CN111365138B - Rail pressure control method and device - Google Patents
Rail pressure control method and device Download PDFInfo
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- CN111365138B CN111365138B CN202010229691.8A CN202010229691A CN111365138B CN 111365138 B CN111365138 B CN 111365138B CN 202010229691 A CN202010229691 A CN 202010229691A CN 111365138 B CN111365138 B CN 111365138B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
- F02D2041/223—Diagnosis of fuel pressure sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a rail pressure control method and a device, wherein the method comprises the following steps: acquiring a rail pressure parameter sent by a first rail pressure sensor connected with a main ECU; judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters; if the first rail pressure sensor is in a fault state, judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state; and if the second rail pressure sensor is not in a fault state, adjusting the fuel flow of the fuel pump based on an actual rail pressure value sent by the ECU so as to control the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the ECU according to the second rail pressure sensor. By applying the method provided by the invention, under the condition that the first rail pressure sensor is in a fault state and the second rail pressure sensor is not in the fault state, the rail pressure is controlled in a closed-loop control mode, and the stability of the performance of the engine can be effectively ensured.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to a rail pressure control method and device.
Background
With the development of industrial technologies, people have higher and higher performance requirements on engines, in order to maintain the normal operation of the engines, an Engine management system needs to be equipped for the engines, and the Control core of the Engine management system is an Electronic Control Unit (ECU), however, with the popularization of high horsepower engines, a single ECU cannot meet the requirements of the high horsepower engines, so that the dual ECU technology is gradually widely applied, wherein the dual ECU technology can be applied to Control the rail pressure of the engines.
In the prior art, when the dual-ECU is used for controlling the rail pressure, the master ECU and the slave ECU are respectively connected with different rail pressure sensors, so that communication delay between the master ECU and the slave ECU can be reduced, the precision of fuel injection of the fuel pump can be effectively improved, however, when the rail pressure sensor connected with the master ECU breaks down, the master ECU can control the rail pressure in an open-loop control mode in order to avoid abnormal operation of an engine, under the condition, the rail pressure cannot be set according to working conditions, the power and the rotating speed of the engine are limited, and the performance stability of the engine is influenced.
Disclosure of Invention
The invention aims to provide a rail pressure control method which can effectively guarantee the stability of the performance of an engine.
The invention also provides a rail pressure control device for ensuring the realization and application of the method in practice.
A rail pressure control method is applied to a main Electronic Control Unit (ECU), and comprises the following steps:
acquiring rail pressure parameters sent by a first rail pressure sensor connected with the main ECU;
judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters;
if the first rail pressure sensor is in a fault state, judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state;
and if the second rail pressure sensor is not in a fault state, adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU so as to realize the control of the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor.
Optionally, the above method, wherein the determining, according to the rail pressure parameter, whether the first rail pressure sensor is in an abnormal state includes:
judging whether the sampling voltage value in the rail pressure parameter is larger than a preset first threshold value or not;
judging whether the sampling voltage value is smaller than a preset second threshold value or not, wherein the second threshold value is smaller than the first threshold value;
judging whether the state code of the analog-to-digital conversion ADC circuit in the rail pressure parameter is matched with a preset abnormal state code or not;
judging whether the difference value of the sampling voltages is larger than a preset third threshold value or not, wherein the difference value of the sampling voltages is determined according to the sampling voltage values and a prestored historical sampling voltage value;
and when any judgment result of the judgment is yes, judging that the first rail pressure sensor is in an abnormal state.
The foregoing method, optionally after determining that the first rail pressure sensor is in the fault state, further includes:
and generating alarm information corresponding to the first rail pressure sensor, and displaying the alarm information.
The method described above, optionally, further includes:
and if the second rail pressure sensor is in an abnormal state, enabling the fuel flow of the fuel pump to be at the maximum value so as to realize the control of the rail pressure in an open-loop mode.
