CN110985258B - High-pressure oil pump fault detection method and device - Google Patents
High-pressure oil pump fault detection method and device Download PDFInfo
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- CN110985258B CN110985258B CN201911396137.2A CN201911396137A CN110985258B CN 110985258 B CN110985258 B CN 110985258B CN 201911396137 A CN201911396137 A CN 201911396137A CN 110985258 B CN110985258 B CN 110985258B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The invention provides a method and a device for detecting faults of a high-pressure oil pump, wherein the method comprises the following steps: whether the engine is in a stable working condition or not is judged according to the engine operating parameters by obtaining the engine operating parameters; when the engine is judged to be in a stable working condition, whether the high-pressure oil pump is in a low working efficiency state or not is detected within a preset first time period; if the high-pressure oil pump is detected to be in the low working efficiency state, recording a second time period in which the high-pressure oil pump is in the low working efficiency state in the first time period; and if the ratio of the second time period to the first time period is greater than a first calibration value, outputting an alarm signal of the fault of the high-pressure oil pump. When the high-pressure oil pump is judged to be in a low working efficiency state under a stable working condition, the alarm signal of the fault of the high-pressure oil pump can be timely output, so that a driver can timely handle the fault of the high-pressure oil pump, and the running safety of an automobile is improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a device for detecting faults of a high-pressure oil pump.
Background
The high pressure common rail technology is a fuel supply mode that the generation of injection pressure and the injection process are completely separated from each other, a high pressure fuel is delivered to a common rail pipe by a high pressure fuel pump, and the oil pressure in the common rail pipe is accurately controlled, so that more and more large and medium-sized commercial automobiles and cars adopt a high pressure common rail type engine.
The high pressure oil pump adjusts the effective pressure distance of the plunger by rotating the axial angle of the plunger to achieve the purpose that the oil pump controls the oil pressure, the crankshaft of the engine rotates to drive the cam on the camshaft to rotate through the gear, the cam carries out a top-to-bottom periodic motion on the pulley on the ejector rod of the oil pump to lead the plunger to carry out reciprocating motion in the plunger sleeve, oil suction and oil pressing are completed under the matching of the two oil valves of the pump, the high pressure of more than 10MPa is generated instantly, diesel oil is sprayed into a machine body combustion chamber with nearly 60 atmospheric pressures through an oil spraying pipeline, an oil sprayer and the like to generate combustion explosion work, and rotary power is generated through mechanisms such as the cylinder, a piston connecting rod.
However, with the increase of the driving mileage of the automobile, the plunger, the cam, the oil valve and other devices on the high-pressure oil pump can be aged to a certain degree, so that the high-pressure oil pump has low efficiency and even has use faults.
Disclosure of Invention
The invention aims to provide a method and a device for detecting faults of a high-pressure oil pump, which are used for solving the problem that the running safety of a vehicle is influenced when a throttle valve sensor is in fault in the prior art.
In a first aspect, the present invention provides a method for detecting a fault of a high-pressure oil pump, including:
obtaining engine operation parameters, and judging whether the engine is in a stable working condition or not according to the engine operation parameters;
when the engine is judged to be in a stable working condition, whether the high-pressure oil pump is in a low working efficiency state or not is detected within a preset first time period;
if the high-pressure oil pump is detected to be in a low working efficiency state, recording a second time period in which the high-pressure oil pump is in the low working efficiency state within the first time period;
and if the ratio of the second time period to the first time period is greater than a first calibration value, outputting an alarm signal of the fault of the high-pressure oil pump.
In one possible design, the operating parameters include an engine speed change rate, an oil amount change rate, and an intake air amount change rate;
the judging whether the engine is in a stable working condition according to the engine operation parameters comprises the following steps:
and if the change rate of the engine speed is smaller than a second calibration value, the change rate of the oil quantity is smaller than a third calibration value and the change rate of the air inflow is smaller than a fourth calibration value, determining that the engine is in a stable working condition.
In one possible design, the detecting whether the high-pressure oil pump is in the low-efficiency state includes:
acquiring the rotating speed of the engine, the actual value of the rail pressure, the fuel injection quantity and the actual opening of the fuel quantity metering unit;
determining the theoretical opening of the oil quantity metering unit according to the rotating speed of the engine, the actual value of the rail pressure and the oil injection quantity;
and if the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is greater than a fourth calibration value, determining whether the high-pressure oil pump is in a low working efficiency state.
