CN109611189A - A kind of control system and method for diesel engine - Google Patents
A kind of control system and method for diesel engine Download PDFInfo
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- CN109611189A CN109611189A CN201811440111.9A CN201811440111A CN109611189A CN 109611189 A CN109611189 A CN 109611189A CN 201811440111 A CN201811440111 A CN 201811440111A CN 109611189 A CN109611189 A CN 109611189A
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- diesel engine
- water temperature
- comparator
- torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
This application discloses a kind of control systems of diesel engine, including first comparator, second comparator, third comparator, with logic gate, NOT logic door, delayer, first selector, second selector, 4th comparator and electronic control unit, wherein, first comparator, second comparator is for judging water temperature and the first limit value, the size of second limit value, third comparator is used to judge the size of water temperature variation slope and water temperature variation slope limit value, by with logic gate, NOT logic door, delayer, first selector, second selector can provide different torque selections for different temperatures and temperature variations, smaller value therein is selected based on the 4th comparator, input to electronic control unit, electronic control unit can be made to realize the control to torsional moment of diesel engine based on water temperature and water temperature variation slope, so, it can It ensures the dynamic property of diesel engine, and can guarantee diesel engine from the damage of water temperature over-high.Disclosed herein as well is a kind of control methods.
Description
Technical field
This application involves the control systems and method of control field more particularly to a kind of diesel engine.
Background technique
Diesel engine namely diesel engine are able to extensively because power is big, the thermal efficiency is high in heavy vehicle and household vehicle
Application.However, cause machine oil that can not cool down when the water temperature over-high of diesel engine, so will lead to the cylinder cap of diesel engine, piston with
And the parts such as bearing shell local overheating, it will cause scuffing of cylinder bore and change watt when serious.
In order to protect diesel engine, an overheating protection plan based on water temperature can be generally provided in current electronic controlled diesel
Slightly.Specifically, the water temperature of diesel engine is monitored, when diesel engine water temperature increase to a certain extent, then be immediately performed diesel oil
Machine limits torque, and temperature is higher, and limitation torque is bigger, in this way, will lead to vehicle when environment temperature is higher, is easy to produce power
Insufficient operating condition.
Summary of the invention
In view of this, can be realized and be based on based on the control system this application provides a kind of control system of diesel engine
Water temperature and water temperature variation slope control the torque of diesel engine, and water temperature is avoided to increase the feelings for limiting the torque of diesel engine
Condition in this way, the dynamic property of diesel engine can be ensured, and can guarantee diesel engine from the damage of water temperature over-high.Accordingly, the application
Additionally provide a kind of control method of diesel engine.
The application first aspect provides a kind of control system of diesel engine, the control system include first comparator,
Second comparator, third comparator, compared with logic gate, NOT logic door, delayer, first selector, second selector, the 4th
Device and electronic control unit；
The first comparator is for the water temperature of the diesel engine to be compared with the first limit value, second comparator
For the water temperature of the diesel engine to be compared with the second limit value, the third comparator is used for the water temperature of the diesel engine
Variation slope is compared with water temperature variation slope limit value, the first comparator, second comparator and the third
The comparison result of comparator is input to described and logic gate；
It is described to be separately input into the delayer, the NOT logic door, the NOT logic door with logic gate output result
Output result be input to the first selector, the peak torque of the diesel engine is exported for controlling the first selector
Or the overheating protection torque of the diesel engine, the delayer, which is used for the basis output result determination with logic gate, is
No progress overheating protection delay, the output result of the delayer is input to the second selector, for controlling described second
Selector exports the peak torque of the diesel engine or the overheating protection torque of the diesel engine；
The output result of the first selector and the second selector is input to the 4th comparator, and the described 4th compares
Device be used for export the first selector and the second selector output result smaller value, the 4th comparator it is defeated
Result is input to the electronic control unit out, so that output result of the electronic control unit according to the 4th comparator
Control the torque of the diesel engine.
Optionally, the delayer is specifically used for:
If the output result with logic gate becomes 1 from 0, the delayer start-up study function, determination was carried out
Thermal protection delay.
Optionally, the first selector is specifically used for:
When the output result of the NOT logic door becomes 1 from 0, the overheating protection torque of the diesel engine is exported, otherwise
Export the peak torque of the diesel engine.
