Vehicle and its maintenance method

Abstract

The present invention discloses a vehicle and its maintenance method. The method includes: obtaining the exhaust gas temperature in front of the DPF, engine speed, vehicle speed, ambient temperature, and atmospheric pressure; obtaining the time-integrated carbon loading based on the exhaust gas temperature in front of the DPF, engine speed, ambient temperature, and atmospheric pressure; obtaining the mileage-integrated carbon loading based on the exhaust gas temperature in front of the DPF, vehicle speed, ambient temperature, and atmospheric pressure; and when the sum of the time-integrated carbon loading and the mileage-integrated carbon loading is greater than the first carbon loading threshold, giving a parking regeneration reminder to the user so that the user can perform parking regeneration according to the parking regeneration reminder. Thereby, the intelligence and accuracy of vehicle maintenance can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle maintenance, and particularly to a vehicle maintenance method and a vehicle. Background Art

[0002] With the release and implementation of the national VI emission regulations for diesel commercial vehicles, the national VI technical routes in the automotive industry have basically been unified. The main technical route is the diesel high-pressure common rail electronic control system + EGR (Exhaust Gas Re-circulation) + DOC (Diesel Oxidation Catalyst) + DPF (Diesel Particulate Filter) + SCR (Selective Catalytic Reduction) + ASC (Ammonia Slip Catalyst). Compared with the commercial vehicles meeting the national V emission standards, the national VI emission commercial vehicles mainly add the EGR system and the DPF aftertreatment. These two systems play the role of optimizing combustion, trapping particulate matters such as soot and non-combustible ash, so as to reduce the pollution to the atmosphere.

[0003] As the vehicle keeps running, the soot and ash increase continuously, and the particulate matters such as soot and ash inside the EGR system pipeline and the DPF aftertreatment also increase continuously. When the particulate matters accumulate to a certain extent, it will cause blockage of the EGR system and the DPF aftertreatment. Therefore, regular maintenance or cleaning is required.

[0004] In the related art, the overall vehicle maintenance mainly depends on the vehicle driving mileage and driving time after the user purchases the vehicle. Among them, the driving mileage is the actual driving mileage of the vehicle, and the driving time is the current date minus the purchase date or the last maintenance date. Moreover, the maintenance reminder method is a telephone notice from the service station or the user's own record. This maintenance method is too mechanical, with too low intelligence, and the maintenance reminder is inaccurate. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, the first object of the present invention is to propose a vehicle maintenance method, which can automatically judge whether the vehicle needs DPF parking regeneration and remind the user without manual participation, improving the intelligence of vehicle maintenance. At the same time, it judges whether the vehicle needs DPF parking regeneration based on the time-integrated carbon loading and the mileage-integrated carbon loading, rather than simply the vehicle driving mileage and driving time, improving the accuracy of vehicle maintenance reminder.

[0006] The second object of the present invention is to propose a vehicle.

[0007] To achieve the above object, an embodiment of the first aspect of the present invention provides a vehicle maintenance method, which includes: obtaining the exhaust gas temperature in front of the diesel particulate filter (DPF), the engine speed, the vehicle speed, the ambient temperature, and the atmospheric pressure; obtaining the time-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the engine speed, the ambient temperature, and the atmospheric pressure; obtaining the mileage-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the vehicle speed, the ambient temperature, and the atmospheric pressure; and when the sum of the time-integrated carbon loading and the mileage-integrated carbon loading is greater than the first carbon loading threshold, giving a parking regeneration reminder to the user so that the user can perform parking regeneration according to the reminder.

[0008] According to the vehicle maintenance method of the embodiment of the present invention, by obtaining the time-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the engine speed, the ambient temperature, and the atmospheric pressure, obtaining the mileage-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the vehicle speed, the ambient temperature, and the atmospheric pressure, and giving a parking regeneration reminder to the user when the sum of the time-integrated carbon loading and the mileage-integrated carbon loading is greater than the first carbon loading threshold so that the user can perform parking regeneration according to the reminder, it can automatically determine whether the vehicle needs DPF parking regeneration and remind the user, without manual participation, improving the intelligence of vehicle maintenance. At the same time, based on the time-integrated carbon loading and the mileage-integrated carbon loading to judge whether the vehicle needs DPF parking regeneration, rather than simply the vehicle driving mileage and driving time, improving the accuracy of vehicle maintenance reminder.

[0009] According to an embodiment of the present invention, obtaining the time-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the engine speed, the ambient temperature, and the atmospheric pressure includes: determining a first MAP reference diagram according to the exhaust gas temperature in front of the DPF and the engine speed; obtaining a first carbon accumulation rate from the first MAP reference diagram according to the ambient temperature and the atmospheric pressure; and when the vehicle speed is zero and the engine is in the running state, integrating the engine running time according to the first carbon accumulation rate to obtain the time-integrated carbon loading.

[0010] According to an embodiment of the present invention, obtaining the mileage-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the vehicle speed, the ambient temperature, and the atmospheric pressure includes: determining a second MAP reference diagram according to the exhaust gas temperature in front of the DPF and the vehicle speed; obtaining a second carbon accumulation rate from the second MAP reference diagram according to the ambient temperature and the atmospheric pressure; and when the vehicle speed is greater than zero, integrating the vehicle running mileage according to the second carbon accumulation rate to obtain the mileage-integrated carbon loading.

