CN102536772A - Pump units - Google Patents
Pump units Download PDFInfo
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- CN102536772A CN102536772A CN2011104255222A CN201110425522A CN102536772A CN 102536772 A CN102536772 A CN 102536772A CN 2011104255222 A CN2011104255222 A CN 2011104255222A CN 201110425522 A CN201110425522 A CN 201110425522A CN 102536772 A CN102536772 A CN 102536772A
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- Prior art keywords
- pressure
- mentioned
- brushless motor
- controlling component
- detecting part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/05—Pressure after the pump outlet
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a pump unit, capable of properly detecting an abnormality occuring in a pressure detection device and continuously normally. Even in a state in which an abnormality occurs in the pressure detection device, an uncontrollable state is prevented and a normal control can be continued, wherein the pressure detection device detects a discharge pressure of the pump. In a pump unit including a sensor-less brushless motor, and a control device for controlling the brushless motor, the pressure detection device is provided on a discharge side of the pump and the control device controls the brushless motor so that a detected pressure becomes relatively equal to a target pressure. The control device is further able to determine a value of current supplied to the brushless motor and a rotational speed of the brushless motor. When an abnormality occurs in the pressure detection device, the control device determines an estimated pressure on the discharge side of the pump based on the determined current value and the determined rotational speed. It is then able to control the brushless motor so that the determined estimated pressure becomes equal to the target pressure.
Description
Technical field
The present invention relates to a kind of control and make that jet pressure is the pump unit of goal pressure, relate to the unusual judgement of the pressure detecting part that detects jet pressure and the control when unusual especially.
Background technique
In the fuel injection system of in recent years internal-combustion engine, have the fuel injection system of using ejecting system in the so-called tube, this interior ejecting system is to the machine barrel inner direct of the high pressure fuel of high pressure more.
In tube in the fuel supplying device of ejecting system; In series dispose low-pressure fuel pump and high pressure fuel pump; Through low-pressure fuel pump the fuel in the fuel tank temporarily is controlled to be the low voltage side goal pressure; Through being disposed at the fuel of low voltage side goal pressure is controlled to be the high pressure side goal pressure, sprays the fuel of this high pressure side goal pressure from sparger near the high pressure fuel pump of the position of sparger.
In existing fuel supplying device, high pressure fuel pump uses the high side pressure sensor to carry out feedback control to reach the high pressure side goal pressure, and low-pressure fuel pump uses the low-pressure lateral pressure sensor to carry out feedback control to reach the low voltage side goal pressure.
In the existing technology that patent documentation 1 is put down in writing a kind of fuel-injection device for internal combustion engine is disclosed for example; This fuel injection system through feed pump with the fuel pressurized delivered in the fuel tank to the area of low pressure; And through high-pressure service pump with the fuel pressurized delivered of area of low pressure to the territory, zone of high pressure, from the fuel in sparger inject high pressure zone.Be provided for detecting the pressure transducer of the special use of the pressure in the area of low pressure in the area of low pressure, be provided for detecting the high pressure sensor of the special use of the pressure in the high-pressure area in the high-pressure area.And according to controlling feed pump by the detected pressure of (area of low pressure is used) pressure transducer, basis is controlled high-pressure service pump by the detected pressure of (high-pressure area is used) high pressure sensor in the high-pressure area in the area of low pressure.
In addition; A kind of vehicle braked hydraulic control device is for example disclosed in the existing technology that patent documentation 2 is put down in writing; This brake liquid-pressure control device does not use the higher hydrostatic sensor of price of the supply pressure that is used to detect hydraulic power (gear pump); And be based on rotating speed according to the detected pressure of pressure transducer, pump motor, the hydraulic pressure that supplying electric current estimates comes control brake power, realizes that thus cost reduces, device is simplified.
In addition; For example the existing technology put down in writing of patent documentation 3 discloses a kind of fuel supply control device; It estimates fuel pressure according to revolution speed, will compare with estimating fuel pressure through the detected actual fuel pressure of pressure transducer, judges relief valve unusual of pump.