Optionally, the second selector is specifically used for:
If the delayer start-up study, exports the peak torque of the diesel engine during delay, in the non-delayed phase
Between export the overheating protection torque of the diesel engine；
If the inactive delay of delayer, exports the peak torque of the diesel engine.
Optionally, whether the water temperature that the first comparator is specifically used for the diesel engine is greater than or equal to the first limit
Value, if so, output result is 1；
Whether the water temperature that second comparator is specifically used for the diesel engine is less than or equal to the second limit value, if
Be then export result be 1；
Whether the water temperature variation slope that the third comparator is specifically used for the diesel engine is less than or equal to water temperature
Change slope limit value, if so, output result is 1.
Optionally, the electronic control unit is specifically used for:
The output torque of the diesel engine is adjusted according to the output result of the 4th comparator and torque gradient.
The application second aspect provides a kind of control method of diesel engine, applied to bavin described in the application first aspect
The control system of oil machine, which comprises
The water temperature and water temperature for obtaining diesel engine change slope；
According to the output torque of diesel engine described in the water temperature and water temperature variation slop control.
Optionally, the output torque packet of the diesel engine according to the water temperature and water temperature variation slop control
It includes:
If the water temperature of the diesel engine is greater than or equal to the first limit value, and is less than or equal to the second limit value and described
The water temperature variation slope of diesel engine is less than or equal to water temperature and changes slope limit value, then carries out overheat delay protection to diesel engine,
Maximum output torque during delay exports overheating protection torque in non-delayed period.
Optionally, the output torque packet of the diesel engine according to the water temperature and water temperature variation slop control
It includes:
If the water temperature of the diesel engine is greater than the second limit value and/or described less than the water temperature of the first limit value, the diesel engine
The water temperature variation slope of diesel engine is greater than water temperature and changes slope limit value, then controls diesel engine output overheating protection torque.
Optionally, the overheating protection torque is determined according to the water temperature of the diesel engine.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
The embodiment of the present application provides a kind of control system of diesel engine, which includes first comparator, second compares
Device, third comparator and logic gate, NOT logic door, delayer, first selector, second selector, the 4th comparator and electricity
Sub-control unit, wherein first comparator, the second comparator are used to judge the size of water temperature and the first limit value, the second limit value, the
Three comparators be used for judge water temperature variation slope and water temperature variation slope limit value size, by with logic gate, NOT logic door, prolong
When device, first selector, second selector different torque selections, base can be provided for different temperatures and temperature variations
Smaller value therein is selected in the 4th comparator, inputs to electronic control unit, electronic control unit can be made to be based on water temperature
And water temperature variation slope realizes the control to torsional moment of diesel engine, in this way, the dynamic property and bavin of diesel engine can be ensured
Damage of the oil machine from water temperature over-high.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, 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
Some embodiments of application without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of the control system of diesel engine provided by the embodiments of the present application；
Fig. 2 is a kind of flow chart of the control method of diesel engine provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
The description and claims of this application and term " first ", " second ", " third ", " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so that embodiments herein described herein for example can be to remove
Sequence other than those of illustrating or describe herein is implemented.In addition, term " includes " and " having " and theirs is any
Deformation, it is intended that cover it is non-exclusive include, for example, containing the process, method of a series of steps or units, system, production
Product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for this
A little process, methods, the other step or units of product or equipment inherently.
For the overheating protection strategy in the prior art based on water temperature when temperature increases to a certain extent, it is immediately performed bavin
Oil machine limits torque, leads to the technical issues of being easy to produce the operating condition being short of power, this application provides a kind of controls of diesel engine
System processed, since the short time raising of water temperature will not influence the reliability of diesel engine, can be in the overheat based on water temperature
Water temperature is introduced on Preservation tactics and changes slope, is monitored realization overheating protection by changing slope to water temperature and water temperature.
Specifically, the system include first comparator, the second comparator, third comparator, with logic gate, NOT logic door,
Delayer, first selector, second selector, the 4th comparator and electronic control unit, wherein first comparator, second
Comparator is used to judge the size of water temperature and the first limit value, the second limit value, third comparator for judge water temperature variation slope with
Water temperature changes the size of slope limit value, by can be with logic gate, NOT logic door, delayer, first selector, second selector
Different torque selections is provided for different temperatures and temperature variations, smaller value therein is selected based on the 4th comparator,
Electronic control unit is inputed to, electronic control unit can be made to be based on water temperature and water temperature variation slope realization to diesel engine torsion
The control of square, in this way, can ensure diesel engine dynamic property and diesel engine from water temperature over-high damage.
