CN202091080U - Device for diagnosing faults in the high-pressure co-rail system of engine - Google Patents
Device for diagnosing faults in the high-pressure co-rail system of engine Download PDFInfo
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- CN202091080U CN202091080U CN2011200353611U CN201120035361U CN202091080U CN 202091080 U CN202091080 U CN 202091080U CN 2011200353611 U CN2011200353611 U CN 2011200353611U CN 201120035361 U CN201120035361 U CN 201120035361U CN 202091080 U CN202091080 U CN 202091080U
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Abstract
The utility model relates to a device for diagnosing faults in the high-pressure co-rail system of an engine, specifically, the device includes a cylinder cut-off controller which cuts off at least one cylinder of the engine by means of a separation cylinder technology; a measurer which measures the rail pressure in the high-pressure co-rail system after the cylinder is cut off based on crankshaft corner, and further includes an input rail pressure which filters the real-time measured actual rail pressure to form input rail pressure; a sampling signal former which samples the input rail pressure at the predetermined interval of the crankshaft corner to form sampling signals; a characteristic sampling points selector which selects the sampling signals in the stable area of the rail pressure in the high-pressure co-rail system to be used as characteristic sampling points; rail pressure signal generator which filters the characteristic sampling points to generate the rail pressure after the cut-off of the cylinder; and a determining device which calculates the difference of the rail pressure after the cut-off of the cylinder and the factory rail pressure and determines that the high-pressure co-rail system has faults when the difference value is higher than the preset valve value.
Description
Technical field
Each mode of execution of the present utility model relates to engine art, and more specifically, relates to a kind of fault of the high pressure co-rail system that is used for diagnosing motor and the device of calibrating this fault.
Background technique
High pressure co-rail system is a kind of oil supply system that is used for diesel engine.This system can be completely separate from each other with the generation and the course of injection of jet pressure in the closed-loop system that high pressure oil pump, real-time pressure sensor and electronic control unit are formed.It is by high pressure oil pump high pressure fuel to be transported in the common feeder line, realize accurate control by the pressure in the real-time pressure sensor measurement common feeder line, make that the pressure size in the common feeder line is irrelevant with the rotating speed of motor, thereby reduce the degree of the interior pressure of diesel engine common feeder line significantly with engine speed change.
The fuel injection quantity of electronic control unit controls oil sprayer, fuel injection quantity size depend on the length of common feeder line pressure and solenoid valve unlatching time.Usually, the pressure in the common feeder line is called common rail pressure, perhaps abbreviates rail pressure as.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 influence performances such as engine start, idling, acceleration.So guarantee accurately to the rail pressure signal sample, filtering and control is significant.
In the high pressure co-rail system, electric-controlled fuel injector and high pressure oil pump are important power units, the accurate control of fuel injection quantity and pump oil mass has significant effects to the power character and the Economy of motor, and the aging of power unit is the principal element that influences fuel injection quantity and pump oil mass.Under the aging gradually situation of power unit, continue the parameter control fuel injection quantity and the pump oil mass that are provided with when dispatching from the factory with motor, can cause the rail pressure in the high pressure co-rail system can not reach the rail pressure of expection usually, and then cause harmful effect such as engine efficiency reduction.
Do not realize in present most motor compensating to final controlling element is aging; Even compensate, usually also be to adopt that to add with time be that the compensation rate of variable is calibrated the parameter of dispatching from the factory.Although this compensation rate is to be the function of variable with time, yet this function is not considered other material elementses aging with motor self power unit and that wearing and tearing are associated, thereby this compensation can only be rough compensation.Obtain if desired and the match compensating parameter of effect of actual conditions, then need regularly to detect and compensate based on the current state of power unit to the maintenance station.
The model utility content
Therefore, under the prerequisite that does not as far as possible change the existing configuration of high pressure co-rail system, how to realize conveniently diagnosing exactly the fault (for example, aging and wearing and tearing) in the high pressure co-rail system and the corresponding compensation parameter is set, then become a problem demanding prompt solution.For this reason, the utility model provides a kind of method and apparatus of diagnosing the fault in the high pressure co-rail system and corresponding compensating parameter is set in engine operation process.
According to a mode of execution of the present utility model, the method for the fault in a kind of high pressure co-rail system of diagnosing motor is provided, comprising:
-adopt to divide cylinder technology with the cylinder that breaks of at least one cylinder in the motor;
-measure the rail pressure in the high pressure co-rail system behind the disconnected cylinder based on crank angle, comprising: the actual rail pressure that will measure is in real time carried out filtering to form the input rail pressure; In predefined crankshaft angle interval the input rail pressure is sampled to form sampled signal; Selection is positioned at the sampled signal of rail pressure meadow of high pressure co-rail system as the feature sampled point of rail pressure; The feature sampled point is carried out filtering to generate the rail pressure behind the disconnected cylinder;
-ask for the rail pressure difference of rail pressure and the rail pressure of dispatching from the factory behind the disconnected cylinder, when difference is higher than predetermined threshold, judge that then there is fault in high pressure co-rail system.
According to another mode of execution of the present utility model, wherein the rail pressure meadow in the high pressure co-rail system is corresponding to the zone in the crank angle arrival budc 35-10 degree.
According to another mode of execution of the present utility model, also comprise: if there is fault in high pressure co-rail system, then the compensation of fuel injection quantity that will be associated with the rail pressure difference and pump oil mass is to dispatch from the factory fuel injection quantity and pump oil mass, with the calibration fault.
