JPH0826840B2 - Ignition timing control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ignition timing control device that changes an ignition timing of an engine in accordance with a throttle opening.

[Conventional technology]

Conventionally, in an ignition timing control device that changes the ignition timing of an engine according to the throttle opening, as shown in FIG. 6, the ignition timing control is performed in proportion to the change rate of the throttle opening. That is, when the throttle opening changes from closed to open as shown in FIG. 6 (a), the ignition timing is advanced as shown in FIG. 6 (b), and when it changes from open to closed, it is proportional to the rate of change. Then, the ignition timing is retarded.

[Problems to be Solved by the Invention]

However, for example, in the case of sudden deceleration, for example, in a marine vessel, the forward operation state may be switched to the reverse operation state and the screw may be reversely rotated to obtain a braking action. Therefore, in such a case, the engine is suddenly loaded because the screw shaft is in the reverse drive state while the boat is in the forward drive state.
However, at the time of this switching, the throttle opening of the normal engine is at the fully closed position and the ignition timing is at the most retarded position. Therefore, there is a problem that the engine is easily stalled due to a sudden load change.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an ignition timing control device capable of preventing an engine stall state such as during rapid deceleration of a ship.

[Means for solving the problem]

The ignition timing control device according to the present invention gently reflects a change in the throttle opening signal value when the throttle opening is shifted to the closing side, and is throttled when the throttle opening is shifted to the opening side. Based on the relaxation retardation means for promptly reflecting the change in the opening degree signal value and the output signal of the relaxation retardation means and the first reference signal of the reference signal output means, the throttle opening degree is shifted to the closing side. Accordingly, the ignition timing is shifted to the retard side,
Further, the ignition timing calculation means for calculating the ignition timing so as to shift the ignition timing to the advance side as the throttle opening shifts to the open side, and the output signal of the ignition timing calculation means are output for a predetermined period after the engine is started. Is invalidated, and selection means for selecting an ignition timing signal based on the second reference signal of the reference signal output means is provided.

Further, the relaxation retarding means has an integrating means configured to have different time constants when the throttle opening is shifted to the closing side and when the throttle opening is shifted to the closing side. It is a thing.

Further, the relaxation retarding means is provided with a compensating means for accelerating the integration so that the value of the integrating means quickly becomes a value corresponding to the throttle opening when the engine is started.

[Work]

In the present invention, the first and second reference signals are output, and the ignition timing calculation means calculates the ignition timing based on the first reference signal and the output signal of the relaxation retardation means.

Specifically, when the throttle opening is changed from the closed side to the open side, the output voltage of the relaxation retardation means quickly becomes a value according to the throttle opening, and the ignition timing follows the change quickly. Advance to. Further, when the throttle opening is changed from the open side to the closed side, the output voltage of the relaxation retarding means is gently changed by the integrating means, so the ignition timing follows the change and is gradually retarded. Move to.

Further, during a predetermined period after the engine is started, the ignition timing signal calculated based on the first reference signal and the output signal of the relaxation retarding means as described above is invalidated, and the ignition based on the second reference signal is performed. Select as a timing signal.

Further, when the engine is started, the output signal of the relaxation retarding means is promptly set to a value corresponding to the throttle opening.

〔Example〕

FIG. 1 is a circuit diagram of an ignition timing control device according to an embodiment of the present invention. In the figure, 1 is a magneto coil of a magneto generator driven by an engine (not shown), one end of which is connected to an ignition capacitor 3 via a diode 2,
The other end is grounded. Reference numeral 4 is a thyristor for discharging the charged electric charge of the capacitor 3 to the ignition coil 5, 6, 7 are primary and secondary coils of the ignition coil 5, 8 is an ignition plug connected to the secondary coil 7 side, and 9 is Primary coil 6
A counter electromotive force absorbing diode of the ignition coil 5 connected in parallel with the reference numeral 10 is a bias resistor connected between the gate and the cathode of the thyristor 4.

Further, 11 is a power supply circuit, which is a diode 1 connected in series.
2, the resistor 13 and the Zener diode 14 are connected between one end of the magneto coil 1 and the ground, the capacitor 15 is connected in parallel with the Zener diode 14, and the connection point between the Zener diode 14 and the resistor 13 is the output end. ing.

