CN100557391C - Liquid condition sensing apparatus - Google Patents
Liquid condition sensing apparatus Download PDFInfo
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- CN100557391C CN100557391C CNB2006101062049A CN200610106204A CN100557391C CN 100557391 C CN100557391 C CN 100557391C CN B2006101062049 A CNB2006101062049 A CN B2006101062049A CN 200610106204 A CN200610106204 A CN 200610106204A CN 100557391 C CN100557391 C CN 100557391C
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Abstract
The condenser type liquid condition sensing apparatus comprises a pair of electrode 1-1 and the 1-2 that forms first electric capacity that be arranged; A pair of electrode 2-1 and the 2-2 that forms second electric capacity that be arranged; By the circuit board that sensing circuit forms, this circuit board comes the liquid condition of sensing such as liquid level according to the one the second electric capacity; With 1-1,1-2,2-1 and 2-2 conductive path, these conductive paths are connected to sensing circuit with 1-1,1-2,2-1 and 2-2 electrode respectively, and comprise 1-1 respectively, 1-2,2-1 and 2-2 current-carrying part.1-1,1-2,2-1 and 2-2 current-carrying part are arranged in a row and are extend side by side.1-1,1-2,2-1 and 2-2 current-carrying part make first stray capacitance that is formed between 1-1 current-carrying part and the 1-2 current-carrying part equate with second stray capacitance that is formed between 2-1 current-carrying part and the 2-2 current-carrying part through layout.
Description
Technical field
The present invention relates to liquid condition sensing apparatus, this device is used for the liquid condition of sensing such as liquid level, relates more specifically to the condenser type liquid condition sensing apparatus.
Background technology
The Japanese patent application 63-79016 that has announced discloses the gasoline that is used for the sensing motor vehicles or the capacitance level transducer of oil liquid level.This sensor is arranged and immerses fluid to be measured at least in part with its liquid level of sensing.It is right that this liquid level sensor comprises the reference electrode that for good and all immerses under the liquid, and the potential electrode that partly immerse liquid is right, and the sensing circuit of the ratio measuring liquid level by electric capacity between reference electrode and the electric capacity between potential electrode.
By also use reference electrode except that potential electrode, although there is the variation of liquid dielectric, this liquid level sensor is measuring liquid level exactly also.
Summary of the invention
Yet because the perhaps existence of stray capacitance of stray electrical, the accuracy of measurement is lowered, and this stray capacitance is formed between two current paths from the reference electrode to the sensing circuit or is formed between two current paths from the potential electrode to the sensing circuit.When the stray capacitance between two paths of stray capacitance between the conductive path of reference electrode and potential electrode does not wait, the difference of these two stray capacitances will have a negative impact to the level gauging accuracy.
Therefore the object of the present invention is to provide the condenser type liquid condition sensing apparatus of measuring liquid level more accurately.
According to the present invention, the condenser type liquid condition sensing apparatus that is used for the sensing liquid condition that partly immerses liquid to the major general comprises: the first electrode pair 1-1 electrode and 1-2 electrode, this electrode pair are arranged and form first electric capacity that changes with liquid condition; The second electrode pair 2-1 electrode and 2-2 electrode, this electrode pair are arranged and form second electric capacity that changes with liquid condition; By the circuit board that sensing circuit forms, this sensing circuit is used to monitor first and second electric capacity and according to the first and second capacitance sensing liquid conditions; The 1-1 conductive path that comprises the 1-1 current-carrying part that the 1-1 electrode is linked to each other with sensing circuit; The 1-2 conductive path that comprises the 1-2 current-carrying part that the 1-2 electrode is linked to each other with sensing circuit; The 2-1 conductive path that comprises the 2-1 current-carrying part that the 2-1 electrode is linked to each other with sensing circuit; With the 2-2 conductive path that comprises the 2-2 current-carrying part that the 2-2 electrode is linked to each other with sensing circuit.
According to an aspect of the present invention, the 1-1 current-carrying part, the 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part are arranged to a row, and launch side by side; And 1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 be disposed such so that be formed at first stray capacitance between 1-1 current-carrying part and 1-2 current-carrying part and be formed at the 2-1 current-carrying part and the 2-2 current-carrying part between second stray capacitance equate.
According to another aspect of the present invention, the 1-1 current-carrying part, the 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part are arranged in a row, and launch side by side; And the 2-1 current-carrying part extends between 1-1 current-carrying part and 1-2 current-carrying part, and the 1-2 current-carrying part extends between 2-1 current-carrying part and 2-2 current-carrying part part.
According to a further aspect of the invention, the 1-1 conductive path further comprises the 1-1 terminals that link to each other with the 1-1 electrode; The 1-2 conductive path further comprises the 1-2 terminals that link to each other with the 1-2 electrode; The 2-1 conductive path further comprises-1 terminals that link to each other with the 2-1 electrode; The 2-2 conductive path further comprises the 2-2 terminals that link to each other with the 2-2 electrode; Liquid condition sensing apparatus further comprises the flexible electrical pole plate, and this flexible electrical pole plate comprises: vertical area forms electrode 1-1,1-2,2-1 and 2-2 in this zone; Horizontal zone forms electrode 1-1,1-2,2-1 and 2-2 terminals in this zone; And bending area, this zone is crooked between vertical area and horizontal zone; And circuit board, this circuit board is relative with the horizontal zone of flexible electrical pole plate.
Sensing circuit can comprise: first grounded part that makes 1-1 conductive path and 1-2 conductive path ground connection; Make second grounded part of 2-1 conductive path and 2-2 conductive path ground connection; With the capacitance measurement part, this part is measured first electric capacity under the first measurement state, at least in 1-1 conductive path and the 1-2 conductive path is not grounded under the first measurement state, and 2-1 conductive path and 2-2 conductive path are all by the second grounded part ground connection, and this part is measured second electric capacity under the second measurement state, at least in 2-1 conductive path and the 2-2 conductive path is not grounded under the second measurement state, and 1-1 conductive path and 1-2 conductive path are all by the first grounded part ground connection.
Description of drawings
Fig. 1 is the front view of liquid level sensor according to an embodiment of the invention.
Fig. 2 is the figure that the guide pillar layout of liquid level sensor among Fig. 1 is shown.
Fig. 3 is a liquid level sensor planimetric map among Fig. 1.
Fig. 4 is the sectional view that strides across the liquid level sensor of F4-F4 line shown in Figure 1.
Fig. 5 is the sectional view of the liquid level sensor that strides across F5-F5 line shown in Figure 3 under the confined state, and liquid level sensor is installed on the fuel tank under this state.
Fig. 6 A is the planimetric map that the thin-film electro pole plate of liquid level sensor shown in Figure 1 is shown; And Fig. 6 B is the sectional view that strides across the liquid level sensor of the F6B-F6B line shown in Fig. 6 A, the figure shows the program of making the thin-film electro pole plate.
Fig. 7 is the skeleton view that the frame member that supports the thin-film electro pole plate shown in Fig. 6 A and the 6B is shown.
Fig. 8 is the figure that the circuit structure of liquid level sensor among Fig. 1 is shown.
Fig. 9 is the process flow diagram of oil liquid level sensing control program, and this control program is realized by the sensing circuit of the fuel level sensor of Fig. 1.