The method described above, optionally, adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent from the ECU, includes:
comparing the actual rail pressure value with a preset standard rail pressure value, and judging whether the actual rail pressure value is consistent with the standard rail pressure value;
if the rail pressure values are inconsistent, determining a difference value between the actual rail pressure value and the standard rail pressure value;
searching a preset relation table based on the difference value to obtain a fuel flow adjusting coefficient corresponding to the difference value;
and adjusting the fuel flow of the fuel pump by applying the fuel flow adjusting coefficient.
A rail pressure control device applied to a main Electronic Control Unit (ECU), the device comprising:
the first acquisition unit is used for acquiring rail pressure parameters sent by a first rail pressure sensor connected with the main ECU;
the first judging unit is used for judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters;
the second judgment unit is used for judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state or not when the first rail pressure sensor is in the fault state;
and the adjusting unit is used for adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU when the second rail pressure sensor is not in a fault state so as to realize the control of the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor.
Optionally, the apparatus described above, wherein the first determining unit includes:
the first judgment subunit is used for judging whether the sampling voltage value in the rail pressure parameter is greater than a preset first threshold value or not;
the second judgment subunit is configured to judge whether the sampling voltage value is smaller than a preset second threshold, where the second threshold is smaller than the first threshold;
the third judging subunit is used for judging whether the state code of the analog-to-digital conversion ADC circuit in the rail pressure parameter is matched with a preset abnormal state code;
the fourth judgment subunit is configured to judge whether a sampling voltage difference value is greater than a preset third threshold, where the sampling voltage difference value is determined according to the sampling voltage value and a prestored historical sampling voltage value;
and the judging unit is used for judging that the first rail pressure sensor is in an abnormal state when any judgment result of the judgment is yes.
The above apparatus, optionally, further comprises:
and the generating unit is used for generating alarm information corresponding to the first rail pressure sensor and displaying the alarm information.
The above apparatus, optionally, further comprises:
and the control unit is used for enabling the fuel flow of the fuel pump to be at the maximum value when the second rail pressure sensor is in an abnormal state so as to realize the control of the rail pressure in an open-loop mode.
The above apparatus, optionally, the adjusting unit includes:
a fifth judging subunit, configured to compare the actual rail pressure value with a preset standard rail pressure value, and judge whether the actual rail pressure value is consistent with the standard rail pressure value;
a determining subunit, configured to determine, when the actual rail pressure value is inconsistent with the standard rail pressure value, a difference between the actual rail pressure value and the standard rail pressure value;
the searching subunit is used for searching a preset relation table based on the difference value so as to obtain a fuel flow adjusting coefficient corresponding to the difference value;
and the adjusting subunit is used for adjusting the fuel flow of the fuel pump by applying the fuel flow adjusting coefficient.
Compared with the prior art, the invention has the following advantages:
the invention provides a rail pressure control method and a rail pressure control device, which are applied to a main Electronic Control Unit (ECU), wherein the method comprises the following steps: acquiring rail pressure parameters sent by a first rail pressure sensor connected with the main ECU; judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters; if the first rail pressure sensor is in a fault state, judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state; and if the second rail pressure sensor is not in a fault state, adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU so as to control the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor. By applying the method provided by the embodiment of the invention, under the condition that the first rail pressure sensor is in the fault state, the actual rail pressure value can be obtained through the second rail pressure sensor which is not in the fault state, and the fuel flow of the fuel pump is adjusted according to the rail pressure value, so that the rail pressure degradation control can be avoided, and the running stability of the engine is effectively ensured.
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 flow chart of a method of controlling rail pressure according to the present invention;
FIG. 2 is a flow chart of a process for adjusting fuel flow to a fuel pump provided by the present invention;
FIG. 3 is a flow chart of another method of a rail pressure control method according to the present invention;
fig. 4 is a schematic structural diagram of a rail pressure control device provided by 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.
The invention is operational with numerous general purpose or special purpose computing device environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multi-processor appliances, distributed computing environments that include any of the above devices or equipment, and the like.
The embodiment of the invention provides a rail pressure control method, which can be applied to an Electronic Control Unit (ECU), wherein the method has a flow chart shown in figure 1 and specifically comprises the following steps:
s101: and acquiring the rail pressure parameter of a first rail pressure sensor connected with the main ECU.
