CN108894885A - Relief valve open state device for identifying and its method for common rail for diesel engine system - Google Patents
Relief valve open state device for identifying and its method for common rail for diesel engine system Download PDFInfo
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- CN108894885A CN108894885A CN201810794823.4A CN201810794823A CN108894885A CN 108894885 A CN108894885 A CN 108894885A CN 201810794823 A CN201810794823 A CN 201810794823A CN 108894885 A CN108894885 A CN 108894885A
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- rail pressure
- pressure signal
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- upper limit
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of relief valve open state device for identifying for common rail for diesel engine system, including common rail unit, for sending the practical rail pressure signal of acquisition to processor unit and receiving the actuator driven electric current of the processor unit transmission；Processor unit, the practical rail pressure signal generation first object rail pressure signal for being sent according to the common rail unit is received, and the second target rail pressure signal is generated according to the first object rail pressure signal and amendment rail pressure signal；Actuator driven electric current, which is generated, according to the second target rail pressure signal is sent to common rail unit；Also disclose a kind of relief valve open state discrimination method for common rail for diesel engine system.The present invention judges rail pressure departure degree by active control rail pressure target value, avoids because engine enters erroneous judgement caused by specific operation, can further improve relief valve open state identification precision.
Description
Technical field
The invention belongs to common rail for diesel engine systems technology fields, and in particular to a kind of pressure release for common rail for diesel engine system
Valve open state device for identifying and its method.
Background technique
Common rail system can not using time pressure formula fuel metering principle as third generation diesel fuel injection system
The independent injection pressure adjusted in common rail pipe is influenced by engine speed and distributive value, so as to clever in entire condition range
Optimization injection pressure living, and can realize multi-injection, optimize injection rate.Relative to original monoblock pump fuel system, common rail
System the Emission Optimization, slow-speed of revolution torque, noise, in terms of have certain advantage, at present just gradually instead of monomer
Pump fuel system.
As shown in Figure 1, common rail system includes the main components such as high-pressure pump, fuel injector, sensor, controller, part vehicle
In addition to above-mentioned component, common rail system is also equipped with relief valve；Relief valve is often mounted on common rail pipe one end, and valve body side is connected to common rail pipe
Interior high pressure chest, the other side pass through piping connection common rail system low pressure oil way；Relief valve is in close state usually, by high pressure chest
It is isolated with low pressure oil way；When common rail overpressure is excessively high, relief valve can be connected automatically, be connected to high pressure chest with low pressure oil way,
It releases part fuel oil, avoids common rail system hypertonia.After relief valve is opened simultaneously, common rail overpressure can be made to maintain essentially in
One stable level, that is, have the function of pressure stabilizing, guarantee engine can the normal operating in Part load, realize limp-home
Function.
The service life of relief valve is limited, therefore the opening times of relief valve and opening time all will be in the controls of common rail system
It is recorded inside device processed.When opening times or opening time reaching the upper limit, control system will be prompted to user and replace.It is right
In control system, realize that the premise of above-mentioned function is correctly determined the open state of relief valve, but due to pressure release
Valve is a mechanical part, not can be used as the sensor for feeding back open state, so accurate relief valve can not be directly acquired
Open state can only judge indirectly whether relief valve is opened by the rail pressure in common rail pipe.
At this stage there are mainly two types of common relief valve open state identification algorithms.The first algorithm is：When rail pressure is more than
After maximum pressure, control system can record the rail pressure rate of change in a period of time later, when rail pressure satisfaction is continuous more
When secondary rapid decrease, that is, think that relief valve has turned on.Second algorithm is：After rail pressure is more than maximum pressure, control system meeting
Rail pressure absolute value in a period of time later is recorded, when rail pressure is in a certain range always in the period, shows pressure release
Valve has turned on, and is in pressure stabilizing state.
