CN203191006U - Oil consumption detection device with temperature compensation and signal filter functions - Google Patents
Oil consumption detection device with temperature compensation and signal filter functions Download PDFInfo
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- CN203191006U CN203191006U CN 201320175567 CN201320175567U CN203191006U CN 203191006 U CN203191006 U CN 203191006U CN 201320175567 CN201320175567 CN 201320175567 CN 201320175567 U CN201320175567 U CN 201320175567U CN 203191006 U CN203191006 U CN 203191006U
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- temperature compensation
- oil consumption
- microcontroller
- signal filter
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Abstract
The utility model discloses an oil consumption detection device with temperature compensation and signal filter functions, which comprises a flow rate sensor which is arranged on a vehicle engine oil circuit, wherein the flow rate sensor is connected with a microcontroller through a signal filter circuit. The oil consumption detection device with temperature compensation and signal filter functions further comprises a light emitting diode (LED) display which is arranged in a vehicle cab instrument panel, wherein the LED display is connected with the microcontroller, and the microcontroller is further respectively connected with a power supply circuit, a temperature detection circuit and a calibration interface circuit. Compared with the prior art, the oil consumption detection device with temperature compensation and signal filter functions has the advantages of accurate detection, strong reliability, simple circuit and easy achieving and the like.
Description
Technical field
The utility model relates to the oil consumption pick-up unit in the vehicle fuel consume supervisory system, is specifically related to a kind of high-precision low cost oil consumption pick-up unit with temperature compensation, signal filtering function.
Background technology
Vehicle fuel pick-up unit in using at present mostly is fuel tank and detects, precision is relatively poor, and there is not temperature compensation function, it is inaccurate to cause the actual fuel consume of automobile to detect, product export does not have the transducer calibration adjusting function more afterwards and this error can be increasing after the pick-up unit hardware aging, such pick-up unit makes the user can't make judgement accurately to the fuel consume of reality, influences user's use.
The utility model content
The purpose of this utility model is to provide a kind of oil consumption pick-up unit with temperature compensation, signal filtering and transducer calibration function.
For achieving the above object, the utility model has adopted following technical scheme:
A kind of oil consumption pick-up unit with temperature compensation and signal filtering function comprises the flow sensor that is installed on the motor car engine oil circuit, and flow sensor is connected with a microcontroller by signal filter circuit; This device also comprises the light-emitting diode display that is arranged in the automobile cab panel board, and this light-emitting diode display is connected with described microcontroller; On microcontroller, also be connected with power circuit, temperature sensing circuit and demarcation interface circuit respectively.
Described microcontroller adopts MC9S12XS128 type single-chip microcomputer.
Described flow sensor adopts PDFM8RC60135/RP0.0125-N type rotary-piston type flow sensor.
Described signal filter circuit comprises anti-phase Schmidt trigger, and described anti-phase Schmidt trigger adopts HEF40106 type Schmidt trigger.
Oil consumption pick-up unit described in the utility model utilizes flow sensor that the fuel flow of the motor car engine of flowing through is directly detected, detected signal is passed to single-chip microcomputer through behind the signal filter circuit, while is the fuel oil temperature that the temperature sensing circuit of core detects the flow sensor of flowing through with the thermistor, also sends single-chip microcomputer to.Single-chip microcomputer carries out respective handling at the flow sensor signal of receiving, and utilizes detected temperature signal that fuel flow is carried out temperature compensation, finally draws the actual fuel consumption of high-precision engine.The utlity model has following technological merit:
1, detects the sensor that flow uses and directly be connected on the oil circuit of engine, make and detect accurately good reliability.
2, circuit EMC handles, and is anti-interference strong, adapts to various complex conditions, satisfies the automotive grade application standard.
3, detected signal has been carried out temperature compensation, improved accuracy of detection and filled up the correlation technique blank simultaneously.
4, the signal of flow sensor has carried out filtering and disappears and tremble processing, has further strengthened accuracy of detection and has improved system's anti-jamming capacity simultaneously.
5, the automotive grade embedded controller is used in simple, the realization easily of circuit, and system is reliable stable.
