CN109083755A - A kind of engine valve control method and device - Google Patents
A kind of engine valve control method and device Download PDFInfo
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- CN109083755A CN109083755A CN201811162961.7A CN201811162961A CN109083755A CN 109083755 A CN109083755 A CN 109083755A CN 201811162961 A CN201811162961 A CN 201811162961A CN 109083755 A CN109083755 A CN 109083755A
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- Prior art keywords
- engine
- valve
- preset condition
- limit value
- duty ratio
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0404—Throttle position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1012—Engine speed gradient
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of engine valve control method and devices, acquire the practical aperture of target valve；Duty ratio limit value corresponding with the practical aperture of the valve is inquired in preset duty ratio limit value table, using the duty ratio limit value as the duty ratio limit value of the target valve.The present invention is by giving different duty limit value of the valve under different opening, while meeting engine duty ratio demand, avoids the generation of valve overheat damage situations, improves the reliability of valve, reduce the unnecessary wasting of resources.
Description
Technical field
The present invention relates to Mechanical course field, specially a kind of engine valve control method and device.
Background technique
Diesel engine is burning diesel oil to obtain exergonic engine, wherein exhaust gas recycles (Exhaust
Gas Recirculation, EGR) the valves type component such as valve, throttle valve is the common important spare part of diesel engine.Diesel oil
Valve type component in engine generally uses direct current generator to drive, electronic control unit (Electronic Control
Unit, ECU) output certain frequency pulse width modulation (Pulse WidthModulation, PWM) control signal control valve
The valve opening of type component.
There are many operating conditions that valve is needed to close in the operational process of diesel engine, such as diesel particulate filter
In (Diesel particulate filters, DPF) regenerative process, gone on smoothly for guarantee is regenerated, engine is entire
Need to keep the closed state of EGR valve in regenerative process, i.e. the control valve mechanical vertex that reaches its aperture 0%, but due to valve
Many reasons, the practical apertures for sometimes resulting in valve such as door aging, deformation, control precision are unable to reach demand aperture always
0%, at this point, ECU can continue to send pwm control signal to valve until reaching it according to the basic control principle of PID controller
Maximum calibration limit value, valve can generate more heat transfer under the control signal of maximum PWM duty cycle in whole process, lead to valve
Door thermal damage excessively, reduces the reliability of valve, meanwhile, ECU persistently sends invalid pwm control signal to valve and also results in
The waste of resource.
In addition, the pwm control signal control valve of several kHz, valve are generally used when using diesel engine at present
It can make a noise under high-frequency signal, when engine stall, sound is particularly evident, can reduce the comfort level of user, together
When, when engine stall, ECU still exports invalid pwm control signal to valve, causes the waste of resource.
Summary of the invention
The present invention provides a kind of engine valve control method and devices, can solve in the prior art due to ECU
Invalid pwm control signal is exported to valve, what the waste and users'comfort, valve reliability for causing resource reduced asks
Topic.
In order to achieve the above objectives, the present invention provides the following technical scheme that
A kind of engine valve control method, comprising:
Acquire the practical aperture of target valve；
Duty ratio limit value corresponding with the practical aperture of the valve is inquired, in preset duty ratio limit value table with institute
State duty ratio limit value of the duty ratio limit value as the target valve.
Optionally, the valve control method, further includes:
Determine whether the engine is in halted state；
If it is determined that the engine is in halted state, then the control signal of the target valve is cut off.
Optionally, whether the determining engine is in halted state, comprising:
Determine that the engine is according to the relative speed variation of throttle, the revolving speed of the engine and the engine
It is no to be in halted state.
Optionally, after the determination engine is in halted state, further includes:
Start timing when determining that the engine is in halted state, when timing time reaches preset time, cutting
The control signal of target valve；
Wherein, if detecting engine start before timing time reaches preset time, cancel timing.
Optionally, described to be determined according to the relative speed variation of throttle, the revolving speed of the engine and the engine
Whether the engine is in halted state, comprising:
Judge whether the throttle meets the first preset condition, engine stop is worked as in the first preset condition expression
When throttle；
Judge whether the revolving speed of the engine meets the second preset condition, engine is worked as in the second preset condition expression
Engine speed when stopping；
Judge whether the relative speed variation of the engine meets third preset condition, the third preset condition expression is worked as
The relative speed variation of engine when engine stop；
When meeting first preset condition, second preset condition and the third preset condition simultaneously, determine
The engine is in halted state.
