CN107884023A - A kind of fuel gauge test circuit, device and method - Google Patents
A kind of fuel gauge test circuit, device and method Download PDFInfo
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- CN107884023A CN107884023A CN201710914945.8A CN201710914945A CN107884023A CN 107884023 A CN107884023 A CN 107884023A CN 201710914945 A CN201710914945 A CN 201710914945A CN 107884023 A CN107884023 A CN 107884023A
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- fuel
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- fuel gauge
- sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a kind of fuel gauge test circuit, including switch K1, pull-up resistor R1 and fuel sensor Rx；A kind of test device of fuel gauge test circuit, including power consumption control module are also disclosed（2）, compensation AD value acquisition modules（3）, sensors A D value acquisition modules（4）And processor（1）；In addition, a kind of fuel oil method of testing of fuel gauge test device is also disclosed.The fuel gauge test circuit of the present invention, device and method, modulus (AD, Analog to Digital) is received using the acquisition precision of fuel sensor, improves the precision of fuel sensor data acquisition.
Description
Technical field
The present invention relates to automobile fuel gauge technical field, and in particular to a kind of fuel gauge test circuit, device and method.
Background technology
Fuel oil signal in vehicle complete vehicle only has instrument use, most absolutely when entire vehicle design is installed in order to save cost
It is that directly sensor signal is linked into instrument in the case of number, without car body controller (BCM, Body Control
Module Signal Pretreatment), instrument directly gather fuel sensor data and shown by inter-process.Although without
The scheme for crossing BCM processing saves cost, but can bring a series of problems：Reference voltage source is not used, reduces fuel oil sensing
The precision of device data acquisition；If improving acquisition precision, it is necessary to using high-precision power supply and reference voltage base, can carry again
The cost of high product.
The content of the invention
Present invention solves the technical problem that being to provide a kind of fuel gauge test circuit, device and method, sensed using fuel oil
The acquisition precision of device receives modulus (AD, Analog to Digital), improves the precision of fuel sensor data acquisition.
To achieve the above object, the present invention provides a kind of fuel gauge test circuit, including switch K1, pull-up resistor R1 and combustion
Oil sensor Rx, switch K1, pull-up resistor R1 and the fuel sensor Rx are connected in series, and the switch K1 connects power supply,
The fuel sensor Rx ground connection；The pull-up resistor R1 both ends are connected with offset voltage measurement circuit, and the offset voltage is surveyed
The resistance R3 and electric capacity C3 as filter action are connected with examination circuit；The fuel sensor Rx both ends are connected with sensor electricity
Measurement circuit is pressed, the resistance R2 and electric capacity C2 as filter action are connected with the sensor voltage measurement circuit.
Further, described switch K1 is relay.
In addition, the present invention also provides a kind of fuel gauge test device, including compensation AD values acquisition module, sensors A D values are adopted
Collect module and processor；The processor is connected with compensation AD values acquisition module and sensors A D value acquisition modules respectively；Institute
The collection that compensation AD values acquisition module is used for the AD values at pull-up resistor R1 both ends is stated, the sensors A D values acquisition module is used to fire
The collection of the AD values at oil sensor Rx both ends, the processor are used to control compensation AD values acquisition module and the collection of sensors A D values
Module works and computing compensation AD values acquisition module and the AD values of sensors A D values acquisition module collection.
Further, in addition to power consumption control module, the processor are connected with power consumption control module and control power consumption control
Molding block is worked, and the power consumption control module is powered for whole fuel gauge test device.
In addition, the present invention also provides a kind of fuel oil weight testing method using fuel gauge test device, comprise the following steps：
S1, open switch K1；
S2, sensors A D value acquisition modules（4）Gather the AD values AD2 at fuel sensor Rx both ends；
S3, compensation AD value acquisition modules（3）Gather the AD values AD3 at pull-up resistor R1 both ends；
S4, processor（1）According to Rx algorithmic formula computing Rx resistance.
Further, the algorithmic formula of the Rx is。
Further, formulaDerivation is as follows：
The voltage U2 calculation formula at fuel sensor Rx both ends are：（Formula one）, wherein Δ is AD points
The maximum numeric value of resolution, Uref are reference voltage；
The voltage U3 calculation formula at pull-up resistor R1 both ends are：（Formula two）, wherein Δ is a/d resolution
Maximum numeric value, Uref is reference voltage；
Following conversion relation be present in U2 and U3：（Formula three）；
Formula one, formula two are substituted into formula three and can obtain。
Further, there is delay in the step S2, and time delay is 15ms ~ 30ms.
Further, the time delay of the step S2 is 20ms.
Further, the cycle that described switch K1 is opened is 30s.