According to another mode of execution of the present utility model, the device of the fault in a kind of high pressure co-rail system of diagnosing motor is provided, it is characterized in that comprising:
-disconnected cylinder controller is used for adopting the branch cylinder technology with at least one cylinder of motor cylinder that breaks;
-measuring appliance is used for measuring based on crank angle the rail pressure of high pressure co-rail system behind the disconnected cylinder, and comprising: the input rail pressure forms device, is used for the actual rail pressure of measuring is in real time carried out filtering to form the input rail pressure; Sampled signal forms device, is used in predefined crankshaft angle interval the input rail pressure being sampled to form sampled signal; Feature sampled point selector, the sampled signal of rail pressure meadow that is used to select to be positioned at high pressure co-rail system is as the feature sampled point of rail pressure; The rail pressure signal generator is used for the feature sampled point is carried out filtering to generate the rail pressure behind the disconnected cylinder;
-determining device is used to ask for the rail pressure difference of rail pressure and the rail pressure of dispatching from the factory behind the disconnected cylinder, and when difference is higher than predetermined threshold, judges that there is fault in high pressure co-rail system.
According to another mode of execution of the present utility model, it is characterized in that also comprising: rail pressure meadow selector is used for selecting crank angle to arrive the rail pressure meadow of the interior zone of budc 35-10 degree as high pressure co-rail system.
According to another mode of execution of the present utility model, it is characterized in that also comprising: calibrator, there is fault if be used for high pressure co-rail system, then the compensation of fuel injection quantity that will be associated with the rail pressure difference and pump oil mass is to dispatch from the factory fuel injection quantity and pump oil mass, with the calibration fault.
Employing is according to each mode of execution of the present utility model, can be under the prerequisite that does not as far as possible change the existing configuration of high pressure co-rail system, in high pressure co-rail system, diagnose the fault in the high pressure co-rail system easily and accurately and corresponding compensating parameter is set, and can realize the configuration of high pressure co-rail system in the mode that is easy to dispose.
Description of drawings
Also with reference to following detailed description, the feature of each mode of execution of the utility model, advantage and other aspects will become more obvious in conjunction with the accompanying drawings, in the accompanying drawings:
Fig. 1 is schematically illustrated in the plotted curve of the rail pressure signal of actual measurement in the 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 has measured the flow chart of the method for rail pressure according to a mode of execution of the utility model based on crank angle;
Fig. 4 has schematically shown according to a flow chart mode of execution of the utility model, choose the method for a plurality of trigger points during the one-period of trigger signal;
Fig. 5 has schematically shown the plotted curve according to the rail pressure signal of sampling based on crank angle of a mode of execution of the utility model;
Fig. 6 has schematically shown sampling and the plotted curve of the rail pressure signal of filtering based on crank angle according to a mode of execution of the utility model;
Fig. 7 has schematically shown and has measured the block diagram of the device of rail pressure according to a mode of execution of the utility model based on crank angle;
Fig. 8 has schematically shown and has measured the specific implementation details of the device of rail pressure according to a mode of execution of the utility model based on crank angle;
Fig. 9 has schematically shown the flow chart according to the method for the fault in the high pressure co-rail system of the diagnosis motor of a mode of execution of the utility model;
Figure 10 has schematically shown according to the rail pressure waveform behind the disconnected cylinder of a mode of execution of the utility model;
Figure 11 has schematically shown the realization block diagram according to the disconnected cylinder scheduler of a mode of execution of the utility model; And
Figure 12 has schematically shown the block diagram according to fault in the high pressure co-rail system of the diagnosis motor of a mode of execution of the utility model and the device calibrated.
Embodiment
Describe each mode of execution of the present utility model in detail below with reference to accompanying drawing.Flow chart in the accompanying drawing and block diagram illustrate the system according to the various mode of executions of the utility model, architectural framework in the cards, function and the operation of method and computer program product.In this, each square frame in flow chart or the block diagram can be represented the part of module, block or a code, and the part of described module, block or code comprises one or more executable instructions that are used to realize the logical function stipulated.Also should be noted that some as alternative realization in, what the function that is marked in the square frame also can be marked to be different from the accompanying drawing occurs in sequence.For example, in fact the square frame that two adjoining lands are represented can be carried out substantially concurrently, and they also can be carried out by opposite order sometimes, and this decides according to related function.Also be noted that, each square frame in block diagram and/or the flow chart and the combination of the square frame in block diagram and/or the flow chart, can realize with the hardware based system of the special use of function that puts rules into practice or operation, perhaps can realize with the combination of specialized hardware and computer order.
Hereinafter,, illustrate and measure the method for rail pressure based on crank angle with the example of the high pressure co-rail system in the diesel engine of 4 strokes only according to the utility model mode of execution as applied environment.Should be appreciated that the utility model 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, can also be applied to have in the motor that includes but not limited to 6 cylinders according to method and apparatus of the present utility model, also promptly can be applied to have in the high pressure co-rail system of motor of other quantity cylinders.
The utility model provides a kind of can diagnose and calibrate the method and apparatus of fault in the motor normal course of operation.This method is measured the rail pressure signal behind the disconnected cylinder, and measured value and factory-said value is compared by dividing cylinder technology, when difference is higher than the predefine threshold value, judges that then there is fault in high pressure co-rail system.In another embodiment, if there is fault in high pressure co-rail system, then the compensation of fuel injection quantity that will be associated with the rail pressure difference and pump oil mass is to dispatch from the factory fuel injection quantity and pump oil mass, with the calibration fault.
Because dividing cylinder and disconnected cylinder is to carry out in engine operation process, the rail pressure signal behind the disconnected cylinder of measuring this moment can truly reflect the influence of the aging and wearing and tearing of power units such as oil sprayer and oil pump for the rail pressure signal.Thereby, just can judge whether high pressure co-rail system exists fault based on the size of this rail pressure signal by the rail pressure signal behind the disconnected cylinder of accurate measurement.
A prerequisite of the present utility model is, need accurately measure the rail pressure behind the disconnected cylinder in the high pressure co-rail system.Yet in the actual moving process of motor, periodic fluctuation can appear in the rail pressure measured signal of high pressure co-rail system, mainly is divided into rail pressure meadow and rail pressure wave zone each period of waves.Should be noted that the rail pressure measured value that is in the rail pressure meadow is significant for the overall performance control of motor, and not special concern is in rail pressure measured value in the rail pressure wave zone in working control.For for simplicity, the rail pressure that will be in hereinafter in the rail pressure meadow abbreviates effective rail pressure as.When measuring effective rail pressure, need filter out data in the rail pressure wave zone, keep data in the rail pressure meadow as further subsequent operation by Shelving.
