CN112211693A - Engine electric control variable displacement engine oil pump control method and control device - Google Patents
Engine electric control variable displacement engine oil pump control method and control device Download PDFInfo
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- CN112211693A CN112211693A CN201910616992.3A CN201910616992A CN112211693A CN 112211693 A CN112211693 A CN 112211693A CN 201910616992 A CN201910616992 A CN 201910616992A CN 112211693 A CN112211693 A CN 112211693A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/02—Pressure lubrication using lubricating pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/16—Controlling lubricant pressure or quantity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/18—Indicating or safety devices
- F01M1/20—Indicating or safety devices concerning lubricant pressure
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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
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
A control method of an engine electric control variable displacement oil pump comprises the steps of collecting or calculating the rotating speed, the load, the water temperature and the altitude of an engine at a set frequency; comparing the current water temperature with the set water temperature and the current altitude with the set altitude; determining the working mode of the variable displacement engine oil pump and the output duty ratio of the ECU according to the relationship between the current water temperature and the set water temperature and the relationship between the current altitude and the set altitude; outputting a proper duty ratio signal to an oil pump electromagnetic valve to control the oil pump to output oil pressure change; and reading the current oil pressure after the set time, determining a target oil pressure according to the current rotating speed, the current load, the current water temperature and the current altitude, outputting a proper duty ratio signal to an oil pump electromagnetic valve according to the difference value of the current oil pressure and the target oil pressure, and controlling the output oil pressure of the oil pump in a closed loop mode until the output oil pressure is modulated to the target oil pressure. The invention also provides an engine electric control variable displacement engine oil pump control device.
Description
Technical Field
The invention relates to the technology of automobile engines, in particular to a control method and a control device for an engine electric control variable displacement oil pump.
Background
Fuel economy is an important index for evaluating the advancement of engine technology. In the prior engine, engine oil is increased to a certain pressure by using an oil pump and then is forcibly pressed onto the moving surfaces of various parts of the engine so as to reduce the friction in the running process of the engine and reduce the oil consumption of the engine, and the method is a common method for improving the fuel economy of the engine.
Most of oil pumps adopted by an engine at present are a constant-displacement pump and a two-stage variable pump, and the two oil pumps either have invariable displacement or limited displacement variable range, so that when the engine works, on one hand, the oil pressure is far higher than the lubrication requirement of the engine, and on the other hand, a large amount of oil flows back to an oil pan from an oil pump pressure release valve because the oil pump does not participate in lubrication, namely, the two oil pumps have the problems of excessive oil pump capacity and high oil consumption.
The industry also has an electrically-controlled fully-variable oil pump at present, and the oil pump can automatically adjust the output oil pressure of the oil pump according to the oil pressure requirement of an engine during working, so that the problems of excessive capacity and high oil consumption of the oil pump are solved. However, the oil pump simply opens the oil pressure according to the rotating speed, the load and the oil temperature, the control mode is simple and rough, the oil pressure cannot be controlled quickly and accurately, the oil pump has large design margin of the rotating displacement, large friction work and poor energy-saving effect, and an oil temperature sensor is required to be added to the oil pump, so that the cost is high; in addition, the altitude is not considered in the control strategy of the engine oil pump, and the supercharger has failure risk in a high-altitude area; under the extremely low temperature environment, the oil pump is relatively slow in pressure build-up in the low pressure mode due to the fact that the oil pressure cannot be accurately controlled.
The foregoing description is provided for general background information and is not admitted to be prior art.
Disclosure of Invention
In view of this, the invention provides a control method and a control device for an engine electric control variable displacement oil pump, which can quickly and accurately adjust the oil pressure according to the oil pressure requirement of the oil pump and reduce the oil consumption.
