CN108708796A - A kind of Pressure Limiter of High-pressure Common Rail System control method - Google Patents
A kind of Pressure Limiter of High-pressure Common Rail System control method Download PDFInfo
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- CN108708796A CN108708796A CN201810503665.2A CN201810503665A CN108708796A CN 108708796 A CN108708796 A CN 108708796A CN 201810503665 A CN201810503665 A CN 201810503665A CN 108708796 A CN108708796 A CN 108708796A
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- pressure
- limiting valve
- pressure limiting
- rail
- value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3827—Common rail control systems for diesel engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
- F02D41/3872—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves characterised by leakage flow in injectors
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a kind of Pressure Limiter of High-pressure Common Rail System control method, by monitoring whether rail pressure value judges pressure limiting valve state more than rail pressure upper limit threshold and in conjunction with the rail pressure variable quantity and speed conditions calculated according to the rail pressure value monitored；When pressure limiting valve positive closing condition meets, pressure limiting valve actively closes control and enables；When pressure limiting valve impact condition meets, pressure limiting valve is actively opened control and is enabled；When response time alert if meets, corresponding warning message is set；When pressure limiting valve rejection condition meets, the control of pressure limiting valve active suppression enables；The pressure limiting valve state demarcation is initialization, closes, test, opens, impact, inhibits 6 kinds of states.Vehicle caused by the invention avoids being opened due to pressure limiting valve is short of power for a long time, the danger of engine combustion and deterioration of emission, even engine misses.
Description
Technical field
The present invention relates to the control strategy of Electrocontrolled high-pressure common rail diesel engine and methods, are especially used for high-pressure common rail fuel oil and spray
Penetrate the control method of the pressure limiting valve in system.
Background technology
The aggravation of environmental pollution and the exposed day by day of energy crisis, emission regulation is increasingly harsh, promotes electronic controlled diesel
Development.High pressure co-rail system becomes future diesel machine Fuel System due to accurate, the flexible modulation of injection pressure and fuel injection characteristic
The developing direction of system.When an electronically or mechanically failure occurs for high pressure co-rail system, common rail pipe intermediate fuel oil pressure may be more than height
The Maximum safe pressure that pressure each component of common rail system can be born causes corresponding component impaired, therefore, is mounted on common rail pipe
Pressure limiting valve needs actively or passively to open, and rail pressure is made to stablize in lower pressure, while using corresponding safeguard measure, to high pressure
Common rail system and diesel engine play the role of safeguard protection.Since pressure limiting valve is mechanical valve, itself does not connect with any electrical equipment,
So whether cannot open indicating it by electrical equipment or failure, need accurately to be judged using effective control method.
The existing patent in terms of Pressure Limiter of High-pressure Common Rail System is mostly to be directed to pressure limiting valve structure and fault diagnosis side
Face.Such as：" a kind of engine common rail fuel injection system is limited the patent that grant number is CN201443451U with common rail pressure
Valve " proposes a kind of common rail pressure limiting valve of new construction, but without reference to pressure limiting valve open and close the judgment method of state with
And the control method after pressure limiting valve unlatching.For another example：The patent of Publication No. CN101349230A in common rail fuel " for supplying
The control method of excess pressure valve in system " describes a kind of side carrying out fault diagnosis to common rail excess pressure valve (namely pressure limiting valve)
Method.During diagnosis, by the way that the fuel pressure inside the flow of high-pressure pump and/or common rail is compared with corresponding threshold value
To diagnose whether pressure limiting valve breaks down.But the method how patent is handled after being opened without reference to pressure limiting valve.And
And the patent is mainly the failure for judging whether excess pressure valve can occur to open and cannot open, and does not mention and opening pressure limiting valve
Open the judgement of state or closed state.Even if the patent that pressure limiting valve is turned on and off state judging method is related to, such as：It authorizes
It number describes for the patent " control method of common rail pressure limiting valve " of CN103573449B and a kind of state is turned on and off to pressure limiting valve
The method of judgement, the solution have the drawback that：
1) " if the accumulated value for recurring the number that rail pressure drop rate opens threshold value more than preset pressure limiting valve is more than or equal to
First counter threshold then confirms that pressure limiting valve is opened ".The pressure limiting valve structure of different company has larger difference, is such as lived using two-stage
Plug structure pressure limiting valve or variable cross-section single stage piston structure pressure limiting valve, rail pressure variable quantity has larger difference after this causes pressure limiting valve to be opened
It is different, and different periods rail pressure variable quantity also has larger difference in same pressure limiting valve opening process.It is accurate in order to ensure, it needs to use
Smaller pressure limiting valve opens threshold value, and the first larger counter threshold, this will cause to open judgement lag.
2) due to being only used as the condition for judging whether pressure limiting valve is opened by rail pressure drop rate, when serious leak occurs for system
Or fuel injector it is stuck when, rail pressure drop rate may be met reach preset pressure limiting valve and open threshold value, cause erroneous judgement without and
When take control measure, and then lead to energy loss.
3) due to being only used as the condition for judging whether pressure limiting valve is opened by rail pressure drop rate, high-pressure oil pump oil-feeding control is adopted
When with open type fuel metering valve, if electronic control unit breaks down and restarts when high engine speeds operate, fuel injector will stop-spraying,
Fuel metering valve standard-sized sheet causes high-pressure oil pump by maximum fuel feeding, and supply capability is strong when high engine speeds operating, and fuel feeding is uprushed, sprayed
Oily hang-up causes pressure limiting valve to be opened, and rail pressure signal, and electronic control unit abnormal restarting are unable to monitor in electronic control unit restarting process
Time is shorter, although stop-spraying causes engine speed to decline, rail pressure maintains pressure limiting valve to open still greater than minimum limping pressure
State, monitoring rail pressure variable quantity may not reach preset pressure limiting valve unlatching threshold value after electronic control unit is restarted, and cause without just
True identification pressure limiting valve is opened and erroneous judgement (such as recovery oil spout etc.) occurs, and does not take control measure in time, leads to vehicle power
Property and economy be deteriorated.
4) due to being only used as the condition for judging whether pressure limiting valve is opened by rail pressure drop rate, when event occurs in rail pressure sensor
When barrier, due to cannot normally monitor rail pressure signal, cause to open and judge by accident without correctly identification pressure limiting valve.
5) pressure limiting valve only realizes that passive open monitors, and is not implemented and actively opens control, when rail pressure sensor failure or system
Mechanical breakdown leads to rail pressure superelevation, and due to not taking impulsive control, high-pressure oil pump normal fuel injection, fuel injector normally spray at this time
Oil causes rail pressure not have the duration of opens voluntarily may be longer higher than rail pressure upper limit threshold and pressure limiting valve, system is caused to be pacified
Full property is poor.
6) pressure limiting valve opening times, accumulative opening time are not recorded and is analyzed, and pressure limiting valve opening times are more than
Certain threshold value or accumulative opening time are more than after a certain period of time that pressure limiting valve opening pressure will increase or reduce, and increase high-pressure common rail
The risk of permanent fault occurs for system.
7) the response time of pressure limiting valve is not recorded, analyzed and is controlled.Response time is pressure limiting valve peace
One of the key index of full performance, such as when pressure limiting valve clamping stagnation, response time will increase, and increase high pressure co-rail system
The risk of permanent fault.
