CN2471961Y

CN2471961Y - Microprocessor controlled electric ignitor

Info

Publication number: CN2471961Y
Application number: CN 01212590
Authority: CN
Inventors: 高世伦
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-27
Filing date: 2001-02-27
Publication date: 2002-01-16
Anticipated expiration: 2011-02-27

Abstract

The utility model relates to a microprocessor control electronic igniter. A microprocessor, a positive pulse amplification and rectification limiter circuit, a negative pulse trigger circuit, a passage switching relay, a passage switching drive circuit, a thyristor trigger circuit and a low-pass filter circuit form the control circuit of a capacitance-discharging electronic ignition circuit; the load and rotational speed are used to control the engine spark advanced angle, which is a fixed spark advanced angle under starting conditions; even when the microprocessor is in failure, the utility model can also work reliably. The utility model can improve engine power, reduce fuel consumption, emission and the heat load of the engine, and can be applied to the ignition system of various motorcycle engines.

Description

Microprocessor control ignition

The utility model relates to the ignition system of motor petrol motor, is particularly suitable for as motorcycle engine capacitor discharge type ignition.

Combustion principle according to petrol engine, the burning of the inflammable mixture that forms as the gasoline of working medium and air has certain velocity of propagation of flame and period of combustion, and the ignition advance angle of motor is weighed with crank angle, identical period of combustion is when weighing with crank angle, the crank angle of correspondence was just big when rotating speed was high, and the crank angle of correspondence was just little when rotating speed was low.Propagation of flame speed is also relevant with the strength of vortex of gas in the jar, and then heat and mass is fast for the strength of vortex height, and propagation of flame speed is fast, otherwise then little.The size of strength of vortex is relevant with the rotating speed and the structure of motor again.

The velocity of propagation of flame of inflammable mixture is relevant with the air fuel ratio of inflammable mixture with period of combustion, and in the compass that catches fire, air fuel ratio is big, and velocity of propagation of flame is slow, and air fuel ratio flammule velocity of propagation is fast.The air fuel ratio that Carburetor provides is to change with the variation of loading.

Therefore, theory and practice all proves: the optimum igniting advance angle of motor is non-linear with the variation of engine speed and load, is an irregular curved surface.The optimum igniting time of motor should be able to make the burning of motor close on point of detonation.

Although it is multiple that the ignition system of petrol engine has, widespread usage capacitor discharge type breakerless magneto ignition system (be called for short CDI) on motorcycle engine at present.And the electronic spark advance of the CDI ignition system of existing motorcycle gasoline engine is immutable or only carry out the linearly adjust ignition advance angle with change in rotational speed.Adjustable extent is little, and does not consider the influence of load variations to ignition advance angle.Existing motorcycle engine does not generally adopt micro-processor controlled electronic ignitin system, but along with people's improving constantly to motorcycle Economy, emission control requirement, motorcycle engine adopts micro-processor controlled electronic ignitin system quite urgent, so that the ignition advance angle during to engine operation is controlled in real time, improve the performance of motorcycle.

The utility model purpose just is to provide a kind of microprocessor control ignition, adjusts ignition advance angle at any time according to the variation of engine speed, load, makes motor remain optimal ignition angle under various operating conditionss.Reach the purpose of the power, reduction oil consumption, the heat load that reduces motor and the minimizing discharging that improve motor.Even when computer controlled system breaks down, this ignition still can be lighted a fire with fixing ignition advance angle.

The utility model microprocessor control ignition, by electric capacity, the firing circuit that diode and thyristor are formed, firing circuit connects high-tension coil connecting port and charge coil connecting port, it is characterized in that: this ignition has the trigger winding connecting port, displacement transducer connecting port and power connector end mouth, amplify amplitude limiter circuit by microprocessor and positive pulse shaping, the negative impulse trigger circuit, the passage transfer relay, the passage switch driving circuit, thyristor gating circuit and low-pass filter circuit constitute the control circuit of described firing circuit

Described microprocessor comprises CPU, read-only memory under program, random memory, first timer, second timer, analog comparator, A/D converter, interrupting input end, an I/O port, the 2nd I/O port, the microprocessor each several part connects through Internal Bus

The trigger winding connecting port connects the positive pulse shaping respectively and amplifies amplitude limiter circuit and negative impulse trigger circuit, and the positive pulse shaping is amplified the amplitude limiter circuit output terminal and connected analog comparator inverting input, analog comparator in-phase input end connection parameter voltage, analog comparator output terminal connection interrupting input end; Negative impulse trigger circuit connecting passage transfer relay Chang Kaiduan, passage transfer relay output terminal tie point ignition circuit thyristor trigger electrode,

Displacement transducer connecting port series connection low-pass filter circuit is to the A/D converter input end, first timer carries out the rotating speed numeration according to the interrupting input end signal, CPU is according to first timer numerical control the one I/O port level, the one I/O port channels in series switch driving circuit is to passage transfer relay control end, CPU inquires about a bidimensional form that stores in the read-only memory under program according to first timer numerical value and A/D converter numerical value, calculate the spark delay time value and deposit second timer in, CPU is according to second timer numerical control the 2nd I/O port level, and the 2nd I/O port series thyristor trigger circuit are to passage transfer relay normal-closed end.