Patent documentation 1: Japan special table 2009-540205 communique
Patent documentation 2: TOHKEMY 2006-175905 communique
Patent documentation 3: TOHKEMY 2009-281184 communique
Summary of the invention
The problem that invention will solve
About patent documentation 1～patent documentation 3, take place under the unusual situation at pressure transducer, patent documentation 1～patent documentation 3 all can not detect the correct jet pressure (hydraulic pressure) of pump, thereby might can't normally control.But openly the processing when unusual does not take place in unusual determination methods, the pressure transducer of pressure transducer in patent documentation 1～patent documentation 3.
The present invention invents in view of this problem; Unusual pump unit has taken place in the pressure detecting part that purpose is to provide a kind of jet pressure that can suitably detect pump to detect, even and a kind of pressure detecting part the pump unit that also can not be absorbed in uncontrollable state unusually and can continue normal control has taken place.
The scheme that is used to deal with problems
In order to address the above problem, following means are taked in pump unit involved in the present invention.
At first; The pump unit of first invention of the present invention possesses the brushless motor of no sensor and the controlling component of the above-mentioned brushless motor of control; Ejection side in the said pump unit is provided with pressure detecting part, and above-mentioned controlling component is controlled above-mentioned brushless motor and made by the detected pressure of above-mentioned pressure detecting part to be that detected pressures is a goal pressure.
And; Controlling component can also detect the magnitude of current that offers above-mentioned brushless motor and the rotating speed of above-mentioned brushless motor; When above-mentioned pressure detecting part is unusual; Above-mentioned controlling component is obtained according to detected above-mentioned magnitude of current and detected above-mentioned rotating speed the pressure of ejection side is estimated the estimated pressure that obtains, and controls above-mentioned brushless motor and make that the estimated pressure of obtaining is above-mentioned goal pressure.
According to this first invention, take place under the unusual situation at pressure detecting part, use the estimated pressure of obtaining according to the rotating speed of magnitude of current that offers brushless motor and brushless motor to control, make that jet pressure is a goal pressure.
Compare with the detected pressures of utilizing pressure detecting part to obtain, the validity of estimated pressure descends slightly, even but take place unusual and can't use under the state of detected pressures at pressure detecting part, also can use estimated pressure to continue normal control.
Then; The pump unit of second invention of the present invention possesses the brushless motor of no sensor and the controlling component of the above-mentioned brushless motor of control; Ejection side in the said pump unit is provided with pressure detecting part, and above-mentioned controlling component is controlled above-mentioned brushless motor and made by the detected pressure of above-mentioned pressure detecting part to be that detected pressures is a goal pressure.
And; Controlling component can also detect the magnitude of current that offers above-mentioned brushless motor and the rotating speed of above-mentioned brushless motor; Above-mentioned controlling component is obtained according to detected above-mentioned magnitude of current and detected above-mentioned rotating speed the pressure of ejection side is estimated the estimated pressure that obtains, judges according to above-mentioned detected pressures and above-mentioned estimated pressure whether above-mentioned pressure detecting part is unusual.
In this second invention, for example,, can further improve the validity of unusual judgement according to the rotating speed that utilizes brushless motor and magnitude of current estimated pressure that estimates and the deviation of passing through the detected detected pressures of pressure detecting part.Can whether carry out the more unusual judgement of pinpoint accuracy to the testing signal of for example simple broken string unusual (open circuit), short circuit unusual (short circuit) and output near signal that should output level etc.
Then; The 3rd invention of the present invention is the related pump unit of above-mentioned second invention, and above-mentioned controlling component judges according to the deviation between the deviation between above-mentioned goal pressure and the above-mentioned detected pressures and above-mentioned detected pressures and the above-mentioned estimated pressure whether above-mentioned pressure detecting part is unusual.
According to the 3rd invention, judge the unusual of pressure detecting part according to the deviation of estimated pressure and detected pressures, also judge the unusual of pressure detecting part according to the deviation of goal pressure and detected pressures, can carry out the more judgement of pinpoint accuracy thus.
Description of drawings
Fig. 1 is the figure that a mode of execution of the fuel injection system of having used pump of the present invention unit 20 is described.
