CN113009903A - Fault diagnosis method and device, vehicle and storage medium - Google Patents
Fault diagnosis method and device, vehicle and storage medium Download PDFInfo
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- CN113009903A CN113009903A CN202110199584.XA CN202110199584A CN113009903A CN 113009903 A CN113009903 A CN 113009903A CN 202110199584 A CN202110199584 A CN 202110199584A CN 113009903 A CN113009903 A CN 113009903A
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
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Abstract
The invention discloses a fault diagnosis method, a fault diagnosis device, a vehicle and a storage medium, wherein the method comprises the following steps: acquiring a vehicle state; and when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system. The embodiment of the invention automatically simulates the actual working process of the urea system, and carries out fault troubleshooting by gradually positioning the fault generation stage, so as to realize quick and accurate fault location troubleshooting, improve the fault maintenance accuracy and shorten the fault maintenance time.
Description
Technical Field
The embodiment of the invention relates to a computer detection technology, in particular to a fault diagnosis method, a fault diagnosis device, a vehicle and a storage medium.
Background
With the continuous upgrading of vehicle emission control technologies, Selective Catalytic Reduction (SCR) becomes the most common aftertreatment control technology, the core of SCR is to control the injection of urea, and the precondition of normal urea injection is that a urea system has a pressure normally established and maintained, so as to complete the accurate injection of the urea system. The urea pressure building system comprises a plurality of related switches, sensors, electromagnetic valves and related gas circuits, and pressure building failure can be caused when any part is abnormal. The urea system pressure building failure fault has many related possible reasons and no special detection equipment is used for special detection, and once the fault occurs, maintenance personnel can not simulate the urea system pressure building process to accurately judge the fault position, so that the purpose of investigation is poor, the steps are disordered, and the misjudgment rate is high. In the after-sale maintenance process, the fault processing time is long, and parts are easy to replace by mistake, so that the waste of operation time and the increase of maintenance cost are caused to users.
Disclosure of Invention
The invention provides a fault diagnosis method, a fault diagnosis device, a vehicle and a storage medium, which are used for realizing the step-by-step fault generation positioning stage through step-by-step simulation, and prompting a user of possible fault reasons and a troubleshooting method through an interactive process with the user, so that the automatic detection, step-by-step inspection and step-by-step troubleshooting are completed, and further, the method for quickly locking the fault and searching the true cause is realized. The novel detection method can improve the fault maintenance efficiency, the satisfaction degree of customers and the accuracy rate of fault maintenance, so that the claim error rate caused by misjudgment is greatly reduced.
In a first aspect, an embodiment of the present invention provides a fault diagnosis method, where the method includes:
acquiring a vehicle state; and when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
Further, the determining whether the urea pressure building system is normal according to the pressure building capacity and the pressure maintaining capacity of the urea pressure building system includes:
the pressure maintaining capacity and the pressure building capacity of the urea pressure building system reach the standard, and the urea pressure building system is normal; and if at least one of the pressure maintaining capacity and the pressure building capacity of the urea pressure building system does not reach the standard, the urea pressure building system is abnormal.
Further, the method further comprises:
if the pressure building capability of the urea pressure building system does not reach the standard, and an exhaust valve switch and a filter switch of the urea pressure building system are respectively in a closed state and an air inlet valve switch is in an open state, determining the connection state of an air inlet connecting pipe and an exhaust connecting pipe;
and if the connection of the air inlet connecting pipe and the exhaust connecting pipe is normal, and the urea cover is intact and screwed down, replacing the urea pressure sensor.
Further, the method further comprises:
and if the pressure maintaining capacity of the urea pressure building system does not reach the standard, the exhaust valve switch and the air inlet valve switch of the urea pressure building system are respectively in a closed state, and the exhaust valve, the exhaust connecting pipe, the air inlet valve and the air inlet pipe connecting pipe are not leaked, the state of the urea cover is determined.