Figure 10 is the process flow diagram of the reference measure program of carrying out under the S120 of Fig. 9 step.
Figure 11 is the process flow diagram of the sensor measurement program of carrying out under the S130 of Fig. 9 step.
Figure 12 is the process flow diagram of the liquid level calculation procedure that carries out under the S140 of Fig. 9 step.
Figure 13 is the process flow diagram of the PWM written-out program that carries out under the S420 of Figure 12 step.
Figure 14 is the process flow diagram of the timer interrupt program that carries out of the sensing circuit by liquid level sensor among Fig. 1.
Embodiment
Fig. 1-5 shows liquid level sensor (as the condenser type liquid condition sensing apparatus) 100, and Fig. 8 shows the circuit structure of this liquid level sensor.Liquid level sensor 100 is arranged and immerses liquid at least in part with sensed level.In this example, liquid level sensor 100 is installed in internal combustion engine of motor vehicle fuel tank bottom LT, make liquid level sensor 100 axis AX vertically V extend up to supine before (top) end 100s, and liquid level sensor 100 is arranged the liquid level of the interior oily OL of sensing fuel tank.
As shown in figs. 1 and 3, liquid level sensor 100 comprises the substructure member 121 of resin; Tubular sensors lid 111 with and wrap film battery lead plate (substrate) 131 (Fig. 6 A shown in) protruding upward from substructure member 121, thin-film electro pole plate 131 has electrode 132,133,138,139 etc. and as shown in Figure 5 at the frame member 141 (shown in Fig. 7) of vertical direction V upper support thin-film electro pole plate 131.Substructure member 121 carriage members 141 and sender unit cap 111.As shown in Figure 5, substructure member 121 is installed in fuel tank bottom LT in the fuel tank, makes frame member 141 and sender unit cap 111 be set in the fuel tank.
Thin-film electro pole plate 131 in this example is flexible.As shown in Figure 6A, the longitudinal direction of thin-film electro pole plate 131 from cardinal extremity (lower end) 131k along thin-film electro pole plate 131 (making progress as shown in Figure 6A) extends lengthwise into front end (upper end) 131s.Thin-film electro pole plate 131 in this example comprises wide rectangle part (bottom) 131h that extends to front end from cardinal extremity 131; In the past (on) hold 131s to extend to narrow rectangle part (top) 131n of base (descending) end 131k; Leniently the upper end of rectangle part 131h extends to tapering part (center section) 131p of the lower end of narrow rectangle part 131n, and the width of this taper leniently upper end of rectangle part 131h reduces gradually to narrow rectangle part 131n lower end.
Thin-film electro pole plate 131 in this example is one and comprises polyimide resin film 131b; Form the first and second capacitor C P1 and CP2 (CP1b, electrode 132,133,138 CP2c) and 139 conductive layer 131d; Lamination with polyimide resin film 131c.Conductive layer 131d is inserted into and is clipped between resin molding 131b and the 131c.Resin molding 131b and 131c have the position that keeps conductive layer 131d and protect conductive layer 131d not to be subjected to the infringement of oily OL or air with conduction (or leakage) that prevents to produce by oily OL and the function that prevents the erosion that oily OL or air cause.In this example, as shown in Figure 6A, conductive layer 131d is formed at resin molding or resin bed 131b goes up and is patterned.
The 2-1 electrode 132 that reference electrode is right be shaped as long rectangle or band shape, and longitudinal extension advances the tapering part 131p of narrow rectangle part 131n and thin-film electro pole plate.2-1 electrode 132 is electrically connected to 2-1 electrode terminal 152t by 2-1 electrode connecting line 152f, and 152t is connected to the 2-1 guide pillar 152r that mentions later, and the shape picture square of 152r.Similar with 2-1 electrode 132,2-2 electrode 133 is formed on the tapering part of narrow rectangle part 131n and thin-film electro pole plate 131.2-2 electrode 133 comprises 2-21 electrode 133b and 2-22 electrode 133c, and these two electrodes are electrically connected by electrode connecting line 135d.2-21 electrode 133b is shaped as long rectangle or band shape, and is electrically connected to 2-2 electrode terminal 153t by electrode connecting line 2-2, and 153t is connected with the 2-2 guide pillar 153r that mentions later, and the shape picture square of 153r.
2-1 electrode connecting line 152f and 2-1 electrode terminal 152t are parts that extends to the 2-1 conductive path (or passage) 152 of sensing circuit 161 from 2-1 electrode 132.2-2 electrode connecting line 153f and 2-2 electrode terminal 153t are parts that extends to the 2-2 conductive path (or passage) 153 of sensing circuit 161 from 2-2 electrode 133.Sensing circuit 161 is formed on the circuit board of mentioning later 124.
2-1 electrode 132 is formed between 2-21 electrode 133b and the 2-22 electrode 133c along the horizontal HK of thin-film electro pole plate 131.First gap 135 of determining width in advance is formed between 2-21 electrode 133b and the 2-1 electrode 132, and extend along vertical (AX) of membrane electrode substructure member 131 in this gap.Therefore, 2-1 electrode 132 and 2-21 electrode 133b form the capacitor CP2b across gap 135.Similarly, second gap 136 of determining width in advance is formed between 2-22 electrode 133c and the 2-1 electrode 132, extend along vertical (AX) of membrane electrode substructure member 131 in this gap, and 2-1 electrode 132 and 2-22 electrode 133b form the capacitor CP2c across gap 136.Therefore, 2-1 electrode 132 and 2-2 electrode 133 have formed associating capacitor CP2 by combined capacitor CP2b and CP2c between two electrodes.
The right 1-1 electrode 138 of reference electrode is connected electrically to the foursquare 1-1 electrode terminal 158t of picture by 1-1 electrode connecting line 158f.The right 1-2 electrode 139 of reference electrode is connected electrically to the foursquare 1-2 electrode terminal 159t of picture by 1-2 electrode connecting line 159f.
1-1 electrode connecting line 158f and 1-1 electrode terminal 158t are parts that extends to the 1-1 conductive path 158 of sensing circuit 161 from 1-1 electrode 138.1-2 electrode connecting line 159f and 1-2 electrode terminal 159t are parts that extends to the 1-2 conductive path 159 of sensing circuit 161 from 1-2 electrode 139.
Each reference electrode (1-1 electrode 138 and 1-2 electrode 139) shape is as pectination, and two reference electrodes intersect and quilt gap 140 isolation of definite width in advance mutually.Reference electrode to 138 and 139 along thin-film electro pole plate 131 vertically potential electrode to 132 and 133 and the cardinal extremity 131k of thin-film electro pole plate between.The capacitor CP1 that 1-1 reference electrode 138 and 1-2 reference electrode 139 form across gap 140.Potential electrode is extended between the front end 131s of battery lead plate 131 and reference electrode are to 138 and 139 132 and 133.
Last through hole 131f is formed on the thin-film electro pole plate 131, near preceding (or on) the end 131s that is in the middle of the horizontal HK.On this through hole 131f battery lead plate 131 vertically on shape as oblong.Last through hole 131f is used to location thin-film electro pole plate 131 in the operation that thin-film electro pole plate 131 is installed on the frame member 141, and is used to keep the top of thin-film electro pole plate 131 to give prominence to stop the top near front end 131s.In addition, two manhole 131e that are used for being provided with thin-film electro pole plate 131 have been formed at the tapering part 131p of thin-film electro pole plate 131.
