CN104019833B - Engine oil needle position sensor detection circuit - Google Patents
Engine oil needle position sensor detection circuit Download PDFInfo
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Abstract
A kind of engine oil needle position sensor detection circuit that the present invention proposes, the square wave signal that square wave turns sinewave circuit in the future self-controller CPU is converted to the same frequency sine-wave signal of two-way standard, outputs to oil-pin position excitation output unit respectively by two-way power stage amplifier after reverse operational amplifier amplifies; The sine wave that the sinusoidal wave stage of amplification of excitation exports is shaped as the same frequency ground connection square wave signal of three road sign standards through comparer and shaping circuit, deliver to the sine wave that oil-pin position encourages, sinusoidal SIN, cosine COS detect passage and turn half-wave unit group, the sinusoidal wave lower half upset exported by sinusoidal wave stage of amplification is frequency multiplication half-wave voltage signal, by three tunnels detection passages half-wave turns volts DS unit group filtering, shaping is transformed to level and smooth volts DS; Engine electronic control system device CPU, according to the trigonometrical function relation of AD conversion magnitude of voltage, calculates oil-pin position size, judges whether the excitation of oil outer needle position sensor, sine, cosine three winding impedance and phase place mate.
Description
Technical field
The present invention relates to and a kind of it is applied to the driving of Angle Position sensor and the detection circuit of angle signal parsing aspect, be especially applicable to the detection circuit of engine oil needle position sensor.
Background technology
In aeroengine control, fuel metering device generally adopts torque motor or stepper-motor to change oil-pin position, thus controls fuel oil flow. In AEROENGINE DIGITAL CONTROL SYSTEM, it is mainly used in the line/angular travels such as throttle lever position, oil-pin position, stator position, nozzle exit area are carried out accurate Measurement & Control. The driving of Angle Position sensor common at present and detection technique adopt the application specific integrated circuits such as AD2S80 to realize, and these unicircuit are along with the raising of output accuracy, it is necessary to resolve the time more long, and the real-time that angle is resolved is more poor. Vibrate bigger during engine operation, temperature is higher, disturb stronger, for engine fuel flow detection and control, engine electronic control system device is needed to provide fuel oil flow information promptly and accurately, being convenient to and control fuel flow amount, electronic regulator could be efficient in time to the control of engine, and the work of engine could be flexible. The detection of the obviously conventional at present Angle Position sensor detection not competent engine oil-pin position of application specific integrated circuit.
Summary of the invention
It is an object of the invention to have problems for prior art, thering is provided a kind of adopts device less, the 2500HZ square wave of in the future self-controller CPU can be converted to the engine oil needle position sensor detection circuit that the same frequency sine-wave of standard exports as excitation, this detection circuit error is little, the very fast real-time height of detection speed, working stability is reliable.
The above-mentioned purpose of the present invention can be reached by following measure, a kind of engine oil needle position sensor detection circuit, comprise square wave and turn sinewave circuit, circuit is amplified in oil-pin position excitation, oil-pin position excitation output unit, sine wave turns square wave unit, sine wave turns half-wave unit and half-wave turns volts DS unit, it is characterized in that: the square wave signal that square wave turns sinewave circuit in the future self-controller CPU is converted to the same frequency sine-wave signal of two-way standard, oil-pin position excitation output unit is outputted to respectively by two-way power stage amplifier after reverse operational amplifier amplifies, the sine wave that the sinusoidal wave stage of amplification of excitation exports is shaped as the same frequency ground connection square wave signal of three road sign standards through comparer and shaping circuit, the sine wave that oil-pin position excitation is delivered to ground connection square wave signal frequently in three tunnels, sinusoidal SIN, cosine COS detect passage turns half-wave unit group, the sinusoidal wave lower half upset exported by sinusoidal wave stage of amplification is frequency multiplication half-wave voltage signal, frequency multiplication half-wave voltage signal turns volts DS unit group filtering by the half-wave on three tunnel detection passages, shaping is transformed to level and smooth volts DS, and delivers to a/d converter and be converted to magnitude of voltage, engine electronic control system device CPU is according to the trigonometrical function relation of AD conversion magnitude of voltage, calculate oil-pin position size, judge whether the excitation of oil outer needle position sensor, sinusoidal SIN, cosine COS tri-winding impedance and phase place mate, whether there is the situation of short circuit, open circuit.