Fig. 2 is the figure of the example of structure of explanation pump unit 20.
Fig. 3 is the figure of the example of explanation the application and existing control block diagram.
Fig. 4 is electric current, rotating speed, the Pressure characteristics of the low-pressure fuel pump measured in advance.
Fig. 5 is the flow chart of example of the processing procedure of the feedback processing in example and this processing procedure of processing procedure of explanation low voltage side controlling component CL.
Fig. 6 is the figure of example of the processing procedure of the unusual judgment processing in the processing procedure of explanation low voltage side controlling component CL.
Fig. 7 is the figure of other example of the processing procedure of specification exception judgment processing.
Description of reference numerals
1: fuel supplying device; 10: fuel tank; 20: the pump unit; 21: arithmetic unit (CPU); 22: position detecting circuit; 30: the high pressure fuel pump unit; 40L, 40H: pressure detecting part; 50: the external control device; 61～64: sparger; CH: high pressure side controlling component; CL: low voltage side controlling component (controlling component); HH: pipe arrangement (high-pressure area); HL: pipe arrangement (area of low pressure); MH: high pressure fuel pump; ML: low-pressure fuel pump (brushless motor of no sensor); Tu1～Tw2: drive circuit.
Embodiment
Use accompanying drawing that mode of execution of the present invention is described below.Fig. 1 is the figure of a mode of execution of the fuel injection system of the explanation internal-combustion engine of having used pump of the present invention unit 20.In addition, pump of the present invention unit is the pump unit that possesses the brushless motor of no sensor, is equivalent to pump unit 20 shown in Figure 1 (low-pressure fuel pump unit).
[structure of fuel injection system (Fig. 1)]
Fuel injection system shown in Figure 1 has the fuel supplying device 1 that is made up of pump of the present invention unit 20 (low-pressure fuel pump unit) and high pressure fuel pump 30.
The fuel of store fluid in the fuel tank 10.
Import the low voltage side goal pressure from separating the external control device 50 (engine control computer etc.) that is provided with to low voltage side controlling component CL; This low voltage side controlling component CL controls low-pressure fuel pump ML so that the jet pressure of low-pressure fuel pump ML (pressure in the pipe arrangement HL) is the low voltage side goal pressure, the fuel in the fuel tank 10 is pressed and delivered in the pipe arrangement HL (be equivalent to the area of low pressure).
Low-pressure fuel pump ML is the brushless motor of no sensor, and details is described below.
In addition, in the pipe arrangement HL of the ejection side of low-pressure fuel pump ML, pressure detecting part 40L is set, low voltage side controlling component CL control low-pressure fuel pump ML makes by the detected detected pressures of pressure detecting part 40L to be the low voltage side goal pressure.
High pressure fuel pump unit 30 is made up of high pressure fuel pump MH and high pressure side controlling component CH.
Import the high pressure side goal pressure from separating the external control device 50 that is provided with to high pressure side controlling component CH; Controlling component CH control high pressure fuel pump MH in this high pressure side is pressed and delivered to the fuel that (is equivalent to the area of low pressure) in the pipe arrangement HL in the pipe arrangement HH (being equivalent to the high-pressure area) so that the jet pressure of high pressure fuel pump MH (pressure in the pipe arrangement HH) is the high pressure side goal pressure.
In addition, in the pipe arrangement HH of the ejection side of high pressure fuel pump MH, be provided with pressure detecting part 40H, high pressure side controlling component CH control high pressure fuel pump MH, making through the detected detected pressures of pressure detecting part 40H is the high pressure side goal pressure.
Sparger 61～64 sprays the fuel under high pressure in the feeder 60 that is connected with pipe arrangement HH according to the drive signal from external control device 50.
In addition, for example the fuel pressure in feeder 60 makes this fuel return pipe arrangement HL via valve 70 under the situation of imagination pressure.
In addition; External control device 50 is transfused to the testing signal from various input blocks (sensor etc.); Export the control signal of various output blocks (driver etc.), and drive signal, low voltage side goal pressure and the high pressure side goal pressure of output sparger 61～64.
