CN1042457C - Contactless ignition device for internal combustion engine - Google Patents

Abstract

A timing sensor is formed by forming a protrusion on a rotor, and a contactless ignition device for an internal combustion engine used in a two-wheeled vehicle with a step advance at the time of starting is provided. Based on signals G1, G2 corresponding to the leading and trailing edges of the rotor protrusion, a G2 interruption time TG2 is calculated after a time TG1 of G1, and a time interval TG1G2 is calculated in step 206. If it is judged that the engine speed is less than N1, step 208 calculates the ignition time Ts, step 209 counts down the count set for time Ts, and if "0" indicates that P is not enough₀The end is "0" and ignition is performed. After the specific time has elapsed as confirmed in step 313, step 214 enables P₀The end is "0" to end the firing event.

Description

Contactless ignition device for internal combustion engines

The present invention relates to a non-contact ignition device for an internal combustion engine used in, for example, a two-wheeled vehicle with a stepwise advance angle at start.

In the recoil start type internal combustion engine, such control is performed in order to reduce the degree of recoil (recoil of the kick start pedal) generated when it starts; the ignition time at start is delayed compared with idling , which requires a so-called electronic advance angle ignition control device with grading, which is adopted for this purpose: for example, two protrusions are formed on the rotor that rotates integrally with the internal combustion engine, and a sensor is used to detect the passage of the protrusions.

However, if a sensor is composed of a rotor with two protrusions like this, it is necessary to form two protrusions at a specific interval with respect to the rotor, and since the positional accuracy of the two protrusions is required, it is necessary to forge the rotor protrusions. The complexity of the process will inevitably lead to its high price, and at the same time, the circuit structure will also be complicated, resulting in an increase in the size of the components. Furthermore, since the forged projections on the rotor must be changed when changing the step width, there is a problem that time and cost are required accordingly.

In this way, it is considered that one sensor is constituted by a rotor having one protrusion as shown in JP-A-59-23067. That is, the stepwise advance angle is from the trailing edge to the leading edge of one rotor. However, for this sensor structure, since the classification is determined by the sensor pulse width, the degree of freedom of setting is limited. Furthermore, since the peak of the output waveform from the sensor is set by the leading edge and the trailing edge of the protrusion at the number of revolutions at the start of ignition, especially at the time of starting, the step width becomes small, and there is little effect of preventing backlash.

SUMMARY OF THE INVENTION In view of the above disadvantages, it is an object of the present invention to provide a non-contact ignition device for an internal combustion engine with strong low-speed gradation in engine rotation fluctuations under the condition that a sensor is constituted by a rotor having a protrusion.

The non-contact ignition device for an internal combustion engine according to the present invention includes a rotor that has a protrusion that makes the timing sensor rotate synchronously with the rotation of the internal combustion engine, and the ignition device outputs a distance from the width of the protrusion at a specific rotational angle position every time the internal combustion engine makes one revolution. Corresponding first and second detection signals G1 and G2, and having an ignition control device, the ignition control device calculates the rotation speed of the above-mentioned internal combustion engine according to the time interval of the first detection signal G1 or the second detection signal G2, in the internal combustion engine When the rotation speed is lower than a specific low rotation speed, the ignition time timer at low rotation is set according to the time interval of the first and second detection signals G1 and G2, and the ignition switch device is controlled when the set ignition time passes, by The above-mentioned second detection signal position sets the above-mentioned ignition time timer.

On the non-contact ignition device of the internal combustion engine constituted in this way, there is an ignition device with low-speed classification that can be realized by one sensor corresponding to one protruding rotor. While the ignition control can be carried out effectively by a simple structure, it can be easily It can accurately realize the change of the grading width, and can fully determine its degree of freedom in setting, which can also play a greater role in preventing backlash.

Fig. 1 is a circuit structure diagram for illustrating a non-contact ignition device related to an embodiment of the present invention;

Fig. 2 illustrates the relationship between the number of revolutions of the internal combustion engine in the ignition device and the ignition time and the positional relationship of the output signals G1 and G2 from the timing sensor;

Fig. 3 (A) and (B) represent the corresponding P ₀ output state of the signal G1, G2 under the situation of N1 and N1-N2 of internal-combustion engine speed respectively;

Fig. 4 is a diagram showing an ignition control main routine of the ignition device;

Figure 5 is the interrupt program;

Fig. 6 is also a diagram of the G1 interrupt program;

Fig. 7 is a structural diagram illustrating another embodiment of the present invention.

An embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 1 shows its circuit configuration, which has a timing sensor 11 for detecting the rotation state of the internal combustion engine. One protrusion 11b having a predetermined width is formed on a rotor 11a that rotates integrally with the shaft of the internal combustion engine. Furthermore, an electromagnetic coil 11c is provided adjacent to the outer periphery of the rotor, and is configured to output a detection signal when opposed to a protrusion of the rotor that rotates together with the internal combustion engine. The electromagnetic coil 11c corresponds to the protrusion of the rotor, and outputs, for example, a first detection signal G1 in the negative direction when facing the front edge of the protrusion, and outputs a second detection signal G2 in the positive direction when facing the trailing edge of the protrusion.

A permanent magnet generator is provided in the internal combustion engine. The generator is provided with a generator coil 13 for charging the ignition capacitor 12, and the positive cycle electric energy emitted by the generator coil 13 is supplied to the capacitor 12 as charging electric energy through a circuit composed of diodes 14 and 15. The capacitor 12 forms a discharge circuit when the thyristor 16 is triggered, and supplies the discharged electric energy to the primary coil 171 of the ignition coil 17 . Accordingly, ignition power is supplied to the spark plug 18 connected to the secondary coil 172 of the ignition coil 17, and an ignition spark is generated.

The negative direction voltage from the generator coil 13 is supplied to the power supply circuit 19 of the ignition timing calculation circuit, and when the power to start the generator is turned on by the power supply circuit 19, a reset signal for initialization is generated to the microcomputer 20 .

The microcomputer 20 has output terminals P ₀ and P ₁ , and the output from the output terminal P ₀ is supplied to the base of the transistor 21 . Since the triode 21 is turned off when the output of the P ₀ terminal is "1" and is turned on when it is "0", a trigger signal is provided to the thyristor 16 when the triode 21 is turned on, and the capacitor 12 is discharged to perform ignition.

The output signal from the timing sensor 11 is supplied to the bases of the transistors 24 and 25 through diodes 22 and 23 which are forward-directed to the first and second detection signals G1 and G2, respectively. Accordingly, the transistor 24 is turned on in response to the first detection signal G1, and the input signal to the input terminal P3 of the microcomputer 20 is set to "0". Then, the transistor 25 is turned on in response to the second detection signal G2, and the input signal supplied to the input terminal P2 of the microcomputer 20 is set to "0". A "0" signal in the conduction state of the transistors 24 and 25 is supplied through an OR circuit 26 to an input terminal /IRQ (/ indicates negative logic) of the microcomputer 20, which generates an interrupt (insert).

The output signal from the output terminal _P1 of the microcomputer 20 is provided to the base of the transistor 27. When the output signal is "0", the transistor 27 is turned on, and when the transistor 27 is turned on, the transistor 28 is turned on. The transistor 28 is connected between the trigger control transistor 21 of the thyristor 16 and the input terminal _P2 of the microcomputer 20, and turns on/off the signal supplied to the transistor 21 by the transistor 25.

Fig. 2 is a diagram illustrating ignition timing characteristics. Since the number of revolutions of the internal combustion engine is divided into an extremely low-speed rotation state where the speed is lower than the number of idling revolutions, which is the first speed N1, and the region where the speed is higher than the number of idling revolutions, which is the second speed N2, is correspondingly given in the figure. Detection signals G1 and G2 from the timing sensor 11. Among them, A° is the angle between G1-G2 corresponding to the width of the protrusion 11b formed on the rotor, S° is the angle between the ignition timing and the G2 signal at the start, for example, at the position of G2 is BTDC (top dead center Pre-ignition time) 10°, when A° is set to 30°, G1 is BTDC 40°, and when S° is set to 10°, the starting ignition time becomes BTDC 0°.

In the ignition device constructed in this way, the internal combustion engine starts to rotate by depressing the kick starter pedal or the starter motor, and at this time, positive and negative AC voltages are generated in the generator coil 13 of the permanent magnet generator driven by the internal combustion engine. Accordingly, when a positive voltage is generated in the generator coil 13, a current flows in the circuit of the diode 14, the capacitor 12, and the diode 15, and the ignition capacitor 12 is charged. And when generator coil 13 produces negative direction voltage, ensure power supply by the power supply circuit 19 and diode 30 of circuit, simultaneously, provide reset signal to microcomputer 20 from power supply circuit 19, microcomputer 20 is initialized.

Thus, once the microcomputer 20 is reset, the main program shown in FIG. 4 starts to work. In step 101, the output terminals _P1 and _P0 of the microcomputer 20 respectively output "1", and the output of the output terminal _P1 turns off the transistor 27, thereby turning off the transistor 28. Accordingly, even if the G2 signal is generated in the timing sensor 11 to turn on the transistor 25, the ignition operation described later will not occur. Then, at step 102, various RAMs are initialized simultaneously with the initial setting of the _P0 terminal.