The present invention has following useful effect compared to prior art.
The present invention's excitation, sinusoidal SIN, cosine COS tri-tunnel detection passage sine wave amplify unit and the undesired signal that sensor input and output cable is introduced are had sorption; the equal current limiting of sensor input and output signal, limited amplitude protection; making oil-pin position sensor external short circuit and point peak pulse that circuit can not be caused to damage, the high pressure of outside introducing and undesired signal can not cause oil-pin position process to damage.
The 2500HZ square wave that 2500HZ square wave provided by the invention turns sinewave circuit in the future self-controller CPU is converted to the same frequency sine-wave of suitable standard, ties novel, and the device of employing is less, and working stability is reliable, and this sine wave is very level and smooth through actual observation.
The present invention is for improving oil-pin position sensor detected result tolerance range, circuit at different levels all adopts high-performance amplifier, the resistance that sinusoidal wave stage of amplification, sine wave turn relevant with waveforms amplitude magnification in half-wave unit is all that precision is less than 0.1%, and temperature is waftd and is less than 10ppm/K. The magnitude of voltage ripple of the detection passage acquisition turning volts DS by excitation, sinusoidal SIN, cosine COS tri-identical sine waves is less, and the oil-pin position obtained after AD conversion is all less than 0.05 �� through measurement error.
The 2500HZ that oil-pin position of the present invention excitation exports is sinusoidal wave, and the current limliting resistance that have passed through tens ohm from amplifier out is just to sensor excitation end, it is possible to avoid external sense device excitation part Damage by Short Circuit circuit.
The present invention's excitation, sinusoidal SIN, cosine COS tri-sampling channels, due to adopt in a large number high performance operational amplifier and high precision low temperature waft resistance, optimization amplification and conversion circuit, there is the advantages such as working stability is reliable, acquisition precision height, immunity from interference are strong, similar process circuit can be widely used in through local parameter adjustment.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Fig. 1 inventive engine oil-pin position detection circuit block diagram.
Fig. 2 is that in Fig. 1,2500HZ square wave turns sinewave circuit schematic diagram.
Fig. 3 is engine oil needle position signal process circuit principle schematic.
Embodiment
Consult Fig. 1. Engine oil needle position sensor detection circuit comprises that 2500HZ square wave turns sinewave circuit, circuit is amplified in oil-pin position excitation, oil-pin position excitation output unit, half-wave control unit, and oil-pin position excitation, sinusoidal SIN, the sinusoidal wave amplification circuit of cosine COS tri-paths, sine wave turn half-wave unit, half-wave turns volts DS unit. The 2500HZ square wave of the generation of engine electronic control system device CPU is delivered to 2500HZ square wave and is turned in sinewave circuit, and square wave turns the 2500HZ that the 2500HZ square wave signal that engine controller CPU exports by sinewave circuit is converted to two-way standard and delivers to oil-pin position sensor excitation end with frequency sine-wave signal. Sinusoidal SIN, cosine COS signal that oil-pin position sensor exports enter oil-pin position detection circuit, form oil-pin position actuation signal, sinusoidal SIN, cosine COS signal three tunnel acquisition channel roughly the same; The sine wave that the sinusoidal wave stage of amplification of excitation exports is shaped as the same frequency ground connection square wave signal of three road sign standards through comparer and shaping circuit, the sine wave that oil-pin position excitation is delivered to ground connection square wave signal frequently in three tunnels, sinusoidal SIN, cosine COS detect passage turns half-wave unit group, the sinusoidal wave lower half upset that sinusoidal wave stage of amplification is exported, processing signals is converted to frequency multiplication half-wave voltage signal, and frequency multiplication half-wave voltage signal turns volts DS unit group filtering by the half-wave on three tunnel detection passages, shaping is transformed to level and smooth volts DS. Such oil-pin position sensor three tunnel input and output signal amplifies through amplitude, sine wave turns half-wave, half-wave turns direct current process, obtain the voltage signal corresponding with input signal amplitude and be converted to magnitude of voltage to a/d converter, engine electronic control system device CPU is according to the trigonometrical function relation of AD conversion magnitude of voltage, calculate oil-pin position size, judge whether the excitation of oil outer needle position sensor, sinusoidal SIN, cosine COS tri-winding impedance and phase place mate, whether there is the situation of short circuit, open circuit. Thus obtain engine oil amount in real time, further engine can be carried out real-time oil quantity control according to this fuel delivery engine electronic control system device.
