CN102182574B - Method and device for controlling rail pressure in high-pressure common rail system - Google Patents
Method and device for controlling rail pressure in high-pressure common rail system Download PDFInfo
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- CN102182574B CN102182574B CN201110035491.XA CN201110035491A CN102182574B CN 102182574 B CN102182574 B CN 102182574B CN 201110035491 A CN201110035491 A CN 201110035491A CN 102182574 B CN102182574 B CN 102182574B
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Abstract
The invention relates to a method and device for controlling rail pressure in a high-pressure common rail system. The method comprises the following steps of: acquiring a rail pressure measured value based on a crank turn angle; filtering actual rail pressure measured in real time to form input rail pressure; sampling the input rail pressure at the predefined crank turn angle interval to form sampling signals; selecting the sampling signals in the rail pressure stabilizing region of the high-pressure common rail system to be used as characteristic sampling points of rail pressure; filtering the characteristic sampling points to generate a rail pressure measured value; carrying out PID (Proportion Integration Differentiation) control on the rail pressure in the high-pressure common rail system based on the rail pressure measured value; setting the expected rail pressure of the high-pressure common rail system; calculating PID control quantity based on the difference value between the expected rail pressure and the rail pressure measured value; and controlling the high-pressure common rail system based on the PID control quantity to acquire controlled actual rail pressure. The invention also relates to a device corresponding to the method.
Description
Technical field
The embodiments of the present invention relate to engine art, and more specifically, relate to a kind of method and apparatus of controlling rail pressure in high pressure co-rail system.
Background technique
High pressure co-rail system is a kind of oil supply system for diesel engine.In the closed-loop system that this system forms at high pressure oil pump, real-time pressure sensor and electronic control unit, can the generation of jet pressure and course of injection is completely separate from each other.It is by high pressure oil pump, high pressure fuel to be transported in common feeder line, by the pressure in real-time pressure sensor measurement common feeder line, realize accurate control, make the pressure size in common feeder line irrelevant with the rotating speed of motor, thereby significantly reduce the degree that the pressure in diesel engine common feeder line changes with engine speed.
Electronic control unit is controlled the fuel injection quantity of oil sprayer, and fuel injection quantity size depends on common feeder line pressure and solenoid valve open-interval length.Conventionally, the pressure in common feeder line is called to common rail pressure, or referred to as rail pressure.In common rail system, common rail pressure has not only determined the height of injection pressure, and is the important parameter of oil spout metering, and its stability and transient response directly affect the performances such as engine start, idling, acceleration.So guarantee accurately to rail pressure signal sample, filtering and control significant.
In the prior art, developed multiple for making the actual rail pressure of high pressure co-rail system accord with the method for expecting rail pressure, wherein conventional process is to utilize the rail pressure of high pressure co-rail system of actual measurement as a feedback, and adopts pid control algorithm to make the actual rail pressure rail pressure that meets the expectation.Yet, due to the actual measurement rail pressure that can not measure exactly in high pressure co-rail system, thereby compress into when row PID controls and cannot learn expectation rail pressure and the actual effectively difference between rail pressure in follow-up tracking.
When employing exists the actual measurement rail pressure of error to carry out PID control, may cause originally stable rail pressure to produce larger fluctuation.These errors, through after circulation amplify repeatedly, can cause PID to control and produce Redundant Control, and greatly affect the precision of rail pressure control, even occur that PID controls can cause on the contrary the significantly situation of fluctuation of rail pressure when serious.
Summary of the invention
Therefore, do not changing under the prerequisite of the existing configuration of high pressure co-rail system, how realizing effective rail pressure more convenient, that measure in high pressure co-rail system exactly becomes a problem demanding prompt solution as far as possible.For this reason, the invention provides a kind of method and apparatus of measuring rail pressure based on crank angle, and a kind of effective rail pressure value of measuring based on crank angle is provided, control the method and apparatus of rail pressure.
According to an embodiment of the invention, a kind of method of controlling rail pressure in high pressure co-rail system is provided, comprising:
-rail pressure the measured value that obtains based on crank angle, comprising:
The actual rail pressure of measuring is in real time carried out to filtering to form input rail pressure; In predefined crankshaft angle interval, described input rail pressure is sampled to form sampled signal; Selection is positioned at the described sampled signal of rail pressure meadow of described high pressure co-rail system as the feature sampled point of described rail pressure; Described feature sampled point is carried out to filtering to generate the measured value of described rail pressure;
-based on described rail pressure measured value, generate and calculate the PID controlled quentity controlled variable of controlling described high pressure co-rail system, comprising:
The expectation rail pressure of described high pressure co-rail system is set; Difference based between described expectation rail pressure and the measured value of described rail pressure, calculates the PID controlled quentity controlled variable of controlling described high pressure co-rail system.
According to another embodiment of the present invention, the rail pressure meadow in wherein said high pressure co-rail system arrives the region in budc 35-10 degree corresponding to described crank angle.
According to another embodiment of the present invention, a kind of device of controlling rail pressure in high pressure co-rail system is provided, comprising:
-measuring appliance, for measuring rail pressure based on crank angle, comprising:
Input rail pressure shaper, for carrying out the actual rail pressure of measuring in real time filtering to form input rail pressure; Sampled signal shaper, for sampling to form sampled signal in predefined crankshaft angle interval to described input rail pressure; Feature Samples selecting device, for the described sampled signal of rail pressure meadow of selecting to be positioned at described high pressure co-rail system as the feature sampled point of described rail pressure; Rail pressure signal generator, for carrying out filtering to generate the measured value of described rail pressure to described feature sampled point;
-PID controller, for based on described rail pressure measured value, generates and calculates the PID controlled quentity controlled variable of controlling described high pressure co-rail system, comprising:
Device is set, the expectation rail pressure of described high pressure co-rail system is set; Controlled quentity controlled variable calculator, for the difference based between described expectation rail pressure and the measured value of described rail pressure, calculates the PID controlled quentity controlled variable of controlling described high pressure co-rail system.
According to another embodiment of the present invention, also comprise: rail pressure meadow selector, for selecting described crank angle to arrive region in budc 35-10 degree as the rail pressure meadow of described high pressure co-rail system.