Shown in Fig. 6 A and 6B, electrode 132,133,137,138 and 139, electrode connecting line 152f, 153f, 158f and 159f and electrode terminal 152t, 153t, 158t and 159t form by the single conductive layer on the same substrate of same thin-film electro pole plate 131 (for example layer 131b or 131c).
The horizontal HK in 2-1 electrode terminal 152t edge is between 1-1 electrode terminal 158t and 1-2 electrode terminal 159t.1-2 electrode terminal 159t is between the 2-1 electrode terminal 152t and 2-2 electrode terminal 153t of the horizontal HK in edge.As shown in Figure 6A, 5 square- shaped electrode terminals 153t, 159t, 157t, 152t are become a row according to mentioned order by lateral arrangement in the place near cardinal extremity 131k with 158t.
In order to reach the layout of butt joint line end, 2-1 electrode connecting line 152f is extended around 1-1 electrode terminal 158t.2-1 electrode connecting line 152f comprises first section or the part that extends to the end from the horizontal HK of 2-1 electrode 132 lower end edges; Second (longitudinal extension) section or part, this part being extended downwards from the end of first along the vertical of battery lead plate 131 between guard electrode 137 and reference electrode are to 138 and 139; With the 3rd (horizontal expansion) part, this part extends to terminals 152t as circuity part and the low side along horizontal HK from second portion by the zone between 1-1 terminals 158t and the cardinal extremity 131k.As shown in Figure 6A, third part is positioned at the bottom of 1-1 electrode terminal 158t.Walk around 1-1 terminals 158t by such extension 2-1 electrode connecting line 152f, 1-1 electrode terminal 158t, 2-1 electrode terminal 152t, 1-2 electrode terminal 159t and 2-2 electrode terminal 153t may be arranged to a row in this order, and electrode, connecting line and terminals form by the single layer of composition.
As shown in Figure 6A, flexible thin film's electrode battery lead plate 131 is divided into three regional 130S, 130B and 130C.First area 130S is a measured zone, and it comprises the first half of narrow rectangle part 131n, conical region 131p and wide rectangle part 131h.Measurement and reference electrode 132,133,138 and 139 are formed at measured zone 130S.The 3rd regional 130C is a join domain, and it comprises the latter half of the wide rectangle part 131h the cardinal extremity 131k near.Electrode terminal 152t, 153t, 158t, 159t and 157t are formed on the join domain 130C.Second area 130B is a bending area that extends between measured zone 130S and 130C.As shown in Figure 5, bending area 130B is a curved shape or crooked zone.
Frame member or support member 141 are illustrated in Fig. 7 well, are installed on the frame member 141 at this situation bottom electrode 131.Frame member 141 is made by nylon 66.The framework at the edge of the measured zone 130S of frame member 141 shapes such as support film battery lead plate 131.Frame member 141 comprises the left side and the right-hand component 141g as upright frame member; Left and right sides internal projection 141b protrudes to inside separately from limit, left and right sides part 141g respectively; Upper support pin 141d, left and right sides intermediate supports pin 141e and left and right sides lower support part 141c.
Shown in Fig. 5 and 7, be installed at liquid level sensor 100 under the assembling situation of fuel tank bottom LT, the measured zone 130S of membrane electrode substrate 131 erects, and makes measured zone 130S quite smooth and parallel with vertical direction V.On the other hand, the join domain 130C of electrode base board 131 and horizontally disposed circuit board 124 be horizontal positioned substantially parallel, and bending area 130B forms 90 ° of bendings between vertical survey zone 130S and the horizontal join domain 130C.
Like this, flexible thin film's battery lead plate 131 is bent to L shaped, and measured zone 130S vertically V extends and join domain along continuous straight runs H extension, and the join domain 130C with electrode terminal is horizontally set on the circuit board 124.Therefore, being electrically connected between electrode terminal and the circuit board 124 is easy and firm.In addition, because circuit board 124 is parallel with join domain 130C, so may reduce the height of liquid level sensor 100.Further may reduce the vertical dimension of liquid level sensor 100 bottoms that are positioned under measured zone 130S or measurement and the reference electrode.Therefore, even also correctly sensed level and specific inductive capacity of liquid level sensor when liquid level is very low.Because coupling part 130C is can be easily under horizontal situation crooked, so when electrode, connecting line and terminals can be formed on the same substrate 131, flexible thin film's electrode base board 131 can promote assembly manipulation.
As shown in Figure 4, guide groove 111g is formed in the narrow tube portion 111n of sender unit cap.111 li of sender unit caps, guide groove 111g on two faces longitudinally AX extend and on horizontal HK toward each other.On every side, the side part 141g of frame member 141 is assemblied among the guide groove 111g of sender unit cap 111.Shown in Fig. 1 and 5,, constituted a plurality of low intercommunicating pore 111c and be used for making oily OL between the inboard outside of sender unit cap 111, to flow in bottom near the sender unit cap 111 of cardinal extremity 111k.On top, exist a plurality of intercommunicating pore 111b of going up to be used for exhaust near the sender unit cap 111 of front end 111s.
Base (or pedestal) member 121 is illustrated by Fig. 1,3 and 5.Substructure member 121 is adapted to be mounted within the bottom LT of fuel tank and supports sender unit cap 111.Substructure member 121 comprises major part 122; Connector part 123, this part comprise the connector terminals 123c that is used to connect external unit; Be inserted in the circuit board 124 between connector terminals 123c and electrode terminal 153t, 159t, 157t, 152t and the 158t.Sensing circuit 161 is formed on the circuit board 124.Circuit board 124 is installed on the major part 122 of substructure member 121.As shown in Figure 5, circuit board 124 seals and is embedded in the resin noggin piece 128.Metal covering 127 is installed in the bottom of substructure member 121 to cover noggin piece 128.
As shown in Figure 3, base major part 122 comprises rivet hole or the screw hole 122b that is used to hold fastener, and this fastener is used for installing major part 122 to fuel tank bottom LT; Form leader 122g by guide groove 122h, guide groove 122h in the horizontal toward each other and support sender unit cap 111.Under the outer lug 111j of sender unit cap 111 assembled situation among the guide groove 122h on the base 121 respectively, sender unit cap 111 was supported by substructure member 121.
Shown in Fig. 1 and 5,2-1 electrode terminal 152t is electrically connected by 2-1 guide pillar 152r and circuit board 124.2-2 electrode terminal 153t is electrically connected by 2-2 guide pillar 153r and circuit board 124.Guard electrode terminals 157t is electrically connected by shielding guide pillar 157r and circuit board 124.1-1 electrode terminal 158t is electrically connected by 1-1 guide pillar 158r and circuit board 124.1-2 electrode terminal 159t is electrically connected to circuit board 124 by 1-2 guide pillar 159r.Guide pillar 152r, 153r, 157r, 158r and 159r are inserted in the interstitial hole of electrode terminal 152t, 153t, 157t, 158t and 159t, and pass through welded and installed.Similarly, circuit board 124 is connected with these guide pillars by welding.