Although existing method has the advantages that simple possible, it is passively monitoring rail pressure state and is not considering to send out
Under the influence of motivation operating condition, it is possible to judging by accident.If when target rail pressure rapid decrease, though relief valve is not opened,
Still relief valve may be judged by accident according to algorithm one to open.When engine is chronically at stable state, target rail pressure and relief valve are steady after opening
When orbit determination pressure is closer to, erroneous judgement is likely to occur according to algorithm two.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of relief valve opening states for common rail for diesel engine system
State device for identifying and its method.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
The embodiment of the present invention provides a kind of relief valve open state device for identifying for common rail for diesel engine system comprising
Common rail unit, processor unit, the common rail unit, for sending the practical rail pressure signal of acquisition to processor unit and connecing
Receive the actuator driven electric current that the processor unit is sent；The processor unit, for according to the reception common rail unit
The practical rail pressure signal sent generates first object rail pressure signal and according to the first object rail pressure signal and amendment rail pressure
Signal generates the second target rail pressure signal；Actuator driven electric current, which is generated, according to the second target rail pressure signal is sent to common rail
Unit.
In above scheme, the common rail unit includes rail pressure sensor, actuator.
In above scheme, the processor unit includes that engine management module, target rail pressure, relief valve state are distinguished
Know module, execution module, the engine management module generates first object rail pressure letter according to the practical rail pressure signal of input
Number, the relief valve state identification module generates amendment rail pressure signal, the target rail pressure according to the practical rail pressure signal of input
Module generates the second target rail pressure signal according to first object rail pressure signal and amendment rail pressure signal and is sent to execution module, institute
Execution module is stated, actuator driven electric current is generated according to the second target rail pressure signal and is sent to common rail unit.
The embodiment of the present invention also provides a kind of relief valve open state discrimination method for common rail for diesel engine system, the party
Method is：The processor combines amendment rail pressure signal to generate target rail pressure signal, and root according to the practical rail pressure signal of acquisition
Actuator driven electric current is generated according to the target rail pressure signal；According to the rail pressure deviation of practical rail pressure signal and target rail pressure signal
Determine the open state of relief valve.
In above scheme, the processor combines amendment rail pressure signal to generate target track according to the practical rail pressure signal of acquisition
Signal is pressed, specially：The processor generates first object rail pressure signal according to the practical rail pressure signal of input, according to input
Practical rail pressure signal generates amendment rail pressure signal, finally, generating second according to first object rail pressure signal and amendment rail pressure signal
Target rail pressure signal.
It is described that amendment rail pressure signal is generated according to the practical rail pressure signal of input in above scheme, specially：When the reality
When border rail pressure signal is more than the rail pressure upper limit, it is generated as 1 identification process activation mark；After identification process activation mark is set to 1,
Timer starts timing, when the real time when timer is more than the timing upper limit, is generated as 0 identification process activation mark
Know；Mark is activated to determine amendment rail pressure signal according to the identification process.
It is described to activate mark to determine amendment rail pressure signal according to relief valve identification process in above scheme, specially：Work as institute
When stating identification process activation and being identified as 1, and the 0 < real time < timing upper limit/4, when the amendment rail pressure signal=practical
Between/(timer limit/4) × amendment rail pressure upper limit；
1, and the timing upper limit/4 < real time < timer upper limit/2 are identified as when the identification process activates, it is described
Correct rail pressure signal=(the timing upper limit/2- real time)/(the timing upper limit/4) × amendment rail pressure upper limit；
When identification process activation is identified as 1, and the timing upper limit/2 < real time < timing upper limit × 3/4, institute
State amendment rail pressure signal=- 1 × (real time-timing upper limit/2)/(the timing upper limit/4) × amendment rail pressure upper limit；
When identification process activation is identified as 1, and the timer upper limit × 3/4 < real time < timing upper limit, institute
State amendment rail pressure signal=- 1 × (the timing upper limit-real time)/(the timing upper limit/4) × amendment rail pressure upper limit.
It is described that second target rail pressure letter is generated according to first object rail pressure signal and amendment rail pressure signal in above scheme
Number, specially：The second target rail pressure signal=first object rail pressure signal+amendment rail pressure, then to second target
Rail pressure signal carries out limit value protection, if the second target rail pressure signal is greater than the target rail pressure upper limit, the second target rail pressure
Signal=target rail pressure the upper limit；It is the second target rail pressure signal if the second target rail pressure signal is less than target track pressure limit
=target track pressure limit.