In the method provided by the embodiment of the present invention, the rail pressure parameter may include a sampling voltage value of the first rail pressure sensor, a state parameter of the analog-to-digital conversion ADC circuit, and the like, and the main ECU may obtain the rail pressure parameter of the first rail pressure sensor according to a preset period.
The sampling voltage value can be obtained by measuring a common rail pipe of the engine by a first rail pressure sensor, and the first rail pressure sensor is used for measuring pressure in the common rail pipe of the engine, namely rail pressure.
S102: and judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters, if not, executing S103, and if so, executing S104.
In the method provided by the embodiment of the invention, whether the first rail pressure sensor is in a fault state is judged according to the sampling voltage value in the rail pressure parameter and the state parameter of the analog-to-digital conversion ADC circuit.
Specifically, whether the sampling voltage value is abnormal or not and whether the state parameter of the analog-to-digital conversion ADC circuit is abnormal or not can be judged, and when the sampling voltage value is abnormal or the state parameter of the analog-to-digital conversion ADC circuit is abnormal, it is determined that the first rail pressure sensor is in a fault state.
S103: and determining an actual rail pressure value according to the sampling voltage value in the rail pressure parameter, and adjusting the fuel flow of the fuel pump by using the actual rail pressure value.
In the method provided by the embodiment of the invention, when the first rail pressure sensor is not abnormal, the actual voltage value corresponding to the first rail pressure sensor can be applied to adjust the fuel flow of the fuel pump, so that the closed-loop control of the rail pressure can be realized.
S104: and (4) judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state, if so, executing S105, and if not, executing S106.
In the method provided by the embodiment of the invention, when the first rail pressure sensor is in the fault state, whether the second rail pressure sensor is in the fault state is determined according to the state information of the second rail pressure sensor, which is sent from the ECU, and the state information represents whether the second rail pressure sensor is in the fault state.
For example, binary numbers 0 and 1 may respectively represent the state of the second rail pressure sensor, where 0 may represent that the second rail pressure sensor is in a normal state and 1 may represent that the second rail pressure sensor is in an abnormal state.
Specifically, the slave ECU acquires the rail pressure parameter sent by the second rail pressure sensor, determines whether the second rail pressure sensor is in an abnormal state according to the rail pressure parameter of the second rail pressure sensor, obtains the state information of the second rail pressure sensor by determining the rail pressure parameter of the second rail pressure sensor, and sends the state information to the master ECU.
The slave ECU can also directly send the acquired rail pressure parameters of the second rail pressure sensor to the master ECU, and the master ECU judges whether the second rail pressure sensor is in a fault state or not according to the rail pressure parameters of the second rail pressure sensor.
S105: and enabling the fuel flow of the fuel pump to be at the maximum value so as to control the rail pressure in an open loop mode.
In the method provided by the embodiment of the invention, under the condition that the first rail pressure sensor is in an abnormal state, if the second rail pressure sensor is in an abnormal state, the fuel pump of the engine can be controlled to operate at the maximum flow rate, so that the pressure in the fuel pipeline is increased, after the pressure in the fuel pipeline is increased to a certain degree, the safety valve in the fuel pipeline can be flushed, the fuel pump continues to operate at the maximum flow rate after the safety valve is flushed, and the rail pressure can reach dynamic balance at a certain rotating speed of the engine, at the moment, the current rotating speed of the engine is utilized to query a preset configuration file, a reference rail pressure value corresponding to the rotating speed is obtained, and the rail pressure value is utilized to continue to control the operation of the engine.
S106: and adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU so as to control the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor.
In the method provided by the embodiment of the invention, under the condition that the second rail pressure sensor is not in a fault state, the actual rail pressure value is obtained through the slave ECU, and the actual rail pressure value can be obtained through calculation of the sampling voltage value acquired by the slave ECU for the second rail pressure sensor.
The actual rail pressure value can be compared with a preset standard rail pressure value to determine a difference value between the actual rail pressure value and the standard rail pressure value, and the fuel flow of the fuel pump is adjusted based on the difference value.