Further, the method further comprises:
the vehicle is in a power-on state, and the first air pressure value of the vehicle air storage cylinder does not meet the pressure building condition of the urea pressure building system, and then the vehicle is started;
after the vehicle is started for a preset time, if the second air pressure value of the vehicle air cylinder is equal to the first air pressure value, and the air cylinder pressure sensor wire harness is normally used, the air cylinder pressure sensor is replaced.
Further, the method further comprises:
after the vehicle is started for a preset time, if the second air pressure value of the vehicle air reservoir meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
Further, the acquiring the vehicle state includes:
determining the position of an ignition switch of the current vehicle according to the voice prompt;
and if the ignition switch is not in the ON gear, the position of the ignition switch is placed in the ON gear.
In a second aspect, an embodiment of the present invention further provides a fault diagnosis apparatus, including:
the state acquisition module is used for acquiring the state of the vehicle;
and the abnormity determining module is used for determining whether the urea pressure building system is normal or not according to the pressure building capacity and the pressure maintaining capacity of the urea pressure building system when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system.
In a third aspect, an embodiment of the present invention further provides a vehicle, including:
the urea pressure building system is used for building urea pressure in the urea box;
one or more processors;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the fault diagnosis method.
In a fourth aspect, the embodiments of the present invention further provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are used for executing the fault diagnosis method
The invention obtains the vehicle state; the vehicle is in a power-on state, the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, whether the urea pressure building system is normal or not is determined according to the pressure building capacity and the pressure maintaining capacity of the urea pressure building system, the problem that the troubleshooting fault is disordered and the judgment error rate is high due to the fact that the fault stage cannot be judged when abnormality occurs in the urea system pressure building process is solved, the actual working process of the automatic simulation urea system is achieved, fault troubleshooting is conducted by gradually positioning the fault generation stage, the fault location is rapidly and accurately positioned to conduct fault troubleshooting, and the technical effects of improving the fault maintenance accuracy and shortening the fault maintenance time are achieved.
Drawings
Fig. 1 is a flow chart of a fault diagnosis method according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a fault diagnosis method according to a second embodiment of the present invention;
FIG. 2a is a schematic diagram of relevant components and a diagnostic instrument of a urea pressure build-up system in an embodiment of the invention;
FIG. 2b is a flow chart of a fault diagnosis method according to a second embodiment of the present invention;
fig. 3 is a structural diagram of a failure diagnosis apparatus in a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a vehicle according to a fourth 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.
Example one
Fig. 1 is a flowchart of a fault diagnosis method provided in an embodiment of the present invention, where the embodiment is applicable to a situation where a vehicle urea pressure buildup system needs to be troubleshooting, and the method may be executed by a fault diagnosis device or a vehicle, and specifically includes the following steps:
step S110, obtaining a vehicle state;
in the embodiment of the invention, the vehicle state can be understood as a state corresponding to the position of the vehicle ignition switch. The general vehicle ignition switch has four gears of START, ACC, ON and LOCK, wherein the START gear is also called as a vehicle starting gear, and is the position of the vehicle ignition switch in the vehicle starting process; the ACC gear is the position of a vehicle ignition switch when other accessories of the vehicle are electrified; the ON gear is the position of a vehicle ignition switch when all electrical elements of the vehicle are electrified; the LOCK gear is also called as a locking gear of the vehicle, and all circuit equipment of the vehicle except the anti-theft alarm system is closed when an ignition switch of the vehicle is positioned.
In the embodiment of the invention, when the vehicle ignition switch is in an ON gear, the vehicle state corresponds to two conditions: the ignition switch of the vehicle is in an ON gear before the vehicle is started, only all electrical elements of the vehicle are electrified, and the vehicle does not have a driving condition; the other is that the ignition switch returns to the ON gear from the START gear after the vehicle is started, namely the position of the ignition switch of the vehicle is positioned during the running process of the vehicle.
In the embodiment of the invention, the vehicle state is acquired, namely the state corresponding to the position of the vehicle ignition switch is acquired. The vehicle ignition switch is in a START gear, and the vehicle is correspondingly in a starting state; the vehicle ignition switch is in an ACC gear, and the vehicle is correspondingly in an accessory power-on state; the vehicle ignition switch is in the ON position. The vehicle is correspondingly in a power-on state; the vehicle ignition switch is in LOCK gear, and the vehicle is correspondingly in a locking state.
