CN110187182B - Monitoring method and device - Google Patents
Monitoring method and device Download PDFInfo
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- CN110187182B CN110187182B CN201910582427.XA CN201910582427A CN110187182B CN 110187182 B CN110187182 B CN 110187182B CN 201910582427 A CN201910582427 A CN 201910582427A CN 110187182 B CN110187182 B CN 110187182B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The application provides a monitoring method and a device, wherein the monitoring method comprises the following steps: collecting a plurality of voltage values of a power supply in any oil injection duration period, obtaining the difference value between the maximum value and the minimum value in the voltage values of the power supply, and recording the difference value as voltage drop, wherein the difference between the maximum value in the collected power supply voltage values and the actual power supply voltage maximum value in the oil injection duration period is in an allowable range, and the difference between the minimum value in the collected power supply voltage values and the actual power supply voltage minimum value in the oil injection duration period is in the allowable range; and when the voltage drop is judged to be not less than the preset value, determining that the resistance of the power supply line of the ECU is too large. According to the technical scheme, when the voltage drop is judged to be not less than the preset value, the fact that the power supply line of the ECU is excessively blocked is determined, so that fault can be timely reported according to a judgment result, a user is reminded to check, and the ECU is prevented from generating abnormity during operation.
Description
Technical Field
The invention relates to the field of power supply line resistance monitoring of an ECU (electronic control Unit) in an engine, in particular to a monitoring method and a monitoring device.
Background
An Electronic Control Unit (ECU) of an engine is one of core elements of modern automobile electronics, and the ECU is used for monitoring various input data (such as braking, gear shifting and the like) and various running states (acceleration, slipping, oil consumption and the like) of an automobile, calculating information sent by various sensors according to a pre-designed program, processing the information, sending various parameters to relevant execution mechanisms, and executing various preset Control functions.
In the prior art, the ECU cannot automatically monitor the line resistance state of a power supply line in real time, and the ECU often causes overlarge resistance of the power supply line due to the complex power supply line, so that the ECU works abnormally.
Disclosure of Invention
In view of this, the present invention provides a monitoring method and apparatus, which can effectively solve the problems existing in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a monitoring method for use in electrical supply line resistance monitoring of an ECU in an engine having a predetermined block with at least one fuel injection on-duration period, the method comprising:
collecting a plurality of voltage values of a power supply in any one oil injection duration period, obtaining the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply, and recording the difference value as voltage drop, wherein the difference between the maximum value in the collected power supply voltage values and the maximum value of the actual power supply voltage in the oil injection duration period is within an allowable range, and the difference between the minimum value in the collected power supply voltage values and the minimum value of the actual power supply voltage in the oil injection duration period is within the allowable range;
and when the voltage drop is judged to be not less than the preset value, determining that the resistance of the power supply line of the ECU is too large.
Optionally, the preset cylinder of the engine has a plurality of oil injection duration periods, where before determining that the voltage drop is not less than the preset value, the method further includes:
collecting a plurality of voltage values of a power supply in a preset number of oil injection duration periods, obtaining the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply corresponding to each oil injection duration period, and recording the difference value as voltage drop;
and calculating the average value of all voltage drops, and recording the average value as the average voltage drop, wherein when the average voltage drop is judged not to be less than the preset value, the over-resistance of the power supply line of the ECU is determined.
Optionally, obtaining a difference between a maximum value and a minimum value of the plurality of voltage values of the power supply corresponding to any one of the oil injection duration periods, and recording the difference as a voltage drop, includes:
storing a plurality of voltage values of the power supply corresponding to any one oil injection duration period into a first array;
searching the maximum value and the minimum value of a plurality of voltage values of the power supply in the first array;
and calculating the difference value between the maximum value and the minimum value of the plurality of voltage values of the power supply, and recording the difference value as voltage drop.
Optionally, obtaining an average value of all voltage drops, and recording the average value as an average voltage drop, includes:
storing the voltage drop into a second array after each voltage drop is obtained until all the voltage drops are stored into the second array;
and calculating the average value of all voltage drops in the second array, and recording the average value as the average voltage drop.
Optionally, until all voltage drops are stored in the second array, the method includes:
and recording the times of storing the voltage drop in the second array while storing the primary voltage drop in the second array, and determining to store all the voltage drops in the second array according to the recorded times.