In above scheme, it is described according to identification process activation be identified as 1 during, the second target rail pressure signal and reality
The rail pressure deviation of rail pressure signal judges relief valve open state, specially：It is built-in when the identification process activation is identified as 1
Timer starts to add up, constantly cumulative rail pressure deviation summation, i.e. rail pressure deviation summation=practical rail pressure signal the-the second target rail pressure
Signal+rail pressure deviation summation；After timer is more than the upper limit, i.e., when identification process activation is identified as 0, according to rail pressure deviation summation
Rail pressure deviation, i.e. rail pressure deviation=rail pressure deviation summation/timer is calculated.
It is described that relief valve open state is judged according to rail pressure deviation in above scheme, specially：When rail pressure deviation is more than rail
When pressing upper deviation, determine that relief valve is open state；When rail pressure deviation is less than rail pressure upper deviation, determine that relief valve is
Closed state.
Compared with prior art, the present invention judges rail pressure departure degree by active control rail pressure target value, avoid because
Engine enters erroneous judgement caused by specific operation, can further improve relief valve open state identification precision.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of common rail system of the invention；
Fig. 2 provides a kind of relief valve open state device for identifying for common rail for diesel engine system for the embodiment of the present invention
Functional block diagram；
Fig. 3 is implementation process figure of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention provides a kind of relief valve open state device for identifying for common rail for diesel engine system, such as Fig. 2
It is shown comprising common rail unit 10, processor unit 20, the common rail unit 10 are used to send acquisition to processor unit 20
Practical rail pressure signal, and receive the actuator driven electric current that the processor unit 20 is sent；The processor unit 20 is used
In the practical rail pressure signal sent according to the reception common rail unit 10 to generate first object rail pressure signal and according to described
First object rail pressure signal and amendment rail pressure signal generate the second target rail pressure signal；It is raw according to the second target rail pressure signal
Common rail unit 10 is sent at actuator driven electric current.
The common rail unit 10 includes rail pressure sensor 11, actuator 12.
The processor unit 20 includes engine management module 21, target rail pressure 22, relief valve state identification mould
Block 23, execution module 24, the engine management module 21 generate first object rail pressure letter according to the practical rail pressure signal of input
Number, the relief valve state identification module 23 generates amendment rail pressure signal, the target track according to the practical rail pressure signal of input
Die block 22 generates the second target rail pressure signal according to first object rail pressure signal and amendment rail pressure signal and is sent to execution module
24, the execution module 24 generates actuator driven electric current according to the second target rail pressure signal and is sent to common rail unit 10.
When the relief valve state identification module 23 is specifically used for the practical rail pressure signal more than the rail pressure upper limit, it is generated as
1 identification process activates mark；After identification process activation mark sets 1, timer starts timing, the reality when timer
When time is more than the timing upper limit, it is generated as 0 identification process activation mark；Mark is activated to determine amendment rail pressure according to identification process
Signal.
The relief valve state identification module 23 is specifically used for being identified as 1, and 0 < reality when identification process activation
When the time < timing upper limit/4, the amendment rail pressure signal=real time/(timer limit/4) × amendment rail pressure upper limit；
1, and the timing upper limit/4 < real time < timer upper limit/2 are identified as when the identification process activates, it is described
Correct rail pressure signal=(the timing upper limit/2- real time)/(the timing upper limit/4) × amendment rail pressure upper limit；
When identification process activation is identified as 1, and the timing upper limit/2 < real time < timing upper limit × 3/4, institute
State amendment rail pressure signal=- 1 × (real time-timing upper limit/2)/(the timing upper limit/4) × amendment rail pressure upper limit；
It is identified as 1, and the timing upper limit × 3/4 < real time < timing upper limit when the identification process activates, it is described
Correct rail pressure signal=- 1 × (the timing upper limit-real time)/(the timing upper limit/4) × amendment rail pressure upper limit.
As shown in figure 3, after practical rail pressure is more than the rail pressure upper limit, the identification process of the relief valve state identification module 23
Activation mark starts, and the built-in timer starts to add up.