Aforesaid microprocessor control ignition, described microprocessor can be single-chip microcomputer, wherein also is equipped with watchdog timer, a described I/O port and the 2nd I/O port can be connected to light emitting diode respectively as indicating fault.

Aforesaid microprocessor control ignition, it is further characterized in that the power connector end mouth connects first order filter regulator circuit, the latter connects negative impulse trigger circuit, passage transfer relay, passage switch driving circuit, thyristor gating circuit and second level mu balanced circuit respectively, and second level mu balanced circuit is exported as described power supply of microprocessor.

The utility model adopts microprocessor control, control advance angle of engine ignition jointly by load and rotating speed, the two-dimentional form that is stored in the read-only memory under program can guarantee that the ignition advance angle of motor under any operating mode is optimum value, and the ignition advance angle excursion is big, spending to 52 degree from 10, and can change as required, is the fixed ignition advance angle under state of starting operating, the influence of rotary speed unstabilization when avoiding being started is even still can reliably working under microprocessor breaks down situation.The utility model voltage adaptation wide ranges has fault indication function, can improve the heat load of engine power, reduction oil consumption, discharging and motor, can be used for the ignition system of all kinds motorcycle engine.

Fig. 1 is each constituent element schematic representation of the utility model.

Fig. 2 is for constituting a physical circuit of the present utility model.

Fig. 3 is the P87LPC767 singlechip chip schematic representation that the utility model adopted.

Further specify working procedure of the present utility model below in conjunction with accompanying drawing.

Sharp pulse from trigger winding 1 among Fig. 1 and Fig. 2 enters positive pulse shaping amplification amplitude limiter circuit 2 and negative impulse trigger circuit 4 respectively through the positive and negative sharp pulse of diode detection.The relative top dead center of negative impulse is 10 degree in advance, and the relative top dead center of positive pulse is 52 degree in advance.Amplify amplitude limiter circuit 2 positive pulse square waves through the positive pulse shaping and enter microprocessor analog comparator 3 reverse input ends, with the reference voltage of in-phase input end relatively after, in analog comparator 3 output terminals output high level or low level, insert the interrupting input end INTO of microprocessor again.Negative impulse produces positive triggering pulse and delivers to passage transfer relay 5 Chang Kaiduan A behind negative impulse trigger circuit 4, passage transfer relay 5 output terminal tie point ignition circuits 15 trigger electrodes.

First timer T0 in the microprocessor is used for the tacho-pulse counting, and second timer T1 is used for the ignition delay time counting.When the interrupting input end INTO of microprocessor means that positive triggering pulse arrives during for low level, CPU control stopping TO numeration is read counter value, and is restarted T0.CPU is according to the T0 counter value that has read, through calculating the digital quantity that just can obtain the tachometer value of motor.The voltage that characterizes load or accelerator open degree from displacement transducer connecting port 6 is connected on A/D converter 8 input ends of microprocessor behind low-pass filter circuit 7, loaded after the A/D conversion or the digital quantity of accelerator open degree.CPU is according to the load and the stepping value of rotating speed, inquires about a bidimensional form (MAP) that is stored among the microprocessor ROM and just can obtain optimum igniting advance angle under this load and this rotating speed.Calculate delay time, with the timing value of this delay time conversion T1 with respect to the output firing pulse of must delaying time after the positive triggering pulse arrival.

Bidimensional form (MAP) data that are stored among the microprocessor ROM are to obtain by a large amount of test result, are the optimum igniting advance angle of motor under various operating modes.The condition that the experiment of optimum igniting advance angle measures is that power maximum, the oil consumption of assurance motor is minimum, discharging is minimum and close on point of detonation.

CPU in the microprocessor is that rotating speed is controlled an I/O port level according to TO numerical value, and an I/O port channels in series switch driving circuit 9 is to passage transfer relay control end C.CPU is according to T1 numerical control the 2nd I/0 port level, and the 2nd I/O port series thyristor trigger circuit 10 are to passage transfer relay 5 normal-closed end B.