6, have the transducer calibration function, realize the high-precision low cost measurement
Description of drawings
Fig. 1 is annexation synoptic diagram of the present utility model;
Fig. 2 is the circuit diagram of temperature sensing circuit in the utility model;
Fig. 3 is the circuit diagram of power circuit in the utility model;
Fig. 4 is the circuit diagram of demarcating interface circuit in the utility model;
Fig. 5 is the workflow diagram of embodiment 1;
Below in conjunction with accompanying drawing the utility model is described further.
Embodiment
Defer to technique scheme, as shown in Figure 1, a kind of oil consumption pick-up unit with temperature compensation and signal filtering function comprises the flow sensor that is installed on the motor car engine oil circuit, and flow sensor is connected with a microcontroller by signal filter circuit; This device also comprises the light-emitting diode display that is arranged in the automobile cab panel board, and this light-emitting diode display is connected with described microcontroller; On microcontroller, also be connected with power circuit, temperature sensing circuit and demarcation interface circuit respectively.
Flow sensor is installed on the oil circuit of engine, different types of engine has different mounting meanss, diesel motor need be installed two, one on the oil circuit of inflow engine, another is flowing out on the oil circuit of engine, and petrol engine only need be installed the output terminal of a flow sensor and is connected with signal filter circuit.The test side of temperature sensing circuit closely is connected with flow sensor, and output terminal is connected with the AD conversion mouth of microcontroller, and the output terminal of signal filter circuit is connected with the input port of microcontroller.
Described power circuit is made up of overcurrent-overvoltage insurance, low-frequency filter circuit and high-frequency filter circuit, as shown in Figure 3.The 24V power supply connects fuse through switch, plays overcurrent protection; Insert first π type low frequency filtering network of R1, L1, C1 formation again, wherein this pin network has also connect a D1 stabilivolt and has played overvoltage protection; Termination C2, L2, C3 constitute a High frequency filter network behind the low frequency filtering network, but the filtering peak current plays a very good protection to rear end equipment.This filter power supply has improved anti-interference and the Electromagnetic Compatibility of this pick-up unit.
Corresponding with diesel motor and petrol engine, described temperature sensing circuit is divided into double-current quantity sensor temperature sensing circuit and single current quantity sensor temperature sensing circuit, the difference of quantity is installed according to flow sensor divides.As shown in Figure 2, Fig. 2 provide for the circuit diagram of double-current quantity sensor temperature sensing circuit.Double fluid quantity sensor temperature sensing circuit comprises that two NTC temperature-sensitives adopt resistance R 3 and R4, divider resistance R5 and divider resistance R6 and filter capacitor C1 and filter capacitor C2, one termination power VCC of a NTC resistance, an AD conversion mouth of divider resistance of another termination and embedded controller, divider resistance other end ground connection GND, and a last filter capacitor in parallel is distinguished at each divider resistance two ends again.If system is single current quantity sensor temperature sensing circuit, then only need a NTC thermistor R3, divider resistance R5 and filter capacitor C1, connected mode is the same with double-current quantity sensor temperature sensing circuit.
Described signal filter circuit also is divided into double-current quantity sensor signal filter circuit and single current quantity sensor signal filter circuit, also divides according to the difference of flow sensor installation quantity.Double fluid quantity sensor signal filter circuit comprises two anti-phase Schmidt triggers, the output terminal of a flow sensor of input termination of a trigger, an input port of output termination microcontroller.If system is single current quantity sensor signal filter circuit, then only need an anti-phase Schmidt trigger, connected mode is the same with double-current quantity sensor temperature sensing circuit.
This installs described calibrating function and realizes by demarcating interface circuit, as shown in Figure 4.Whether this demarcation interface can detection of dynamic have pick-up unit to insert, when system detects the caliberating device access, plug presses the touch-switch of interface and gives processing signals of microprocessor, microprocessor changes calibrating procedure over to after receiving signal automatically, need carry out timing signal to this device, as long as this device is docked with caliberating device, flow sensor is connected with the high-precision sensor of caliberating device, operational system is carried out from normal moveout correction this pick-up unit by revising correction parameter by caliberating device.Demarcation can be undertaken by life cycle, demarcates cycle length and can decide by demand, has effectively prevented because the detection error that the sensor hardware aging is brought.This device can improve precision greatly through after demarcating, and a plurality of pick-up unit only needs a caliberating device get final product, has reduced cost when realizing high-acruracy survey again.