Specifically, the slave ECU may periodically send the state information of the second rail pressure sensor and the actual rail pressure value to the master ECU.
The invention provides a rail pressure control method, which is applied to a main Electronic Control Unit (ECU), and comprises the following steps: acquiring rail pressure parameters sent by a first rail pressure sensor connected with the main ECU; judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters; if the first rail pressure sensor is in a fault state, judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state; and if the second rail pressure sensor is not in a fault state, adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU so as to realize the control of the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor. By applying the method provided by the embodiment of the invention, under the condition that the first rail pressure sensor is in the fault state, the actual rail pressure value can be obtained through the second rail pressure sensor which is not in the fault state, and the fuel flow of the fuel pump is adjusted according to the rail pressure value, so that the rail pressure degradation control can be avoided, and the running stability of the engine is effectively ensured.
In the method provided in the embodiment of the present invention, based on the foregoing implementation process, specifically, the determining whether the first rail pressure sensor is in an abnormal state according to the rail pressure parameter includes:
judging whether the sampling voltage value in the rail pressure parameter is larger than a preset first threshold value or not;
judging whether the sampling voltage value is smaller than a preset second threshold value, wherein the second threshold value is smaller than the first threshold value;
judging whether the state code of the analog-to-digital conversion ADC circuit in the rail pressure parameter is matched with a preset abnormal state code or not;
judging whether the difference value of the sampling voltages is larger than a preset third threshold value or not, wherein the difference value of the sampling voltages is determined according to the sampling voltage values and a prestored historical sampling voltage value;
and when any judgment result of the judgment is yes, judging that the first rail pressure sensor is in an abnormal state.
And when the judgment results of the judgment are negative, judging that the first rail pressure sensor is in a normal state.
In the method provided in the embodiment of the present invention, the first threshold, the second threshold, and the third threshold may be set in actual situations, for example, the first threshold may be 4.8v, and the second threshold may be 0.2v.
The status code of the analog-to-digital conversion ADC circuit may be obtained by a diagnostic circuit diagnosing the ADC circuit.
The historical sampling voltage value may be a sampling voltage value sampled in a previous sampling period of a current sampling period of the first rail pressure sensor under the condition that the first rail pressure sensor does not sample for the first time. Under the condition that the first rail pressure sensor samples for the first time, the historical sampling voltage value can be an initial value set by a technician, or when the first rail pressure sensor samples for the first time, the operation of judging whether the sampling voltage difference value is larger than a preset third threshold value or not can not be executed.
In the method provided by the embodiment of the invention, the first rail pressure sensor can acquire the rail pressure of the common rail pipe where the first rail pressure sensor is located according to a preset acquisition cycle to obtain an acquired voltage value, and under a normal condition, the acquired voltage value corresponds to the fuel flow of the fuel pump.
The upper limit value of the sampling voltage value can be obtained when the fuel flow of the fuel pump reaches the maximum value, and the lower limit value of the sampling voltage value can be obtained when the fuel flow of the fuel pump is zero.
It can be understood that when the main ECU receives the sampled voltage value of the first rail pressure sensor, if the sampled voltage value is greater than the upper limit value or less than the lower limit value, it may be determined that the first rail pressure sensor is in a fault state; the upper limit value may be a first threshold value and the lower limit value may be a second threshold value.
In each acquisition cycle of the first rail pressure sensor, the main ECU may further acquire, through the diagnostic circuit, whether the ADC circuit of the first rail pressure sensor samples a fault, specifically, may acquire, through the diagnostic circuit, a status code of the ADC circuit.
In the method provided in the embodiment of the present invention, based on the foregoing implementation process, specifically, after determining that the first rail pressure sensor is in the fault state, the method further includes:
and generating alarm information corresponding to the first rail pressure sensor, and displaying the alarm information.