Accordingly, the present invention also provides a monitoring device for monitoring the resistance of the electrical supply line of an ECU in an engine, the engine having a predetermined cylinder with at least one injection duration period, the device comprising: an acquisition unit and a judgment unit;
the acquisition unit is used for acquiring a plurality of voltage values of the power supply in any oil injection duration period, acquiring a difference value between a maximum value and a minimum value in the plurality of voltage values of the power supply, and recording the difference value as a voltage drop, wherein the difference between the maximum value in the acquired power supply voltage values and the actual power supply voltage maximum value in the oil injection duration period is within an allowable range, and the difference between the minimum value in the acquired power supply voltage values and the actual power supply voltage minimum value in the oil injection duration period is within the allowable range;
and the judging unit is used for determining that the resistance of a power supply line of the ECU is too large when the voltage drop is judged to be not less than the preset value.
Optionally, a preset cylinder of the engine has a plurality of oil injection duration periods, and before it is determined that the voltage drop is not less than a preset value, the obtaining unit is further configured to collect a plurality of voltage values of the power supply within a preset number of the oil injection duration periods, obtain a difference between a maximum value and a minimum value of the plurality of voltage values of the power supply corresponding to each oil injection duration period, and record the difference as the voltage drop;
wherein, the monitoring device still includes: and the calculating unit is used for calculating the average value of all voltage drops and recording the average value as the average voltage drop, wherein when the average voltage drop is judged to be not less than the preset value, the condition that the resistance of a power supply line of the ECU is too large is determined.
Optionally, the obtaining unit includes: the first storage module, the query module and the first calculation module:
the first storage module is used for storing a plurality of voltage values of the power supply corresponding to any one oil injection duration period into a first array;
the query module is used for searching the maximum value and the minimum value of a plurality of voltage values of the power supply in the first array;
the first calculation module is used for calculating the difference value between the maximum value and the minimum value of a plurality of voltage values of the power supply, and recording the difference value as voltage drop.
Optionally, the computing unit includes: the second storage module and the second calculation module;
the second storage module is used for storing the voltage drop into a second array after the voltage drop is obtained every time until all the voltage drops are stored into the second array;
the second calculating module is used for calculating the average value of all voltage drops in the second array and recording the average value as the average voltage drop.
Optionally, the obtaining unit further includes: a recording module;
the recording module is used for recording the times of storing the voltage drop in the second array while storing the primary voltage drop in the second array, and determining to store all the voltage drops in the second array according to the recorded times.
Compared with the prior art, the technical scheme provided by the invention at least has the following advantages:
the invention provides a monitoring method and a device, wherein the monitoring method comprises the following steps: collecting a plurality of voltage values of a power supply in any oil injection duration period, obtaining the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply, and recording the difference value as voltage drop, wherein the difference between the maximum value in the collected power supply voltage values and the actual power supply voltage maximum value in the oil injection duration period is within an allowable range, and the difference between the minimum value in the collected power supply voltage values and the actual power supply voltage minimum value in the oil injection duration period is within the allowable range; and when the voltage drop is judged to be not less than the preset value, determining that the resistance of the power supply line of the ECU is too large. According to the technical scheme provided by the invention, when the voltage drop is judged to be not less than the preset value, the fact that the resistance of the power supply line of the ECU is too large is determined, so that a fault can be timely reported according to the judgment result, a user is reminded to check, and further the phenomenon that the ECU is abnormal in working is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a monitoring method according to an embodiment of the present invention;
FIG. 2 is a graph of supply voltage versus time for a duration of fuel injection;
fig. 3 is a flowchart of a monitoring method according to another embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background art, in the prior art, the ECU cannot automatically monitor the line resistance state of the power supply line in real time, and the ECU often causes the excessive resistance of the power supply line due to the complicated power supply line, thereby causing the abnormal operation of the ECU.
Based on this, the application provides a monitoring method and a device, and the monitoring method comprises: collecting a plurality of voltage values of a power supply in any oil injection duration period, obtaining the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply, and recording the difference value as voltage drop, wherein the difference between the maximum value in the collected power supply voltage values and the actual power supply voltage maximum value in the oil injection duration period is within an allowable range, and the difference between the minimum value in the collected power supply voltage values and the actual power supply voltage minimum value in the oil injection duration period is within the allowable range; and when the voltage drop is judged to be not less than the preset value, determining that the resistance of the power supply line of the ECU is too large. According to the technical scheme provided by the invention, when the voltage drop is judged to be not less than the preset value, the fact that the resistance of the power supply line of the ECU is too large is determined, so that a fault can be timely reported according to the judgment result, a user is reminded to check, and further the phenomenon that the ECU is abnormal in working is avoided.