In one possible design, the determining the theoretical opening degree of the fuel quantity metering unit according to the engine speed, the rail pressure actual value and the fuel injection quantity includes:
recording the corresponding relation among the rotating speed of the engine, the rail pressure of the high-pressure oil pipe, the oil injection quantity and the opening of the oil quantity metering unit as a corresponding relation table;
and inquiring the corresponding relation table according to the rotating speed of the engine, the rail pressure of the high-pressure oil pipe and the oil injection quantity to determine the theoretical opening of the oil quantity metering unit.
In one possible design, the outputting the warning signal of the fault of the high-pressure oil pump includes:
and sending the alarm signal to a vehicle instrument panel or a central control screen so that the vehicle instrument panel or the central control screen displays a high-pressure oil pump fault icon.
In a second aspect, an embodiment of the present invention provides a high-pressure oil pump fault detection apparatus, based on any one of the high-pressure oil pump fault detection methods in the first aspect, including:
the judging module is used for acquiring the running parameters of the engine and judging whether the engine is in a stable working condition or not according to the running parameters of the engine;
the detection module is used for detecting whether the high-pressure oil pump is in a low working efficiency state within a preset first time period when the engine is judged to be in a stable working condition;
the recording module is used for recording a second time period when the high-pressure oil pump is in the low working efficiency state in the first time period if the high-pressure oil pump is detected to be in the low working efficiency state;
and the output module is used for outputting an alarm signal of the fault of the high-pressure oil pump if the ratio of the second time period to the first time period is greater than a first calibration value.
In one possible design, the determining module is specifically configured to determine that the engine is in a stable condition if the operating parameter of the engine meets a preset range, where the operating parameter includes a variation of the engine speed, the oil amount, and the air intake amount in a unit time.
In one possible design, the detection module is specifically configured to obtain an engine speed, an actual rail pressure value, an oil injection amount, and an actual opening degree of an oil amount metering unit;
determining the theoretical opening of the oil quantity metering unit according to the rotating speed of the engine, the actual value of the rail pressure and the oil injection quantity;
and if the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is greater than a fourth calibration value, determining whether the high-pressure oil pump is in a low working efficiency state.
In a possible design, the detection module is further specifically configured to record a correspondence between a rotation speed of the engine, a rail pressure of the high-pressure oil pipe, an oil injection amount, and an opening of the oil amount metering unit, as a correspondence table, and query the correspondence table according to the rotation speed of the engine, an actual value of the rail pressure, and the oil injection amount to determine a theoretical opening of the oil amount metering unit.
In a third aspect, an embodiment of the present invention provides an electronic control unit, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes computer-executable instructions stored by the memory such that the at least one processor performs the high pressure oil pump fault detection method of any of the first aspects.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for detecting a fault of a high-pressure oil pump according to any one of the first aspect is implemented.
According to the method and the device for detecting the fault of the high-pressure oil pump, whether the engine is in a stable working condition or not is judged by obtaining the operation parameters of the engine according to the operation parameters of the engine; when the engine is judged to be in a stable working condition, whether the high-pressure oil pump is in a low working efficiency state or not is detected within a preset first time period; if the high-pressure oil pump is detected to be in the low working efficiency state, recording a second time period in which the high-pressure oil pump is in the low working efficiency state in the first time period; and if the ratio of the second time period to the first time period is greater than a first calibration value, outputting an alarm signal of the fault of the high-pressure oil pump. When the high-pressure oil pump is judged to be in a low working efficiency state under a stable working condition, the alarm signal of the fault of the high-pressure oil pump can be timely output, so that a driver can timely handle the fault of the high-pressure oil pump, and the running safety of an automobile is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic view of an application scenario of a fault detection method for a high-pressure oil pump according to an embodiment of the present invention;
FIG. 2 is a first flowchart of a method for detecting a fault of a high-pressure oil pump according to an embodiment of the present invention;
FIG. 3 is a flow chart of a high-pressure oil pump fault detection method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a high-pressure oil pump fault detection device provided by an embodiment of the invention;
fig. 5 is a schematic diagram of a hardware structure of the electronic control unit according to the embodiment of the present invention.