When timer is less than the timer upper limit 1/4, amendment rail pressure is positive growth, after being added with first object rail pressure signal
Obtain the second target rail pressure signal.Practical rail pressure rapid decrease at this time, the second target rail pressure signal slowly decline, and rail pressure deviation is fast
Speed increases.
After timer is more than the timer upper limit 1/4, amendment rail pressure is negative growth, after being added with first object rail pressure signal
The second target rail pressure signal is obtained, the second target rail pressure signal and first object rail pressure signal are gradually equal.Practical rail pressure at this time
Suitable with the second target rail pressure signal, rail pressure deviation slowly increases.
After timer is more than the timer upper limit 1/2, amendment rail pressure is negative growth, but has been in negative value, so that second
Target rail pressure signal is less than first object rail pressure signal.Although engine is in stable state at this time, first object rail pressure signal is basic
Stablize, but the influence due to correcting rail pressure, the second target rail pressure signal are still declining.Although practical rail pressure and first object rail
It presses signal suitable, but is still being continued to increase with the deviation of the second target rail pressure signal, so that rail pressure deviation quickly increases.
After timer is more than the timer upper limit 3/4, amendment rail pressure is positive growth, and gradual is 0.Second target rail pressure signal
Also gradually equal with first object rail pressure signal, rail pressure deviation slowly increases.
After timer is more than the upper limit, rail pressure deviation is calculated according to rail pressure deviation summation.
Such as the 0 < timer < timer upper limit, rail pressure deviation summation=practical rail pressure-target rail pressure+rail pressure deviation summation.
When timer is more than the timer upper limit, calculated according to rail pressure deviation summation, specially rail pressure deviation=rail pressure is inclined
Poor summation/timer.
Although engine is in stable state, the steady pressure after first object rail pressure signal is opened with relief valve differs smaller,
But since amendment rail pressure makes the second target rail pressure signal be in slow process, so practical rail pressure and the second target rail pressure are believed
Number deviation it is larger, and be apparently higher than the rail pressure upper deviation during normal control, opened it is possible thereby to determine that relief valve is in
Open state.
The embodiment of the present invention also provides a kind of relief valve open state discrimination method for common rail for diesel engine system, the party
Method is realized by following steps：
Step 101：Processor combines the unlatching corrected rail pressure signal and determine relief valve according to the practical rail pressure signal of acquisition
State and generate target rail pressure signal.
Specifically, the processor generates first object rail pressure signal according to the practical rail pressure signal of input, according to input
Practical rail pressure signal generate amendment rail pressure signal, finally, generating the according to first object rail pressure signal and amendment rail pressure signal
Two target rail pressure signals.
It is described that amendment rail pressure signal is generated according to the practical rail pressure signal of input, specially：When the practical rail pressure signal
When more than the rail pressure upper limit, it is generated as 1 identification process mark；After identification process activation mark sets 1, timer starts timing,
When real time when timer is more than the timing upper limit, it is generated as 0 identification process activation mark；Swashed according to identification process
Mark living determines amendment rail pressure signal.
It is described to activate mark to determine amendment rail pressure signal according to identification process, specially：It is marked when the identification process activates
Knowing is 1, when and the 0 < real time < timing upper limit/4, the amendment rail pressure signal=real time/(timer limits/4) ×
Correct the rail pressure upper limit；
1, and the timing upper limit/4 < real time < timer upper limit/2 are identified as when the identification process activates, it is described
Correct rail pressure signal=(the timing upper limit/2- real time)/(the timing upper limit/4) × amendment rail pressure upper limit；
When identification process activation is identified as 1, and the timing upper limit/2 < real time < timing upper limit × 3/4, institute
State amendment rail pressure signal=- 1 × (real time-timing upper limit/2)/(the timing upper limit/4) × amendment rail pressure upper limit；
When identification process activation is identified as 1, and the timer upper limit × 3/4 < real time < timing upper limit, institute
State amendment rail pressure signal=- 1 × (the timing upper limit-real time)/(the timing upper limit/4) × amendment rail pressure upper limit.