And S120, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system.
In the embodiment of the invention, the vehicle air storage cylinder can be understood as a gas which is compressed by an air compressor, namely an air pump, and is used for an automobile braking system, a whistle system, a urea pressure building system and the like. The first air pressure value of the vehicle air reservoir is the corresponding air pressure value of the current vehicle air reservoir. The urea pressure build-up capability may be understood as the capability of the urea pressure build-up system to build up urea pressure. The urea pressure maintaining capacity can be understood as the capacity of the urea pressure build-up system to maintain a preset standard urea pressure within a certain range. Wherein, the urea pressure is the pressure value of urea liquid in a urea tank in the urea pressure building system.
In the embodiment of the invention, when the vehicle is in a power-ON state, namely the ignition switch of the vehicle is in an ON gear, all electrical components of the vehicle are powered ON, and the first air pressure value of the current vehicle air storage cylinder reaches a preset pressure value, the pressure building condition of the vehicle urea pressure building system is met. And after the pressure building condition of the urea pressure building system is met, detecting the urea pressure building system in the pressure building stage. The detection of the urea pressure building system during pressure building mainly aims at the capability of the urea pressure value of the urea pressure building system reaching the preset standard urea pressure value of the urea pressure building system and the capability of maintaining the preset standard pressure value of the urea pressure building system.
In the embodiment of the invention, the diagnosis of the fault of the urea pressure building system is divided into three stages: before the urea pressure building system builds the pressure, when the urea pressure building system builds the pressure, and after the urea pressure building system builds the pressure. Before the urea pressure building system builds pressure, the vehicle state and the first air pressure value of the vehicle air cylinder need to be detected, and whether the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea system or not is checked. The urea pressure build-up system requires a detection of the ability of the urea pressure build-up system to build urea pressure at pressure build-up. The urea pressure build-up system requires a detection of the ability of the urea pressure build-up system to maintain urea pressure after pressure build-up.
Further, the determining whether the urea pressure building system is normal according to the pressure building capacity and the pressure maintaining capacity of the urea pressure building system includes:
the pressure maintaining capacity and the pressure building capacity of the urea pressure building system reach the standard, and the urea pressure building system is normal; and if at least one of the pressure maintaining capacity and the pressure building capacity of the urea pressure building system does not reach the standard, the urea pressure building system is abnormal.
In the embodiment of the invention, if the urea pressure building capacity of the urea pressure building system can exceed the preset standard urea pressure, the pressure building capacity of the urea pressure building system reaches the standard; and if the urea pressure building capacity of the urea pressure building system cannot exceed the preset standard urea pressure, the urea pressure building capacity of the urea pressure building system cannot reach the standard.
In the embodiment of the invention, if the urea pressure of the urea pressure building system is maintained within a certain range, the pressure maintaining capacity of the urea pressure building system reaches the standard; and if the pressure of the urea pressure building system can not be maintained within a certain range, the pressure maintaining capacity of the urea pressure building system does not reach the standard.
In the embodiment of the invention, on the basis of meeting the pressure building condition of the urea pressure building system, the pressure building capacity of the urea pressure building system during pressure building and the pressure maintaining capacity of the urea pressure building system after pressure building are required to be detected. If the urea pressure value can reach the preset standard urea pressure when the urea pressure building system builds the pressure, and the urea pressure value can be maintained in a certain range by the urea pressure building system, the urea pressure building system is normal. If the urea pressure building system is normal and the vehicle Diagnostic system (OBD) displays the fault code, the urea pressure building system of the vehicle needs to be subjected to the cycle diagnosis for the preset times through the vehicle Diagnostic system. And if the vehicle diagnosis system finishes the preset times of circular diagnosis and displays no fault, the fault code is automatically eliminated, and the fault troubleshooting is finished.
