CN115234381B - Rail pressure control method and control system for variable valve of engine - Google Patents
Rail pressure control method and control system for variable valve of engine Download PDFInfo
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- CN115234381B CN115234381B CN202210902476.9A CN202210902476A CN115234381B CN 115234381 B CN115234381 B CN 115234381B CN 202210902476 A CN202210902476 A CN 202210902476A CN 115234381 B CN115234381 B CN 115234381B
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- 239000010705 motor oil Substances 0.000 claims abstract description 336
- 239000003921 oil Substances 0.000 claims abstract description 65
- 238000004364 calculation method Methods 0.000 claims abstract description 42
- 238000001228 spectrum Methods 0.000 claims description 24
- 238000012937 correction Methods 0.000 claims description 11
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- 238000009966 trimming Methods 0.000 description 7
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- 238000002485 combustion reaction Methods 0.000 description 1
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Classifications
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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
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
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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
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0253—Fully variable control of valve lift and timing using camless actuation systems such as hydraulic, pneumatic or electromagnetic actuators, e.g. solenoid valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Combustion & Propulsion (AREA)
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- Electromagnetism (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The invention belongs to the technical field of control of an engine gas distribution system, and relates to a rail pressure control method and a rail pressure control system of an engine variable valve. Comprising the following steps: and selecting a calculation mode of the engine oil low-pressure pump driving duty ratio according to the working condition data, and calculating the engine oil low-pressure pump driving duty ratio. And driving the engine oil low-pressure pump to operate according to the engine oil low-pressure pump driving duty ratio so that the engine oil pressure in the engine oil low-pressure rail is in a preset engine oil low-pressure range. And selecting a metering valve driving duty ratio calculation mode according to the working condition data, and calculating the metering valve driving duty ratio. And driving the metering valve to operate according to the driving duty ratio of the metering valve so as to enable the oil pressure in the oil high-pressure rail to be in a preset oil high-pressure range. According to the engine low-pressure valve and the metering valve, the engine low-pressure valve and the metering valve are regulated in real time according to the running condition of the engine, so that the rail pressure of the system is always stabilized near the preset rail pressure, and further, the accurate control of the valve timing and the valve lift is ensured.
Description
Technical Field
The invention belongs to the technical field of control of an engine gas distribution system, and relates to a rail pressure control method and a rail pressure control system of an engine variable valve.
Background
Because the traditional engine is fixed in structure, in the running process of the engine, the distribution parameters of the traditional engine can only ensure that the performance of the internal combustion engine is optimal under a certain working condition, the traditional engine can not realize variable valve phase and lift, and the traditional engine can not meet the general requirements of high efficiency, low oil consumption and low emission of the engine at present.
Thus variable valve technology has evolved. The variable valve technology can realize continuous variable valve opening time, valve opening duration and valve lift according to the change of the working condition of the engine, and the realization of the functions needs hydraulic stability in the valve timing control mechanism as a support. The prior art focuses mainly on structural changes of the valve timing control mechanism, but is rarely concerned with the hydraulic control method in the mechanism.
Disclosure of Invention
The invention provides a rail pressure control method and a control system for a variable valve of an engine, which aim to solve the technical problems in the prior art.
The invention provides a rail pressure control method of a variable valve of an engine, which comprises the following steps:
acquiring working condition data of an engine during operation;
generating an engine oil low-pressure pump driving duty ratio according to the working condition data;
driving the engine oil low-pressure pump to operate according to the engine oil low-pressure pump driving duty ratio so as to enable the engine oil pressure in the engine oil low-pressure rail to be in a preset engine oil low-pressure range;
generating a metering valve driving duty ratio according to the working condition data;
and driving the metering valve to operate according to the driving duty ratio of the metering valve so as to enable the oil pressure in the oil high-pressure rail to be in a preset oil high-pressure range.
Further, according to the working condition data, generating an engine oil low-pressure pump driving duty ratio includes:
judging whether the working condition data of the engine in running meets a first preset condition or not;
when the first preset condition is met, judging whether working condition data of the engine in running meet a second preset condition, otherwise, selecting a second engine oil low-pressure pump driving duty ratio calculation mode;
when the second preset condition is met, selecting a first engine oil low-pressure pump driving duty ratio calculation mode, otherwise judging whether working condition data of an engine in operation meet a third preset condition;
and when the third preset condition is met, selecting a third engine oil low-pressure pump driving duty ratio calculation mode, otherwise, selecting a second engine oil low-pressure pump driving duty ratio calculation mode.
Further, the first preset condition includes: the engine speed is greater than zero;
the second preset condition includes: the engine speed is greater than an engine oil low pressure control speed threshold;
the third preset condition includes: the oil pressure of the oil low pressure rail is smaller than the upper limit of a preset oil low pressure range.