A kind of engine valve control device, comprising:
Acquisition unit, for acquiring the practical aperture of target valve；
Query unit, for inquiring account for corresponding with the practical aperture of the valve in preset duty ratio limit value table
Empty limit ratio, using the duty ratio limit value as the duty ratio limit value of the target valve.
Optionally, the valve control device, further includes:
Determination unit, for determining whether the engine is in halted state；
Cutting unit is used for if it is determined that the engine is in halted state, then the control for cutting off the target valve is believed
Number.
Optionally, the determination unit, for according to the revolving speed of throttle, the engine and turning for the engine
Fast change rate determines whether the engine is in halted state.
Optionally, the valve control device, further includes:
Timing unit, for starting timing when determining that the engine is in halted state, when timing time reaches pre-
If when the time, cutting off the control signal of target valve；
Wherein, if detecting engine start before timing time reaches preset time, cancel timing.
Optionally, the determination unit, comprising:
First judging unit, for judging whether the throttle meets the first preset condition, the first default item
Part indicates throttle when an engine is stopped；
Second judgment unit, for judging whether the revolving speed of the engine meets the second preset condition, described second is pre-
If condition indicates engine speed when an engine is stopped；
Third judging unit, it is described for judging whether the relative speed variation of the engine meets third preset condition
Third preset condition indicates the relative speed variation of engine when an engine is stopped；
4th judging unit, for first preset condition, second preset condition and described ought to be met simultaneously
When three preset conditions, determine that the engine is in halted state.
As can be seen from the above technical solutions, engine valve control method disclosed by the invention and device, acquire target
The practical aperture of valve；Duty cycle limit corresponding with the practical aperture of the valve is inquired in preset duty ratio limit value table
Value, using the duty ratio limit value as the duty ratio limit value of the target valve.The present invention is by giving valve in different opening
Under different duty limit value, while meeting engine duty ratio demand, avoid valve overheat damage situations generation,
The reliability for improving valve reduces the unnecessary wasting of resources.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow chart of engine valve control method disclosed by the embodiments of the present invention；
Fig. 2 is the corresponding different duty limit value schematic diagram of valve of different opening；
Fig. 3 is valve controling circuit figure；
Fig. 4 is engine condition sensor circuit figure；
Fig. 5 is timing circuit figure；
Fig. 6 is a kind of schematic diagram of engine valve control device disclosed by the embodiments of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It can be seen from background technology that have many operating conditions that valve is needed to close, such as bavin in the operational process of diesel engine
In oil particles filter (Dieselparticulate filters, DPF) regenerative process, goes on smoothly, send out for guarantee is regenerated
Motivation needs to keep the closed state of EGR valve in entire regenerative process, i.e. control valve reaches the mechanical of its aperture 0% and pushes up
Point, but due to many reasons such as valve aging, deformation, control precision, consistency, sometimes result in the practical aperture of valve always
It is unable to reach demand aperture 0%, at this point, ECU can continue to send PWM control to valve according to the basic control principle of PID controller
Signal processed is until pwm control signal reaches its maximum duty ratio limit value 100% or reaches the maximum duty cycle of a certain calibration
Limit value such as 40%, valve will can generate more under the pwm control signal of maximum duty cycle limit value in entire regenerative process
Heat causes valve to cross thermal damage, reduces the reliability of valve, if in order to protect valve to demarcate maximum duty cycle limit value
It is smaller, such as maximum duty cycle limit value is demarcated as 30%, then valve 30% duty ratio when mechanical vertex controls can play
Effect is effectively protected, it is possible that in the control of normal aperture because duty ratio is limited so as to cause the change of valve transient response
Difference is even unable to reach the aperture of demand, such as needs instantaneous 40% duty ratio control under transient condition when 80% EGR aperture
Signal processed.Meanwhile during normal control, as the aging of valve carbon distribution, post-processing exhaust back pressure such as become larger at the influence of factors, together
The control signal ability control valve of the aperture demand needs more big space rate of sample reaches the aperture of demand, it is contemplated that many factors
Influence, the calibration of maximum duty cycle limit value generally can be there are surplus, and that had both demarcated is slightly larger, such as 50%, but thus bring
Problem be exactly control valve reach aperture 0% mechanical vertex when valve can be made to cross thermal damage.