The beneficial effect that the present invention realizes mainly have it is following some：Offset voltage p-wire is set in fuel gauge test circuit
Road, fuel gauge test device are provided with compensation AD value acquisition modules, directly can test or be calculated pull-up resistor R1 both ends
Voltage calculate fuel sensor Rx resistances, without directly calculating fuel sensor Rx resistances using supply voltage calculating,
It is inaccurate that fuel sensor Rx resistances are calculated caused by power supply precision can be avoided low；Add filter circuit so that compensation AD
It is worth acquisition module, the voltage at the R1 both ends that sensors A D values acquisition module gathers, the test of fuel sensor Rx both end voltages or AD
Value test is more accurate, so as to which the remaining fuel of fuel tank value finally calculated is more accurate；Rx computing the resistor values formula carries out equivalent replacement, keeps away
Exempt to be influenceed by la tension de reference Uref est precision, and avoided the need for controller and carry out multiple multiplication and division computing, aggravated processor
Load, influence the speed of service；The fuel oil weight testing method of fuel gauge test device sets delay step, and delay causes pull-up resistor
R1, fuel sensor Rx are stable, so as to which test result is more accurate.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the intermediate fuel oil table test device of the embodiment of the present invention one；
Fig. 2 is the modular structure schematic diagram of the intermediate fuel oil table test device of the embodiment of the present invention two；
Fig. 3 is the intermediate fuel oil table method of testing schematic flow sheet of the embodiment of the present invention three；
Fig. 4 is a kind of remaining fuel of fuel tank and fuel sensor Rx resistance corresponding relation figures in the embodiment of the present invention three.
Description of reference numerals：1- processors, 2- power consumption control modules, 3- compensation AD value acquisition modules, 4- sensors A D values
Acquisition module.
Accompanying drawing being given for example only property explanation, it is impossible to be interpreted as the limitation to this patent；It is attached in order to more preferably illustrate the present embodiment
Scheme some parts to have omission, zoom in or out, do not represent the size of actual product；To those skilled in the art,
Some known features and its explanation may be omitted and will be understood by accompanying drawing；Same or analogous label corresponds to same or similar
Part；Term the being given for example only property explanation of position relationship described in accompanying drawing, it is impossible to be interpreted as the limitation to this patent.
Embodiment
For the ease of it will be appreciated by those skilled in the art that being carried out below in conjunction with accompanying drawing and embodiment to the present invention further
It is described in detail.
Embodiment one
Referring to Fig. 1, a kind of fuel gauge test circuit, including switch K1, pull-up resistor R1 and fuel sensor Rx, the switch
K1, pull-up resistor R1 and fuel sensor Rx are connected in series, and the switch K1 connects power supply, and the fuel sensor Rx connects
Ground, a loop is shaped as so as to switch K1, pull-up resistor R1 and fuel sensor Rx series connection.Switch K1 is a relay system
The switch of work.
Pull-up resistor R1 both ends are connected with offset voltage measurement circuit, after resistance R3 and electric capacity C3 series connection with pull-up resistor R1
Parallel connection, resistance R3 and electric capacity C3 composition filter circuit, by filter circuit gather pull-up resistor R1 both end voltages be on
The AD values AD3 at pull-up resistor R1 both ends is more accurate；The fuel sensor Rx both ends are connected with sensor voltage measurement circuit, resistance
It is in parallel with fuel sensor Rx after R2 and electric capacity C2 series connection, R2 and electric capacity C2 composition filter circuits, pass through.Filter circuit to adopt
The fuel sensor Rx both end voltages of collection are that the AD values AD2 at fuel sensor Rx both ends is more accurate.
During work, switch K1, pull-up resistor R1 and fuel sensor Rx composition series circuits, supply voltage are clipped in pull-up electricity
Hinder on R1 and fuel sensor Rx, pull-up resistor R1 can be tested by the offset voltage measurement circuit at pull-up resistor R1 both ends
The voltage U3 at both ends or the voltage for calculating pull-up resistor R1 both ends indirectly by testing the AD values AD3 at pull-up resistor R1 both ends
U3；Equally, fuel sensor Rx both ends can be tested by the sensor voltage measurement circuit at fuel sensor Rx both ends
The voltage U2 or voltage U2 for calculating fuel sensor Rx both ends indirectly by testing fuel sensor Rx AD values AD2.
Because known to pull-up resistor R1 resistance, and fuel sensor Rx and pull-up resistor R1 series connection is in circuit, so
Fuel sensor can be calculated by the voltage U2 at the fuel sensor Rx both ends measured, the voltage U3 at pull-up resistor R1 both ends
Rx resistance size, so as to be drawn by the oil mass corresponding relation in fuel sensor Rx size and automotive oil tank in fuel tank
Oil mass value is simultaneously shown in the instrument of vehicle.