Detailed Description
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Fig. 1 is a schematic view of an application scenario of a fault detection method for a high-pressure oil pump according to an embodiment of the present invention, as shown in fig. 1: the application scenarios of the high-pressure oil pump fault detection method in the embodiment of the invention comprise: an Electronic Control Unit (ECU) 101, a vehicle speed sensor 102, a rail pressure sensor 103, an injection amount sensor 104, and a central Control screen 105. The ECU101 is connected to a vehicle speed sensor 102, a rail pressure sensor 103, an injection amount sensor 104, and a center screen 105, respectively.
The ECU101 is composed of a microprocessor, a memory, an input/output interface, an analog-to-digital converter, and a large-scale integrated circuit such as a shaping circuit and a driving circuit, and is used for connecting a plurality of input/output circuits and monitoring various input data (such as braking, gear shifting and the like) and various running states (acceleration, slipping, oil consumption and the like) of the automobile at any time. The ECU101 obtains the current engine speed through the vehicle speed sensor 102, obtains the current rail pressure actual value according to the rail pressure sensor 103, obtains the automobile fuel injection quantity according to the fuel injection quantity sensor 104, and the ECU101 monitors whether the high-pressure oil pump breaks down or not according to the obtained engine speed, the rail pressure actual value and the automobile fuel injection quantity. If the high-pressure oil pump is judged to have a fault, the fault information is sent to the central control screen 105, and the central control screen 105 prompts a driver to control the running state of the vehicle according to the fault information of the high-pressure oil pump, so that the running safety of the vehicle is guaranteed.
The embodiment of the invention provides a high-pressure oil pump fault detection method, which is characterized in that whether a high-pressure oil pump is in a low working efficiency state or not is detected, whether the high-pressure oil pump is in the low working efficiency state or not is judged according to the rotating speed of an engine, an actual rail pressure value and the fuel injection quantity, and if the high-pressure oil pump is in the low working efficiency state and the performance of the engine is influenced, an alarm signal of the high-pressure oil pump fault is output, so that a driver can timely process the fault of the high-pressure oil pump, and the driving safety.
Fig. 2 is a first flowchart of a fault detection method for a high-pressure oil pump according to an embodiment of the present invention. The execution subject of the method of the present embodiment may be the ECU in fig. 1, as shown in fig. 2, and the high-pressure oil pump failure detection method includes the steps of:
s21: and acquiring engine operating parameters, and judging whether the engine is in a stable working condition or not according to the engine operating parameters.
When the rotating speed of the engine is stable and the rotating speed and the load of the engine do not change suddenly within a certain time, the engine is judged to be in a stable working condition, the engine is preheated and is in a normal running state, and the torque and the resisting torque of the engine are equal at the moment.
S22: and when the engine is judged to be in a stable working condition, detecting whether the high-pressure oil pump is in a low working efficiency state or not within a preset first time period.
The high-pressure oil pump is used for improving the fuel pressure and achieving a good atomization effect through high-pressure injection. However, with the increase of the driving mileage of the automobile, the plunger, the cam, the oil valve and other devices on the high-pressure oil pump have aging phenomena to a certain extent, so that the high-pressure oil pump has the problem of low working efficiency. If the high-pressure oil pump has low working efficiency, the atomization effect of high-pressure injection is influenced, and the performance of the engine is reduced.
When the engine is in a stable working condition, whether the high-pressure oil pump is in a low working efficiency state or not is detected within a preset first time period. The first time period refers to a period in which the engine is in a stable working condition, and the running state of the engine can be preliminarily judged by detecting the time in which the high-pressure oil pump is in a stable period and the working efficiency is low.
S23: and if the high-pressure oil pump is detected to be in the low working efficiency state, recording a second time period in which the high-pressure oil pump is in the low working efficiency state in the first time period.
When the engine is in a period of stable working condition, if the high-pressure oil pump is detected to be in a low working efficiency state, the time that the high-pressure oil pump is in the low working efficiency state is recorded in a first time period. And if the time that the high-pressure oil pump is in the low working efficiency state is a continuous time, recording the duration time that the high-pressure oil pump is in the low working efficiency state as a second time period. And if the time that the high-pressure oil pump is in the low working efficiency state is a plurality of intermittent time periods, recording the time of each time period, and accumulating all the time periods to be used as a second time period.