Consult Fig. 2, turn in sinewave circuit at 2500HZ square wave, the 2500HZ that the 2500HZ square wave that controller CPU is exported by the conversion circuit that operational amplifier U3A, U2A, U1A and U1B are formed is converted to standard is sinusoidal wave, wherein operational amplifier U3A is by sinusoidal wave for square wave conversion, operational amplifier U2A carries out amplitude amplification, and operational amplifier U1A, U1B form the feedback loop changing U3A input signal amplitude.In order to avoid output amplitude too high, the signal exported from power amplifier U2B forms limiting circuit suppression output voltage amplitude by twin diode Q2; The signal exported from power amplifier U4A suppresses output voltage amplitude by twin diode Q3 limiting circuit.
The sinusoidal wave frequency of 2500HZ is amplified circuit by power amplifier U2B and is carried out power magnification, the just end of Angle Position sensor excitation is outputted to by resistance R16 current limliting, external sense device excitation terminal shortcircuit can not cause U2B to damage, the reverse feedback that integral capacity C2 is formed can guarantee that circuit working ripple is less, as far as possible less by external interference. Feedback resistance R7 encourages output plus terminal acquired signal to input negative terminal to U2B from oil-pin position, it is possible to guaranteeing that output amplitude is stablized, restricted flow resistance R16 does not affect.
It is reverse that 2500HZ sine wave amplifies circuit by operational amplifier U3B, and U3B input/output terminal cross-over connection has the resistance R11 determining magnification and the integral capacity C10 improving ripple; The sinusoidal wave frequency of 2500HZ that operational amplifier U3B amplifies circuit output carries out power magnification by operational amplifier U4A, is outputted to the negative terminal of pin position transducer excitation by current limliting resistance R17, and external sense device excitation terminal shortcircuit can not cause U4A to damage. The reverse feedback that integral capacity C3 is formed can guarantee that circuit working ripple is less, as far as possible less by external interference. Feedback resistance R12 exports negative terminal acquired signal from oil-pin position excitation and inputs negative terminal to U4A, it is possible to guaranteeing that output amplitude is stablized, restricted flow resistance R17 does not affect.
In order to restraint speckle and external disturbance, engine oil-pin position 2500HZ sine-wave excitation output plus terminal and 2500HZ sine-wave excitation export has, between negative terminal, the electrical condenser C6 and resistance R18 that are cascaded, these two devices can the too high undesired signal of absorption frequency, make sine wave output level and smooth further.
Consult Fig. 3. The circuit that U12A and U12B is formed is excitation passage sine wave amplification circuit, the circuit that U16A, U17A and U18 are formed is half-wave control unit, the circuit that U13A is formed is for encouraging passage sine wave to turn half wave circuit, and the circuit that U13B is formed turns DC voltage circuit for encouraging passage half-wave; The circuit that U14A is formed is that SIN passage sine wave amplifies circuit, and the circuit that U19A is formed is that SIN passage sine wave turns half wave circuit, and the circuit that U19B is formed is that SIN passage half-wave turns DC voltage circuit; The circuit that U14B is formed is that COS passage sine wave amplifies circuit, and the circuit that U20A is formed is that COS passage sine wave turns half wave circuit, and the circuit that U20B is formed is that COS passage half-wave turns DC voltage circuit.
