any temperature value is detected not to meet the temperature relationship, the pin wiring error between the temperature sensor corresponding to the temperature value not meeting the temperature relationship and the ECU is judged. The wiring detection method provided by the embodiment of the invention is used for detecting whether the wiring of at least two temperature sensors of the post-processing system and pins of the ECU is wrong or not, and when the wiring is detected to be wrong, the temperature measured by the temperature sensors is judged to be unreliable, so that the method has the effects of simple detection method and reliable result.
Description
Technical Field
The embodiment of the invention relates to an engine post-processing technology, in particular to a wiring detection method and a detection device.
Background
With the increasing prominence of the air pollution problem, the legislation on the vehicle exhaust emission standard is more and more strict. Existing exhaust treatment systems include Diesel Oxidation Catalysts (DOCs), particulate traps (DPFs), and Selective Catalytic Reduction (SCR) devices.
In the emission technology of a national six-engine, four temperature sensors (including a temperature sensor before DOC, a temperature sensor before DPF, a temperature sensor before SCR and a temperature sensor after SCR) are applied to control pressure build-up, injection, correction of NOx conversion efficiency, regeneration and the like of urea, an ECU receives voltage values of the corresponding temperature sensors through four pins and converts the voltage values into temperature values through the inside, and because the temperature measurement principles of the four temperature sensors are consistent and the pin identification principles of the ECU are consistent, if the wiring of the two sensors is just opposite, the temperature values read by the ECU are wrong, so that the problems of no injection, over-injection, less injection and the like of urea are caused, and the emission and the dynamic property of the engine are influenced; if the temperature of the DPF is abnormal, the regeneration of the DPF can not be carried out, and the DPF is blocked in serious conditions, so that the emission and dynamic property of an engine are influenced.
In the prior art, the credibility of the wiring of the temperature sensor is judged by comparing the temperature measured by the sensor with the temperature calculated by the model, and if the model is calculated incorrectly, the problems of inaccurate diagnosis, error report and the like are caused.
Disclosure of Invention
The embodiment of the invention provides a wiring detection method and a detection device, which are used for detecting whether wiring of pins of at least two temperature sensors and an ECU (electronic control unit) of a post-processing system is wrong or not and judging the temperature credibility of the temperature sensors.
In a first aspect, an embodiment of the present invention provides a wiring detection method for detecting pin wiring between at least two temperature sensors of an aftertreatment system and an electronic control unit ECU, including:
controlling the engine to continuously run for a preset time under a preset working condition;
acquiring a temperature value measured by each temperature sensor;
and detecting whether the measured temperature value meets the temperature relationship of the temperature sensor under the preset working condition, and judging that the pin connection of the temperature sensor corresponding to the temperature value which does not meet the temperature relationship and the ECU is wrong when any temperature value is detected not to meet the temperature relationship.
In a second aspect, an embodiment of the present invention further provides a wiring detection device for detecting pin wiring between at least two temperature sensors of an aftertreatment system and an electronic control unit ECU, including:
the control module is used for controlling the engine to operate for a preset time under a preset working condition;
the acquisition module is used for acquiring the temperature value measured by each temperature sensor;
and the judging module is used for detecting whether the measured temperature value meets the temperature relationship of the temperature sensor under the preset working condition, and judging that the temperature sensor corresponding to the temperature value which does not meet the temperature relationship and the pin wiring of the ECU are wrong when any temperature value which does not meet the temperature relationship is detected.
The embodiment of the invention provides a wiring detection method, which is used for detecting the wiring of at least two temperature sensors of an aftertreatment system and pins of an ECU (electronic control unit), wherein the temperature of each part of the aftertreatment system can be in a certain interval and present a specific temperature relationship by controlling an engine to continuously run for a preset time under a preset working condition; then acquiring the temperature value measured by each temperature sensor; when any temperature value is detected not to satisfy the temperature relationship of the temperature sensor under the corresponding preset working condition, the pin wiring error between the temperature sensor corresponding to the temperature value not satisfying the temperature relationship and the ECU can be determined, and the temperature measured by the temperature sensor is determined to be unreliable.
