CN105136250A - Oil level detection device and detection method for fuel oil tank - Google Patents
Oil level detection device and detection method for fuel oil tank Download PDFInfo
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- CN105136250A CN105136250A CN201510585803.2A CN201510585803A CN105136250A CN 105136250 A CN105136250 A CN 105136250A CN 201510585803 A CN201510585803 A CN 201510585803A CN 105136250 A CN105136250 A CN 105136250A
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Abstract
The invention discloses an oil level detection device and detection method for a fuel oil tank. The oil level detection device for the fuel oil tank comprises the fuel oil tank, a slide rheostat, a first resistor, a second resistor, an ECU and a meter; a floater floats on the surface of fuel oil in the fuel oil tank and is connected with a slide sheet of the slide rheostat, one end of the slide rheostat is connected with voltage V through the first resistor connected in series, the slide sheet of the slide rheostat is grounded through a second resistor connected in parallel, the end, connected with the first resistor in series, of the slide rheostat is connected to the ECU and outputs the voltage V1, the other end of the slide rheostat is connected to the ECU and outputs the voltage V2, and the meter is connected to the output end of the ECU. According to an oil level sensor used for a car and the implementation method thereof, two ways of the voltage V1 and V2 are collected and input, the fuel oil capacity in the fuel oil tank is obtained through calculation, the interference of contact resistance of the slide rheostat is eliminated, and the more accurate calculation result can be obtained.
Description
Technical field
The application relates to a kind of oil level detecting device and detection method of fuel tank.
Background technology
Vehicle oil level sensor provides the information of the oil mass in motor vehicle fuel tank for driver, is convenient to driver's in good time fuel up before fuel oil exhausts.
Refer to Fig. 1, existing vehicle oil level sensor comprises fuel tank 13, slide rheostat 10, resistance 1, ECU (electronic control unit) 15 and instrument 16.Wherein the height (wherein holding the height of the accommodation space of fuel oil) of fuel tank 13 is H, and the height of its intermediate fuel oil is Hm.There is in fuel tank 13 float 14 and swim in fuel oil surface.One end ground connection of slide rheostat 10, the other end meets voltage V by the resistance 1 of series connection.The all-in resistance of slide rheostat 10 is R, and the variable resistor obtained by slide plate 11 is Rm, and the position of slide plate 11 on slide rheostat 10 is subject to the control of float 14.The resistance of resistance one is Rc.Usually, the total length of slide rheostat 10 equals the height of fuel tank 13, so just makes float 14 position and slide plate 11 position one_to_one corresponding.Slide plate 11 exports variable voltage Vm to ECU15.ECU obtains the oil mass information in fuel tank 13 through computing, and is reflected in instrument 16.
Refer to Fig. 2, the ECU15 in existing vehicle oil level sensor comprises the analog to digital converter 151, arithmetic element 152 and the wave filter 153 that are connected successively.Wherein, variable voltage Vm is carried out analog to digital conversion by analog to digital converter 151.Arithmetic element 152 calculates the fuel quantity Vol in fuel tank 153 according to Vm.Oil level in the situation such as vehicle acceleration, road bump lower fuel tank 153 can produce fluctuation, and wave filter 153 carries out time filtering according to current vehicle speed and acceleration to the fuel oil volume calculated, and can eliminate the impact of instantaneous oil level saltus step.
Described arithmetic element 152 calculates Vol according to Vm and is divided into two steps: being first calculate Rm according to Vm, is then table look-up according to Rm to obtain Vol.In the ideal case, by the formula of Vm calculating Rm be:
the source of this formula be flow through the electric current of resistance 1 should be equal with the electric current flowing through slide rheostat 10, namely
because Vm path is connected in the high impedance analog to digital converter of ECU15, therefore think and Vm path does not have electric current to pass through.
Although to be shown as sectional area equal for fuel tank 13 in Fig. 1, in practical application, fuel tank 13 may be irregularly shaped, and therefore each fuel level sensor has the form between a Vol and Rm for inquiry, can namely know that Rm can converse Vol.After ECU15 obtains Rm, according to the conversion form between built-in Rm and Vol, can inquire about and obtain Vol.