Invention content
The purpose of the present invention is to provide a kind of Pressure Limiter of High-pressure Common Rail System control methods, by being closed to pressure limiting valve,
The quick and precisely judgements of different conditions such as unlatching, test, impact and effective control, play high pressure co-rail system and diesel engine
Safeguard protection acts on；For the pressure limiting valve after unlatching, it can realize fast and reliable closing under certain conditions, make common rail
Fuel system restores normal operation in the shortest possible time, to make engine recovery reach normal dynamic property, economy
Property and emission request, avoid vehicle prolonged cyllopodia traveling；For the pressure limiting valve of closing, when rail pressure sensor failure, system
Under mechanical breakdown or certain condition, pressure limiting valve is quickly washed open, reduce the time that system is in superelevation rail pressure, lifting system safety
Property；Pressure limiting valve opening times, accumulative opening time and response time are calculated, counted, it can be when transfiniting, in advance
Early warning, or enter holddown to reduce the risk that permanent fault occurs for high pressure co-rail system；For high-pressure oil pump fuel feeding control
System can quick and precisely be judged pressure limiting valve state, be taken control measure, avoided due to pressure limiting using open type fuel metering valve
Vehicle caused by valve is opened is short of power for a long time, the danger of engine combustion and deterioration of emission, even engine misses.
In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is：
A kind of Pressure Limiter of High-pressure Common Rail System control method, which is characterized in that by monitoring whether rail pressure value is more than rail pressure
Upper limit threshold simultaneously judges pressure limiting valve state in conjunction with the rail pressure variable quantity and speed conditions calculated according to the rail pressure value that is monitored；
When pressure limiting valve positive closing condition meets, pressure limiting valve actively closes control and enables；When pressure limiting valve impact condition meets, pressure limiting
Valve is actively opened control and is enabled；When response time alert if meets, corresponding warning message is set；When pressure limiting valve inhibits
When condition meets, the control of pressure limiting valve active suppression enables；The pressure limiting valve state demarcation be initialization, close, test, open,
Impact inhibits 6 kinds of states.
In a preferred embodiment of the invention, the rail pressure value monitoring method is by acquiring rail pressure signal, carrying out
Data judge that post filtering obtains rail pressure value；The computational methods of the rail pressure variable quantity be current rail pressure value subtract last time rail pressure be worth
To rail pressure variable quantity.
In a preferred embodiment of the invention, the step of rail pressure value and rail pressure variable quantity calculate is as follows：
Rail pressure signal is acquired first；
Then pressure sensor failure judgement is carried out to sampled value and reasonability judges, including pressure sensor output continues
A period of time exceeds normal range (NR)；Output valve is in TV(number of fuel feeding interval * times being calculated according to rotating speed) sampled value in the time
Variable quantity is consistently less than Δ Plimit；Sampled value variable quantity judges maximum value Δ P more than rail pressure reasonability in unit intervalmax。
If data judge exception and when anomalous counts do not reach threshold value, if last time sampled value is normal, last time sampled value is used；Such as
Fruit last time sampled value is abnormal, then uses last time rail pressure peak value.If anomalous counts reach threshold value, failure determines, using accordingly replacing
It is determined for scheme and substitutes rail pressure.And it is sequentially stored into data queue；
Then data queue sample value is carried out being maximized operation and obtains rail pressure maximum value PmaxT；；
Then time constant filter is determined：PmaxTRail pressure value P after being filtered more than last timelastWhen, time constant filter is set to
T10；PlastWith PmaxTDifference be less than threshold pressure differential Δ PTWhen, time constant filter is set to T11, otherwise time constant filter be set to
T12；Threshold pressure differential calculates according to the following formula：
Δ V=(1+ θ) q
Then to PmaxTCurrent rail pressure value is obtained using filtering algorithm：Filtering algorithm is as follows：
yk=α yk-1+(1-α)·xk-1
Finally, current rail pressure value subtracts last time rail pressure and is worth to rail pressure variable quantity.
In a preferred embodiment of the invention, the pressure limiting valve positive closing condition is specially：Car key switchs
In power-up state, and engine speed is more than rotary speed threshold value, and engine is in zero oil mass spray regime, and is sensed without rail pressure
Device failure, and pressure limiting valve positive closing Sofe Switch is set as true, then judgement meets pressure limiting valve positive closing condition, otherwise judges not
Meet.
In a preferred embodiment of the invention, the pressure limiting valve impact condition is specially：The pressure limiting valve superelevation duration
THInterior pressure limiting valve, which is opened, judges that unsuccessful and rotating speed is more than pressure limiting valve and closes maximum speed threshold value, then judgement meets pressure limiting valve impact
Condition, otherwise judgement are unsatisfactory for.
In a preferred embodiment of the invention, the response time alert if is specially：If operating lag
Time is more than response time alarm threshold value, then judgement meets alert if, and otherwise judgement is unsatisfactory for.
In a preferred embodiment of the invention, the pressure limiting valve rejection condition is specially：When pressure limiting valve opening times
Reach maximum times threshold value or the accumulative opening time reaches maximum opening time threshold value or response time reaches operating lag
When time inhibits threshold value, then judgement meets pressure limiting valve rejection condition, and otherwise judgement is unsatisfactory for.
In a preferred embodiment of the invention, the specific steps of the control method of Pressure Limiter of High-pressure Common Rail System are such as
Under：
A. the step of rail pressure and rail pressure variable quantity calculate：Rail pressure signal is acquired, data is carried out and judges that post filtering obtains rail pressure
Value, current rail pressure value subtract last time rail pressure and are worth to rail pressure variable quantity；
B. the step of pressure limiting valve is opened is judged in test mode：By the rail pressure variable quantity being calculated and preset pressure limiting valve
Starting differential pressure threshold value is compared, to judge whether pressure limiting valve is opened；
C. init state：For car key switch after power-up state, pressure limiting valve monitoring state enters init state,
Pressure limiting valve relevant control initializes.Judge whether to meet pressure limiting valve abnormal start-up test condition, if satisfied, then judging at pressure limiting valve
In open state, step E is executed；Otherwise judgement pressure limiting valve is closed, and executes step D；
D. closed state：Restore high-pressure oil pump fuel feeding and fuel injector oil spout, and target track is flattened and is surely transitioned into currently
The calculated phase sets rail pressure value to system automatically under operating mode, and system is allowed to restore normal operation；Judge whether that meeting pressure limiting valve opens survey
Strip part executes step F if satisfied, then pressure limiting valve enters test mode；When rail pressure sensor failure, pressure limiting valve enters punching
State is hit, step G is executed；
E. open state：It adds up total time to pressure limiting valve opening times and unlatching；Into rail pressure limping pattern, and limit
Engine power processed can limit engine speed simultaneously；When rotating speed, which is less than or equal to pressure limiting valve, closes maximum speed threshold value, judgement
Pressure limiting valve is closed, and executes step D；When pressure limiting valve rejection condition meets, pressure limiting valve enters holddown, executes step
Rapid H；When pressure limiting valve positive closing condition meets, step I is executed；
F. test mode：It executes step m and calculates response time；When response time alert if meets, if
Set corresponding warning message；When response time rejection condition meets, step H is executed；It is closed most when rotating speed is less than pressure limiting valve
When high rotary speed threshold value, judgement pressure limiting valve is closed, and executes step D；When step B judges that pressure limiting valve is in open state,
Execute step E；When pressure limiting valve impact condition meets, pressure limiting valve enters impact conditions, executes step G；
G. impact conditions：Cumulative number of shocks, calculates the impact duration；High-pressure oil pump maximum capacity fuel feeding, while oil spout
Device stops oil spout or fuel injection pulsewidth is limited in pressure limiting valve impact pulse width threshold to reach rapid pressure and wash pressure limiting valve open；If turning
Speed is less than pressure limiting valve and closes maximum speed threshold value, then judges that pressure limiting valve is closed, and executes step D；When pressure limiting valve impacts
When unlocking condition meets, then judges that pressure limiting valve is in open state, execute step E；When pressure limiting valve shock-testing condition meets,
Then pressure limiting valve enters test mode, executes step F；When pressure limiting valve rejection condition meets, then pressure limiting valve enters holddown,
Execute step H；
H. holddown：High-pressure oil pump fuel cut-off, fuel injector stops oil spout until engine is shut down；
I. the step of pressure limiting valve positive closing：When pressure limiting valve positive closing condition meets, high-pressure oil pump fuel cut-off, spray
Oily device stops oil spout, and the rail pressure variable quantity being calculated is closed threshold pressure differential with preset pressure limiting valve to be compared, to judge
Whether pressure limiting valve closes, if judging, pressure limiting valve is closed, and thens follow the steps D, no to then follow the steps J；
J. judge pressure limiting valve whether occur can not closing fault the step of：If rail pressure goes straight down to zero, or from satisfaction
In the given time period counted when pressure limiting valve positive closing condition, it can not all judge that pressure limiting valve is closed always, then judge pressure limiting valve
Can not closing fault, execute step H, it is no to then follow the steps I.