2-1 guide pillar 152r is the part of 2-1 conductive path 152, and conductive path 152 extends to the sensing circuit 161 that is configured on the circuit board 124 from 2-1 electrode 132, and 2-1 guide pillar 152r is corresponding with the 2-1 current-carrying part of 2-1 conductive path 152.2-2 guide pillar 153r is the part of 2-2 conductive path 153, and conductive path 153 extends to the sensing circuit 161 that is configured on the circuit board 124 from 2-2 electrode 133, and 2-2 guide pillar 153r is corresponding with the 2-2 current-carrying part of 2-2 conductive path 153.1-1 guide pillar 158r is the part of 1-1 conductive path 158, and conductive path 158 extends to the sensing circuit 161 that is configured on the circuit board 124 from 1-1 electrode 138, and 1-1 guide pillar 158r is corresponding with the 1-1 current-carrying part of 1-1 conductive path 158.1-2 guide pillar 159r is the part of 1-2 conductive path 159, and conductive path 159 extends to the sensing circuit 161 that is configured on the circuit board 124 from 1-2 electrode 139, and 1-2 guide pillar 159r is corresponding with the 1-2 current-carrying part of 1-2 conductive path 159.
These guide pillars 152r, 153r, 158r and 159r shape are identical with size.As shown in Figure 2, guide pillar 152r, 153r, 158r and 159r are upright and congruent mutually and are parallel to each other.The low side of these guide pillars has been lined up a straight line that the horizontal HK in edge extends, and the high-end straight line of having been lined up a horizontal HK extension in edge.These guide pillars 152r, 153r, 158r and 159r are sealed by thin-film electro pole plate 131, circuit board 124 and noggin piece 128.The resin material of thin-film electro pole plate 131, circuit board 124 and noggin piece 128 all has the specific inductive capacity greater than air.In this example, the specific inductive capacity of the resin material of thin-film electro pole plate 131, circuit board 124 and noggin piece 128 is between ε γ=2.5～3.5.Therefore, be formed at the first stray capacitance Cc1 between 1-1 guide pillar 158r shown in Figure 2 and the 1-2 guide pillar 159r and be formed at the second stray capacitance Cc2 between 2-1 guide pillar 152r and 2-2 guide pillar 153r the trend that becomes big is arranged.
Yet in this embodiment, 1-1,1-2,2-1 and 2-2 guide pillar make first gap between 1-1 guide pillar 158r and the 1-2 guide pillar 159r or equate apart from second gap between G1 and 1-2 guide pillar 159r and the 2-2 guide pillar 153r (or distance) G2 through layout.Therefore, be formed at the first stray capacitance Cc1 between 1-1 guide pillar 158r shown in Figure 2 and the 1-2 guide pillar 159r and be formed at 2-1 guide pillar 152r and 2-2 guide pillar 153r between the second stray capacitance Cc2 equate.Therefore, by using the ratio between the first stray capacitance Cc1 and the second stray capacitance Cc2, may reduce effectively the negative effect that comes from stray capacitance and sensed level exactly.
In addition, these guide pillars 152r, 153r, 158r and 159r are arranged to a row, make these guide pillars be subjected to the influence of surrounding environment identical, and the variation of the two when the ambient environmental conditions such as temperature (for example OL oil temperature) changes of the one the second stray capacitances is identical.Therefore, liquid condition sensing apparatus can be by using the ratio sensed level more accurately between the first stray capacitance Cs1 and the second stray capacitance Cs2, and reduce or eliminate the influence of ambient environmental conditions.
In this embodiment, guide pillar 152r, 153r, 158r and 159r are arranged alternately.In this example, as shown in Figure 2,2-1 guide pillar 152r is between 1-1 and 1-2 guide pillar 158r and 159r; And 1-2 guide pillar 159r is between 2-1 guide pillar 152r and 2-2 guide pillar 153r.
Guide pillar this be arranged alternately make and increase distance (G1) between 1-1 guide pillar 158r and the 1-2 guide pillar 159r and the distance (G2) between 2-1 guide pillar 159r and the 2-2 guide pillar 153r, do not become possibility and do not increase the shared total area of these guide pillars.Therefore, liquid level sensor can reduce stray capacitance Cc1 and Cc2, and further reduces capacitor parasitics Cc1 and the influence of Cc2 to measuring.
As shown in Figure 5, fuel level sensor 100 is installed in fuel tank bottom LT, insert the ring seal 125 of the packing groove 121p that comes from substructure member 121 simultaneously, this installation realizes by the fastener of tightening the fastener hole 122b that inserts substructure member 121 shown in Figure 3 and the internal thread threaded hole that is not screwed into fuel tank bottom LT respectively.As shown in Figure 5, sender unit cap 111 extends upward oil-feed tank from fuel tank bottom LT, makes the axis AX of liquid level sensor 100 vertically extend.
2-1 and 2-2 electrode guide pillar 152r and 153r by connector terminals 123c, circuit board 124 and liquid level sensor 100 are applied in alternating voltage between 2-1 and 2-2 electrode terminal 152t and the 153t from ECU160.By the application of alternating voltage,, come out in that electric flux line between 2-1 and 2-21 electrode 132 and the 133b and between 2-1 and 2-22 electrode 132 and the 133c is manufactured in horizontal (V is vertical with vertical direction) part of the tubular portion 111n of liquid level sensor 100.The second capacitor C s2 of the second capacitor CP2 results from the electric capacity that building-out condenser CP2b between 2-1 and 2-21 electrode 132 and the 133b and the capacitor CP2c between 2-1 and 2-22 electrode 132 and the 133c produce, the second capacitor C s2 with the electric flux line the variation of specific inductive capacity in space of process change.
When liquid level sensor 100 partly immersed oily OL, the electric capacity that vertical direction V goes up per unit length was exposed at variation between the airborne non-immersion part in part and the potential electrode that potential electrode immerses below the pasta.Therefore, the second capacitor C s2 of the second capacitor CP2 is along with the immersion part proportion of potential electrode in vertical direction changes.There is specific relation between the number percent owing to capacitor C s2 that is formed at the capacitor CP2 between potential electrode 132 and 133 and vertical direction immersion part, so may determine the ratio of the immersion part (or immersing partial depth) of potential electrode from the second capacitor C s2.Therefore, the potential electrode of liquid level sensor 100 is to may only measuring the liquid level of oily OL from the second capacitor C s2.
Yet because various such as factor aging and heating, the characteristic of oil changes in time.In addition, specific inductive capacity can change owing to replenishing of dissimilar oil.The variable effect second capacitor C s2 of the characteristic of this oil and the relation between the oil level, thereby the accuracy of infringement level gauging.
Therefore, further the liquid level sensor 100 among the embodiment provides reference electrode to 1-1 and 1-2 electrode 138 and 139 for this reason, in addition also provides potential electrode to 2-1 and 2-2 electrode 132 and 133 (133b and 133c).Reference electrode is positioned at the right below of potential electrode to 1-1 and 1-2 electrode 138 and 139, in this position 1-1 and the always whole immersion oil of 1-2 electrode 138 and 139.The liquid level sensing system of present embodiment is determined the currency of the specific inductive capacity of oil through arranging the first capacitor C s1 that is formed at the capacitor CP1 between 1-1 and 1-2 electrode 138 and 139 by measurement, and by using the second capacitor C s2 that specific inductive capacity revises the second capacitor CP2 to improve the accuracy of level gauging, the second capacitor C s2 is measured by 2-1 and 2-2 electrode 132 and 133.