Employing is according to the embodiments of the present invention, can not change under the prerequisite of the existing configuration of high pressure co-rail system as far as possible, in high pressure co-rail system, measure easily and accurately effective rail pressure data, and can realize in the mode that is easy to dispose the rail pressure of controlling in high pressure co-rail system.
Accompanying drawing explanation
Describe in detail by reference to the accompanying drawings and with reference to following, the feature of each mode of execution of the present invention, advantage and other aspects will become more obvious, in the accompanying drawings:
Fig. 1 is schematically illustrated in the plotted curve of the rail pressure signal of actual measurement in high pressure co-rail system;
Fig. 2 has schematically shown according to the rail pressure signal to actual measurement of prior art and has sampled and the plotted curve of the rail pressure signal of filtering;
Fig. 3 has schematically shown and based on crank angle, has measured the flow chart of the method for rail pressure according to one embodiment of the present invention;
Fig. 4 has schematically shown according to flow chart one embodiment of the present invention, choose the method for a plurality of trigger points during the one-period of trigger signal;
Fig. 5 has schematically shown according to the plotted curve of the rail pressure signal of sampling based on crank angle of one embodiment of the present invention;
Fig. 6 has schematically shown sampling and the plotted curve of the rail pressure signal of filtering based on crank angle according to one embodiment of the present invention;
Fig. 7 has schematically shown and based on crank angle, has measured the block diagram of the device of rail pressure according to one embodiment of the present invention;
Fig. 8 has schematically shown and based on crank angle, has measured the specific implementation details of the device of rail pressure according to one embodiment of the present invention;
Fig. 9 has schematically shown a kind of block diagram of controlling the device of rail pressure according to prior art;
Figure 10 has schematically shown the flow chart of controlling the method for rail pressure according to the rail pressure measured value obtaining based on crank angle of one embodiment of the present invention; And
Figure 11 has schematically shown the block diagram of controlling the device of rail pressure according to the rail pressure measured value obtaining based on crank angle of one embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing, describe the embodiments of the present invention in detail.Flow chart in accompanying drawing and block diagram, illustrate according to architectural framework in the cards, function and the operation of the system of the various mode of executions of the present invention, method and computer program product.In this, each square frame in flow chart or block diagram can represent a part for module, block or a code, and a part for described module, block or code comprises one or more for realizing the executable instruction of the logical function of regulation.Also it should be noted that some as alternative realization in, what the function marking in square frame also can be marked to be different from accompanying drawing occurs in sequence.For example, in fact the square frame that two adjoining lands represent can be carried out substantially concurrently, and they also can be carried out by contrary order sometimes, and this determines according to related function.Also be noted that, each square frame in block diagram and/or flow chart and the combination of the square frame in block diagram and/or flow chart, can realize by the special-purpose hardware based system of the function putting rules into practice or operation, or can realize with the combination of specialized hardware and computer order.
Hereinafter, the example by the high pressure co-rail system of only usining in the diesel engine of 4 strokes as applied environment, illustrates and based on crank angle, measures the method for rail pressure according to embodiment of the present invention.Should be appreciated that the present invention can also be applied to have in the high pressure co-rail system of motor of other number of runs.In addition, although in this specification with 6 cylinder engines as a specific example, the method according to this invention and device can also be applied to have in the motor that includes but not limited to 6 cylinders, also can be applied to have in the high pressure co-rail system of motor of other quantity cylinders.
According to an embodiment of the invention, a kind of effective rail pressure value of measuring based on crank angle is also provided, control the method and apparatus of rail pressure.A principle of the present invention is, accurately measure the rail pressure in high pressure co-rail system, and utilize the rail pressure signal of this pin-point accuracy as feed back input PID controller, can greatly improve like this precision of PID control and guarantee stably to provide and the actual rail pressure of expecting that rail pressure matches at motor normal operation period.
Yet in the actual moving process of motor, the rail pressure measured signal of high pressure co-rail system there will be periodic fluctuation, is mainly divided into rail pressure meadow and rail pressure fluctuation district each period of waves.It should be noted that it is significant that rail pressure measured value in rail pressure meadow is controlled for the overall performance of motor, and in working control the rail pressure measured value of not special concern in rail pressure fluctuation district.For simplicity, hereinafter by the rail pressure in rail pressure meadow referred to as effective rail pressure.While measuring effective rail pressure, need to process the data that filter out in rail pressure fluctuation district by filtering, the data that retain in rail pressure meadow are used as further subsequent operation.
Although developed the method for measuring effective rail pressure in prior art, yet in the sampled data of these methods, generally include the noise data that is arranged in a large number rail pressure fluctuation district, due to effective cancelling noise data, thereby the accuracy that causes rail pressure to measure is not high enough.Due to effective rail pressure that can not meet in accurate measurement high pressure co-rail system, the subsequent operation that likely causes accurately controlling rail pressure and keep rail pressure stability.
Referring to Fig. 1, this figure is schematically illustrated in curve Figure 100 of the rail pressure signal of actual measurement in high pressure co-rail system.The rail pressure that it should be noted that actual measurement is by being arranged at the rail pressure value of the real-time sensing of real-time pressure sensor in the common feeder line of high pressure co-rail system.Curve 110 in Fig. 1 is curves of drawing according to the rail pressure value temporal evolution of real-time sensing.The transverse axis of coordinate shown in Fig. 1 represents time shaft, and the longitudinal axis of this coordinate represents rail pressure signal.Shown in Fig. 1, the rail pressure 110 of actual measurement, along with periodically fluctuation up and down of time, and comprises crest (corresponding to rail pressure meadow) and trough (rail pressure fluctuation district) two-part.8 rail pressure fluctuation cycles have been shown in Fig. 1.
Rail pressure meadow is corresponding to the operation interval of non-oil spout in high pressure co-rail system, and in this interval, rail pressure comprises slight fluctuations.And because oil spout causes existing larger fluctuation in rail pressure fluctuation, now fuel oil sprays from the common feeder line of high pressure co-rail system, and build-up of pressure reduces greatly and produced the trough in rail pressure signal.Cycle of this fluctuation is less and belong to high-frequency fluctuation, and can not compensate by rail pressure control.