Because the voltage at pull-up resistor R1 both ends is directly tested or be calculated to the present embodiment to calculate fuel sensor Rx
Resistance, do not calculated using supply voltage to calculate fuel sensor Rx resistances directly, it is possible to avoid power supply precision is low from leading
The calculating fuel sensor Rx resistances of cause are inaccurate；Filter circuit is added in other the present embodiment so that the voltage at R1 both ends,
Fuel sensor Rx both end voltages are tested or the test of AD values is more accurate.
Embodiment two
Referring to Fig. 2, a kind of fuel gauge test device, including power consumption control module 2, compensation AD values acquisition module 3, sensors A D
Be worth acquisition module 4 and processor 1, processor 1 respectively with power consumption control module 2, compensation AD values acquisition module 3 and sensors A D values
Acquisition module 4 is connected.
During work, the processor 1 is used to control compensation AD values acquisition module 3 and sensors A D values acquisition module 4 to work.
Power consumption control module 2 is used for the power supply of whole fuel gauge test device；Compensate AD values acquisition module 3 and pull-up resistor R1 both ends
Offset voltage measurement circuit connects, and gathers the AD values AD3 at pull-up resistor R1 both ends；The sensors A D values acquisition module 4 with
The sensor voltage measurement circuit connection at fuel sensor Rx both ends, and gather the AD values AD2 at fuel sensor Rx both ends；Processing
The AD2 that the AD3 and sensors A D values acquisition module 4 that device 1 gathers computing compensation AD values acquisition module 3 are gathered, obtains Rx resistance
Value, so as to draw the oil mass value in fuel tank by the oil mass corresponding relation in fuel sensor Rx size and automotive oil tank and show
Show in the instrument of vehicle.
Embodiment three
Referring to Fig. 3, a kind of fuel oil weight testing method of fuel gauge test device, including step in detail below：
S1, switch K1 is opened, the cycle of unlatching is 30s, i.e., switch K1 is opened once per 30s, and switch K1 completes follow-up after opening
Step, closed until subsequent step is fully completed switch K1；
S2, sensors A D values acquisition module 4 gather the AD value AD2 at fuel sensor Rx both ends, and the step, which exists, to be postponed, during delay
Between be 15ms ~ 30ms, preferably 20 ms, it is stable by postponing pull-up resistor R1, fuel sensor Rx, tied so as to test
Fruit is more accurate；
S3, compensation AD values acquisition module 3 gather the AD values AD3 at pull-up resistor R1 both ends；
S4, processor 1 are according to fuel sensor Rx algorithmic formulaComputing Rx resistance.
Fuel sensor Rx algorithmic formulaDerivation it is as follows：
The voltage U2 calculation formula at fuel sensor Rx both ends are：（Formula one）, wherein Δ is AD points
The maximum numeric value of resolution, UrefFor reference voltage；
The voltage U3 calculation formula at pull-up resistor R1 both ends are：（Formula two）, wherein Δ is a/d resolution
Maximum numeric value, UrefFor reference voltage；
Following conversion relation be present in U2 and U3：（Formula three）；
Formula one, formula two are substituted into formula three and can obtain
Simplifying the calculation formula of resistance for obtaining fuel sensor Rx is：。
Fuel sensor Rx resistance is obtained by above-mentioned steps, so as to pass through fuel sensor Rx size and automobile oil
Oil mass corresponding relation in case draws the oil mass value in fuel tank and is shown in the instrument of vehicle, for example, passing through Fig. 4 and table 1
Remaining fuel of fuel tank and fuel sensor Rx resistance corresponding relations, can obtain remaining fuel of fuel tank.
Table 1, a kind of remaining fuel of fuel tank and fuel sensor Rx resistance mapping tables
| Rx resistances/Ω | 25 | 40 | 65 | 90 | 117 | 230 |
| Fuel Oil Remaining/L | 50 | 40 | 30 | 20 | 10 | 3 |
It is the wherein specific implementation of the present invention above, its description is more specific and detailed, but can not therefore be interpreted as
Limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, this hair is not being departed from
On the premise of bright design, various modifications and improvements can be made, these obvious alternative forms belong to the present invention's
Protection domain.
Claims (10)
- A kind of 1. fuel gauge test circuit, it is characterised in that：It is described including switch K1, pull-up resistor R1 and fuel sensor Rx Switch K1, pull-up resistor R1 and fuel sensor Rx are connected in series, and the switch K1 meets power supply, the fuel sensor Rx Ground connection；The pull-up resistor R1 both ends are connected with offset voltage measurement circuit, and work is connected with the offset voltage measurement circuit For the resistance R3 and electric capacity C3 of filter action；The fuel sensor Rx both ends are connected with sensor voltage measurement circuit, described The resistance R2 and electric capacity C2 as filter action are connected with sensor voltage measurement circuit.