Further, the method also comprises the following steps:
if the pressure building capability of the urea pressure building system does not reach the standard, and an exhaust valve switch and a filter switch of the urea pressure building system are respectively in a closed state and an air inlet valve switch is in an open state, determining the connection state of an air inlet connecting pipe and an exhaust connecting pipe;
and if the connection of the air inlet connecting pipe and the exhaust connecting pipe is normal, and the urea cover is intact and screwed down, replacing the urea pressure sensor.
In the embodiment of the invention, the exhaust valve of the urea pressure buildup system can be understood as a valve correspondingly arranged on a urea box of the urea pressure buildup system or an exhaust pipe of the urea pressure buildup system and used for reducing the air pressure in the urea box of the urea pressure buildup system. The air inlet valve of the urea pressure buildup system can be understood as a valve which is correspondingly arranged on a urea box of the urea pressure buildup system or an air inlet pipe of the urea pressure buildup system and is used for increasing and controlling air pressure in the urea pressure buildup system. The filter of the urea pressure buildup system can be understood as an air inlet filter of the urea pressure buildup system, and is used for filtering impurities or dust in air and reducing air inlet noise. The inlet connection pipe can be understood as a pipe connecting the vehicle air reservoir and the urea tank; the exhaust connection pipe may be understood as a pipe connecting the urea tank with the outside. The urea cover can be understood as a sealing cover on the opening of the urea tank corresponding to the urea injection, and is used for sealing the urea tank. A urea pressure sensor may be understood as a sensor that detects the pressure of urea in the urea tank.
In the embodiment of the invention, if the pressure building capacity of the urea pressure building system does not reach the standard, whether relevant parts have faults or not during pressure building of the urea pressure building system needs to be detected. When the pressure build-up of the urea pressure build-up system needs to be detected, whether an air inlet valve and a filter are in an open state, an exhaust valve is in a closed state, and whether the connection of an air inlet connecting pipe and an exhaust connecting pipe is correct; and further detecting whether the urea cover on the urea box is intact and screwed. If all the components have no faults, the urea pressure sensor has faults and needs to be replaced.
In the embodiment of the invention, when the urea pressure building system builds the pressure, an air inlet valve of the urea pressure building system is in an open state and is used for conveying gas to the urea tank to increase the pressure value of the urea. An exhaust valve of the urea pressure buildup system should be in a closed state for sealing the urea tank. The inlet filter of the urea pressure buildup system should be in an open state for filtering impurities in the gas.
Further, the method further comprises:
and if the pressure maintaining capacity of the urea pressure building system does not reach the standard, an exhaust valve switch and an intake valve switch of the urea pressure building system are respectively in a closed state, and the exhaust valve, the exhaust connecting pipe, the intake valve and the intake connecting pipe are not leaked, determining the state of the urea cover.
In the embodiment of the invention, after the urea pressure building system builds the pressure, the air inlet valve of the urea pressure building system is in a closed state, and when the urea pressure of the urea pressure building system reaches the preset standard pressure, the urea pressure stops being conveyed to the urea box. An exhaust valve of the urea pressure buildup system is in a closed state, and the exhaust valve, the exhaust connecting pipe, the intake valve, the periphery of the intake connecting pipe and a connector of the urea pressure buildup system are used for sealing the urea box without leakage.
In the embodiment of the invention, after the urea pressure of the urea pressure building system reaches the preset standard pressure value, the urea pressure building system closes an air inlet valve of the urea pressure building system, gas is stopped being conveyed into a urea box, the urea pressure building system enters a pressure maintaining state, if the urea pressure of the urea pressure building system is reduced, pressure maintaining related parts of the urea pressure building system are in failure, and whether the pressure maintaining related parts of the urea pressure building system are in failure needs to be detected. And if the exhaust valve switch and the air inlet valve switch of the urea pressure building system are respectively in a closed state and the exhaust valve, the exhaust connecting pipe, the air inlet valve and the air inlet connecting pipe are not leaked, the urea cover on the urea box of the urea pressure building system is not screwed down, and whether gas leakage exists around the non-screwed urea cover is detected.