When a negative voltage is generated in the timing sensor 11, the transistor 24 is switched from the off state to the on state, and "0" is input to the terminals P3 and /IRQ for identifying interrupts. Once the /IRQ terminal is "0", the microcomputer 20 interrupts the progress of the main program, and at the same time, starts the interrupt program shown in FIG. 5 .

In this interrupt program, the level of the _P2 terminal is confirmed by step 201, and at the same time, when it is confirmed that the level of the _P2 terminal is "1", enter step 202 to confirm the level of the _P3 terminal. If it is confirmed in step 202 that the level of the _P3 terminal is "0", the G1 interrupt processing shown in FIG. 6 is performed.

In this G1 interrupt processing, first, in step 301, FSTEP is checked. The flag FSTEP indicates that the number of revolutions of the engine is above/under N1 revolutions. When it is judged by step 301 that the number of revolutions of the engine is below N1, proceed to step 302 and set the _P1 end to "1", and by step 303, measure the G1 interruption time TG1, and prepare for the 360° interval after the main program returns Calculation of time TIG1. Then, the G1 signal metering end flag is set in step 204, and the P ₀ terminal is initialized in step 305 and returns to the main program.

In the main program of Fig. 4, step 103 determines whether there is a G1 interruption, and if there is a G1 interruption, then enters step 104, and calculates one rotation of the rotor according to the time TG1 measured in this process and the time TG1 measured last time 360° rotation time TIG1. In this case, if the time TIG1 for 360° is calculated, the engine speed is calculated based on this, and it is determined in step 105 whether the engine speed calculated in this way is greater than or equal to N2. If it is judged that the number of revolutions is above N2, the calculation of the ignition time of Tθ (see FIG. 2 ) is performed in step 106 .

If a forward voltage is generated in the timing sensor 11, the triode 25 is controlled to be turned on. As soon as the triode 25 is turned on, the /IRQ and _P2 terminals of the microcomputer 20 are made to be "0" through the "or" circuit 26, thereby turning off the interrupt output. For the microcomputer 20, the interrupt routine shown in FIG. 5 is started. In this interrupt program, since the level of the _P2 terminal is determined as " _P = 0" in step 201, the measurement of TG2 as the G2 interrupt time is carried out in step 203, and it is determined in step 204 whether to perform the measurement before this. TG1 metered. At this time, since the measurement of TG1 has already been completed, the process proceeds to step 205 .

In step 205, the set TG1 gauge flag is cleared, and in the next step 206, time TIG1G2 corresponding to the protrusion width A° of the timer rotor is calculated from "TG2-TG1". In step 207, according to the TG1G2 obtained in this way, it is judged whether the current internal combustion engine speed is above N1, and when it is judged to be below N1, enter step 208, calculate the ignition time Ts used for the ignition time before the classification from the current TIG1G2, and set ignition time.

If the ignition time is set in this way, the time Ts is counted down by step 209, and if the count value is determined to be "0" in step 210, the process goes to step 211.

In step 211, the output of the _P0 terminal of the microcomputer 20 is set to "0", thereby turning on the triode 21, and providing a trigger signal to the thyristor 16 to make it turn on. Once the thyristor 16 is turned on, the charge of the ignition capacitor 12 is discharged by the ignition coil 17, generating a high voltage on its secondary side for ignition by the spark plug.

Thereafter, in step 212, the flag FSTEP is initialized to "0", and in step 213, after a certain period of time (for example, 100 μ seconds) is confirmed, in step 214, the P ₀ terminal is made to be "1" to turn off the transistor 21, thereby The trigger signal to the thyristor 16 is ended. In this way, ignition is performed at a period lagging behind the signal G2 by the timing time Ts. This prevents backlash from occurring at the time of starting when the number of revolutions is less than or equal to N1.

When the number of revolutions of the internal combustion engine rises above N1 revolutions, the flag FSTEP is set to "1" in step 215 based on the judgment in step 207 of the interrupt routine of FIG. 5 . Thereafter, if an interruption of the G1 signal occurs, "0" is output at the P1 terminal in step 306 based on the judgment output in step 301 in FIG. 6 . Transistor 27 is turned on by the output of the P1 terminal, and since triode 28 is turned on, the next G2 signal from timing sensor 11 is used for pure circuit ignition without using the output information from microcomputer 20 .

Once the rotation of the internal combustion engine has further increased from idling to over N2, this state is detected by step 307, and in step 308, the ignition time Tθ calculated in the G1 interrupt routine is set and counted down , In step 309, when the ignition time Tθ is "0", the P0 terminal is set to "0" by step 310 to repeat the ignition action.

