CN110086447A - A kind of speed signal conditioning circuit of classification filtering - Google Patents
A kind of speed signal conditioning circuit of classification filtering Download PDFInfo
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- CN110086447A CN110086447A CN201910203939.0A CN201910203939A CN110086447A CN 110086447 A CN110086447 A CN 110086447A CN 201910203939 A CN201910203939 A CN 201910203939A CN 110086447 A CN110086447 A CN 110086447A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Acoustics & Sound (AREA)
- Filters And Equalizers (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The purpose of the present invention is to provide a kind of speed signal conditioning circuits of classification filtering, including classification filter circuit, voltage comparator circuit and isolation shaping circuit.After the tach signal input of diesel engine carries out the filtering of different frequency interference signal by classification filter circuit, it is input to voltage comparator circuit, voltage comparator circuit carries out voltage and compares the high low logic level of output, exports square-wave signal via the signal isolation shaping of isolation shaping circuit.The present invention improves the ability of diesel engine speed conditioning circuit processing different frequency interference signal, ensure that the stability of tach signal using component type is few, structure is simple, easy to accomplish.
Description
Technical field
The present invention relates to a kind of diesel engine electric control devices, specifically diesel engine speed signal conditioning circuit.
Background technique
Nowadays, electron controls technology has been widely used in daily production and living, the control method of diesel engine
Also it is controlled by original mechanical control development for electronic type.The electronic control of diesel engine is each by what is installed on diesel engine
The measuring signal of kind sensor feedback, is handled through corresponding conditioning circuit, and by treated, feedback signal is input to control system
In, control is adjusted in control system based on the feedback signal.The electronic control of diesel engine includes fuel Injection Control, idle speed control
With air inlet control etc..Important feedback signal of the tach signal as control diesel engine operation, the design of conditioning circuit are especially heavy
It wants.The tach signal of diesel engine has the characteristics that frequency range is wider, and the interference of different frequency is adulterated in tach signal
Signal, it is very unfavorable to Diesel Engine Control.Therefore, in design speed signal conditioning circuit, it is considered as the filter of wide range of frequencies
Wave design, minimizes interference, guarantees the undistorted of tach signal.
It in the design of existing speed signal conditioning circuit, is filtered using single-stage RC, noise more than a certain frequency is filtered
Wave, the noise without considering different frequency range.Such as: the patent of publication number CN204758622U (publication date on November 11st, 2015)
A kind of signal processing circuit of magnetoelectric tachometric transducer is disclosed, CN202353530U's (publication date on July 25th, 2012)
Utility model discloses a kind of tach signal processing circuit, Publication No. CN104569473B (publication date on October 24th, 2017)
A kind of engineering machinery rotary speed of diesel engine measurement method of disclosure of the invention, the above patent turns without reference to what frequency-division section filtered
Fast conditioning circuit.
Summary of the invention
The purpose of the present invention is to provide can be improved diesel engine speed conditioning circuit processing different frequency interference signal
Ability guarantees a kind of speed signal conditioning circuit of classification filtering of tach signal stability.
The object of the present invention is achieved like this:
A kind of speed signal conditioning circuit of classification filtering of the present invention, it is characterized in that: including classification filter circuit, diesel engine
Tach signal input by classification filter circuit carry out the filtering of different frequency interference signal after, through voltage comparator circuit and isolation
Shaping circuit exports square-wave signal；
The classification filter circuit includes the first zener diode (D9), the second zener diode (D10), freewheeling diode
(D21), first resistor (R54), second resistance (R55), first capacitor (C18), the second capacitor (C19), first resistor (R54)
One end connects the pin 1 of freewheeling diode (D21), another termination PGND of freewheeling diode (D21), and first resistor (R54) is another
One end of first capacitor (C18) and second resistance (R55) are terminated, the other end of first capacitor (C18) meets freewheeling diode (D21)
Pin 2, the pin 1 of the second zener diode of another termination (D10) of second resistance (R55), the second zener diode (D10)
Pin 2 connect the other end of first capacitor (C18)；First zener diode (D9) is in parallel with first resistor (R54), the first pressure stabilizing
The pin 1 of diode (D9) connects the side of signal input, and pin 2 connects the other end of first resistor (R54), the second capacitor (C19)
It is in parallel with the second zener diode (D10).
The present invention may also include:
1, voltage comparator circuit includes voltage comparator, 3rd resistor (R56), the 4th resistance (R59), the 5th resistance
(R52), the pin 2 of third capacitor (C20), voltage comparator are connected with 3rd resistor (R56), the pin 3 of voltage comparator
Be connected with one end of the 4th resistance (R59) and third capacitor (C20), the 4th resistance (R59) and third capacitor (C20) it is another
End, which is connected, is followed by the pin 4 of voltage comparator, and the pin 8 of voltage comparator connects power supply, a termination voltage of the 5th resistance (R52)
The pin 3 of comparator, the pin 1 of another termination voltage comparator.
