CN113985177A - Method and device for quickly diagnosing 48V system fault of hybrid electric vehicle - Google Patents
Method and device for quickly diagnosing 48V system fault of hybrid electric vehicle Download PDFInfo
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- CN113985177A CN113985177A CN202111270648.7A CN202111270648A CN113985177A CN 113985177 A CN113985177 A CN 113985177A CN 202111270648 A CN202111270648 A CN 202111270648A CN 113985177 A CN113985177 A CN 113985177A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
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Abstract
The invention discloses a method and a device for quickly diagnosing 48V system faults of a hybrid vehicle, wherein the diagnosis method comprises the following steps: collecting the voltage value of a 12V power supply circuit of a 48V system, judging whether the 12V power supply circuit has a fault or not, if the 12V power supply circuit has the fault, outputting a 12V power supply fault signal, otherwise, further collecting the voltage value of a grounding circuit, judging whether the system grounding circuit has the fault or not, if the system grounding circuit has the fault, outputting a grounding fault signal, otherwise, further collecting the voltage value of a CAN network circuit, judging whether a CAN network has the fault or not, if the CAN network has the fault, outputting a CAN communication network fault signal, and otherwise, outputting a system normal signal. The invention can judge whether each circuit in the system has a fault or not by sampling the voltage value of each circuit in the 48V system, thereby improving the diagnosis accuracy and the diagnosis efficiency.
Description
Technical Field
The invention relates to the technical field of light hybrid vehicle 48V system fault detection, in particular to a method and a device for quickly diagnosing a 48V system fault of a hybrid vehicle.
Background
The 48V system, the 48V battery and the DCDC direct current conversion module are added on the basis of a traditional fuel vehicle, the 48V system formed by the 48V motor, the 48V battery and the DCDC direct current conversion module is in charge of storing energy for the 48V battery in the braking process and converting the electric energy of the 48V battery into the electric energy of the 12V battery on one hand, and in charge of providing certain power support for the vehicle in idling on the other hand, so that the effect of reducing fuel consumption is achieved. However, the 48V system, once failed, would cause the operation of the whole 48V system to be abnormal, thereby causing the risk of the vehicle generating power feeding and even flameout. Therefore, a method and a device for quickly diagnosing the 48V system are developed, which can judge the fault source at the first time and help vehicle maintenance personnel to quickly solve the problems of customers.
The existing diagnosis technology generally adopts methods such as collecting fault codes and measuring related fault lines through universal diagnosis equipment to diagnose faults, but the methods generate a lot of secondary codes and historical unremoved codes during diagnosis, thereby confusing the judgment of maintenance personnel, increasing the workload of measuring the related lines after diagnosis, increasing the maintenance waiting time of customers, being incapable of quickly diagnosing whether a 48V system has faults or not, being incapable of solving the problems of the customers in time and increasing the waiting time of the customers.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
The first purpose of the invention is to provide a method for quickly diagnosing 48V system faults of a hybrid vehicle.
A second object of the present invention is to provide a rapid diagnosis apparatus for a 48V system failure of a hybrid vehicle.
In order to achieve the first object of the present invention, the present invention provides a method for rapidly diagnosing a fault of a 48V system of a hybrid vehicle, wherein the 48V system of the hybrid vehicle comprises a 48V motor, a 48V battery, a DCDC direct current conversion module, a power supply circuit and a CAN communication network, and the method for rapidly diagnosing the fault comprises the following steps:
step 1, collecting a voltage value of a 12V power supply circuit of a 48V system, judging whether the 12V power supply circuit has a fault, if so, outputting a 12V power supply fault signal, otherwise, executing step 2;
step 2, collecting a voltage value of a 48V system grounding circuit, judging whether the system grounding circuit has a fault or not, outputting a grounding fault signal if the system grounding circuit has the fault, and otherwise, executing the step 3;
step 3, collecting a voltage value of a CAN network circuit of the 48V system, judging whether the CAN network has a fault, if the CAN network has the fault, outputting a CAN communication network fault signal, and if not, executing the step 4;
and 4, outputting a system normal signal.
In the technical scheme, the voltage values of the 12V power supply circuit, the grounding circuit, the CAN network circuit and the 48V power supply circuit in the 48V system are sequentially sampled to judge whether each circuit in the system has a fault or not, and then corresponding fault signals are output, so that the problem that maintenance personnel misjudge due to the fact that codes are not cleared by secondary codes and historical codes in the diagnosis process of the traditional 48V system is effectively solved, meanwhile, the diagnosis time of the fault CAN be greatly shortened by the method for diagnosing the fault by collecting the voltage signals of the circuit, and the diagnosis efficiency is improved.