Further, the first engine oil low pressure pump driving duty ratio calculation mode includes:
obtaining engine oil target low pressure according to the engine speed, the engine oil temperature and the engine oil target low pressure pulse spectrum;
calculating to obtain the driving duty ratio step of the engine oil low-pressure pump through a PID closed-loop control algorithm according to the difference between the engine oil target low pressure and the engine oil pressure of the engine oil low-pressure rail;
adding the engine oil low-pressure pump driving duty ratio of the previous period with the step length of the engine oil low-pressure pump driving duty ratio to obtain an engine oil low-pressure pump driving duty ratio calculated value;
limiting the calculated value of the engine oil low-pressure pump driving duty ratio to obtain the engine oil low-pressure pump driving duty ratio;
the second engine oil low-pressure pump driving duty ratio calculation mode comprises the following steps:
the engine oil low pressure pump driving duty cycle calculated value is equal to the engine oil low pressure pump closing duty cycle;
and limiting the calculated driving duty ratio value of the engine oil low-pressure pump to obtain the driving duty ratio of the engine oil low-pressure pump.
The third engine oil low-pressure pump driving duty ratio calculation mode comprises the following steps:
obtaining the engine oil low-pressure pump starting duty ratio according to the engine speed, the engine oil quantity and the engine oil low-pressure pump starting duty ratio pulse spectrum;
according to the engine oil temperature and an engine oil low-pressure pump starting correction coefficient curve, obtaining an engine oil low-pressure pump starting correction coefficient, multiplying the engine oil low-pressure pump starting correction coefficient by an engine oil low-pressure pump starting duty ratio, and obtaining an engine oil low-pressure pump driving duty ratio calculated value;
and limiting the calculated driving duty ratio value of the engine oil low-pressure pump to obtain the driving duty ratio of the engine oil low-pressure pump.
Further, the method further comprises the steps of executing after acquiring the working condition data of the engine during operation:
and modifying an engine oil low pressure building-up zone bit according to the engine oil pressure of the engine oil low pressure rail and the engine oil low pressure control threshold, wherein the engine oil low pressure building-up zone bit is 0 or 1.
Further, generating the metering valve drive duty cycle according to the operating condition data includes:
judging whether a fourth preset condition for entering full closed-loop control is met or not according to the working condition data and the engine oil low-pressure building zone bit when the engine is running;
and when the fourth preset condition is met, selecting a first metering valve driving duty ratio calculation mode, and otherwise selecting a second metering valve driving duty ratio calculation mode.
Further, the fourth preset condition includes that the engine speed is greater than an engine oil high pressure control speed threshold, the engine oil pressure of the engine oil high pressure rail is greater than an upper limit value of a preset engine oil high pressure range, and the engine oil low pressure build-up flag bit is 1.
Further, the first metering valve driving duty ratio calculation mode includes:
obtaining engine oil target pressure according to the engine speed, the engine oil quantity and the engine oil target pressure pulse spectrum;
calculating to obtain a first metering valve driving duty ratio step length through a PID closed-loop control algorithm according to the difference value between the engine oil pressure of the engine oil high-pressure rail and the engine oil target pressure;
adding the duty ratio of the metering valve in the previous period with the step length of the driving duty ratio of the first metering valve to obtain a calculated value of the driving duty ratio of the metering valve;
limiting the calculated value of the driving duty ratio of the metering valve to obtain the driving duty ratio of the metering valve;
the second metering valve driving duty ratio calculation mode comprises the following steps:
obtaining a metering valve target current according to the engine speed, the engine oil temperature and a metering valve target current pulse spectrum;
calculating to obtain a second metering valve driving duty ratio step through a PID closed-loop control algorithm according to the difference value of the metering valve target current and the metering valve actual current;
adding the basic value of the driving duty ratio of the metering valve and the step length of the driving duty ratio of the second metering valve to obtain the calculated value of the driving duty ratio of the metering valve;
and limiting the calculated value of the driving duty ratio of the metering valve to obtain the driving duty ratio of the metering valve.
Another aspect of the present invention provides a control system for a variable valve of an engine, including: the engine variable valve rail pressure control method comprises a controller, a sensor module, an engine oil low-pressure pump, a metering valve, an engine oil low-pressure rail, an engine oil high-pressure rail, a valve control electromagnetic valve and a valve, wherein the controller is respectively in communication connection with the engine oil low-pressure pump and the metering valve, the metering valve is connected with the engine oil high-pressure rail through an oil pipe, the engine oil high-pressure rail is connected with the valve control electromagnetic valve through an oil pipe, the engine oil low-pressure pump is connected with the engine oil low-pressure rail through an oil pipe, the engine oil low-pressure rail is connected with the valve control electromagnetic valve through an oil pipe, the valve control electromagnetic valve is used for controlling the opening and closing degree of the valve, the sensor module is in communication connection with the controller and is used for acquiring working condition data when an engine runs, and the controller is used for any one of the engine variable valve rail pressure control method.
Further, the sensor module includes a crankshaft position sensor, an oil temperature sensor, an oil low pressure sensor, an oil high pressure sensor.