As shown in Figure 8, the sensing circuit 161 that is configured on the circuit board 124 of liquid level sensor 100 comprises power circuit 163, microprocessor 165, signal output/input circuit 167, on-off circuit 169, first grounding circuit or 170 parts, second grounding circuit or 171 parts.Electric energy offers sensing circuit 161 from ECU160, and at the various piece electric energy (voltage is 5V) that after the waveform of the electric energy that ECU160 provided is removed high fdrequency component, offers sensing circuit 161 by power circuit 163.
Signal input/output circuitry 167 comprises bleeder circuit 181, low-pass filter 182 and current-voltage conversion circuit 183.Bleeder circuit 181 comprises a plurality of resistive elements, and the expectation part (5V) of service voltage is provided from power circuit 163.Bleeder circuit 181 is arranged the output voltage that changes to low-pass filter 182, and this change is to realize by the response connection status to microprocessor 165 command signals that changes resistive element.By changing the staged output voltage, the near sinusoidal waveform that bleeder circuit 181 produces with stepped change.
Low-pass filter 182 obtains the staged sine wave from bleeder circuit 181, and transmits low frequency component.By doing like this, low-pass filter 182 produces level and smooth sine wave from staged is sinusoidal wave, and transmits smooth waveform to on-off circuit 169.The electric current of current-to-voltage converting circuit 183 is from the first electrode pair 1-1 and 1-2 electrode 138 and the 139 or second electrode pair 2-1 and 2-2 electrode 132 and 133 acquisition current waveform signals (transmitting back signal (after passage signal)); Current waveform signal is converted into voltage waveform signal; With provide voltage waveform signal to microprocessor 165.The application number of having announced is that the Japanese patent application kokai of 2003-110364 discloses the circuit that can be used as bleeder circuit 181 and low-pass filter 182.
On-off circuit 169 form by analog switch and be arranged come according to the command signal (switch timing signal) of microprocessor 165 with signal output/input circuit 167 be connected to selectively reference electrode to 1-1 and 1-2 electrode 138 and 139 or potential electrode to 2-1 and 2-2 electrode 132 and 133.Output/input circuit 167 by on-off circuit 169 with sinusoidal signal send reference electrode to or potential electrode to so that measuring-signal to be provided, and current-voltage conversion circuit 183 obtains measuring-signals, and the transmission to the sinusoidal signal of (CP2) obtains this measuring-signal to (CP1) or potential electrode by passing through reference electrode.
Fig. 9 shows the oil level sensing control program of being carried out by microprocessor 165.This control program begins when internal combustion engine starts.First step S110 is used for RAM175, I/O port one 76 and timing register are carried out initialization.
S120 step after S110, microprocessor 165 is carried out reference measure program shown in Figure 10.First step S210 in reference measure program shown in Figure 10, microprocessor 165 produce the switch timing signals with select reference electrode to 1-1 and 1-2 electrode 138 and 139 as purpose of connecting ground, and therefore driving switch circuit 169 with signal output/input circuit 167 and reference electrode to being connected.
In the S220 step, microprocessor 165 produces shielding conversion timing signal with conducting second grounding circuit 171, and therefore makes second grounding circuit 171 be in conducting state so that 2-1 connecting path 152 and 2-2 connecting path 153 are connected to ground wire.In addition, microprocessor 165 produces shielding conversion timing signals cutting out first grounding circuit 170, and therefore make first grounding circuit 170 be in off-state so that reference electrode 138 and 139 with the ground wire disconnection.
Therefore, the 2-1 guide pillar 152r between 1-1 and 1-2 guide pillar 158r and 159r and 2-2 guide pillar 153r uses as ground-electrode, and therefore has remarkable reduction to be formed at the function of the first stray capacitance Cc1 between 1-1 and 1-2 guide pillar 158r and 159r.The result, influence liquid level sensing system sensing 1-1 and 1-2 electrode 138 and 139 s' the first capacitor C s1 exactly by what reduce by the first stray capacitance Cc1, the first stray capacitance Cc1 constitutes the most of stray capacitance between 1-1 conductive path 158 and the 1-2 conductive path 159.
At step S230, microprocessor 165 will be imported the waveform generation command signal and send to output/input circuit 167, drive bleeder circuit 181, and make low-pass filter 182 produce the staged sine wave.By doing like this, output/input circuit 167 (bleeder circuit 181 and low-pass filter 182) sends measuring-signal (sinusoidal signal) to reference electrode right 1-1 electrode 138 by on-off circuit 169.
At step S240, microprocessor 165 is carried out the operation of obtaining output signal from output/input circuit 167 (current-voltage conversion circuit 183).The signal that obtains from output/input circuit 167 is to transmit back signal (with reference to transmitting the back signal), and this signal generates through reference electrode 138 and the 139 capacitor CP1 that form by making measuring-signal (sinusoidal signal).
At step S250, microprocessor 165 is carried out the operation of calculating the amplitude peak (with reference to amplitude peak) of signal waveform after the transmission of obtaining from output/input circuit 167 (current-voltage conversion circuit 183).Proportional with reference to the amplitude peak and the first capacitor C s1 that transmit the back signal, and the first capacitor C s1 depends on the specific inductive capacity of oil.Therefore, shown oily specific inductive capacity with reference to amplitude peak.After step S250, microprocessor 165 turns back to the oil level detection procedure of Fig. 9, and carries out step S130.
At step S130, microprocessor 165 is carried out oil-level measurement program shown in Figure 11.First step S310 in oil-level measurement program shown in Figure 11, microprocessor 165 produce the switch timing signals with select potential electrode to 2-1 and 2-2 electrode 132 and 133 as purpose of connecting ground, and therefore driving switch circuit 169 with will export/input circuit 167 and potential electrode be to being connected
At step S320, microprocessor 165 produces shielding conversion timing signals cutting out second grounding circuit 171, and therefore make second grounding circuit 171 be in closed condition so that potential electrode to 132 and 133 and ground wire disconnect.In addition, microprocessor 165 produces shielding conversion timing signals opening first grounding circuit 170, and therefore makes first grounding circuit 170 be in opening so that 1-1 conductive path 158 is connected with ground wire with 1-2 conductive path 159.
Therefore, therefore the 1-2 guide pillar 159r between 2-1 and 2-2 guide pillar 152r and 153r and 1-1 guide pillar 158 as ground-electrode, and has remarkable reduction to be formed at the function of the second stray capacitance Cc2 between 2-1 and 2-2 guide pillar 152r and 153r.The result, influence liquid level sensing system sensing 2-1 and 2-2 electrode 132 and 133 s' the second capacitor C s2 exactly by what reduce by the second stray capacitance Cc2, the second stray capacitance Cc2 constitutes the most of stray capacitance between 2-1 conductive path 152 and the 2-2 conductive path 153.
At step S330, microprocessor 165 transmits defeated waveform generation command signal and gives output/input circuit 167, drives bleeder circuit 181, and makes low-pass filter 182 produce the staged sine wave.By doing like this, output/input circuit 167 (bleeder circuit 181 and low-pass filter 182) transmits measuring-signal (sinusoidal signal) to the right 2-1 electrode 132 of potential electrode by on-off circuit 169.