S24: and if the ratio of the second time period to the first time period is greater than a first calibration value, outputting an alarm signal of the fault of the high-pressure oil pump.
And calculating the ratio of the second time period to the first time period according to the second time period obtained in the step S23, wherein the calculated result can represent the percentage of the time that the high-pressure oil pump is in the low-working-efficiency state to the time of the stable working condition. The shorter the time that the high-pressure oil pump is in a low working efficiency state, the smaller the percentage occupied by the high-pressure oil pump is, which shows that the working efficiency of the high-pressure oil pump is more stable and the engine runs well. The longer the time that the high-pressure oil pump is in a low working efficiency state, the larger the percentage is, which indicates that the high-pressure oil pump may have a fault and the running performance of the engine is affected. According to the historical data of the working condition of the engine, when the percentage of the time of the high-pressure oil pump in the low working efficiency state to the time of the stable working condition is more than a certain proportion, the high-pressure oil pump breaks down, and the performance of the engine is influenced. And taking the certain proportion obtained according to the historical data as a first calibration value, and if the ratio of the second time period to the first time period is greater than the first calibration value, judging that the high-pressure oil pump has failed and the running performance of the engine has been affected. In order to avoid the influence on the running safety of the vehicle due to the fault of the high-pressure oil pump, when the ratio of the second time period to the first time period is greater than a first calibration value, an alarm signal of the fault of the high-pressure oil pump is output, a driver is prompted to check the vehicle in time, and the running safety of the vehicle is guaranteed.
According to the embodiment, whether the engine is in a stable working condition or not is judged by obtaining the engine operating parameters; when the engine is judged to be in a stable working condition, whether the high-pressure oil pump is in a low working efficiency state or not is detected within a preset first time period; if the high-pressure oil pump is detected to be in the low working efficiency state, recording a second time period in which the high-pressure oil pump is in the low working efficiency state in the first time period; and if the ratio of the second time period to the first time period is greater than a first calibration value, outputting an alarm signal of the fault of the high-pressure oil pump. When the high-pressure oil pump is judged to be in a low working efficiency state under a stable working condition, the alarm signal of the fault of the high-pressure oil pump can be timely output, so that a driver can timely handle the fault of the high-pressure oil pump, and the running safety of an automobile is improved.
In one embodiment of the invention, the operating parameters include an engine speed change rate, an oil amount change rate, and an intake air amount change rate; and judging whether the engine is in a stable working condition or not according to the engine operation parameters, wherein the step of determining that the engine is in the stable working condition if the engine rotating speed change rate is smaller than a second calibration value, the oil quantity change rate is smaller than a third calibration value and the air intake quantity change rate is smaller than a fourth calibration value is included.
When the engine is in a steady state condition, the rate of change of the operating parameters of the vehicle is relatively small. According to the embodiment of the invention, the rotating speed of the engine is obtained according to the vehicle speed sensor, the rail pressure actual value is obtained according to the rail pressure sensor, the fuel injection quantity of the automobile is obtained according to the fuel injection quantity sensor, and the operating condition of the engine is monitored by obtaining the rotating speed change rate, the fuel quantity change rate and the air intake quantity change rate of the engine as the operating parameters of the automobile. When the change rate of the engine speed, the change rate of the oil quantity and the change rate of the air inflow are respectively smaller than a certain proportion, the stable engine speed is indicated, and the engine is under the stable working condition. When the engine is in a stable working condition, according to historical data of the working condition of the engine, acquiring an upper limit of the change rate of the rotating speed of the engine as a second calibration value, acquiring an upper limit of the change rate of the oil quantity as a third calibration value, and acquiring an upper limit of the change rate of the air inflow as a fourth calibration value, and if the change rate of the rotating speed of the engine is smaller than the second calibration value, the change rate of the oil quantity is smaller than the third calibration value, and the change rate of the air inflow is smaller than the fourth calibration value, determining that the engine is in the stable working condition.
According to the embodiment, the current running state of the engine can be judged by judging the conditions of the engine speed change rate, the oil quantity change rate and the air intake quantity change rate without adding a new device on the basis of the existing vehicle hardware by acquiring the running parameters of the vehicle, including the engine speed change rate, the oil quantity change rate and the air intake quantity change rate. When the change rate of the engine speed is smaller than the second calibration value, the change rate of the oil quantity is smaller than the third calibration value and the change rate of the air inflow is smaller than the fourth calibration value, the engine can be judged to be in a stable working condition.