Fig. 2 has schematically shown according to the rail pressure signal to actual measurement of prior art and has sampled and curve Figure 200 of the rail pressure signal of filtering, wherein shows 8 rail pressure fluctuation cycles.The rail pressure of actual measurement is as shown in curve 210, and the method for measurement of this curve 210 is identical with the method for measurement of the rail pressure 110 of actual measurement in Fig. 1.A plurality of sampled points 220 that represent with " * " in Fig. 2 show the sampling of the rail pressure 210 of actual measurement being carried out based on specified time interval.In Fig. 2 example shown, adopted the mode of sampling based on specified time interval, for example, to sample every 0.001 second, afterwards the sampling rail pressure value of 10 continuous sampling points has been averaging, the cycle that obtains is thus a plurality of sampled points 220 of 0.01 second.
As can be seen from Fig. 2, while sampling rail pressure based on time variable, some in a plurality of sampled points 220 is arranged in rail pressure meadow, and some is arranged in rail pressure fluctuation district.And along with the variation of engine crankshaft rotating speed, in the angle of 0.01 second inside crankshaft rotation process, be different.When speed of crankshaft changes, the rail pressure meadow in each period of waves and rail pressure fluctuation district also can change the corresponding time.Also,, when bent axle is during with rotating speed 1 rotation, if take, within 0.01 second, likely make more sampled point fall into rail pressure meadow during as periodic sampling rail pressure; And when bent axle is during with 2 rotation of another rotating speed, if continue, take 0.01 second as periodic sampling rail pressure, occur possibly that a large amount of sampled points do not press the situation in meadow in-orbit.
It should be noted that, in each period of waves of high pressure co-rail system, rail pressure in rail pressure meadow more can represent for subsequent control and operate significant rail pressure, rail pressure in this interval size has directly related property with the working state of motor, thus belong to that rail pressure is measured and control in need the interval range that is sampled.Yet the signal in rail pressure fluctuation district is the noise signal that can cause rail pressure measurement error, even the rail pressure in this interval is sampled, these samplings also belong to the disallowable abnormal data of needs, thereby should avoid in sampling with in controlling as far as possible.
In addition, this method of sampling based on the time does not have to consider when front pump oil and the oil spout phase place with respect to bent axle, now the position of the rail pressure instantaneous signal point of sampling may appear at the region of rail pressure signal big ups and downs, even if also can draw the wrong conclusion that rail pressure is fluctuating while causing rail pressure signal steady.For example in Fig. 2, curve 230 shows filtered rail pressure curve, for example, because some sampled point (noise samples point 240 and noise samples point 250) is now positioned at rail pressure fluctuation district, cause filtered rail pressure signal also to occur fluctuation, caused sampled result inaccurate.In sampling process, should avoid sampling in rail pressure wave zone.
According to an embodiment of the invention, the rail pressure value of having considered as far as possible to sample in sampling process in rail pressure meadow (is also, rail pressure shown in sample graph 1 is the rail pressure in crest region comparatively stably), and avoid as much as possible the data of sampling in rail pressure fluctuation district (to be also, avoid the rail pressure in the trough environs of the concuss shown in sample graph 1), to reduce, the measured value of rail pressure in high pressure co-rail system is produced and disturbed.
In order more clearly to set forth embodiments of the present invention, sketch now the working procedure of 4 strokes, and analyze rail pressure meadow in high pressure co-rail system and the relation between 4 strokes.For 4 stroke diesel engines, the work of diesel engine is completed by this Four processes of air inlet, compression, burning expansion and exhaust, and this Four processes has formed a work cycle.In a work cycle, crankshaft rotating 720 degree, crank is advanced twice up and down.
1. intake stroke: the task of the trip is to make to be full of in cylinder fresh air.When intake stroke starts, piston is positioned at top dead center.Along with crankshaft rotating, crank makes piston move to lower dead center from top dead center, meanwhile, utilizes the driving mechanism being connected with bent axle to make INO.Along with piston moves downward, the volume above piston increases gradually: cause air pressure in cylinder lower than the pressure in suction tude, so outside air is just constantly filled with cylinder.When piston moves downward while approaching lower dead center, the air-flow that enters cylinder still has very high speed, and inertia is very large, and in order to utilize the inertia of air-flow to improve aeration quantity, suction valve cuts out after piston has been crossed lower dead center.
2. compression stroke: in this trip, piston moves to top dead center from lower dead center, the acting as of this stroke: the temperature that 1) improves air; 2) for gas expansion for doing work creates conditions.After piston stroking upward, suction valve are closed, the air in cylinder is compressed.The temperature of compression terminal is far above the spontaneous ignition temperature of fuel oil, and the fuel oil that is enough to guarantee to spray into cylinder is got angry burning voluntarily.
It should be noted that the fuel oil that sprays into cylinder is not to get angry immediately, and through just getting angry after physicochemical change, during this period of time nearly 0.001-0.005 second, be called delay period of ignition.Therefore, start the fuel oil of atomization to spray into cylinder during to the crank angle of budc 35-10 degree in crankshaft rotating, and when making bent axle After Top Center 5-10 spending, in firing chamber, reach maximum combustion pressure, force piston to move downward.
3. working stroke: the fuel that now major part sprays in firing chamber has all burnt.During burning, emit a large amount of heats, so the just sharply rising of the pressure and temperature of gas, piston moves downward under high temperature and high pressure gas effect, and by crank, bent axle is rotated, externally acting.Descending along with piston, the volume of cylinder increases, the pressure drop of gas, working stroke walks to lower dead center at piston, when outlet valve is opened, finishes.
4. exhaust stroke: the function of exhaust stroke is that the waste gas after expanding is discharged, so that filling fresh air, for the air inlet of next one circulation is prepared.When working stroke piston movement is near lower dead center time, outlet valve opens, and piston, under the drive of crankshaft-and-connecting-rod, is moved to top dead center by lower dead center, and waste gas is discharged outside cylinder.