[structure of pump unit 20 (Fig. 2)]
As shown in Figure 2, low-pressure fuel pump ML is the brushless motor of no sensor, for example has U phase, V phase, the W coil of this three-phase mutually.
The low voltage side controlling component CL that controls this brushless motor has arithmetic units 21 such as CPU, be used to detect the position detecting circuit 22 of the rotational position of brushless motor, to the drive circuit of U phase, V phase, W phase output driving current (Tu1～Tw2).
For example position detecting circuit 22 is testing circuits of counter electromotive force current, input pulse signal when each brushless motor arrives the regulation rotational position, and arithmetic unit 21 switches drive signal (pwm signal etc.) when each this pulse signal is imported.
In addition, to arithmetic unit 21 input low voltage side goal pressure, import testing signals to arithmetic unit 21 from external control device 50 from pressure detecting part 40L.
In addition; Arithmetic unit 21 can (signal of Tu1～Tw2) be (for example under the situation of pwm signal according to self outputing to drive circuit; The dutycycle of pwm signal (the conducting pulse width is with respect to the ratio [%] of pulse interval)), obtain the magnitude of current that offers brushless motor.
Like this; Need not newly to be provided with testing circuit etc.; Arithmetic unit 21 just can be used to the position detecting circuit 22 that spinning control just needs originally input state, (Tu1～output state Tw2) detects the rotating speed and the magnitude of current of brushless motor, thereby the brushless motor of no sensor is controlled to drive circuit.
[the application's control block diagram (Fig. 3 (A)) and existing control block diagram (Fig. 3 (B))]
The application's that Fig. 3 (A) expression is controlled low-pressure fuel pump ML control block diagram, the existing control block diagram of (B) expression of Fig. 3.
[existing control block diagram (Fig. 3 (B))]
Shown in the control block diagram of Fig. 3 (B); Obtained the deviation of goal pressure (in this case for low voltage side goal pressure) and detected pressures (jet pressure of the reality through the detected low-pressure fuel pump ML of pressure detecting part 40L) in the past through node N1A, the deviation of obtaining was input to computing module B1.
Computing module B1 is according to the deviation calculation controlled quentity controlled variable of input; (the optiumum control amount separately of Tu1～Tw2) is input to driver module B2 (drive circuit (Tu1～Tw2)) with the controlled quentity controlled variable that calculates to calculate drive circuit according to the rotation position detection signal from position detecting circuit 22.
Driver module B2 according to the input controlled quentity controlled variable to low-pressure fuel pump ML output drive signal.
Then, through the jet pressure that pressure detecting part 40L detects low-pressure fuel pump ML, give node N1A with pressure (detected pressures) reverse feedback of detected reality.
[the application's control block diagram (Fig. 3 (A))]
Shown in Fig. 3 (A); In the application's control block diagram; With respect in the past (Fig. 3 (B)), added the computing module B3 that calculates estimated pressure, given switching part SW that the pressure of node N1 selects and to the computing module B4 of switching part SW output switching signal reverse feedback.Through this structure, give node N1 with the some reverse feedbacks in (estimated pressure), (detected pressures).Below, mainly the difference with existing control block diagram (Fig. 3 (B)) is described.
The controlled quentity controlled variable that to obtain based on computing module B1 and the magnitude of current (offering the magnitude of current of low-pressure fuel pump ML) that obtains and based on from the testing signal of position detecting circuit 22 and the rotating speed (rotating speed of low-pressure fuel pump ML) that obtains is input to computing module B3.Then, computing module B3 calculates jet pressure (estimated pressure) according to magnitude of current and rotating speed.In addition, describe below about the computational methods of estimated pressure.
The estimated pressure that will calculate through computing module B3, be input to computing module B4, judge by this computing module B4 whether pressure detecting part 40L takes place unusually through detected detected pressures of pressure detecting part 40L and the goal pressure (low voltage side goal pressure) that is input to node N1.Computing module B4 does not take place under the unusual situation being judged as pressure detecting part 40L; Switching part SW is set in (detected pressures) side; Give node N1 with (detected pressures) reverse feedback; Taken place under the unusual situation being judged as pressure detecting part 40L, switching part SW has been set in (estimated pressure) side, given node N1 (estimated pressure) reverse feedback.