K. the step of propagation delay time calculates：Until rail pressure sensor collects fuel pressure at the time of unlatching from pressure limiting valve
Power changes the period until the moment.
L. the step of response time calculates：Calculate meet pressure limiting valve open test condition after enter test mode when
Period until quarter at the time of step B judgement pressure limiting valves are in open state, time period subtract the biography that step K is calculated
Broadcasting delay time meets with a response delay time；If not judging pressure limiting valve unlatching or rail pressure sensor failure, response time
It is 0.
In a preferred embodiment of the invention, judge whether pressure limiting valve is opened using three kinds of modes in the step B：
Method one：Three sections of rail pressure variable quantity judgements：In pressure limiting valve superelevation duration THIn time, rail pressure variable quantity g1It is less than
ΔP1(threshold pressure differential 1) stablizes duration T in pressure limiting valveSIn time, second segment rail pressure variable quantity g2Less than Δ P2(threshold pressure differential
, and third section rail pressure variable quantity g 2)3Less than Δ P3When (threshold pressure differential 3), judgement pressure limiting valve open, otherwise this judgement not at
Work(；
Method two：Two sections of rail pressure variable quantity judgements：In THIn time, rail pressure variable quantity g1Less than Δ P1, within the TS times,
Rail pressure variable quantity is added up, if rail pressure variable quantity accumulated value gsLess than rail pressure accumulated change amount Δ PA, then judge that pressure limiting valve is opened,
Otherwise this judgement is unsuccessful；
Method three：Mean value judges：In THIn time, rail pressure variable quantity g1Less than Δ P1, in TSIn time, method one and side
Method two is unsatisfactory for, and is averaged after accumulating n times to rail pressure, if average value suitable with rail pressure default value (i.e. average value and rail pressure
Default value is in certain deviation range), then judge that pressure limiting valve is opened, otherwise this judgement is unsuccessful.
In a preferred embodiment of the invention, in the step C, the pressure limiting valve abnormal start-up test condition is specific
For：When high-pressure oil pump oil-feeding control uses open type fuel metering valve, if engine speed is more than or equal to pressure limiting valve, unlatching is minimum
Rotary speed threshold value then judges that pressure limiting valve is in open state；If pressure limiting valve opens duration T after the power is turned onoInterior, engine speed is always
Minimum speed threshold value is opened less than pressure limiting valve, then judges that pressure limiting valve is closed.High-pressure oil pump oil-feeding control is using other
When mode, judgement pressure limiting valve is closed；It is high-pressure oil pump maximum fuel feeding, spray that the pressure limiting valve, which opens minimum speed threshold value,
When oily device maximum oil spout, the minimum speed of pressure limiting valve unlatching can be reached.
In a preferred embodiment of the invention, in the step D, it is high that the pressure limiting valve, which closes maximum speed threshold value,
When pressure oil pump maximum fuel feeding, fuel injector stop-spraying, the maximum speed of pressure limiting valve closing can be reached.
In a preferred embodiment of the invention, in the step D, the recovery high-pressure oil pump fuel feeding is to pass through adjusting
What high-pressure oil pump fuel metering valve drove duty ratio, or the energization moment of change high-pressure oil pump solenoid valve to realize.
In a preferred embodiment of the invention, in the step D, the recovery fuel injector oil spout is sprayed by changing
Energization moment of oily device solenoid valve, or distributive value is set as the phase and sets distributive value and realizes.
In a preferred embodiment of the invention, in the step D, the pressure limiting valve opens test condition and is specially：
If the duration that rail pressure is more than pressure limiting valve opening pressure threshold value is more than the pressure limiting valve unit monitoring duration and rotating speed is closed more than pressure limiting valve
Maximum speed threshold value is closed, then judgement meets pressure limiting valve unlatching test condition, and otherwise judgement is unsatisfactory for.
In a preferred embodiment of the invention, in the step E, rail pressure limping pattern, i.e., rail pressure control is by closed loop
Control becomes opened loop control, and high-pressure oil pump limping fuel delivery is according to current working (rotating speed, distributive value) by looking into limping fuel feeding
Scale obtains.High-pressure oil pump limping fuel delivery is between minimum limping fuel delivery and maximum limping fuel delivery.
In a preferred embodiment of the invention, in the step E, the limitation engine power is sprayed by limiting
The maximum distributive value of oily device or the output torque for limiting engine.
In a preferred embodiment of the invention, in the step F, the response time rejection condition is specific
For：Threshold value, judgement is inhibited to meet rejection condition if response time is more than response time, otherwise judgement is unsatisfactory for.
In a preferred embodiment of the invention, in the step G, the high-pressure oil pump maximum capacity fuel feeding is to pass through
High-pressure oil pump fuel metering valve driving duty ratio is adjusted immediately and arrives fuel feeding maximum rating, or changes high-pressure oil pump solenoid valve
The moment is powered to realizing.
In a preferred embodiment of the invention, in the step G, the fuel injector, which stops oil spout, to be sprayed by changing
The energization moment of oily device solenoid valve either forbids fuel injector magnetic system to work or distributive value is set as zero to realize.
In a preferred embodiment of the invention, in the step G, the duration is impacted in the calculating, specially：Just into
When entering impact conditions, the impact duration is assigned a value of 0, then after time interval Tp, an impact duration cumulative step value
Tp。
In a preferred embodiment of the invention, in the step G, the pressure limiting valve impact unlocking condition is specially：
If rail pressure sensor failure and rotating speed are more than or equal to, pressure limiting valve opens minimum speed threshold value and the impact duration rushes more than pressure limiting valve
Duration threshold value is hit, then judges that pressure limiting valve meets unlocking condition, otherwise judgement is unsatisfactory for.