As from the foregoing, four-journey diesel engine, in a work cycle, only has a stroke acting, and its excess-three stroke is all the auxiliary stroke creating conditions for working stroke.In multicylinder engine, the working stroke of all cylinders does not carry out simultaneously, but has as much as possible an acting interval uniformly.6 Cylinder engines for example, in completing a work cycle, crankshaft rotating two weeks i.e. 720 degree, and every rotation 120 degree of crank angle just have a cylinder acting.Above, referring in the example shown in Fig. 1 and Fig. 2, rail pressure fluctuation cycle is corresponding to the acting of a cylinder in 6 Cylinder engines.Thereby Multi-cylinder engine crankshaft running is evenly, stable working, and can obtain enough large power.
It should be noted that the difference based on motor self-characteristic, the corresponding crank angle range in rail pressure meadow is also not quite similar.Conventionally, when bent axle is near top dead center precontract 35-10 degree and before and after the oil nozzle oil spout, the rail pressure in high pressure co-rail system is the highest and relatively steady, now also in previously described rail pressure meadow.Because rail pressure meadow invariably accompanies, the compression stroke of 4 stroke diesel engine occurs, thereby can design a kind of only tracking and flatten the mechanism that the rail pressure in steady trivial is sampled.Basic principle from diesel engine, when only in each work cycle, crank angle is positioned at special angle in rail pressure meadow (for example, in compression stroke, bent axle is within the scope of budc 35-10 degree) occur, thereby can adopt crank angle as the triggering of sampling rail pressure signal.
Hereinafter, will method and apparatus be according to the embodiment of the present invention described in detail in detail referring to Fig. 3 to Figure 11.Fig. 3 has schematically shown and based on crank angle, has measured the flow chart 300 of the method for rail pressure according to one embodiment of the present invention.In step S302, the actual rail pressure of measuring is in real time carried out to filtering to form input rail pressure.It should be noted that and can obtain the real-time rail pressure signal in high pressure co-rail system by real-time pressure sensor, and adopt for example low-pass filter to filter the noise in real-time rail pressure signal, to form the rail pressure signal to be sampled of input.
In step S304, in predefined crankshaft angle interval, input rail pressure is sampled to form sampled signal.In one embodiment, can the interruption based on crank angle sample.For example, at bent axle, rotate special angle (for example, 6 degree etc.) time samples at every turn.Because bent axle comprises the gear teeth of specific quantity, can also when rotating the gear teeth of specific quantity at every turn, bent axle sample.
For example, for 6 cylinder diesels, crankshaft rotating comprises 3 rail pressure fluctuation cycles for one week, while adopting with crankshaft rotating special angle, triggers sampling, and regardless of speed of crankshaft, the quantity of the sampled point obtaining within a period of waves is all identical.Particularly, in the situation that bent axle comprises 60 gear teeth, if trigger once sampling when 1 gear teeth of the each rotation of bent axle, crankshaft rotating can obtain 60 sampled points (corresponding to 3 rail pressure fluctuation cycles) for one week; If trigger once sampling when 2 gear teeth of the each rotation of bent axle, crankshaft rotating can obtain 30 sampled points (corresponding to 3 rail pressure fluctuation cycles) for one week.
It should be noted that conventionally for the bent axle that comprises 60 gear teeth, in fact this bent axle comprises " 60-2 " also i.e. 58 gear teeth.Two gear teeth that lack can identify beginning and the end position of the each rotation of bent axle.In other specific implementations, hypodontia quantity includes but not limited to 2, but can also have the hypodontia of other quantity.Although it should be noted that in this specification adopt using there are 60 gear teeth bent axle as example, in other alternate embodiment, bent axle can also comprise the gear teeth of other quantity.As long as fix as the angle of swing in sampling interval, in each period of waves, obtain sampled point quantity constant.
In step S306, select to be arranged in the sampled signal of rail pressure meadow of high pressure co-rail system as the feature sampled point of rail pressure.Known for the relation of rail pressure meadow and CAP from the above, for general diesel engine, the rail pressure meadow in high pressure co-rail system arrives the region in budc 35-10 degree corresponding to crank angle.Can be chosen in the numerical value that crank angle arrives the sampled point in budc 35-10 degree inner region, as the feature sampled point of rail pressure.Feature sampled point now can reflect in high pressure co-rail system on the whole for controlling the effective rail pressure value of rail pressure.
By selecting the method for feature sampled point, can fast and effeciently reject rail pressure meadow " noise samples point (example is arranged in the noise samples point 240 and 250 in rail pressure fluctuation district as shown in Figure 2) " in addition, thereby reach the object of Measurement accuracy rail pressure.
Then in step S308, feature sampled point is carried out to filtering to generate the measured value of rail pressure.The feature sampled point of step S306 gained can reflect the rail pressure value in rail pressure meadow preferably, the processing in step S308 further filtering noise sampled point to obtain measured value more accurately.
In one embodiment, in predefined crankshaft angle interval, input rail pressure being sampled to form sampled signal comprises: corner signal is converted to and periodically triggers the trigger signal that input rail pressure is sampled; In response to each trigger point in trigger signal, input rail pressure is sampled.
Due to the gear teeth of crank angle corresponding to specific quantity, can adopt various ways that corner signal is converted to the signal that the gear teeth rotate, and the trigger signal that crankshaft rotating is sampled as triggering through the gear teeth of specific quantity; Or, in the time of can also directly passing through special angle with crankshaft rotating, trigger tracking and compress into row sampling.According to an embodiment of the invention, trigger signal is square signal.For example, can, when gear teeth of the each rotation of bent axle (or rotation is through gear teeth of other quantity), trigger once sampling.Can also adopt square wave for example to describe the rotation of bent axle, for example, the trailing edge (or rising edge) by the starting point of gear teeth of the each rotation of bent axle corresponding to square signal, forms continuous square signal thus.
According to an embodiment of the invention, at least one trigger point can be set in the one-period of square signal.For example, trailing edge that can square signal is set to trigger point, and rising edge that also can square signal is set to trigger point, now, in a square-wave cycle, only once samples.According to an embodiment of the invention, the trailing edge of square signal and rising edge all can also be set to trigger point, now, in a square-wave cycle, carry out double sampling.
For example,, for the bent axle with 60 gear teeth, if when square signal trailing edge (or rising edge) is set for trigger point, crankshaft rotating can obtain 60 sampled points for one week; And when the trailing edge of square wave and rising edge are all set to trigger point, crankshaft rotating can obtain 120 sampled points for one week, now the sampling interval is less.