- 2. fuel gauge test circuit according to claim 1, it is characterised in that：Described switch K1 is relay.
- A kind of 3. test device for the fuel gauge test circuit of claim 1 or 2, it is characterised in that：Adopted including compensation AD values Collect module（3）, sensors A D value acquisition modules（4）And processor（1）；The processor（1）Respectively mould is gathered with compensation AD values Block（3）With sensors A D value acquisition modules（4）It is connected；The compensation AD value acquisition modules（3）For pull-up resistor R1 both ends AD values collection, the sensors A D value acquisition modules（4）For the collection of the AD values at fuel sensor Rx both ends, the place Manage device（1）AD value acquisition modules are compensated for controlling（3）With sensors A D value acquisition modules（4）Work and computing compensates AD values Acquisition module（3）With sensors A D value acquisition modules（4）The AD values of collection.
- 4. fuel gauge test device according to claim 1, it is characterised in that：Also include power consumption control module（2）, it is described Processor（1）With power consumption control module（2）Connect and control power consumption control module（2）Work, the power consumption control module（2）With Powered in whole fuel gauge test device.
- 5. the fuel oil method of testing of the fuel gauge test device according to claim 3 or 4, it is characterised in that including following Step：S1, open switch K1；S2, sensors A D value acquisition modules（4）Gather the AD values AD2 at fuel sensor Rx both ends；S3, compensation AD value acquisition modules（3）Gather the AD values AD3 at pull-up resistor R1 both ends；S4, processor（1）According to Rx algorithmic formula computing Rx resistance.
- 6. fuel gauge method of testing according to claim 5, it is characterised in that：The algorithmic formula of the Rx is。
- 7. fuel gauge method of testing according to claim 6, it is characterised in that：Formula Derivation is as follows：The voltage U2 calculation formula at fuel sensor Rx both ends are：（Formula one）, wherein Δ It is the maximum numeric value of a/d resolution, UrefFor reference voltage；The voltage U3 calculation formula at pull-up resistor R1 both ends are：（Formula two）, wherein Δ is The maximum numeric value of a/d resolution, UrefFor reference voltage；Following conversion relation be present in U2 and U3：（Formula three）；Formula one, formula two are substituted into formula three and can obtain。
- 8. fuel gauge method of testing according to claim 5, it is characterised in that：There is delay in the step S2, during delay Between be 15ms ~ 30ms.
- 9. fuel gauge method of testing according to claim 8, it is characterised in that：The time delay of the step S2 is 20ms。
- 10. fuel gauge method of testing according to claim 5, it is characterised in that：The cycle that described switch K1 is opened is 30s。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710914945.8A CN107884023B (en) | 2017-09-30 | 2017-09-30 | Fuel gauge test circuit, device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710914945.8A CN107884023B (en) | 2017-09-30 | 2017-09-30 | Fuel gauge test circuit, device and method |
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| Publication Number | Publication Date |
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| CN107884023A true CN107884023A (en) | 2018-04-06 |
| CN107884023B CN107884023B (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710914945.8A Active CN107884023B (en) | 2017-09-30 | 2017-09-30 | Fuel gauge test circuit, device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540254A (en) * | 2018-10-10 | 2019-03-29 | 惠州市德赛西威汽车电子股份有限公司 | A kind of fuel oil for vehicles overmeasure computation method based on voltage ratio |
| CN113124953A (en) * | 2020-01-16 | 2021-07-16 | 广州汽车集团股份有限公司 | Metering method and device for displaying oil amount in automobile fuel gauge and related equipment |
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| CN106092358A (en) * | 2016-06-13 | 2016-11-09 | 潍柴动力股份有限公司 | A kind for the treatment of method and apparatus of resistance sensor signal |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2646907A1 (en) * | 1989-05-09 | 1990-11-16 | Jaeger | Device for measuring the level and/or volume of liquid in a tank |
| CN201060548Y (en) * | 2007-06-28 | 2008-05-14 | 上海德科电子仪表有限公司 | Improved circuit for improving A/D sampling precision of vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540254A (en) * | 2018-10-10 | 2019-03-29 | 惠州市德赛西威汽车电子股份有限公司 | A kind of fuel oil for vehicles overmeasure computation method based on voltage ratio |
| CN113124953A (en) * | 2020-01-16 | 2021-07-16 | 广州汽车集团股份有限公司 | Metering method and device for displaying oil amount in automobile fuel gauge and related equipment |
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| Publication number | Publication date |
|---|---|
| CN107884023B (en) | 2020-10-16 |
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