In a preferred embodiment of the invention, in the step G, the pressure limiting valve shock-testing condition is specially：
If rail pressure sensor fault-free and maximum impact number are not up to and rotating speed is more than pressure limiting valve and closes maximum speed threshold value and impact
After duration is more than the pressure limiting valve impact duration, then judge that pressure limiting valve meets test condition, otherwise judgement is unsatisfactory for.
In a preferred embodiment of the invention, in the step H, the high-pressure oil pump fuel cut-off is by by mesh
Mark rail pressure immediately becomes 0, or high-pressure oil pump fuel metering valve driving duty ratio adjusted immediately and arrives fuel feeding minimum state or not
Oil condition either changes energization moment of high-pressure oil pump solenoid valve or forbids high-pressure oil pump electromagnetic valve work to realize；
In a preferred embodiment of the invention, in the step I, judge that the method whether pressure limiting valve closes is：If
The accumulated value for recurring number of the rail pressure change rate less than preset pressure limiting valve closing threshold value and more than or equal to 0 is more than or equal to limit
Pressure valve closes counter threshold, then confirms that pressure limiting valve is turned off.It is to be closed according to rail pressure to look into pressure limiting valve that pressure limiting valve, which closes threshold value,
Threshold value table obtains.
In a preferred embodiment of the invention, in the step K, the propagation delay time is to be predefined and stored in
In electronic control unit, the propagation delay time has high correlation, fuel pressure spread speed and combustion with fuel pressure spread speed
Oil temperature and fuel pressure, fuel characteristic are highly relevant.It tables look-up to obtain current propagation delay time by fuel oil temperature and rail pressure.
The principle of the present invention is：Under nominal situation, pressure limiting valve is closed；Rail pressure is higher than pressure limiting valve opening pressure
When, pressure limiting valve will be opened, and the fuel oil in rail runs through pressure limiting valve and lets out oil return box, then rail pressure declines rapidly, rail pressure variable quantity
Than under normal control state whenever will be much larger, therefore believed using system original rail pressure sensor acquisition rail pressure
Number, the item premised on the duration of the big Mr. Yu's pressure threshold of rail pressure is more than certain time threshold and the big Mr. Yu's rotary speed threshold value of rotating speed
Part only when the conditions are met calculates rail pressure variable quantity, judged using three sections of rail pressure variable quantities, two sections of rail pressure variable quantities judgements and
Mean value decision procedure judges whether pressure limiting valve is opened.After judging that pressure limiting valve is opened, if pressure limiting valve positive closing condition meets,
Then high-pressure oil pump fuel cut-off, fuel injector stop oil spout, and rail pressure is necessarily continued to decline until pressure limiting valve closing, by comparing rail pressure
Variable quantity closes threshold pressure differential with preset pressure limiting valve, and to judge whether pressure limiting valve closes, if judging, pressure limiting valve is closed, and is
System is promptly restored to normal operating condition；After judging that pressure limiting valve is closed, if rail pressure sensor failure or pressure limiting valve impact bars
Part meets, then high-pressure oil pump maximum capacity fuel feeding, while fuel injector stops oil spout or fuel injection pulsewidth is limited in certain pulse width threshold
To reach rapid pressure and wash pressure limiting valve open；When pressure limiting valve opening times are more than certain threshold value more than certain threshold value or accumulative opening time
Afterwards, high-pressure oil pump fuel cut-off, fuel injector stops oil spout until engine is shut down, caused by preventing pressure limiting valve opening pressure from changing
Permanent fault risk occurs for system.It is highly relevant between rail pressure variation moment and the response time of pressure limiting valve, it is based on rail
The buckling moment can highly accurately calculate the response time.Response time be pressure limiting valve security performance key index it
One, when response time is more than alarm threshold value, the output phase answers warning message；When response time is more than to inhibit threshold value
When, it needs to enter holddown.If high-pressure oil pump oil-feeding control uses open type fuel metering valve, if high engine speeds operate
When electronic control unit break down and restart, fuel injector will stop-spraying, fuel metering valve standard-sized sheet causes high-pressure oil pump by maximum fuel feeding, and
Supply capability is strong when high engine speeds operate, and fuel feeding is uprushed, oil spout hang-up causes pressure limiting valve to be opened, in electronic control unit restarting process
It is unable to monitor rail pressure signal, and the electronic control unit abnormal restarting time is shorter, although stop-spraying causes engine speed to decline, rail
Pressure is still greater than minimum limping pressure, that is, monitoring rail pressure variable quantity may not have after maintaining pressure limiting valve open state, electronic control unit to restart
Have and reach certain threshold value, causes erroneous judgement pressure limiting valve to be closed, be switched to so being switched from closed state by car key
After power-up state, compare whether rotating speed is more than or equal to certain rotary speed threshold value, to judge whether pressure limiting valve is opened.
The present invention due to using the technology described above, has the following advantages：
1. whether the present invention need not be opened using electrical equipment indicating pressure limiting valve or failure, and directly uses system original
Rail pressure sensor acquisition rail pressure signal, speed probe acquisition tach signal, fuel temperature sensor acquisition fuel oil temperature make
Signal source in order to control, it is convenient and easy without the existing system structure of change, it is of low cost, it is conducive to implement, convenient in batch life
Implement in the product of production.
2. passing through the quick and precisely judgement for the different conditions such as closing, open, test, impact to pressure limiting valve and effective control
System, plays the role of safeguard protection to high pressure co-rail system and diesel engine.
3. for the pressure limiting valve after unlatching, it can realize fast and reliable closing under certain conditions, make common rail fuel oil
System restores normal operation in the shortest possible time, to make engine recovery reach normal dynamic property, economy and
Emission request avoids the prolonged cyllopodia traveling of vehicle.
4. for the pressure limiting valve of closing, under rail pressure sensor failure, system mechanics failure or certain condition, quickly wash open
Pressure limiting valve reduces the time that system is in superelevation rail pressure, lifting system safety.
5. pair pressure limiting valve opening times, accumulative opening time and response time count, can be carried when transfiniting
Preceding early warning, or enter holddown to reduce the risk that permanent fault occurs for high pressure co-rail system.
6. can quick and precisely judge pressure limiting valve shape using open type fuel metering valve for high-pressure oil pump oil-feeding control
State takes control measure, avoid vehicle caused by being opened due to pressure limiting valve be short of power for a long time, engine combustion and discharge
The danger of deterioration, even engine misses.
Description of the drawings
Fig. 1 is high-pressure common-rail fuel system structure diagram.
Fig. 2 is the schematic diagram of the pressure limiting valve for high-pressure common-rail fuel system.
Fig. 3 is the calculation flow chart of the control method of Pressure Limiter of High-pressure Common Rail System.
Fig. 4 is rail pressure signal process chart.
Specific implementation mode
In order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, tie below
Conjunction is specifically illustrating and embodiment, and the present invention is described in detail.