In the method provided by the embodiment of the invention, if the sampling voltage value of the first rail pressure sensor is judged to be greater than the first threshold value, warning information of the SRC voltage overrun upper limit of the first rail pressure sensor can be generated; if the sampling voltage value of the first rail pressure sensor is judged to be smaller than the second threshold value, warning information that the SRC voltage of the first rail pressure sensor exceeds the lower limit can be generated; if the state code of the ADC circuit of the first rail pressure sensor is judged to be matched with the preset abnormal state code, warning information of ADC sampling faults of the first rail pressure sensor can be generated; if the difference value of the sampling voltage is judged to be larger than the preset third threshold value, alarm information of a fault that the gradient change of the sampling voltage value of the first rail pressure sensor is large can be generated.
Specifically, after the first rail pressure sensor is detected to be out of order, the corresponding indicator light can be controlled to flicker, the buzzer can be controlled to give an alarm, and the like.
Similarly, after determining that the second rail pressure sensor is in the fault state, warning information corresponding to the second rail pressure sensor may be generated.
In the method provided by the embodiment of the present invention, based on the implementation process, specifically, the process of adjusting the fuel flow of the fuel pump based on the actual rail pressure value, which is described in S107 in fig. 1, as shown in fig. 2, specifically includes:
s201: and comparing the actual rail pressure value with a preset standard rail pressure value, and judging whether the actual rail pressure value is consistent with the standard rail pressure value.
According to the method provided by the embodiment of the invention, the standard rail pressure value can be set according to the working condition.
S202: and if the actual rail pressure value is inconsistent with the standard rail pressure value, determining a difference value between the actual rail pressure value and the standard rail pressure value.
In the method provided by the embodiment of the invention, the difference value can be obtained by calculating the actual rail pressure value and the standard rail pressure value through various formulas; the difference value is used for representing the difference degree between the actual rail pressure value and the standard rail pressure.
For example, the difference = actual rail pressure value-standard rail pressure value;
or, the difference = standard rail pressure value-actual rail pressure value.
It should be noted that, in the case that the actual rail pressure value is consistent with the standard rail pressure value, the current fuel flow of the fuel pump is determined, so that the fuel pump maintains the fuel flow.
S203: and searching a preset relation table based on the difference value to obtain a fuel pump adjusting coefficient corresponding to the difference value.
In the method provided by the embodiment of the invention, the relation table is used for storing the corresponding relation between the difference value as the input and the fuel pump adjusting coefficient as the output.
The relationship table can store a plurality of differences and corresponding relationships between fuel pump adjustment coefficients corresponding to the differences, and the fuel pump adjustment coefficients corresponding to the differences in the relationship table can be obtained through the differences.
S204: and adjusting the fuel flow of the fuel pump by applying the fuel flow adjusting coefficient.
In the method provided by the embodiment of the invention, the current fuel flow is determined, the current fuel flow and the fuel flow adjusting system are substituted into a preset formula to obtain the target fuel flow, and the fuel pump is adjusted to enable the fuel flow of the fuel pump to be the target fuel flow.
The engine mentioned in the method provided by the embodiment of the invention can be a 12-cylinder diesel engine, a 16-cylinder diesel engine or an electric control diesel engine on a ship engine, and the like, and fuel pumps of the engines are controlled by a master ECU and a slave ECU to inject fuel.
In an embodiment of the present invention, as shown in fig. 3, in the present embodiment, the slave ECU periodically sends status information of the second rail pressure sensor to be connected to the slave ECU, and an actual rail pressure value obtained by the slave ECU calculating a rail pressure signal collected by the second rail pressure sensor to the master ECU, and the master ECU determines the status information of the first rail pressure sensor according to the rail pressure parameter sent by the second rail pressure sensor connected to the master ECU.
After the main ECU acquires the state information of the first rail pressure sensor and the state information of the second rail pressure sensor, whether the first rail pressure sensor and the second rail pressure sensor have faults or not is determined respectively; and when any one sensor has a fault, reporting the rail pressure sensor with the fault.
Summarizing the fault states of the two rail pressure sensors to determine a rail pressure control mode;
when the first rail pressure sensor and the second rail pressure sensor have faults, rail pressure degradation control is carried out, namely rail pressure is controlled in an open-loop control mode, and specifically, the engine torque limit, the engine speed limit and the rail pressure flushing valve can be enabled.