The invention provides a method for controlling an engine electric control variable displacement oil pump, which comprises the following steps: collecting or calculating the rotating speed, load, water temperature and altitude of the engine at a set frequency; comparing the current water temperature with the set water temperature and the current altitude with the set altitude; determining the working mode of the variable displacement engine oil pump and the output duty ratio of the ECU according to the relationship between the current water temperature and the set water temperature and the relationship between the current altitude and the set altitude; outputting a proper duty ratio signal to an oil pump electromagnetic valve to control the oil pump to output oil pressure change; and reading the current oil pressure after the set time, determining a target oil pressure according to the current rotating speed, the current load, the current water temperature and the current altitude, outputting a proper duty ratio signal to an oil pump electromagnetic valve according to the difference value of the current oil pressure and the target oil pressure, and controlling the output oil pressure of the oil pump in a closed loop mode until the output oil pressure is modulated to the target oil pressure.
Further, the step of collecting or calculating the engine speed, load, water temperature and altitude at a set frequency further comprises: establishing a corresponding relation table of the engine speed, the load, the water temperature and the altitude, the duty ratio of an electromagnetic valve of the oil pump and the oil pressure; and pre-storing the corresponding relation table into the ECU.
Further, the step of collecting or calculating the engine speed, load, water temperature and altitude at a set frequency further comprises: the whole vehicle is electrified, and the ECU receives signals of a rotating speed sensor, a water temperature sensor, an altitude sensor and an engine oil pressure sensor; judging whether the corresponding sensor has a fault according to the received rotating speed, water temperature, altitude and oil pressure signals; if any sensor fails, the ECU sends an alarm to prompt that the fault exists, the duty ratio of an electromagnetic valve of the oil pump is adjusted to 0, and the oil pump is controlled to operate in the highest oil pressure mode; if the four sensors have no fault, the ECU acquires the current water temperature and the altitude at a set frequency.
Further, according to the relationship between the current water temperature and the set water temperature and the relationship between the current altitude and the set altitude, the working mode and the output duty ratio of the variable displacement oil pump are determined as follows: if the current water temperature T is less than or equal to the set water temperature T0 or the current altitude H is more than or equal to the set altitude H1, the ECU outputs a duty ratio of zero, and the variable oil pump is controlled to work in a maximum rotary displacement mode; if the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the ECU further determines the output duty cycle and the working mode of the variable displacement oil pump according to the engine speed and the load.
Further, if the water temperature T > is the set water temperature T0 and the altitude H < the set altitude H1, the ECU further determines the duty cycle of the output and the operation mode of the variable displacement oil pump according to the engine speed and the load, including: if the engine speed n is less than a first set speed n0 and the engine load BMEP is less than a first set load BMEP0, the ECU determines that the variable displacement oil pump works in a low-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude; if the second set rotating speed n1 is not less than the engine rotating speed n not less than the first set rotating speed n0, and the second set load BMEP1 is not less than the engine load BMEP not less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a medium-pressure mode, and determines the output duty ratio by looking up a table according to the engine rotating speed, the load, the water temperature and the altitude; if the engine speed n is greater than or equal to a second set speed n1 and the engine load BMEP is greater than or equal to a second set load BMEP1, the ECU determines that the variable displacement oil pump works in a high-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude.
Further, the first set rotating speed n0, the second set rotating speed n1, the first set load BMEP0 and the second set load BMEP1 are obtained by pre-calibration, and the engine load is calculated according to the fuel injection quantity, the duty ratio and the ignition advance angle.
The invention provides an engine electric control variable displacement engine oil pump control device, comprising: the rotating speed sensor is used for acquiring the rotating speed of the engine; the water temperature sensor is used for collecting the water temperature of the engine; the altitude sensor is used for acquiring the altitude of the engine; the engine oil pressure sensor is used for collecting the engine oil pressure of the engine oil pump; an ECU which is in signal connection with the rotation speed sensor, the water temperature sensor and the altitude sensor and is used for receiving signals of the rotation speed sensor, the water temperature sensor and the altitude sensor, wherein the ECU is internally provided with a corresponding relation table of engine rotation speed, load, water temperature and altitude, duty ratio of an electromagnetic valve of the oil pump and oil pressure, and is used for determining a working mode of the variable displacement oil pump according to the relation between the current water temperature and the set water temperature as well as the current altitude and the set altitude, outputting a proper duty ratio signal to the electromagnetic valve of the oil pump to control the change of the oil pressure of the oil pump, reading the current oil pressure after the set time, determining the target oil pressure according to the current rotation speed, the current load, the current water temperature and the current altitude, outputting a proper duty ratio signal to the electromagnetic valve of the oil pump according to, until the output oil pressure is adjusted to the target oil pressure.