Fig. 1 is high-pressure common-rail fuel system structure diagram.Low-voltage fuel is sucked into fuel filter 2, high pressure from fuel tank 1
A part of low-voltage fuel is compressed into high pressure fuel and is transported to common rail pipe 5 by oil pump 3, and common rail pipe 5 plays the role of accumulator, more
Remaining part point flows back to fuel tank 1 from the overflow valve on high-pressure oil pump 3 with together with 7 oil return of fuel injector；High pressure fuel is from common rail pipe 5 through height
Pressuring oil pipe flows to the fuel injector 7 of each cylinder；The pulse initial point and pulse that fuel injector 7 is exported according to electronic control unit (ECU) 8 are wide
Degree sprays into fuel oil in the combustion chamber of each cylinder of engine.5 one end of common rail pipe is equipped with rail pressure sensor 6, monitors common rail pipe in real time
Interior rail pressure situation, when rail pressure is more than pressure limiting valve opening pressure, pressure limiting valve 4 is opened, and the fuel oil in common rail pipe runs through limit
Pressure valve 4 lets out oil return box 1, and rail pressure is rapidly decreased in safe range, lifting system safety.Electronic control unit 8 is various by acquiring
Sensor signal and vehicle network signal judge system mode by built-in control strategy, send out accurate drive signal and drive
Corresponding actuator is moved, fuel delivery, rail pressure, oil spout angle and distributive value is made to carry out feedback regulation on demand.Common rail system is adopted
Sensor 9 includes：Crank angle sensor (or camshaft angle sensor), rail pressure sensor, coolant temperature sensing
Device, fuel temperature sensor, accelerator pedal sensor etc. are a variety of.The actuator driven signal of electronic control unit 8 includes：Oil spout
Device solenoid valve and high-pressure oil pump solenoid-driven signal.
Fig. 2 is a kind of schematic diagram of the pressure limiting valve 4 for high-pressure common-rail fuel system.11 be valve seat, and 12 be spool, and 13 are
Valve block, 14 be spring, and 15 be adjust pad, and 16 be valve body, and 17 be oil return screw, and 18 be sheath, and 19 be gasket seal.Pressure limiting
Valve operation principle is specifically：Under normal circumstances, spool 12 seals under the action of 14 pretightning force of spring with valve seat 11 accordingly
Seat surface is tightly bonded, and the pressure in common rail pipe 5 keeps normal control state.If the control of system occurs, abnormal or other are former
Cause causes the pressure in common rail pipe 5 to increase suddenly, and the power that high pressure fuel acts on sealed seat surface has been more than that spring 14 pre-tightens
Power forces spool 12 to move to right rapidly then spool 12 and valve seat 11 can be detached from, and fuel oil releases, and keeps the pressure in common rail pipe 5 rapid
Decline.
A kind of Pressure Limiter of High-pressure Common Rail System control method proposed by the present invention, includes the following steps：
A. by monitoring whether rail pressure value more than rail pressure upper limit threshold, rail pressure variable quantity and judges to limit in conjunction with speed conditions
Pressure valve state；When pressure limiting valve positive closing condition meets, pressure limiting valve actively closes control and enables；When pressure limiting valve impact condition is full
When sufficient, pressure limiting valve is actively opened control and is enabled；When response time alert if meets, corresponding warning message is set；When
When pressure limiting valve rejection condition meets, the control of pressure limiting valve active suppression enables.Pressure limiting valve state demarcation be initialization, close, test,
It opens, impact, inhibit 6 kinds of states.
B. the step of rail pressure and rail pressure variable quantity calculate：Rail pressure signal is acquired, data is carried out and judges that post filtering obtains rail pressure
Value, current rail pressure value subtract last time rail pressure and are worth to rail pressure variable quantity.
C. the step of pressure limiting valve is opened is judged in test mode：By the rail pressure variable quantity being calculated and preset pressure limiting valve
Starting differential pressure threshold value is compared, to judge whether pressure limiting valve is opened.
D. init state：For car key switch after power-up state, pressure limiting valve monitoring state enters init state,
Pressure limiting valve relevant control initializes.When high-pressure oil pump oil-feeding control uses open type fuel metering valve, if engine speed is more than
Minimum speed threshold value is opened equal to pressure limiting valve, then judges that pressure limiting valve is in open state, executes step f；If pressure limiting valve after the power is turned on
Open duration ToInterior, engine speed is always less than pressure limiting valve and opens minimum speed threshold value, then judges that pressure limiting valve is in and close
State executes step e.When high-pressure oil pump oil-feeding control uses other manner, judgement pressure limiting valve is closed, and executes step
e。
E. closed state：Restore high-pressure oil pump fuel feeding and fuel injector oil spout, and target track is flattened and is surely transitioned into currently
The calculated phase sets rail pressure value to system automatically under operating mode, and system is allowed to restore normal operation.Judge whether that meeting pressure limiting valve opens survey
Strip part executes step g if satisfied, then pressure limiting valve enters test mode；When rail pressure sensor failure, pressure limiting valve enters punching
State is hit, step h is executed.
F. open state：It adds up total time to pressure limiting valve opening times and unlatching；Into rail pressure limping pattern, and limit
Engine power processed can limit engine speed simultaneously.When rotating speed, which is less than or equal to pressure limiting valve, closes maximum speed threshold value, judgement
Pressure limiting valve is closed, and executes step e；When pressure limiting valve rejection condition meets, pressure limiting valve enters holddown, executes step
Rapid i；When pressure limiting valve positive closing condition meets, step j is executed.
G. test mode：It executes step m and calculates response time；When response time alert if meets, if
Set corresponding warning message；When response time rejection condition meets, step i is executed.It is closed most when rotating speed is less than pressure limiting valve
When high rotary speed threshold value, judgement pressure limiting valve is closed, and executes step e；When step c judges that pressure limiting valve is in open state,
Execute step f；When pressure limiting valve impact condition meets, pressure limiting valve enters impact conditions, executes step h.
H. impact conditions：Cumulative number of shocks, calculates the impact duration；High-pressure oil pump maximum capacity fuel feeding, while oil spout
Device stops oil spout or fuel injection pulsewidth is limited in pressure limiting valve impact pulse width threshold to reach rapid pressure and wash pressure limiting valve open.If turning
Speed is less than pressure limiting valve and closes maximum speed threshold value, then judges that pressure limiting valve is closed, and executes step e；When pressure limiting valve impacts
When unlocking condition meets, then judges that pressure limiting valve is in open state, execute step f；When pressure limiting valve shock-testing condition meets,
Then pressure limiting valve enters test mode, executes step g；When pressure limiting valve rejection condition meets, then pressure limiting valve enters holddown,
Execute step i.
I. holddown：High-pressure oil pump fuel cut-off, fuel injector stops oil spout until engine is shut down.
J. the step of pressure limiting valve positive closing：When pressure limiting valve positive closing condition meets, high-pressure oil pump fuel cut-off, spray
Oily device stops oil spout, and the rail pressure variable quantity being calculated is closed threshold pressure differential with preset pressure limiting valve to be compared, to judge
Whether pressure limiting valve closes, if judging, pressure limiting valve is closed, and thens follow the steps e, no to then follow the steps k.
K. judge pressure limiting valve whether occur can not closing fault the step of：If rail pressure goes straight down to zero, or from satisfaction
In the given time period counted when pressure limiting valve positive closing condition, it can not all judge that pressure limiting valve is closed always, then judge pressure limiting valve
Can not closing fault, execute step i, it is no to then follow the steps j.
L. the step of propagation delay time calculates：Until rail pressure sensor collects combustion at the time of calculating is opened from pressure limiting valve
Expect the period until the pressure change moment.
M. the step of response time calculates：Calculate meet pressure limiting valve open test condition after enter test mode when
Period until quarter at the time of step c judgement pressure limiting valves are in open state, time period subtract the biography that step l is calculated
Broadcasting delay time meets with a response delay time；If not judging, pressure limiting valve is opened, response time 0.