It is described that second target rail pressure signal is generated according to first object rail pressure signal and amendment rail pressure signal, specially：Institute
The second target rail pressure signal=first object rail pressure signal+amendment rail pressure is stated, then the second target rail pressure signal is carried out
Limit value protection, if the second target rail pressure signal is greater than the target rail pressure upper limit, the second target rail pressure signal=target track
Press the upper limit；It is the second target rail pressure signal=target track pressure if the second target rail pressure signal is less than target track pressure limit
Limit.
It is described be identified as 1 according to identification process activation during, the second target rail pressure signal and practical rail pressure signal
Rail pressure deviation judges relief valve open state, specially：When the identification process activation is identified as 1, built-in timer starts
It is cumulative, constantly cumulative rail pressure deviation summation, i.e. rail pressure deviation summation=the-the second target of practical rail pressure signal rail pressure signal+rail pressure
Deviation summation；After timer is more than the upper limit, i.e., when identification process activation is identified as 0, it is calculated according to rail pressure deviation summation
Rail pressure deviation, i.e. rail pressure deviation=rail pressure deviation summation/timer.
It is described that relief valve open state is judged according to rail pressure deviation, specially：When rail pressure deviation is more than rail pressure upper deviation
When, determine that relief valve is open state；When rail pressure deviation is less than rail pressure upper deviation, determine that relief valve is in off state.
Although engine is in stable state, the steady pressure after first object rail pressure signal is opened with relief valve differs smaller,
But since amendment rail pressure makes the second target rail pressure signal be in slow process, so practical rail pressure and the second target rail pressure are believed
Number deviation it is larger, and be apparently higher than the rail pressure upper deviation during normal control, opened it is possible thereby to determine that relief valve is in
Open state.
Step 102：Actuator driven electric current is generated according to the target rail pressure signal.
Specifically, actuator driven electric current is generated according to the second target rail pressure signal.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (10)
1. a kind of relief valve open state device for identifying for common rail for diesel engine system, which is characterized in that including common rail unit,
Processor unit, the common rail unit, for sending the practical rail pressure signal of acquisition to processor unit and receiving the place
Manage the actuator driven electric current that device unit is sent；The processor unit, the reality for being sent according to the common rail unit is received
Border rail pressure signal generates first object rail pressure signal and is generated according to the first object rail pressure signal and amendment rail pressure signal
Second target rail pressure signal；Actuator driven electric current, which is generated, according to the second target rail pressure signal is sent to common rail unit.
2. the relief valve open state device for identifying according to claim 1 for common rail for diesel engine system, feature exist
In the common rail unit includes rail pressure sensor, actuator.
3. the relief valve open state device for identifying according to claim 1 or 2 for common rail for diesel engine system, feature
It is, the processor unit includes engine management module, target rail pressure, relief valve state identification module, executes mould
Block, the engine management module generate first object rail pressure signal, the relief valve shape according to the practical rail pressure signal of input
State recognizes module, generates amendment rail pressure signal, the target rail pressure, according to the first mesh according to the practical rail pressure signal of input
Mark rail pressure signal and amendment rail pressure signal generate the second target rail pressure signal and are sent to execution module, the execution module, according to
Second target rail pressure signal generates actuator driven electric current and is sent to common rail unit.
4. a kind of relief valve open state discrimination method for common rail for diesel engine system, which is characterized in that the processor root
Amendment rail pressure signal is combined to generate target rail pressure signal according to the practical rail pressure signal of acquisition, and according to the target rail pressure signal
Generate actuator driven electric current；The opening state of relief valve is determined according to the rail pressure deviation of practical rail pressure signal and target rail pressure signal
State.
5. a kind of relief valve open state discrimination method for common rail for diesel engine system according to claim 4, special
Sign is that the processor combines amendment rail pressure signal to generate target rail pressure signal according to the practical rail pressure signal of acquisition, specifically
For：The processor generates first object rail pressure signal according to the practical rail pressure signal of input, is believed according to the practical rail pressure of input
Number generate amendment rail pressure signal, finally, according to first object rail pressure signal and amendment rail pressure signal generate the second target rail pressure letter
Number.