Drawings
Fig. 1 is a schematic flow chart of a wiring detection method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wiring detection device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another wiring detection device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic flow chart of a wiring detection method according to an embodiment of the present invention, which is applicable to detecting pin wiring between at least two temperature sensors of an aftertreatment system and an electronic control unit ECU, and includes:
and step 110, controlling the engine to continuously run for a preset time under a preset working condition.
And step 120, acquiring the temperature value measured by each temperature sensor.
And step 130, detecting whether the measured temperature values meet the temperature relationship of the temperature sensors under the preset working condition, and judging that the pins of the temperature sensors corresponding to the temperature values which do not meet the temperature relationship are in wrong wiring with the ECU when any temperature value is detected not to meet the temperature relationship.
It can be understood that an Electronic Control Unit (ECU), also called a "traveling computer" or an "on-board computer", is a controller that performs calculation, processing and judgment according to signals input by various sensors and then outputs commands to Control the operation of an actuator, and is installed on an engine body. The aftertreatment system includes a plurality of temperature sensors, each connected to a pin specific to the ECU. When the engine is in certain specific working conditions (such as parking regeneration), the temperature of each part of the aftertreatment system is kept in a specific range, the temperature value measured by each temperature sensor meets a specific temperature relation, the temperature relation is stored in the ECU in advance, and when the ECU detects that any temperature value does not meet the temperature relation, the pin connection error between the temperature sensor corresponding to the temperature value not meeting the temperature relation and the ECU is judged.
The technical scheme of the embodiment is used for detecting pin connection between at least two temperature sensors of the aftertreatment system and the ECU, and the temperature of each part of the aftertreatment system can be in a certain interval and present a specific temperature relationship by controlling the engine to continuously run for a preset time under a preset working condition; then acquiring the temperature value measured by each temperature sensor; when any temperature value is detected not to satisfy the temperature relationship of the temperature sensor under the corresponding preset working condition, the pin wiring error between the temperature sensor corresponding to the temperature value not satisfying the temperature relationship and the ECU can be determined, and the temperature measured by the temperature sensor is determined to be unreliable.
On the basis of the foregoing technical solution, optionally, the method for detecting a connection line provided in this embodiment further includes:
when a user presses the wiring detection switch, the operation of controlling the engine to continuously run for a preset time under a preset working condition is triggered and executed.
It is understood that a wiring detection switch may be provided on the vehicle, and when the wiring detection switch is pressed by a user, the wiring detection switch sends a trigger signal, such as a voltage signal, to the ECU, and the ECU controls the engine to operate for a preset time under a preset condition to perform wiring detection of the temperature sensor.
It should be noted that the ECU may set a preset condition to automatically perform diagnosis when the vehicle is started, for example, detection may be performed after a certain time interval, detection may be performed when the vehicle is started for the first time, and the like.
Optionally, before controlling the engine to operate continuously for the preset time under the preset working condition, the method further includes:
detecting whether each temperature sensor fails;
and if each temperature sensor is judged to have no fault, controlling the whole vehicle state to be in a temperature sensor wiring detection state.
It can be understood that, to detect whether the temperature sensors are connected in a wrong way, it is first necessary to ensure that each temperature sensor has no fault, i.e. the ECU can normally detect the signals measured by each temperature sensor. Therefore, before the engine is controlled to continuously run for the preset time under the preset working condition, whether each temperature sensor has faults or not can be detected through the ECU according to the existing diagnosis logic, for example, when a certain temperature sensor is detected to have short circuit and open circuit faults, the ECU sends out fault reminding to inform a worker to overhaul, and only when all the temperature sensors work normally, wiring detection can be carried out.
Optionally, the temperature sensor wiring detection state includes: the current accelerator opening is 0; the vehicle speed is 0; the engine speed is at idle and the duration exceeds a set value.
It can be understood that, generally, when the vehicle is off-line, the wiring detection of the temperature sensor is needed, and if the wiring is wrong, the vehicle can be out of order during running, and the emission and the dynamic property of the engine are influenced. After the vehicle is started, the ECU automatically detects that the current accelerator opening is 0; the vehicle speed is 0; when the engine speed is idling and the duration time exceeds a set value, the vehicle is normally started, and the vehicle can enter a temperature sensor detection state. The duration of the idle speed of the engine may be 1min or more, and may be selected according to actual conditions, which is not limited in the embodiments of the present invention.