Principle of work of the present utility model:
The utility model utilizes flow sensor that the fuel flow of the motor car engine of flowing through is directly detected, detected signal is passed to microprocessor through behind the signal filter circuit, detect the fuel oil temperature of the flow sensor of flowing through simultaneously with temperature sensing circuit, also send microprocessor to.Microprocessor carries out respective handling at the flow sensor signal of receiving, and utilize detected temperature signal that fuel flow is carried out temperature compensation, finally draw the actual fuel consumption of high-precision engine, be presented at by light-emitting diode display in the panel board of pilothouse.
Below provide specific embodiment of the utility model.
Embodiment 1:
Present embodiment is example to detect the diesel motor oil consumption, be to be flow sensor SENSOR1 and the SENSOR2 of PDFM8RC60135/RP0.0125-N by model, model is the anti-phase Schmidt trigger U2A of HEF40106, model is NTC thermistor R3 and the R4(5K of NTC-SE40B503-5K), divider resistance R5 and R6(1K Ω), filter capacitor C1 and C2(0.001 μ F), pull-up resistor R1 and R2(1K), model is the oil consumption pick-up unit with temperature compensation and signal filtering function that 16 single-chip microcomputer U1 of MC9S12XS128 combine, and its circuit such as Fig. 2 are to shown in Figure 4.
Flow sensor SENSOR1 and SENSOR2 are directly installed in the oil-feed and fuel-displaced oil circuit of diesel motor, pull-up resistor R1 and R2 provide driving power for it, anti-phase Schmidt trigger U2A is filtering circuit, and NTC thermistor R3 and R4 and divider resistance R5, R6 and filter capacitor C1 and C2 form temperature sensing circuit.
Power supply VCC is 5V, when not having fuel oil to flow through engine or engine not carry out fuel consume, flow sensor SENSOR1 and SENSOR2 do not rotate, the sensor internal reed switch circuit disconnects over the ground, because pull-up resistor R1 and R2 power supply make the input end of anti-phase Schmidt trigger U2A be high level always, the input end of single-chip microcomputer keeps low level, is not accumulated to pulse signal, measure this moment fuel consumption be zero.
When engine is started working fuel consumption, SENSOR2 on SENSOR1 on the oil-feed oil circuit and the fuel-displaced oil circuit is respectively owing to flowing of oil circuit intermediate fuel oil rotates, when inner turbine whenever rotates a circle, the inside reed switch circuit of flow sensor just links to each other once with GND, make and produce a low level pulse on the corresponding input end of anti-phase Schmidt trigger U2A, anti-phase Schmidt trigger carries out filtering to this pulse signal and disappears and tremble anti-phase high level pulse of back output and give flush bonding processor U1, and simultaneously, NTC thermistor R3 and R4 are also respectively owing to the temperature of flow sensor SENSOR1 and SENSOR2 intermediate fuel oil produces the resistance value of response, and also sending flush bonding processor U1 to because the dividing potential drop effect of resistance R 5 and R6 makes it export a voltage signal respectively at the output terminals A D0 of temperature detecting module and AD1 place, capacitor C 1 and C2 then play the effect of a filtering to the voltage signal on R5 and the R6.