Fig. 3 is a flowchart of a second method for detecting a fault of a high-pressure oil pump according to an embodiment of the present invention, where on the basis of the embodiment of fig. 2, as shown in fig. 3, in step S22, the method for detecting whether the high-pressure oil pump is in a low-efficiency working state specifically includes:
s31: and acquiring the rotating speed of the engine, the actual value of the rail pressure, the fuel injection quantity and the actual opening degree of the fuel quantity metering unit.
The running speed of the engine is monitored through a vehicle speed sensor to obtain the rotating speed of the engine, the high-pressure common rail is monitored through a rail pressure sensor to obtain an actual rail pressure value, the fuel injection quantity is monitored through a fuel injection quantity sensor to obtain the fuel injection quantity, and the current actual opening of a fuel quantity metering unit is obtained. In the normal running process of the vehicle, the rotating speed of an engine, the rail pressure of a high-pressure oil pipe and the oil injection quantity are adjusted by controlling the opening of a valve of an oil quantity metering unit according to the vehicle speed control requirement of the vehicle.
S32: and determining the theoretical opening of the oil quantity metering unit according to the rotating speed of the engine, the actual value of the rail pressure and the oil injection quantity.
In one embodiment of the invention, the determining the theoretical opening degree of the oil quantity metering unit according to the engine speed, the rail pressure actual value and the oil injection quantity comprises the following steps:
recording the corresponding relation among the rotating speed of the engine, the rail pressure of the high-pressure oil pipe, the oil injection quantity and the opening of the oil quantity metering unit as a corresponding relation table; and inquiring a corresponding relation table according to the rotating speed of the engine, the rail pressure of the high-pressure oil pipe and the oil injection quantity to determine the theoretical opening of the oil quantity metering unit.
The high pressure oil pump adjusts the effective pressure distance of the plunger by rotating the axial angle of the plunger to achieve the purpose that the oil pump controls the oil pressure, the crankshaft of the engine rotates to drive the cam on the camshaft to rotate through the gear, the cam carries out a top-to-bottom periodic motion on the pulley on the ejector rod of the oil pump to lead the plunger to carry out reciprocating motion in the plunger sleeve, oil suction and oil pressing are completed under the matching of the two oil valves of the pump, the high pressure of more than 10MPa is generated instantly, diesel oil is sprayed into a machine body combustion chamber with nearly 60 atmospheric pressures through an oil spraying pipeline, an oil sprayer and the like to generate combustion explosion work, and rotary power is generated through mechanisms such as the cylinder, a piston connecting rod.
When the vehicle is in a stable working condition, the engine runs in a good state, and when the fuel injector and the pressure regulating valve do not leak, the corresponding relation between the engine rotating speed, the rail pressure actual value and the fuel injection quantity and the theoretical opening of the fuel quantity metering unit can be obtained according to the characteristics of the power section and the rail pressure of the vehicle leaving the factory. And under the condition that the oil injector and the pressure regulating valve do not leak, the rotating speed of the engine, the rail pressure of the high-pressure oil pipe and the oil injection quantity are regulated by controlling the opening of a valve of the oil quantity metering unit according to the vehicle speed control requirement of the vehicle. When the rail pressure of the high-pressure oil pipe is reduced, the oil injection quantity of the oil injector causes the rotating speed of the engine to be reduced. Under the condition that other performances of the engine run well, the rotating speed of the engine, the rail pressure of the high-pressure oil pipe and the oil injection quantity are in linear corresponding relation, and the rotating speed of the engine, the rail pressure of the high-pressure oil pipe and the oil injection quantity can be controlled by adjusting the opening of the oil quantity measuring unit. Correspondingly, the control opening degree of the oil quantity metering unit can be obtained according to the rotating speed of the engine, the actual value of the rail pressure and the fuel injection quantity, and the control opening degree of the oil quantity metering unit is used as the theoretical opening degree.
S33: and if the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is greater than a fourth calibration value, determining whether the high-pressure oil pump is in a low working efficiency state.