At step S340, microprocessor 165 is carried out the operation of obtaining output signal from output/input circuit 167 (current-voltage conversion circuit 183).The signal that obtains from output/input circuit 167 is to transmit back signal (measure and transmit the back signal), and this signal produces through the capacitor CP2 that is formed by potential electrode 132 and 133 by making measuring-signal (sinusoidal signal).
At step S350, microprocessor 165 is carried out the amplitude peak (measurement amplitude peak) of calculating signal waveform after the transmission of obtaining from output/input circuit 167 (current-voltage conversion circuit 183).It is proportional to measure the amplitude peak and the second capacitor C s2 that transmit the back signal, and the second capacitor C s2 depends on the shared number percent of part that immerses in the oil.Therefore, measure amplitude peak and indicate oil level.After step S350, microprocessor 165 turns back to the oil level detection procedure of Fig. 9, and carries out step S140.
At the step S140 of Fig. 9, microprocessor 165 is carried out oil level calculation procedure shown in Figure 12.At first step S410 shown in Figure 12, microprocessor 165 usefulness step S120 (Figure 10) calculate the reference amplitude peak of gained and the measurement amplitude peak calculating oil level that step S130 (Figure 11) calculates gained.In this example, microprocessor 165 calculates the first capacitor C s1 by the reference amplitude peak, and calculates the second capacitor C s2 by measuring amplitude peak.Then, the ratio that microprocessor 165 is determined between the first and second capacitor C s1 and the Cs2, and by the ratio calculating oil level of determining like this.
At step S420, microprocessor 165 is carried out PWN written-out program shown in Figure 13.At the first step S510 of Figure 13, microprocessor 165 is carried out the operation of the oil level generation pulse width data that calculates according to the oil level calculation procedure.Pulse width data comprises pulse width Hi data and pulse width Lo data at least, and the Hi data comprise the high level output time of pwm signal, and the Lo data comprise the low level output time of pwm signal.At step S510, pulse width data is determined and makes the high level output time increase with the rising of oil level.
At step S520, microprocessor 165 determines whether current execution is first output that is used for pwm signal.Then, under the situation that is, microprocessor 165 carries out step S530; Under the situation of denying, then stop the program of Figure 13.At step S530, microprocessor 165 is carried out the operation of the ready pulse width Hi data of step S510 being passed to timing register.
Then, microprocessor 165 is set to high level at the output state of step S540 pwm signal, and begins output pwm signal at step S550.After the step S550, microprocessor 165 stops the PWM written-out program of Figure 13, and restarts the liquid level calculation procedure of Figure 12.When beginning pwm signal output at step S550, timer begins to measure the elapsed time.After this, when time past tense, carry out timer interrupt program corresponding to the set pulse width Hi data of step S530.
Figure 14 shows timer interrupt program.At the first step of the step S610 of Figure 14, microprocessor 165 checks whether the output state of pwm signals is set to high level.From step S610, under the situation that is (the PWM output state is set to high level), microprocessor 165 carries out step S620; Under the situation of denying, microprocessor 165 carries out step S640.At step S620, microprocessor 165 is set to the ready pulse width data Lo of the step S510 of PWM written-out program on the timing register.Then, at step S630, the output state of microprocessor 165 pwm signals is set to low level.
On the other hand, at step S640, ready pulse width Hi data are provided with to the timing register among the step S510 of microprocessor 165 with the PWM written-out program.Then, at step S650, the output state of microprocessor 165 pwm signals is set to high level.
After step S630 or the step S650, microprocessor 165 carries out the S660 step, and the operation of beginning output pwm signal.When pwm signal output beginning, timer begins to measure the elapsed time, and the elapsed time of measuring gained surpasses the time that timing register sets, and timer interrupt program is performed.By the PWM written-out program of Figure 13 and the timer interrupt program of Figure 14, sensing circuit 161 is according to the liquid level commutation pulse width data (high level output time and low level output time) of the liquid level calculation procedure calculating of Figure 12.Therefore, in this example, liquid level sensor 100 is with the liquid level OL of the form circular ECU160 oil of pwm signal.
After the PWM written-out program was finished, microprocessor 165 returned the oil level sensing control program of Fig. 9, and returned step S120 after step S140.Like this, microprocessor 165 calculates oil levels and provides result of calculation to ECU160 by the step S110-S140 that repeats Fig. 9.
The manufacturing course of liquid condition sensor further is included in the step that is provided with that thin-film electro pole plate 131 is set on the frame member 141 shown in Figure 7.In the example that illustrates, the narrow rectangle part 131n of membrane electrode (base) plate 131 is set between internal projection 141b and the supporting walls 141f, and the upper support pin 141d of frame member 141 is by the last through hole 131f insertion of battery lead plate 131.In addition, cardinal extremity 131k on the wide rectangle part 131h of thin-film electro pole plate 131 is installed in the groove of lower support part 141c of frame member 141, and the intermediate supports pin 141e of frame member 141 inserts by the intermediate throughholes 131e of thin-film electro pole plate 131 shown in Figure 7, and is deformed to pass through riveted joint or welding with membrane electrode 131 and 141 combinations of frame member.
Liquid condition sensor manufacturing course further comprises the Connection Step of connection electrode plate 131 and circuit board 124.In the example that illustrates, at first, the frame member 141 that comprises thin-film electro pole plate 131 is installed on the substructure member 121 that comprises circuit board 124.Thereby frame member 141 and substructure member 121 are installed into by the outer lug 141h that will be formed at frame member 141 bottoms and are formed at substructure member 121 corresponding recesses by being combined.In addition, electrode terminal 153t, 158t, 157t, 152t and 159t link to each other with circuit board 124 by guide pillar 153r, 158r, 157r, 152r and 159r.The top of each guide pillar and bottom are installed to the respective terminal of battery lead plate 131 and circuit board 124 by known solder technology.
Then, noggin piece 128 forms by the inner space that is filled with circuit board 124 with resin, and metal covering 127 is fixed to the bottom of substructure member 121 to cover noggin piece 128.Annular seal 125 is installed to the annular packing groove 121p that is formed at abutment surface, and this abutment surface is substructure member and surface fuel tank bottom surface adjacency.Liquid level sensor 100 is finished thus.
Therefore, the manufacturing course of liquid condition sensor comprises the preparation process of formation such as the battery lead plate of thin-film electro pole plate 131, step is set and is electrically connected battery lead plate and the Connection Step of sensing circuit such as having the L shaped structural of vertical area, horizontal zone and bending area what battery lead plate was set to that the front determines.
Though the present invention is by above obtaining description with reference to specific embodiment of the present invention, the present invention is not limited to above-described embodiment.According to theory of the present invention, those skilled in the art can revise and changes the foregoing description.For example, can replace two 2-2 electrodes 133 of being made up of two single electrode 133b and 133c with single 2-2 electrode, this single 2-2 electrode only has one and 2-1 electrode 132 electrode of opposite to form single capacitor.