The invention obtains the vehicle state; the vehicle is in a power-on state, the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, whether the urea pressure building system is normal or not is determined according to the pressure building capacity and the pressure maintaining capacity of the urea pressure building system, the problem that the troubleshooting fault is disordered and the judgment error rate is high due to the fact that the fault stage cannot be judged when abnormality occurs in the urea system pressure building process is solved, the actual working process of the automatic simulation urea system is achieved, fault troubleshooting is conducted by gradually positioning the fault generation stage, the fault location is rapidly and accurately positioned to conduct fault troubleshooting, and the technical effects of improving the fault maintenance accuracy and shortening the fault maintenance time are achieved.
Example two
Fig. 2 is a flowchart of a fault diagnosis method provided in the second embodiment of the present invention, and the technical solution of the second embodiment of the present invention is further detailed on the basis of the technical solution of the first embodiment, and specifically includes the following steps:
step 210, obtaining a vehicle state;
step S220, the vehicle is in a power-on state, and the first air pressure value of the vehicle air reservoir does not meet the pressure building condition of a urea pressure building system, and then the vehicle is started; after the vehicle is started for a preset time, if the second air pressure value of the vehicle air cylinder is equal to the first air pressure value, and the air cylinder pressure sensor wire harness is normally used, the air cylinder pressure sensor is replaced.
In the embodiment of the invention, the second air pressure value of the air storage cylinder of the vehicle can be understood as the detected air pressure value of the air storage cylinder after the pressure building condition of the urea pressure building system is not met and the vehicle is started to be preset. The preset duration can be understood as the interval time for detecting the air pressure value of the air reservoir of the vehicle after the vehicle is started. The preset pressure value can be understood as the urea pressure value reached when the urea pressure building system is successfully built. The air cylinder pressure sensor wire harness can be understood as a wire harness for connecting other components with the air cylinder, is used for electrifying the air cylinder pressure sensor and transmitting information collected by the sensor to the processor. The air cylinder pressure sensor can be understood as a sensor for collecting the pressure value in the air cylinder.
In the embodiment of the invention, when the vehicle is in a power-ON state, namely the ignition switch of the vehicle is in an ON gear, all electrical components of the vehicle are powered ON, and the current first air pressure value of the air storage cylinder of the vehicle does not reach the preset pressure value, the pressure building condition of the urea pressure building system of the vehicle is not met. And after the vehicle is started and the position of the ignition switch of the vehicle is an ON gear, continuously detecting a second air pressure value of the current air storage cylinder at preset intervals. If the second air pressure value of the vehicle air reservoir is equal to the second air pressure value of the air reservoir, the air pressure before and after the air reservoir is started does not change, and the air reservoir pressure sensor wire harness needs to be detected; if the air cylinder pressure sensor wire harness is normally used, the air cylinder pressure sensor fails, and the air cylinder pressure sensor needs to be replaced.
Further, the method further comprises:
after the vehicle is started for a preset time, if the second air pressure value of the vehicle air reservoir meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
In the embodiment of the invention, after the vehicle is started for a preset time, the second air pressure value of the vehicle air reservoir is acquired through the air reservoir pressure sensor, and if the second air pressure value of the vehicle air reservoir meets the pressure building condition of the urea pressure building system and meets the pressure building condition of the urea pressure building system, the detection of the urea pressure building system in the pressure building stage is started. The detection of the urea pressure building system during pressure building mainly aims at the capability of the urea pressure value of the urea pressure building system reaching the preset standard urea pressure value of the urea pressure building system and the capability of maintaining the preset standard pressure value of the urea pressure building system.
In the embodiment of the invention, a first air pressure value of the air storage cylinder does not meet the pressure build-up condition of the urea system, and a second air pressure value of the air storage cylinder is collected after a preset time length after a vehicle is started; and comparing the first air pressure value with the second air pressure value of the air storage cylinder, and if the second air pressure value is greater than the first air pressure value and meets the pressure building condition of the urea pressure building system, restarting to detect the pressure building capability and the pressure maintaining capability of the urea pressure building system.
Further, after acquiring the vehicle state, the method further includes:
determining the position of an ignition switch of the current vehicle according to the voice prompt;
and if the ignition switch is not in the ON gear, the position of the ignition switch is placed in the ON gear.