[0011] According to an embodiment of the present invention, the method further includes: determining an operation time correction coefficient according to the exhaust gas temperature in front of the DPF and the vehicle speed; correcting the engine running time according to the operation time correction coefficient to obtain an operation time correction value; and when the operation time correction value is greater than the operation time threshold, giving a parking regeneration reminder to the user so that the user can perform parking regeneration according to the reminder.

[0012] According to an embodiment of the present invention, the method further includes: determining an operating mileage correction coefficient according to the front temperature of the DPF and the vehicle speed of the whole vehicle; correcting the operating mileage of the whole vehicle according to the operating mileage correction coefficient to obtain an operating mileage correction value; when the operating mileage correction value is greater than the operating mileage threshold, reminding the user of parked vehicle regeneration, so that the user can perform parked vehicle regeneration according to the parked vehicle regeneration reminder.

[0013] According to an embodiment of the present invention, the method further includes: obtaining the status of the DPF indicator light, the front temperature of the oxidation catalytic converter DOC, and the DPF carbon loading; when the DPF indicator light is on, the front temperature of the DOC is greater than the first heating temperature threshold, and the front temperature of the DPF is greater than the second heating temperature threshold, recording the heating time; when the DPF indicator light is on, the front temperature of the DOC is greater than the first regeneration temperature threshold, and the front temperature of the DPF is greater than the second regeneration temperature threshold, recording the regeneration time; when the DPF indicator light is on, and the front temperature of the DPF is greater than the effective regeneration temperature threshold, recording the effective regeneration time; when the DPF indicator light is off, and the DPF carbon loading is greater than or equal to the second carbon loading threshold, recording the interruption time; when the interruption time is greater than the interruption time threshold, if the heating time is greater than the heating time threshold, the regeneration time is greater than the regeneration time threshold, or the effective regeneration time is less than the effective regeneration time threshold, determining that the DPF regeneration fails, and recording the number of regeneration failures; when the number of regeneration failures is greater than the failure number threshold, reminding the user of parked vehicle regeneration, so that the user can perform parked vehicle regeneration according to the parked vehicle regeneration reminder.

[0014] According to an embodiment of the present invention, the method further includes: when the DPF indicator light is off, the DPF carbon loading is less than the second carbon loading threshold, and the effective regeneration time is greater than the effective regeneration time threshold, determining that the DPF regeneration is successful, and recording the number of regeneration successes.

[0015] According to an embodiment of the present invention, the method further includes: obtaining the number of regeneration failures, the number of regeneration successes, the total regeneration duration, the engine operation time, the vehicle operation mileage, the operation time correction value, and the operation mileage correction value during the maintenance period; when any one of the sum of the number of regeneration failures and the number of regeneration successes during the maintenance period, the total regeneration duration during the maintenance period, the engine operation time during the maintenance period, and the vehicle operation mileage during the maintenance period meets a preset condition, reminding the user of oil maintenance; when the operation time correction value during the maintenance period or the operation mileage correction value during the maintenance period meets a preset condition, reminding the user of exhaust gas recirculation EGR maintenance and DPF maintenance.

[0016] According to an embodiment of the present invention, after a parking regeneration reminder, an EGR maintenance reminder, or a DPF maintenance reminder is given to the user, the method further includes: obtaining the running time and running mileage of the whole vehicle; when the user does not perform parking regeneration or maintenance, if the running time and running mileage of the whole vehicle meet the first protection condition, the engine speed and engine torque are restricted at the first level; if the running time and running mileage of the whole vehicle meet the second protection condition, the engine speed and engine torque are restricted at the second level, and the maximum engine speed during the second-level restriction is less than the maximum engine speed during the first-level restriction, and the maximum engine torque during the second-level restriction is less than the maximum engine torque during the first-level restriction.

[0017] To achieve the above object, an embodiment of the second aspect of the present invention provides a vehicle, including a memory, a processor, and a vehicle maintenance program stored on the memory and executable on the processor. When the processor executes the vehicle maintenance program, the vehicle maintenance method proposed in the above-mentioned first aspect embodiment is implemented.

[0018] In the vehicle according to the embodiment of the present invention, when the vehicle maintenance program stored thereon is executed by the processor, by implementing the foregoing vehicle maintenance method, it can automatically determine whether the vehicle needs DPF parking regeneration and remind the user, without manual intervention, improving the intelligence of vehicle maintenance. At the same time, it determines whether the vehicle needs DPF parking regeneration based on the time-integrated carbon loading and mileage-integrated carbon loading, rather than simply the vehicle driving mileage and driving time, improving the accuracy of vehicle maintenance reminders.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0020] Figure 1 It is a flowchart of a vehicle maintenance method according to the first embodiment of the present invention;

[0021] Figure 2 It is a flowchart of a vehicle maintenance method according to the second embodiment of the present invention;

[0022] Figure 3 It is the flow of a vehicle maintenance method according to the third embodiment of the present invention;

[0023] Figure 4 It is a flowchart of a vehicle maintenance method according to the fourth embodiment of the present invention;

[0024] Figure 5 It is a flowchart of a vehicle maintenance method according to the fifth embodiment of the present invention;

[0025] Figure 6Flowchart of a vehicle maintenance method according to the sixth embodiment of the present invention. Detailed implementation mode

[0026] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0027] It should be noted that the vehicle maintenance method of the embodiments of the present invention is applicable to vehicles including EGR, DOC, DPF, etc. A typical application is a commercial vehicle including a technical route of a diesel high-pressure common rail electronic control system + EGR + DOC + DPF + SCR + ASC and meeting the national VI emission requirements. By performing a series of logical operations according to the actual operating conditions of the vehicle, a maintenance reminder is issued at an appropriate time to remind the user to perform maintenance on the vehicle engine, aftertreatment, etc. in a timely manner according to the instructions, thereby improving the reliability of the vehicle, extending the service life of the vehicle, and creating higher use value and profit.