Optionally, the aftertreatment system includes a diesel oxidation catalyst DOC, a particulate filter DPF, and a selective catalytic reduction SCR device, and the number of the temperature sensors is four, and the temperature sensors include a DOC front temperature sensor, a DPF front temperature sensor, an SCR front temperature sensor, and an SCR rear temperature sensor;
controlling the engine to continuously run for a preset time under a preset working condition comprises:
controlling the opening degree of a throttle valve of an engine to be a preset opening degree;
controlling the rotating speed of the engine to be a preset rotating speed;
and controlling the DPF to perform fuel injection for a preset time.
It is understood that a Diesel Oxidation Catalyst (DOC) is installed in an exhaust pipe of an engine to convert carbon monoxide (CO) and Hydrocarbon (HC) in exhaust gas of the engine into harmless water (H) through an Oxidation reaction20) And carbon dioxide (CO)2) The apparatus of (1). The temperature sensor before the DOC is used for monitoring the temperature before the DOC, is used for temperature control and credibility detection of the DOC, and influences conversion of HC inside the DOC when the temperature is too high or too low.
A Particulate trap (DPF) is a ceramic Filter installed in the exhaust system of a Diesel engine that traps Particulate emissions before they enter the atmosphere. The temperature sensor before the DPF is used for monitoring the temperature before the DPF, is used for temperature control and credibility detection of the DPF, and influences the trapping and regeneration of Particulate Matters (PM) in the DPF when the temperature is too high or too low.
The Selective Catalytic Reduction (SCR) technology is a treatment process for nitrogen oxides (NOx) in tail gas emission of diesel vehicles, i.e. under the action of a catalyst, a reducing agent ammonia or urea is sprayed in to reduce NOx in tail gas into N2And H2And O. The SCR front and rear temperature sensors are respectively used for monitoring the temperatures of the SCR front and rear, building pressure, spraying and converting NOx of urea, and if the temperature is abnormal, urea spraying is influenced, so that the NOx emission exceeds the standard or NH is generated3And (4) leakage.
In the DPF filtration, the accumulation of particulate matter in the particulate filter causes an increase in the exhaust back pressure of the diesel engine, and when the exhaust back pressure reaches 16kPa to 20kPa, the diesel engine performance starts to deteriorate, so that it is necessary to periodically remove the particulate matter to restore the particulate filter to the original operating state, i.e., to regenerate it. The parking regeneration is a regeneration mode, namely under the condition of parking, the engine raises the exhaust temperature by means of raising the rotating speed, controlling a throttle valve, injecting fuel oil into an exhaust pipe and the like, so that the front temperature of the DPF reaches about 600 ℃ of the regeneration requirement, at the moment, carbon particles in the DPF perform high-temperature chemical reaction with oxygen, and the carbon particles can be effectively reduced through the parking regeneration.
For example, for a certain engine, the ECU controls the engine to enter a parking regeneration mode from an idle speed, the opening degree of a throttle valve is controlled to be 20%, the rotating speed is increased to 1900rpm, and the DPF performs fuel injection and keeps the stage for 10 min; after the regeneration is stable, the ECU reads the temperature values monitored by the current four sensors, and judges whether the four temperature values meet the following temperature relationship: t is1：300℃～350℃；T2：580℃～620℃；T3：550℃～590℃；T4：500℃～540℃(T4＜T3＜T2，T2-T3≈30℃，T3-T4About 50 ℃ C. Wherein, T1、T2、T3、T4Respectively are temperature values measured by a temperature sensor before DOC, a temperature sensor before DPF, a temperature sensor before SCR and a temperature sensor after SCR. For accomplishing the wiring detection flow smoothly, ECU control throttle is invalid this moment, promptly: the driver must complete the plausibility diagnosis in order to operate the entire vehicle.
Optionally, the wiring detection method further includes:
and outputting fault information when the temperature sensor corresponding to the temperature value not meeting the temperature relationship is judged to be in error in wiring with the pins of the ECU.