In the embodiment of the present invention, the voice prompt may be understood as a voice prompt that a component or a processor corresponding to the fault diagnosis starts to perform the fault diagnosis process, for example: the voice prompt is "please confirm whether the current vehicle is in a power-on state". And the maintenance personnel determines whether the current position of the ignition switch of the vehicle is in an ON gear or not according to the voice prompt, and if the position of the ignition switch of the vehicle is not in the ON gear, the position of the ignition switch is set to the ON gear so as to facilitate the vehicle to be in a power-ON state for the next detection.
The urea pressure building system fault diagnosis process can be realized in various ways, and specifically comprises the following steps:
fig. 2a is a schematic diagram of relevant components of a urea pressure buildup system and a diagnostic apparatus in an embodiment of the invention, and as shown in fig. 2a, relevant components involved in a fault diagnosis process of the urea pressure buildup system include a urea pressure sensor, an intake valve of the urea pressure buildup system, an exhaust valve of the urea pressure buildup system, an engine control unit ECU, the diagnostic apparatus, a vehicle diagnostic system OBD and a urea nozzle. The diagnostic instrument is connected with an OBD diagnostic interface clearance CAN bus, and the other end of the OBD diagnostic interface is connected with an engine control unit ECU; the engine control unit ECU is respectively linked with a urea pressure sensor, an air inlet valve of a urea pressure building system, an exhaust valve of the urea pressure building system, a urea nozzle and other related components. The diagnosis process flow based ON the urea pressure building system of the related components is shown in fig. 2b, fault diagnosis is started, a maintenance worker detects whether a vehicle ignition switch is in an ON gear and whether a first air pressure value of a vehicle air storage cylinder meets the pressure building condition of the urea pressure building system according to voice prompt content of a diagnostic instrument, if the first air pressure value of the air storage cylinder displayed by a vehicle instrument does not meet requirements, the vehicle is started to inflate, after the vehicle is started for a preset time, whether a second air pressure value of the air storage cylinder after the vehicle is started is larger than the first air pressure value is determined, and if the second air pressure value of the air storage cylinder is larger than the first air pressure value, whether the second air pressure value of the air storage cylinder meets the pressure building condition of the urea pressure building system is detected again. If the second air pressure value of the vehicle air reservoir is confirmed to be equal to the first air pressure value after the vehicle is started for a preset time, the following steps of troubleshooting are carried out, namely, whether the wire harness of the air reservoir pressure sensor can be normally used is detected, and if the wire harness of the air reservoir pressure sensor can be normally used, the air reservoir pressure sensor is replaced. If the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, automatically completing the pressure building capacity of the urea pressure building system through a diagnostic instrument, realizing logic of driving an exhaust valve of the urea pressure building system to close and an intake valve of the urea pressure building system to open, judging whether the urea pressure exceeds a preset standard pressure value according to the signal input of a pressure sensor within a preset time, automatically completing the pressure maintaining capacity detection of the urea pressure building system through the diagnostic instrument if the urea pressure exceeds the preset standard pressure value, realizing logic of driving the exhaust valve to close and the intake valve to open, driving the intake valve to close after detecting that the urea pressure reaches the preset standard pressure value, judging whether the urea pressure is stabilized within a preset value range within the preset time, and if the urea pressure is within the preset value range, normally building the urea pressure and keeping the urea pressure by the urea system, and according to the voice prompt of the diagnostic instrument, whether three OBD (on-board diagnostics) cycles pass or not after the fault reason of the fault code is confirmed to be repaired meets the condition of automatic fault code clearing. And whether the troubleshooting fault code is eliminated or not is checked, and the troubleshooting process is finished. If the urea pressure of the urea pressure building system cannot be stabilized within a preset value range, troubleshooting is carried out according to the following steps: and detecting whether an exhaust valve switch and an intake valve switch of the urea pressure-building system are in a closed state and whether the exhaust valve, the exhaust connecting pipe, the intake valve and the intake connecting pipe are leaked, and if the exhaust valve switch and the intake valve switch of the urea pressure-building system are in the closed state and the exhaust valve, the exhaust connecting pipe, the intake valve and the intake connecting pipe are not leaked, determining the state of a urea cover. The status of the urea cap is determined. (ii) a If the urea pressure does not exceed the preset standard pressure value, carrying out troubleshooting according to the following steps: detecting whether an air inlet valve switch and a filter switch of the urea pressure building system are in an open state, whether an exhaust valve switch is in a closed state, whether an exhaust valve connecting pipe and an air inlet valve connecting pipe are normally connected and whether a urea cover is intact or screwed, and if so, detecting that the urea pressure sensor fails and replacing a new urea pressure sensor.