Meanwhile ECU continues to send the waste that invalid pwm control signal also results in resource to valve.
In addition, the pwm control signal control valve of several kHz, valve are generally used when using diesel engine at present
It can make a noise under high-frequency signal, when engine stall, sound is particularly evident, can reduce the comfort level of user, together
When, when engine stall, the opening control signal of ECU still output valve makes valve be in 0% aperture, or is it
It demarcates aperture and causes the waste of resource at this point, ECU exports invalid pwm control signal to valve.
The present invention provides a kind of engine valve control method and devices, can solve in the prior art due to ECU
Invalid pwm control signal is exported to valve, what the waste and users'comfort, valve reliability for causing resource reduced asks
Topic.
As shown in Figure 1, the embodiment of the invention discloses a kind of engine valve control methods, comprising the following steps:
S101, the practical aperture for acquiring target valve.
S102, duty cycle limit corresponding with the practical aperture of the valve is inquired in preset duty ratio limit value table
Value, using the duty ratio limit value as the duty ratio limit value of the target valve.
As shown in Fig. 2, being the corresponding different duty limit value schematic diagram of valve of different opening, when valve opening is smaller
Settable smaller of duty ratio limit value, to protect valve, prevent valve overheated when practical aperture is unable to reach demand aperture by
Damage, the corresponding duty ratio limit value of other valve openings must satisfy the actual demand of engine, and settable is somewhat larger.
The present embodiment is meeting engine duty ratio need by giving different duty limit value of the valve under different opening
While asking, the generation of valve overheat damage situations is avoided, the reliability of valve is improved, reduces unnecessary resource wave
Take.
Optionally, the valve control method further include:
Determine whether the engine is in halted state.
Optionally, it can be determined according to the relative speed variation of throttle, the revolving speed of the engine and the engine
Whether the engine is in halted state.
Optionally, described to be determined according to the relative speed variation of throttle, the revolving speed of the engine and the engine
Whether the engine is in halted state, comprising:
Judge whether the throttle meets the first preset condition, engine stop is worked as in the first preset condition expression
When throttle.For example, throttle is in the home position being not affected by when jamming on.
Judge whether the revolving speed of the engine meets the second preset condition, engine is worked as in the second preset condition expression
Engine speed when stopping.For example, engine speed is zero.
Judge whether the relative speed variation of the engine meets third preset condition, the third preset condition expression is worked as
The relative speed variation of engine when engine stop.For example, engine speed change rate is zero.
When meeting first preset condition, second preset condition and the third preset condition simultaneously, determine
The engine is in halted state.
During the specific fact, in judgement while first preset condition, the second default item can be met
Postponing a period of time after part and the third preset condition, a unit sends the information for determining engine stop still further below, with
Guarantee the accuracy of judgement.
If it is determined that the engine is in halted state, then the control signal of the target valve is cut off.
Optionally, timing can be started when determining that the engine is in halted state, when timing time reaches default
When the time, the control signal of target valve is cut off, wherein if detecting before timing time reaches preset time, engine is opened
It is dynamic, then cancel timing, the preset time can sets itself according to demand.
In view of possible there is a situation where stopping working or stopping in short-term to wait suddenly in the operational process of automobile, engine
It will be restarted in the very short time, the signal of cutting control at this time is not necessarily to, therefore sets a preset time, can
To guarantee the fluency of user's operation when using valve control method of the invention.
It should be noted that generally being controlled at present using the pwm control signal of several kHz when using diesel engine
Valve type component, valve can make a noise under high-frequency signal, and when engine stall, sound is particularly evident, can reduce use
The comfort level at family, meanwhile, when engine stall, electronic control unit still exports pwm control signal to valve, causes
The waste of resource.By way of cutting control signal after confirming engine stop, the resource for saving engine disappears the present invention
Consumption, while improving the comfort level of user.