In according to method and apparatus of the present utility model, have only effective rail pressure of accurately measuring in the high pressure co-rail system, just might realize follow-up diagnosis and calibration operation.Although developed the method for measuring effective rail pressure in the prior art, yet generally include the noise data that is arranged in the rail pressure wave zone in a large number in the sampled data of these methods, because effective cancelling noise data, thereby cause the accuracy of rail pressure measurement not high enough.Owing to can not satisfy the effective rail pressure in the accurate measurement high pressure co-rail system, the subsequent operation that might cause accurately to control rail pressure and keep rail pressure stability.
The utility model provides a kind of and has measured the method for rail pressure in the high pressure co-rail system based on crank angle, and in mode of execution of the present utility model, adopts the rail pressure in the high pressure co-rail system after this method is measured disconnected cylinder.Hereinafter, will how to realize measuring rail pressure in the high pressure co-rail system referring to Fig. 1 to Fig. 8 explanation based on crank angle.
Referring to Fig. 1, this figure is schematically illustrated in curve Figure 100 of the rail pressure signal of actual measurement in the high pressure co-rail system.The rail pressure that should be noted that actual measurement is the rail pressure value by the real-time sensing of real-time pressure sensor in the common feeder line that is arranged at high pressure co-rail system.Curve 110 among Fig. 1 is to change in time and the curve drawn according to the real-time rail pressure value of sensing.The transverse axis express time axle of coordinate shown in Fig. 1, the longitudinal axis of this coordinate is represented the rail pressure signal.From shown in Fig. 1 as seen, the rail pressure 110 of actual measurement is along with the fluctuation up and down of time cycle property ground, and comprises crest (corresponding to the rail pressure meadow) and trough (rail pressure wave zone) two-part.Have been shown among Fig. 18 rail pressure periods of waves.
The rail pressure meadow is corresponding to the operation interval of non-oil spout in the high pressure co-rail system, and rail pressure comprises slight fluctuations in this interval.And because oil spout causes existing in rail pressure fluctuation than great fluctuation process, this moment, fuel oil sprayed from the common feeder line of high pressure co-rail system, and build-up of pressure reduces greatly and produced trough in the rail pressure signal.The 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 periods of waves.The rail pressure of actual measurement is shown in curve 210, and the method for measurement of the rail pressure 110 of actual measurement is identical among the method for measurement of this curve 210 and Fig. 1.A plurality of sampled points 220 with " * " expression among Fig. 2 show the sampling of the rail pressure 210 of actual measurement being carried out based on specified time interval.Adopted the mode of sampling based on specified time interval in the example shown in Figure 2, for example to sample every 0.001 second, afterwards the sampling rail pressure value of 10 continuous sampling points has been asked on average, the cycle that obtains thus is a plurality of sampled points 220 of 0.01 second.
As can be seen from Fig. 2, when sampling rail pressure based on time variable, some in a plurality of sampled points 220 is arranged in the rail pressure meadow, and some then is arranged in the rail pressure wave zone.And, be different in the angle of 0.01 second inside crankshaft rotation process along with the engine crankshaft change in rotational speed.When speed of crankshaft changed, rail pressure meadow and pairing time of rail pressure wave zone in each period of waves also can change.Also promptly, when bent axle during, if might make more sampled point fall into the rail pressure meadow when being the periodic sampling rail pressure with 0.01 second with rotating speed 1 rotation; And when bent axle rotates with another rotating speed 2, if continuation was the periodic sampling rail pressure with 0.01 second, the not situation in the rail pressure meadow of a large amount of sampled points appears possibly then.
It should be noted that, in each period of waves of high pressure co-rail system, rail pressure in the rail pressure meadow more can be represented for subsequent control and operate significant rail pressure, rail pressure size in this is interval has directly related property with the working state of motor, thereby belongs to rail pressure and need the interval range that is sampled in measuring and controlling.Yet the signal in the rail pressure wave zone is the noise signal that can cause the 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 and control 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, the position of the rail pressure instantaneous signal point of this moment sampling may appear at the zone of rail pressure signal big ups and downs, even also can draw the wrong conclusion that rail pressure is fluctuating when causing the rail pressure signal steady.For example curve 230 shows filtered rail pressure curve among Fig. 2, because some sampled point this moment (for example noise samples point 240 and noise samples point 250) is positioned at the rail pressure wave zone, cause filtered rail pressure signal fluctuation also to occur, caused sampled result inaccurate.In sampling process, should avoid in the rail pressure wave zone, sampling.
According to a mode of execution of the present utility model, the rail pressure value of having considered as far as possible to sample in sampling process in the rail pressure meadow (also is, the rail pressure shown in Figure 1 of sampling is the rail pressure in the crest zone comparatively stably), and the data in the rail pressure wave zone of avoiding as much as possible sampling (also are, avoid sampling rail pressure in the trough environs of concuss shown in Figure 1), produce and disturb so that reduce measured value to rail pressure in the high pressure co-rail system.
In order more clearly to set forth mode of execution of the present utility model, sketch the working procedure of 4 strokes now, and analyze rail pressure meadow in the high pressure co-rail system and the relation between 4 strokes.For 4 stroke diesel engines, the work of diesel engine is finished by these four processes of air inlet, compression, burning expansion and exhaust, and these four processes have constituted a work cycle.In a work cycle, crankshaft rotating 720 degree, crank is advanced up and down twice.
1. intake stroke: the task of the trip is to make to be full of fresh air in the cylinder.When intake stroke began, piston was positioned at top dead center.Along with crankshaft rotating, crank makes piston move to lower dead center from top dead center, simultaneously, utilizes the driving mechanism that links to each other with bent axle to make INO.Along with piston moves downward, the volume above the piston increases gradually: cause the air pressure in the cylinder to be lower than the interior pressure of suction tude, so outside air just constantly charges into cylinder.When piston moved downward near lower dead center, the air-flow that enters cylinder still had very high speed, and inertia is very big, and for the inertia that utilizes air-flow improves aeration quantity, suction valve has crossed lower dead center at piston and cut out later on.