The invention has the beneficial effects that: according to the engine low-pressure valve and the metering valve, the engine low-pressure valve and the metering valve are regulated in real time according to the running condition of the engine, so that the rail pressure of the system is always stabilized near the preset rail pressure, and further, the accurate control of the valve timing and the valve lift is ensured. In the normal temperature starting process of the engine, the engine oil low pressure and the engine oil high pressure can be quickly established so as to realize the normal operation of the valve, the starting time of the engine is shortened, and when the engine is started under severe low temperature conditions, the engine oil low pressure and the engine oil high pressure can be quickly established so as to realize the normal operation of the valve, and the engine is prevented from being unable to be started normally under low temperature.
Drawings
Fig. 1 is a flow chart of the present invention.
Fig. 2 is a flow chart of the engine oil low pressure control in the present invention.
Fig. 3 is a flow chart of the engine oil high pressure control in the present invention.
Fig. 4 is a schematic structural view of a variable valve control system in the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings, in which the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the embodiment of the present invention, fig. 1 is a flowchart provided by specific flow steps of a rail pressure control method for an engine variable valve according to the present invention, and it should be noted that the present invention may be implemented in the form of program instructions, and sequential steps may be exchanged as necessary in the present invention.
As shown in fig. 1, the specific steps of the present invention include:
s10: and acquiring working condition data when the engine runs, wherein the working condition data comprises engine speed, engine oil temperature, engine oil pressure of an engine oil low-pressure rail, engine oil pressure of an engine oil high-pressure rail and engine oil quantity.
The operating condition data of the engine during operation can be obtained by a sensor, and in particular, the engine speed can be obtained by a crank position sensor signal, the engine oil temperature can be obtained by an engine oil temperature sensor signal, the engine oil low pressure can be obtained by an engine oil low pressure sensor signal, the engine oil high pressure can be obtained by an engine oil high pressure sensor, and the engine oil quantity can be obtained by an engine controller.
S20: and generating the engine oil low-pressure pump driving duty ratio according to the working condition data.
In the invention, the rail hydraulic pressure of the engine comprises the oil pressure of the oil low-pressure rail and the oil pressure of the oil high-pressure rail, and the rail pressure stability of the variable valve of the engine is realized by adjusting the oil pressures of the oil low-pressure rail and the oil high-pressure rail.
The method comprises the steps of adjusting the engine oil pressure of an engine oil low pressure rail, specifically, judging the engine oil low pressure pump driving duty ratio through the calculation mode of engine speed and engine oil temperature, calculating the low pressure pump driving duty ratio, and controlling the engine oil low pressure pump to operate by sending a driving signal of the low pressure pump driving duty ratio, so that the existing pressure of the engine oil low pressure rail is stable.
The method comprises the following steps:
judging whether the working condition data of the engine in running meets a first preset condition.
Wherein the first preset condition includes the engine speed being greater than zero. The method comprises the steps of judging the rotation speed of an engine, selecting different engine oil low-pressure pump driving duty ratio calculation modes according to different working conditions, and considering the engine as being started when the rotation speed of the engine is greater than 0.
And when the first preset condition is met, judging whether working condition data of the engine in running meet a second preset condition, and otherwise, selecting a second engine oil low-pressure pump driving duty ratio calculation mode.
When the engine is judged to be larger than 0, judging the rotating speed of the engine again, wherein the judging conditions are second preset conditions, and the second preset conditions are as follows: the engine speed is greater than an engine oil low pressure control speed threshold, wherein the range of the engine oil low pressure control speed threshold is 100 rpm-180 rpm, the engine oil low pressure control speed threshold is lower than the engine dragging speed, and if the dragging speed is 200rpm, the engine oil low pressure control speed threshold is 150rpm. When the oil pressure is lower than the value, the low-pressure engine oil pump supplies oil with a larger opening degree, which is beneficial to quickly establishing rail pressure.
And if the engine speed is equal to 0, directly selecting a second engine oil low-pressure pump driving duty ratio calculation mode, wherein the second engine oil low-pressure pump driving duty ratio calculation mode comprises the following steps:
s206: the engine oil low pressure pump driving duty cycle calculated value is obtained according to a preset engine oil low pressure pump closing value, specifically, the engine oil low pressure pump driving duty cycle calculated value is equal to the engine oil low pressure pump closing duty cycle.
The engine oil low pressure pump closing duty ratio refers to a duty ratio when the engine oil low pressure pump is closed.