For guaranteeing that this igniter can make engine start reliably, the rotating speed that detects motor when microprocessor is lower than minimum starting speed or when stopping, control channel is switched, and directly controls the triggering of thyristor by negative impulse, at this moment is equal to and common CDI igniter.Therefore, starting under operating mode or the microprocessor failure conditions, igniter provides fixing ignition advance angle 10 degree.When the rotating speed that detects motor when microprocessor was higher than minimum idling speed, control channel was switched, and triggers thyristor by positive pulse through microprocessor control.When the T1 timing then sends the T1 interrupt requests, in T1 interrupt requests service routine, it is high level that CPU controls the 2nd I/O port, makes the thyristor conducting.Delay time 0.1 millisecond, putting this I/O line again is low level.

Two I/O ports of microprocessor are connected to two light emitting diodes respectively.Constitute failure indicating circuit 11.Just make the 2nd I/O port level negate during INTO interrupt service routine of the every execution of microprocessor.Therefore being connected on light emitting diode on this I/O port will one put out one bright.In case light emitting diode is normal bright when engine operation or often puts out, and not work of microprocessor then is described, ignition advance angle is the fixed ignition advance angle that negative impulse triggers.Be connected on the state of the light emitting diode indication passage on the I/O port, for the normal bright passage that then illustrates has switched to the fixed ignition advance angle state that negative impulse triggers, the explanation passage switches to microprocessor control optimum igniting advance angle state when often putting out when engine operation.If the rotating speed light emitting diode of change motor does not put out or do not work, illustrate that passage switches drive part and breaks down.

Take into full account interference protection measure on the software, on hardware, used the watchdog timer (WDT) in the single-chip microcomputer.The timing that WDT is set is 10 milliseconds, in case computer is subjected to external interference during program fleet, computer can automatically reset in time of 10 milliseconds being not more than, and program continues normal the execution.

For guaranteeing under battery malfunction or situation about opening circuit, the Rectified alternating current that the motorcycle rectifier provides still can make the microprocessor reliably working of this igniter, two-stage rectifying and voltage-stabilizing and eliminator have been taked, power connector end mouth 12 connects first order filter regulator circuit 13, adopt reference diode, second level mu balanced circuit 14 adopts integrated voltage stabilizing chip 78L05.

Fig. 3 is a singlechip chip P87LPC767 schematic representation, and configuration wherein all is not used in the utility model igniter.

Claims

1. a microprocessor is controlled ignition, comprise by electric capacity, the firing circuit that diode and thyristor are formed, firing circuit connects high-tension coil connecting port and charge coil connecting port, it is characterized in that: this ignition has the trigger winding connecting port, displacement transducer connecting port and power connector end mouth, amplify amplitude limiter circuit by microprocessor and positive pulse shaping, the negative impulse trigger circuit, the passage transfer relay, the passage switch driving circuit, thyristor gating circuit and low-pass filter circuit constitute the control circuit of described firing circuit

Described microprocessor comprises CPU, read-only memory under program, random memory, first timer, second timer, analog comparator, A/D converter, interrupting input end, an I/O port, the 2nd I/O port, the microprocessor each several part connects through Internal Bus, the trigger winding connecting port connects the positive pulse shaping respectively and amplifies amplitude limiter circuit and negative impulse trigger circuit, and the positive pulse shaping is amplified the amplitude limiter circuit output terminal and connected analog comparator inverting input, analog comparator in-phase input end connection reference voltage, analog comparator output terminal connection interrupting input end; Negative impulse trigger circuit connecting passage transfer relay Chang Kaiduan, passage transfer relay output terminal tie point ignition circuit thyristor trigger electrode, displacement transducer connecting port series connection low-pass filter circuit is to the A/D converter input end, first timer carries out the rotating speed numeration according to the interrupting input end signal, CPU is according to first timer numerical control the one I/O port level, the one I/O port channels in series switch driving circuit is to passage transfer relay control end, CPU inquires about a bidimensional form that stores in the read-only memory under program according to first timer numerical value and A/D converter numerical value, calculate the spark delay time value and deposit second timer in, CPU is according to second timer numerical control the 2nd I/O port level, and the 2nd I/O port series thyristor trigger circuit are to passage transfer relay normal-closed end.

2. microprocessor control ignition as claimed in claim 1 is characterized in that described microprocessor is a single-chip microcomputer, wherein also is equipped with watchdog timer, and a described I/O port and the 2nd I/O port are connected to light emitting diode respectively as indicating fault.

3. microprocessor control ignition as claimed in claim 1 or 2, it is characterized in that the power connector end mouth connects first order filter regulator circuit, the latter connects negative impulse trigger circuit, passage transfer relay, passage switch driving circuit, thyristor gating circuit and second level mu balanced circuit respectively, second level mu balanced circuit is exported as described power supply of microprocessor.