Furthermore, the ECU receives signals of the rotating speed sensor, the water temperature sensor, the altitude sensor and the engine oil pressure sensor after the whole vehicle is electrified, and judges whether the corresponding sensor has a fault according to the received signals of the rotating speed, the water temperature, the altitude and the oil pressure; if any sensor fails, the ECU sends an alarm to prompt that the fault exists, the duty ratio of an electromagnetic valve of the oil pump is adjusted to 0, and the oil pump is controlled to operate in the highest oil pressure mode; if the four sensors have no fault, the ECU acquires the current water temperature and the current altitude at a set frequency.
Further, when the ECU determines the operation mode of the variable displacement oil pump according to the relationship between the current water temperature and the set water temperature, and the current altitude and the set altitude, and outputs an appropriate duty ratio signal:
if the current water temperature T is less than or equal to the set water temperature T0 or the current altitude H is greater than or equal to the set altitude H1, the duty ratio output by the ECU is zero, and the variable oil pump works in a maximum rotary displacement mode;
if the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the ECU further determines the output duty cycle and the operating mode of the variable displacement oil pump according to the engine speed and the load.
Further, if the water temperature T > set water temperature T0 and the altitude H < set altitude H1, the ECU further determines an output duty cycle and an operation mode of the variable displacement oil pump according to the engine speed and the load, including: if the engine speed n is less than the first set speed n0 and the engine load BMEP is less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a low-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude; if the second set rotating speed n1 is not less than the engine rotating speed n not less than the first set rotating speed n0, and the second set load BMEP1 is not less than the engine load BMEP not less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a medium-pressure mode, and determines the output duty ratio by looking up a table according to the engine rotating speed, the load, the water temperature and the altitude; and if the engine speed n is greater than or equal to a second set speed n1 and the engine load BMEP is greater than or equal to a second set load BMEP1, the ECU determines that the variable displacement oil pump works in a high-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude.
The invention has at least one of the following beneficial effects:
1. the control logic of the invention firstly coarsely adjusts the oil pressure and then finely adjusts the oil pressure, and the multi-stage adjustment of the oil pressure can be realized more quickly by utilizing the control mode of combining the coarse adjustment and the fine adjustment;
2. according to the invention, the ECU can look up a table according to the water temperature, the engine speed and the load, find the corresponding duty ratio of the electromagnetic valve of the oil pump, control the output pressure of the oil and roughly adjust the oil pressure, and the oil temperature is not used as a control parameter, so that the installation of an oil temperature sensor is avoided, and the cost is reduced;
3. when oil pressure is switched, the ECU can feed back and finely adjust the oil pressure in a closed loop according to signals of an oil pressure sensor, so that the oil pressure is more accurately adjusted, the design allowance of the oil pump displacement is reduced, the friction work is reduced, and the oil consumption is reduced; the multistage oil pressure regulation can be realized more quickly and accurately;
4. altitude factors are considered in the oil pressure control logic, so that failure of a supercharger caused by a low-pressure mode of an oil pump is avoided;
5. the oil pressure control logic of the invention considers the extremely low temperature environment factor, and works in the maximum rotary displacement mode under the extremely low temperature environment, thereby improving the pressure building speed and avoiding the damage of parts caused by insufficient lubrication.
Drawings
FIG. 1 is a schematic structural diagram of an engine electric control variable displacement oil pump control method of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
First embodiment
As shown in fig. 1, a method for controlling an engine electrically-controlled variable displacement oil pump according to an embodiment of the present invention includes:
step S10: establishing a corresponding relation table of the engine speed, the load, the water temperature and the altitude, the duty ratio of an electromagnetic valve of the oil pump and the oil pressure;
it should be noted that step S10 is performed in an engine calibration test stage, in which the correspondence table is established according to the rotation speed, load, water temperature, and altitude of the engine under different working conditions, and the corresponding duty ratio of the electromagnetic valve of the oil pump and the oil pressure of the oil pump.