S209: and limiting the calculated driving duty ratio value of the engine oil low-pressure pump to obtain the driving duty ratio of the engine oil low-pressure pump. The calculated driving duty ratio of the engine oil low-pressure pump is limited to the maximum value, the maximum value cannot exceed the preset maximum value of the driving duty ratio of the engine oil low-pressure pump, and the minimum value cannot be lower than the preset minimum value of the driving duty ratio of the engine oil low-pressure pump. The preset maximum value of the driving duty ratio of the engine oil low-pressure pump refers to the duty ratio corresponding to the maximum opening of the engine oil low-pressure pump, and the preset minimum value of the driving duty ratio of the engine oil low-pressure pump refers to the duty ratio corresponding to the minimum opening of the engine oil low-pressure pump. And when the engine oil low pressure pump driving duty ratio calculated value is smaller than the engine oil low pressure pump driving duty ratio preset minimum value, the engine oil low pressure pump driving duty ratio preset minimum value is used as the engine oil low pressure pump driving duty ratio calculated value. And when the engine oil low-pressure pump driving duty ratio calculated value is between the engine oil low-pressure pump driving duty ratio calculated value and the engine oil low-pressure pump driving duty ratio calculated value, adopting the engine oil low-pressure pump driving duty ratio calculated value as the engine oil low-pressure pump driving duty ratio.
And when the second preset condition is met, selecting a first engine oil low-pressure pump driving duty ratio calculation mode, otherwise judging whether working condition data of the engine in operation meet a third preset condition.
When the engine speed exceeds the engine oil low pressure control speed threshold, selecting a first engine oil low pressure pump driving duty ratio calculation mode, wherein the first engine oil low pressure pump driving duty ratio calculation mode comprises:
s202: and obtaining the engine oil target low pressure according to the engine speed, the engine oil temperature and the engine oil target low pressure pulse spectrum.
And when the engine speed exceeds the engine oil low pressure control speed threshold, checking an engine oil target low pressure pulse spectrum according to the engine speed and the engine oil temperature to obtain the engine oil target low pressure. The engine oil target low pressure pulse spectrum is a mapping relation among an engine speed, an engine oil temperature and an engine oil target low pressure, and is specifically shown in table 1, wherein an abscissa is the engine oil temperature, an ordinate is the engine speed, and a preset target low pressure is changed according to the change of the engine oil temperature, the engine oil temperature and the engine oil target low pressure. The engine oil target low-pressure pulse spectrum is preset in the controller, and when the controller needs to adopt, the engine oil target low-pressure pulse spectrum is called.
TABLE 1
| 0.0 | 20.0 | 40.0 | 60.0 | 80.0 | 100.0 | 120.0 | |
| 600 | 13.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 800 | 13.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 1000 | 13.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 1200 | 15.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 1400 | 15.0 | 15.0 | 13.5 | 13.5 | 11.0 | 11.0 | 11.0 |
| 1600 | 15.0 | 15.0 | 13.5 | 13.5 | 11.0 | 11.0 | 11.0 |
| 2000 | 15.0 | 15.0 | 13.0 | 13.0 | 11.0 | 11.0 | 11.0 |
| 2200 | 15.0 | 15.0 | 13.0 | 13.0 | 11.0 | 11.0 | 11.0 |
And calculating to obtain the driving duty ratio step of the engine oil low-pressure pump through a PID closed-loop control algorithm according to the difference between the engine oil target low pressure and the engine oil pressure of the engine oil low-pressure rail.
S203: and obtaining the low pressure difference of the engine oil according to the difference between the target low pressure of the engine oil and the low pressure of the engine oil.
S204: and obtaining the driving duty cycle step of the engine oil low pressure pump through a PID closed-loop control algorithm according to the engine oil low pressure difference.
S205: and adding the engine oil low-pressure pump driving duty ratio of the previous period with the step length of the engine oil low-pressure pump driving duty ratio to obtain an engine oil low-pressure pump driving duty ratio calculated value.
S202 to S205 form a complete closed-loop control flow, and the step length of the driving duty ratio of the engine oil low-pressure pump obtained by calculation in S204 is a trimming value used for trimming the driving duty ratio of the engine oil low-pressure pump in the previous period, so that when the engine oil low-pressure pump is driven by adopting a signal of the driving duty ratio of the engine oil low-pressure pump, the engine oil pressure in an engine oil low-pressure rail can be in a preset engine oil low-pressure range. For example, the driving duty ratio of the engine oil low-pressure pump at the last moment is 20%, the target low pressure is 10bar, the measured engine oil low pressure is 8bar, and the engine oil low pressure difference is 2bar; the PID belongs to a general algorithm in the control algorithm, and assuming that the P term coefficient is 0.001, the d term coefficient is 0.01, and the driving duty ratio step length calculated by the PID module is 0.02%, the engine oil low pressure pump at the current moment is driven to 20% +0.02% = 20.02%.
S209: and limiting the calculated driving duty ratio value of the engine oil low-pressure pump to obtain the driving duty ratio of the engine oil low-pressure pump. Specifically, S209 is the same as described above.
If the engine speed does not exceed the engine oil low pressure control speed threshold, whether a third judgment condition is met is needed to be judged, wherein the third judgment condition comprises: the oil pressure of the oil low pressure rail is smaller than the upper limit of a preset oil low pressure range. The low pressure range of the preset engine oil is specifically 10-15 bar.