In order to achieve the above object, the technical solutions provided in the embodiments of the present application are described in detail below, specifically with reference to fig. 1 to 3.
Referring to fig. 1, fig. 1 is a flowchart of a monitoring method according to an embodiment of the present disclosure;
a monitoring method for use in electrical supply line resistance monitoring of an ECU in an engine having a predetermined block with at least one fuel injection on-duration period, the method comprising:
collecting a plurality of voltage values of a power supply in any one oil injection duration period, obtaining the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply, and recording the difference value as voltage drop, wherein the difference between the maximum value in the collected power supply voltage values and the maximum value of the actual power supply voltage in the oil injection duration period is within an allowable range, and the difference between the minimum value in the collected power supply voltage values and the minimum value of the actual power supply voltage in the oil injection duration period is within the allowable range;
and when the voltage drop is judged to be not less than the preset value, determining that the resistance of the power supply line of the ECU is too large.
It should be noted that the power supply provided by the embodiment of the present application is a power supply for supplying power to an ECU; the voltage value of the power supply is used for supplying power to the ECU, and the power supply is connected with the ECU through a power supply line of the ECU.
And the fuel injector is in a fuel injection state in the fuel injection duration period. During the oil injection duration period, the current in the ECU power supply line reaches a maximum value which is a known quantity, in this case, U is IR, wherein U is voltage drop, I is the current in the power supply line, and R is the line resistance of the ECU power supply line. Therefore, during the injection duration period, the theoretical limit value of the line resistance of the ECU power supply line can be set, and the voltage drop corresponding to the line resistance at the moment can be calculated according to the known current value in the ECU power supply line as a preset value. During subsequent monitoring, because the voltage drop is in a direct proportion relation with the line resistance of the ECU power supply line in the oil injection continuous period, when the collected voltage drop is not less than a preset value, the line resistance of the ECU power supply line is not less than the theoretical limit value of the line resistance of the ECU power supply line, and the condition that the line resistance of the ECU power supply line is too large can be determined.
In an embodiment of the present application, the power voltage value may be collected by an ADC (Analog-to-Digital Converter) in the ECU.
It can be understood that the "allowable range" in the "allowable range of the difference between the maximum value of the collected power voltage value and the actual power voltage maximum value in the oil injection duration period" and the "allowable range" of the "allowable range of the difference between the minimum value of the collected power voltage value and the actual power voltage minimum value in the oil injection duration period" provided in the embodiments of the present application are to ensure that the maximum value of the collected power voltage and the minimum value of the collected power voltage are both closest to or equal to the theoretical actual power voltage maximum value and the actual power voltage minimum value in the oil injection duration period, thereby ensuring that the obtained voltage drop precision is high and ensuring that the judgment result is high in accuracy.
It should be noted that, in the embodiment of the present application, a specific numerical range of the "allowable range" is not limited, and specific calculation needs to be performed according to actual applications.
The supply voltage profile during a fuel injection period is shown in fig. 2, which is approximately V-shaped, wherein the maximum value of the supply voltage occurs at the supply voltage at the start or end of the fuel injection period and the minimum value of the supply voltage is within the fuel injection period; therefore, the power supply voltage can be collected once every preset time within one oil injection duration period, and when the preset time is sufficiently short, enough power supply voltage can be collected so as to ensure that the maximum value of the collected power supply voltage and the minimum value of the collected power supply voltage are close to or equal to the maximum value of the actual power supply voltage and the minimum value of the actual power supply voltage.
In an embodiment of the present application, the number of the plurality of power voltages collected in the present application may be not less than 20, and further, it is ensured that the maximum value and the minimum value in the collected power voltages are infinitely close to or equal to the actual maximum value and the actual minimum value of the power voltages. The preset time of the acquisition interval provided by the embodiment of the application can be specifically designed and analyzed according to practical application, the preset time of each acquisition interval can be the same or different, the application is not particularly limited, and the preset time of the acquisition interval can be 10ms in the embodiment of the application. In addition, the present embodiment also does not specifically limit each of the injection duration periods provided, and the injection duration period may be 800ms in the present embodiment.