[0028] Figure 1 Flowchart of a vehicle maintenance method according to an embodiment of the present invention. Refer to Figure 1 As shown, the vehicle maintenance method may include the following steps:

[0029] Step S11, obtain the exhaust gas temperature in front of the diesel particulate filter DPF, engine speed, vehicle speed, ambient temperature, and atmospheric pressure.

[0030] It should be noted that the exhaust gas temperature in front of the DPF refers to the intake temperature of the DPF. The intake temperature of the DPF can be monitored by an exhaust gas temperature sensor set in front of the DPF to obtain the exhaust gas temperature in front of the DPF.

[0031] Step S12, obtain the time-integrated carbon loading according to the exhaust gas temperature in front of the DPF, engine speed, ambient temperature, and atmospheric pressure.

[0032] Specifically, the first carbon accumulation rate can be obtained according to the exhaust gas temperature in front of the DPF, engine speed, ambient temperature, and atmospheric pressure, and the time-integrated carbon loading can be obtained according to the first carbon accumulation rate.

[0033] In some embodiments, the method for obtaining the time-integrated carbon loading according to the exhaust gas temperature in front of the DPF, engine speed, ambient temperature, and atmospheric pressure may include: determining a first MAP reference diagram according to the exhaust gas temperature in front of the DPF and the engine speed; obtaining the first carbon accumulation rate from the first MAP reference diagram according to the ambient temperature and atmospheric pressure; when the vehicle speed is zero and the engine is in operation, integrating the engine running time according to the first carbon accumulation rate to obtain the time-integrated carbon loading.

[0034] Specifically, the vehicle operating conditions can be divided into multiple conditions in advance based on the DPF front row temperature and engine speed. For example, the vehicle operating conditions can be divided into six conditions from 0 to 5. Each of the six conditions corresponds to a calibrated first MAP reference diagram. Among them, each first MAP reference diagram includes different environmental temperature and atmospheric pressure data, as well as the first carbon accumulation rate corresponding to each environmental temperature and atmospheric pressure (the data is sourced from the verification results of the vehicle's actual road tests).

[0035] In practical applications, after obtaining the DPF front row temperature and engine speed of the vehicle, the current vehicle operating condition is determined based on the DPF front row temperature and engine speed. The corresponding first MAP reference diagram is determined according to the current operating condition. Then, the corresponding first carbon accumulation rate is obtained from the first MAP reference diagram based on the acquired environmental temperature and atmospheric pressure. When the vehicle speed is zero and the engine is in the running state, the engine running time is integrated according to the first carbon accumulation rate, and the current time-integrated carbon loading is output in real time.

[0036] Furthermore, a time-integrated carbon loading model can be generated in advance. The input parameters of this model are the DPF front row temperature, engine speed, environmental temperature, and atmospheric pressure, and the output parameter is the time-integrated carbon loading. The condition for real-time operation of this model is that the vehicle speed is zero. In actual use, when the vehicle speed is zero, the time-integrated carbon loading model starts real-time operation, and this model outputs the current time-integrated carbon loading in real time according to the input DPF front row temperature, engine speed, environmental temperature, and atmospheric pressure.

[0037] Step S13, obtain the mileage-integrated carbon loading according to the DPF front row temperature, vehicle speed, environmental temperature, and atmospheric pressure.

[0038] Specifically, the second carbon accumulation rate can be obtained according to the DPF front row temperature, vehicle speed, environmental temperature, and atmospheric pressure, and the mileage-integrated carbon loading can be obtained according to the second carbon accumulation rate.

[0039] In some embodiments, the method for obtaining the mileage-integrated carbon loading according to the DPF front row temperature, vehicle speed, environmental temperature, and atmospheric pressure may include: determining a second MAP reference diagram according to the DPF front row temperature and vehicle speed; obtaining the second carbon accumulation rate from the second MAP reference diagram according to the environmental temperature and atmospheric pressure; when the vehicle speed is greater than zero, integrating the vehicle running mileage according to the second carbon accumulation rate to obtain the mileage-integrated carbon loading.

[0040] Specifically, the vehicle operating conditions can be divided into multiple conditions in advance based on the DPF front row temperature and the vehicle speed. For example, the vehicle operating conditions can be divided into ten conditions from 0 to 9, and each of the ten conditions corresponds to a calibrated second MAP reference diagram. Among them, each second MAP reference diagram includes different environmental temperature and atmospheric pressure data, as well as the second cumulative carbon deposition rate corresponding to each environmental temperature and atmospheric pressure (the data is from the verification results of the actual road test of the vehicle).

[0041] In practical applications, after obtaining the DPF front row temperature and the vehicle speed of the vehicle, the current vehicle operating condition is determined according to the DPF front row temperature and the vehicle speed, the corresponding second MAP reference diagram is determined according to the current operating condition, and then the corresponding second cumulative carbon deposition rate is obtained from the second MAP reference diagram according to the obtained environmental temperature and atmospheric pressure. When the vehicle speed is greater than zero, the vehicle operating mileage is integrated according to the second cumulative carbon deposition rate, and the current mileage integrated carbon loading is output in real time.