Continuing with the above example, if T is obtained2At 580-620 ℃ and T1The temperature is 580-620 ℃, which indicates that pins of the ECU connected with the temperature sensor before the DOC and the temperature sensor before the DPF are reversely connected, and the ECU outputs fault information, for example, the fault information can be displayed on a display screenThe pins of the device are reversely connected, or the fault is displayed by using an indicator light and the like, so that a user is prompted to check the wiring of the temperature sensor, and the embodiment of the invention does not limit the connection.
It can be understood that if the wiring of the temperature sensor is judged not to be wrong, the prompt message without fault can be output, the parking regeneration mode is exited, and the user can normally operate the whole vehicle.
Optionally, after determining that the temperature value does not satisfy the pin wiring error between the temperature sensor corresponding to the temperature relationship and the ECU, the method further includes:
and correcting the connection relation between the pins of the ECU and the temperature sensors according to the temperature values measured by the temperature sensors and the temperature relations of the temperature sensors.
It will be appreciated that when an ECU is identified as having a faulty wiring with the temperature sensor, if the fault is still present within a certain time or a certain driving cycle, the ECU triggers corrective logic to automatically configure the pins so that the ECU identifies the correct sensor temperature value. For example, when pins of the ECU connected with the temperature sensor before the DOC and the temperature sensor before the DPF are connected reversely, the ECU identifies the signal acquired by the pin originally set to be connected with the temperature sensor before the DPF as a temperature value before the DOC, and identifies the signal acquired by the pin originally set to be connected with the temperature sensor before the DOC as a temperature value before the DPF.
Optionally, the wiring detection method further includes:
and storing the corrected connection relation between the pins of the ECU and each temperature sensor in the ECU, automatically reading the corrected connection relation between the pins of the ECU and each temperature sensor when the ECU is electrified again, and connecting the pins of the ECU with each temperature sensor.
The corrected connection relation between the pins of the ECU and each temperature sensor is stored in the ECU, so that the correct configuration can be automatically read when the ECU is electrified again, and the pin diagnosis of the ECU is avoided being required during each electrification.
Fig. 2 is a schematic structural diagram of a wiring detection device according to an embodiment of the present invention, which can be used to execute the wiring detection method in the foregoing embodiment, and is used to detect the wiring of pins of at least two temperature sensors 1 and an ECU2 of an aftertreatment system, including: the control module 10 is used for controlling the engine to operate for a preset time under a preset working condition; an obtaining module 20, configured to obtain a temperature value measured by each temperature sensor 1; the judging module 30 is configured to detect whether the measured temperature values satisfy the temperature relationship of the temperature sensor 1 under the preset working condition, and determine that the pin connection of the temperature sensor 1 and the ECU2 corresponding to the temperature values that do not satisfy the temperature relationship is incorrect when detecting that any one of the temperature values does not satisfy the temperature relationship.
It can be understood that an Electronic Control Unit (ECU), also called a "traveling computer" or an "on-board computer", is a controller that performs calculation, processing and judgment according to signals input by various sensors and then outputs commands to Control the operation of an actuator, and is installed on an engine body. The control module 10, the acquisition module 20 and the judgment module 30 may be built into the electronic control unit 2. The aftertreatment system includes a plurality of temperature sensors, each connected to a pin specific to the ECU. When the engine is in certain specific working conditions (such as parking regeneration), the temperature of each part of the aftertreatment system is kept in a specific range, the temperature value measured by each temperature sensor meets a specific temperature relation, the temperature relation is stored in the ECU in advance, and when the ECU detects that any temperature value does not meet the temperature relation, the pin connection error between the temperature sensor corresponding to the temperature value not meeting the temperature relation and the ECU is judged.
The technical scheme of the embodiment is used for detecting pin connection between at least two temperature sensors of the aftertreatment system and the ECU, the control module controls the engine to continuously run for a preset time under a preset working condition, and the temperature of each part of the aftertreatment system can be in a certain interval and present a specific temperature relationship; then, acquiring the temperature value measured by each temperature sensor through an acquisition module; whether the measured temperature value meets the temperature relationship of the temperature sensor under the preset working condition or not is detected through the judging module, when any temperature value is detected not to meet the temperature relationship of the temperature sensor under the corresponding preset working condition, the fact that the temperature sensor corresponding to the temperature value not meeting the temperature relationship and the pin wiring of the ECU are wrong can be determined, the temperature measured by the temperature sensor is not credible at the moment, and the effects of simple detection method and reliable result are achieved.
