CN102809689A

CN102809689A - Anti-zero-crossing oscillation engine magneto-electric sensor conditioning circuit

Info

Publication number: CN102809689A
Application number: CN2012102531203A
Authority: CN
Inventors: 褚全红; 白思春; 陈志瑞; 王孝; 焦玉琴; 张春; 李向荣
Original assignee: No70 Inst China Weaponry Industry Group
Current assignee: No70 Inst China Weaponry Industry Group
Priority date: 2012-07-23
Filing date: 2012-07-23
Publication date: 2012-12-05
Anticipated expiration: 2032-07-23
Also published as: CN102809689B

Abstract

The invention discloses an anti-zero-crossing oscillation engine magneto-electric sensor conditioning circuit. The anti-zero-crossing oscillation engine magneto-electric sensor conditioning circuit comprises a conditioning circuit input end (1), a trigger U1A (2), a comparator U2A (3), a comparator U2B (4), a filter capacitor C1 (5), a feedback capacitor C3 (6), a voltage regulator tube Z1 (7), eleven resistors and more than two conducting wires, wherein the conditioning circuit input end (1) is IN and GND. By using the anti-zero-crossing oscillation engine magneto-electric sensor conditioning circuit, the anti-oscillation triggering can be finished; the phase of an engine can be determined accurately; only a single 5V power supply is required; universal comparators and universal triggers are adopted; the overall structure is simple; and the stability and the reliability are easily ensured.

Description

A kind of engine magnetoelectric sensor adjusting circuit of anti-zero passage vibration

Technical field

Invention belongs to engine magnetoelectric sensor technical field, is specifically related to a kind of engine magnetoelectric sensor adjusting circuit of anti-zero passage vibration.

Background technology

In the high-pressure common rail engine fuel control, for the engine phase place accurately confirm it is vital, it directly affects the controlling performance of engine.

The engine phase place that adopts at present confirms that method is on the cam disc, crankshaft disk at engine magnetoelectric tachometric transducer to be installed, and handles out pulse signal with the sine wave signal of sensor output through comparer, confirms the phase place of engine.

But in use; Because the output of magnetoelectric sensor is sine wave signal; And along with the high-low signal amplitude of rotating speed is changing, the forward position of the rectangular wave pulse signal of conventional signal conditioning circuit output can cause the phase place of engine to change along with the tach signal amplitude changes with the edge, back like this; Need compensate with the mode of software height according to rotating speed; But receive the not equal factor affecting of sensor assemblage gap, final phase place is confirmed still to have certain error, influences the accurate control of engine.

Summary of the invention

The present invention receives the not equal factor affecting of sensor assemblage gap in order to solve, and final phase place is confirmed still to have certain error, influences the accurately problem of control of engine.

Technical scheme of the present invention:

A kind of engine magnetoelectric sensor adjusting circuit of anti-zero passage vibration; Comprise modulate circuit input end, trigger U1A, comparer U2A, comparer U2B, filter capacitor C1, feedback capacity C3, stabilivolt Z1 and 11 resistance and the lead more than 2; The modulate circuit input end is IN and GND; Input signal IN connects the end of input resistance R1, the end of filter resistance R2, and the other end of R1 is connected to GND;

The other end of R2 is connected to the end of filter capacitor C1, the anode of stabilivolt Z1, the end of comparer U2B negative input resistance R3, the end of comparer U2A negative input resistance R4; The negative terminal of the other end of filter capacitor C1, stabilivolt Z1 is connected to GND; The other end of R3 is connected to comparer U2B negative input end 6 pin, and the other end of R4 is connected to comparer U2A negative input end 2 pin;

The end of divider resistance R9 is connected to 5V, and the other end is connected to an end of comparer U2A positive input resistance R 5, the end of divider resistance R8, and the other end of R8 is connected to GND, and the other end of R5 is connected to comparer U2A positive input terminal 3 pin;

Output terminal 1 pin of comparer U2A is connected to the end of pull-up resistor R11, CLR end (clear terminal) 1 pin of trigger U1A, and the other end of R11 is connected to 5V, and voltage end 8 pin of comparer U2A are connected to 5V, and ground holds 4 pin to be connected to GND;

Positive input terminal 5 pin of comparer U2B are connected to the end of stake resistance R6, the end of feedback resistance R7; The other end of R6 is connected to GND; The other end of R7 is connected to the end of feedback capacity C3; The other end of C3 is connected to output terminal 7 pin than device U2B, the end of pull-up resistor R10, CLK end (trigger pulse end) 3 pin of trigger U1A, and the other end of pull-up resistor R10 is connected to 5V;

D end (input end) 2 pin of trigger U1A, power supply VCC hold 14 pin, PRE end (set end) 4 pin to be connected to 5V, and GND holds 7 pin to be connected to GND, and Q end (positive output end) 5 pin are connected to output signal OUT end.

Beneficial effect of the present invention:

1. anti-vibration trigger circuit part can be accomplished anti-vibration and trigger;

2. " zero passage " comparator circuit part can accurately be confirmed the engine phase place;

3. only need single 5V power supply, adopt general comparer and trigger, one-piece construction is simple, and stability and reliability all are easy to guarantee.