For preventing high-frequency interferencing signal from inputting, guarantee that sinusoidal wave amplifier output waveform is level and smooth, amplifying in circuit in oil-pin position excitation, the parallel filtering being connected with electrical condenser C17 and resistance R36 formation between the positive input of the operational amplifier U12B of the sinusoidal wave amplification grade circuit of excitation and ground absorbs circuit, amplify in circuit in oil-pin position excitation, between the positive input of operational amplifier U14A and ground of the sinusoidal wave amplification grade circuit of cosine cos, it is connected with the parallel filtering that electrical condenser C24 and resistance R56 forms absorbs circuit, between the positive input of operational amplifier U14B and ground of the sinusoidal wave amplification grade circuit of sinusoidal SIN, it is connected with the parallel filtering that electrical condenser C28 and resistance R68 forms absorbs circuit. for guaranteeing the tolerance range that amplifier amplitude is amplified, avoid high input voltage simultaneously, big current signal corruption circuit, these amplification circuit are all input and feedback resistance is all high precision high resistance resistance, these resistance are respectively excitation input and are just holding resistance R33 and excitation input negative terminal resistance R34, cosine cos inputs and is just holding resistance R53 and input negative terminal resistance R54, resistance R65 and input negative terminal resistance R66 is just being held in sinusoidal SIN input, the feedback resistance R35 of the sinusoidal wave amplification grade circuit in three roads, R57, R69, these resistance are all directly affect amplifier magnification ratio and sine wave output amplitude, require that resistance value error precision is less than 0.1%, resistance is more than or equal to 100K, temperature is waftd and is less than 10ppm/K.
In order to suppress interference further, it is ensured that sinusoidal wave amplifier stable output, there is the C18 of integral capacity as reverse feedback device at the operational amplifier U12B of the sinusoidal wave amplification grade circuit of excitation; The C25 reverse feedback device of integral capacity is had at the operational amplifier U14A of the sinusoidal wave amplification grade circuit of cosine cos; The C29 reverse feedback device of integral capacity is had at the operational amplifier U14B of the sinusoidal wave amplification grade circuit of sinusoidal SIN.
Process in circuit at oil-pin position, for the input signal suppressing amplitude higher, avoid circuit to damage, it is ensured that circuit working is stablized, just hold Finite Amplitude twin diode Q11 in parallel between resistance R33 and excitation input negative terminal resistance R34 in excitation sinusoidal wave amplification grade circuit excitation input. Cosine Cos inputs and is just holding Finite Amplitude twin diode Q12 in parallel between resistance resistance R53 and input negative terminal resistance R54; Finite Amplitude twin diode Q13 in parallel between resistance R65 and input negative terminal resistance R66 is just being held in sinusoidal SIN input.
U12A export sine wave sequentially through the anti-phase amplification of operational amplifier U16A and U17A shaping anti-phase after be converted to square wave, when the positive half cycle of sine wave arrives, U17A exports 5V square wave, this square wave is converted to the pulse ground connection signal of three tunnels isolation through electronic switch U18, this three tunnels ground connection signal divide be clipped to excitation, sinusoidal SIN, cosine cos passage sine wave turn the assistance of half-wave unit sine wave signal be converted to half-wave voltage signal. U12A export the sinusoidal wave load that forms through resistance R37 to resistance R45 and C20 of excitation and filtering circuit after to U12B, through U12B penetrate with after amplifying to excitation sine wave turn half wave circuit.
The excitation that U12B, U14A, U14B export respectively, sinusoidal SIN, the sinusoidal wave stage of amplification in cosine cos tri-road output signal respective sine wave and turn half-wave amplification circuit. U13A sine wave turns half-wave amplification electricity routing resistance R47 and R49 and determines magnification; U19A sine wave turns half-wave amplification electricity routing resistance R59 and R61 and determines magnification; U20A sine wave turns half-wave amplification electricity routing resistance R71 and R73 and determines magnification, and these resistance adopts resistance value error precision to be less than 0.1%, and temperature is waftd and is less than the resistance of 10ppm/K. Guaranteeing that sine wave turns half-wave amplification circuit stable output anti-interference, U13A has the C21 of integral capacity as reverse feedback device; U19A has integral capacity C26 to be reverse feedback device; U20A has integral capacity C30 to be reverse feedback device.