In order to enable the technical solution of the application it is clearer, it can be readily appreciated that below in conjunction with attached drawing to the application implement
The control system for the diesel engine that example provides is introduced.
The structural schematic diagram of the control system of diesel engine shown in Figure 1, the control system include first comparator 11,
Second comparator 12, third comparator 13 are selected with logic gate 20, NOT logic door 21, delayer 22, first selector 23, second
Select device 24, the 4th comparator 30 and electronic control unit 40；
Wherein, first comparator 11 is used to limit the water temperature of the diesel engine and the first limit value namely water temperature shown in FIG. 1
Value 1 is compared, and second comparator 12 is used for the water temperature of the diesel engine and the second limit value namely water temperature shown in FIG. 1
Limit value 2 is compared, and the third comparator 13 is used for the water temperature variation slope of the diesel engine and water temperature variation slope limit
Value is compared, and the comparison result of the first comparator 11, second comparator 12 and the third comparator 13 is defeated
Enter to described and logic gate 20；
It is described to be separately input into the delayer 22, the NOT logic door 21 with logic gate 20 output result, it is described non-
The output result of logic gate 21 is input to the first selector 23, exports the diesel oil for controlling the first selector 23
The overheating protection torque of the peak torque of machine or the diesel engine, the delayer 22 are used for according to described and logic gate 20
Output result determine whether to carry out overheating protection delay, the output result of the delayer 22 is input to the second selector
24, the peak torque of the diesel engine or the overheating protection of the diesel engine are exported for controlling the second selector 24
Torque；
The output result of the first selector 23 and the second selector 24 is input to the 4th comparator 30, and described
Four comparators 30 are used to export the smaller value of the output result of the first selector 23 and the second selector 24, and described the
The output result of four comparators 30 is input to the electronic control unit 40, so that the electronic control unit 40 is according to described
The output result of four comparators controls the torque of the diesel engine.
In the present embodiment, whether the water temperature that the first comparator 11 is specifically used for the diesel engine is greater than or waits
In the first limit value, if so, output result is 1；Second comparator 12 be specifically used for the diesel engine water temperature be
It is no to be less than or equal to the second limit value, if so, output result is 1；The 13 third comparators are specifically used for the diesel oil
Whether the water temperature variation slope of machine is less than or equal to water temperature variation slope limit value, if so, output result is 1.If being appreciated that
The water temperature of diesel engine is greater than or equal to the first limit value, and the water temperature for being less than or equal to the second limit value and diesel engine changes effect
Rate is less than or equal to water temperature and changes slope limit value, then first comparator 11, the second comparator 12 and third comparator 13 is defeated
Result is 1 out.
It should be noted that the first limit value is generally less than the second limit value, if water temperature is less than the first limit value, first comparator 11
Output result be 0, and the output result of the second comparator 12 be 1, if water temperature be greater than the second limit value, first comparator 11
Exporting result is 1, and the output result of the second comparator 12 is 0.
For with logic gate 20, when first comparator 11, the output result of the second comparator 12 and third comparator 13
When being 1, the output result with logic gate 20 is 1, if first comparator 11, the second comparator 12 or third comparator 13
In any one or more output results be 0, then with the output result of logic gate 20 be 0.
In the above-described embodiments, when delayer 22 captures the rising edge with the output signal of logic gate, start-up study
Function.That is, the delayer start-up study function is determined and is carried out if the output result with logic gate becomes 1 from 0
Overheating protection delay.Overheating protection delay is carried out i.e. during delay to diesel engine, still exports the peak torque of diesel engine, and
The overheating protection torque of non-delayed period output diesel engine.Wherein, overheating protection torque, which refers to, carries out overheating protection to diesel engine
When, the torque after torque limit is executed to diesel engine.
As shown in Figure 1, signal is divided into two paths, and a paths include NOT logic with after 20 output signal of logic gate
Door 21 and first selector 23 state for convenience, are denoted as path 1；One paths include delayer 22 and second selector 24,
In order to facilitate statement, it is denoted as path 2.
For path 1, when the output result of the NOT logic door 21 becomes 1 from 0, first selector 23 exports the bavin
The overheating protection torque of oil machine, otherwise exports the peak torque of the diesel engine.