In the above technical solution, the step 1 of collecting the voltage value of the 12V power supply circuit of the 48V system and determining whether the 12V power supply circuit has a fault includes:
and judging whether the voltage value of the 12V power supply circuit is in a preset area range of the system or not according to the acquired voltage value of the 12V power supply circuit of the 48V system, and outputting a 12V power supply fault signal if the voltage value of the 12V power supply circuit is greater than a preset upper limit value of the system or less than a preset lower limit value of the system.
In the above technical solution, the process of collecting the voltage value of the 48V system ground circuit and determining whether the system ground circuit is faulty in step 2 is as follows:
and judging whether the voltage value of the system grounding circuit is in a region range preset by the system or not according to the acquired voltage value of the 48V system grounding circuit, and outputting a grounding fault signal if the voltage value of the system grounding circuit is greater than an upper limit value preset by the system.
In the above technical solution, the step 3 of collecting the voltage value of the CAN network circuit of the 48V system and determining whether the CAN network has a fault includes:
and judging whether the voltage value of the CAN network circuit is in a preset area range of the system or not according to the acquired voltage value of the 48V system CAN network circuit, and outputting a CAN communication network fault signal if the voltage value of the CAN network circuit is greater than a preset upper limit value of the system or less than a preset lower limit value of the system.
In the technical scheme of any one of the steps, the method for acquiring the voltage value of each circuit comprises the following steps: continuously collecting voltage values of n target circuits, removing a maximum value and a minimum value, and then calculating the arithmetic mean of the remaining n-2 data, namely the voltage value collected by the target circuit, wherein the value range of n is more than or equal to 5 and less than or equal to 15.
In order to achieve the second object of the present invention, an embodiment of the present invention provides a device for quickly diagnosing a 48V system fault of a hybrid vehicle, including a switching interface, a signal sampling module, a signal processing module and a signal display module;
the adapter is used for being in butt joint with a signal output interface of the 48V system and a wiring harness of the vehicle so as to obtain related signals and voltage values of the 48V system and the vehicle communication;
the signal sampling module is used for receiving 12V power supply circuit voltage, grounding circuit voltage, CAN network circuit voltage and 48V power supply circuit voltage signals of a 48V system, filtering and AD converting the received signals, converting analog signals into digital signals and outputting the digital signals to the signal processing module;
the signal processing module is used for receiving the signals transmitted by the signal acquisition module, confirming whether the voltage value of each circuit falls within a preset range of the system or not and outputting a confirmation result to the signal display module;
the signal display module is used for receiving the signal transmitted by the signal processing module so as to display a corresponding fault signal or a system normal signal, and the type of the fault signal comprises: a 12V power supply abnormal fault, a ground fault and a CAN communication network fault.
In the technical scheme, related signals and voltage values of the 48V system and the vehicle communication are obtained through the adapter, signals of each voltage circuit in the system are processed and diagnosed through the signal sampling and processing module, and the diagnosis result is displayed to maintenance personnel through the signal display module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for rapidly diagnosing a 48V system fault of a hybrid vehicle according to the present invention;
fig. 2 is a schematic composition diagram of a 48V system fault rapid diagnosis device of a hybrid vehicle according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
The technical solutions of some embodiments of the present invention are described below with reference to fig. 1 and 2.
Example 1
As shown in fig. 1, the present embodiment provides a method for quickly diagnosing a fault of a 48V system of a hybrid vehicle, where the 48V system of the hybrid vehicle includes a 48V motor, a 48V battery, a DCDC dc conversion module, a power supply circuit, and a CAN communication network, and the method for quickly diagnosing a fault includes the following steps:
step 1, collecting a voltage value of a 12V power supply circuit of a 48V system, judging whether the 12V power supply circuit has a fault, if so, outputting a 12V power supply fault signal, otherwise, executing step 2;
step 2, collecting a voltage value of a 48V system grounding circuit, judging whether the system grounding circuit has a fault or not, outputting a grounding fault signal if the system grounding circuit has the fault, and otherwise, executing the step 3;
step 3, collecting a voltage value of a CAN network circuit of the 48V system, judging whether the CAN network has a fault, if the CAN network has the fault, outputting a CAN communication network fault signal, and if not, executing the step 4;
and 4, outputting a system normal signal.