On the basis of the above technical solution, fig. 3 is a schematic structural diagram of another wiring detection device provided in an embodiment of the present invention. Optionally, the wiring detection device further includes: and the wiring detection switch 40 is used for triggering the control module 10 to execute the operation of controlling the engine to continuously run under the preset working condition for the preset time when the user presses the wiring detection switch 40.
It is understood that a wiring detection switch may be provided on the vehicle, and when the wiring detection switch is pressed by a user, the wiring detection switch sends a trigger signal, such as a voltage signal, to the ECU, and the ECU controls the engine to operate for a preset time under a preset condition to perform wiring detection of the temperature sensor.
It should be noted that the ECU may set a preset condition to automatically perform diagnosis when the vehicle is started, for example, detection may be performed after a certain time interval, detection may be performed when the vehicle is started for the first time, and the like.
Optionally, with continued reference to fig. 3, the wiring detection device further includes: a detection module 50 for detecting whether each temperature sensor is malfunctioning; the control module 10 is further configured to control the entire vehicle state to be in a temperature sensor wiring detection state if it is determined that each temperature sensor is not faulty.
It can be understood that, to detect whether the temperature sensors are connected in a wrong way, it is first necessary to ensure that each temperature sensor has no fault, i.e. the ECU can normally detect the signals measured by each temperature sensor. Therefore, before the engine is controlled to continuously run for the preset time under the preset working condition, whether each temperature sensor has faults or not can be detected through the ECU according to the existing diagnosis logic, for example, when a certain temperature sensor is detected to have short circuit and open circuit faults, the ECU sends out fault reminding to inform a worker to overhaul, and only when all the temperature sensors work normally, wiring detection can be carried out.
Optionally, the temperature sensor wiring detection state includes: the current accelerator opening is 0; the vehicle speed is 0; the engine speed is at idle and the duration exceeds a set value.
It can be understood that, generally, when the vehicle is off-line, the wiring detection of the temperature sensor is needed, and if the wiring is wrong, the vehicle can be out of order during running, and the emission and the dynamic property of the engine are influenced. After the vehicle is started, the ECU automatically detects that the current accelerator opening is 0; the vehicle speed is 0; when the engine speed is idling and the duration time exceeds a set value, the vehicle is normally started, and the vehicle can enter a temperature sensor detection state. The duration of the idle speed of the engine may be 1min or more, and may be selected according to actual conditions, which is not limited in the embodiments of the present invention.
Optionally, the aftertreatment system includes a diesel oxidation catalyst DOC, a particulate filter DPF, and a selective catalytic reduction SCR device, and the number of the temperature sensors is four, and the temperature sensors include a DOC front temperature sensor, a DPF front temperature sensor, an SCR front temperature sensor, and an SCR rear temperature sensor;
controlling the engine to continuously run for a preset time under a preset working condition comprises:
controlling the opening degree of a throttle valve of an engine to be a preset opening degree;
controlling the rotating speed of the engine to be a preset rotating speed;
and controlling the DPF to perform fuel injection for a preset time.
It is understood that a Diesel Oxidation Catalyst (DOC) is installed in an exhaust pipe of an engine to convert carbon monoxide (CO) and Hydrocarbon (HC) in exhaust gas of the engine into harmless water (H) through an Oxidation reaction20) And carbon dioxide (CO)2) The apparatus of (1). The temperature sensor before the DOC is used for monitoring the temperature before the DOC, is used for temperature control and credibility detection of the DOC, and influences conversion of HC inside the DOC when the temperature is too high or too low.
A Particulate trap (DPF) is a ceramic Filter installed in the exhaust system of a Diesel engine that traps Particulate emissions before they enter the atmosphere. The temperature sensor before the DPF is used for monitoring the temperature before the DPF, is used for temperature control and credibility detection of the DPF, and influences the trapping and regeneration of Particulate Matters (PM) in the DPF when the temperature is too high or too low.