For path 2, when 22 start-up study of delayer, then described in the second selector 24 exports during delay
The peak torque of diesel engine exports the overheating protection torque of the diesel engine in non-delayed period；If the delayer 22 does not open
Dynamic delay, then the second selector 24 exports the peak torque of the diesel engine.
Based on this, when diesel engine water temperature be greater than or equal to the first limit value, and be less than or equal to the second limit value and bavin
Oil machine water temperature variation efficiency be less than or equal to water temperature variation slope limit value when, first comparator 11, the second comparator 12 and
The output result of third comparator 13 is 1, is so 1 with the output result of logic gate 20, and it is 0 that NOT logic door, which exports result,
First selector 23 export diesel engine peak torque, i.e., path 1 export diesel engine peak torque, and due to logic 20
Exporting result becomes 1 from 0, and 22 start-up study of delayer, then second selector 24 exports the diesel engine most during delay
Large torque exports the overheating protection torque of the diesel engine in non-delayed period, i.e. path 2 exports diesel engine during delay
Peak torque, in the overheating protection torque of output of non-delayed period diesel engine.And the 4th comparator 30 is defeated to path 1 and path 2
Result out is compared, and the minimum of the two is exported, in this way, the 4th comparator 30 exports the maximum of diesel engine during delay
Torque, in the overheating protection torque of output of non-delayed period diesel engine.
When the water temperature of diesel engine is less than the first limit value, the water temperature for being perhaps greater than the second limit value or diesel engine changes efficiency
When changing slope limit value greater than water temperature, the output result of first comparator 11, the second comparator 12 and third comparator 13 is extremely
Rare 1 is 0, in this way, the output result with logic gate 20 is 0, NOT logic door, which exports result, becomes 1 from 0, triggers first choice
Device 23 exports the overheating protection torque of diesel engine, i.e. the overheating protection torque of the output of path 1 diesel engine, and delayer 22 will not open
Dynamic delay, second selector 24 export the peak torque of diesel engine, the i.e. peak torque of the output of path 2 diesel engine.And the 4th ratio
Compare the peak torque of diesel engine and the overheating protection torque of diesel engine compared with device 30, selects smaller value therein, generally overheat
Torque is protected, exports electron control unit 40, electronic control unit 40 is i.e. according to the output result of the 4th comparator to diesel oil
The torque of machine is controlled, such as enabling diesel engine output torque is overheating protection torque.
Electronic control unit 40 specifically can adjust the diesel oil with the output result of the 4th comparator and torque gradient
The output torque of machine.A torque gradient is provided respectively with torque decline as shown in Figure 1, rising for torque, is denoted as Krise
And Kfall adjusts the torque of diesel engine according to Kfall if the output result of the 4th comparator is less than current torque, if the 4th
The output result of comparator is greater than current torque, then according to the torque of Krise adjustment diesel engine, wherein Krise and Kfall can
To be configured based on experience value.Torsional moment of diesel engine is modulated based on the RAMP, may be implemented so that diesel engine condition transition is steady.
In the above-described embodiments, the delay time of delayer can be configured according to demand, such as can be set to
60s, the embodiment of the present application are not construed as limiting this.It should also be noted that, overheating protection torque changes with the variation of temperature.
Such as water temperature it is lower when, overheating protection torque is higher, in this case, even if diesel engine output torque be overheating protection turn round
Square, overheating protection torque is higher, will not generate and be short of power.And water temperature is higher, when being such as higher than the second limit value, shows diesel engine
Water temperature it is high to that may be impacted to the reliability of diesel engine, overheating protection torque is lower, so that the mistake of diesel engine
Thermal protection can work in time, protect diesel engine damage.
If the water temperature of diesel engine is between the first limit value and the second limit value, and water temperature variation slope changes greater than water temperature
When slope threshold value, then show that the radiator leak of vehicle or fan have occurred catastrophe failure or other reasons are leading to water temperature not just
Normal quick variation carries out overheating protection limitation to diesel engine based on overheating protection torque at this time in order to protect diesel engine.