In addition, describe below about the processing (judging the abnormity processing of pressure detecting part 40L) of computing module B4.
[obtaining the method (Fig. 4) of pressure according to magnitude of current and rotating speed]
Use Fig. 4 that the method (processing of the computing module B3 among Fig. 3 (A)) according to magnitude of current and revolution speed calculating estimated pressure is described below.
Performance plot shown in Figure 4 is the performance plot of low-pressure fuel pump ML; The electric current [A] when using first dotted line to represent jet pressure and the relation of rotating speed [rpm] as A1 [KPa]; The electric current [A] when using second dotted line to represent jet pressure and the relation of rotating speed [rpm] as A2 [KPa]; The electric current [A] when using solid line to represent jet pressure and the relation of rotating speed [rpm] as A3 [KPa]; The electric current [A] when using dot and dash line to represent jet pressure and the relation of rotating speed [rpm] as A4 [KPa], the electric current [A] when using double dot dash line to represent jet pressure and the relation of rotating speed [rpm] as A5 [KPa].In addition, A1＜A2＜A3＜A4＜A5.
The side that electric current is big even rotating speed is identical (a high side loads) pressure (jet pressure) height, the side that rotating speed is little even electric current is identical (a high side loads) pressure (jet pressure) height.
More than; Knowing rotating speed but do not knowing under the situation of load (electric current) of brushless motor; Jet pressure is estimated to be difficulty very more accurately, knowing electric current (load) but do not know under the situation of rotating speed (flow) jet pressure is estimated it also is very difficult more accurately.In this application, can estimate the jet pressure more accurately of brushless motor according to rotating speed (flow) and electric current (load).
[processing procedure (Fig. 5 (B)) of the feedback processing in the example of the processing procedure of low voltage side controlling component CL (Fig. 5 (A)) and this processing procedure]
Use Fig. 5 that the example of the processing procedure of low voltage side controlling component CL (arithmetic unit 21) is described below.
Every moment at a distance from specific time interval or the regulation at every turn from the testing signal input of position detecting circuit 22 time etc. of low voltage side controlling component CL begins to carry out the processing shown in (A) of Fig. 5.
In step S10, low voltage side controlling component CL obtains goal pressure (being the low voltage side goal pressure in this case) from external control device 50, gets into step S11.
In step S11, low voltage side controlling component CL obtains the testing signal of pressure detecting part 40L, obtains detected pressures (testing signal is converted into detected pressures) according to testing signal, gets into step S12.
In step S12, low voltage side controlling component CL basis is obtained the current rotating speed of low-pressure fuel pump ML from the interval (cycle) of the pulse signal of position detecting circuit 22.In addition, (drive signal of Tu1～Tw2) is obtained magnitude of current according to self outputing to drive circuit.And according to the testing signal from the voltage detecting parts that fuel supplying device 1 employed supply voltage is detected, obtaining power source voltage is measuring voltage, according to predefined reference potential and measuring voltage magnitude of current is proofreaied and correct.For example, be to be that reference potential is 12 [V] under the situation of the characteristic measured of benchmark with 12V in low-pressure fuel pump characteristics shown in Figure 4.So, be under the situation of 10 [V] for example in measuring voltage, according to following mode magnitude of current is proofreaied and correct.
Magnitude of current (proofreading and correct the back)=magnitude of current (before proofreading and correct) * (12 [V]/10 [V])
Then, obtain estimated pressure, get into step S20 according to magnitude of current after the rotating speed of obtaining, the correction and low-pressure fuel pump characteristics shown in Figure 4.
The processing of above-mentioned steps S12 is equivalent to the processing of Fig. 3's the computing module B3 shown in (A).
In addition, also can omit the correction that utilizes measuring voltage that magnitude of current is carried out.
In step S20, low voltage side controlling component CL judges whether pressure detecting part 40L takes place unusually, gets into step S30.