When the high-pressure oil pump is in a low working efficiency state, the rotating speed of the engine cannot meet the running speed requirement of the vehicle under the control of the theoretical opening degree of the oil quantity metering unit according to the running speed requirement of the vehicle. In order to meet the requirement of the running speed of the vehicle, the actual control opening degree of the oil quantity metering unit needs to be increased, the oil injection quantity of the oil injector needs to be increased, the rail pressure of the high-pressure oil pipe needs to be increased, and the rotating speed of the engine needs to be increased. According to the historical driving data of the vehicle, when the high-pressure oil pump fails, the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit exceeds the upper limit, and the upper limit of the difference value is used as a fourth calibration value. When the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is smaller than or equal to a fourth calibration value, the fact that the working efficiency of the high-pressure oil pump is low at the moment but a fault does not occur is shown; when the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is larger than the fourth calibration value, the working efficiency of the high-pressure oil pump is low and a fault occurs, and the running safety of a vehicle is influenced.
As can be seen from the above embodiments, the theoretical opening degree of the oil amount metering unit is determined according to the engine speed, the rail pressure actual value, and the injected oil amount, and when the difference between the actual opening degree of the oil amount metering unit and the theoretical opening degree of the oil amount metering unit is greater than the fourth calibrated value, it is determined that the high-pressure oil pump is faulty. On the basis of the existing vehicle configuration, the embodiment of the invention does not need to additionally add a device, judges whether the high-pressure oil pipe has a fault or not according to the engine speed, the rail pressure actual value and the oil injection quantity of the vehicle, reduces the design cost and the production cost, and ensures the running safety of the vehicle.
In one embodiment of the present invention, the outputting of the warning signal of the failure of the high pressure oil pump in step S24 includes: and sending the alarm signal to a vehicle instrument panel or a central control screen so that the vehicle instrument panel or the central control screen displays a high-pressure oil pump fault icon.
The alarm signal is sent to an instrument panel or a central control screen of the vehicle, and a high-pressure oil pump fault icon is displayed on the instrument panel or the central control screen of the vehicle to prompt a driver that the current high-pressure oil rail has a fault and needs to be detected and cleared in time. If the alarm signal of the fault of the high-pressure oil pump is output, the fault of the high-pressure oil pump is shown, even if other fault detection results of the vehicle are displayed normally, the fault of the vehicle is not prompted, the high-pressure oil pump needs to be checked when the alarm signal of the fault of the high-pressure oil pump is received, and potential safety hazards are eliminated by determining the fault position and maintaining or replacing a fault device.
According to the embodiment, the alarm signal is sent to the vehicle instrument panel or the central control screen, the fault icon of the high-pressure oil pump is displayed to remind a driver of the fault of the high-pressure oil pump, the fault is timely detected and eliminated, and the running safety of the vehicle is guaranteed.
Fig. 4 is a first structural schematic diagram of the high-pressure oil pump fault detection device provided by the embodiment of the invention. As shown in fig. 4, the high-pressure oil pump failure detection device 40 includes: a judging module 401, a detecting module 402, a recording module 403 and an output module 404.
The judging module 401 is configured to obtain an engine operation parameter, and judge whether the engine is in a stable working condition according to the engine operation parameter;
the detection module 402 is used for detecting whether the high-pressure oil pump is in a low working efficiency state within a preset first time period when the engine is judged to be in a stable working condition;
the recording module 403 is configured to record a second time period from when the high-pressure oil pump is in the low working efficiency state within the first time period if it is detected that the high-pressure oil pump is in the low working efficiency state;
and the output module 404 is configured to output an alarm signal of a fault of the high-pressure oil pump if a ratio of the second time period to the first time period is greater than a first calibration value.
In an embodiment of the present invention, the determining module 401 is specifically configured to determine that the operation parameters include an engine speed change rate, an oil amount change rate, and an intake air amount change rate, and determine that the engine is in a stable working condition if the operation parameters of the engine meet a preset range, where the operation parameters include engine speed, oil amount, and an amount of change of the intake air amount in a unit time.
In an embodiment of the present invention, the detecting module 402 is specifically configured to obtain an actual opening degree of the engine speed, the rail pressure actual value, the fuel injection amount, and the fuel amount metering unit;
determining the theoretical opening of the oil quantity metering unit according to the rotating speed of the engine, the actual value of the rail pressure and the oil injection quantity;
and if the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is greater than a fourth calibration value, determining whether the high-pressure oil pump is in a low working efficiency state.