Single-chip microcomputer U1 at first carries out system initialization after device powers on, make himself energy operate as normal, carry out timer then and interrupt initialization, initialization is that 1ms is that the sample frequency of the pulse passed back of processor flow sensor is 1000hz break period, single-chip microcomputer enters wait and judges whether timing is 10s after the timer initialization is finished, wait for if do not expire 10s then continue, the concrete stand-by period can adopt the difference of frequency to arrange to fuel consumption according to the user, if full 10s of stand-by period, then the single-chip microcomputer two-way umber of pulse that will use in 1ms regularly interrupts changes with Sum1 and Sum2, be the flow sensor of PDFM8RC60135/RP0.0125-N for model, whenever the fuel oil that flows through 5ml will produce a pulse signal, so single-chip microcomputer multiply by 5ml respectively with Sum1 and Sum2 and then obtains fuel flow Flow1 and Flow2 in the 10s the two-way umber of pulse, read again and it carried out the scalar conversion after the value of AD0 and AD1 and obtain temperature value temp1 and temp2, and utilize the relation of temperature and fuel density:
P
t＝P
20-a(t-20)
(in the formula, P
t: the density of diesel oil when temperature is t, a: correction factor, t: Celsius temperature; )
And calibration coefficient calculates accurate fuel flow value FLOW1 and FLOW2, oil-feed oil circuit flow FLOW1 deducted fuel-displaced oil circuit flow FLOW2 at last again and draws in the 10s engine fuel consumption quantity E_FLOW accurately.What single-chip microcomputer U1 did not stop like this moves in circles program like this, just can detect the fuel consumption in the whole engine working process, and fuel consume information is exported by light-emitting diode display, and program flow diagram as shown in Figure 5.
Claims (4)
1. the oil consumption pick-up unit with temperature compensation and signal filtering function is characterized in that, comprises the flow sensor that is installed on the motor car engine oil circuit, and flow sensor is connected with a microcontroller by signal filter circuit; This device also comprises the light-emitting diode display that is arranged in the automobile cab panel board, and this light-emitting diode display is connected with described microcontroller; On microcontroller, also be connected with power circuit, temperature sensing circuit and demarcation interface circuit respectively.
2. the oil consumption pick-up unit with temperature compensation and signal filtering function as claimed in claim 1 is characterized in that, described microcontroller adopts MC9S12XS128 type single-chip microcomputer.
3. the oil consumption pick-up unit with temperature compensation and signal filtering function as claimed in claim 1 is characterized in that, described flow sensor adopts PDFM8RC60135/RP0.0125-N type rotary-piston type flow sensor.
4. the oil consumption pick-up unit with temperature compensation and signal filtering function as claimed in claim 1, it is characterized in that, described signal filter circuit comprises anti-phase Schmidt trigger, and described anti-phase Schmidt trigger adopts HEF40106 type Schmidt trigger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320175567 CN203191006U (en) | 2013-04-09 | 2013-04-09 | Oil consumption detection device with temperature compensation and signal filter functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320175567 CN203191006U (en) | 2013-04-09 | 2013-04-09 | Oil consumption detection device with temperature compensation and signal filter functions |
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| Publication Number | Publication Date |
|---|---|
| CN203191006U true CN203191006U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320175567 Expired - Fee Related CN203191006U (en) | 2013-04-09 | 2013-04-09 | Oil consumption detection device with temperature compensation and signal filter functions |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457875A (en) * | 2014-12-15 | 2015-03-25 | 重庆和平自动化工程股份有限公司 | Open gravity fuel consumption detector |
| CN106513615A (en) * | 2016-12-07 | 2017-03-22 | 重庆市合川区银窝铸造厂 | Temperature detecting circuit applied to low-temperature casting system |
| CN111340980A (en) * | 2018-12-18 | 2020-06-26 | 英飞凌科技股份有限公司 | Authentication system and method of generating a multi-component fingerprint for a vehicle |
-
2013
- 2013-04-09 CN CN 201320175567 patent/CN203191006U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457875A (en) * | 2014-12-15 | 2015-03-25 | 重庆和平自动化工程股份有限公司 | Open gravity fuel consumption detector |
| CN106513615A (en) * | 2016-12-07 | 2017-03-22 | 重庆市合川区银窝铸造厂 | Temperature detecting circuit applied to low-temperature casting system |
| CN111340980A (en) * | 2018-12-18 | 2020-06-26 | 英飞凌科技股份有限公司 | Authentication system and method of generating a multi-component fingerprint for a vehicle |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20140409 |