The invention obtains the vehicle state; the vehicle is in a power-on state, the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, whether the urea pressure building system is normal or not is determined according to the pressure building capacity and the pressure maintaining capacity of the urea pressure building system, the problem that the troubleshooting fault is disordered and the judgment error rate is high due to the fact that the fault stage cannot be judged when abnormality occurs in the urea system pressure building process is solved, the actual working process of the automatic simulation urea system is achieved, fault troubleshooting is conducted by gradually positioning the fault generation stage, the fault location is rapidly and accurately positioned to conduct fault troubleshooting, and the technical effects of improving the fault maintenance accuracy and shortening the fault maintenance time are achieved.
EXAMPLE III
Fig. 3 is a fault diagnosis apparatus provided in an embodiment of the present invention, where the apparatus includes: a state acquisition module 31, an abnormality determination module 32;
a state acquisition module 31 for acquiring a vehicle state;
and the abnormity determining module 32 is used for determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system when the vehicle is in a power-on state and the first air pressure value of the vehicle air reservoir meets the pressure building condition of the urea pressure building system.
Further, the anomaly determination module 32 is specifically configured to:
the pressure maintaining capacity and the pressure building capacity of the urea pressure building system reach the standard, and the urea pressure building system is normal; and if at least one of the pressure maintaining capacity and the pressure building capacity of the urea pressure building system does not reach the standard, the urea pressure building system is abnormal.
Further, the anomaly determination module 32 is specifically further configured to:
if the pressure building capability of the urea pressure building system does not reach the standard, and an exhaust valve switch and a filter switch of the urea pressure building system are respectively in a closed state and an air inlet valve switch is in an open state, determining the connection state of an air inlet connecting pipe and an exhaust connecting pipe;
and if the connection of the air inlet connecting pipe and the exhaust connecting pipe is normal, and the urea cover is intact and screwed down, replacing the urea pressure sensor.
Further, the anomaly determination module 32 is specifically further configured to:
and if the pressure maintaining capacity of the urea pressure building system does not reach the standard, an exhaust valve switch and an intake valve switch of the urea pressure building system are respectively in a closed state, and the exhaust valve, the exhaust connecting pipe, the intake valve and the intake connecting pipe are not leaked, determining the state of the urea cover.
Further, the anomaly determination module 32 is specifically further configured to:
the vehicle is in a power-on state, and the first air pressure value of the vehicle air storage cylinder does not meet the pressure building condition of the urea pressure building system, and then the vehicle is started;
after the vehicle is started for a preset time, if the second air pressure value of the vehicle air cylinder is equal to the first air pressure value, and the air cylinder pressure sensor wire harness is normally used, the air cylinder pressure sensor is replaced.
Further, the anomaly determination module 32 is specifically further configured to:
after the vehicle is started for a preset time, if the second air pressure value of the vehicle air reservoir meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
Further, the state obtaining module 31 is specifically further configured to:
determining the position of an ignition switch of the current vehicle according to the voice prompt;
and if the ignition switch is not in the ON gear, the position of the ignition switch is placed in the ON gear.
The fault diagnosis device provided by the embodiment of the invention can execute the fault diagnosis method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 4 is a schematic structural diagram of a vehicle according to embodiment 4 of the present invention. FIG. 4 illustrates a block diagram of an exemplary vehicle 12 suitable for use in implementing embodiments of the present invention. The vehicle 12 shown in fig. 4 is only an example and should not impose any limitation on the functionality and scope of use of embodiments of the present invention.