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) create conditions for gas expansion for doing work.After piston stroking upward, suction valve were closed, the air in the cylinder was compressed.The temperature of compression terminal point 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.
Should be noted that the fuel oil that sprays into cylinder is not to get angry immediately, and through just getting angry after the physicochemical change, nearly during this period of time 0.001-0.005 second, be called delay period of ignition.Therefore, when the crank angle of crankshaft rotating 35-10 degree to top dead center, begin will atomizing fuel oil spray into cylinder, and when making bent axle After Top Center 5-10 spending, in the firing chamber, reach maximum combustion pressure, force piston to move downward.
3. working stroke: the fuel that this moment, major part sprayed in the firing chamber has all burnt.Emit a large amount of heats during burning, so the just sharply rising of the pressure and temperature of gas, piston moves downward under the 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, and the pressure of gas descends, and working stroke walks to lower dead center at piston, finishes when outlet valve is opened.
4. exhaust stroke: the function of exhaust stroke is that the waste gas after expanding is discharged, so that the filling fresh air, for next circuit air inlet is prepared.When the working stroke piston motion was near lower dead center, outlet valve opened, and piston is moved to top dead center by lower dead center under the drive of crankshaft-and-connecting-rod, and waste gas is discharged outside the cylinder.
As from the foregoing, the four-journey diesel engine in a work cycle, has only a stroke acting, and its excess-three stroke all is the auxiliary stroke that creates conditions for working stroke.In multicylinder engine, the working stroke of all cylinders does not carry out simultaneously, but an acting is uniformly arranged as much as possible at interval.6 Cylinder engines for example, in finishing a work cycle, two weeks of crankshaft rotating i.e. 720 degree, and every rotation 120 degree of crank angle just have a cylinder acting.In above referring to the example shown in Fig. 1 and Fig. 2, rail pressure period of waves is corresponding to the acting of a cylinder in 6 Cylinder engines.Thereby the multicylinder engine crankshaft operation is even, stable working, and can obtain enough big power.
Should be noted that the difference based on the motor self-characteristic, the pairing crank angle range in rail pressure meadow also is not quite similar.Usually, when bent axle near top dead center precontract 35-10 degree and before and after the oil nozzle oil spout, the rail pressure in the high pressure co-rail system is the highest and steady relatively, also promptly is in previously described rail pressure meadow this moment.The compression stroke of 4 stroke diesel engine occurs because the rail pressure meadow invariably accompanies, thereby can design a kind of mechanism of only rail pressure in the interval, rail pressure meadow being sampled.From the basic principle of diesel engine as can be known, when only crank angle is positioned at special angle in each work cycle in the rail pressure meadow (for example, bent axle is in budc 35-10 degree scope in the compression stroke) occur, thereby can adopt the triggering of crank angle as sampling rail pressure signal.
Hereinafter, will be referring to the method and apparatus of Fig. 3 to Fig. 8 detailed description according to mode of execution of the present utility model.Fig. 3 has schematically shown and has measured the flow chart 300 of the method for rail pressure according to a mode of execution of the utility model based on crank angle.In step S302, the actual rail pressure of measuring is in real time carried out filtering to form the input rail pressure.Should be noted that and to obtain real-time rail pressure signal in the high pressure co-rail system by the real-time pressure sensor, and adopt low-pass filter for example to filter noise in the real-time rail pressure signal, to form the rail pressure signal to be sampled of input.
In step S304, the input rail pressure is sampled to form sampled signal in predefined crankshaft angle interval.In one embodiment, can sample based on the interruption of crank angle.For example, rotate special angle (for example, 6 degree etc.) time at bent axle samples at every turn.Because bent axle comprises the gear teeth of specific quantity, can also sample when bent axle rotates the gear teeth of specific quantity at every turn.
For example, for 6 cylinder diesels, comprise 3 rail pressure periods of waves in one week of crankshaft rotating, trigger sampling when adopting with the crankshaft rotating special angle, then regardless of speed of crankshaft, the quantity of the sampled point that obtains in a period of waves is all identical.Particularly, comprise at bent axle under the situation of 60 gear teeth,, then can obtain 60 sampled points (corresponding to 3 rail pressure periods of waves) in one week of crankshaft rotating if when 1 gear teeth of the each rotation of bent axle, trigger once sampling; If when 2 gear teeth of the each rotation of bent axle, trigger once sampling, then can obtain 30 sampled points (corresponding to 3 rail pressure periods of waves) in one week of crankshaft rotating.
Should be noted that usually that 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 the 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 should be noted that in this specification and to adopt with bent axle that in other alternate embodiment, bent axle can also comprise the gear teeth of other quantity as example with 60 gear teeth.As long as fix as the angle of swing in sampling interval, it is constant then to obtain sampled point quantity in each period of waves.
In step S306, the sampled signal of rail pressure meadow of selecting to be arranged in high pressure co-rail system is as the feature sampled point of rail pressure.From above at the relation of rail pressure meadow and CAP as can be known, for general diesel engine, the rail pressure meadow in the high pressure co-rail system arrives zone in the budc 35-10 degree corresponding to crank angle.Then can be chosen in the numerical value that crank angle arrives the sampled point in the budc 35-10 degree inner region, as the feature sampled point of rail pressure.The feature sampled point of this moment can reflect in the high pressure co-rail system on the whole for the effective rail pressure value of control rail pressure.
By selecting the method for feature sampled point, can fast and effeciently reject rail pressure meadow " noise samples point (for example noise samples point that is arranged in the rail pressure wave zone 240 and 250 shown in Fig. 2) " in addition, thereby reach the purpose of accurate measurement rail pressure.