Step S20: prestoring the corresponding relation table into an ECU (electronic control unit);
step S30: after the whole vehicle is electrified, the ECU receives signals of a rotating speed sensor, a water temperature sensor, an altitude sensor and an engine oil pressure sensor;
step S40: the ECU judges whether the corresponding sensors have faults or not according to the received rotating speed, water temperature, altitude and oil pressure signals, if any one of the sensors has faults, an alarm is sent out to prompt a user that the corresponding sensor has faults, meanwhile, the ECU controls the duty ratio of an electromagnetic valve of the oil pump to be adjusted to 0, and the oil pump runs in the highest oil pressure mode; if the four sensors have no fault, the ECU acquires the rotating speed, the water temperature, the altitude and the oil pressure of the engine at a set frequency, and calculates the load of the engine according to the received signals of the fuel injection quantity, the duty ratio, the ignition advance angle and the like at the set frequency;
in step S40, when the ECU collects or calculates the engine speed, the water temperature, the altitude, the oil pressure, and the load at the set frequencies, the collection or calculation may be performed at different frequencies, for example, the engine speed may be collected at the first frequency f1, the water temperature may be collected at the second frequency f2, the altitude signal may be collected at the third frequency f3, the oil pressure may be collected at the fourth frequency f4, and the engine load may be calculated at the fifth frequency f5, which may be equal or different.
Step S50: the ECU compares the current water temperature T with the set water temperature T0, and the current altitude H with the set altitude H1;
in step S50, the water temperature T0 is set to be less than or equal to-20 ℃, and the altitude H1 is set to be greater than or equal to 2000 m.
Step S60: the ECU determines the working mode and the output duty ratio of the variable displacement oil pump according to the relationship between the current water temperature T and the set water temperature T0 and the relationship between the current altitude H and the set altitude H1;
in step S60, if the current water temperature T is less than or equal to the set water temperature T0 or the current altitude H is greater than or equal to the set altitude H1, the ECU outputs a duty ratio of zero, and controls the variable-displacement oil pump to operate in the maximum rotary displacement mode.
If the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the ECU further determines the output duty ratio and the working mode of the variable displacement oil pump according to the engine speed and the load, and the specific steps are as follows:
if the engine speed n is less than a first set speed n0 and the engine load BMEP is less than a first set load BMEP0, the ECU determines that the variable displacement oil pump works in a low-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude;
if the second set rotating speed n1 is not less than the engine rotating speed n not less than the first set rotating speed n0, and the second set load BMEP1 is not less than the engine load BMEP not less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a medium-pressure mode, and determines the output duty ratio by looking up a table according to the engine rotating speed, the load, the water temperature and the altitude;
if the engine speed n is greater than or equal to a second set speed n1 and the engine load BMEP is greater than or equal to a second set load BMEP1, the ECU determines that the variable displacement oil pump works in a high-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude.
In step S60, the first set speed n0, the second set speed n1, the first set load BMEP0, and the second set load BMEP1 are calibrated in an engine calibration test according to the lubrication and/or cooling requirements of the elements such as the crankshaft, the piston, the hydraulic tensioner, and the oil cooler.
In step S60, if the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the variable displacement oil pump has three different operation modes, it is understood that in other embodiments of the present invention, the variable displacement oil pump may be divided into more operation modes according to the requirement to realize more stages or even stepless oil pressure adjustment.
Step S70: the ECU outputs a proper duty ratio signal to the electromagnetic valve of the oil pump according to the table look-up result, and controls the oil pump to output oil pressure change;
step S80: the ECU reads the current oil pressure after the set time (for example, 300ms), determines the target oil pressure according to the current rotating speed, the current load, the current water temperature and the current altitude look-up table, outputs a proper duty ratio signal to the electromagnetic valve of the oil pump according to the difference value of the current oil pressure and the target oil pressure, and controls the output oil pressure of the oil pump in a closed-loop manner until the output oil pressure is modulated to the target oil pressure, so that the variable displacement oil pump operates according to the working mode determined by the ECU.
Second embodiment
The invention also provides a control device of the engine electric control variable displacement engine oil pump, which comprises a rotating speed sensor, a water temperature sensor, an altitude sensor, an engine oil pressure sensor and an ECU.