In step S30, low voltage side controlling component CL carries out feedback control to low-pressure fuel pump ML, and the jet pressure that makes low-pressure fuel pump ML is the low voltage side goal pressure, end process.
Use Fig. 5 (B) describes the feedback processing of the step S30 in the flow chart of Fig. 5 (A) below.In addition, the processing of step S30 is equivalent to the processing that switching part SW, node N1, computing module B1 and driver module B2 among Fig. 3 (A) are carried out.
In step S31, whether normally low voltage side controlling component CL judges pressure detecting part 40L (S20 judges through step).When being judged as normal (being), get into step S32, when being judged as unusual (denying), get into step S33.
Under the situation that has got into step S32; Low voltage side controlling component CL obtains the deviation of goal pressure of obtaining through step S10 (low voltage side goal pressure) and the detected pressures of obtaining through step S11; According to the controlled quentity controlled variable of this deviation calculation low-pressure fuel pump ML, get into step S34.
Under the situation that has got into step S33; Low voltage side controlling component CL obtains the deviation of goal pressure of obtaining through step S10 (low voltage side goal pressure) and the estimated pressure that calculates through step S12; According to the controlled quentity controlled variable of this deviation calculation low-pressure fuel pump ML, get into step S34.
In step S34, low voltage side controlling component CL is according to the controlled quentity controlled variable of obtaining with through the detected rotation position detection signal of step S12, to drive circuit (Tu1～Tw2) drive to drive low-pressure fuel pump ML, end process.
[judging the abnormity processing process (Fig. 6) of pressure detecting part 40L]
Use Fig. 6 that the unusual judgment processing of the step S20 in the flow chart of Fig. 5 (A) is described below.In addition, the processing of step S20 is equivalent to the processing that the computing module B4 among (A) of Fig. 3 is carried out.
In step S21, low voltage side controlling component CL obtains the testing signal of pressure detecting part 40L, judges whether testing signal (detection voltage) surpasses upper limit threshold.In the example of this mode of execution, detect voltage with aanalogvoltage input with corresponding 0 [V]～5 [V] of pressure, the voltage 4.5 [V] that generally can not occur is set at the upper limit threshold that detects voltage.When surpassing upper limit threshold (being), get into step S21T, when not surpassing upper limit threshold (denying), get into step S22.
Under the situation that has got into step S21T, low voltage side controlling component CL at the state continuance that surpasses upper limit threshold get into step S21X, end process when the state that surpasses upper limit threshold continues first stipulated time (denying) during first stipulated time (being).
Under the situation that has got into step S21X, it is unusual that low voltage side controlling component CL is judged as pressure detecting part 40L, end process (it is unusual to be judged as broken string in this case).
Under the situation that has got into step S22, low voltage side controlling component CL judges whether the testing signal (detection voltage) of pressure detecting part 40L is lower than lower threshold.In the example of this mode of execution, detect voltage with aanalogvoltage input with corresponding 0 [V]～5 [V] of pressure, the voltage 0.5 [V] that generally can not occur is set at the lower threshold that detects voltage.When being lower than lower threshold (being), get into step S22T, when being not less than lower threshold (denying), get into step S23.
Under the situation that has got into step S22T, low voltage side controlling component CL at the state continuance that is lower than lower threshold get into step S22X, end process when the state that is lower than lower threshold continues second stipulated time (denying) during second stipulated time (being).
Under the situation that has got into step S22X, it is unusual that low voltage side controlling component CL is judged as pressure detecting part 40L, end process (it is unusual to be judged as short circuit in this case).
Under the situation that has got into step S23, low voltage side controlling component CL judges that whether the deviation of goal pressure (being the low voltage side goal pressure in this case) and detected pressures (through the detected pressure of pressure detecting part 40L) is more than or equal to first pressure difference (for example 50 [KPa]).More than or equal to first pressure difference (being) time, get into step S23A, less than first pressure difference (denying) time, get into step S25T.
Under the situation that has got into step S23A, low voltage side controlling component CL judges that whether the deviation of detected pressures and estimated pressure (pressure that estimates according to rotating speed and magnitude of current) is more than or equal to second pressure difference (for example 30 [KPa]).More than or equal to second pressure difference (being) time, get into step S23T, less than second pressure difference (denying) time, get into step S24.