In practical application, slide rheostat is slided on resistive band by a sliding point, thus realize the effect of resistance-variable.Due to the impact of the impurity in fuel oil and corrosion, the impurity of a constant impedance can be produced between the sliding point of slide rheostat with resistive band, be called contact resistance Re.After considering contact resistance Re, the formula being calculated Rm by Vm is:
be difficult to measure, contain contact resistance in the effective resistance of the therefore slide rheostat of actual computation, this can cause the oil mass Vol calculated lower than true oil mass.Under extreme case, when vehicle just starts, instrument just shows empty fuel tank.
Summary of the invention
The object of the present invention is to provide a kind of oil level detecting device and detection method of fuel tank, to overcome deficiency of the prior art.
For achieving the above object, the invention provides following technical scheme:
The embodiment of the present application discloses a kind of oil level detecting device of fuel tank, comprise: fuel tank, slide rheostat, resistance one, resistance two, ECU and instrument, described fuel tank intermediate fuel oil surface flotation has float, described float is connected with the slide plate on described slide rheostat, one end of described slide rheostat meets voltage V by the resistance one of series connection, slide plate on described slide rheostat is by resistance two ground connection in parallel, and one end that described slide rheostat is connected with resistance one is connected to ECU and output voltage V
1, the other end of described slide rheostat is connected to ECU and output voltage V
2, described Instrument connection is in the output terminal of described ECU.
Preferably, in the oil level detecting device of above-mentioned fuel tank, described ECU comprises two analog to digital converters, V
1and V
2sampling module, V
1and V
2backup module, V
1and V
2diagnostic module, arithmetic element one, arithmetic element two, R
mbackup module, R
mdefault module, R
mdiagnostic module and wave filter, described two analog to digital converters are respectively to the voltage V of input
1, V
2carry out analog to digital conversion and export to V
1and V
2sampling module; Described V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2whether be worth reasonable; When rationally, by V
1and V
2v in sampling module
1and V
2value exports to arithmetic element one; When unreasonable, then by V
1and V
2the last time stored in backup module is judged as rational V
1and V
2value exports to arithmetic element one; Described arithmetic element one is according to V
1and V
2value calculates the variable resistance R of slide rheostat
m; Described R
mdiagnostic module judges the R that arithmetic element one calculates
mwhether be worth reasonable; When rationally, by the R that arithmetic element one calculates
mvalue exports to arithmetic element two; When unreasonable, by R
mthe last time stored in backup module is judged as rational R
mvalue or R
mthe R that default module prestores
mdefault value exports to arithmetic element two; Described arithmetic element two is according to R
mvalue calculates fuel tank intermediate fuel oil amount Vol and exports to wave filter; Described wave filter carries out filtering to described Vol value, removes short-term saltus step impact, and exports to instrument.
Preferably, in the oil level detecting device of above-mentioned fuel tank, described V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value, when there is any one or multiple of following situation, namely thinking unreasonable, otherwise namely thinking reasonable:
V-Δ V < V
1, described Δ V for judging the rationality of V1,0 < Δ V≤0.5 volt;
V
1≤V
2；
V
2＝0。
Preferably, in the oil level detecting device of above-mentioned fuel tank, described R
mdiagnostic module judges the R that arithmetic element one calculates
mwhether value is reasonable, as 0≤R
m≤ R, described R are the total resistance value of slide rheostat, and it is reasonable namely to think, otherwise namely think unreasonable.