From the foregoing, it will be observed that the embodiment of the present application provides a kind of control system of diesel engine, which includes the first ratio
Compared with device, the second comparator, third comparator, with logic gate, NOT logic door, delayer, first selector, second selector, the
Four comparators and electronic control unit, wherein first comparator, the second comparator are for judging water temperature and the first limit value, the
The size of two limit values, third comparator be used for judge water temperature variation slope and water temperature variation slope limit value size, by with patrol
Collecting door, NOT logic door, delayer, first selector, second selector can provide for different temperatures and temperature variations
Different torque selections, selects smaller value therein based on the 4th comparator, inputs to electronic control unit, can make electronics
Control unit realizes the control to torsional moment of diesel engine based on water temperature and water temperature variation slope, in this way, diesel engine can be ensured
Dynamic property, and can guarantee diesel engine from the damage of water temperature over-high.
The above are a kind of control systems of diesel engine provided by the embodiments of the present application, are based on this, the embodiment of the present application also mentions
The control method for having supplied a kind of diesel engine, below in conjunction with attached drawing, to the control method of diesel engine provided by the embodiments of the present application
It is introduced.
The flow chart of the control method of diesel engine shown in Figure 2 is applied to diesel engine provided by the embodiments of the present application
Control system, this method comprises:
S201: the water temperature and water temperature variation slope of diesel engine are obtained.
Wherein, the water temperature of diesel engine can be obtained by temperature sensor measurement, in this way, the control system of diesel engine can be with
The water temperature of diesel engine is obtained from temperature sensor.After getting current water temperature, the water temperature for being also based on previous moment is calculated
Water temperature changes slope.
S202: according to the output torque of diesel engine described in the water temperature and water temperature variation slop control.
For diesel engine, the short time of water temperature, which increases, will not influence its reliability, therefore, can be in the base of water temperature
Water temperature variation slope is introduced on plinth and carries out overheating protection to it, i.e., according to the torsion of its output of water temperature and water temperature variation slop control
Square is then immediately performed the case where limitation torque causes vehicle to be short of power in this way, can increase to avoid water temperature one, and ensures
The reliability of diesel engine.
In specific implementation, the output torque of the diesel engine according to the water temperature and water temperature variation slop control
It is specifically as follows, if the water temperature of the diesel engine is greater than or equal to the first limit value, and is less than or equal to the second limit value, Yi Jisuo
The water temperature variation slope for stating diesel engine is less than or equal to water temperature and changes slope limit value, then carries out overheat delay protection to diesel engine,
The maximum output torque during delay exports overheating protection torque in non-delayed period.
Further, if the water temperature of the diesel engine is greater than the second limit value less than the water temperature of the first limit value, the diesel engine
And/or the water temperature variation slope of the diesel engine is greater than water temperature and changes slope limit value, then controls diesel engine output overheating protection and turn round
Square.
Wherein, the overheating protection torque is related to water temperature, can be determined according to the water temperature according to the diesel engine.
When water temperature is relatively high, overheating protection torque is lower, and when water temperature is relatively low, then overheating protection torque is relatively high.
In order to make it easy to understand, being illustrated below with reference to control method of the specific example to diesel engine.
For the diesel engine of a certain model of vehicle, the first limit value is 100 degrees Celsius (DEG C), and the second limit value is 105 DEG C, temperature
Variation slope threshold value is 10 DEG C/s, if Current Temperatures are 95 DEG C, since it is less than the first limit value, the control system control of diesel engine
Diesel engine processed exports overheating protection torque, and 95 DEG C of corresponding overheating protection torques are relatively high, and it is dynamic not will lead to vehicle generally
Power is insufficient, if Current Temperatures are 102 DEG C, temperature change slope is 5 DEG C/s, then since temperature is between 100 DEG C and 105 DEG C,
And temperature change slope is less than temperature change slope threshold value, the control system of diesel engine will carry out overheat delay protection, be delayed
Period still maximum output torque then exports overheating protection torque in non-delayed period, ensures the dynamic property of diesel engine, and guarantees bavin
Damage of the oil machine from water temperature over-high.If temperature change slope is 15 DEG C/s, since temperature change slope is greater than temperature change
The control system of slope threshold value, diesel engine will export overheating protection torque, so that diesel engine is from high temperature injury.If temperature is
110 DEG C, then since temperature is greater than the second limit value, the control system of diesel engine will export overheating protection torque, and protect it from damage.