When having got into step S23T (being), judge whether this state (among the step S23 more than or equal among first pressure difference and the step S23A more than or equal to second pressure difference) continued for the 3rd stipulated time.Get into step S23X, end process when continuing the 3rd stipulated time (denying) when (being) continuing for the 3rd stipulated time.
Under the situation that has got into step S23X, low voltage side controlling component CL judges that pressure detecting part 40L is unusual, end process.In this case, though the level of testing signal in the scope of upper limit threshold and lower threshold, is judged as unusual (indefinite unusual or characteristic is unusual) of the not output testing signal corresponding with pressure.
Under the situation that has got into step S24, low voltage side controlling component CL judges whether to supply with maximum current.Whether the dutycycle of for example, judging pwm signal is 100 [%] (maximum duty cycle).When supplying with maximum current (being), get into step S24T, when not supplying with maximum current (denying), get into step S25T.
Judge when having got into step S24T (being) whether this state (supplying with maximum current) continued for the 4th stipulated time.Get into step S24X, end process when continuing the 4th stipulated time (denying) when (being) continuing for the 4th stipulated time.
Under the situation that has got into step S24X, system's (pipe arrangement etc.) that low voltage side controlling component CL is judged as fuel supplying device 1 is unusual, end process (be judged as in this case be not that pressure detecting part 40L is unusual, but system exceptions such as pipe arrangement leakage).
Under the situation that has got into step S25T, low voltage side controlling component CL judges whether the state (being no abnormal state) of the judgement of carrying out this step S25 continued for the 5th stipulated time.Get into step S25X, end process when continuing the 5th stipulated time (denying) when (being) continuing for the 5th stipulated time.
Under the situation that has got into step S25X, low voltage side controlling component CL is judged as pressure detecting part 40L normal (no abnormal), end process.
[judging other example (Fig. 7) of the abnormity processing process of pressure detecting part 40L]
Use Fig. 7 that other example of the unusual judgment processing process shown in the flow chart of Fig. 6 is described below.
With respect to flow chart shown in Figure 6, flow chart shown in Figure 7 is different in the following areas: added the processing (initial step) of step S20A; Step S23, S23A, S24, S24T, S24X have been omitted.Below, mainly the difference with flow chart shown in Figure 6 is described.
In step S20A, low voltage side controlling component CL judges that whether the deviation of goal pressure (being the low voltage side goal pressure in this case) and estimated pressure is more than or equal to first pressure difference (for example 50 [KPa]).More than or equal to first pressure difference (being) time, get into step S21, less than first pressure difference (denying) time, get into step S25T.
Under the situation that has got into step S21, low voltage side controlling component CL judges whether testing signal (detection voltage) surpasses upper limit threshold.When surpassing upper limit threshold (being), get into step S21T, when not surpassing upper limit threshold (denying), get into step S22.
Under the situation that has got into step S22, low voltage side controlling component CL judges whether testing signal (detection voltage) is lower than lower threshold.When being lower than lower threshold (being), get into step S22T, when being not less than lower threshold (denying), get into step S23T.
The processing of other step is identical with processing illustrated in fig. 6, therefore omits explanation.
More than, in the processing of flow chart shown in Figure 7, simplified the processing of flow chart shown in Figure 6, omitted the judgement (step S24X) of system exception.
More than, the pump unit of explaining in this mode of execution 20 need not to be provided with new pressure detecting part, just judges more pinpoint accuracy whether pressure detecting part 40L takes place unusually, thereby can realize system simplification and cost degradation.
In addition, be judged as under the unusual situation of pressure detecting part 40L generation, using estimated pressure control low-pressure fuel pump ML, therefore can not be absorbed in Control Failure, can more safely proceed control.