2, the shaping isolation circuit includes optocoupler, the 6th resistance (R50), the 7th resistance (R51), 1 He of pin of optocoupler
The pin 2 of voltage comparator is connected, and the pin 1 of optocoupler is connected with one end of the 6th resistance (R50), the 6th resistance (R50) it is another
One end is connected with power supply, and the pin 4 of optocoupler is connected with one end of the 7th resistance (R51), the other end and electricity of the 7th resistance (R51)
Source is connected.
3, first resistor (R54), first capacitor (C18) and the first zener diode (D9) being classified in filter circuit are constituted
First order low-pass filter circuit；Second resistance (R55) and the second capacitor (C19) constitute second level low-pass filter circuit；
When diesel engine works, tach signal is input in classification filter circuit with sine wave, when the slow-speed of revolution, revolving speed
It is higher than first order filter circuit cutoff frequency f in signal1Interference signal filtered；When high revolving speed, tach signal frequency f is big
In the cutoff frequency f of first order filter circuit1, electric conduction of the voltage magnitude higher than the first zener diode (D9) of tach signal
Pressure, using the reverse breakdown characteristics of voltage-stabiliser tube, high frequency tach signal is through the first zener diode (D9), by second level filter circuit
To the high-frequency interferencing signal filtering in high frequency tach signal, the reversed input of voltage comparator is input to through 3rd resistor (R56)
Hysteresis comparison is carried out in pin 2, the pin 1 of voltage comparator exports high level or low level, is isolated by the shaping of optocoupler, defeated
Square-wave signal out.
Present invention has an advantage that the present invention improves diesel oil using component type is few, structure is simple, easy to accomplish
Machine revolving speed conditioning circuit handles the ability of different frequency interference signal, ensure that the stability of tach signal.
Detailed description of the invention
Fig. 1 is the structural block diagram of circuit of the present invention；
Fig. 2 is classification filter circuit schematic diagram；
Fig. 3 is embodiment schematic diagram.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
In conjunction with Fig. 1-3, attached drawing 1 is the structural block diagram of circuit of the present invention, including classification filter circuit, voltage comparator circuit and
Shaping circuit is isolated.It is defeated after the tach signal input of diesel engine carries out the filtering of different frequency interference signal by classification filter circuit
Enter to voltage comparator circuit, voltage comparator circuit carries out voltage and compares the high low logic level of output, via isolation shaping electricity
The signal isolation shaping on road exports square-wave signal.
Attached drawing 2 is the classification filter circuit schematic diagram of circuit of the present invention, including zener diode D9 and D10, resistance R54,
Resistance R55, capacitor C18, capacitor C19.Wherein, one end of resistance R54 connects the pin 1 of freewheeling diode D21, freewheeling diode
The other end of one end of another termination PGND of D21, resistance R54 another termination capacitor C18 and resistance R55, capacitor C18 connects stream
The pin 2 of diode D21, the pin 1 of another termination zener diode D10 of resistance R55, the pin 2 of D10 connect capacitor C18's
The other end.Zener diode D9 is in parallel with resistance R54, and the pin 1 of zener diode D9 connects the side of signal input, and pin 2 connects
The other end of resistance R54.Capacitor C19 is in parallel with zener diode D10.
Resistance R54, capacitor C18 and voltage-stabiliser tube D9 in the classification filter circuit constitute first order low-pass filtering electricity
Road.Resistance R55 and capacitor C19 constitutes second level low-pass filter circuit.
Attached drawing 3 is the embodiment schematic diagram of circuit of the present invention, which is used for magnetoelectric sensor, revolving speed input letter
Number in the case where sine wave.It in this embodiment include classification filter circuit, voltage comparator circuit and shaping isolation electricity
Road.Wherein voltage comparator circuit uses the connection type of hysteresis loop comparator, and voltage comparator circuit and shaping isolation circuit are only
For embodiment, need can be used other forms connection type according to different.
Such as attached drawing 3, voltage comparator circuit specifically includes voltage comparator U13A (model LM2903), connection type
Are as follows: the pin 2 of voltage comparator U13A is connected with resistance R56, the pin 3 and resistance R59 and capacitor of voltage comparator U13A
One end of C20 is connected, and connects after the other end of resistance R59 and capacitor C20 are connected with the pin 4 of voltage comparator U13A, electricity
The pin 8 of pressure comparator U13A connects 15V power supply.The pin 3 of a termination voltage comparator U13A of resistance R52, another termination electricity
The pin 1 of comparator U13A is pressed, positive feedback is introduced, hysteresis is constituted and compares.
Shaping isolation circuit specifically includes optocoupler U12 (model PS2801-1), and connection type is the pin of optocoupler U12
1 is connected with the pin 2 of voltage comparator U13A, and the pin 1 of optocoupler U12 is connected with one end of resistance R50, and resistance R50's is another
End is connected with 15V power supply.The pin 4 of optocoupler U12 is connected with one end of resistance R51, the other end and the power supply VCC phase of resistance R51
Connection.