Then in step S308, the feature sampled point is carried out filtering to generate the measured value of rail pressure.The feature sampled point of step S306 gained can reflect the rail pressure value in the rail pressure meadow preferably, the processing in step S308 further the filtering noise sampled point so that obtain measured value more accurately.
In one embodiment, in predefined crankshaft angle interval the input rail pressure is sampled and comprise: corner signal is converted to periodically triggers the trigger signal that the input rail pressure is sampled to form sampled signal; Come the input rail pressure is sampled in response to each trigger point in the trigger signal.
Because crank angle corresponding to the gear teeth of specific quantity, can adopt multiple mode that corner signal is converted to the signal that the gear teeth rotate, and with crankshaft rotating through the gear teeth of specific quantity as the trigger signal that triggers sampling; Perhaps, in the time of can also directly passing through special angle, trigger rail pressure is sampled with crankshaft rotating.According to a mode of execution of the present utility model, trigger signal is a square signal.For example, can when gear teeth of the each rotation of bent axle (perhaps rotation is through the gear teeth of other quantity), trigger once sampling.Can also adopt square wave for example to describe the rotation of bent axle, for example,, form continuous square signal thus the starting point of gear teeth of the each rotation of bent axle trailing edge (perhaps rising edge) corresponding to square signal.
According to a mode of execution of the present utility model, 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 the trigger point, and rising edge that also can square signal is set to the trigger point, and only once sample this moment in a square-wave cycle.According to a mode of execution of the present utility model, the trailing edge and the rising edge of square signal all can also be set to the trigger point, then carry out double sampling this moment in a square-wave cycle.
For example, for bent axle,, can obtain 60 sampled points in one week of crankshaft rotating if square signal trailing edge (or rising edge) is set when the trigger point with 60 gear teeth; And when the trailing edge of square wave and rising edge all be set to the trigger point, can obtain 120 sampled points in one week of crankshaft rotating, sampling interval this moment is littler.
According to a mode of execution of the present utility model, 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 begins; Timer produces with predetermined time interval and interrupts to generate the trigger point, till the end cycle of trigger point that has produced predetermined quantity in the cycle at square signal or square signal.
According to a mode of execution, the individual trigger point of N (N is a positive integer) is set during can being chosen in a trigger signal period T, for example during a trigger signal cycle, Δ T once samples every the time, so that increase the quantity of sampled point.Should be noted that between the period T of the numerical value of N and Δ T and trigger signal and should satisfy following relation:
Δ T * (N-1)≤T formula 1
When Δ T * (N-1)＞T, can't satisfy and in a trigger signal period T, finish the sampling that the N minor tick is Δ T.Should be noted that in addition last sampled point of one-period overlaps with first sampled point of the following one-period that is close to just when Δ T * (N-1)=T.For the ease of calculating, interval delta T is set to be significantly smaller than the numerical value of trigger signal period T usually.
Referring now to Fig. 4, illustrates how during as the square-wave cycle of trigger signal, to select a plurality of trigger points.Fig. 4 has schematically shown according to flow chart 400 mode of execution of the utility model, choose the method for a plurality of trigger points during the one-period of trigger signal.In step S402, whether at first judge N (N is a positive integer) more than or equal to 1, if N equals 1, then in the one-period of the square wave of trigger signal, only select a trigger point.When N greater than 1 the time, then be illustrated in the one-period of square wave of trigger signal and select a plurality of trigger points.
In step S404,, Counter Value=N-1 is set in response to receiving the crank angle trailing edge.Then in step S406, the value of carrying out sampling and counter being set subtracts 1, and starting time-out time afterwards in step S408 is the timer of Δ T, samples so that trigger after through Δ T next time.In step S410, whether the value of judging this hour counter greater than 0, if greater than 0 then operation is returned step S406 to trigger sampling next time; Otherwise EO.By flow process shown in Figure 4, can be implemented in the method for during the trigger signal cycle, choosing a plurality of trigger points.
It should be noted that, satisfy formula 1 between the period T of method supposition N shown in Figure 4 and the numerical value of Δ T and trigger signal, when whether the relation of unknown N, Δ T and T satisfies formula 1, other stop condition can also be set, for example, when in the cycle of square signal, having produced the end cycle of a predetermined quantity N trigger point or square signal, shut-down operation.
Narrate according to the method for the utility model mode of execution advantage referring to Fig. 5 and Fig. 6 and comparison diagram 2 with respect to prior art.Fig. 5 has schematically shown the plotted curve 500 according to the rail pressure signal of sampling based on crank angle of a mode of execution of the utility model.Fig. 5 shows the rail pressure signal of 2 rail pressure periods of waves, 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 evenly distributes, although the rail pressure curve 530 that is formed by connecting by a plurality of sampled points also exists near be positioned at the crest rail pressure meadow and near the rail pressure wave zone the trough, yet this curve 530 wants much level and smooth with respect to the curve shown in the filtered rail pressure 230 among Fig. 2.
The sampled signal that sampled point 520 among Fig. 5 is also promptly obtained by step S304 among Fig. 3 in subsequent operation, also needs to select the feature sampled point in the rail pressure meadow, and the filtering of feature sampled point is drawn final measurement.With reference now to Fig. 6, describes 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 a mode of execution of the utility model.Fig. 6 shows 8 rail pressure periods of waves, wherein curve 610 shows the rail pressure curve of actual measurement, a plurality of points 620 with " * " expression are feature sampled points that selection draws, the filter value that a plurality of points 630 of representing with the black round dot are feature sampled points, and the filtered rail pressure curve of curve 640 expressions.
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 the rail pressure wave zone.Thereby result as shown in Figure 6 can represent the effective rail pressure in the high pressure co-rail system more exactly.By comparison diagram 2 as can be known, the result that same rail pressure fluctuation obtains at last through different processing methods has very big difference, of the present utility modelly measure rail pressure fluctuation that the method for rail pressure draws based on crank angle and be significantly less than rail pressure fluctuation, and no matter how rotating speed changes all can obtain comparatively desirable filtering result based on time sampling.This can provide for follow-up rail pressure PID control and import data more accurately.