Wherein, the specific process of making the rail pressure towards the valve is: the main ECU controls the fuel pump of the engine to operate at the maximum flow rate, so that the pressure in the fuel pipeline is increased, when the pressure is increased to a certain degree, the safety valve in the fuel pipeline can be opened, after the valve is opened, the fuel pump is controlled to operate at the maximum flow rate continuously, the rail pressure reaches a dynamic balance at a certain rotating speed of the engine, a configuration file can be searched according to the current operating rotating speed by utilizing the phenomenon, so that an actual rail pressure value corresponding to the rotating speed is obtained, and the engine is controlled to operate by utilizing the rail pressure value.
When any one of the first rail pressure sensor and the second rail pressure sensor is not in a fault state, the rail pressure is controlled based on the rail pressure sensor which is not in the fault state, and the rail pressure is normally controlled, that is, the rail pressure is controlled in a closed-loop control manner.
The closed-loop control comprises the following specific processes: the main ECU compares the acquired actual rail pressure value with a preset standard rail pressure value, if the actual rail pressure value is inconsistent with the standard rail pressure value, a fuel flow adjusting coefficient can be determined through a difference value between the actual rail pressure value and the standard rail pressure value, the fuel flow of the fuel pump is adjusted according to the adjusting coefficient, and then the rail pressure in the common rail pipe can be controlled.
Optionally, when the first rail pressure sensor is not in the abnormal state, it may be determined whether the second rail pressure sensor is in the abnormal state, if the second rail pressure sensor is not in the abnormal state, the first rail pressure sensor may send the fuel flow adjustment coefficient to the slave ECU, and if the second rail pressure sensor is in the abnormal state, the second rail pressure sensor may send the actual rail pressure value obtained by the first rail pressure sensor and the fuel flow adjustment coefficient to the slave ECU.
When the first rail pressure sensor is in an abnormal state, whether the second rail pressure sensor is in the abnormal state or not can be determined, if the second rail pressure sensor is not in the abnormal state, the current fuel flow adjusting coefficient is determined according to the actual rail pressure value sent by the second rail pressure sensor, and the fuel flow adjusting coefficient is sent to the slave ECU.
Optionally, the slave ECU may control the fuel injection amount and/or the fuel injection opening of the fuel pump according to the adjustment coefficient, and the master ECU may also adjust the fuel injection opening and/or the fuel injection amount of the fuel pump by using the fuel flow adjustment coefficient, and may specifically set the fuel injection amount according to actual requirements.
Corresponding to the method shown in fig. 1, an embodiment of the present invention further provides a rail pressure control device, which is used for implementing the method shown in fig. 1 specifically, and the rail pressure control device provided in the embodiment of the present invention may be applied to a main electronic control unit ECU, and a schematic structural diagram of the rail pressure control device is shown in fig. 4, and specifically includes:
a first obtaining unit 401, configured to obtain a rail pressure parameter sent by a first rail pressure sensor connected to the main ECU;
a first determining unit 402, configured to determine whether the first rail pressure sensor is in a fault state according to the rail pressure parameter;
a second determination unit 403, configured to determine whether a second rail pressure sensor connected to a preset slave ECU is in a failure state when the first rail pressure sensor is in the failure state;
and an adjusting unit 404, configured to adjust a fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU when the second rail pressure sensor is not in a fault state, so as to control the rail pressure in a closed-loop control mode, where the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor.
The embodiment of the invention provides a rail pressure control device, which is applied to a main Electronic Control Unit (ECU) and used for acquiring rail pressure parameters sent by a first rail pressure sensor connected with the main ECU; judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters; if the first rail pressure sensor is in a fault state, judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state; and if the second rail pressure sensor is not in a fault state, adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU so as to control the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor. By applying the device provided by the embodiment of the invention, under the condition that the first rail pressure sensor is in the fault state, the actual rail pressure value can be obtained through the second rail pressure sensor which is not in the fault state, and the fuel flow of the fuel pump is adjusted according to the rail pressure value, so that the rail pressure degradation control can be avoided, and the running stability of the engine is effectively ensured.