In the illustrated embodiment, 1-1,1-2,2-1 and 2-2 guide pillar equate through being arranged so that first gap between 1-1 guide pillar 158r and the 1-2 guide pillar 159r (or distance) G1 and second gap (or distance) G2 between 1-2 guide pillar 159r and the 2-2 guide pillar 153r, and make be formed at the first stray capacitance Cc1 between 1-1 guide pillar 158r and the 1-2 guide pillar 159r and be formed at 2-1 guide pillar 152r and 2-2 guide pillar 153r between the second stray capacitance Cc2 equate.Therefore, by using the ratio between first electric capacity and second electric capacity, the condenser type liquid condition sensing apparatus can reduce the negative effect that comes from stray capacitance and sensing liquid condition exactly effectively.
In addition, these guide pillars 152r, 153r, 158r and 159r are formed a line compactly, it is identical to make these guide pillars be subjected to the influence of surrounding environment, and the one the second stray capacitance variations of the two when the ambient environmental conditions such as temperature (for example temperature of oily OL) changes are identical.Therefore, liquid condition sensing apparatus can be by using the ratio sensed level more accurately between the first stray capacitance Cs1 and the second stray capacitance Cs2, and reduce or eliminate the influence that ambient environmental conditions changes.
Liquid condition by the liquid condition sensing apparatus sensing can be liquid level, liquid dielectric, or the like.Measured liquid is the liquid with the specific inductive capacity that is different from air.For example, this liquid can be engine oil, gasoline (or other fuel), or machine oil.
1-1,1-2,2-1 and 2-2 electrode can form with various forms.For example, these electrodes can be the forms of conductive layer, for example the Copper Foil on plate-like printed circuit board (PCB), flexible print wiring board or the film-substrate; It perhaps can be the form of rod, pipe or plate-like metalwork.
1-1,1-2,2-1 and 2-2 conductive path can form with various forms.For example, these conductive paths can be whole or in part form with the form of the conductive layer on P.e.c. or terminal block or other substrate, or form with the form of bar-shaped guide pillar, or form with the form such as the lead-in wire of twisted wire.
1-1,1-2,2-1 and 2-2 current-carrying part can arranged alternate.For example, the 2-1 current-carrying part is between 1-1 and 1-2 current-carrying part; And the 1-2 current-carrying part is between 2-1 and 2-2 current-carrying part.
This arranged alternate to current-carrying part makes in distance between increase 1-1 and the 1-2 current-carrying part and the distance between 2-1 and the 2-2 current-carrying part under the situation of the total area that does not increase current-carrying part becomes possibility.Therefore, liquid condition sensing apparatus can reduce stray capacitance between 1-1 and the 1-2 current-carrying part and the electric capacity between 2-1 and the 2-2 current-carrying part, and therefore further reduces the influence of capacitor parasitics to measuring.
1-1,1-2,2-1 and 2-2 current-carrying part can be sealings or be buried in 1-1,1-2,2-1 and 2-2 guide pillar in the material that dielectric coefficient is higher than air.In this case, though stray capacitance may be relatively large, liquid condition sensing apparatus can reduce the influence that stray capacitance is measured liquid condition.
Sensing circuit can comprise the first grounding circuit part that makes 1-1 conductive path and 1-2 conductive path ground connection; Make the second grounding circuit part of 2-1 conductive path and 2-2 conductive path ground connection; With the capacitance measurement part, this part is measured the electric capacity of first electric capacity under the first measurement state, under the first measurement state at least one of 1-1 conductive path and 1-2 conductive path be not grounded, and 2-1 conductive path and 2-2 conductive path are all by the second grounded part ground connection, and measure second electric capacity under the second measurement state, under the second measurement state in 2-1 conductive path and the 2-2 conductive path at least one is not grounded, and 1-1 conductive path and 1-2 conductive path are all by the first grounded part ground connection.
Therefore, in the situation that measurement first electric capacity carries out, therefore the 2-1 part of ground connection, plays the effect of the stray capacitance between further reduction 1-1 and the 1-2 part between 1-1 and 1-2 part.In addition, this layout has reduced the possibility that produces noise in the first capacitance measurement program.Similarly, under the situation that second electric capacity is measured, the 1-2 of ground connection part is between 2-1 and 2-2 part, and therefore, the stray capacitance that has further reduced between 2-1 and the 2-2 part is disturbed to reduce.As a result, the influence of stray capacitance is lowered, and the accuracy of measuring is improved.
The Jap.P. of the 2006-135632 that the present invention is based on the Jap.P. of the 2005-195087 that applies for 4 days previous July in 2005 and apply for 15 days previous March in 2006.The full content of 2005-195087 and these Japanese patent applications of 2006-135632 is incorporated into herein in the reference mode.
Though more than by invention has been described with reference to some embodiment of the present invention, the present invention is not limited to above-described embodiment.Scope of the present invention limits with reference to following claim.
Claims (14)
1. a condenser type liquid condition sensing apparatus immerses liquid at least in part with the sensing liquid condition, and this liquid condition sensing apparatus comprises:
By first electrode pair that 1-1 electrode and 1-2 electrode constitute, be arranged and form first electric capacity that changes with liquid condition;
By second electrode pair that 2-1 electrode and 2-2 electrode constitute, be arranged and form second electric capacity that changes with liquid condition;
Be formed with the circuit board of sensing circuit, be used for monitoring first and second electric capacity and come the sensing liquid condition according to first and second electric capacity;
The 1-1 conductive path is connected to the 1-1 electrode sensing circuit and comprises the 1-1 current-carrying part;
The 1-2 conductive path is connected to the 1-2 electrode sensing circuit and comprises the 1-2 current-carrying part;
The 2-1 conductive path is connected to the 2-1 electrode sensing circuit and comprises the 2-1 current-carrying part; With
The 2-2 conductive path is connected to the 2-2 electrode sensing circuit and comprises the 2-2 current-carrying part;
1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part are arranged to a row, and extend abreast; And
1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part are arranged such that first stray capacitance that is formed between 1-1 current-carrying part and the 1-2 current-carrying part equates with second stray capacitance that is formed between 2-1 current-carrying part and the 2-2 current-carrying part.
2. condenser type liquid condition sensing apparatus as claimed in claim 1, wherein, 1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part are arranged such that partly the distance of first between 1-1 current-carrying part and the 1-2 current-carrying part equates with the second distance that is formed between 2-1 current-carrying part and the 2-2 current-carrying part.
3. condenser type liquid condition sensing apparatus as claimed in claim 1, wherein, 1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part partly are parallel to each other; And wherein 1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part partial shape and size are mutually the same.
4. condenser type liquid condition sensing apparatus as claimed in claim 1, wherein, 1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part are respectively 1-1 guide pillar, 1-2 guide pillar, 2-1 guide pillar and 2-2 guide pillar, and each guide pillar surrounded by dielectric of specific inductive capacity greater than air.
5. condenser type liquid condition sensing apparatus as claimed in claim 1, wherein the 2-1 current-carrying part extends between 1-1 current-carrying part and 1-2 current-carrying part, and the 1-2 current-carrying part extends between 2-1 current-carrying part and 2-2 current-carrying part part.