According to an embodiment of the invention, it is also conceivable that the trigger point that greater number is set in a square-wave cycle.In one embodiment, at least one trigger point being set in the one-period of square signal comprises: timer is set when the cycle of square signal starts; Timer produces and interrupts to generate trigger point, until produced the trigger point of predetermined quantity or the end cycle of square signal within the cycle of square signal with predetermined time interval.
According to a mode of execution, the individual trigger point of N (N is positive integer) is set during can being chosen in a trigger signal cycle T, for example, during a trigger signal cycle, per interval Δ T once samples, to increase the quantity of sampled point.It should be noted that between N and the numerical value of Δ T and the cycle T of trigger signal and should meet following relation:
Δ T * (N-1)≤T formula 1
When the > T of Δ T * (N-1), cannot meet and in a trigger signal cycle T, complete the sampling that N minor tick is Δ T.It should be noted that in addition, when Δ T * (N-1)=T, last sampled point of one-period overlaps with first sampled point in next cycle being close to just.For the ease of calculating, interval delta T is set to be significantly smaller than the numerical value of trigger signal cycle T conventionally.
Referring now to Fig. 4, illustrate how during the square-wave cycle as trigger signal, to select a plurality of trigger points.Fig. 4 has schematically shown according to the flow chart 400 of method one embodiment of the present invention, choose a plurality of trigger points during the one-period of trigger signal.In step S402, first judge whether N (N is positive integer) is more than or equal to 1, if N equals 1, in the one-period of the square wave of trigger signal, only select a trigger point.When N is greater than 1, be illustrated in a plurality of trigger points of the interior selection of one-period of the square wave of trigger signal.
In step S404, in response to receiving crank angle trailing edge, Counter Value=N-1 is set.Then in step S406, the value of carrying out sampling and counter being set subtracts 1, starts afterwards the timer that time-out time is Δ T in step S408, to trigger after through Δ T on carrying out, once samples.In step S410, judge whether the value of this hour counter is greater than 0, if be greater than 0, operation is returned to step S406 to trigger sampling next time; Otherwise EO.By the flow process shown in Fig. 4, can realize and during the trigger signal cycle, choose the method for a plurality of trigger points.
It should be noted that, between method supposition N shown in Fig. 4 and the numerical value of Δ T and the cycle T of trigger signal, meet formula 1, when whether the relation of unknown N, Δ T and T meets formula 1, other stop condition can also be set, for example, while having produced the end cycle of a predetermined quantity N trigger point or square signal within the cycle of square signal, shut-down operation.
Referring to Fig. 5 and Fig. 6 comparison diagram 2, narrate the advantage with respect to prior art according to the method for embodiment of the present invention.Fig. 5 has schematically shown according to the plotted curve 500 of the rail pressure signal of sampling based on crank angle of one embodiment of the present invention.Fig. 5 shows the rail pressure signal in 2 rail pressure fluctuation cycles, and wherein curve 510 is corresponding to corner signal, and sampled point 520 is a plurality of sampled points that obtain when bent axle turns over specific corner.As can be seen from Fig. 5, the cycle of the curve of corner signal 510 is uniformly distributed, although also there is near be positioned at crest rail pressure meadow and near rail pressure fluctuation district trough in the rail pressure curve 530 being formed by connecting by a plurality of sampled points, yet this curve 530 wants much level and smooth with respect to the curve shown in filtered rail pressure 230 in Fig. 2.
Sampled point 520 sampled signal that also step S304 obtains in Fig. 3 in Fig. 5, in subsequent operation, also needs to select the feature sampled point in rail pressure meadow, and the filtering of feature sampled point is drawn to final measurement.With reference now to Fig. 6, describe this process in detail.Fig. 6 has schematically shown sampling and the plotted curve 600 of the rail pressure signal of filtering based on crank angle according to one embodiment of the present invention.Fig. 6 shows 8 rail pressure fluctuation cycles, wherein curve 610 shows the rail pressure curve of actual measurement, a plurality of points 620 that represent with " * " are feature sampled points that selection draws, the filter value that a plurality of points 630 that represent with black round dot are feature sampled points, and curve 640 represents filtered rail pressure curve.
As can be seen from Fig. 6, filtered rail pressure curve 640 is comparatively level and smooth curves, has wherein rejected the noise samples point that is positioned at rail pressure fluctuation district.Thereby result can represent the effective rail pressure in high pressure co-rail system more exactly as shown in Figure 6.Known by comparison diagram 2, the result that same rail pressure fluctuation finally obtains through different processing methods has very large difference, of the present inventionly based on crank angle, measure the rail pressure fluctuation that the method for rail pressure draws and be significantly less than the rail pressure fluctuation based on time sampling, and no matter how rotating speed changes all can obtain comparatively desirable filtering result.This can input data more accurately for follow-up rail pressure PID controls to provide.
Fig. 7 has schematically shown and based on crank angle, has measured the block diagram 700 of the device of rail pressure according to one embodiment of the present invention.As shown in Figure 7, this device comprises: input rail pressure shaper 710, for the actual rail pressure of measuring in real time being carried out to filtering to form input rail pressure; Sampled signal shaper 720, for sampling to form sampled signal in predefined crankshaft angle interval to input rail pressure; Feature Samples selecting device 730, for the sampled signal of rail pressure meadow of selecting to be positioned at high pressure co-rail system as the feature sampled point of rail pressure; Rail pressure signal generator 740, for carrying out filtering to generate the measured value of rail pressure to feature sampled point.And input rail pressure shaper 710, sampled signal shaper 720, feature Samples selecting device 730 are connected successively with rail pressure signal generator 740.
According to an embodiment of the invention, wherein sampled signal shaper 720 can also comprise: trigger signal maker 722, periodically triggers for corner signal is converted to the trigger signal that input rail pressure is sampled; Sampler 724, samples to input rail pressure for each trigger point in response to trigger signal; And trigger point maker 726, at least one trigger point is set in the one-period of square signal.