Fig. 7 has schematically shown and has measured the block diagram 700 of the device of rail pressure according to a mode of execution of the utility model based on crank angle.As shown in Figure 7, this device comprises: the input rail pressure forms device 710, is used for the actual rail pressure of measuring is in real time carried out filtering to form the input rail pressure; Sampled signal forms device 720, is used in predefined crankshaft angle interval the input rail pressure being sampled to form sampled signal; Feature sampled point selector 730, the sampled signal of rail pressure meadow that is used to select to be positioned at high pressure co-rail system is as the feature sampled point of rail pressure; Rail pressure signal generator 740 is used for the feature sampled point is carried out filtering to generate the measured value of rail pressure.And input rail pressure formation device 710, sampled signal form device 720, feature sampled point selector 730 is connected successively with rail pressure signal generator 740.
According to a mode of execution of the present utility model, wherein sampled signal forms device 720 and can also comprise: trigger signal maker 722 is used for corner signal is converted to and periodically triggers the trigger signal that the input rail pressure is sampled; Sampler 724 is used for coming the input rail pressure is sampled in response to each trigger point of trigger signal; And trigger point maker 726, be used in the one-period of square signal, being provided with at least one trigger point.
According to a mode of execution of the present utility model, can also comprise rail pressure meadow selector 750, be used for selecting crank angle to arrive the rail pressure meadow of the interior zone of budc 35-10 degree, and this rail pressure meadow selector 750 is connected to feature sampled point selector 730 as high pressure co-rail system.
According to a mode of execution of the present utility model, wherein trigger signal is a square signal.
According to a mode of execution of the present utility model, wherein the trigger point is at least one in following: the rising edge of square signal, the trailing edge of square signal.
According to a mode of execution of the present utility model, the maker of trigger point shown in it comprises: starter is used for being provided with timer when the cycle of square signal begins; Interrupt maker, be used for timer and produce interruption to generate the trigger point, till the end cycle of trigger point that has produced predetermined quantity in the cycle at square signal or square signal with predetermined time interval.
Fig. 8 has schematically shown and has measured the specific implementation details 800 of the device of rail pressure according to a mode of execution of the utility model based on crank angle.As shown in Figure 8, real-time pressure sensor 802 is used for measuring in real time the actual rail pressure of high pressure co-rail system, first wave filter 804 is used for and will carries out filtering from the actual rail pressure of real-time pressure sensor 802 to form input rail pressure 806, modular converter 814 is converted to square signal 816 with original crankshaft signal 812, the input rail pressure 806 that A/D converter 808 receives from first wave filter 804, and square signal 816 conducts that receive from modular converter 814 trigger, will be based on the sampled data input buffer 810 of square wave 816 samplings, equalizer 820 will be converted to sampled signal from the data of buffer storage 810, selector 824 generates based on specific crank angle and interrupts, 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 826 pairs of feature sampled points from the rail pressure of selector 824 of second wave filter carry out filtering, to generate the measured value 828 of rail pressure.
According to a mode of execution of the present utility model, can also comprise: counter 818, be connected to modular converter 814, be used to receive square signal 816 from modular converter 814; In the one-period of described square signal 816, produce a plurality of samplings trigger point; The sampled signal input buffer 810 that to sample based on described a plurality of samplings trigger point.
Although show in detail a kind of specific implementation details of in high pressure co-rail system, measuring the device of rail pressure among Fig. 8 based on crank angle, it should be noted that, this illustrates only is an embodiment of the present utility model, can also adopt other unit, module, assembly, circuit to wait and realize other mode of executions of the present utility model.
How to utilize the rail pressure of measuring based on crank angle referring now to Fig. 9 to Figure 12 explanation, whether have fault in the diagnosis high pressure co-rail system.Fig. 9 has schematically shown the flow chart 900 according to the method for the fault in the high pressure co-rail system of the diagnosis motor of a mode of execution of the utility model.As shown in Figure 9, method starts from step S902, adopt to divide this moment cylinder technology with the cylinder that breaks of at least one cylinder in the described motor.The disconnected cylinder here is meant closes one or more cylinder and guarantees other cylinder proper functioning.For the sake of simplicity, can be once only to the disconnected cylinder of a cylinder; Yet it will be appreciated by those skilled in the art that also can be to a plurality of cylinders cylinder that breaks.When a plurality of cylinders were broken cylinder, the basic principle of tracing trouble was with identical to the disconnected cylinder of a cylinder, and just situation is complicated a little.
Included step S904 to S910 in block diagram 910 is based on the step that crank angle obtains the rail pressure in the described high pressure co-rail system behind the disconnected cylinder, and this step does not repeat them here with above similar referring to step shown in Fig. 3.According to a mode of execution of the present utility model, the method of in high pressure co-rail system, measuring the rail pressure in the high pressure co-rail system behind the disconnected cylinder shown in the block diagram 910 based on crank angle, can adopt above described any means to realize based on crank angle measurement rail pressure, and those skilled in the art can select and/or make up above-mentioned part and/or the whole feature that is used for measuring based on crank angle the method for rail pressure based on the different qualities and the state of high pressure co-rail system.
In step S912, ask for the rail pressure difference of rail pressure and the rail pressure of dispatching from the factory behind the described disconnected cylinder, when described difference is higher than predetermined threshold, judge that then there is fault in described high pressure co-rail system.Even should be appreciated that when motor just dispatches from the factory, because the difference of behaviour in service, the rail pressure value behind the disconnected cylinder also might there are differences with the Default Value value.This moment, difference may be very little and do not think that there is fault in motor, only when difference during above predetermined threshold, just thinks fault to have occurred.