6. as each described condenser type liquid condition sensing apparatus among the claim 1-5, wherein
The 1-1 conductive path further comprises the 1-1 terminals that are connected by welding to the 1-1 current-carrying part, with the 1-1 connecting line that the 1-1 electrode is linked to each other with the 1-1 terminals;
The 1-2 conductive path further comprises the 1-2 terminals that are connected by welding to the 1-2 current-carrying part, with the 1-2 connecting line that the 1-2 electrode is linked to each other with the 1-2 terminals;
The 2-1 conductive path further comprises the 2-1 terminals that are connected by welding on the 2-1 current-carrying part, with the 2-1 connecting line that the 2-1 electrode is linked to each other with the 2-1 terminals;
The 2-2 conductive path further comprises the 2-2 terminals that are connected by welding on the 2-2 current-carrying part, with the 2-2 connecting line that the 2-2 electrode is linked to each other with the 2-2 terminals; And
1-1 electrode, 1-2 electrode, 2-1 electrode and 2-2 electrode, 1-1 connecting line, 1-2 connecting line, 2-1 connecting line and 2-2 connecting line, and 1-1 terminals, 1-2 terminals, 2-1 terminals and 2-2 terminals all are integrally formed on the battery lead plate.
7. condenser type liquid condition sensing apparatus as claimed in claim 6, wherein, 1-1,1-2 electrode, 2-1 electrode and 2-2 electrode, 1-1 connecting line, 1-2 connecting line, 2-1 connecting line and 2-2 connecting line, and 1-1 terminals, 1-2 terminals, 2-1 terminals and 2-2 terminals all are formed on the simple layer in the battery lead plate.
8. condenser type liquid condition sensing apparatus as claimed in claim 6, wherein, battery lead plate is a flex plate, and comprises:
Vertical area forms 2-1 and 2-2 electrode in this zone;
Horizontal zone forms 1-1 terminals, 1-2 terminals, 2-1 terminals and 2-2 terminals in this zone; With
Bending area, this zone are crooked between vertical area and horizontal zone; And
This circuit board is faced mutually with the horizontal zone of flex plate.
9. condenser type liquid condition sensing apparatus as claimed in claim 6, wherein, the first end in the through hole of each current-carrying part from be inserted into corresponding terminals that are formed at the battery lead plate extends with the second end that is inserted in the corresponding through hole that is formed in the circuit board.
10. condenser type liquid condition sensing apparatus as claimed in claim 7, wherein, the 2-1 connecting line comprises and detours the 1-1 terminals and extend through the circle segment in a zone, described zone be configured such that the 1-1 terminals first electrode pair and should the zone between.
11. condenser type liquid condition sensing apparatus as claimed in claim 10, wherein the 1-1 connecting line comprises the longitudinal extension part, this longitudinal extension part is along the longitudinal extension of battery lead plate, the 1-1 electrode is connected with the 1-1 terminals, and the 2-1 connecting line comprises the longitudinal extension part, this longitudinal extension part is partly extended along the longitudinal extension of 1-1 connecting line, and described circle segment is connected with the 2-1 terminals along the horizontal expansion of battery lead plate and with the longitudinal extension part of 2-1 connecting line, the 1-1 terminals are in the vertical between the circle segment of the longitudinal extension of 1-1 connecting line part and 2-1 connecting line, and in the horizontal between the longitudinal extension part of 2-1 terminals and 2-1 connecting line divides.
12. condenser type liquid condition sensing apparatus as claimed in claim 11, wherein 1-1 terminals, 1-2 terminals, 2-1 terminals and 2-2 terminals battery lead plate transversely be arranged to a row, and the 2-1 terminals are in the horizontal between 1-1 terminals and 1-2 terminals.
13. condenser type liquid condition sensing apparatus as claimed in claim 5, wherein the sensing circuit of battery lead plate comprises:
Make first grounded part of 1-1 conductive path and 1-2 conductive path ground connection;
Make second grounded part of 2-1 conductive path and 2-2 conductive path ground connection; With
The capacitance measurement part, this part is used for measuring first electric capacity under the first measurement state, and second electric capacity of measurement under the second measurement state, under the first measurement state in 1-1 conductive path and the 1-2 conductive path at least one is earth-free, and 2-1 conductive path and 2-2 conductive path are all by the second grounded part ground connection; Under the second measurement state in 2-1 conductive path and the 2-2 conductive path at least one is earth-free, and 1-1 conductive path and 1-2 conductive path are all by the first grounded part ground connection.
14. a condenser type liquid condition sensing apparatus immerses the liquid condition of liquid with sensing liquid at least in part, this liquid condition sensing apparatus comprises:
By first electrode pair that 1-1 electrode and 1-2 electrode constitute, be arranged and form first electric capacity that changes with liquid condition;
By second electrode pair that 2-1 electrode and 2-2 electrode constitute, be arranged second electric capacity that forms with another state variation of liquid;
Be formed with the circuit board of sensing circuit, be used to monitor first and second electric capacity and according to first and second electric capacity with the sensing liquid condition;
The 1-1 conductive path is connected to sensing circuit with the 1-1 electrode, and comprises the 1-1 current-carrying part;
The 1-2 conductive path is connected to sensing circuit with the 1-2 electrode, and comprises the 1-2 current-carrying part;
The 2-1 conductive path is connected to sensing circuit with the 2-1 electrode, and comprises the 2-1 current-carrying part; With
The 2-2 conductive path is connected to sensing circuit with the 2-2 electrode, and comprises the 2-2 current-carrying part;
Wherein, 1-1 current-carrying part, 1-2 current-carrying part, 2-1 current-carrying part and 2-2 current-carrying part are arranged to a row, and extend abreast; And
Wherein, the 2-1 current-carrying part extends between 1-1 current-carrying part and 1-2 current-carrying part, and the 1-2 current-carrying part extends between 2-1 current-carrying part and 2-2 current-carrying part,
Wherein sensing circuit comprises:
Make first grounded part of 1-1 conductive path and 1-2 conductive path ground connection;
Make second grounded part of 2-1 conductive path and 2-2 conductive path ground connection; And
The capacitance measurement part, be used for measuring first electric capacity under the first measurement state, and second electric capacity of measurement under the second measurement state, under the first measurement state in 1-1 conductive path and the 1-2 conductive path at least one is earth-free, and 2-1 conductive path and 2-2 conductive path are all by the second grounded part ground connection; Under the second measurement state in 2-1 conductive path and the 2-2 conductive path at least one is earth-free, and 1-1 conductive path and 1-2 conductive path are all by the first grounded part ground connection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005195087 | 2005-07-04 | ||
| JP2005195087 | 2005-07-04 | ||
| JP2006135632 | 2006-05-15 |
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| CN1892189A CN1892189A (en) | 2007-01-10 |
| CN100557391C true CN100557391C (en) | 2009-11-04 |
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| CNB2006101062049A Expired - Fee Related CN100557391C (en) | 2005-07-04 | 2006-07-04 | Liquid condition sensing apparatus |
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| JP2013003088A (en) * | 2011-06-21 | 2013-01-07 | Aisan Ind Co Ltd | Liquid sensor |
| CN106197530B (en) * | 2015-05-08 | 2021-06-08 | 丹佛斯（天津）有限公司 | Method for measuring dilution of lubricating oil, sensor and method for detecting oil level |
| CN111796006A (en) * | 2020-06-17 | 2020-10-20 | 新乡航空工业(集团)有限公司 | Laminated oil quantity detection sensor for aviation turbine |
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