According to an embodiment of the invention, can also comprise rail pressure meadow selector 750, for selecting crank angle to arrive region in budc 35-10 degree as the rail pressure meadow of high pressure co-rail system, and this rail pressure meadow selector 750 is connected to feature Samples selecting device 730.
According to an embodiment of the invention, wherein trigger signal is square signal.
According to an embodiment of the invention, wherein trigger point is with lower at least one: the rising edge of square signal, the trailing edge of square signal.
According to an embodiment of the invention, the maker of trigger point shown in it comprises: starter, arranges timer while starting for the cycle at square signal; Interrupt maker, for timer, with predetermined time interval, produce and interrupt to generate trigger point, until produced the trigger point of predetermined quantity or the end cycle of square signal within the cycle of square signal.
Fig. 8 has schematically shown and based on crank angle, has measured the specific implementation details 800 of the device of rail pressure according to one embodiment of the present invention.As shown in Figure 8, real-time pressure sensor 802 is for measuring in real time the actual rail pressure of high pressure co-rail system, the first wave filter 804 is for carrying out filtering to form input rail pressure 806 from the actual rail pressure of real-time pressure sensor 802, modular converter 814 is converted to square signal 816 by original crankshaft signal 812, the input rail pressure 806 that A/D converter 808 receives from the first wave filter 804, and square signal 816 conducts that receive from modular converter 814 trigger, by the sampled data input buffer 810 based on square wave 816 samplings, equalizer 820 is converted to sampled signal by the data from buffer storage 810, selector 824 generates and interrupts based on specific crank angle, and the sampled signal of rail pressure meadow of selecting to be positioned at high pressure co-rail system is as the feature sampled point of rail pressure, and the second 826 pairs, wave filter carries out filtering from the feature sampled point of the rail pressure of selector 824, to generate the measured value 828 of rail pressure.
Although show in detail a kind of specific implementation details of measuring the device of rail pressure in high pressure co-rail system based on crank angle in Fig. 8, it should be noted that, this illustrates is only a specific embodiment of the present invention, and unit, module, assembly, circuit that can also adopt other etc. realized other mode of executions of the present invention.
How to illustrate in detail hereinbefore the crank angle based in high pressure co-rail system, carried out the more convenient method and apparatus that obtains exactly rail pressure in high pressure co-rail system.And as described above, common rail pressure has not only determined the height of injection pressure, and be the important parameter of oil spout metering, its stability and transient response directly affect the performances such as engine start, idling, acceleration.So guarantee accurately to rail pressure signal sample, filtering and control significant.Now how explanation is adopted to the rail pressure measured value obtaining based on crank angle, in high pressure co-rail system, control the method and apparatus of rail pressure.
Referring to Fig. 9, this figure schematically shows a kind of block diagram 900 of controlling the device of rail pressure according to prior art.In the prior art, conventionally adopt the PID of rail pressure to control to realize acquisition and the stable actual rail pressure of expecting that rail pressure matches.
For the sake of simplicity, at this, only sketch the principle that PID controls.PID is ratio (P), integration (I), differential (D) control algorithm, but is not to possess this three kinds of algorithms simultaneously, can only possess one of them or polyalgorithm.Ratio (P), integration (I), differential (D) control algorithm respectively have effect: basic (current) deviation e (t) of ratio reaction system; The Accumulated deviation of integration reaction system; Variance ratio e (the t)-e (t-1) of differential reflection system deviation signal.Pid algorithm is a closed loop control algorithm, thereby must on hardware, have closed loop control when realizing, and also forms feedback.For example, for high pressure co-rail system, if need to control the rail pressure in high pressure co-rail system, the measuring device of measuring actual rail pressure just need to be set, and by measurement feedback to controlling on route.
As shown in Figure 9, in whole operating process, control signal forms a loop: PID controller 910 receives expectation rail pressure (as shown by arrow A) and actual rail pressure (as shown by arrow B), after the processing through PID controller 910, export controlled quentity controlled variable (as shown by arrow C), the signal that controlled quentity controlled variable now not can directly be processed by common rail system 930, and be only the control signal being associated with reality output rail pressure; This controlled quentity controlled variable, after the processing of overdrive circuit 920, can be converted to the discernible driving signal of common rail system 930 (as shown by arrow D); This driving signal is transfused in common rail system 930 then for driving in a usual manner common rail system 930 to form actual rail pressure (as shown by arrow E); Because PID controls, be that a kind of loop is controlled, actual rail pressure is after time-based sampling apparatus 940 is sampled, and the input end that the measurement rail pressure that sampling draws is transfused to again PID controller 910 feeds back.
Yet, the input that PID as shown in Figure 9 controls is the difference of expectation rail pressure and actual rail pressure, when time-based sampling apparatus 940 has been introduced in rail pressure fluctuation district the uncontrollable pressure surge information of jiggly transient state in sampling, can cause originally stable rail pressure to produce larger fluctuation, PID controller will produce Redundant Control, affects the precision of rail pressure control.
According to an embodiment of the invention, a kind of method of controlling rail pressure in high pressure co-rail system has been proposed, the method adopt above referring to Fig. 1 to Fig. 8, describe in high pressure co-rail system, based on crank angle, measure the method and apparatus of rail pressure, measure the rail pressure in high pressure co-rail system, and the measurement rail pressure of acquisition is fed back to the input end of PID controller, to realize the accurate control to rail pressure.
Figure 10 has schematically shown the flow chart 1000 of controlling the method for rail pressure according to the rail pressure measured value obtaining based on crank angle of one embodiment of the present invention.As shown in figure 10, first will carry out the step (yet, step S1002 to S1008 as included in block diagram 1010) of the rail pressure measured value obtaining based on crank angle, this step, with above step shown in Figure 3 is similar, does not repeat them here.
Then,, in step S1010 to S1012, based on rail pressure measured value, generate and calculate the PID controlled quentity controlled variable of controlling high pressure co-rail system.As shown in step S1010, the expectation rail pressure of high pressure co-rail system is set.The expectation rail pressure is here the final rail pressure that final hope obtains in high pressure co-rail system, and due to reasons such as the own states of high pressure co-rail system, need to utilize the measured value of rail pressure to carry out circuit controls when real work.In step S1012, the difference based between expectation rail pressure and the measured value of rail pressure, calculates the PID controlled quentity controlled variable of controlling high pressure co-rail system.