[0042] Furthermore, a mileage integrated carbon loading model can be generated in advance. The input parameters of this model are the DPF front row temperature, the vehicle speed, the environmental temperature, and the atmospheric pressure, and the output parameter is the mileage integrated carbon loading. The condition for real-time operation of this model is that the vehicle speed is greater than zero. In actual use, when the vehicle speed is greater than zero, the mileage integrated carbon loading model starts real-time operation, and this model outputs the current mileage integrated carbon loading in real time according to the input DPF front row temperature, vehicle speed, environmental temperature, and atmospheric pressure.

[0043] Step S14, when the sum of the time integrated carbon loading and the mileage integrated carbon loading is greater than the first carbon loading threshold, a parking regeneration reminder is given to the user so that the user can perform parking regeneration according to the parking regeneration reminder.

[0044] Specifically, by summing the obtained time integrated carbon loading and the mileage integrated carbon loading, and comparing and analyzing the sum of the time integrated carbon loading and the mileage integrated carbon loading with the first carbon loading threshold. When the sum of the time integrated carbon loading and the mileage integrated carbon loading is greater than the first carbon loading threshold, a parking regeneration reminder is triggered. For example, the user is reminded through the instrument to select a safe and open area for parking, pull up the handbrake, and press the regeneration switch to perform parking regeneration. The carbon soot accumulated in the DPF is burned off through the high temperature during the DPF regeneration process, thereby achieving the purpose of reducing the exhaust system resistance and reducing power and fuel consumption losses.

[0045] In the above embodiments, based on the actual vehicle operation data such as the temperature in front of the DPF, engine speed, vehicle speed, ambient temperature, and atmospheric pressure, it is possible to automatically determine whether the vehicle needs DPF parking regeneration and remind the user, without manual intervention, improving the intelligence of vehicle maintenance. At the same time, based on the time-integrated carbon loading and mileage-integrated carbon loading to determine whether the vehicle needs DPF parking regeneration, rather than simply relying on the vehicle driving mileage and driving time, improving the accuracy of vehicle maintenance reminders.

[0046] Figure 2 It is a flowchart of a vehicle maintenance method according to another embodiment of the present invention. Refer to Figure 2 As shown, the vehicle maintenance method may include the following steps:

[0047] Step S21, determine the operation time correction coefficient according to the temperature in front of the DPF and the vehicle speed.

[0048] Specifically, the vehicle operation conditions can be divided into multiple conditions based on the temperature in front of the DPF and the vehicle speed in advance. For example, the vehicle operation conditions can be divided into ten conditions from 0 to 9, and each of these ten conditions corresponds to an operation time correction coefficient (the data is from the verification results of actual vehicle road tests).

[0049] In practical applications, after obtaining the temperature in front of the DPF and the vehicle speed of the vehicle, determine the current vehicle operation condition according to the temperature in front of the DPF and the vehicle speed, and determine the corresponding operation time correction coefficient according to the current operation condition.

[0050] Step S22, correct the engine operation time according to the operation time correction coefficient to obtain the operation time correction value.

[0051] Specifically, since different conditions have different impacts on the engine operation. For example, when the vehicle operation condition is stable and good, the maintenance cycle can be appropriately extended, while when the vehicle operation condition is poor, the maintenance cycle needs to be appropriately shortened. Therefore, the corresponding operation time correction coefficient can be determined based on different operation conditions, and the engine operation time is corrected according to the operation time correction coefficient, so that the finally obtained engine operation time not only corresponds to time, but also incorporates the impact of the operation condition on it in the form of a time correction coefficient, making the obtained engine operation time more in line with the actual situation.

[0052] Step S23, when the operation time correction value is greater than the operation time threshold, give the user a parking regeneration reminder so that the user can perform parking regeneration according to the parking regeneration reminder.

[0053] Specifically, when the running time correction value is greater than the set running time threshold, a parking regeneration reminder is triggered. For example, the user is reminded through the instrument to select a safe and open area to park, pull up the handbrake, and press the regeneration switch to perform parking regeneration. The soot accumulated in the DPF is burned off by the high temperature during the DPF regeneration process, so as to reduce the resistance of the exhaust system and reduce power and fuel consumption losses.

[0054] In the above embodiment, by determining the running time correction coefficient according to the exhaust gas temperature in front of the DPF and the vehicle speed of the whole vehicle, and correcting the engine running time according to the running time correction coefficient, the finally obtained engine running time is more in line with the actual situation, effectively improving the accuracy of vehicle maintenance reminders.

[0055] Figure 3 It is a flowchart of a vehicle maintenance method according to another embodiment of the present invention. Refer to Figure 3 As shown, the vehicle maintenance method may include the following steps:

[0056] Step S31, determine the running mileage correction coefficient according to the exhaust gas temperature in front of the DPF and the vehicle speed of the whole vehicle.

[0057] Specifically, the vehicle running conditions can be divided into multiple conditions in advance based on the exhaust gas temperature in front of the DPF and the vehicle speed of the whole vehicle. For example, the vehicle running conditions can be divided into ten conditions from 0 to 9, and each of the ten conditions corresponds to a running mileage correction coefficient (the data is from the verification results of the actual road test of the whole vehicle).

[0058] In practical applications, after obtaining the exhaust gas temperature in front of the DPF and the vehicle speed of the whole vehicle of the vehicle, determine the current running condition of the whole vehicle according to the exhaust gas temperature in front of the DPF and the vehicle speed of the whole vehicle, and determine the corresponding running mileage correction coefficient according to the current running condition.