Disclosed herein as well is the detection method of oil level in a kind of fuel tank, comprise step:
(1) buoys float, in fuel tank, on fuel oil surface, is followed the change of fuel capacity and changes the height in fuel tank, and described float drives the slide plate on slide rheostat to change position;
(2), the slide rheostat one end of connecting with resistance one is to ECU output voltage V
1, the other end of slide rheostat is to ECU output voltage V
2;
(3), two analog to digital converters are respectively to V
1, V
2carry out analog to digital conversion and export to V
1and V
2sampling module;
(4), V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value, when there is any one or multiple of following situation, namely thinking unreasonable, otherwise namely thinking reasonable:
V-Δ V < V
1, described Δ V is for judging V
1rationality, 0 < Δ V≤0.5 volt;
V1≤V
2；
V
2＝0；
Work as V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value is reasonable, then by V
1and V
2v1 and V in sampling module
2value exports to arithmetic element one, simultaneously by this V
1and V
2value is kept at V
1and V
2in backup module;
Work as V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2be worth unreasonable, then by V
1and V
2the last time stored in backup module is judged as rational V1 and V
2value exports to arithmetic element one;
(5), arithmetic element one calculates the variable resistance R of slide rheostat
m, wherein Rc is the resistance value of resistance one;
(6), R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue, as 0≤R
m≤ R, described R are the total resistance value of slide rheostat, and it is reasonable namely to think, otherwise namely think unreasonable:
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue rationally, then by R that arithmetic element one calculates
mvalue exports to arithmetic element two, simultaneously by this R
mvalue is kept at R
min backup module;
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue unreasonable and duration is less than first threshold, then by R
mthe last time stored in backup module is judged as rational R
mvalue exports to arithmetic element two;
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue unreasonable and duration is more than or equal to first threshold, then by R
mthe R prestored in default module
mdefault value exports to arithmetic element two;
0 < first threshold≤600 second;
(7), arithmetic element two is tabled look-up and is obtained fuel tank intermediate fuel oil amount Vol and export to wave filter;
(8), wave filter carries out time filtering to described Vol value, and exports to instrument;
(9) fuel capacity, in Instrument use Vol value display fuel tank.
Compared with prior art, the invention has the advantages that: vehicle oil level sensor of the present invention and its implementation gather two-way voltage input V
1and V
2, by calculating the fuel capacity in fuel tank, eliminate the interference of the contact resistance of slide rheostat, and result of calculation more accurately can be obtained.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Figure 1 shows that the principle schematic of fuel level sensor in prior art;
Figure 2 shows that the principle schematic of ECU in prior art;
The principle schematic of fuel level sensor in the specific embodiment of the invention shown in Fig. 3;
The equivalent circuit diagram of active component in fuel level sensor in the specific embodiment of the invention shown in Fig. 4.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be described in detail the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Shown in ginseng Fig. 3 to Fig. 4, the oil level detecting device of fuel tank comprises: fuel tank 23, slide rheostat 20, resistance 1, resistance 2 27, ECU25 and instrument 26, fuel tank intermediate fuel oil surface flotation has float 24, float 24 is connected with the slide plate 21 on slide rheostat 20, one end of slide rheostat 20 meets voltage V by the resistance 1 of series connection, slide plate 21 on slide rheostat 20 is by resistance 2 27 ground connection in parallel, and one end that slide rheostat 20 is connected with resistance 1 is connected to ECU and output voltage V
1, the other end of slide rheostat 20 is connected to ECU and output voltage V
2, instrument 26 is connected to the output terminal of ECU.
ECU comprises two analog to digital converters, V
1and V
2sampling module, V
1and V
2backup module, V
1and V
2diagnostic module, arithmetic element one, arithmetic element two, R
mbackup module, R
mdefault module, R
mdiagnostic module and wave filter, two analog to digital converters are respectively to the voltage V of input
1, V
2carry out analog to digital conversion and export to V
1and V
2sampling module; V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2whether be worth reasonable; When rationally, by V
1and V
2v in sampling module
1and V
2value exports to arithmetic element one; When unreasonable, then by V
1and V
2the last time stored in backup module is judged as rational V
1and V
2value exports to arithmetic element one; Arithmetic element one is according to V
1and V
2value calculates the variable resistance R of slide rheostat
m; R
mdiagnostic module judges the R that arithmetic element one calculates
mwhether be worth reasonable; When rationally, by the R that arithmetic element one calculates
mvalue exports to arithmetic element two; When unreasonable, by R
mthe last time stored in backup module is judged as rational R
mvalue or R
mthe R that default module prestores
mdefault value exports to arithmetic element two; Arithmetic element two is according to R
mvalue calculates fuel tank intermediate fuel oil amount Vol and exports to wave filter; Wave filter carries out filtering to Vol value, removes short-term saltus step impact, and exports to instrument.
V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value, when there is any one or multiple of following situation, namely thinking unreasonable, otherwise namely thinking reasonable:
V-Δ V < V
1, Δ V for judging the rationality of V1,0 < Δ V≤0.5 volt;
V
1≤V
2；
V
2＝0。
R
mdiagnostic module judges the R that arithmetic element one calculates
mwhether value is reasonable, as 0≤R
m≤ R, R are the total resistance value of slide rheostat, and it is reasonable namely to think, otherwise namely think unreasonable.