When diesel engine works normally, the tach signal of magnetoelectric sensor measurement is input in circuit with sine wave,
When the slow-speed of revolution, first order filter circuit cutoff frequency f is higher than in tach signal1Interference signal filtered；When high revolving speed,
Tach signal frequency f is greater than the cutoff frequency f of first order filter circuit1, the voltage magnitude of tach signal is higher than voltage-stabiliser tube D9's
Conducting voltage, using the reverse breakdown characteristics of voltage-stabiliser tube, high frequency tach signal is through voltage-stabiliser tube D9, by the filter circuit pair of the second level
In high frequency tach signal high-frequency interferencing signal filtering, through resistance R56 be input in the reversed input pin 2 of voltage comparator into
Row hysteresis compares, and according to the difference of tach signal voltage magnitude, the pin 1 of voltage comparator U13A exports high level or low electricity
It is flat, it is isolated by the shaping of optocoupler U12, exports square-wave signal.
Claims (4)
1. a kind of speed signal conditioning circuit of classification filtering, it is characterized in that: including classification filter circuit, the revolving speed letter of diesel engine
Number input by classification filter circuit carry out the filtering of different frequency interference signal after, through voltage comparator circuit and isolation shaping electricity
Road exports square-wave signal；
The classification filter circuit includes the first zener diode (D9), the second zener diode (D10), freewheeling diode
(D21), first resistor (R54), second resistance (R55), first capacitor (C18), the second capacitor (C19), first resistor (R54)
One end connects the pin 1 of freewheeling diode (D21), another termination PGND of freewheeling diode (D21), and first resistor (R54) is another
One end of first capacitor (C18) and second resistance (R55) are terminated, the other end of first capacitor (C18) meets freewheeling diode (D21)
Pin 2, the pin 1 of the second zener diode of another termination (D10) of second resistance (R55), the second zener diode (D10)
Pin 2 connect the other end of first capacitor (C18)；First zener diode (D9) is in parallel with first resistor (R54), the first pressure stabilizing
The pin 1 of diode (D9) connects the side of signal input, and pin 2 connects the other end of first resistor (R54), the second capacitor (C19)
It is in parallel with the second zener diode (D10).
2. the speed signal conditioning circuit of a kind of classification filtering according to claim 1, it is characterized in that: voltage comparator is electric
Road includes voltage comparator, 3rd resistor (R56), the 4th resistance (R59), the 5th resistance (R52), third capacitor (C20), voltage
The pin 2 of comparator is connected with 3rd resistor (R56), the pin 3 of voltage comparator and the 4th resistance (R59) and third capacitor
(C20) one end is connected, and the 4th resistance (R59) is connected with the other end of third capacitor (C20) is followed by drawing for voltage comparator
Foot 4, the pin 8 of voltage comparator connect power supply, the pin 3 of a termination voltage comparator of the 5th resistance (R52), another termination electricity
Press the pin 1 of comparator.
3. the speed signal conditioning circuit of a kind of classification filtering according to claim 2, it is characterized in that: the shaping is isolated
Circuit includes optocoupler, the 6th resistance (R50), the 7th resistance (R51), and the pin 1 of optocoupler is connected with the pin 2 of voltage comparator,
The pin 1 of optocoupler is connected with one end of the 6th resistance (R50), and the other end of the 6th resistance (R50) is connected with power supply, the pipe of optocoupler
Foot 4 is connected with one end of the 7th resistance (R51), and the other end of the 7th resistance (R51) is controlled to a power supply.
4. the speed signal conditioning circuit of a kind of classification filtering according to claim 3, it is characterized in that: classification filter circuit
In first resistor (R54), first capacitor (C18) and the first zener diode (D9) constitute first order low-pass filter circuit；The
Two resistance (R55) and the second capacitor (C19) constitute second level low-pass filter circuit；
When diesel engine works, tach signal is input in classification filter circuit with sine wave, when the slow-speed of revolution, tach signal
In be higher than first order filter circuit cutoff frequency f1Interference signal filtered；When high revolving speed, tach signal frequency f is greater than the
The cutoff frequency f of level-one filter circuit1, conducting voltage of the voltage magnitude higher than the first zener diode (D9) of tach signal,
Using the reverse breakdown characteristics of voltage-stabiliser tube, high frequency tach signal is through the first zener diode (D9), by second level filter circuit pair
High-frequency interferencing signal filtering in high frequency tach signal, the reversed input for being input to voltage comparator through 3rd resistor (R56) are drawn
Hysteresis comparison is carried out in foot 2, the pin 1 of voltage comparator exports high level or low level, is isolated by the shaping of optocoupler, output
Square-wave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910203939.0A CN110086447B (en) | 2019-03-18 | 2019-03-18 | Graded filtering rotational speed signal conditioning circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910203939.0A CN110086447B (en) | 2019-03-18 | 2019-03-18 | Graded filtering rotational speed signal conditioning circuit |
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| CN110086447B CN110086447B (en) | 2023-09-29 |
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