The Selective Catalytic Reduction (SCR) technology is a treatment process for nitrogen oxides (NOx) in tail gas emission of diesel vehicles, i.e. under the action of a catalyst, a reducing agent ammonia or urea is sprayed in to reduce NOx in tail gas into N2And H2And O. The SCR front and rear temperature sensors are respectively used for monitoring the temperatures of the SCR front and rear, building pressure, spraying and converting NOx of urea, and if the temperature is abnormal, urea spraying is influenced, so that the NOx emission exceeds the standard or NH is generated3And (4) leakage.
In the DPF filtration, the accumulation of particulate matter in the particulate filter causes an increase in the exhaust back pressure of the diesel engine, and when the exhaust back pressure reaches 16kPa to 20kPa, the diesel engine performance starts to deteriorate, so that it is necessary to periodically remove the particulate matter to restore the particulate filter to the original operating state, i.e., to regenerate it. The parking regeneration is a regeneration mode, namely under the condition of parking, the engine raises the exhaust temperature by means of raising the rotating speed, controlling a throttle valve, injecting fuel oil into an exhaust pipe and the like, so that the front temperature of the DPF reaches about 600 ℃ of the regeneration requirement, at the moment, carbon particles in the DPF perform high-temperature chemical reaction with oxygen, and the carbon particles can be effectively reduced through the parking regeneration.
For example, for a certain engine, the ECU controls the engine to enter a parking regeneration mode from an idle speed, the opening degree of a throttle valve is controlled to be 20%, the rotating speed is increased to 1900rpm, and the DPF performs fuel injection and keeps the stage for 10 min; after the regeneration is stable, the ECU reads the temperature values monitored by the current four sensors and judges whether the four temperature values meet the following temperature relation T1：300℃～350℃；T2：580℃～620℃；T3：550℃～590℃；T4：500℃～540℃(T4＜T3＜T2，T2-T3≈30℃，T3-T4About 50 ℃ C. Wherein, T1、T2、T3、T4Respectively DOC front temperature sensorThe temperature values measured by the temperature sensor before the DPF, the temperature sensor before the SCR and the temperature sensor after the SCR. For accomplishing the wiring detection flow smoothly, ECU control throttle is invalid this moment, promptly: the driver must complete the plausibility diagnosis in order to operate the entire vehicle.
Optionally, with continued reference to fig. 3, the wiring detection device further includes: and the output module 60 is used for outputting fault information when the pin connection error between the temperature sensor corresponding to the temperature value not meeting the temperature relationship and the ECU is judged.
Continuing with the above example, if T is obtained2At 580-620 ℃ and T1The temperature is 580 to 620 ℃, which indicates that pins of the ECU connected with the DOC front temperature sensor and the DPF front temperature sensor are reversely connected, and the ECU outputs fault information, for example, the pins of the DOC front temperature sensor and the DPF front temperature sensor may be reversely connected on a display screen, or a fault may be displayed by using an indicator lamp or the like, so as to prompt a user to check the wiring of the temperature sensor, which is not limited in the embodiment of the present invention.
It can be understood that if the wiring of the temperature sensor is judged not to be wrong, the prompt message without fault can be output, the parking regeneration mode is exited, and the user can normally operate the whole vehicle.
Optionally, with reference to fig. 3, the wiring detection apparatus further includes a correction module 70, configured to correct a connection relationship between pins of the ECU and each temperature sensor according to the temperature value measured by each temperature sensor and the temperature relationship between each temperature sensor when it is determined that the temperature value does not satisfy the pin wiring error between the temperature sensor corresponding to the temperature relationship and the ECU.
It will be appreciated that when an ECU is identified as having a faulty wiring with the temperature sensor, if the fault is still present within a certain time or a certain driving cycle, the ECU triggers corrective logic to automatically configure the pins so that the ECU identifies the correct sensor temperature value. For example, when pins of the ECU connected with the temperature sensor before the DOC and the temperature sensor before the DPF are connected reversely, the ECU identifies the signal acquired by the pin originally set to be connected with the temperature sensor before the DPF as a temperature value before the DOC, and identifies the signal acquired by the pin originally set to be connected with the temperature sensor before the DOC as a temperature value before the DPF.