The outward appearance that pump of the present invention unit 20 is not limited to explain in this mode of execution, structure, circuit, processing etc. can be carried out various changes, interpolation, deletion in the scope that does not change purport of the present invention.For example, the characteristic of low-pressure fuel pump ML is not limited to performance plot shown in Figure 4, and low voltage side controlling component CL, low-pressure fuel pump ML are not limited to example of structure shown in Figure 2.
In addition, the pump unit of explaining in this mode of execution 20 is not limited to the petrolift of internal-combustion engine, can be applied to use the various pumps unit of the brushless motor of no sensor.
Claims (3)
1. pump unit, the controlling component that it possesses the brushless motor of no sensor and controls above-mentioned brushless motor, wherein,
Ejection side in the said pump unit is provided with pressure detecting part,
Above-mentioned controlling component is controlled above-mentioned brushless motor, makes by the detected pressure of above-mentioned pressure detecting part to be that detected pressures is a goal pressure,
Above-mentioned controlling component can also detect the magnitude of current that offers above-mentioned brushless motor and the rotating speed of above-mentioned brushless motor,
When above-mentioned pressure detecting part was unusual, above-mentioned controlling component was obtained according to detected above-mentioned magnitude of current and detected above-mentioned rotating speed the pressure of ejection side is estimated the estimated pressure that obtains,
Above-mentioned controlling component is controlled above-mentioned brushless motor, makes that the estimated pressure of obtaining is above-mentioned goal pressure.
2. pump unit, the controlling component that it possesses the brushless motor of no sensor and controls above-mentioned brushless motor, wherein,
Ejection side in the said pump unit is provided with pressure detecting part,
Above-mentioned controlling component is controlled above-mentioned brushless motor, makes by the detected pressure of above-mentioned pressure detecting part to be that detected pressures is a goal pressure;
Above-mentioned controlling component can also detect the magnitude of current that offers above-mentioned brushless motor and the rotating speed of above-mentioned brushless motor,
Above-mentioned controlling component is obtained according to detected above-mentioned magnitude of current and detected above-mentioned rotating speed the pressure of ejection side is estimated the estimated pressure that obtains,
Above-mentioned controlling component judges according to above-mentioned detected pressures and above-mentioned estimated pressure whether above-mentioned pressure detecting part is unusual.
3. pump according to claim 2 unit is characterized in that,
Above-mentioned controlling component judges according to the deviation between the deviation between above-mentioned goal pressure and the above-mentioned detected pressures and above-mentioned detected pressures and the above-mentioned estimated pressure whether above-mentioned pressure detecting part is unusual.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010281462A JP5461380B2 (en) | 2010-12-17 | 2010-12-17 | Pumping unit |
| JP2010-281462 | 2010-12-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102536772A true CN102536772A (en) | 2012-07-04 |
| CN102536772B CN102536772B (en) | 2015-03-18 |
Family
ID=46234683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110425522.2A Expired - Fee Related CN102536772B (en) | 2010-12-17 | 2011-12-15 | Pump units |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20120156056A1 (en) |
| JP (1) | JP5461380B2 (en) |
| CN (1) | CN102536772B (en) |
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| CN105339621A (en) * | 2013-07-10 | 2016-02-17 | 日野自动车株式会社 | Device for detecting that fuel shut-off valve is stuck closed |
| CN107002605A (en) * | 2014-12-23 | 2017-08-01 | 大陆汽车有限公司 | Transmission equipment for transporting medium and for limiting system pressure |
| CN109386416A (en) * | 2017-08-02 | 2019-02-26 | 大陆汽车电子(芜湖)有限公司 | Dry operating diagnostic system and method for fuel pump |
| TWI679064B (en) * | 2014-10-23 | 2019-12-11 | 日商東京威力科創股份有限公司 | Liquid delivery method, liquid delivery system, and computer-readable storage medium |
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| JP5931844B2 (en) * | 2013-12-27 | 2016-06-08 | 三菱重工業株式会社 | Diagnosis system and diagnosis method for hydraulic machine, hydraulic transmission and wind power generator |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2012127316A (en) | 2012-07-05 |
| CN102536772B (en) | 2015-03-18 |
| US20120156056A1 (en) | 2012-06-21 |
| JP5461380B2 (en) | 2014-04-02 |
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