When the negative half cycle of input sine wave arrives, electronic switching device U18 exports ground connection signal, this ground connection signal amplifies circuit input and is just holding connect two resistance to act on mutually with U13A, U19A, U20A so that input signal is carried out anti-phase amplification by operational amplifier U13A, U19A, U20A; When the positive half cycle of input sine wave arrives, electronic switch U18 does not export ground connection signal, and input signal is carried out normal homophase amplification by operational amplifier U13A, U19A, U20A. Turn half-wave unit circuit through U13A, U19A, U20A amplifier formation sine wave and just 2500HZ sine wave is just converted to 5000HZ half-wave voltage signal.
5000HZ half-wave voltage signal is transformed to level and smooth volts DS after operational amplifier U13B, U19B, U20B filter shape that half-wave turns DC voltage circuit. Resistance R51 and electric capacity C22 is that filtering is just being held in the input of U13B amplifier, and half-wave is carried out integration by reverse feedback integral capacity C23; Resistance R63 and electric capacity C14 is that filtering is just being held in the input of U19B amplifier, and half-wave is carried out integration by reverse feedback integral capacity C27;Resistance R75 and electric capacity C31 is that filtering is just being held in the input of U20B amplifier, and half-wave is carried out integration by reverse feedback integral capacity C32, and such half-wave voltage signal is just converted to level and smooth direct current signal. It is a simple and effective integral filtering circuit that half-wave turns the amplifier of volts DS unit, and its output voltage signal ripple is very little, it is possible to greatly improves and gathers voltage precision.
The direct current output voltage size of excitation, sinusoidal SIN, cosine cos tri-road acquisition channel directly and Angle Position sensor excitation, sinusoidal SIN, cosine cos input sine wave amplitude be directly proportional, the amplitude of general excitation immobilizes, can be as the reference voltage after AD conversion, sinusoidal SIN, cosine cos passage output voltage numerical value after AD conversion contain engine oil pin position angle information, and engine electronic control system device CPU calculates oil-pin position angle according to sine value and cosine value.
Claims (1)
1. an engine oil needle position sensor detection circuit, comprise square wave and turn sinewave circuit, circuit is amplified in oil-pin position excitation, oil-pin position excitation output unit, sine wave turns square wave unit, sine wave turns half-wave unit and half-wave turns volts DS unit, it is characterized in that: turn in sinewave circuit at square wave, operational amplifier U3A, U2A, the 2500HZ that the 2500HZ square wave that controller CPU is exported by the conversion circuit that U1A and U1B is formed is converted to standard is sinusoidal wave, wherein operational amplifier U3A is by sinusoidal wave for square wave conversion, the 2500HZ sine wave that U3A is exported by operational amplifier U2A carries out amplitude amplification, operational amplifier U1A, U1B forms the feedback loop changing U3A input signal amplitude, the signal exported from power amplifier U2B forms limiting circuit suppression output voltage amplitude by twin diode Q2, the signal exported from power amplifier U4A suppresses output voltage amplitude by twin diode Q3 limiting circuit, the output signal of power amplifier offset of sinusoidal wave amplitude operational amplifier U2A carries out power magnification, the just end of Angle Position sensor excitation is outputted to by resistance R16 current limliting, integral capacity C2 forms reverse feedback, and feedback resistance R7 encourages output plus terminal acquired signal to input negative terminal to U2B from oil-pin position, the 2500HZ sine wave that operational amplifier U3B amplifies circuit output carries out power magnification by operational amplifier U4A, the negative terminal of pin position transducer excitation is outputted to by current limliting resistance R17, the reverse feedback that integral capacity C3 is formed, feedback resistance R12 exports negative terminal acquired signal from oil-pin position excitation and inputs negative terminal to U4A, it is reverse that 2500HZ sine wave amplifies circuit by operational amplifier U3B, and U3B input/output terminal