And when the third preset condition is met, selecting a third engine oil low-pressure pump driving duty ratio calculation mode, otherwise, selecting a second engine oil low-pressure pump driving duty ratio calculation mode.
The driving duty ratio calculation mode of the third engine oil low-pressure pump comprises the following steps:
s207: and obtaining the engine oil low-pressure pump starting duty ratio according to the engine speed, the engine oil quantity and the engine oil low-pressure pump starting duty ratio pulse spectrum.
And if the engine speed is greater than 0 and does not exceed the engine oil low pressure control speed threshold, checking an engine oil low pressure pump starting duty cycle pulse spectrum according to the engine speed and the engine oil quantity to obtain the engine oil low pressure pump starting duty cycle, wherein the engine oil low pressure pump starting duty cycle pulse spectrum is specifically a mapping relation among the engine speed, the engine oil quantity and the starting duty cycle. Specifically, as shown in table 2, the abscissa represents the engine speed and the ordinate represents the engine oil amount.
TABLE 2
| 50.0 | 80.0 | 100.0 | 120.0 | 180.0 | |
| 50.0 | 25％ | 25％ | 25％ | 28％ | 30％ |
| 100.0 | 20％ | 25％ | 25％ | 25％ | 25％ |
| 150.0 | 20％ | 25％ | 25％ | 25％ | 25％ |
| 200.0 | 18％ | 25％ | 25％ | 25％ | 25％ |
S208: and according to the engine oil temperature and the engine oil low-pressure pump start correction coefficient curve, obtaining an engine oil low-pressure pump start correction coefficient, multiplying the engine oil low-pressure pump start correction coefficient by the engine oil low-pressure pump start duty cycle, and obtaining an engine oil low-pressure pump drive duty cycle calculated value.
The engine oil low pressure pump start correction coefficient curve is a mapping relationship between engine oil temperature and correction coefficient, specifically, as shown in table 3, the X-axis is engine oil temperature, and the Y-axis is mapping relationship. This step is to perform rapid pressure build-up, thus employing a relatively large preset opening duty cycle, but taking into account the variation in oil viscosity at different temperatures, thus requiring multiplication by a factor.
TABLE 3 Table 3
| X-axis | 0.0 | 20.0 | 40.0 | 60.0 | 80.0 | 100.0 | 120.0 |
| Y-axis | 2 | 1.5 | 1.2 | 1 | 1 | 1 | 1 |
S209: and limiting the calculated driving duty ratio value of the engine oil low-pressure pump to obtain the driving duty ratio of the engine oil low-pressure pump. The specific process is the same as the above.
S30: and driving the engine oil low-pressure pump to operate according to the engine oil low-pressure pump driving duty ratio so that the engine oil pressure in the engine oil low-pressure rail is in a preset engine oil low-pressure range.
After the driving duty ratio of the engine oil low pressure pump is obtained, a control signal is sent according to the duty ratio to control the engine oil low pressure pump to operate, and the opening degree is adjusted so that the engine oil pressure in the engine oil low pressure rail is in a preset engine oil low pressure range.
In the present invention, it further includes executing after the acquisition of the operating condition data at the time of engine operation:
and modifying an engine oil low pressure building-up zone bit according to the engine oil pressure of the engine oil low pressure rail and the engine oil low pressure control threshold, wherein the engine oil low pressure building-up zone bit is 0 or 1. And when the low pressure of the engine oil exceeds the low pressure control threshold of the engine oil, the low pressure building mark position 1 of the engine oil, otherwise, the low pressure building mark position of the engine oil is 0. The engine oil low pressure control threshold refers to a limit value of low pressure control, and is typically 8bar. When the oil low pressure is lower than this value, the high pressure portion is not driven, and therefore the high pressure must be built up after the low pressure is built up.
S40: generating a metering valve driving duty ratio according to the working condition data;
judging whether a fourth preset condition for entering full closed-loop control is met or not according to the working condition data and the engine oil low-pressure building zone bit when the engine is running;
specific: judging whether the system enters a rail pressure full closed-loop control mode according to the engine speed, the engine oil rail pressure and the engine oil low pressure building-up zone bit, wherein the fourth preset condition comprises: the engine speed is greater than the engine oil high pressure control speed threshold, the engine oil pressure of the engine oil high pressure rail is greater than the upper limit value of the preset engine oil high pressure range, the engine oil low pressure build-up flag bit is 1, when the condition is met, the rail pressure full closed-loop control mode is entered, and otherwise, the rail pressure full closed-loop mode is not entered.
The range of the engine oil high pressure control rotation speed threshold is 100 rpm-180 rpm, and the value is larger than the engine oil low pressure control rotation speed threshold, and the preset engine oil high pressure range is generally 50-200 bar, so 200bar is the upper limit value of the preset engine oil high pressure range.
