CN109899194A - One kind controlling ignited gasoline engine tooth signal recognition circuit based on thyristor - Google Patents

Abstract

The invention discloses one kind to control ignited gasoline engine tooth signal recognition circuit based on thyristor, the circuit includes the ignition signal identification circuit of TCI (thyristor control igniting) ignition system, control circuit and driving circuit include single-chip microcontroller (MCU) in the control circuit.Technical purpose of the invention is to provide a kind of ignition signal by identifying TCI ignition system and controls oil spout, and this method can effectively reduce oil consumption, achieve energy-saving and emission reduction purposes.Small power consumption of the present invention, at low cost, the electric injection system suitable for most of petrol engine using TCI ignition system is reequiped.

Description

One kind controlling ignited gasoline engine tooth signal recognition circuit based on thyristor

Technical field

The present invention relates to petrol engine electric injection systems, provide a kind of based on thyristor control ignited gasoline engine tooth Signal recognition circuit, when tooth signal is that electric spray control system calculates and controls distributive value required for each cylinder of engine and oil spout The key parameter at quarter.

Background technique

The non-contact electronic ignition system of modern gasoline engine has: capacitive discharge ignition device, abbreviation CDI igniting dress It sets；Transistor controls mode igniter, abbreviation TCI igniter.Both igniters significantly improve ignition system work The stability and reliability of work.However the raising of engine fuel efficiency also needs electric injection control device (abbreviation ECU, similarly hereinafter) right The oil spout of engine is controlled, and ECU is by various sensors by the temperature of engine, air-fuel ratio, throttle situation, engine The signal acquisitions such as revolving speed, load, tooth signal, traveling state of vehicle arrive, and ECU is calculated and controlled and start according to these signal parameters Fuel oil is passed through fuel injector under a certain pressure and is injected to mist in air inlet pipe by distributive value and oil injection time required for each cylinder of machine Change, can greatly improve fuel efficiency.In the process tooth signal identify and judge it is particularly important.

Summary of the invention

In view of this, the tooth signal of the petrol engine the purpose of the present invention is reliable recognition based on TCI igniter.

To achieve the above object, circuit arrangement of the invention is: the permanent magnet when engine flywheel rotation, on flywheel Make the voltage that variation is generated in the ignition coil armature winding of TCI igniter, which touches after rectifier diode The coupling that shines is primary, changes comparator in-phase end voltage also therewith after the conducting of optocoupler secondary, when in-phase end voltage is higher than comparator After the voltage threshold of reverse side, comparator output becomes high level from low level, when in-phase end voltage is lower than comparator reverse side Voltage threshold after, comparator output from high level becomes low level, that is, exports a square-wave signal, reversed using Schmidt Reversed stable square-wave signal is exported after device.

Further, the threshold voltage of the comparator backward end, can by change partial pressure resistance value come adjust apply it is close The pulsewidth of the square-wave signal of special reverser output, the position of top dead centre is corrected with this.

Further, square-wave signal of the square-wave signal of Schmidt's reverser output after conditioning is by monolithic Machine collects, and single-chip microcontroller can calculate the top dead centre and revolving speed of engine, that is, recognizes the tooth signal of engine.

Advantageous effects of the invention: the voltage and rear end that ignition coil armature winding generates in TCI igniter are believed Number isolation, can effectively avoid the interference and impact to late-class circuit.

Detailed description of the invention

Fig. 1 is the principle of the present invention block diagram

Fig. 2 is circuit block diagram of the invention

Specific embodiment

In conjunction with attached drawing, the specific embodiment that the present invention will be described in detail, but claim is not limited in any way.

A kind of tooth signal recognition circuit of the petrol engine based on TCI igniter include rectifier diode, signal every From optocoupler and the threshold value comparison circuit being made of resistance and comparator, schmitt inverter, single-chip microcontroller and power-supplying circuit. When engine flywheel rotation, the permanent magnet on flywheel is in the ignition coil armature winding L1 process Jing Guo TCI igniter In, the voltage of variation is generated in L1, which generates the voltage difference Vd of variation at VK+ and at VK-.Permanent magnet on flywheel When close to armature winding L1 voltage Vd can increase and reach when permanent magnet is closest to armature winding L1 peak value (50V~ 100V), when permanent magnet is far from armature winding L1, Vd, which can be decreased up to, is reduced to 0V, i.e., Vd has pulsatile once in the process Variation.When Vd is greater than 0.6V, which can pass through rectifier diode D1, trigger the primary of optocoupler U1, keep optocoupler secondary Conducting, Vd is bigger, and the electric current for flowing through optocoupler secondary is bigger, and the partial pressure Vdyc of R3 is also bigger.Flywheel turns one, which enclose, makes Vd generation During pulsatile change, when voltage Vdyc is increased above the voltage threshold Vthd of comparator U2 reverse side by 0V, compare Device U2 output becomes high level from low level, and after subsequent Vdyc decreases below voltage threshold Vthd, comparator U2 is exported by height Level becomes low level, that is, generates a square-wave signal, and output Vout of the square-wave signal after Schmidt's reverser U3 is One reversed stable square-wave signal, the square-wave signal obtain tooth signal through software analytical calculation after being input to single-chip microcontroller. Because after permanent magnet is far from armature winding L1, Vd undertension is so that optocoupler primary is connected, so comparator U2 also would not There is square wave output, the output Vout of same reverser U3 is also not square-wave signal.In conclusion flywheel turns one enclose, Vout is only Generate a square-wave signal.It can be defeated to adjust Schmidt's reverser U3 by changing the size of R4 and R5 partial pressure resistance value change Vthd The pulsewidth of square-wave signal Vout can be broadened after the value as reduced Vthd, can be entangled with this by the pulsewidth of square-wave signal Vout out The position of positive top dead centre.After single-chip microcontroller U4 collects the square-wave signal Vout by conditioning, engine can be calculated by software Top dead centre and revolving speed, that is, recognize the tooth signal of engine.

Claims (3)

1. one kind controls ignited gasoline engine tooth signal recognition circuit, the tooth signal including TCI igniter based on thyristor Identification circuit, it is characterised in that: the tooth signal recognition circuit include rectifier diode, signal isolation optocoupler and by resistance and The threshold value comparison circuit that comparator is constituted, schmitt inverter, single-chip microcontroller and power-supplying circuit；When engine flywheel rotates When, the permanent magnet on flywheel makes the voltage that variation is generated in the ignition coil armature winding of TCI igniter, the voltage signal It is primary that optocoupler is triggered after rectifier diode, changes comparator in-phase end voltage also therewith after the conducting of optocoupler secondary, when same After phase terminal voltage is higher than the voltage threshold of comparator reverse side, comparator output becomes high level from low level, when in-phase end electricity It forces down after the voltage threshold of comparator reverse side, comparator output becomes low level from high level, that is, exports a square wave letter Number, using exporting reversed stable square-wave signal after Schmidt's reverser.

2. according to claim 1, a kind of controlling its feature of ignited gasoline engine tooth signal recognition circuit based on thyristor It is, by adjusting the threshold voltage of comparator backward end, the pulsewidth of the square-wave signal of Schmidt's reverser output to be adjusted, with this To correct the position of top dead centre.

3. according to claim 1, a kind of controlling ignited gasoline engine tooth signal recognition circuit based on thyristor, through toning Square-wave signal after reason is collected by single-chip microcontroller, and single-chip microcontroller can calculate the top dead centre and revolving speed of engine, that is, is recognized and started The tooth signal of machine.