According to a mode of execution of the present utility model, if there is fault in described high pressure co-rail system, then the compensation of fuel injection quantity that will be associated with described rail pressure difference and pump oil mass is to dispatch from the factory fuel injection quantity and pump oil mass, to calibrate described fault.Adopt the principle of this calibrating mode to be, when the power unit of motor occurs aging or during wearing and tearing, reason such as sealing reduction may occur and cause being reduced to normal value under the rail pressure in the common rail system.How many rail pressures reduced when adopting this moment disconnected cylinder technology can calculate the motor proper functioning, and the leakage rate that rail pressure value data when dispatching from the factory ask difference to be used as increasing in the ageing process by will break cylinder the time, this leakage rate is compensated to fuel injection quantity and pump oil mass, can reach the aging purpose of compensation.
Figure 10 has schematically shown according to the rail pressure waveform 1000 behind the disconnected cylinder of a mode of execution of the utility model.Owing to adopt in the specification 6 Cylinder engines as example, when break cylinder at a cylinder since wherein during a not oil spout of cylinder the rail pressure signal instantaneous rising can appear, then can decline gradually under pid algorithm is controlled.The zone that gray background shows among Figure 10 is the zone that instantaneous rising appears in the rail pressure signal behind the disconnected cylinder, 5 rail pressure cyclic swings between two gray background zones be 5 the cylinder of disconnected cylinders in the rail pressure fluctuation of normal work period.
Can adopt this moment based near the point the rail pressure method of measurement sampling rail pressure rising peak zone of crank angle, and to its average (shown in rail pressure average point 1010 behind the disconnected cylinder that stain among the figure is represented).
According to a mode of execution of the present utility model, the rail pressure signal that can get continuously behind the disconnected cylinder in a plurality of cycles is done same processing, then the point after handling in each cycle (be the disconnected cylinder among Fig. 1 after rail pressure average point 1010) is averaged, with its rail pressure value after as the cylinder that breaks.According to a mode of execution and since in a work cycle of motor a cylinder fuel injection once, then at sampling needle to specific cylinder during the rail pressure behind the disconnected cylinder, be spaced apart 720 degree between the crank angle.For example, can be in rail pressure value of the area sampling in crank angle arrives budc 35-10 degree, and when crank angle turns over 720 degree and arrives regional in the budc 35-10 degree once more, sample next time.
According to a mode of execution of the present utility model, the cylinder that can also one by one each cylinder in the motor be broken, the average of asking for rail pressure behind each disconnected cylinder is with as the rail pressure behind the cylinder that breaks.Figure 11 has schematically shown the realization block diagram 1100 according to the disconnected cylinder scheduler of a mode of execution of the utility model.Disconnected cylinder scheduler 1110 control oil spout final controlling element 1120 when to which cylinder cylinder that breaks.Disconnected cylinder scheduler 1110 can be successively one by one to the disconnected cylinder of each cylinder in the motor, for example with the disconnected cylinder M work cycle of first cylinder, recovers the first cylinder proper functioning and with second cylinder cylinder M work cycle of breaking, and the like.After through 6 * M work cycle, can draw rail pressure behind the higher disconnected cylinder of degree of accuracy.
Figure 12 has schematically shown the block diagram according to the device 1200 of the fault in the high pressure co-rail system of the diagnosis motor of a mode of execution of the utility model.This device comprises: disconnected cylinder controller 1210 is used for adopting the branch cylinder technology with at least one cylinder of described motor cylinder that breaks.Disconnected cylinder controller is used for to cylinder 1260 output control signals, with expression when with the disconnected cylinder of which cylinder.Should be noted that cylinder 1260 is not the device that is used for diagnosing the fault of high pressure co-rail system according to of the present utility model, but the intrinsic part of motor.
This device 1200 also comprises measuring appliance 1220, is used for measuring based on crank angle the rail pressure of described high pressure co-rail system behind the disconnected cylinder.Should be noted that measuring appliance 1220 can adopt above described any device based on crank angle measurement rail pressure to realize, for example adopts with reference to Fig. 7 and device shown in Figure 8.And those skilled in the art can select and/or make up above-mentioned part and/or the whole feature that is used for measuring based on crank angle the device of rail pressure based on the different qualities and the state of high pressure co-rail system.
This device 1200 also comprises determining device 1230, is used to ask for the rail pressure difference of rail pressure and the rail pressure of dispatching from the factory behind the described disconnected cylinder, and when described difference is higher than predetermined threshold, judges that there is fault in described high pressure co-rail system.In device 1200, disconnected cylinder controller 1210 control cylinders 1260, measuring appliance 1220 receives the rail pressure signal behind the disconnected cylinder, and measuring appliance 1220 is connected to determining device 1230.
According to a mode of execution of the present utility model, can also comprise disconnected cylinder scheduler 1240, be used for one by one each cylinder with described motor cylinder that break, the average of asking for rail pressure behind each disconnected cylinder is with as the rail pressure behind the cylinder that breaks.According to a mode of execution of the present utility model, can also comprise calibrator 1250, have fault if be used for described high pressure co-rail system, then the compensation of fuel injection quantity that will be associated with described rail pressure difference and pump oil mass is to dispatch from the factory fuel injection quantity and pump oil mass, to calibrate described fault.It interrupts cylinder scheduler 1240 and is connected to disconnected cylinder controller 1210, and determining device 1230 is connected to calibrator 1250.
Although show in detail the specific implementation details of the device of the fault in the high pressure co-rail system of diagnosing motor among Figure 12, it should be noted that, this illustrates only is an embodiment of the present utility model, can also adopt other unit, module, assembly, circuit to wait and realize other mode of executions of the present utility model.
It should be noted that, the meaning of term " connection ", " coupling " or its any variant is any connection or coupling direct or indirect between two or more elements, and can contain the situation that has one or more intermediary element between " connection " or " coupling " two elements together.Coupling between the element or connection can be physics, logic or its combination.As used herein, by using one or more leads, cable and/or printed circuit to connect, and by use electromagnetic energy (such as, have electromagnetic energy as the wavelength in radio frequency non-limiting but not exhaustive examples the zone, in the microwave region and light (the visible and invisible the two) zone), two elements can be considered as " connection " or " coupling " together.