Optionally, with continued reference to fig. 3, the wiring detection device further includes: and the storage module 80 is configured to store the corresponding relationship between the pins of the modified ECU and the temperature sensors in the ECU, and automatically read the connection relationship between the pins of the modified ECU and the temperature sensors when the ECU is powered on again, so as to connect the pins of the ECU and the temperature sensors.
The corrected connection relation between the pins of the ECU and each temperature sensor is stored in the ECU, so that the correct configuration can be automatically read when the ECU is electrified again, and the pin diagnosis of the ECU is avoided being required during each electrification.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (16)
1. A wiring detection method for detecting pin wiring of at least two temperature sensors of an aftertreatment system to an electronic control unit ECU, comprising:
controlling the engine to continuously run for a preset time under a preset working condition;
acquiring a temperature value measured by each temperature sensor;
and detecting whether the measured temperature value meets the temperature relationship of the temperature sensor under the preset working condition, and judging that the pin connection of the temperature sensor corresponding to the temperature value which does not meet the temperature relationship and the ECU is wrong when any temperature value is detected not to meet the temperature relationship.
2. The wiring detection method according to claim 1, wherein the operation of controlling the engine to operate for a preset time under a preset condition is triggered to be performed when the user presses the wiring detection switch.
3. The wiring detection method of claim 1, further comprising, before said controlling the engine to continue operating for a preset time at a preset operating condition:
detecting whether each of the temperature sensors is faulty;
and if each temperature sensor is determined to be free of faults, controlling the whole vehicle state to be in a temperature sensor wiring detection state.
4. The wire detection method according to claim 3, wherein the temperature sensor wire detection state includes:
the current accelerator opening is 0;
the vehicle speed is 0;
the engine speed is at idle and the duration exceeds a set value.
5. The wiring detection method according to claim 1, wherein the aftertreatment system comprises a diesel oxidation catalyst DOC, a particulate trap DPF, and a selective catalytic reduction SCR device, and the number of the temperature sensors is four, and the temperature sensors comprise a DOC front temperature sensor, a DPF front temperature sensor, an SCR front temperature sensor, and an SCR rear temperature sensor;
the control engine continuously operates for a preset time under a preset working condition comprises the following steps:
controlling the opening degree of a throttle valve of the engine to be a preset opening degree;
controlling the rotating speed of the engine to be a preset rotating speed;
and controlling the DPF to perform fuel injection for a preset time.
6. The wiring detection method according to claim 1, further comprising:
and outputting fault information when the temperature value does not meet the pin wiring error of the temperature sensor and the ECU corresponding to the temperature relationship.
7. The wiring detection method according to claim 1, further comprising, after determining that the temperature value does not satisfy the pin wiring error between the temperature sensor and the ECU corresponding to the temperature relationship,:
and correcting the connection relation between the pins of the ECU and the temperature sensors according to the temperature values measured by the temperature sensors and the temperature relation of the temperature sensors.
8. The wiring detection method according to claim 7, further comprising:
and storing the corrected connection relation between the pins of the ECU and the temperature sensors in the ECU, automatically reading the corrected connection relation between the pins of the ECU and the temperature sensors when the ECU is electrified again, and connecting the pins of the ECU and the temperature sensors.
9. A wiring detection device for detecting pin wiring of at least two temperature sensors of an aftertreatment system with an electronic control unit ECU, comprising:
the control module is used for controlling the engine to operate for a preset time under a preset working condition;
the acquisition module is used for acquiring the temperature value measured by each temperature sensor;
and the judging module is used for detecting whether the measured temperature value meets the temperature relationship of the temperature sensor under the preset working condition, and judging that the temperature sensor corresponding to the temperature value which does not meet the temperature relationship and the pin wiring of the ECU are wrong when any temperature value which does not meet the temperature relationship is detected.
10. The wiring detection device of claim 9, further comprising:
and the wiring detection switch is used for triggering the control module to execute the operation of controlling the engine to continuously run for the preset time under the preset working condition when a user presses the wiring detection switch.