For convenience of understanding, concrete example describes engine valve control method disclosed in the above embodiment of the present invention here
Operational process it is as follows:
As shown in figure 3, being valve controling circuit figure, it is equipped on the motor M of driving valve folding and obtains actual opening valve degree
Inductor, by the inductor feed back valve practical aperture, after obtaining practical aperture inquire duty ratio limit value table obtain
Duty ratio limit value corresponding with currently practical aperture, the duty ratio limit value as the pwm control signal exported to valve.
As shown in figure 4, being engine condition sensor circuit figure, in confirmation throttle, the revolving speed and engine of engine
Relative speed variation simultaneously when meeting first preset condition, second preset condition and the third preset condition, electricity
The output signal on road is 1, i.e. ThrVlv_stEng sets 1, then it is assumed that engine has been in halted state at this time.
As shown in figure 5, be timing circuit figure, when the signal for confirming that engine condition sensor circuit is sent is 1, starting meter
When, when timing reaches preset time, such as 20 seconds, then timing circuit output signal is 1, i.e. ThrVlv_stPwmSV sets 1, at this time
Switch unit in Fig. 3 receives the signal that ThrVlv_stPwmSV sets 1, is switched to the side of 0 input, that is, has cut off and be sent to valve
The control signal of door motor M.
Based on engine valve control method disclosed in the embodiments of the present invention, Fig. 6 is specifically disclosed using the hair
The engine valve control device of motivation valve control method.
As shown in fig. 6, another embodiment of the present invention discloses a kind of engine valve control device, which includes:
Acquisition unit 601, for acquiring the practical aperture of target valve.
Query unit 602, it is corresponding with the practical aperture of the valve for being inquired in preset duty ratio limit value table
Duty ratio limit value, using the duty ratio limit value as the duty ratio limit value of the target valve.
Optionally, the valve control device, further includes:
Determination unit, for determining whether the engine is in halted state.
Cutting unit is used for if it is determined that the engine is in halted state, then the control for cutting off the target valve is believed
Number.
Optionally, the determination unit, for according to the revolving speed of throttle, the engine and turning for the engine
Fast change rate determines whether the engine is in halted state.
Optionally, the valve control device, further includes:
Timing unit, for starting timing when determining that the engine is in halted state, when timing time reaches pre-
If when the time, cutting off the control signal of target valve.
Wherein, if detecting engine start before timing time reaches preset time, cancel timing.
Optionally, the determination unit, comprising:
First judging unit, for judging whether the throttle meets the first preset condition, the first default item
Part indicates throttle when an engine is stopped；
Second judgment unit, for judging whether the revolving speed of the engine meets the second preset condition, described second is pre-
If condition indicates engine speed when an engine is stopped；
Third judging unit, it is described for judging whether the relative speed variation of the engine meets third preset condition
Third preset condition indicates the relative speed variation of engine when an engine is stopped；
4th judging unit, for first preset condition, second preset condition and described ought to be met simultaneously
When three preset conditions, determine that the engine is in halted state.
Acquisition unit 601 and acquisition unit in the above engine valve control device disclosed by the embodiments of the present invention
601 specific work process, reference can be made in correspondence in engine valve control method disclosed in the above embodiment of the present invention
Hold, is not discussed here.
Engine valve control device disclosed in the present embodiment, acquisition unit acquire the practical aperture of target valve；It looks into
Unit inquiry duty ratio limit value corresponding with the practical aperture of the valve in the tabulation of preset duty cycle limit is ask, with described
Duty ratio limit value of the duty ratio limit value as the target valve.The present invention is accounted for by giving difference of the valve under different opening
Empty limit ratio avoids the generation of valve overheat damage situations, improves valve while meeting engine duty ratio demand
Reliability.
It should be noted that the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, commodity or the equipment that include a series of elements not only include those elements, but also including
Other elements that are not explicitly listed, or further include for this process, method, commodity or the intrinsic element of equipment.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that in the mistake including element
There is also other identical elements in journey, method, commodity or equipment.
It will be understood by those skilled in the art that embodiments herein can provide as method, system or computer program product.