The utility model can be taked hardware mode of execution, software mode of execution or not only comprise nextport hardware component NextPort but also comprised the form of the mode of execution of component software.In a preferred embodiment, the utility model is embodied as software, and it includes but not limited to firmware, resident software, microcode etc.
Benefit from the instruction that presents in aforementioned description and the associated drawings, the utility model mode of execution those skilled in the art can expect other mode of executions of the present utility model and a lot of the improvement.Therefore, should be appreciated that mode of execution of the present utility model is 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, under the prerequisite that does not break away from the 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 above explicit description and/or the various combination of function, and be documented in some of claims.Although used particular term, only aspect universal description, use these terms, rather than be used for restriction at this.
Claims (10)
1. the device of the fault in the high pressure co-rail system of diagnosing motor is characterized in that comprising:
-disconnected cylinder controller is used for adopting the branch cylinder technology with at least one cylinder of described motor cylinder that breaks;
-measuring appliance is used for measuring based on crank angle the rail pressure of described high pressure co-rail system behind the disconnected cylinder, comprising:
The input rail pressure forms device, is used for the actual rail pressure of measuring is in real time carried out filtering to form the input rail pressure;
Sampled signal forms device, is used in predefined crankshaft angle interval described input rail pressure being sampled to form sampled signal;
Feature sampled point selector, the described sampled signal of rail pressure meadow that is used to select to be positioned at described high pressure co-rail system is as the feature sampled point of described rail pressure;
The rail pressure signal generator is used for described feature sampled point is carried out filtering to generate the rail pressure behind the described disconnected cylinder;
-determining device is used to ask for the rail pressure difference of rail pressure and the rail pressure of dispatching from the factory behind the described disconnected cylinder, and when described difference is higher than predetermined threshold, judges that there is fault in described high pressure co-rail system.
2. device according to claim 1 is characterized in that also comprising:
Rail pressure meadow selector is used for selecting described crank angle to arrive the rail pressure meadow of the interior zone of budc 35-10 degree as described high pressure co-rail system.
3. device according to claim 1 is characterized in that described sampled signal forms device and comprises:
The trigger signal maker is used for corner signal is converted to and periodically triggers the trigger signal that described input rail pressure is sampled;
Sampler is used for coming described input rail pressure is sampled in response to each trigger point of described trigger signal.
4. device according to claim 2 is characterized in that described sampled signal forms device and comprises:
The trigger signal maker is used for corner signal is converted to and periodically triggers the trigger signal that described input rail pressure is sampled;
Sampler is used for coming described input rail pressure is sampled in response to each trigger point of described trigger signal.
5. device according to claim 4 is characterized in that described trigger signal is a square signal.
6. device according to claim 5 is characterized in that described sampled signal forms device and also comprises:
The trigger point maker is used for being provided with at least one trigger point in the one-period of described square signal.
7. device according to claim 6 is characterized in that described trigger point is at least one in following: the rising edge of described square signal, the trailing edge of described square signal.
8. device according to claim 6 is characterized in that described trigger point maker comprises:
Starter is used for being provided with timer when the described cycle of described square signal begins;
Interrupt maker, be used for described timer and produce interruption to generate the trigger point, till the described end cycle of trigger point that has produced predetermined quantity in the described cycle at described square signal or described square signal with predetermined time interval.
9. according to each described device in the claim 1 to 8, also comprise:
Disconnected cylinder scheduler is used for one by one each cylinder with described motor cylinder that break, and the average of asking for rail pressure behind each disconnected cylinder is with as the rail pressure behind the cylinder that breaks.
10. according to each described device in the claim 1 to 8, also comprise:
There is fault in calibrator if be used for described high pressure co-rail system, and then the compensation of fuel injection quantity that will be associated with described rail pressure difference and pump oil mass is to dispatch from the factory fuel injection quantity and pump oil mass, to calibrate described fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200353611U CN202091080U (en) | 2011-02-01 | 2011-02-01 | Device for diagnosing faults in the high-pressure co-rail system of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200353611U CN202091080U (en) | 2011-02-01 | 2011-02-01 | Device for diagnosing faults in the high-pressure co-rail system of engine |
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| Publication Number | Publication Date |
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| CN202091080U true CN202091080U (en) | 2011-12-28 |
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| CN2011200353611U Expired - Lifetime CN202091080U (en) | 2011-02-01 | 2011-02-01 | Device for diagnosing faults in the high-pressure co-rail system of engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182601A (en) * | 2011-02-01 | 2011-09-14 | 潍柴动力股份有限公司 | Method and device for diagnosing and calibrating faults in high-pressure common rail system |
| CN103047125A (en) * | 2012-12-11 | 2013-04-17 | 潍柴动力股份有限公司 | Oil pump feeding fault detecting method and device of high-pressure plunger-type fuel pump |
| CN113586302A (en) * | 2021-07-29 | 2021-11-02 | 北京工业大学 | Method for detecting valve tightness based on pressure drop characteristics |
-
2011
- 2011-02-01 CN CN2011200353611U patent/CN202091080U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182601A (en) * | 2011-02-01 | 2011-09-14 | 潍柴动力股份有限公司 | Method and device for diagnosing and calibrating faults in high-pressure common rail system |
| CN102182601B (en) * | 2011-02-01 | 2013-11-13 | 潍柴动力股份有限公司 | Method and device for diagnosing and calibrating faults in high-pressure common rail system |
| CN103047125A (en) * | 2012-12-11 | 2013-04-17 | 潍柴动力股份有限公司 | Oil pump feeding fault detecting method and device of high-pressure plunger-type fuel pump |
| CN103047125B (en) * | 2012-12-11 | 2015-07-08 | 潍柴动力股份有限公司 | Oil pump feeding fault detecting method and device of high-pressure plunger-type fuel pump |
| CN113586302A (en) * | 2021-07-29 | 2021-11-02 | 北京工业大学 | Method for detecting valve tightness based on pressure drop characteristics |
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