cross-over connection has the resistance R11 determining magnification and the integral capacity C10 improving ripple, it is provided with, between oil-pin position excitation amplification circuit output plus terminal and output negative terminal, the electrical condenser C6 and resistance R18 that are cascaded, amplifying in circuit in oil-pin position excitation, the parallel filtering being connected with electrical condenser C17 and resistance R36 formation between the positive input of the operational amplifier U12B of the sinusoidal wave amplification grade circuit of excitation and ground absorbs circuit, amplify in circuit in oil-pin position excitation, between the positive input of operational amplifier U14A and ground of the sinusoidal wave amplification grade circuit of cosine cos, it is connected with the parallel filtering that electrical condenser C24 and resistance R56 forms absorbs circuit, between the positive input of operational amplifier U14B and ground of the sinusoidal wave amplification grade circuit of sinusoidal SIN, it is connected with the parallel filtering that electrical condenser C28 and resistance R68 forms absorbs circuit, the C18 of integral capacity is had as reverse feedback device at the operational amplifier U12B of the sinusoidal wave amplification grade circuit of excitation,The C25 reverse feedback device of integral capacity is had at the operational amplifier U14A of the sinusoidal wave amplification grade circuit of cosine cos; The C29 reverse feedback device of integral capacity is had at the operational amplifier U14B of the sinusoidal wave amplification grade circuit of sinusoidal SIN; When the negative half cycle of input sine wave arrives, electronic switching device U18 exports ground connection signal, this ground connection signal amplifies circuit input and is just holding connect two resistance to act on mutually with U13A, U19A, U20A so that input signal is carried out anti-phase amplification by operational amplifier U13A, U19A, U20A; When the positive half cycle of input sine wave arrives, electronic switch U18 does not export ground connection signal, and input signal is carried out normal homophase amplification by operational amplifier U13A, U19A, U20A; Turn half-wave unit circuit through U13A, U19A, U20A amplifier formation sine wave and just 2500HZ sine wave is just converted to 5000HZ half-wave voltage signal, the square wave signal that square wave turns sinewave circuit in the future self-controller CPU is converted to the same frequency sine-wave signal of two-way standard, outputs to oil-pin position excitation output unit respectively by two-way power stage amplifier after reverse operational amplifier amplifies; The sine wave that the sinusoidal wave stage of amplification of excitation exports is shaped as the same frequency ground connection square wave signal of three road sign standards through comparer and shaping circuit, the sine wave that oil-pin position excitation is delivered to ground connection square wave signal frequently in three tunnels, sinusoidal SIN, cosine COS detect passage turns half-wave unit group, the sinusoidal wave lower half upset exported by sinusoidal wave stage of amplification is frequency multiplication half-wave voltage signal, frequency multiplication half-wave voltage signal turns volts DS unit group filtering by the half-wave on three tunnel detection passages, shaping is transformed to level and smooth volts DS, and delivers to a/d converter and be converted to magnitude of voltage; Engine electronic control system device CPU is according to the trigonometrical function relation of AD conversion magnitude of voltage, calculate oil-pin position size, judge whether the excitation of oil outer needle position sensor, sinusoidal SIN, cosine COS tri-winding impedance and phase place mate, whether there is the situation of short circuit, open circuit.
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| CN105774782B (en) * | 2014-12-24 | 2019-11-15 | 深圳开阳电子股份有限公司 | A kind of wheel speed transducing signal processing circuit and automobile ABS system |
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| CN109557858B (en) * | 2018-12-10 | 2020-11-03 | 中国航发南方工业有限公司 | RVDT conversion circuit and electronic controller |
| CN109798192B (en) * | 2019-01-15 | 2020-02-14 | 中国科学院工程热物理研究所 | Method for self-detecting faults of linear displacement sensor of aircraft engine oil needle |
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