Wherein, the rotational speed sensor is used for gathering the engine speed. The water temperature sensor is used for collecting the water temperature of the engine. The altitude sensor is used for acquiring the altitude of the engine. The engine oil pressure sensor is used for collecting the engine oil pressure of the engine oil pump. And the ECU is in signal connection with the rotating speed sensor, the water temperature sensor, the altitude sensor and the engine oil pressure sensor and is used for receiving signals of the rotating speed sensor, the water temperature sensor, the altitude sensor and the engine oil pressure sensor.
The ECU is internally provided with a corresponding relation table of engine speed, load, water temperature and altitude, the duty ratio of an electromagnetic valve of the oil pump and oil pressure, and is used for determining the working mode of the variable displacement oil pump according to the relation between the current water temperature T and the set water temperature T0 and the relation between the current altitude H and the set altitude H1, outputting a proper duty ratio signal to the electromagnetic valve of the oil pump and controlling the change of oil pressure output by the oil pump.
And the ECU also reads the current oil pressure after the set time, determines the target oil pressure according to the current rotating speed, the current load, the current water temperature and the current altitude, outputs a proper duty ratio signal to the electromagnetic valve of the oil pump according to the difference value of the current oil pressure and the target oil pressure, and controls the output oil pressure of the oil pump in a closed loop mode until the output oil pressure is modulated to the target oil pressure.
The ECU also receives signals of a rotating speed sensor, a water temperature sensor, an altitude sensor and an engine oil pressure sensor after the whole vehicle is electrified, and judges whether the corresponding sensor has a fault according to the received rotating speed, water temperature, altitude and oil pressure signals; if any sensor fails, the ECU sends an alarm to prompt that the fault exists, the duty ratio of an electromagnetic valve of the oil pump is adjusted to 0, and the oil pump is controlled to operate in the highest oil pressure mode; if the four sensors have no fault, the ECU acquires the rotating speed, the water temperature, the altitude and the oil pressure of the engine at a set frequency, and calculates the load of the engine according to the received signals of the fuel injection quantity, the duty ratio, the ignition advance angle and the like at the set frequency.
Further, when the ECU determines the working mode of the variable displacement oil pump according to the relationship between the current water temperature T and the set water temperature T0 and the relationship between the current altitude H and the set altitude H1 and outputs a proper duty ratio signal, if the current water temperature T is less than or equal to the set water temperature T0 or the current altitude H is more than or equal to the set altitude H1, the duty ratio output by the ECU is zero, and the variable displacement oil pump works in the maximum rotary displacement mode; if the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the ECU further determines the output duty cycle and the working mode of the variable displacement oil pump according to the engine speed and the load, specifically:
if the engine speed n is less than a first set speed n0 and the engine load BMEP is less than a first set load BMEP0, the ECU determines that the variable displacement oil pump works in a low-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude;
if the second set rotating speed n1 is not less than the engine rotating speed n not less than the first set rotating speed n0, and the second set load BMEP1 is not less than the engine load BMEP not less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a medium-pressure mode, and determines the output duty ratio by looking up a table according to the engine rotating speed, the load, the water temperature and the altitude;
if the engine speed n is greater than or equal to a second set speed n1 and the engine load BMEP is greater than or equal to a second set load BMEP1, the ECU determines that the variable displacement oil pump works in a high-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude.
In the present embodiment, if the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the variable displacement oil pump has three different operation modes, it can be understood that in other embodiments of the present invention, the variable displacement oil pump can be divided into more operation modes according to the requirement, so as to realize more stages or even stepless oil pressure adjustment.