[0059] Step S32, correct the running mileage of the whole vehicle according to the running mileage correction coefficient to obtain a running mileage correction value.

[0060] Specifically, since the impacts of different conditions on the running of the whole vehicle are different. For example, when the vehicle running condition is stable and good, the maintenance cycle can be appropriately extended, while when the vehicle running condition is poor, the maintenance cycle needs to be appropriately shortened. Therefore, the corresponding running mileage correction coefficient can be determined based on different running conditions, and the running mileage of the whole vehicle is corrected according to the running mileage correction coefficient, so that the finally obtained running mileage of the whole vehicle not only corresponds to the mileage, but also incorporates the impact of the running condition on it in the form of a mileage correction coefficient, making the obtained running mileage of the whole vehicle more in line with the actual situation.

[0061] Step S33, when the running mileage correction value is greater than the running mileage threshold, give a parking regeneration reminder to the user so that the user can perform parking regeneration according to the parking regeneration reminder.

[0062] Specifically, when the running mileage correction value is greater than the set running mileage threshold, a parking regeneration reminder is triggered. For example, the user is reminded through the instrument panel to select a safe and open area to park, pull up the handbrake, and press the regeneration switch to perform parking regeneration. The accumulated soot in the DPF is burned off through the high temperature during the DPF regeneration process, so as to achieve the purpose of reducing the exhaust system resistance and reducing power and fuel consumption losses.

[0063] In the above embodiments, by determining the running mileage correction coefficient according to the exhaust temperature in front of the DPF and the vehicle speed of the whole vehicle, and correcting the running mileage of the whole vehicle according to the running mileage correction coefficient, the finally obtained running mileage of the whole vehicle is more in line with the actual situation, effectively improving the accuracy of vehicle maintenance reminders.

[0064] Figure 4 As a flowchart of a vehicle maintenance method according to another embodiment of the present invention, refer to Figure 4 As shown, the vehicle maintenance method may further include the following steps:

[0065] Step S41, obtain the DPF indicator light status, the exhaust temperature in front of the oxidation catalyst DOC, and the DPF soot load.

[0066] It should be understood that the DPF indicator light status includes the DPF indicator light on state and the DPF indicator light off state. When the DPF indicator light is on, it means that regeneration is in progress. When the DPF indicator light is off, it means that regeneration is over. The exhaust temperature in front of the DOC refers to the intake air temperature upstream of the DOC. The exhaust temperature upstream of the DOC can be monitored by a temperature sensor installed in front of the DOC to obtain the exhaust temperature in front of the DOC.

[0067] Step S42, when the DPF indicator light is on, the exhaust temperature in front of the DOC is greater than the first heating temperature threshold, and the exhaust temperature in front of the DPF is greater than the second heating temperature threshold, record the heating time.

[0068] Specifically, when the DPF indicator light is on, the exhaust temperature in front of the DOC is greater than the first heating temperature threshold, and the exhaust temperature in front of the DPF is greater than the second heating temperature threshold, it is determined that the DPF is in the heating state, and the heating time when the DPF is in the heating state is recorded. Among them, both the first heating temperature threshold and the second heating temperature threshold are temperature set values during the heating process.

[0069] Step S43, when the DPF indicator light is on, the exhaust temperature in front of the DOC is greater than the first regeneration temperature threshold, and the exhaust temperature in front of the DPF is greater than the second regeneration temperature threshold, record the regeneration time.

[0070] Specifically, when the DPF indicator light is on, the DOC front row temperature is greater than the first regeneration temperature threshold, and the DPF front row temperature is greater than the second regeneration temperature threshold, it is determined that the DPF is in the regeneration state, and the regeneration time when the DPF is in the regeneration state is recorded. Among them, both the first regeneration temperature threshold and the second regeneration temperature threshold are temperature setting values for the regeneration process.

[0071] Step S44, when the DPF indicator light is on and the DPF front row temperature is greater than the effective regeneration temperature threshold, record the effective regeneration time.

[0072] Specifically, when the DPF indicator light is on and the DPF front row temperature is greater than the effective regeneration temperature threshold, it can be determined that the DPF is in the effective regeneration state, and the effective regeneration time when the DPF is in the effective regeneration state is recorded. Among them, the effective regeneration temperature threshold is the effective regeneration temperature setting value for the effective regeneration process.

[0073] Step S45, when the DPF indicator light is off and the DPF carbon loading is greater than or equal to the second carbon loading threshold, record the interruption time.

[0074] Specifically, when the DPF indicator light is off and the DPF carbon loading (measured) is greater than the second carbon loading threshold, it is determined that the DPF regeneration enters the interruption state, and the interruption time of the DPF regeneration interruption is recorded.

[0075] Step S46, when the interruption time is greater than the interruption time threshold, if the heating time is greater than the heating time threshold, the regeneration time is greater than the regeneration time threshold, or the effective regeneration time is less than the effective regeneration time threshold, it is determined that the DPF regeneration fails, and the regeneration failure count is recorded.

[0076] Specifically, when the interruption time is greater than the set interruption time threshold, if the heating time is greater than the set heating time threshold, the regeneration time is greater than the set regeneration time threshold, or the effective regeneration time is less than the set effective regeneration time threshold, it is determined that the DPF regeneration fails, the regeneration failure count is incremented by one, and the cumulative processed regeneration failure count is recorded.

[0077] Step S47, when the regeneration failure count is greater than the failure count threshold, give a parking regeneration reminder to the user so that the user can perform parking regeneration according to the parking regeneration reminder.