Further, in order to obtain more accurate voltage drop, the power supply voltage can be collected in a stepping mode. That is, collecting a plurality of voltage values of the power supply during any one of the injection duration periods includes: and starting to acquire a power supply voltage value while starting oil injection in the oil injection duration period, wherein the power supply voltage value is acquired once every the same preset time in a stepping mode until the oil injection duration period is finished, and the acquisition of the power supply voltage value is finished, so that the maximum value and the minimum value of the acquired power supply voltage are more accurate, and the voltage drop is more accurate.
In an embodiment of the present application, in order to perform a fault notification for a user, the method further includes: when determining that the power supply line of the ECU has overlarge resistance, reporting that the power supply line of the ECU has overlarge resistance, wherein the method comprises the following steps: and prompting on an instrument panel and/or alarming through sound.
In an embodiment of the present application, a plurality of voltage drops may be obtained and then an average value is obtained, and then line resistance monitoring is performed in a manner of determining the average value, so as to ensure that a monitoring result is more accurate, specifically as shown in fig. 3, a preset cylinder of the engine has a plurality of oil injection duration periods, where before determining that the voltage drop is not less than a preset value, the method further includes:
collecting a plurality of voltage values of a power supply in a preset number of oil injection duration periods, obtaining the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply corresponding to each oil injection duration period, and recording the difference value as voltage drop; the preset number of oil injection duration periods can be designed and analyzed according to practical application, and the application is not particularly limited; in the present embodiment, the preset number of injection duration periods may be not less than 10.
And calculating the average value of all voltage drops, and recording the average value as the average voltage drop, wherein when the average voltage drop is judged not to be less than the preset value, the over-resistance of the power supply line of the ECU is determined.
It will be appreciated that a plurality of voltage values of the power supply are collected over a preset number of said injection duration periods, including: collecting a plurality of voltage values of a power supply in each oil injection duration period in a plurality of oil injection duration periods of a preset cylinder body and in the process of continuously presetting a plurality of oil injection duration periods; or, within a plurality of oil injection duration periods of the preset cylinder, after at least one oil injection duration period is spaced, acquiring a plurality of voltage values of the power supply within the next oil injection duration period until the power supply voltage is acquired within a preset number of oil injection duration periods, wherein the number of the oil injection duration periods at each interval may be the same or different, and the application is not particularly limited.
In an embodiment of the present application, obtaining a difference between a maximum value and a minimum value of a plurality of voltage values of the power supply corresponding to any one of the fuel injection duration periods, which is denoted as a voltage drop, includes:
storing a plurality of voltage values of the power supply corresponding to any one oil injection duration period into a first array;
searching the maximum value and the minimum value of a plurality of voltage values of the power supply in the first array;
and calculating the difference value between the maximum value and the minimum value of the plurality of voltage values of the power supply, and recording the difference value as voltage drop.
In one embodiment of the present application, obtaining an average value of all voltage drops, and recording the average value as an average voltage drop, includes:
storing the voltage drop into a second array after each voltage drop is obtained until all the voltage drops are stored into the second array;
and calculating the average value of all voltage drops in the second array, and recording the average value as the average voltage drop.
In one embodiment of the present application, until all voltage drops are stored in the second array, the method includes:
and recording the times of storing the voltage drop in the second array while storing the primary voltage drop in the second array, and determining to store all the voltage drops in the second array according to the recorded times.
The embodiment of the application provides a monitoring device, is applied to ECU's power supply line resistance monitoring in the engine, the cylinder block that predetermines of engine has at least one oil injection duration, and the device includes: an acquisition unit and a judgment unit;
the acquisition unit is used for acquiring a plurality of voltage values of the power supply in any oil injection duration period, acquiring a difference value between a maximum value and a minimum value in the plurality of voltage values of the power supply, and recording the difference value as a voltage drop, wherein the difference between the maximum value in the acquired power supply voltage values and the actual power supply voltage maximum value in the oil injection duration period is within an allowable range, and the difference between the minimum value in the acquired power supply voltage values and the actual power supply voltage minimum value in the oil injection duration period is within the allowable range;
and the judging unit is used for determining that the resistance of a power supply line of the ECU is too large when the voltage drop is judged to be not less than a preset value.