According to an embodiment of the invention, the method of rail pressure of measuring based on crank angle in high pressure co-rail system as shown in Figure 10 Block Diagrams 1010, can adopt the above described any means based on crank angle measurement rail pressure to realize, and those skilled in the art can be based on high pressure co-rail system different qualities and state, select and/or combine above-mentioned for measure part and/or whole features of the method for rail pressure based on crank angle.
According to an embodiment of the invention, the method also comprises: PID controlled quentity controlled variable is used for to high pressure co-rail system, to form controlled actual rail pressure; Actual rail pressure using controlled actual rail pressure as real-time measurement is fed back and is formed loop.According to an embodiment of the invention, wherein PID controlled quentity controlled variable is used for to high pressure co-rail system, to form controlled actual rail pressure, comprise: PID controlled quentity controlled variable is converted to driving amount through drive circuit, for driving high pressure co-rail system to obtain controlled actual rail pressure.
According to an embodiment of the invention, a kind of device of controlling rail pressure in high pressure co-rail system is provided, comprising: measuring appliance, for measuring rail pressure based on crank angle; And PID controller, for based on rail pressure measured value, generate and calculate the PID controlled quentity controlled variable of controlling high pressure co-rail system.
Wherein measuring appliance comprises: input rail pressure shaper, for the actual rail pressure of measuring in real time being carried out to filtering to form input rail pressure; Sampled signal shaper, for sampling to form sampled signal in predefined crankshaft angle interval to input rail pressure; Feature Samples selecting device, for the sampled signal of rail pressure meadow of selecting to be positioned at high pressure co-rail system as the feature sampled point of rail pressure; Rail pressure signal generator, for carrying out filtering to generate the measured value of rail pressure to feature sampled point.Wherein PID controller comprises: device is set, the expectation rail pressure of high pressure co-rail system is set; Controlled quentity controlled variable calculator, for the difference based between expectation rail pressure and the measured value of rail pressure, calculates the PID controlled quentity controlled variable of controlling high pressure co-rail system.
It should be noted that according to an embodiment of the invention, measuring appliance can adopt above the described any device of measuring rail pressure based on crank angle in high pressure co-rail system to realize, for example, adopt with reference to the device described in figure 7 and Fig. 8 and realize.And those skilled in the art can be based on high pressure co-rail system different qualities and state, select and/or combine above-mentioned for measure part and/or whole features of the device of rail pressure based on crank angle.
According to an embodiment of the invention, PID controlled quentity controlled variable is input to high pressure co-rail system, to form controlled actual rail pressure; Controlled actual rail pressure is used as the actual rail pressure of real-time measurement and feeds back formation loop.According to an embodiment of the invention, also comprise: drive circuit, for PID controlled quentity controlled variable is converted to driving amount, for driving high pressure co-rail system to obtain controlled actual rail pressure.
Referring now to Figure 11, be described in further detail the specific implementation according to device of the present invention, Figure 11 has schematically shown the block diagram 1100 of controlling the device of rail pressure according to the rail pressure measured value obtaining based on crank angle of one embodiment of the present invention.In whole operating process, control signal forms a loop: PID controller 1110 receives expectation rail pressure (as shown by arrow A) and actual rail pressure (as shown by arrow B), after the processing through PID controller 1110, export controlled quentity controlled variable (as shown by arrow C), controlled quentity controlled variable now can be not only the control signal being associated with reality output rail pressure by the direct signal of processing of common rail system 1130; This controlled quentity controlled variable, after the processing of overdrive circuit 1120, can be converted to the discernible driving signal of common rail system 1130 (as shown by arrow D); This driving signal is transfused in common rail system 1130 then for driving in a usual manner common rail system 1130 to form actual rail pressure (as shown by arrow E); Because PID controls, be that a kind of loop is controlled, actual rail pressure is after the sampling apparatus 1140 through based on crank angle is sampled, and the input end that the measurement rail pressure that sampling draws is transfused to again PID controller 1110 feeds back.
Because the sampling apparatus based on crank angle 940 now can not introduced the pressure surge information in rail pressure fluctuation district in sampling, thereby under the control of PID controller, through the high pressure co-rail system of feedback control, can export the rail pressure stably closer to expectation rail pressure, PID controller produces accurate controlled quentity controlled variable to improve the precision of rail pressure control.
It should be noted that, the meaning of term " connection ", " coupling " or its any variant is direct between two or more elements or indirectly any connection or coupling, and can contain the situation that has one or more intermediary element between " connection " or " coupling " two elements together.Coupling between element or connection can be physics, logic or its combination.As used herein, by using one or more wires, cable and/or printed circuit to connect, and by use electromagnetic energy (such as, there is the electromagnetic energy as the wavelength in radio frequency non-limiting but not exhaustive examples region, in microwave region and light (visible and invisible the two) region), two elements can be considered as to " connection " or " coupling " together.
The present invention can take hardware implementation mode, implement software mode or the form of the mode of execution that not only comprised nextport hardware component NextPort but also comprised component software.In a preferred embodiment, the present invention is embodied as software, and it includes but not limited to firmware, resident software, microcode etc.
Benefit from the instruction presenting in aforementioned description and associated drawings, embodiment of the present invention those skilled in the art can expect other mode of executions of the present invention and a lot of improvement.Therefore, should be appreciated that embodiments of the present invention are not limited to disclosed specific implementations, and modification is intended to be included in the scope of claims with other mode of executions.And, although above description and association service have been described illustrative embodiments in the context of some example combinations of element and/or function, but be to be understood that, do not departing under the prerequisite of claims scope, alternate embodiment can provide the various combination of element and/or function.With regard to this point, for example, can expect the element of explicit description above and/or the various combination of function, and be documented in some of claims.Although used particular term at this, only aspect universal description, use these terms, rather than for restriction.