When a fourth preset condition is met, namely the system enters a rail pressure full closed-loop control mode, a first metering valve driving duty ratio calculation mode is selected, and otherwise, a second metering valve driving duty ratio calculation mode is selected.
The first metering valve driving duty ratio calculation mode comprises the following steps:
s402: and obtaining the engine oil target pressure according to the engine speed, the engine oil quantity and the engine oil target pressure pulse spectrum. If the engine oil pressure is in the rail pressure full closed-loop control mode, the engine oil target rail pressure pulse spectrum is checked according to the engine speed and the engine oil quantity to obtain the engine oil target rail pressure. The engine oil target pressure pulse spectrum refers to a mapping relation diagram of engine speed, engine oil quantity and engine oil target pressure. The engine oil target pressure pulse spectrum is shown in table 4, wherein the X axis is the engine oil quantity, and the Y axis is the engine speed.
TABLE 4 Table 4
S403: obtaining an engine oil rail pressure difference according to the difference between the engine oil target rail pressure and the engine oil rail pressure;
s404: obtaining the driving duty ratio step length of the metering valve through a PID closed-loop control algorithm according to the engine oil rail pressure difference;
and calculating to obtain the driving duty ratio step length of the first metering valve through a PID closed-loop control algorithm according to the difference value between the engine oil pressure of the engine oil high-pressure rail and the engine oil target pressure.
S405: and adding the duty ratio of the metering valve in the previous period with the step length of the driving duty ratio of the first metering valve to obtain the calculated value of the driving duty ratio of the metering valve.
The step length of the metering valve driving duty ratio obtained by calculation in the step S404 is a trimming value, and the trimming value is used for trimming the metering valve driving duty ratio in the previous period, so that when the metering valve is driven to be long by adopting a signal of the metering valve driving duty ratio, the engine oil pressure in the engine oil high-pressure rail can be in a preset engine oil high-pressure range.
S410: and limiting the calculated value of the driving duty ratio of the metering valve to obtain the driving duty ratio of the metering valve. The calculated value of the driving duty ratio of the metering valve is limited to the maximum value, the maximum value cannot exceed the preset maximum value of the driving duty ratio of the metering valve, and the minimum value cannot be lower than the preset minimum value of the driving duty ratio of the metering valve. The preset maximum value of the driving duty ratio of the metering valve is the duty ratio corresponding to the maximum opening of the metering valve, and the preset minimum value of the driving duty ratio of the metering valve is the duty ratio corresponding to the minimum opening of the metering valve. When the calculated metering valve driving duty ratio is larger than the preset maximum value of the metering valve driving duty ratio, the preset maximum value of the metering valve driving duty ratio is adopted as the metering valve driving duty ratio, and when the calculated metering valve driving duty ratio is smaller than the preset minimum value of the metering valve driving duty ratio, the preset minimum value of the metering valve driving duty ratio is adopted as the calculated metering valve driving duty ratio. And when the metering valve driving duty ratio calculated value is between the metering valve driving duty ratio calculated value and the metering valve driving duty ratio calculated value, the metering valve driving duty ratio calculated value is used as the metering valve driving duty ratio.
The second metering valve driving duty ratio calculation mode:
s406: and obtaining the target current of the metering valve according to the engine speed, the engine oil temperature and the target current pulse spectrum of the metering valve. And checking a metering valve target current pulse spectrum according to the engine speed and the engine oil temperature to obtain the metering valve target current, wherein the metering valve target current pulse spectrum is a mapping relation of the engine speed, the engine oil temperature and the metering valve target current. The target current pulse spectrum of the metering valve is shown in table 5, wherein the abscissa of the table is the engine oil temperature, and the ordinate is the engine speed.
TABLE 5
| 0.0 | 20.0 | 40.0 | 60.0 | 80.0 | 100.0 | 120.0 | |
| 600 | 13.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 800 | 13.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 1000 | 13.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 1200 | 15.0 | 12.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| 1400 | 15.0 | 15.0 | 13.5 | 13.5 | 11.0 | 11.0 | 11.0 |
| 1600 | 15.0 | 15.0 | 13.5 | 13.5 | 11.0 | 11.0 | 11.0 |
| 2000 | 15.0 | 15.0 | 13.0 | 13.0 | 11.0 | 11.0 | 11.0 |
| 2200 | 15.0 | 15.0 | 13.0 | 13.0 | 11.0 | 11.0 | 11.0 |
S407: obtaining a metering valve current difference according to the difference between the metering valve target current and the metering valve actual current;
s408: and calculating according to the current difference of the metering valve through a PID closed-loop control algorithm to obtain the driving duty ratio step length of the metering valve.
And calculating to obtain the driving duty ratio step of the second metering valve through a PID closed-loop control algorithm according to the difference value of the target current of the metering valve and the actual current of the metering valve.