In the embodiment, the voltage values of the 12V power supply circuit, the grounding circuit and the CAN network circuit in the 48V system are sequentially sampled to judge whether each circuit in the system has a fault or not, and then corresponding fault signals are output, so that the problem that maintenance personnel misjudge due to the fact that codes are not cleared due to secondary codes and historical codes in the diagnosis process of the traditional 48V system is effectively solved, meanwhile, the fault diagnosis time CAN be greatly shortened and the diagnosis efficiency is improved by the method for collecting the circuit voltage signals to perform fault diagnosis.
Specifically, in step 1, the process of collecting the voltage value of the 12V power supply circuit of the 48V system and judging whether the 12V power supply circuit has a fault is as follows:
and judging whether the voltage value of the 12V power supply circuit is in a preset area range of the system or not according to the acquired voltage value of the 12V power supply circuit of the 48V system, and outputting a 12V power supply fault signal if the voltage value of the 12V power supply circuit is greater than a preset upper limit value of the system or less than a preset lower limit value of the system.
Specifically, the step 2 of collecting the voltage value of the 48V system ground circuit and determining whether the system ground circuit has a fault includes:
and judging whether the voltage value of the system grounding circuit is in a region range preset by the system or not according to the acquired voltage value of the 48V system grounding circuit, and outputting a grounding fault signal if the voltage value of the system grounding circuit is greater than an upper limit value preset by the system.
Specifically, the step 3 of collecting the voltage value of the CAN network circuit of the 48V system and determining whether the CAN network has a fault includes:
and judging whether the voltage value of the CAN network circuit is in a preset area range of the system or not according to the acquired voltage value of the 48V system CAN network circuit, and outputting a CAN communication network fault signal if the voltage value of the CAN network circuit is greater than a preset upper limit value of the system or less than a preset lower limit value of the system.
In this embodiment, the method for acquiring the voltage value of each circuit in each step includes: continuously collecting voltage values of n target circuits, removing a maximum value and a minimum value, and then calculating an arithmetic mean of the remaining n-2 data, namely the voltage value collected by the target circuit, wherein the value range of n can be between 5 and 15 or larger, but the larger the value of n is, the higher the requirement on ram of a hardware system of the diagnostic device is, the longer the corresponding diagnostic time is.
Example 2
As shown in fig. 2, the embodiment provides a device for quickly diagnosing a 48V system fault of a hybrid vehicle, which includes a switching interface, a signal sampling module, a signal processing module and a signal display module;
the adapter is used for being in butt joint with a signal output interface of the 48V system and a wiring harness of the vehicle so as to obtain related signals and voltage values of the 48V system and the vehicle communication;
the signal sampling module is used for receiving 12V power supply circuit voltage, grounding circuit voltage, CAN network circuit voltage and 48V power supply circuit voltage signals of a 48V system, filtering and AD converting the received signals, converting analog signals into digital signals and outputting the digital signals to the signal processing module;
the signal processing module is used for receiving the signals transmitted by the signal acquisition module, confirming whether the voltage value of each circuit falls within a preset range of the system or not and outputting a confirmation result to the signal display module;
the signal display module is used for receiving the signal transmitted by the signal processing module so as to display a corresponding fault signal or a system normal signal, and the type of the fault signal comprises: a 12V power supply abnormal fault, a ground fault and a CAN communication network fault.
In the embodiment, the related signals and voltage values of the communication between the 48V system and the vehicle are obtained through the adapter, the signals of each voltage circuit in the system are processed and diagnosed by the signal sampling and processing module, and the diagnosis result is displayed to maintenance personnel through the signal display module.
Specifically, the working principle of the 48V system fault rapid diagnosis device is as follows: setting the sampling voltage of the target circuit to VnWherein n is more than or equal to 5 and less than or equal to 15, continuously collecting voltage values of n target circuits through the adapter and the signal sampling module, inputting the voltage values into the signal processing module, removing the maximum value and the minimum value from the voltage values, then calculating the arithmetic mean of the remaining n-2 data, and recording the calculation result as ViAnd will ViComparing with standard voltage V set by target circuit in system, calculating their difference value, i.e. delta V = V-ViAnd diagnosing whether the target circuit has a fault or not by comparing the absolute value of the delta V with a preset threshold i (the value range of the preset threshold is 2-3V), and outputting a diagnosis result to a signal display module for displaying.