Description of drawings

Fig. 1 is a circuit connection diagram of the present invention;

Fig. 2 is signal output waveform figure of the present invention.

Embodiment

The concrete course of work of the present invention is following:

The output signal of magnetoelectric sensor is connected to IN, the GND two ends of input resistance R1, and the R1 principal security makes input end be connected to GND when modulate circuit does not connect input signal, avoids input signal unsettled, non-steady state occurs; Input signal IN carries out first-order filtering through filter resistance R2, filter capacitor C1, carries out amplitude limit through stabilivolt simultaneously and forms comparison signal u1; Signal u1 and divider resistance R9, the last dividing potential drop threshold voltage u0 of R8 are input to negative input end and the positive output end of comparer U2A respectively through input resistance R4, R5; The anti-vibration of comparer output signal out1; Mainly in order to satisfy the Lou output of opening of U2A, threshold voltage u0 is provided with mainly in order to restrain relatively output of undesired signal appearance significantly pull-up resistor R11.

Signal u1 is input to the negative input end of comparer U2B through input resistance R3; Compare with the no-voltage of positive input terminal; Form " zero passage " comparison output signal out2, wherein to make the positive input terminal voltage of comparer U2B be zero to stake resistance, and feedback resistance R7, feedback capacity C3 mainly make in order to make comparer U2B form certain comparison return difference; Relatively output appears in the undesired signal of restraining by a small margin, and pull-up resistor R10 is mainly in order to satisfy the Lou output of opening of U2B.

The rising edge of signal out1 is before the rising edge of signal out2, and the negative edge of signal out1 is after the negative edge of signal out2; When the rising edge of signal ou2, the D input end of trigger, PRE set end signal are 5V, and CLR clear terminal out1 signal is 5V, and trigger output signal OUT is a high level signal; Inoperative during the negative edge of signal out2, the output signal of trigger still is a high level signal, the low level zero clearing output terminal behind the signal out1 negative edge, and making trigger output signal OUT is low level signal; To be input sine wave signal IN trigger from just to negative " zero passage " time rising edge of output signal OUT forms; The changes in amplitude along with sine wave signal IN does not squint; Can guarantee in whole engine operation scope, phase change not occur, realize control accurately.

The present invention is based upon on " zero passage " basis relatively; Be made up of " zero passage " comparator circuit and anti-vibration trigger circuit two parts: anti-vibration trigger circuit compare output according to the threshold voltage that is provided with; The output rectangular wave pulse signal latchs the output low level signal, accomplishes anti-vibration and triggers; One of " zero passage " comparator circuit completion is just becoming negative " zero passage " relatively exports, and makes the forward position of output square wave occur in " zero passage " point, along with rotating speed height (signal amplitude size) changes, can not guarantee that the engine phase place is definite accurately; Because this modulate circuit only needs single 5V power supply, adopt general comparer and trigger simultaneously, one-piece construction is simple, and stability and reliability all are easy to guarantee.

Claims

1. the engine magnetoelectric sensor adjusting circuit of an anti-zero passage vibration; Comprise modulate circuit input end (1), trigger U1A (2), comparer U2A (3), comparer U2B (4), filter capacitor C1 (5), feedback capacity C3 (6), stabilivolt Z1 (7) and 11 resistance and the lead more than 2; It is characterized in that; Modulate circuit input end (1) is IN and GND; Input signal IN connects the end of input resistance R1, the end of filter resistance R2, and the other end of R1 is connected to GND; The other end of R2 is connected to the end of filter capacitor C1 (5), the anode of stabilivolt Z1 (7), the end of comparer U2B (4) negative input resistance R3, the end of comparer U2A (3) negative input resistance R4; The negative terminal of the other end of filter capacitor C1 (5), stabilivolt Z1 (7) is connected to GND; The other end of R3 is connected to comparer U2B (4) negative input end 6 pin, and the other end of R4 is connected to comparer U2A (3) negative input end 2 pin; The end of divider resistance R9 is connected to 5V, and the other end is connected to an end of comparer U2A (3) positive input resistance R 5, the end of divider resistance R8, and the other end of R8 is connected to GND, and the other end of R5 is connected to comparer U2A (3) positive input terminal 3 pin; Output terminal 1 pin of comparer U2A (3) is connected to the end of pull-up resistor R11, CLR end (clear terminal) 1 pin of trigger U1A (2), and the other end of R11 is connected to 5V, and voltage end 8 pin of comparer U2A (3) are connected to 5V, and ground holds 4 pin to be connected to GND; Positive input terminal 5 pin of comparer U2B (4) are connected to the end of stake resistance R6, the end of feedback resistance R7; The other end of R6 is connected to GND; The other end of R7 is connected to the end of feedback capacity C3 (6); The other end of C3 is connected to output terminal 7 pin than device U2B, the end of pull-up resistor R10, CLK end (trigger pulse end) 3 pin of trigger U1A (2), and the other end of pull-up resistor R10 is connected to 5V; D end (input end) 2 pin of trigger U1A (2), power supply VCC hold 14 pin, PRE end (set end) 4 pin to be connected to 5V, and GND holds 7 pin to be connected to GND, and Q end (positive output end) 5 pin are connected to output signal OUT end.