Fig. 3 is a kind of calculation flow chart of Pressure Limiter of High-pressure Common Rail System control method, connects first number in vinculum
Word indicates that leave state number, second digit indicate entry into state number.It is described in detail below：In step a, whole flow process is introduced
Frame and flow initial point.In stepb, rail pressure and rail pressure variable quantity are calculated.In step c, the rail pressure being calculated is changed
Amount is compared with preset pressure limiting valve starting differential pressure threshold value, to judge whether pressure limiting valve is opened.In step d, according to whether
For open type fuel metering valve and whether rotating speed judges whether pressure limiting valve is in open state more than threshold value, if pressure limiting valve is opened
It opens, then enters step f, otherwise enter step e.In step e, recovery system normal operation.Judge whether that meeting pressure limiting valve opens
Test condition is opened, if satisfied, thening follow the steps g；If when rail pressure sensor failure, h is thened follow the steps.In step f, to pressure limiting
Valve opening times and unlatching add up total time；Into rail pressure limping pattern, and engine power is limited, hair can be limited simultaneously
Motivation rotating speed.If it is determined that pressure limiting valve is closed, e is thened follow the steps；If pressure limiting valve rejection condition meets, then follow the steps
i；If pressure limiting valve positive closing condition meets, j is thened follow the steps.In step g, executes step m and calculate response time, if
Response time alert if meets, then corresponding warning message is arranged；If response time rejection condition meets, hold
Row step i.If rotating speed is less than pressure limiting valve closing maximum speed threshold value, step e is executed；It is opened when step c judges that pressure limiting valve is in
State is opened, step f is executed；If pressure limiting valve impact condition meets, h is thened follow the steps.In step h, add up number of shocks, meter
Calculate the impact duration；High-pressure oil pump maximum capacity fuel feeding, while fuel injector stops oil spout or fuel injection pulsewidth is limited in pressure limiting valve punching
It hits in pulse width threshold to reach rapid pressure and wash pressure limiting valve open.If rotating speed, which is less than pressure limiting valve, closes maximum speed threshold value, sentence
Fixed limit pressure valve is closed, and executes step e；When pressure limiting valve impact unlocking condition meets, then judges that pressure limiting valve is in and open
State is opened, step f is executed；When pressure limiting valve shock-testing condition meets, then pressure limiting valve enters test mode, executes step g；When
When pressure limiting valve rejection condition meets, then pressure limiting valve enters holddown, executes step i.In step i, high-pressure oil pump stops supplying
Oil, fuel injector stops oil spout until engine is shut down.
Fig. 4 is rail pressure signal process chart.Specifically：
1. rail pressure acquires：Acquire rail pressure signal；
2. data judge：The value of sampling carries out pressure sensor failure and judges to judge with reasonability, including pressure sensor
Output is continued for some time beyond normal range (NR)；Output valve is in TV(number of fuel feeding interval * times being calculated according to the rotating speed) time
Interior sampled value variable quantity is consistently less than Δ Plimit；It is maximum to be more than the judgement of rail pressure reasonability for sampled value variable quantity in unit interval
It is worth Δ Pmax。
If data judge exception and when anomalous counts do not reach threshold value, if last time sampled value is normal, last time is used
Sampled value；If last time sampled value is abnormal, last time rail pressure peak value is used.If anomalous counts reach threshold value, failure determines, adopts
It is determined with corresponding substitute scheme and substitutes rail pressure.And it is sequentially stored into data queue.
3. data queue's maximum value：Data queue's sampled value, which carries out being maximized operation, obtains rail pressure maximum value PmaxT；
4. determining time constant filter：PmaxTRail pressure value P after being filtered more than last timelastWhen, time constant filter is set to T10；
PlastWith PmaxTDifference be less than threshold pressure differential Δ PTWhen, time constant filter is set to T11, otherwise time constant filter be set to T12；
Threshold pressure differential calculates according to the following formula：
Δ V=(1+ θ) q
In formula, Δ PTFor threshold pressure differential, it is that fuel feeding and oil spout cause maximum pressure in common rail pipe to change in dispatching cycle
Amount；V is common rail pipe high pressure volume；Δ V is that common rail pipe changes oil mass after correcting, it is oil run and flows into the difference of flow；K is
Diesel fuel volume elasticity modulus, it is related to diesel oil density, rail pressure, temperature etc.；θ is safety margin；Q is estimated into common rail pipe
Oil mass.
5. filtering：To PmaxTCurrent rail pressure is obtained using filtering algorithm, filtering algorithm is as follows：
yk=α yk-1+(1-α)·xk-1
In formula, ykCurrently to export, yk-1It is exported for the last time；xk-1It is inputted for the last time；T1For time constant filter；T0
For the sampling period；α is coefficient.
Claims (25)
1. a kind of Pressure Limiter of High-pressure Common Rail System control method, which is characterized in that by monitoring whether rail pressure value is more than in rail pressure
Limit threshold value simultaneously judges pressure limiting valve state in conjunction with the rail pressure variable quantity and speed conditions calculated according to the rail pressure value that is monitored；When
When pressure limiting valve positive closing condition meets, pressure limiting valve actively closes control and enables；When pressure limiting valve impact condition meets, pressure limiting valve
Control is actively opened to enable；When response time alert if meets, corresponding warning message is set；When pressure limiting valve inhibits item
When part meets, the control of pressure limiting valve active suppression enables；The pressure limiting valve state demarcation is initialization, closes, test, opens, punching
It hits, inhibit 6 kinds of states.
2. a kind of Pressure Limiter of High-pressure Common Rail System control method as described in claim 1, which is characterized in that the rail pressure value prison
Survey method is by acquiring rail pressure signal, carrying out data and judge that post filtering obtains rail pressure value；The calculating side of the rail pressure variable quantity
Method is that current rail pressure value subtracts last time rail pressure and is worth to rail pressure variable quantity.
3. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 2, which is characterized in that the rail pressure value and
The step of rail pressure variable quantity calculates is as follows：
Rail pressure signal is acquired first；
Then pressure sensor failure judgement is carried out to sampled value and reasonability judges, including pressure sensor output continues one section
Time exceeds normal range (NR)；Output valve is in TV(number of the fuel feeding interval being calculated according to rotating speed * times) sampled value variation in the time
Amount is consistently less than Δ Plimit；Sampled value variable quantity judges maximum value Δ P more than rail pressure reasonability in unit intervalmax.If number
It is judged that exception and when anomalous counts do not reach threshold value, if last time sampled value is normal, uses last time sampled value；On if
Secondary sampled value is abnormal, then uses last time rail pressure peak value.If anomalous counts reach threshold value, failure determines, using corresponding substitute side
Case, which determines, substitutes rail pressure.And it is sequentially stored into data queue；
Then data queue sample value is carried out being maximized operation and obtains rail pressure maximum value PmaxT；；
Then time constant filter is determined：PmaxTRail pressure value P after being filtered more than last timelastWhen, time constant filter is set to T10；
PlastWith PmaxTDifference be less than threshold pressure differential Δ PTWhen, time constant filter is set to T11, otherwise time constant filter be set to T12；Pressure
Poor threshold value calculates according to the following formula：
Δ V=(1+ θ) q
Then to PmaxTCurrent rail pressure value is obtained using filtering algorithm：Filtering algorithm is as follows：
yk=α yk-1+(1-α)·xk-1
Finally, current rail pressure value subtracts last time rail pressure and is worth to rail pressure variable quantity.