In summary, the embodiment of the invention has the following beneficial effects:
compared with the prior art that the diagnosis method for measuring the related fault circuit by acquiring the system fault code has no interference of secondary codes and historical unremoved codes, the obtained diagnosis result is more accurate, the diagnosis time is shortened, and the fault diagnosis efficiency is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for quickly diagnosing faults of a 48V system of a hybrid vehicle is characterized in that the 48V system of the hybrid vehicle comprises a 48V motor, a 48V battery, a DCDC direct current conversion module, a power supply circuit and a CAN communication network, and the method for quickly diagnosing the faults comprises the following steps:
step 1, collecting a voltage value of a 12V power supply circuit of a 48V system, judging whether the 12V power supply circuit has a fault, if so, outputting a 12V power supply fault signal, otherwise, executing step 2;
step 2, collecting a voltage value of a 48V system grounding circuit, judging whether the system grounding circuit has a fault or not, outputting a grounding fault signal if the system grounding circuit has the fault, and otherwise, executing the step 3;
step 3, collecting a voltage value of a CAN network circuit of the 48V system, judging whether the CAN network has a fault, if the CAN network has the fault, outputting a CAN communication network fault signal, and if not, executing the step 4;
and 4, outputting a system normal signal.
2. The method for rapidly diagnosing the 48V system fault of the hybrid vehicle according to claim 1, wherein the step 1 of acquiring the voltage value of the 12V power supply circuit of the 48V system and judging whether the 12V power supply circuit has the fault comprises the following steps:
and judging whether the voltage value of the 12V power supply circuit is in a preset area range of the system or not according to the acquired voltage value of the 12V power supply circuit of the 48V system, and outputting a 12V power supply fault signal if the voltage value of the 12V power supply circuit is greater than a preset upper limit value of the system or less than a preset lower limit value of the system.
3. The method for rapidly diagnosing the fault of the 48V system of the hybrid vehicle according to claim 1, wherein the step 2 of collecting the voltage value of the 48V system grounding circuit and judging whether the system grounding circuit is in fault comprises the following steps:
and judging whether the voltage value of the system grounding circuit is in a region range preset by the system or not according to the acquired voltage value of the 48V system grounding circuit, and outputting a grounding fault signal if the voltage value of the system grounding circuit is greater than an upper limit value preset by the system.
4. The method for rapidly diagnosing the fault of the 48V system of the hybrid vehicle according to claim 1, wherein the step 3 of collecting the voltage value of the CAN network circuit of the 48V system and judging whether the CAN network has the fault comprises the following steps:
and judging whether the voltage value of the CAN network circuit is in a preset area range of the system or not according to the acquired voltage value of the 48V system CAN network circuit, and outputting a CAN communication network fault signal if the voltage value of the CAN network circuit is greater than a preset upper limit value of the system or less than a preset lower limit value of the system.
5. The method for rapidly diagnosing the 48V system fault of the hybrid vehicle according to claim 1, wherein the method for acquiring the voltage value of each circuit in the steps 1-3 comprises the following steps: continuously collecting voltage values of n target circuits, removing a maximum value and a minimum value, and then calculating the arithmetic mean of the remaining n-2 data, namely the voltage value collected by the target circuit, wherein the value range of n is more than or equal to 5 and less than or equal to 15.
6. A48V system fault rapid diagnosis device of a hybrid vehicle is characterized by comprising three modules, namely a switching interface, a signal sampling module, a signal processing module and a signal display module;
the adapter is used for being in butt joint with a signal output interface of the 48V system and a wiring harness of the vehicle so as to obtain related signals and voltage values of the 48V system and the vehicle communication;
the signal sampling module is used for receiving the voltage of a 12V power supply circuit, the voltage of a grounding circuit and the voltage of a CAN network circuit of a 48V system, filtering and AD converting the received signals, converting analog signals into digital signals and outputting the digital signals to the signal processing module;
the signal processing module is used for receiving the signals transmitted by the signal acquisition module, confirming whether the voltage value of each circuit falls within a preset range of the system or not and outputting a confirmation result to the signal display module;
the signal display module is used for receiving the signal transmitted by the signal processing module so as to display a corresponding fault signal or a system normal signal, and the type of the fault signal comprises: a 12V power supply abnormal fault, a ground fault and a CAN communication network fault.
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