(A) of Fig. 3 represents the state corresponding to the G1 and G2 signals of the timing sensor 11 at the P ₀ and P ₁ ends of the microcomputer 20 when the number of revolutions of the internal combustion engine is "0-N1", in this state, the P ₁ end is always "1", the timing Ts after the G2 signal makes the P ₀ terminal "0" to perform the ignition action.

(B) represents the state corresponding to the P ₀ end of the signal G1 and G2 under the situation that the number of revolutions of the internal combustion engine is N1-N2, corresponding to the signal G2 of the timing sensor, the P0 end is "0", and the P ₁ end is always set at this time Set to "0".

Although in the embodiment, the ignition generated by the signal G2 is formed by turning on and off the triode 28, it is not necessary to use such a structure, but adopt a software method based on the output from the _P0 terminal of the microcomputer 20. Ignition form, so just can not be produced by the hardware mode ignition form of the G2 signal when the reset of microcomputer 20.

The power supply for the circuit may be constituted by a battery, not a magnetic-capacitor discharge ignition device (CDI) but a DC-CDI and a triode ignition, etc. are also possible. Moreover, the "OR" circuit and the _P2 and _P3 terminals shown in FIG. 7 can also be abolished by using a microcomputer with an independent interrupt (insert) terminal. In addition, the output signals G1 and G2 from the timing sensor 11 can also be obtained as outputs from the comparison circuit. Furthermore, the rotational speed may be obtained from the time interval of either one of the output signals G1 and G2 from the timing sensor 11 . Although a microcomputer is used in the above embodiments, it is also possible to configure an arithmetic circuit by combining it with a comparator or the like. Moreover, the protrusion provided on the shaft can also be a depression, and the notch of the crank arm can also be utilized.

According to the above-mentioned non-contact ignition device for an internal combustion engine of the present invention, in the case where a sensor is formed by a rotor having a protrusion, the staged advance ignition time at startup is calculated and set according to the rotor protrusion width time data, so that during the rotation fluctuation of the internal combustion engine Contactless ignition control with strong low-speed staging is performed.

Claims (10)

1. internal-combustion engine contactless ignition mechanism, comprising:

The solid of rotation (11a) that rotates with internal-combustion engine;

Be located on this solid of rotation, have with the corresponding leading edge in full aduance position and with the characteristic (11b) of corresponding trailing edge firing time in when idle running.

Detect above-mentioned characteristic, produce the 1st testing signal (G1), produce the sensor (11c) of the 2nd testing signal (G2) at above-mentioned trailing edge in above-mentioned leading edge;

Examine signal (G2) then according to above-mentioned the 1st testing signal (G1) and the 2nd and obtain speed detector with the corresponding signal of above-mentioned internal-combustion engine rotational speed;

The advance angle control gear of the advance angle position generation fire signal when the 1st rotating speed of setting greater than the preliminary election of expression during above-mentioned engine starting by the resulting rotating speed of this speed detector (N1) above-mentioned the 2nd testing signal (G2) before;

The firing circuit that responds above-mentioned fire signal and carry out the igniting action of internal-combustion engine,

It is characterized in that: igniting time-setting mechanism when also comprising low speed rotation, by the resulting rotating speed of above-mentioned speed detector during less than predefined the 1st rotating speed (N1) of expression during above-mentioned engine starting, measure above-mentioned the 1st testing signal (G1) and the above-mentioned the 2nd and examine the then generation blanking time (TIG1G2) of signal (G2), the timing (Ts) of firing time when setting the expression low speed rotation according to this time (TIG1G2), from above-mentioned the 2nd testing signal (G2) at the fire signal that produces the fire signal that replacement produced by above-mentioned advance angle control gear through above-mentioned timing (Ts) afterwards;

Above-mentioned timing (Ts) is set like this: produce fire signal in above-mentioned the 2nd testing signal (G2) predetermined angular position (S °) afterwards according to the above-mentioned time (TIG1G2);

Above-mentioned timing (Ts) is set by following equation:

Firing time during wherein low speed rotation the predetermined angular position (S °) after as above-mentioned the 2nd testing signal (G2), the angle intervals between above-mentioned the 1st testing signal (G1) and above-mentioned the 2nd testing signal (G2) as angle intervals (A °).

2. ignition mechanism according to claim 1 is characterized in that: what above-mentioned speed detector measured in above-mentioned the 1st testing signal (G1) or above-mentioned the 2nd testing signal (G2) any repeats to produce blanking time (TIG1).