In summary, the present invention has at least one of the following advantages:
1. the control logic of the invention firstly coarsely adjusts the oil pressure and then finely adjusts the oil pressure, and the multi-stage adjustment of the oil pressure can be realized more quickly by utilizing the control mode of combining the coarse adjustment and the fine adjustment;
2. according to the invention, the ECU can look up a table according to the water temperature, the engine speed and the load, find the corresponding duty ratio of the electromagnetic valve of the oil pump, control the output pressure of the oil and roughly adjust the oil pressure, and the oil temperature is not used as a control parameter, so that the installation of an oil temperature sensor is avoided, and the cost is reduced;
3. when oil pressure is switched, the ECU can feed back and finely adjust the oil pressure in a closed loop according to signals of an oil pressure sensor, so that the oil pressure is more accurately adjusted, the design allowance of the oil pump displacement is reduced, the friction work is reduced, and the oil consumption is reduced; the multistage oil pressure regulation can be realized more quickly and accurately;
4. altitude factors are considered in the oil pressure control logic, so that failure of a supercharger caused by a low-pressure mode of an oil pump is avoided;
5. the oil pressure control logic of the invention considers the extremely low temperature environment factor, and works in the maximum rotary displacement mode under the extremely low temperature environment, thereby improving the pressure building speed and avoiding the damage of parts caused by insufficient lubrication.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An engine electric control variable displacement oil pump control method is characterized by comprising the following steps:
collecting or calculating the rotating speed, load, water temperature and altitude of the engine at a set frequency;
comparing the current water temperature with the set water temperature and the current altitude with the set altitude;
determining the working mode of the variable displacement engine oil pump and the output duty ratio of the ECU according to the relationship between the current water temperature and the set water temperature and the relationship between the current altitude and the set altitude;
outputting a proper duty ratio signal to an oil pump electromagnetic valve to control the oil pump to output oil pressure change;
and reading the current oil pressure after the set time, determining a target oil pressure according to the current rotating speed, the current load, the current water temperature and the current altitude, outputting a proper duty ratio signal to an oil pump electromagnetic valve according to the difference value of the current oil pressure and the target oil pressure, and controlling the output oil pressure of the oil pump in a closed loop mode until the output oil pressure is modulated to the target oil pressure.
2. The method of controlling an electronically controlled variable displacement oil pump of an engine of claim 1, wherein the step of collecting or calculating engine speed, load, water temperature and altitude at a set frequency further comprises, prior to the step of:
establishing a corresponding relation table of the engine speed, the load, the water temperature and the altitude, the duty ratio of an electromagnetic valve of the oil pump and the oil pressure;
and pre-storing the corresponding relation table into the ECU.
3. The method of controlling an electronically controlled variable displacement oil pump of an engine of claim 2, wherein the step of collecting or calculating engine speed, load, water temperature and altitude at a set frequency further comprises, prior to the step of:
the whole vehicle is electrified, and the ECU receives signals of a rotating speed sensor, a water temperature sensor, an altitude sensor and an engine oil pressure sensor;
judging whether the corresponding sensor has a fault according to the received rotating speed, water temperature, altitude and oil pressure signals;
if any sensor fails, the ECU sends an alarm to prompt that the fault exists, the duty ratio of an electromagnetic valve of the oil pump is adjusted to 0, and the oil pump is controlled to operate in the highest oil pressure mode;
if the four sensors have no fault, the ECU acquires the current water temperature and the altitude at a set frequency.
4. The method for controlling the electric-controlled variable-displacement oil pump of the engine as claimed in claim 3, wherein in the step of determining the working mode and the output duty ratio of the variable-displacement oil pump according to the relationship between the current water temperature and the set water temperature and the relationship between the current altitude and the set altitude:
if the current water temperature T is less than or equal to the set water temperature T0 or the current altitude H is more than or equal to the set altitude H1, the ECU outputs a duty ratio of zero, and the variable oil pump is controlled to work in a maximum rotary displacement mode;
if the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the ECU further determines the output duty cycle and the working mode of the variable displacement oil pump according to the engine speed and the load.
5. The method of claim 4, wherein if the water temperature T > set water temperature T0 and the altitude H < set altitude H1, the ECU further determines the duty cycle of the output and the operating mode of the variable displacement oil pump based on the engine speed and load, comprising:
if the engine speed n is less than a first set speed n0 and the engine load BMEP is less than a first set load BMEP0, the ECU determines that the variable displacement oil pump works in a low-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude;
if the second set rotating speed n1 is not less than the engine rotating speed n not less than the first set rotating speed n0, and the second set load BMEP1 is not less than the engine load BMEP not less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a medium-pressure mode, and determines the output duty ratio by looking up a table according to the engine rotating speed, the load, the water temperature and the altitude;
if the engine speed n is greater than or equal to a second set speed n1 and the engine load BMEP is greater than or equal to a second set load BMEP1, the ECU determines that the variable displacement oil pump works in a high-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude.