[0078] Specifically, when the regeneration failure count exceeds the set failure count threshold, trigger a parking regeneration reminder, prompt the user to select a safe and open area for parking, pull up the handbrake, press the regeneration switch to perform parking regeneration, perform a complete DPF regeneration, and burn off the accumulated soot in the DPF through the high temperature during the DPF regeneration process, thereby achieving the purpose of reducing the exhaust system resistance and reducing power and fuel consumption losses.

[0079] Further, continue to refer toFigure 5 As shown, the vehicle maintenance method may further include the following steps:

[0080] Step S48: When the DPF indicator light is off, the DPF carbon loading is less than the second carbon loading threshold, and the effective regeneration time is greater than the effective regeneration time threshold, it is determined that the DPF regeneration is successful, and the number of successful regenerations is recorded.

[0081] Specifically, when the DPF indicator light is off, the DPF carbon loading is less than the set second carbon loading threshold, and the effective regeneration time is higher than the set effective regeneration time threshold, it can be determined that the DPF regeneration is successful, increment the number of successful regenerations by one, and record the cumulative processed number of successful regenerations.

[0082] In the above embodiments, based on the status of the DPF indicator light, combined with the DOC front row temperature, the DPF front row temperature, and the DPF carbon loading, the autonomous judgment of the DPF regeneration process can be realized, and the judgment process covers a variety of regeneration working conditions, and the information related to the DPF regeneration is truly recorded.

[0083] Further, referring to Figure 6 As shown, the vehicle maintenance method may further include the following steps:

[0084] Step S51: Obtain the number of regeneration failures, the number of successful regenerations, the total regeneration duration, the engine running time, the vehicle running mileage, the running time correction value, and the running mileage correction value within the maintenance cycle.

[0085] Specifically, the number of regeneration failures, the number of successful regenerations, the running time correction value, and the running mileage correction value within the maintenance cycle can be obtained according to the foregoing method, and at the same time, the sum of the regeneration times within the maintenance cycle is obtained to get the total regeneration duration within the maintenance cycle.

[0086] Step S52: When any one of the sum of the number of regeneration failures and the number of successful regenerations within the maintenance cycle, the total regeneration duration within the maintenance cycle, the engine running time within the maintenance cycle, and the vehicle running mileage within the maintenance cycle meets a preset condition, a reminder for engine oil maintenance is given to the user.

[0087] It should be understood that during the DPF regeneration process, part of the diesel will flow into the oil pan along the cylinder wall and dilute the diesel. As the number of regenerations increases, the situation of oil dilution will become serious, which will cause the lubrication effect of the engine oil to deteriorate, and may cause the wear of engine-related parts and make them unusable. Therefore, it is necessary to replace the engine oil in time. Specifically, when any one of the sum of the number of regeneration failures and the number of successful regenerations within the maintenance cycle, the total regeneration duration within the maintenance cycle, the engine running time within the maintenance cycle, and the vehicle running mileage within the maintenance cycle reaches the corresponding set value, an engine oil maintenance reminder is triggered, such as reminding the user through the instrument to arrive at the station in time for the vehicle engine oil maintenance, such as changing the engine oil.

[0088] Step S53: When the running time correction value within the maintenance period or the running mileage correction value within the maintenance period meets the preset conditions, remind the user of the exhaust gas recirculation (EGR) maintenance and the diesel particulate filter (DPF) maintenance.

[0089] Specifically, when the running time correction value within the maintenance period or the running mileage correction value within the maintenance period reaches the corresponding set value, trigger the EGR and DPF maintenance reminders, such as reminding the user through the instrument to arrive at the station in time for the whole vehicle EGR and DPF ash cleaning maintenance.

[0090] Further, after the maintenance is completed, the maintenance reminder can be cleared through the instrument prompt, the maintenance times are incremented by one, the information within the current maintenance period is cleared, and the information calculation and storage for the next maintenance period are restarted.

[0091] In the above embodiments, by performing the maintenance reminders for the engine oil, EGR, and DPF based on the number of regeneration failures, the number of regeneration successes, the total regeneration duration, the engine running time, the whole vehicle running mileage, the running time correction value, and the running mileage correction value within the maintenance period, the maintenance items of the whole vehicle are enriched, so that the EGR and DPF are also maintained in a timely manner, solving the problem of the lack of maintenance for the EGR and DPF at present, and the maintenance reminder has a high accuracy, improving the service life of the whole vehicle.

[0092] Further, referring to Figure 6 As shown, after the parking regeneration reminder, the EGR maintenance reminder, or the DPF maintenance reminder is given to the user, the method may further include the following steps:

[0093] Step S61: Obtain the whole vehicle running time and the whole vehicle running mileage.

[0094] Specifically, after the parking regeneration reminder or the maintenance reminder is issued, synchronously record the whole vehicle running time and the whole vehicle running mileage after the reminder. At this time, the user needs to perform parking regeneration according to the parking regeneration reminder or go to the service station in time for the corresponding maintenance according to the maintenance reminder.

[0095] Step S62: When the user does not perform parking regeneration or does not perform maintenance, if the whole vehicle running time and the whole vehicle running mileage meet the first protection condition, impose a primary limit on the engine speed and the engine torque.