3. ignition mechanism according to claim 1 is characterized in that: above-mentioned characteristic (11b) is arranged on projection or the recess on the above-mentioned solid of rotation, is used to make the interval of above-mentioned solid of rotation and the sensor to change.

4. according to any described ignition mechanism in the claim 1 to 3, it is characterized in that above-mentioned advance angle control gear comprises:

Igniting time-setting mechanism when when the 2nd rotating speed (N2) set greater than the 1st rotating speed (N1) and less than the preliminary election of expression more than the above-mentioned idling of IC engine revolution by the resulting rotating speed of above-mentioned speed detector, responding the idle running that above-mentioned the 2nd testing signal (G2) produces fire signal;

By the resulting rotating speed of above-mentioned speed detector during greater than predefined 2nd rotating speed (N2) of expression more than the above-mentioned idling of IC engine revolution according to above-mentioned the 1st detection signal (G1) or above-mentioned the 2nd detection signal (G2) in any generation interlude (TIG1) duration of ignition when setting the expression High Rotation Speed timing (T θ), when producing the High Rotation Speed of ignition signal from above-mentioned the 1st detection signal (G1) afterwards through above-mentioned timing (T θ) the igniting time-setting mechanism.

5. ignition mechanism according to claim 4, the igniting time-setting mechanism comprises when it is characterized in that above-mentioned low speed rotation: when the invalid ineffective treatment device of fire signal that above-mentioned advance angle control gear is produced during predefined the 1st rotating speed (N1) during less than the above-mentioned engine starting of expression by the resulting rotating speed of above-mentioned speed detector.

6. ignition mechanism according to claim 5, it is characterized in that: the igniting time-setting mechanism comprises response above-mentioned the 2nd testing signal (G2) and produces the transistor circuit of fire signal during above-mentioned idle running, thereby above-mentioned ineffective treatment device makes above-mentioned transistor circuit remain on that predetermined state stops response above-mentioned the 2nd testing signal (G2) and the fire signal that produces.

7. internal-combustion engine contactless ignition mechanism, comprising:

The solid of rotation (11a) that rotates with internal-combustion engine;

Be arranged on this solid of rotation, have with the corresponding leading edge in full aduance position and with the characteristic (11b) of corresponding trailing edge firing time in when idle running;

Detect above-mentioned characteristic, produce the 1st testing signal (G1), produce the sensor (11c) of the 2nd testing signal (G2) at above-mentioned trailing edge in above-mentioned leading edge.

Obtain speed detector with the corresponding signal of above-mentioned internal-combustion engine rotational speed according to above-mentioned the 1st testing signal (G1) and above-mentioned the 2nd testing signal (G2);

When by the resulting rotating speed of this speed detector during greater than predefined 1st rotating speed (N1) of expression during above-mentioned engine starting by the advance angle control gear of above-mentioned the 1st testing signal (G1) as the advance angle position generation fire signal of time measurement before above-mentioned the 2nd testing signal (G2) of benchmark;

The firing circuit that responds above-mentioned fire signal and carry out the internal-combustion engine ignition action,

It is characterized in that: igniting time-setting mechanism when also comprising low speed rotation, when by the resulting rotating speed of above-mentioned speed detector during less than predefined the 1st rotating speed (N1) of expression during above-mentioned engine starting, by measuring above-mentioned the 1st testing signal (G1) or above-mentioned the 2nd testing signal (G2) time lag separately, by above-mentioned the 2nd testing signal (G2) the lag position after deciding angle, replace above-mentioned advance angle control gear to produce fire signal.

8. ignition mechanism according to claim 7, it is characterized in that: igniting time-setting mechanism during above-mentioned low speed rotation, by time measurement the lag position generation fire signal by above-mentioned 2nd testing signal (G2) definite angle after of above-mentioned the 2nd testing signal (G2) as benchmark.

9. ignition mechanism according to claim 7 is characterized in that: during above-mentioned low speed rotation the igniting time-setting mechanism make from the fire signal of above-mentioned advance angle control gear invalid.

10. ignition mechanism according to claim 8, it is characterized in that, above-mentioned advance angle control gear is higher than above-mentioned the 1st rotating speed (N1) and is higher than preliminary election when setting than the 2nd rotating speed (N2) of idling of IC engine revolution at the rotating speed that is recorded by above-mentioned speed detector, by above-mentioned the 1st testing signal (G1) is produced the 1st ignition mechanism as the time measurement of benchmark; And at the rotating speed that records by above-mentioned speed detector during, respond above-mentioned the 2nd testing signal (G2) and produce the 2nd fire signal greater than above-mentioned the 1st rotating speed (N1) and less than above-mentioned the 2nd rotating speed (N2).

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