6. a kind of relief valve open state discrimination method for common rail for diesel engine system according to claim 5, special
Sign is, described to generate amendment rail pressure signal according to the practical rail pressure signal of input, specially：When the practical rail pressure signal is super
When crossing the rail pressure upper limit, it is generated as 1 identification process activation mark；After identification process activation mark is set to 1, timer starts to count
When, when the real time when timer is more than the timing upper limit, it is generated as 0 identification process activation mark；According to the identification
Process activation mark determines amendment rail pressure signal.
7. a kind of relief valve open state discrimination method for common rail for diesel engine system according to claim 6, special
Sign is, described to activate mark to determine amendment rail pressure signal according to relief valve identification process, specially：When the identification process swashs
Work is identified as 1, and 0<Real time<When the timing upper limit/4, the amendment rail pressure signal=real time/(timer limit/4)
× amendment rail pressure the upper limit；
When identification process activation is identified as 1, and the timing upper limit/4<Real time<The timer upper limit/2, the amendment rail
Press signal=(the timing upper limit/2- real time)/(the timing upper limit/4) × amendment rail pressure upper limit；
When identification process activation is identified as 1, and the timing upper limit/2<Real time<The timing upper limit × 3/4, the amendment
Rail pressure signal=- 1 × (real time-timing upper limit/2)/(the timing upper limit/4) × amendment rail pressure upper limit；
When identification process activation is identified as 1, and the timer upper limit × 3/4<Real time<The timing upper limit, the amendment
Rail pressure signal=- 1 × (the timing upper limit-real time)/(the timing upper limit/4) × amendment rail pressure upper limit.
8. a kind of relief valve open state identification for common rail for diesel engine system according to claim 5-7 any one
Method, which is characterized in that described that second target rail pressure signal, tool are generated according to first object rail pressure signal and amendment rail pressure signal
Body is：Then the second target rail pressure signal=first object rail pressure signal+amendment rail pressure is believed the second target rail pressure
Number carry out limit value protection, if the second target rail pressure signal be greater than the target rail pressure upper limit, the second target rail pressure signal=
The target rail pressure upper limit；It is the second target rail pressure signal=target if the second target rail pressure signal is less than target track pressure limit
Rail pressure lower limit.
9. a kind of relief valve open state discrimination method for common rail for diesel engine system according to claim 7, special
Sign is, it is described be identified as 1 according to identification process activation during, the rail of the second target rail pressure signal and practical rail pressure signal
Pressure deviation judges relief valve open state, specially：When the identification process activation is identified as 1, built-in timer starts to tire out
Add, constantly cumulative rail pressure deviation summation, i.e. rail pressure deviation summation=| practical the-the second target of rail pressure signal rail pressure signal |+rail pressure
Deviation summation；After timer is more than the upper limit, i.e., when identification process activation is identified as 0, it is calculated according to rail pressure deviation summation
Rail pressure deviation, i.e. rail pressure deviation=rail pressure deviation summation/timer.
10. a kind of relief valve open state discrimination method for common rail for diesel engine system according to claim 9, special
Sign is, described to judge relief valve open state according to rail pressure deviation, specially：When rail pressure deviation is more than rail pressure upper deviation
When, determine that relief valve is open state；When rail pressure deviation is less than rail pressure upper deviation, determine that relief valve is in off state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810794823.4A CN108894885B (en) | 2018-07-18 | 2018-07-18 | Device and method for identifying opening state of pressure release valve for common rail system of diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810794823.4A CN108894885B (en) | 2018-07-18 | 2018-07-18 | Device and method for identifying opening state of pressure release valve for common rail system of diesel engine |
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| CN108894885A true CN108894885A (en) | 2018-11-27 |
| CN108894885B CN108894885B (en) | 2020-09-01 |
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| CN201810794823.4A Active CN108894885B (en) | 2018-07-18 | 2018-07-18 | Device and method for identifying opening state of pressure release valve for common rail system of diesel engine |
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| CN108120551A (en) * | 2016-11-30 | 2018-06-05 | 福特环球技术公司 | Identification range fuel pressure transducer errors |
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