In an embodiment of the present invention, the detecting module 402 is further specifically configured to determine the theoretical opening degree of the oil amount metering unit according to the engine speed, the rail pressure actual value, and the oil injection amount, where the determining includes:
recording the corresponding relation among the rotating speed of the engine, the rail pressure of the high-pressure oil pipe, the oil injection quantity and the opening of the oil quantity metering unit as a corresponding relation table;
and inquiring the corresponding relation table according to the rotating speed of the engine, the rail pressure of the high-pressure oil pipe and the oil injection quantity to determine the theoretical opening of the oil quantity metering unit.
In an embodiment of the present invention, the output module 404 is specifically configured to send the alarm signal to a dashboard or a central control screen of the vehicle, so that the dashboard or the central control screen of the vehicle displays a high-pressure oil pump failure icon.
The apparatus provided in this embodiment may be used to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
The fault detection device for the high-pressure oil pump provided by the invention has the advantages that the running parameters of the engine are obtained, and whether the engine is in a stable working condition or not is judged according to the running parameters of the engine; when the engine is judged to be in a stable working condition, whether the high-pressure oil pump is in a low working efficiency state or not is detected within a preset first time period; if the high-pressure oil pump is detected to be in the low working efficiency state, recording a second time period in which the high-pressure oil pump is in the low working efficiency state in the first time period; and if the ratio of the second time period to the first time period is greater than a first calibration value, outputting an alarm signal of the fault of the high-pressure oil pump. When the high-pressure oil pump is judged to be in a low working efficiency state under a stable working condition, the alarm signal of the fault of the high-pressure oil pump can be timely output, so that a driver can timely handle the fault of the high-pressure oil pump, and the running safety of an automobile is improved.
Fig. 5 is a schematic diagram of a hardware structure of the electronic control unit according to the embodiment of the present invention. As shown in fig. 5, the high-pressure oil pump failure detection apparatus 50 of the present embodiment includes: a processor 501 and a memory 502; wherein:
a memory 502 for storing computer-executable instructions;
a processor 501 for executing computer-executable instructions stored in the memory to implement the steps performed by the ECU101 in the above-described embodiments.
Reference may be made in particular to the description relating to the method embodiments described above.
In one possible design, memory 502 may be separate or integrated with processor 501.
When the memory 502 is provided separately, the high-pressure oil pump failure detection apparatus further includes a bus 503 for connecting the memory 502 and the processor 501.
Embodiments of the present invention also provide a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for detecting a fault of a high-pressure oil pump as described above is implemented.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods described in the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for detecting a fault of a high-pressure oil pump, comprising:
obtaining engine operation parameters, and judging whether the engine is in a stable working condition or not according to the engine operation parameters;
when the engine is judged to be in a stable working condition, whether the high-pressure oil pump is in a low working efficiency state or not is detected within a preset first time period;
if the high-pressure oil pump is detected to be in a low working efficiency state, recording a second time period in which the high-pressure oil pump is in the low working efficiency state within the first time period;
if the ratio of the second time period to the first time period is greater than a first calibration value, outputting an alarm signal of the fault of the high-pressure oil pump;
wherein the content of the first and second substances,
the detection whether the high-pressure oil pump is in a low working efficiency state comprises the following steps:
acquiring the rotating speed of the engine, the actual value of the rail pressure, the fuel injection quantity and the actual opening of the fuel quantity metering unit;
determining the theoretical opening of the oil quantity metering unit according to the rotating speed of the engine, the actual value of the rail pressure and the oil injection quantity;
and if the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is greater than a fourth calibration value, determining whether the high-pressure oil pump is in a low working efficiency state.
2. The method of claim 1, wherein the operating parameters include a rate of change of engine speed, a rate of change of oil quantity, and a rate of change of intake air quantity;
the judging whether the engine is in a stable working condition according to the engine operation parameters comprises the following steps:
and if the change rate of the engine speed is smaller than a second calibration value, the change rate of the oil quantity is smaller than a third calibration value and the change rate of the air inflow is smaller than a fourth calibration value, determining that the engine is in a stable working condition.