S409: and adding the metering valve driving duty ratio basic value and the step length of the second metering valve driving duty ratio to obtain a metering valve driving duty ratio calculated value. The metering valve drives the intermediate value of the duty ratio basic value general duty ratio range, a feedforward value is set as the basic value for obtaining an accurate calculated value in a fast closed loop, if the duty ratio range is between 10% and 20%, an intermediate value is set as the basic value, and then the upper closed loop and the lower closed loop are calculated.
The step length of the metering valve driving duty ratio obtained by calculation in the step S408 is a trimming value, and is used for trimming the metering valve driving duty ratio in the previous period, so that when the metering valve is driven to be long by adopting the signal of the metering valve driving duty ratio, the engine oil pressure in the engine oil high-pressure rail can be in the preset engine oil high-pressure range. If the basic value is 15%, the target current is 1400mA, and the actual current is 1300mA, the duty ratio at the current moment is 15% + duty ratio calculated by the PID module (calculated according to the current difference of 100 mA) is 0.02% = 15.02%.
S410: and limiting the calculated value of the driving duty ratio of the metering valve to obtain the driving duty ratio of the metering valve.
S50: and driving the metering valve to operate according to the driving duty ratio of the metering valve so as to enable the oil pressure in the oil high-pressure rail to be in a preset oil high-pressure range. After the driving duty ratio of the metering valve is obtained, a control signal is sent according to the duty ratio so as to adjust the opening of the metering valve, and the oil pressure in the oil high-pressure rail is in a preset oil high-pressure range.
In another aspect of the present invention, as shown in fig. 4, there is provided a control system for a variable valve of an engine, including a variable valve electric control system controller 3, a sensor module 4, an oil low pressure pump 5, a metering valve 6, an oil low pressure rail 8, an oil high pressure rail 7, a valve control solenoid valve 9, and a valve 10, wherein the variable valve electric control system controller 3 is respectively in communication connection with the oil low pressure pump 5 and the metering valve 6, the metering valve 6 is connected with the oil high pressure rail 7 through an oil pipe, the oil high pressure rail 7 is connected with the valve control solenoid valve 9 through an oil pipe, the oil low pressure rail 5 is connected with the oil low pressure rail 8 through an oil pipe, the oil low pressure rail 8 is connected with the valve control solenoid valve 9 through an oil pipe, the valve control solenoid valve 9 is used for controlling the opening and closing degree of the valve 10, the sensor module 4 is in communication connection with the variable valve electric control system controller 3, and is used for acquiring working condition data when the engine is running, and the variable electric control system controller 3 is used for executing any of the variable valve control method for controlling the variable valve of the engine.
Specifically, the sensor module 4 includes a crank position sensor, an oil temperature sensor, an oil low pressure sensor, and an oil high pressure sensor.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (9)
1. A rail pressure control method of a variable valve of an engine, comprising:
acquiring working condition data of an engine during operation;
generating an engine oil low-pressure pump driving duty ratio according to the working condition data;
driving the engine oil low-pressure pump to operate according to the engine oil low-pressure pump driving duty ratio so as to enable the engine oil pressure in the engine oil low-pressure rail to be in a preset engine oil low-pressure range;
generating a metering valve driving duty ratio according to the working condition data;
driving the metering valve to operate according to the driving duty ratio of the metering valve so as to enable the oil pressure in the oil high-pressure rail to be in a preset oil high-pressure range;
and generating the engine oil low-pressure pump driving duty ratio according to the working condition data, wherein the engine oil low-pressure pump driving duty ratio comprises the following steps:
judging whether the working condition data of the engine in running meets a first preset condition or not;
when the first preset condition is met, judging whether working condition data of the engine in running meet a second preset condition, otherwise, selecting a second engine oil low-pressure pump driving duty ratio calculation mode;
when the second preset condition is met, selecting a first engine oil low-pressure pump driving duty ratio calculation mode, otherwise judging whether working condition data of an engine in operation meet a third preset condition;
and when the third preset condition is met, selecting a third engine oil low-pressure pump driving duty ratio calculation mode, otherwise, selecting a second engine oil low-pressure pump driving duty ratio calculation mode.
2. The engine variable valve rail pressure control method according to claim 1, characterized in that the first preset condition includes: the engine speed is greater than zero;
the second preset condition includes: the engine speed is greater than the engine oil low pressure control speed threshold;
the third preset condition includes: the oil pressure of the oil low pressure rail is less than the upper limit of the preset oil low pressure range.