Therefore, complete hardware embodiment, complete software embodiment or embodiment combining software and hardware aspects can be used in the application
Form.It is deposited moreover, the application can be used to can be used in the computer that one or more wherein includes computer usable program code
The shape for the computer program product implemented on storage media (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
Formula.
The above is only embodiments herein, are not intended to limit this application.To those skilled in the art,
Various changes and changes are possible in this application.It is all within the spirit and principles of the present application made by any modification, equivalent replacement,
Improve etc., it should be included within the scope of the claims of this application.
Claims (10)
1. a kind of engine valve control method characterized by comprising
Acquire the practical aperture of target valve；
Duty ratio limit value corresponding with the practical aperture of the valve is inquired in preset duty ratio limit value table, is accounted for described
Duty ratio limit value of the empty limit ratio as the target valve.
2. valve control method according to claim 1, which is characterized in that further include:
Determine whether the engine is in halted state；
If it is determined that the engine is in halted state, then the control signal of the target valve is cut off.
3. valve control method according to claim 2, which is characterized in that whether the determining engine is in stopping shape
State, comprising:
Determine whether the engine is located according to the relative speed variation of throttle, the revolving speed of the engine and the engine
In halted state.
4. valve control method according to claim 2, which is characterized in that be in and stop in the determination engine
After state, further includes:
Start timing when determining that the engine is in halted state, when timing time reaches preset time, cuts off target
The control signal of valve；
Wherein, if detecting engine start before timing time reaches preset time, cancel timing.
5. valve control method according to claim 3, which is characterized in that described according to throttle, the engine
Revolving speed and the relative speed variation of the engine determine whether the engine is in halted state, comprising:
Judge whether the throttle meets the first preset condition, first preset condition indicates when an engine is stopped
Throttle；
Judge whether the revolving speed of the engine meets the second preset condition, engine stop is worked as in the second preset condition expression
When engine speed；
Judge whether the relative speed variation of the engine meets third preset condition, the third preset condition, which indicates to work as, starts
The relative speed variation of engine when machine stops；
When meeting first preset condition, second preset condition and the third preset condition simultaneously, described in determination
Engine is in halted state.
6. a kind of engine valve control device characterized by comprising
Acquisition unit, for acquiring the practical aperture of target valve；
Query unit, for inquiring duty ratio corresponding with the practical aperture of the valve in preset duty ratio limit value table
Limit value, using the duty ratio limit value as the duty ratio limit value of the target valve.
7. valve control device according to claim 6, which is characterized in that further include:
Determination unit, for determining whether the engine is in halted state；
Cutting unit is used to then cut off the control signal of the target valve if it is determined that the engine is in halted state.
8. valve control device according to claim 7, which is characterized in that the determination unit, for according to throttle shape
The relative speed variation of state, the revolving speed of the engine and the engine determines whether the engine is in halted state.
9. valve control device according to claim 7, which is characterized in that further include:
Timing unit, for starting timing when determining that the engine is in halted state, when timing time reaches it is default when
Between when, cut off the control signal of target valve；
Wherein, if detecting engine start before timing time reaches preset time, cancel timing.
10. valve control device according to claim 8, which is characterized in that the determination unit, comprising:
First judging unit, for judging whether the throttle meets the first preset condition, the first preset condition table
Show throttle when an engine is stopped；
Second judgment unit, for judging whether the revolving speed of the engine meets the second preset condition, the second default item
Part indicates engine speed when an engine is stopped；
Third judging unit, for judging whether the relative speed variation of the engine meets third preset condition, the third
Preset condition indicates the relative speed variation of engine when an engine is stopped；
4th judging unit, it is pre- for first preset condition, second preset condition and the third ought to be met simultaneously
If when condition, determining that the engine is in halted state.
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|---|---|---|---|
| CN201811162961.7A CN109083755B (en) | 2018-09-30 | 2018-09-30 | Valve control method and device for engine |
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| CN201811162961.7A CN109083755B (en) | 2018-09-30 | 2018-09-30 | Valve control method and device for engine |
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| CN109083755B CN109083755B (en) | 2021-06-22 |
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| CN112610342A (en) * | 2020-12-15 | 2021-04-06 | 广西玉柴机器股份有限公司 | EGR valve control method for improving engine stop noise |
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