As shown in FIG. 4, the vehicle 12 is embodied in the form of a general purpose computing device. The components of the vehicle 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
The vehicle 12 typically includes a variety of computer system readable media. These media may be any available media that is accessible by the vehicle 12 and includes both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. The vehicle 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, and commonly referred to as a "hard drive"). Although not shown in FIG. 4, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
The vehicle 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with the vehicle 12, and/or with any devices (e.g., network card, modem, etc.) that enable the vehicle 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Also, the vehicle 12 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet) via the network adapter 20. As shown, the network adapter 20 communicates with other modules of the vehicle 12 via the bus 18. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the vehicle 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 16 executes various functional applications and data processing by executing programs stored in the system memory 28, for example, to implement a fault diagnosis method provided by an embodiment of the present invention, the method including: acquiring a vehicle state;
and when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are executed by a computer processor to perform a fault diagnosis method, where the method includes:
acquiring a vehicle state;
and when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
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 (10)
1. A fault diagnosis method, comprising:
acquiring a vehicle state;
and when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
2. The method of claim 1, wherein the determining whether the urea pressure buildup system is normal based on a pressure buildup capability and a pressure holding capability of the urea pressure buildup system comprises:
the pressure maintaining capacity and the pressure building capacity of the urea pressure building system reach the standard, and the urea pressure building system is normal;
and if at least one of the pressure maintaining capacity and the pressure building capacity of the urea pressure building system does not reach the standard, the urea pressure building system is abnormal.
3. The method of claim 2, further comprising:
if the pressure building capability of the urea pressure building system does not reach the standard, and an exhaust valve switch and a filter switch of the urea pressure building system are respectively in a closed state and an air inlet valve switch is in an open state, determining the connection state of an air inlet connecting pipe and an exhaust connecting pipe;
and if the connection of the air inlet connecting pipe and the exhaust connecting pipe is normal, and the urea cover is intact and screwed down, replacing the urea pressure sensor.
4. The method of claim 2, further comprising:
and if the pressure maintaining capacity of the urea pressure building system does not reach the standard, an exhaust valve switch and an intake valve switch of the urea pressure building system are respectively in a closed state, and the exhaust valve, the exhaust connecting pipe, the intake valve and the intake connecting pipe are not leaked, determining the state of the urea cover.
5. The method of claim 1, further comprising:
the vehicle is in a power-on state, and the first air pressure value of the vehicle air storage cylinder does not meet the pressure building condition of the urea pressure building system, and then the vehicle is started;
after the vehicle is started for a preset time, if the second air pressure value of the vehicle air cylinder is equal to the first air pressure value, and the air cylinder pressure sensor wire harness is normally used, the air cylinder pressure sensor is replaced.
6. The method of claim 5, further comprising:
after the vehicle is started for a preset time, if the second air pressure value of the vehicle air reservoir meets the pressure building condition of the urea pressure building system, determining whether the urea pressure building system is normal or not according to the pressure building capability and the pressure maintaining capability of the urea pressure building system.
7. The method of claim 1, wherein after obtaining the vehicle state, further comprising:
determining the position of an ignition switch of the current vehicle according to the voice prompt; and if the ignition switch is not in the ON gear, the position of the ignition switch is placed in the ON gear.
8. A failure diagnosis device characterized by comprising:
the state acquisition module is used for acquiring the state of the vehicle;
and the abnormity determining module is used for determining whether the urea pressure building system is normal or not according to the pressure building capacity and the pressure maintaining capacity of the urea pressure building system when the vehicle is in a power-on state and the first air pressure value of the vehicle air cylinder meets the pressure building condition of the urea pressure building system.
9. A vehicle, characterized in that the vehicle comprises:
the urea pressure building system is used for building urea pressure in the urea box;
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the fault diagnosis method of any one of claims 1-7.
10. A storage medium containing computer-executable instructions for performing the fault diagnosis method of any one of claims 1-7 when executed by a computer processor.
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