It should be noted that the power supply provided by the embodiment of the present application is a power supply for supplying power to an ECU; the voltage value of the power supply is used for supplying power to the ECU, and the power supply is connected with the ECU through a power supply line of the ECU.
And the fuel injector is in a fuel injection state in the fuel injection duration period. And in the continuous oil injection period, the current in the ECU power supply line reaches the maximum value, which is a known quantity, at the moment, U is equal to IR, wherein U is voltage drop, I is the current in the power supply line, and R is the line resistance of the ECU power supply line. Therefore, during the injection duration period, the theoretical limit value of the line resistance of the ECU power supply line can be set, and the voltage drop corresponding to the line resistance at the moment can be calculated according to the known current value in the ECU power supply line and is used as the preset value. During subsequent monitoring, because the voltage drop is in a direct proportion relation with the line resistance of the ECU power supply line in the oil injection continuous period, when the collected voltage drop is not less than a preset value, the line resistance of the ECU power supply line is not less than the theoretical limit value of the line resistance of the ECU power supply line, and the condition that the line resistance of the ECU power supply line is too large can be determined.
In an embodiment of the present application, the collecting of the power voltage value may be performed by an ADC (Analog-to-Digital Converter) in the ECU.
It can be understood that the "allowable range" in the "allowable range of the difference between the maximum value of the collected power voltage value and the maximum value of the actual power voltage in the injection duration period" and the "allowable range" of the "allowable range of the difference between the minimum value of the collected power voltage value and the minimum value of the actual power voltage in the injection duration period" provided in the embodiments of the present application are to ensure that the maximum value of the collected power voltage and the minimum value of the collected power voltage are both closest to or equal to the theoretical maximum value of the actual power voltage and the actual minimum value of the actual power voltage in the injection duration period, thereby ensuring that the obtained voltage drop precision is high and ensuring that the judgment result is high in accuracy.
It should be noted that, in the embodiment of the present application, a specific numerical range of the "allowable range" is not limited, and specific calculation needs to be performed according to actual applications.
The supply voltage profile during a fuel injection period is shown in fig. 2, which is approximately V-shaped, wherein the maximum value of the supply voltage occurs at the supply voltage at the start or end of the fuel injection period and the minimum value of the supply voltage is within the fuel injection period; therefore, the power supply voltage can be collected once every preset time within one oil injection duration period, and when the preset time is sufficiently short, enough power supply voltage can be collected so as to ensure that the maximum value of the collected power supply voltage and the minimum value of the collected power supply voltage are close to or equal to the maximum value of the actual power supply voltage and the minimum value of the actual power supply voltage.
In an embodiment of the present application, the number of the plurality of power voltages collected in the present application may be not less than 20, and further, it is ensured that the maximum value and the minimum value of the collected power voltages are infinitely close to or equal to the actual maximum value and the actual minimum value of the power voltages. The preset time of the acquisition interval provided by the embodiment of the application can be specifically designed and analyzed according to practical application, the preset time of each acquisition interval can be the same or different, the application is not particularly limited, and the preset time of the acquisition interval can be 10ms in the embodiment of the application. In addition, the present embodiment also does not specifically limit the provided each injection duration period, and the injection duration period may be 800ms in the present embodiment.
Furthermore, in order to obtain more accurate voltage drop, the power supply voltage can be acquired in a stepping mode. That is, collecting a plurality of voltage values of the power supply during any one of the injection duration periods includes: and starting to acquire a power supply voltage value while starting oil injection in the oil injection duration period, wherein the power supply voltage value is acquired once every the same preset time in a stepping mode until the oil injection duration period is finished, and the acquisition of the power supply voltage value is finished, so that the maximum value and the minimum value of the acquired power supply voltage are more accurate, and the voltage drop is more accurate.
In an embodiment of the present application, in order to perform a fault notification for a user, the method further includes: the fault reporting unit is used for reporting the fault that the power supply line of the ECU is blocked excessively when the fact that the power supply line of the ECU is blocked excessively is determined, and comprises the following steps: and prompting on an instrument panel and/or alarming through sound.