6. The method of controlling an electrically controlled variable displacement oil pump of an engine according to claim 5, characterized in that the first set speed n0, the second set speed n1, the first set load BMEP0 and the second set load BMEP1 are pre-calibrated, and the engine load is calculated from the amount of fuel injected, the duty cycle and the angle of ignition advance.
7. An electrically controlled variable displacement engine oil pump control device for an engine, comprising:
the rotating speed sensor is used for acquiring the rotating speed of the engine;
the water temperature sensor is used for collecting the water temperature of the engine;
the altitude sensor is used for acquiring the altitude of the engine;
the engine oil pressure sensor is used for collecting the engine oil pressure of the engine oil pump;
an ECU which is in signal connection with the rotation speed sensor, the water temperature sensor and the altitude sensor and is used for receiving signals of the rotation speed sensor, the water temperature sensor and the altitude sensor, wherein the ECU is internally provided with a corresponding relation table of engine rotation speed, load, water temperature and altitude, duty ratio of an electromagnetic valve of the oil pump and oil pressure, and is used for determining a working mode of the variable displacement oil pump according to the relation between the current water temperature and the set water temperature as well as the current altitude and the set altitude, outputting a proper duty ratio signal to the electromagnetic valve of the oil pump to control the change of the oil pressure of the oil pump, reading the current oil pressure after the set time, determining the target oil pressure according to the current rotation speed, the current load, the current water temperature and the current altitude, outputting a proper duty ratio signal to the electromagnetic valve of the oil pump according to, until the output oil pressure is adjusted to the target oil pressure.
8. The electrically controlled variable displacement engine oil pump control device of claim 7, wherein said ECU further receives signals from said speed sensor, water temperature sensor, altitude sensor and oil pressure sensor after the vehicle is powered on, and determines whether the corresponding sensor is malfunctioning based on the received signals of speed, water temperature, altitude and oil pressure; if any sensor fails, the ECU sends an alarm to prompt that the fault exists, the duty ratio of an electromagnetic valve of the oil pump is adjusted to 0, and the oil pump is controlled to operate in the highest oil pressure mode; if the four sensors have no fault, the ECU acquires the current water temperature and the current altitude at a set frequency.
9. An electrically controlled variable displacement oil pump control device for an engine as claimed in claim 7, wherein when said ECU determines the operation mode of the variable displacement oil pump based on the relationship between the current water temperature and the set water temperature and the relationship between the current altitude and the set altitude, and outputs the appropriate duty ratio signal:
if the current water temperature T is less than or equal to the set water temperature T0 or the current altitude H is greater than or equal to the set altitude H1, the duty ratio output by the ECU is zero, and the variable oil pump works in a maximum rotary displacement mode;
if the current water temperature T > is the set water temperature T0 and the current altitude H < the set altitude H1, the ECU further determines the output duty cycle and the operating mode of the variable displacement oil pump according to the engine speed and the load.
10. The electronically controlled variable displacement oil pump control device of an engine as recited in claim 9 wherein if the water temperature T > set water temperature T0 and the altitude H < set altitude H1, said ECU further determines the output duty cycle and the operating mode of the variable displacement oil pump based upon engine speed and load, comprising:
if the engine speed n is less than the first set speed n0 and the engine load BMEP is less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a low-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude;
if the second set rotating speed n1 is not less than the engine rotating speed n not less than the first set rotating speed n0, and the second set load BMEP1 is not less than the engine load BMEP not less than the first set load BMEP0, the ECU determines that the variable displacement oil pump works in a medium-pressure mode, and determines the output duty ratio by looking up a table according to the engine rotating speed, the load, the water temperature and the altitude;
and if the engine speed n is greater than or equal to a second set speed n1 and the engine load BMEP is greater than or equal to a second set load BMEP1, the ECU determines that the variable displacement oil pump works in a high-pressure mode, and determines the output duty ratio by looking up a table according to the engine speed, the load, the water temperature and the altitude.
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