The detection method of oil level in fuel tank, comprises step:
(1) buoys float, in fuel tank, on fuel oil surface, is followed the change of fuel capacity and changes the height in fuel tank, and float drives the slide plate on slide rheostat to change position;
(2), the slide rheostat one end of connecting with resistance one is to ECU output voltage V
1, the other end of slide rheostat is to ECU output voltage V
2;
(3), two analog to digital converters are respectively to V
1, V
2carry out analog to digital conversion and export to V
1and V
2sampling module;
(4), V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value, when there is any one or multiple of following situation, namely thinking unreasonable, otherwise namely thinking reasonable:
V-Δ V < V
1, Δ V is for judging V
1rationality, 0 < Δ V≤0.5 volt;
V1≤V
2；
V
2＝0；
Work as V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value is reasonable, then by V
1and V
2v1 and V in sampling module
2value exports to arithmetic element one, simultaneously by this V
1and V
2value is kept at V
1and V
2in backup module;
Work as V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2be worth unreasonable, then by V
1and V
2the last time stored in backup module is judged as rational V1 and V
2value exports to arithmetic element one;
(5), arithmetic element one calculates the variable resistance R of slide rheostat
m, wherein Rc is the resistance value of resistance one;
(6), R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue, as 0≤R
m≤ R, R are the total resistance value of slide rheostat, and it is reasonable namely to think, otherwise namely think unreasonable:
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue rationally, then by R that arithmetic element one calculates
mvalue exports to arithmetic element two, simultaneously by this R
mvalue is kept at R
min backup module;
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue unreasonable and duration is less than first threshold, then by R
mthe last time stored in backup module is judged as rational R
mvalue exports to arithmetic element two;
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue unreasonable and duration is more than or equal to first threshold, then by R
mthe R prestored in default module
mdefault value exports to arithmetic element two;
0 < first threshold≤600 second;
(7), arithmetic element two is tabled look-up and is obtained fuel tank intermediate fuel oil amount Vol and export to wave filter;
(8), wave filter carries out time filtering to Vol value, and exports to instrument;
(9) fuel capacity, in Instrument use Vol value display fuel tank.
In sum, the present invention can realize logistics vehicles fuel level in tank high-acruracy survey, and eliminates the interference of the contact resistance of slide rheostat.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the embodiment of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of the application.
Claims (5)
1. the oil level detecting device of a fuel tank, it is characterized in that, comprise: fuel tank, slide rheostat, resistance one, resistance two, ECU and instrument, described fuel tank intermediate fuel oil surface flotation has float, described float is connected with the slide plate on described slide rheostat, one end of described slide rheostat meets voltage V by the resistance one of series connection, and the slide plate on described slide rheostat is by resistance two ground connection in parallel, and one end that described slide rheostat is connected with resistance one is connected to ECU and output voltage V
1, the other end of described slide rheostat is connected to ECU and output voltage V
2, described Instrument connection is in the output terminal of described ECU.
2. the oil level detecting device of fuel tank according to claim 1, is characterized in that: described ECU comprises two analog to digital converters, V
1and V
2sampling module, V
1and V
2backup module, V
1and V
2diagnostic module, arithmetic element one, arithmetic element two, R
mbackup module, R
mdefault module, R
mdiagnostic module and wave filter, described two analog to digital converters are respectively to the voltage V of input
1, V
2carry out analog to digital conversion and export to V
1and V
2sampling module; Described V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2whether be worth reasonable; When rationally, by V
1and V
2v in sampling module
1and V
2value exports to arithmetic element one; When unreasonable, then by V
1and V
2the last time stored in backup module is judged as rational V
1and V
2value exports to arithmetic element one; Described arithmetic element one is according to V
1and V
2value calculates the variable resistance R of slide rheostat
m; Described R
mdiagnostic module judges the R that arithmetic element one calculates
mwhether be worth reasonable; When rationally, by the R that arithmetic element one calculates
mvalue exports to arithmetic element two; When unreasonable, by R
mthe last time stored in backup module is judged as rational R
mvalue or R
mthe R that default module prestores
mdefault value exports to arithmetic element two; Described arithmetic element two is according to R
mvalue calculates fuel tank intermediate fuel oil amount Vol and exports to wave filter; Described wave filter carries out filtering to described Vol value, removes short-term saltus step impact, and exports to instrument.