11. The wiring detection device of claim 9, further comprising:
the detection module is used for detecting whether each temperature sensor fails or not;
and the control module is also used for controlling the whole vehicle state to be in a temperature sensor wiring detection state if each temperature sensor is judged to be free of faults.
12. The wiring detection device according to claim 11, wherein the temperature sensor wiring detection state includes:
the current accelerator opening is 0;
the vehicle speed is 0;
the engine speed is at idle and the duration exceeds a set value.
13. The wiring detection device of claim 9, wherein the aftertreatment system comprises a diesel oxidation catalyst DOC, a particulate trap DPF, a selective catalytic reduction SCR device, the number of the temperature sensors is four, including a DOC front temperature sensor, a DPF front temperature sensor, an SCR front temperature sensor, and an SCR rear temperature sensor;
the control engine continuously operates for a preset time under a preset working condition comprises the following steps:
controlling the opening degree of a throttle valve of the engine to be a preset opening degree;
controlling the rotating speed of the engine to be a preset rotating speed;
and controlling the DPF to perform fuel injection for a preset time.
14. The wiring detection device of claim 9, further comprising:
and the output module is used for outputting fault information when the temperature sensor corresponding to the temperature relation and the pin wiring error of the ECU are judged that the temperature value does not meet the temperature relation.
15. The wiring detection device according to claim 9, further comprising a correction module configured to, when it is determined that the temperature value does not satisfy the pin wiring error between the temperature sensor and the ECU corresponding to the temperature relationship, correct the connection relationship between the pin of the ECU and each of the temperature sensors according to the temperature value measured by each of the temperature sensors and the temperature relationship between each of the temperature sensors.
16. The wiring detection device of claim 15, further comprising:
and the storage module is used for storing the corrected corresponding relation between the pins of the ECU and the temperature sensors in the ECU, automatically reading the corrected connection relation between the pins of the ECU and the temperature sensors when the ECU is electrified again, and connecting the pins of the ECU and the temperature sensors.
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| CN110231537B (en) * | 2019-06-29 | 2021-10-29 | 潍柴动力股份有限公司 | Method and device for detecting pin error configuration of ECU (electronic control Unit) |
| CN110295985B (en) * | 2019-06-30 | 2020-07-28 | 潍柴动力股份有限公司 | Method and device for detecting removal of diesel oxidation catalyst |
| CN110925067B (en) * | 2019-12-11 | 2021-12-21 | 潍柴动力股份有限公司 | Temperature sensor misloading detection method and device and engine post-processing system |
| CN112697311B (en) * | 2020-12-23 | 2022-10-28 | 潍柴动力股份有限公司 | Mounting detection method and device for post-treatment exhaust temperature sensor |
| CN112729581B (en) * | 2020-12-28 | 2022-06-28 | 潍柴动力股份有限公司 | Temperature detection method and device |
| CN112986863B (en) * | 2021-02-04 | 2024-04-12 | 三一重能股份有限公司 | Line detection method and device of temperature detection system and electronic equipment |
| CN113915014B (en) * | 2021-09-22 | 2023-08-18 | 潍柴动力股份有限公司 | Method for detecting intake air amount MAF of engine and controller of engine |
| CN114658525A (en) * | 2022-03-22 | 2022-06-24 | 潍柴动力股份有限公司 | Method and device for determining sensor fault in HC injection system |
| CN114876616B (en) * | 2022-04-11 | 2023-03-21 | 潍柴动力股份有限公司 | Fault detection and processing method of engine tail gas processing system |
| CN115950470B (en) * | 2022-12-20 | 2024-04-19 | 陕西宝成航空仪表有限责任公司 | Sensor function self-checking circuit |
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| CN102033185A (en) * | 2009-09-24 | 2011-04-27 | 浙江省电力公司 | Method for judging wrong wiring of electric energy meter based on apparent power estimation |
| CN103487696B (en) * | 2013-09-26 | 2015-11-11 | 长城汽车股份有限公司 | A kind of busbar temperature rise method for evaluating consistency and device |
| CN204028693U (en) * | 2014-07-24 | 2014-12-17 | 武汉市菱电汽车电子有限责任公司 | A kind of function detection device of automobile electronic fuel oil jet system electronic control unit |
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