In an embodiment of the present invention, based on the above scheme, specifically, the first determining unit 402 includes:
the first judgment subunit is used for judging whether the sampling voltage value in the rail pressure parameter is greater than a preset first threshold value or not;
the second judgment subunit is configured to judge whether the sampling voltage value is smaller than a preset second threshold, where the second threshold is smaller than the first threshold;
the third judging subunit is used for judging whether the state code of the analog-to-digital conversion ADC circuit in the rail pressure parameter is matched with a preset abnormal state code;
the fourth judgment subunit is configured to judge whether a sampling voltage difference value is greater than a preset third threshold, where the sampling voltage difference value is determined according to the sampling voltage value and a prestored historical sampling voltage value;
and the judging unit is used for judging that the first rail pressure sensor is in an abnormal state when any judgment result of the judgment is yes.
In an embodiment of the present invention, based on the above scheme, specifically, the rail pressure control apparatus further includes:
and the generating unit is used for generating alarm information corresponding to the first rail pressure sensor and displaying the alarm information.
In an embodiment provided by the present invention, based on the above scheme, optionally, the rail pressure control device further includes:
and the control unit is used for enabling the fuel flow of the fuel pump to be at the maximum value when the second rail pressure sensor is in an abnormal state so as to realize the control of the rail pressure in an open-loop mode.
In an embodiment of the invention, based on the above scheme, specifically, the adjusting unit 404 includes:
a fifth judging subunit, configured to compare the actual rail pressure value with a preset standard rail pressure value, and judge whether the actual rail pressure value is consistent with the standard rail pressure value;
a determination subunit, configured to determine, when the actual rail pressure value is inconsistent with the standard rail pressure value, a difference between the actual rail pressure value and the standard rail pressure value;
the searching subunit is used for searching a preset relation table based on the difference value so as to obtain a fuel flow adjusting coefficient corresponding to the difference value;
and the adjusting subunit is used for adjusting the fuel flow of the fuel pump by applying the fuel flow adjusting coefficient.
The specific principle and the implementation process of each unit and module in the rail pressure control device disclosed in the embodiment of the present invention are the same as those of the rail pressure control method disclosed in the embodiment of the present invention, and reference may be made to corresponding parts in the rail pressure control method provided in the embodiment of the present invention, which are not described herein again.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in one or more of software and/or hardware in implementing the invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The rail pressure control method provided by the invention is described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A rail pressure control method, applied to a master ECU, the method comprising:
acquiring rail pressure parameters of a first rail pressure sensor connected with the main ECU; the rail voltage parameters comprise sampling voltage values and state parameters of an analog-to-digital conversion ADC circuit;
judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters;
if the first rail pressure sensor is in a fault state, judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state; when the first rail pressure sensor is not in a fault state, the actual voltage value corresponding to the first rail pressure sensor is applied to adjust the fuel flow of the fuel pump so as to control the rail pressure in a closed-loop control mode;
if the second rail pressure sensor is not in a fault state, adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU so as to control the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor;
and if the second rail pressure sensor is in a fault state, enabling the fuel flow of the fuel pump to be at the maximum value so as to realize the control of the rail pressure in an open loop mode.
2. The method of claim 1, wherein said determining whether the first rail pressure sensor is in a fault state based on the rail pressure parameter comprises:
judging whether the sampling voltage value in the rail pressure parameter is larger than a preset first threshold value or not;
judging whether the sampling voltage value is smaller than a preset second threshold value or not, wherein the second threshold value is smaller than the first threshold value;
judging whether the state code of the analog-to-digital conversion ADC circuit in the rail pressure parameter is matched with a preset fault state code or not;
judging whether the difference value of the sampling voltages is larger than a preset third threshold value or not, wherein the difference value of the sampling voltages is determined according to the sampling voltage values and a prestored historical sampling voltage value;
and when any judgment result of the judgment is yes, judging that the first rail pressure sensor is in a fault state.