3. The method for controlling the rail pressure of the variable valve of the engine according to claim 1, wherein the first engine oil low pressure pump driving duty ratio calculation means includes:
obtaining engine oil target low pressure according to the engine speed, the engine oil temperature and the engine oil target low pressure pulse spectrum;
calculating to obtain the driving duty ratio step of the engine oil low-pressure pump through a PID closed-loop control algorithm according to the difference between the engine oil target low pressure and the engine oil pressure of the engine oil low-pressure rail;
adding the engine oil low-pressure pump driving duty ratio of the previous period with the step length of the engine oil low-pressure pump driving duty ratio to obtain an engine oil low-pressure pump driving duty ratio calculated value;
limiting the calculated value of the engine oil low-pressure pump driving duty ratio to obtain the engine oil low-pressure pump driving duty ratio;
the second engine oil low-pressure pump driving duty ratio calculation mode comprises the following steps:
the engine oil low pressure pump driving duty cycle calculated value is equal to the engine oil low pressure pump closing duty cycle;
limiting the calculated value of the engine oil low-pressure pump driving duty ratio to obtain the engine oil low-pressure pump driving duty ratio;
the third engine oil low-pressure pump driving duty ratio calculation mode comprises the following steps:
obtaining the engine oil low-pressure pump starting duty ratio according to the engine speed, the engine oil quantity and the engine oil low-pressure pump starting duty ratio pulse spectrum;
according to the engine oil temperature and an engine oil low-pressure pump starting correction coefficient curve, obtaining an engine oil low-pressure pump starting correction coefficient, multiplying the engine oil low-pressure pump starting correction coefficient by an engine oil low-pressure pump starting duty ratio, and obtaining an engine oil low-pressure pump driving duty ratio calculated value;
and limiting the calculated driving duty ratio value of the engine oil low-pressure pump to obtain the driving duty ratio of the engine oil low-pressure pump.
4. The engine variable valve rail pressure control method according to claim 1, further comprising, after the acquisition of the operating condition data at the time of engine operation, executing:
and modifying an engine oil low pressure building-up zone bit according to the engine oil pressure of the engine oil low pressure rail and the engine oil low pressure control threshold, wherein the engine oil low pressure building-up zone bit is 0 or 1.
5. The method of engine variable valve rail pressure control of claim 4 wherein generating a metering valve drive duty cycle based on the operating condition data comprises:
judging whether a fourth preset condition for entering full closed-loop control is met or not according to the working condition data and the engine oil low-pressure building zone bit when the engine is running;
and when the fourth preset condition is met, selecting a first metering valve driving duty ratio calculation mode, and otherwise selecting a second metering valve driving duty ratio calculation mode.
6. The method for controlling rail pressure of an engine variable valve according to claim 5, wherein the fourth preset condition includes an engine speed greater than an engine oil high pressure control speed threshold and an engine oil pressure of an engine oil high pressure rail greater than an upper limit value of a preset engine oil high pressure range and an engine oil low pressure build-up flag being 1.
7. The method of controlling a rail pressure of an engine variable valve according to claim 5, wherein the first metering valve driving duty calculation means includes:
obtaining engine oil target pressure according to the engine speed, the engine oil quantity and the engine oil target pressure pulse spectrum;
calculating to obtain a first metering valve driving duty ratio step length through a PID closed-loop control algorithm according to the difference value between the engine oil pressure of the engine oil high-pressure rail and the engine oil target pressure;
adding the duty ratio of the metering valve in the previous period with the step length of the driving duty ratio of the first metering valve to obtain a calculated value of the driving duty ratio of the metering valve;
limiting the calculated value of the driving duty ratio of the metering valve to obtain the driving duty ratio of the metering valve;
the second metering valve driving duty ratio calculation mode comprises the following steps:
obtaining a metering valve target current according to the engine speed, the engine oil temperature and a metering valve target current pulse spectrum;
calculating to obtain a second metering valve driving duty ratio step through a PID closed-loop control algorithm according to the difference value of the metering valve target current and the metering valve actual current;
adding the basic value of the driving duty ratio of the metering valve and the step length of the driving duty ratio of the second metering valve to obtain the calculated value of the driving duty ratio of the metering valve;
and limiting the calculated value of the driving duty ratio of the metering valve to obtain the driving duty ratio of the metering valve.
8. A control system of a variable valve of an engine, characterized by comprising a variable valve electric control system controller (3), a sensor module (4), an engine oil low pressure pump (5), a metering valve (6), an engine oil low pressure rail (8), an engine oil high pressure rail (7), a valve control solenoid valve (9) and a valve (10), wherein the variable valve electric control system controller (3) is respectively in communication connection with the engine oil low pressure pump (5) and the metering valve (6), the metering valve (6) is connected with the engine oil high pressure rail (7) through an oil pipe, the engine oil high pressure rail (7) is connected with the valve control solenoid valve (9) through an oil pipe, the engine oil low pressure pump (5) is connected with the engine oil low pressure rail (8) through an oil pipe, the valve control solenoid valve (9) is used for controlling the opening and closing degree of the valve (10), the sensor module (4) is in communication connection with the variable electric control system controller (3) and is used for acquiring the operating condition data of the variable valve electric control system (1-the engine, and the variable valve electric control system (1) is used for executing the variable valve control method.
9. The control system of an engine variable valve according to claim 8, characterized in that the sensor module (4) includes a crank position sensor, an oil temperature sensor, an oil low pressure sensor, an oil high pressure sensor.
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