[0096] Specifically, if the user ignores the parking regeneration reminder or the maintenance reminder and continues to operate the vehicle, when the total vehicle operation time and the total vehicle operation mileage of the vehicle exceed the operation time and operation mileage set by the primary protection, a first-level limit is triggered, that is, the maximum engine speed is limited to V1 (for example, V1 is 75% of the engine rated speed) and the maximum engine torque is limited to T1 (for example, T1 is 75% of the engine rated torque), and it is sent to the engine ECU (Electronic Control Unit) for engine speed limitation and engine torque limitation, and the user is informed through the instrument that the vehicle has been subject to the first-level limit, urging the user to go to the relevant service station for vehicle maintenance as soon as possible.

[0097] Step S63, if the total vehicle operation time and the total vehicle operation mileage meet the second protection condition, a second-level limit is imposed on the engine speed and the engine torque. The maximum engine speed during the second-level limit is less than the maximum engine speed during the first-level limit, and the maximum engine torque during the second-level limit is less than the maximum engine torque during the first-level limit.

[0098] Specifically, if the user continues to ignore the parking regeneration reminder or the maintenance reminder and continues to operate the vehicle, when the total vehicle operation time and the total vehicle operation mileage of the vehicle exceed the operation time and operation mileage set by the second-level protection, a second-level limit is triggered, that is, the maximum engine speed is limited to V2 (for example, V2 is 50% of the engine rated speed) and the maximum engine torque is limited to T2 (for example, T2 is 50% of the engine rated torque), and it is sent to the engine ECU for engine speed limitation and engine torque limitation, and the user is informed through the instrument that the vehicle has been subject to the second-level limit, further urging the user to go to the relevant service station for vehicle maintenance as soon as possible.

[0099] In the above embodiments, when the user fails to perform the corresponding maintenance, by limiting the speed and torque of the vehicle to urge the user to perform the corresponding maintenance, it can correct the bad operation habits such as the user's untimely maintenance, avoid problems such as the damage of the whole vehicle caused by untimely maintenance, protect the whole vehicle from damage to the greatest extent, improve the safety and reliability of the whole vehicle, and at the same time extend the service life of the vehicle.

[0100] It should be noted that in practical applications, an intelligent maintenance reminder controller RCU can be added to the vehicle. The RCU is connected to the vehicle's CAN (Controller Area Network), and can obtain in real time information such as engine speed, vehicle speed, DOC front temperature, DPF front temperature, atmospheric pressure, ambient temperature, engine torque percentage, vehicle operating mileage, DPF carbon loading, DPF indicator status, etc. recorded by the vehicle ECU, and perform maintenance reminders according to the aforementioned vehicle maintenance method. Among them, due to data transmission through the CAN bus data stream, the RCU can be widely applied to various diesel-powered vehicle models, has strong adaptability, and does not require additional components, and will not affect other components of the vehicle.

[0101] In summary, according to the vehicle maintenance method of the embodiments of the present invention, through a series of intelligent calculations on the vehicle operating conditions, relevant reminders can be issued at an appropriate time to guide users to perform vehicle maintenance or cleaning in a timely manner, such as DPF parking regeneration, oil maintenance, EGR cleaning, and DPF post-treatment ash cleaning, etc. When the user fails to perform maintenance in a timely manner as required, when driving a certain distance, the vehicle driving is restricted by speed limit or torque limit to urge the user to perform maintenance, so as to realize intelligent reminder of vehicle maintenance and supervision of maintenance behavior, protect the vehicle from damage to the greatest extent, and effectively solve the problems in the related technology that the maintenance reminder method is too mechanical and the intelligence is too low, and the maintenance items mainly rely on the suggestions of service stations and customer requirements. Since different service stations and user requirements are different, there are large differences in maintenance items, which may cause over-maintenance or improper maintenance, etc. Moreover, the maintenance includes the maintenance of DPF and EGR, effectively solving the problem of the lack of maintenance and standardized maintenance of DPF and EGR at present.

[0102] Furthermore, an embodiment of the present invention also provides a vehicle, including a memory, a processor, and a vehicle maintenance program stored on the memory and executable on the processor. When the processor executes the vehicle maintenance program, the above-mentioned vehicle maintenance method is realized.

[0103] For a vehicle according to an embodiment of the present invention, when the vehicle maintenance program stored thereon is executed by a processor, by implementing the foregoing vehicle maintenance method, relevant reminders can be sent at appropriate times to guide the user to perform vehicle maintenance or cleaning in a timely manner, such as DPF parked regeneration, engine oil maintenance, EGR cleaning, and DPF post-treatment ash cleaning, etc. When the user fails to perform maintenance in a timely manner as required, when a certain distance is traveled, the vehicle driving is restricted by speed limit or torque limit to urge the user to perform maintenance, so as to realize intelligent reminder of vehicle maintenance and supervision of maintenance behavior, protect the whole vehicle from damage to the greatest extent, and effectively solve the problems in the related art that the maintenance reminder method is too mechanical and the intelligence is too low, as well as the maintenance items mainly rely on the suggestions of service stations and customer requirements. Since different service stations and users have different requirements, there are significant differences in maintenance items, which may cause over-maintenance or improper maintenance, etc. Moreover, the maintenance includes the maintenance of DPF and EGR, effectively solving the problem of the lack of maintenance and standardized maintenance of DPF and EGR at present.

[0104] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or used in combination with these instruction execution systems, apparatus, or devices.

[0105] In the description of this specification, the description with reference to terms such as "an embodiment" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0106] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features.