3. The method of claim 1, after determining that the first rail pressure sensor is in a fault state, further comprising:
and generating alarm information corresponding to the first rail pressure sensor, and displaying the alarm information.
4. The method of claim 1, wherein said adjusting fuel flow to a fuel pump based on said actual rail pressure value sent from an ECU comprises:
comparing the actual rail pressure value with a preset standard rail pressure value, and judging whether the actual rail pressure value is consistent with the standard rail pressure value;
if the rail pressure values are inconsistent, determining a difference value between the actual rail pressure value and the standard rail pressure value;
searching a preset relation table based on the difference value to obtain a fuel flow adjusting coefficient corresponding to the difference value;
and adjusting the fuel flow of the fuel pump by applying the fuel flow adjusting coefficient.
5. A rail pressure control apparatus, applied to a main ECU, the apparatus comprising:
the first acquisition unit is used for acquiring rail pressure parameters sent by a first rail pressure sensor connected with the main ECU; the rail voltage parameters comprise a sampling voltage value and state parameters of an analog-to-digital conversion ADC circuit;
the first judging unit is used for judging whether the first rail pressure sensor is in a fault state or not according to the rail pressure parameters;
the second judgment unit is used for judging whether a second rail pressure sensor connected with a preset slave ECU is in a fault state or not when the first rail pressure sensor is in the fault state; when the first rail pressure sensor is not in a fault state, the actual voltage value corresponding to the first rail pressure sensor is applied to adjust the fuel flow of the fuel pump so as to control the rail pressure in a closed-loop control mode;
the adjusting unit is used for adjusting the fuel flow of the fuel pump based on the actual rail pressure value sent by the slave ECU when the second rail pressure sensor is not in a fault state so as to control the rail pressure in a closed-loop control mode, wherein the actual rail pressure value is acquired by the slave ECU according to the second rail pressure sensor;
and the control unit is used for enabling the fuel flow of the fuel pump to be at the maximum value when the second rail pressure sensor is in a fault state so as to realize the control of the rail pressure in an open loop mode.
6. The apparatus according to claim 5, wherein the first determining unit comprises:
the first judgment subunit is used for judging whether the sampling voltage value in the rail pressure parameter is greater than a preset first threshold value or not;
the second judging subunit is configured to judge whether the sampling voltage value is smaller than a preset second threshold, where the second threshold is smaller than the first threshold;
the third judging subunit is used for judging whether the state code of the analog-to-digital conversion ADC circuit in the rail pressure parameter is matched with a preset fault state code;
the fourth judgment subunit is configured to judge whether a sampling voltage difference value is greater than a preset third threshold, where the sampling voltage difference value is determined according to the sampling voltage value and a prestored historical sampling voltage value;
and the judging unit is used for judging that the first rail pressure sensor is in a fault state when any judgment result of the judgment is yes.
7. The apparatus of claim 5, further comprising:
and the generating unit is used for generating alarm information corresponding to the first rail pressure sensor and displaying the alarm information.
8. The apparatus of claim 5, wherein the adjusting unit comprises:
a fifth judging subunit, configured to compare the actual rail pressure value with a preset standard rail pressure value, and judge whether the actual rail pressure value is consistent with the standard rail pressure value;
a determination subunit, configured to determine, when the actual rail pressure value is inconsistent with the standard rail pressure value, a difference between the actual rail pressure value and the standard rail pressure value;
the searching subunit is used for searching a preset relation table based on the difference value so as to obtain a fuel flow adjusting coefficient corresponding to the difference value;
and the adjusting subunit is used for adjusting the fuel flow of the fuel pump by applying the fuel flow adjusting coefficient.
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| CN202010229691.8A CN111365138B (en) | 2020-03-27 | 2020-03-27 | Rail pressure control method and device |
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| CN202010229691.8A CN111365138B (en) | 2020-03-27 | 2020-03-27 | Rail pressure control method and device |
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| CN114151219A (en) * | 2021-11-26 | 2022-03-08 | 重庆红江机械有限责任公司 | Double-closed-loop PID rail pressure control method and system, common rail diesel engine and storage medium |
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