4. a kind of Pressure Limiter of High-pressure Common Rail System control method as described in claim 1, which is characterized in that the pressure limiting valve is strong
Closedown condition processed is specially：Car key switch is in power-up state, and engine speed is more than rotary speed threshold value, and at engine
In zero oil mass spray regime, and without rail pressure sensor failure, and pressure limiting valve positive closing Sofe Switch is set as true, then judges to meet
Pressure limiting valve positive closing condition, otherwise judgement are unsatisfactory for.
5. a kind of Pressure Limiter of High-pressure Common Rail System control method as described in claim 1, which is characterized in that the pressure limiting valve punching
The condition of hitting is specially：Pressure limiting valve superelevation duration THInterior pressure limiting valve, which is opened, judges that unsuccessful and rotating speed is more than pressure limiting valve and closes highest
Rotary speed threshold value, then judgement meet pressure limiting valve impact condition, and otherwise judgement is unsatisfactory for.
6. a kind of Pressure Limiter of High-pressure Common Rail System control method as described in claim 1, which is characterized in that the operating lag
Time alert if is specially：If response time is more than response time alarm threshold value, judgement meets alert if,
Otherwise judgement is unsatisfactory for.
7. a kind of Pressure Limiter of High-pressure Common Rail System control method as described in claim 1, which is characterized in that the pressure limiting valve suppression
Condition processed is specially：When pressure limiting valve opening times reach maximum times threshold value or the accumulative opening time reaches maximum opening time threshold
When value or response time reach response time inhibition threshold value, then judgement meets pressure limiting valve rejection condition, otherwise judges
It is unsatisfactory for.
8. a kind of Pressure Limiter of High-pressure Common Rail System control method as described in claim 1, which is characterized in that high pressure co-rail system
The control method of pressure limiting valve is as follows：
A. the step of rail pressure and rail pressure variable quantity calculate：Rail pressure signal is acquired, data is carried out and judges that post filtering obtains rail pressure value, when
Preceding rail pressure value subtracts last time rail pressure and is worth to rail pressure variable quantity；
B. the step of pressure limiting valve is opened is judged in test mode：The rail pressure variable quantity being calculated and preset pressure limiting valve are opened
Threshold pressure differential is compared, to judge whether pressure limiting valve is opened；
C. init state：For car key switch after power-up state, pressure limiting valve monitoring state enters init state, pressure limiting
Valve relevant control initializes.Judge whether to meet pressure limiting valve abnormal start-up test condition, be opened if satisfied, then judging that pressure limiting valve is in
State is opened, step E is executed；Otherwise judgement pressure limiting valve is closed, and executes step D；
D. closed state：Restore high-pressure oil pump fuel feeding and fuel injector oil spout, and target track pressing is surely transitioned into current working
Automatically the calculated phase sets rail pressure value to lower system, and system is allowed to restore normal operation；Judge whether that meeting pressure limiting valve opens test-strips
Part executes step F if satisfied, then pressure limiting valve enters test mode；When rail pressure sensor failure, pressure limiting valve enters impact shape
State executes step G；
E. open state：It adds up total time to pressure limiting valve opening times and unlatching；Into rail pressure limping pattern, and limit hair
Motivation power can limit engine speed simultaneously；When rotating speed, which is less than or equal to pressure limiting valve, closes maximum speed threshold value, pressure limiting is judged
Valve is closed, and executes step D；When pressure limiting valve rejection condition meets, pressure limiting valve enters holddown, executes step H；
When pressure limiting valve positive closing condition meets, step I is executed；
F. test mode：It executes step m and calculates response time；When response time alert if meets, phase is set
Answer warning message；When response time rejection condition meets, step H is executed；Highest turn is closed when rotating speed is less than pressure limiting valve
When fast threshold value, judgement pressure limiting valve is closed, and executes step D；When step B judges that pressure limiting valve is in open state, execute
Step E；When pressure limiting valve impact condition meets, pressure limiting valve enters impact conditions, executes step G；
G. impact conditions：Cumulative number of shocks, calculates the impact duration；High-pressure oil pump maximum capacity fuel feeding, while fuel injector stops
Only oil spout or fuel injection pulsewidth are limited in pressure limiting valve impact pulse width threshold to reach rapid pressure and wash pressure limiting valve open；If rotating speed is small
Maximum speed threshold value is closed in pressure limiting valve, then judges that pressure limiting valve is closed, executes step D；It is opened when pressure limiting valve impacts
When condition meets, then judges that pressure limiting valve is in open state, execute step E；When pressure limiting valve shock-testing condition meets, then limit
Pressure valve enters test mode, executes step F；When pressure limiting valve rejection condition meets, then pressure limiting valve enters holddown, executes step
Rapid H；
H. holddown：High-pressure oil pump fuel cut-off, fuel injector stops oil spout until engine is shut down；
I. the step of pressure limiting valve positive closing：When pressure limiting valve positive closing condition meets, high-pressure oil pump fuel cut-off, fuel injector
Stop oil spout, the rail pressure variable quantity being calculated is closed threshold pressure differential with preset pressure limiting valve to be compared, to judge pressure limiting
Whether valve closes, if judging, pressure limiting valve is closed, and thens follow the steps D, no to then follow the steps J；
J. judge pressure limiting valve whether occur can not closing fault the step of：If rail pressure goes straight down to zero, or from meeting pressure limiting
In the given time period counted when valve positive closing condition, it can not all judge that pressure limiting valve is closed always, then judge that pressure limiting valve can not
Closing fault executes step H, no to then follow the steps I.
K. the step of propagation delay time calculates：Become until rail pressure sensor collects fuel pressure at the time of unlatching from pressure limiting valve
Change the period until the moment.
L. the step of response time calculates：Calculating meet pressure limiting valve open test condition after enter test mode at the time of it is straight
Period until at the time of step B judgement pressure limiting valves are in open state, time period subtract the propagation that step K is calculated and prolong
The slow time meets with a response delay time；If not judging pressure limiting valve unlatching or rail pressure sensor failure, response time 0.
9. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that in the step B
Judge whether pressure limiting valve is opened using three kinds of modes：
Method one：Three sections of rail pressure variable quantity judgements：In pressure limiting valve superelevation duration THIn time, rail pressure variable quantity g1Less than Δ P1
(threshold pressure differential 1) stablizes duration T in pressure limiting valveSIn time, second segment rail pressure variable quantity g2Less than Δ P2(threshold pressure differential 2),
And third section rail pressure variable quantity g3Less than Δ P3When (threshold pressure differential 3), judgement pressure limiting valve is opened, and otherwise this judgement is unsuccessful；
Method two：Two sections of rail pressure variable quantity judgements：In THIn time, rail pressure variable quantity g1Less than Δ P1, in TSIn time, by rail pressure
Variable quantity is cumulative, if rail pressure variable quantity accumulated value gsLess than rail pressure accumulated change amount Δ PA, then judge that pressure limiting valve is opened, otherwise originally
Judge unsuccessful；
Method three：Mean value judges：In THIn time, rail pressure variable quantity g1Less than Δ P1, in TSIn time, method one and method two are equal
It is unsatisfactory for, averages after accumulating n times to rail pressure, if average value suitable with rail pressure default value (i.e. average value and rail pressure default value
In certain deviation range), then judge that pressure limiting valve is opened, otherwise this judgement is unsuccessful.
10. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step C
In, the pressure limiting valve abnormal start-up test condition is specially：When high-pressure oil pump oil-feeding control uses open type fuel metering valve, if
Engine speed is more than or equal to pressure limiting valve and opens minimum speed threshold value, then judges that pressure limiting valve is in open state；If limiting after the power is turned on
Pressure valve opens duration ToInterior, engine speed is always less than pressure limiting valve and opens minimum speed threshold value, then judges that pressure limiting valve is in
Closed state.When high-pressure oil pump oil-feeding control uses other manner, judgement pressure limiting valve is closed；The pressure limiting valve is opened
When minimum speed threshold value is high-pressure oil pump maximum fuel feeding, fuel injector maximum oil spout, the minimum speed of pressure limiting valve unlatching can be reached.
11. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step D
In, when the pressure limiting valve closing maximum speed threshold value is high-pressure oil pump maximum fuel feeding, fuel injector stop-spraying, pressure limiting valve closing can be reached
Maximum speed.
12. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 11, which is characterized in that the step D
In, the recovery high-pressure oil pump fuel feeding is to drive duty ratio by adjusting high-pressure oil pump fuel metering valve, or change high pressure oil
The energization moment of solenoid valve is pumped to realize.
13. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 11, which is characterized in that the step D
In, described to restore fuel injector oil spout be the energization moment by changing fuel injector magnetic system, or distributive value is set as the phase and sets spray
Oil mass is realized.
14. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 11, which is characterized in that the step D
In, the pressure limiting valve opens test condition and is specially：If the duration that rail pressure is more than pressure limiting valve opening pressure threshold value is more than limit
Pressure valve monitors the duration and rotating speed is more than pressure limiting valve and closes maximum speed threshold value, then judgement meets pressure limiting valve unlatching test condition,
Otherwise judgement is unsatisfactory for.
15. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step E
In, rail pressure limping pattern, i.e. rail pressure control become opened loop control from closed-loop control, and high-pressure oil pump limping fuel delivery is according to current
Operating mode (rotating speed, distributive value) is obtained by looking into limping fuel feeding scale.High-pressure oil pump limping fuel delivery is between minimum limping fuel delivery
Between maximum limping fuel delivery.
16. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 15, which is characterized in that the step E
In, the limitation engine power is the output torque of the maximum distributive value or limitation engine by limiting fuel injector.
17. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step F
In, the response time rejection condition is specially：If response time, which is more than response time, inhibits threshold value, sentence
Surely meet rejection condition, otherwise judgement is unsatisfactory for.
18. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step G
In, the high-pressure oil pump maximum capacity fuel feeding is to arrive fuel feeding by driving duty ratio to adjust immediately high-pressure oil pump fuel metering valve
Maximum rating, or change energization moment of high-pressure oil pump solenoid valve to realize.
19. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 18, which is characterized in that the step G
In, it is the energization moment by changing fuel injector magnetic system that the fuel injector, which stops oil spout, or forbids fuel injector magnetic system work
Make or distributive value is set as zero to realize.
20. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 18, which is characterized in that the step G
In, the duration is impacted in the calculating, specially：When having just enter into impact conditions, the impact duration is assigned a value of 0, then every the time
After being spaced Tp, an impact duration cumulative step value Tp.
21. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 18, which is characterized in that the step G
In, the pressure limiting valve impact unlocking condition is specially：If it is minimum that rail pressure sensor failure and rotating speed are more than or equal to pressure limiting valve unlatching
Rotary speed threshold value and impact duration are more than pressure limiting valve and impact duration threshold value, then judge that pressure limiting valve meets unlocking condition, otherwise sentence
Surely it is unsatisfactory for.
22. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 18, which is characterized in that the step G
In, the pressure limiting valve shock-testing condition is specially：If rail pressure sensor fault-free and maximum impact number are not up to and rotating speed
More than pressure limiting valve closing maximum speed threshold value and after impacting the duration more than the pressure limiting valve impact duration, then judge that pressure limiting valve meets
Test condition, otherwise judgement are unsatisfactory for.
23. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step H
In, the high-pressure oil pump fuel cut-off or is driven high-pressure oil pump fuel metering valve by the way that target rail pressure is immediately become 0
Duty ratio adjust immediately arrive fuel feeding minimum state or non-oil condition, either change high-pressure oil pump solenoid valve the energization moment or
High-pressure oil pump electromagnetic valve work is forbidden to realize.
24. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step I
In, judge that the method whether pressure limiting valve closes is：If recur rail pressure change rate less than preset pressure limiting valve close threshold value and
The accumulated value of number more than or equal to 0 is more than or equal to pressure limiting valve and closes counter threshold, then confirms that pressure limiting valve is turned off.Pressure limiting valve
It is to be obtained according to rail pressure to look into pressure limiting valve closing threshold value table to close threshold value.
25. a kind of Pressure Limiter of High-pressure Common Rail System control method as claimed in claim 8, which is characterized in that the step K
In, the propagation delay time is to be predefined and stored in electronic control unit, and the propagation delay time has with fuel pressure spread speed
There are high correlation, fuel pressure spread speed and fuel oil temperature and fuel pressure, fuel characteristic highly relevant.Pass through fuel oil temperature
Degree and rail pressure table look-up to obtain current propagation delay time.
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| CN109339965A (en) * | 2018-12-19 | 2019-02-15 | 重庆红江机械有限责任公司 | A kind of pressure-control valve for common rail system |
| CN109611247A (en) * | 2018-11-21 | 2019-04-12 | 中国航发西安动力控制科技有限公司 | A kind of fuel oil collection device for preventing engine fuel from revealing |
| CN110067660A (en) * | 2019-03-15 | 2019-07-30 | 江苏大学 | A kind of fault diagnosis of high-pressure common-rail diesel engine rail-pressure and reply control method |
| CN111120133A (en) * | 2019-12-12 | 2020-05-08 | 一汽解放汽车有限公司 | Control method and device of electric control pressure relief valve, vehicle and storage medium |
| CN111255565A (en) * | 2020-01-17 | 2020-06-09 | 一汽解放汽车有限公司 | Failure monitoring device for mechanical PCV (positive pressure regulator) of high-pressure common rail system |
| CN113803184A (en) * | 2020-06-12 | 2021-12-17 | 卓品智能科技无锡有限公司 | Method for detecting whether pressure limiting valve is clamped at closed position |
| CN113931763A (en) * | 2021-09-30 | 2022-01-14 | 东风商用车有限公司 | High-pressure common rail pipe |
| CN117434878A (en) * | 2023-12-22 | 2024-01-23 | 山东朝辉自动化科技有限责任公司 | Monitoring device for digital stock ground intelligent control equipment based on unmanned aerial vehicle |
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| CN110067660B (en) * | 2019-03-15 | 2021-12-21 | 江苏大学 | Fault diagnosis and coping control method for rail pressure of high-pressure common rail diesel engine |
| CN111120133A (en) * | 2019-12-12 | 2020-05-08 | 一汽解放汽车有限公司 | Control method and device of electric control pressure relief valve, vehicle and storage medium |
| CN111120133B (en) * | 2019-12-12 | 2022-07-15 | 一汽解放汽车有限公司 | Control method and device of electric control pressure relief valve, vehicle and storage medium |
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| CN117434878A (en) * | 2023-12-22 | 2024-01-23 | 山东朝辉自动化科技有限责任公司 | Monitoring device for digital stock ground intelligent control equipment based on unmanned aerial vehicle |
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Application publication date: 20181026 |