In an embodiment of the present application, a plurality of voltage drops may be obtained, and then an average value is obtained, and then line resistance monitoring is performed in a manner of determining the average value, so as to ensure that a monitoring result is more accurate, a preset cylinder of the engine has a plurality of oil injection duration periods, before it is determined that the voltage drop is not less than a preset value, the obtaining unit is further configured to collect a plurality of voltage values of the power supply in a preset number of the oil injection duration periods, obtain a difference between a maximum value and a minimum value of the plurality of voltage values of the power supply corresponding to each oil injection duration period, and record the difference as the voltage drop, where the preset number of the oil injection duration periods may be designed and analyzed according to actual applications, and the present application is not particularly limited.
Wherein, the monitoring device still includes: and the calculating unit is used for calculating the average value of all voltage drops and recording the average value as the average voltage drop, wherein when the average voltage drop is judged to be not less than the preset value, the fact that the resistance of the power supply line of the ECU is too large is determined.
It will be appreciated that a plurality of voltage values of the power supply are collected over a preset number of said injection duration periods, including: collecting a plurality of voltage values of a power supply in each oil injection duration period in a plurality of oil injection duration periods of a preset cylinder body and in the process of continuously presetting a plurality of oil injection duration periods; or, within a plurality of oil injection duration periods of the preset cylinder, after at least one oil injection duration period is spaced, acquiring a plurality of voltage values of the power supply within the next oil injection duration period until the power supply voltage is acquired within a preset number of oil injection duration periods, wherein the number of the oil injection duration periods at each interval may be the same or different, and the application is not particularly limited.
In an embodiment of the present application, the obtaining unit includes: the system comprises a first storage module, a query module and a first calculation module;
the first storage module is used for storing a plurality of voltage values of the power supply corresponding to any one oil injection duration period into a first array;
the query module is used for searching the maximum value and the minimum value of a plurality of voltage values of the power supply in the first array;
the first calculation module is used for calculating the difference value between the maximum value and the minimum value of a plurality of voltage values of the power supply, and the difference value is recorded as voltage drop.
In one embodiment of the present application, the computing unit includes: the second storage module and the second calculation module;
the second storage module is used for storing the voltage drop into a second array after the voltage drop is obtained every time until all the voltage drops are stored into the second array;
the second calculating module is used for calculating the average value of all voltage drops in the second array and recording the average value as the average voltage drop.
In an embodiment of the application, the obtaining unit further includes: a recording module;
the recording module is used for recording the times of storing the voltage drop in the second array while storing the primary voltage drop in the second array, and determining to store all the voltage drops in the second array according to the recorded times.
The embodiment of the application provides a monitoring method and a monitoring device, wherein the monitoring method comprises the following steps: collecting a plurality of voltage values of a power supply in any oil injection duration period, obtaining the difference value between the maximum value and the minimum value in the voltage values of the power supply, and recording the difference value as voltage drop, wherein the difference between the maximum value in the collected power supply voltage values and the actual power supply voltage maximum value in the oil injection duration period is in an allowable range, and the difference between the minimum value in the collected power supply voltage values and the actual power supply voltage minimum value in the oil injection duration period is in the allowable range; and when the voltage drop is judged to be not less than the preset value, determining that the resistance of the power supply line of the ECU is too large. According to the technical scheme provided by the invention, when the voltage drop is judged to be not less than the preset value, the fact that the power supply line of the ECU is excessively blocked is determined, so that fault report can be timely made according to the judgment result, a user is reminded to check, and further the ECU is prevented from generating abnormity during working.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A monitoring method for electrical supply line resistance monitoring of an ECU in an engine, wherein a predetermined block of said engine has at least one injection duration period, the method comprising:
acquiring a plurality of voltage values of a power supply through a digital-to-analog converter (ADC) in the ECU in any oil injection duration period, acquiring a difference value between a maximum value and a minimum value of the plurality of voltage values of the power supply, and recording the difference value as a voltage drop, wherein the power supply voltage values are acquired once at the same preset time interval in a stepping mode, the difference between the maximum value of the acquired power supply voltage values and an actual power supply voltage maximum value in the oil injection duration period is within an allowable range, and the difference between the minimum value of the acquired power supply voltage values and the actual power supply voltage minimum value in the oil injection duration period is within the allowable range;
when the voltage drop is judged to be not less than a preset value, determining that the resistance of a power supply line of the ECU is too large;
the preset cylinder body of the engine is provided with a plurality of oil injection continuous periods, wherein before the voltage drop is judged to be not less than the preset value, the method further comprises the following steps:
collecting a plurality of voltage values of a power supply in a preset number of oil injection duration periods, obtaining the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply corresponding to each oil injection duration period, and recording the difference value as voltage drop;
and calculating the average value of all voltage drops, and recording the average value as the average voltage drop, wherein when the average voltage drop is judged to be not less than the preset value, the fact that the resistance of the power supply line of the ECU is too large is determined.