[0107] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A vehicle maintenance method, characterized in that, the method includes: obtaining the exhaust gas temperature in front of the diesel particulate filter (DPF), the engine speed, the vehicle speed, the ambient temperature, and the atmospheric pressure; obtaining the time-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the engine speed, the ambient temperature, and the atmospheric pressure; obtaining the mileage-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the vehicle speed, the ambient temperature, and the atmospheric pressure; the obtaining the time-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the engine speed, the ambient temperature, and the atmospheric pressure includes: determining a first MAP reference graph according to the exhaust gas temperature in front of the DPF and the engine speed; obtaining a first carbon accumulation rate from the first MAP reference graph according to the ambient temperature and the atmospheric pressure; when the vehicle speed is zero and the engine is in operation, integrating the engine running time according to the first carbon accumulation rate to obtain the time-integrated carbon loading; the obtaining the mileage-integrated carbon loading according to the exhaust gas temperature in front of the DPF, the vehicle speed, the ambient temperature, and the atmospheric pressure includes: determining a second MAP reference graph according to the exhaust gas temperature in front of the DPF and the vehicle speed; obtaining a second carbon accumulation rate from the second MAP reference graph according to the ambient temperature and the atmospheric pressure; when the vehicle speed is greater than zero, integrating the vehicle running mileage according to the second carbon accumulation rate to obtain the mileage-integrated carbon loading, and when the sum of the time-integrated carbon loading and the mileage-integrated carbon loading is greater than a first carbon loading threshold, giving a parking regeneration reminder to the user so that the user can perform parking regeneration according to the parking regeneration reminder; obtaining the status of the DPF indicator light, the exhaust gas temperature in front of the diesel oxidation catalyst (DOC), and the DPF carbon loading; when the DPF indicator light is on, the exhaust gas temperature in front of the DOC is greater than a first heating temperature threshold, and the exhaust gas temperature in front of the DPF is greater than a second heating temperature threshold, recording the heating time; when the DPF indicator light is on, the exhaust gas temperature in front of the DOC is greater than a first regeneration temperature threshold, and the exhaust gas temperature in front of the DPF is greater than a second regeneration temperature threshold, recording the regeneration time; when the DPF indicator light is on and the exhaust gas temperature in front of the DPF is greater than an effective regeneration temperature threshold, recording the effective regeneration time; when the DPF indicator light is off and the DPF carbon loading is greater than or equal to a second carbon loading threshold, recording the interruption time; when the interruption time is greater than an interruption time threshold, if the heating time is greater than a heating time threshold, the regeneration time is greater than a regeneration time threshold, or the effective regeneration time is less than an effective regeneration time threshold, determining that the DPF regeneration fails and recording the number of regeneration failures; when the number of regeneration failures is greater than a failure number threshold, giving a parking regeneration reminder to the user so that the user can perform parking regeneration according to the parking regeneration reminder.

2. The vehicle maintenance method according to claim 1, characterized in that, the method further includes: determining an operation time correction coefficient according to the exhaust gas temperature in front of the DPF and the vehicle speed. The engine running time is corrected according to the running time correction coefficient to obtain a running time correction value; When the running time correction value is greater than the running time threshold, a parking regeneration reminder is given to the user so that the user can perform parking regeneration according to the parking regeneration reminder.

3. The vehicle maintenance method according to claim 1, characterized in that, the method further includes: Determine a running mileage correction coefficient according to the temperature in front of the DPF and the vehicle speed of the whole vehicle; The whole vehicle running mileage is corrected according to the running mileage correction coefficient to obtain a running mileage correction value; When the running mileage correction value is greater than the running mileage threshold, a parking regeneration reminder is given to the user so that the user can perform parking regeneration according to the parking regeneration reminder.

4. The vehicle maintenance method according to claim 1, characterized in that, the method further includes: When the DPF indicator light is off, the DPF carbon loading is less than the second carbon loading threshold, and the effective regeneration time is greater than the effective regeneration time threshold, it is determined that the DPF regeneration is successful, and the number of successful regenerations is recorded.

5. The vehicle maintenance method according to claim 4, characterized in that, the method further includes: Obtain the number of regeneration failures, the number of successful regenerations, the total regeneration duration, the engine running time, the whole vehicle running mileage, the running time correction value, and the running mileage correction value during the maintenance period; When any one of the sum of the number of regeneration failures and the number of successful regenerations during the maintenance period, the total regeneration duration during the maintenance period, the engine running time during the maintenance period, and the whole vehicle running mileage during the maintenance period meets a preset condition, an oil maintenance reminder is given to the user; When the running time correction value during the maintenance period or the running mileage correction value during the maintenance period meets a preset condition, an exhaust gas recirculation (EGR) maintenance reminder and a DPF maintenance reminder are given to the user.

6. The vehicle maintenance method according to claim 5, characterized in that, After the parking regeneration reminder, the EGR maintenance reminder, or the DPF maintenance reminder is given to the user, the method further includes: Obtain the whole vehicle running time and the whole vehicle running mileage; When the user does not perform parking regeneration or maintenance, if the whole vehicle running time and the whole vehicle running mileage meet the first protection condition, the engine speed and engine torque are restricted at the first level; If the whole vehicle running time and the whole vehicle running mileage meet the second protection condition, the engine speed and engine torque are restricted at the second level, and the maximum engine speed during the second level restriction is less than the maximum engine speed during the first level restriction, and the maximum engine torque during the second level restriction is less than the maximum engine torque during the first level restriction.

7. A vehicle, characterized in that, includes: A memory, a processor, and a vehicle maintenance program stored on the memory and executable on the processor. When the processor executes the program, the vehicle maintenance method according to any one of claims 1-6 is implemented.

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