Claims (16)
1. in high pressure co-rail system, control a method for rail pressure, comprising:
-based on crank angle, obtain rail pressure measured value, comprising:
The actual rail pressure of measuring is in real time carried out to filtering to form input rail pressure;
In a period of rotation of described crank angle, in predefined crankshaft angle interval, described input rail pressure is sampled to form sampled signal;
Selection is positioned at the described sampled signal of rail pressure meadow of described high pressure co-rail system as the feature sampled point of described rail pressure;
Described feature sampled point is carried out to filtering to generate the measured value of described rail pressure;
-based on described rail pressure measured value, generate and calculate the PID controlled quentity controlled variable of controlling described high pressure co-rail system, comprising:
The expectation rail pressure of described high pressure co-rail system is set;
Difference based between described expectation rail pressure and the measured value of described rail pressure, calculates the PID controlled quentity controlled variable of controlling described high pressure co-rail system;
Rail pressure meadow in wherein said high pressure co-rail system arrives the region in budc 35-10 degree corresponding to described crank angle.
2. method according to claim 1, wherein in predefined crankshaft angle interval, described input rail pressure is sampled to form sampled signal and comprise:
Corner signal is converted to and periodically triggers the trigger signal that described input rail pressure is sampled;
In response to each trigger point in described trigger signal, described input rail pressure is sampled.
3. method according to claim 2, wherein said trigger signal is square signal.
4. method according to claim 3 arranges at least one trigger point in the one-period of described square signal.
5. method according to claim 4, wherein said trigger point is with lower at least one: the rising edge of described square signal, the trailing edge of described square signal.
6. method according to claim 4 wherein arranges at least one trigger point and comprises in the one-period of described square signal:
Timer when starting, is set in the described cycle of described square signal;
Described timer produces and interrupts to generate trigger point, until produced the trigger point of predetermined quantity or the described end cycle of described square signal within the described cycle of described square signal with predetermined time interval.
7. according to the method described in any one in claim 1 to 6, also comprise:
Described PID controlled quentity controlled variable is used for to described high pressure co-rail system, to form controlled actual rail pressure;
Using described controlled actual rail pressure as the actual rail pressure of described real-time measurement, feed back and form loop.
8. method according to claim 7, is wherein used for described high pressure co-rail system by described PID controlled quentity controlled variable, to form controlled actual rail pressure, comprises:
Described PID controlled quentity controlled variable is converted to driving amount through drive circuit, for driving described high pressure co-rail system to obtain controlled actual rail pressure.
9. in high pressure co-rail system, control a device for rail pressure, comprising:
-measuring appliance, for measuring rail pressure based on crank angle, comprising:
Input rail pressure shaper, for carrying out the actual rail pressure of measuring in real time filtering to form input rail pressure;
Sampled signal shaper, for a period of rotation at described crank angle, samples to form sampled signal in predefined crankshaft angle interval to described input rail pressure;
Feature Samples selecting device, for the described sampled signal of rail pressure meadow of selecting to be positioned at described high pressure co-rail system as the feature sampled point of described rail pressure;
Rail pressure signal generator, for carrying out filtering to generate the measured value of described rail pressure to described feature sampled point;
-PID controller, for based on described rail pressure measured value, generates and calculates the PID controlled quentity controlled variable of controlling described high pressure co-rail system, comprising:
Device is set, the expectation rail pressure of described high pressure co-rail system is set;
Controlled quentity controlled variable calculator, for the difference based between described expectation rail pressure and the measured value of described rail pressure, calculates the PID controlled quentity controlled variable of controlling described high pressure co-rail system; And
-rail pressure meadow selector, for selecting described crank angle to arrive region in budc 35-10 degree as the rail pressure meadow of described high pressure co-rail system.
10. device according to claim 9, wherein said sampled signal shaper comprises:
Trigger signal maker, periodically triggers for corner signal is converted to the trigger signal that described input rail pressure is sampled;
Sampler, samples to described input rail pressure for each trigger point in response to described trigger signal.
11. devices according to claim 10, wherein said trigger signal is square signal.
12. devices according to claim 11, wherein said sampled signal shaper also comprises:
Trigger point maker, for arranging at least one trigger point in the one-period of described square signal.
13. devices according to claim 12, wherein said trigger point is with lower at least one: the rising edge of described square signal, the trailing edge of described square signal.
14. devices according to claim 13, wherein said trigger point maker comprises:
Starter, arranges timer while starting for the described cycle at described square signal;
Interrupt maker, for described timer, with predetermined time interval, produce and interrupt to generate trigger point, until produced the trigger point of predetermined quantity or the described end cycle of described square signal within the described cycle of described square signal.
15. according to the device described in any one in claim 9 to 14, wherein:
Described PID controlled quentity controlled variable is input to described high pressure co-rail system, to form controlled actual rail pressure;
The actual rail pressure that described controlled actual rail pressure is used as described real-time measurement is fed back and is formed loop.
16. devices according to claim 15, also comprise:
Drive circuit, for described PID controlled quentity controlled variable is converted to driving amount, for driving described high pressure co-rail system to obtain controlled actual rail pressure.
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| CN102425503B (en) * | 2011-09-22 | 2013-10-09 | 中国汽车技术研究中心 | Rail pressure pre-control system based on hardware constant-current control and control method |
| CN104213997B (en) * | 2014-07-31 | 2016-08-24 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Pressure control of common rail system method |
| CN106499537A (en) * | 2016-12-31 | 2017-03-15 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of pid parameter self-adjusting control of common rail for diesel engine pressure and device |
| US10648385B2 (en) | 2018-02-07 | 2020-05-12 | Tenneco Automotive Operating Company Inc. | Diesel exhaust fluid pressure measuring and control systems and methods |
| CN108894885B (en) * | 2018-07-18 | 2020-09-01 | 常州易控汽车电子股份有限公司 | Device and method for identifying opening state of pressure release valve for common rail system of diesel engine |
| CN110080890A (en) * | 2019-05-21 | 2019-08-02 | 车行天下网络科技股份有限公司 | The automobile sub-controlling unit compared based on rail pressure signal |
| CN110185547A (en) * | 2019-06-24 | 2019-08-30 | 苏州国方汽车电子有限公司 | A kind of rail pressure control system |
| CN110821696B (en) * | 2019-11-21 | 2022-05-03 | 南京邮电大学 | Method for controlling oil pressure of high-pressure oil pipe of engine |
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