3. the oil level detecting device of fuel tank according to claim 2, is characterized in that: described V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value, when there is any one or multiple of following situation, namely thinking unreasonable, otherwise namely thinking reasonable:
V-Δ V < V
1, described Δ V for judging the rationality of V1,0 < Δ V≤0.5 volt;
V
1≤V
2；
V
2＝0。
4. the oil level detecting device of fuel tank according to claim 2, is characterized in that: described R
mdiagnostic module judges the R that arithmetic element one calculates
mwhether value is reasonable, as 0≤R
m≤ R, described R are the total resistance value of slide rheostat, and it is reasonable namely to think, otherwise namely think unreasonable.
5. the detection method of oil level in fuel tank, is characterized in that, comprise step:
(1) buoys float, in fuel tank, on fuel oil surface, is followed the change of fuel capacity and changes the height in fuel tank, and described float drives the slide plate on slide rheostat to change position;
(2), the slide rheostat one end of connecting with resistance one is to ECU output voltage V
1, the other end of slide rheostat is to ECU output voltage V
2;
(3), two analog to digital converters are respectively to V
1, V
2carry out analog to digital conversion and export to V
1and V
2sampling module;
(4), V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value, when there is any one or multiple of following situation, namely thinking unreasonable, otherwise namely thinking reasonable:
V-Δ V < V
1, described Δ V is for judging V
1rationality, 0 < Δ V≤0.5 volt;
V1≤V
2；
V
2＝0；
Work as V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2value is reasonable, then by V
1and V
2v1 and V in sampling module
2value exports to arithmetic element one, simultaneously by this V
1and V
2value is kept at V
1and V
2in backup module;
Work as V
1and V
2diagnostic module judges V
1and V
2v in sampling module
1and V
2be worth unreasonable, then by V
1and V
2the last time stored in backup module is judged as rational V1 and V
2value exports to arithmetic element one;
(5), arithmetic element one calculates the variable resistance R of slide rheostat
m, wherein Rc is the resistance value of resistance one;
(6), R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue, as 0≤R
m≤ R, described R are the total resistance value of slide rheostat, and it is reasonable namely to think, otherwise namely think unreasonable:
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue rationally, then by R that arithmetic element one calculates
mvalue exports to arithmetic element two, simultaneously by this R
mvalue is kept at R
min backup module;
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue unreasonable and duration is less than first threshold, then by R
mthe last time stored in backup module is judged as rational R
mvalue exports to arithmetic element two;
Work as R
mdiagnostic module judges the R that arithmetic element one calculates
mvalue unreasonable and duration is more than or equal to first threshold, then by R
mthe R prestored in default module
mdefault value exports to arithmetic element two;
0 < first threshold≤600 second;
(7), arithmetic element two is tabled look-up and is obtained fuel tank intermediate fuel oil amount Vol and export to wave filter;
(8), wave filter carries out time filtering to described Vol value, and exports to instrument;
(9) fuel capacity, in Instrument use Vol value display fuel tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510585803.2A CN105136250A (en) | 2015-09-15 | 2015-09-15 | Oil level detection device and detection method for fuel oil tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510585803.2A CN105136250A (en) | 2015-09-15 | 2015-09-15 | Oil level detection device and detection method for fuel oil tank |
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| CN105136250A true CN105136250A (en) | 2015-12-09 |
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ID=54721685
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|---|---|---|---|
| CN201510585803.2A Pending CN105136250A (en) | 2015-09-15 | 2015-09-15 | Oil level detection device and detection method for fuel oil tank |
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| CN105843267A (en) * | 2016-06-13 | 2016-08-10 | 国网山东省电力公司聊城供电公司 | Transformer oil level monitoring matching device and working method thereof |
| CN107782407A (en) * | 2017-09-11 | 2018-03-09 | 惠州市德赛西威汽车电子股份有限公司 | A kind of fuel-quantity transducer and oil mass detection circuit |
| CN110879092A (en) * | 2019-11-29 | 2020-03-13 | 安徽江淮汽车集团股份有限公司 | Liquid level monitoring circuit |
| CN110879092B (en) * | 2019-11-29 | 2020-12-01 | 安徽江淮汽车集团股份有限公司 | Liquid level monitoring circuit |
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Application publication date: 20151209 |