2. The method of claim 1, wherein obtaining a difference between a maximum value and a minimum value of a plurality of voltage values of said power source for any one of said injection on-time periods, denoted as a voltage drop, comprises:
storing a plurality of voltage values of the power supply corresponding to any one oil injection duration period into a first array;
searching the maximum value and the minimum value of a plurality of voltage values of the power supply in the first array;
and calculating the difference value between the maximum value and the minimum value of the plurality of voltage values of the power supply, and recording the difference value as voltage drop.
3. The method of claim 1, wherein obtaining an average of all voltage drops, denoted as average voltage drop, comprises:
storing the voltage drop into a second array after each voltage drop is obtained until all the voltage drops are stored into the second array;
and calculating the average value of all voltage drops in the second array, and recording the average value as the average voltage drop.
4. The method of claim 3, wherein storing all voltage drops until the second number of voltage drops is stored comprises:
and recording the times of storing the voltage drop in the second array while storing the primary voltage drop in the second array, and determining to store all the voltage drops in the second array according to the recorded times.
5. A monitoring device for the electrical supply line resistance monitoring of an ECU in an engine, characterized in that a predetermined block of said engine has at least one injection duration period, the device comprising: an acquisition unit and a judgment unit;
the acquisition unit is used for acquiring a plurality of voltage values of a power supply through a digital-to-analog converter (ADC) in the ECU in any oil injection duration period, acquiring a difference value between a maximum value and a minimum value of the plurality of voltage values of the power supply, and recording the difference value as a voltage drop, wherein the power supply voltage values are acquired once at the same preset time in a stepping mode, the difference between the maximum value of the acquired power supply voltage values and the actual maximum value of the power supply voltage in the oil injection duration period is within an allowable range, and the difference between the minimum value of the acquired power supply voltage values and the actual minimum value of the power supply voltage in the oil injection duration period is within the allowable range;
the judgment unit is used for determining that the resistance of a power supply line of the ECU is too large when the voltage drop is judged to be not less than a preset value;
the preset cylinder body of the engine is provided with a plurality of oil injection continuous periods, and before the voltage drop is judged to be not less than the preset value, the acquisition unit is further used for acquiring a plurality of voltage values of the power supply in the oil injection continuous periods of the preset number, acquiring the difference value between the maximum value and the minimum value in the plurality of voltage values of the power supply corresponding to each oil injection continuous period, and recording the difference value as the voltage drop;
wherein, the monitoring device still includes: and the calculating unit is used for calculating the average value of all voltage drops and recording the average value as the average voltage drop, wherein when the average voltage drop is judged to be not less than the preset value, the fact that the resistance of the power supply line of the ECU is too large is determined.
6. The monitoring device of claim 5, wherein the obtaining unit comprises: the system comprises a first storage module, a query module and a first calculation module;
the first storage module is used for storing a plurality of voltage values of the power supply corresponding to any one oil injection duration period into a first array;
the query module is used for searching the maximum value and the minimum value of a plurality of voltage values of the power supply in the first array;
the first calculation module is used for calculating the difference value between the maximum value and the minimum value of a plurality of voltage values of the power supply, and recording the difference value as voltage drop.
7. The monitoring device of claim 5, wherein the computing unit comprises: the second storage module and the second calculation module;
the second storage module is used for storing the voltage drop into a second array after the voltage drop is obtained every time until all the voltage drops are stored into the second array;
the second calculating module is used for calculating the average value of all voltage drops in the second array and recording the average value as the average voltage drop.
8. The monitoring device of claim 7, wherein the obtaining unit further comprises: a recording module;
the recording module is used for recording the times of storing the voltage drop in the second array while storing the primary voltage drop in the second array, and determining to store all the voltage drops in the second array according to the recorded times.
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