3. The method of claim 1, wherein determining the theoretical opening of the fuel quantity metering unit according to the engine speed, the rail pressure actual value and the fuel injection quantity comprises:
recording the corresponding relation among the rotating speed of the engine, the rail pressure of a high-pressure oil pipe, the oil injection quantity and the opening of the oil quantity metering unit as a corresponding relation table;
and inquiring the corresponding relation table according to the rotating speed of the engine, the rail pressure of the high-pressure oil pipe and the oil injection quantity to determine the theoretical opening of the oil quantity metering unit.
4. The method according to any one of claims 1 to 3, wherein the outputting of the warning signal of the failure of the high-pressure oil pump includes:
and sending the alarm signal to a vehicle instrument panel or a central control screen so that the vehicle instrument panel or the central control screen displays a high-pressure oil pump fault icon.
5. A high-pressure oil pump failure detection device, characterized by comprising:
the judging module is used for acquiring the running parameters of the engine and judging whether the engine is in a stable working condition or not according to the running parameters of the engine;
the detection module is used for detecting whether the high-pressure oil pump is in a low working efficiency state within a preset first time period when the engine is judged to be in a stable working condition;
the recording module is used for recording a second time period when the high-pressure oil pump is in the low working efficiency state in the first time period if the high-pressure oil pump is detected to be in the low working efficiency state;
the output module is used for outputting an alarm signal of the fault of the high-pressure oil pump if the ratio of the second time period to the first time period is greater than a first calibration value;
wherein the content of the first and second substances,
the detection module is specifically used for acquiring the rotating speed of the engine, the actual value of the rail pressure, the fuel injection quantity and the actual opening of the fuel quantity metering unit; determining the theoretical opening of the oil quantity metering unit according to the rotating speed of the engine, the actual value of the rail pressure and the oil injection quantity; and if the difference value between the actual opening of the oil quantity metering unit and the theoretical opening of the oil quantity metering unit is greater than a fourth calibration value, determining whether the high-pressure oil pump is in a low working efficiency state.
6. The apparatus of claim 5,
the judging module is specifically used for judging that the operation parameters comprise the change rate of the engine speed, the change rate of the oil quantity and the change rate of the air inflow, and if the operation parameters of the engine accord with the preset range, the engine is in a stable working condition, wherein the operation parameters comprise the change amounts of the engine speed, the oil quantity and the air inflow in unit time.
7. An electronic control unit, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the high pressure oil pump fault detection method of any one of claims 1 to 4.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein computer-executable instructions that, when executed by a processor, implement the high-pressure oil pump fault detection method according to any one of claims 1 to 4.
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| CN113094873B (en) * | 2021-03-15 | 2023-04-07 | 中联重科股份有限公司 | Stable working condition identification method, working condition evaluation method and concrete pumping equipment |
| CN113494600B (en) * | 2021-07-26 | 2022-08-23 | 潍柴动力股份有限公司 | Abnormity diagnosis method and device |
| CN114252195B (en) * | 2021-11-22 | 2023-12-15 | 潍柴动力股份有限公司 | Rail pressure credibility detection method, device, storage medium and equipment |
| CN114876690B (en) * | 2022-06-16 | 2023-06-23 | 潍柴动力股份有限公司 | Fault detection device and fault detection method for oil sprayer |
| CN115030830A (en) * | 2022-06-20 | 2022-09-09 | 中国第一汽车股份有限公司 | Fault diagnosis method for variable-pressure low-pressure fuel pump |
| CN117705452B (en) * | 2024-02-05 | 2024-05-17 | 潍柴动力股份有限公司 | Fault detection method and device for pulsation buffer and engine control system |
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| KR100977393B1 (en) * | 2008-10-06 | 2010-08-20 | 콘티넨탈 오토모티브 시스템 주식회사 | System and method for diagonsisng error of fuel pump of vehicle |
| JP5059894B2 (en) * | 2010-03-19 | 2012-10-31 | 日立オートモティブシステムズ株式会社 | Fuel pump control device |
| CN102678355B (en) * | 2012-05-04 | 2015-11-18 | 联合汽车电子有限公司 | Automobile oil injection control system and method |
| CN108678938B (en) * | 2018-05-09 | 2019-12-17 | 中国人民解放军空军工程大学 | Performance degradation test method for airborne fuel pump |
| CN110500217B (en) * | 2019-07-23 | 2021-07-27 | 南京航空航天大学 | Diesel engine common rail system oil pump fault detection method based on measurable data characteristics |
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