From the foregoing, it will be observed that the embodiment of the present application provides a kind of control method of diesel engine, this method utilizes the control of diesel engine
System processed obtains the water temperature of diesel oil and water temperature changes slope, the torsion based on water temperature variation and water temperature variation slope to diesel engine
Square is controlled, and is based only upon the overheating protection strategy of water temperature compared to the prior art, can be increased to certain journey to avoid in temperature
The generation that is short of power caused by overheating protection is carried out when spending immediately, in this way, the dynamic property and bavin of diesel engine can be ensured
Damage of the oil machine from water temperature over-high.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or unit
Letter connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of control system of diesel engine, which is characterized in that the control system include first comparator, the second comparator,
Third comparator and logic gate, NOT logic door, delayer, first selector, second selector, the 4th comparator and electronics
Control unit；
For the water temperature of the diesel engine to be compared with the first limit value, second comparator is used for the first comparator
The water temperature of the diesel engine is compared with the second limit value, the third comparator is used to change the water temperature of the diesel engine
Slope is compared with water temperature variation slope limit value, and the first comparator, second comparator and the third compare
The comparison result of device is input to described and logic gate；
It is described to be separately input into the delayer, the NOT logic door with logic gate output result, the NOT logic door it is defeated
Result is input to the first selector out, and peak torque or the institute of the diesel engine are exported for controlling the first selector
State the overheating protection torque of the diesel engine, the delayer be used to be determined whether according to the output result with logic gate into
The delay of row overheating protection, the output result of the delayer are input to the second selector, for controlling second selection
Device exports the peak torque of the diesel engine or the overheating protection torque of the diesel engine；
The output result of the first selector and the second selector is input to the 4th comparator, and the 4th comparator is used
In the smaller value for the output result for exporting the first selector and the second selector, the output knot of the 4th comparator
Fruit is input to the electronic control unit, so that the electronic control unit is controlled according to the output result of the 4th comparator
The torque of the diesel engine.
2. system according to claim 1, which is characterized in that the delayer is specifically used for:
If the output result with logic gate becomes 1 from 0, the delayer start-up study function, determination carries out overheat guarantor
Shield delay.
3. system according to claim 1, which is characterized in that the first selector is specifically used for:
When the output result of the NOT logic door becomes 1 from 0, the overheating protection torque of the diesel engine is exported, is otherwise exported
The peak torque of the diesel engine.
4. system according to claim 1, which is characterized in that the second selector is specifically used for:
If the delayer start-up study, exports the peak torque of the diesel engine during delay, defeated in non-delayed period
The overheating protection torque of the diesel engine out；
If the inactive delay of delayer, exports the peak torque of the diesel engine.
5. system according to claim 1, which is characterized in that the first comparator is specifically used for the diesel engine
Water temperature whether be greater than or equal to the first limit value, if so, output result be 1；
Whether the water temperature that second comparator is specifically used for the diesel engine is less than or equal to the second limit value, if so,
Exporting result is 1；
Whether the water temperature variation slope that the third comparator is specifically used for the diesel engine is less than or equal to water temperature variation
Slope limit value, if so, output result is 1.
6. system according to any one of claims 1 to 4, which is characterized in that the electronic control unit is specifically used for:
The output torque of the diesel engine is adjusted according to the output result of the 4th comparator and torque gradient.
7. a kind of control method of diesel engine, which is characterized in that applied to diesel engine described in claim 1 to 6 any one
Control system, which comprises
The water temperature and water temperature for obtaining diesel engine change slope；
According to the output torque of diesel engine described in the water temperature and water temperature variation slop control.
8. the method according to the description of claim 7 is characterized in that described change slope according to the water temperature and the water temperature
The output torque for controlling the diesel engine includes:
If the water temperature of the diesel engine is greater than or equal to the first limit value, and is less than or equal to the second limit value and the diesel oil
The water temperature variation slope of machine is less than or equal to water temperature and changes slope limit value, then carries out overheat delay protection to diesel engine, be delayed
Period maximum output torque exports overheating protection torque in non-delayed period.
9. the method according to the description of claim 7 is characterized in that described change slope according to the water temperature and the water temperature
The output torque for controlling the diesel engine includes:
If the water temperature of the diesel engine is greater than the second limit value and/or the diesel oil less than the water temperature of the first limit value, the diesel engine
The water temperature variation slope of machine is greater than water temperature and changes slope limit value, then controls diesel engine output overheating protection torque.
10. method according to claim 8 or claim 9, which is characterized in that the overheating protection torque is according to the diesel engine
Water temperature determines.
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