Reference numeral 16 is a signal coil that generates an ignition signal in synchronization with the rotation of the engine. One end of the signal coil is connected to the gate of the thyristor 4 via a diode 17 and a resistor 18, and also via a diode 19 and a resistor 20 connected in the reverse direction. Grounded and the other end grounded. Reference numeral 21 is an ignition timing calculation circuit for inputting an output signal of the signal coil 16 and an output signal of a relaxation delay circuit 32 described later, and calculating an ignition timing based on these signals, the output of which is connected to the gate of the thyristor 4. Has been done. That is, the connection point between the diode 19 and the resistor 20 is a resistor.
22 and the base of the transistor 23, and the other end of the resistor 22 is connected to the power supply. The collector of the transistor 23 is connected to the power supply via the resistor 24, is connected to the set terminal of the flip-flop 25, and the emitter is grounded. The Q output terminal of the flip-flop 25 is connected to the (−) input terminal of the operational amplifier 27 via the resistor 26, and the capacitor 28 is connected between the (−) input terminal and the output terminal of the operational amplifier 27. Also op amp 27
The output of the relaxation retardation circuit 32 is connected to the (+) input terminal of, the output terminal is connected to the (-) input terminal of the comparator 29, and the (+) input terminal of the comparator 29 is connected to the power supply. Has been done. The output terminal of the comparator 29 is connected to the gate of the thyristor 4 via the capacitor 30 and the flip-flop 25.
It is connected to the reset terminal of.

31 is a throttle sensor that detects the throttle opening,
When the throttle is driven to the closed side A, the output voltage becomes high, and when the throttle is driven to the open side B, the output voltage becomes low.

The relaxation delay circuit 32 is composed of an integrating circuit including a resistor 33 and a capacitor 34, and a diode 35 is connected in parallel to the resistor 33 so that its cathode side is the output side of the throttle sensor 31.

Next, the operation will be described. The power generation output of the power generation coil 1 is rectified by the diode 2 and charges the capacitor 3. Further, the signal coil 16 generates an ignition signal in synchronization with the rotation of the engine, and its positive wave is directly applied to the gate of the thyristor 4 by the diode 17 and becomes a reference signal (second reference signal) for setting the ignition timing. The negative wave is input to the ignition timing calculation circuit 21 and serves as a reference signal (first reference signal) for calculating the ignition timing of the engine. When the ignition signal is input to the ignition timing calculation circuit 21, the transistor 23 is turned off and the flip-flop 25 is set.
25 Q output terminal → resistor 26 → capacitor 28 → operational amplifier 27
The discharge current of the capacitor 28 begins to flow through the route of the output terminal of the, and eventually the output voltage of the operational amplifier 27 becomes (+) of the comparator 29.
When it becomes lower than the reference voltage V ₁ applied to the input terminal,
A signal of "0" → "1" appears at the output terminal of the comparator 29, which is differentiated by the capacitor 30 and applied to the gate of the thyristor 4 as an ignition timing control signal. Further, the flip-flop 25 is reset, the Q output terminal is inverted from "1" to "0", the discharge current of the capacitor 28 is cut off, and this time, the output terminal of the operational amplifier 27 → capacitor 28 → resistor 36 → flip-flop. The charging current of the capacitor 28 begins to flow at the Q output terminal of 25. The output of the comparator 29 which has become "1" becomes "1" → "0" here because the output voltage of the operational amplifier 27 again exceeds the reference voltage due to the charging current. This charging current continues until the next ignition signal is input to the ignition timing calculation circuit 21.

Here, the rotation angle θ of the engine from the input of the ignition signal to the ignition timing calculation circuit 21 to the output of the ignition timing control signal is expressed as a linear function of the output voltage V ₂ of the relaxation delay circuit 32. That is, when V ₂ increases, the ignition timing control signal shifts to the retard side, and the ignition timing control signal that advances as V ₂ decreases is output. Then, the ignition timing control signal or the ignition signal of the signal coil 16 causes the thyristor 4 to conduct, and the charge stored in the capacitor 3 flows into the primary coil 6 of the ignition coil 5 to generate a high voltage in the secondary coil 7, which causes a predetermined voltage. A spark is fired at the ignition plug 8 at the ignition timing.

The output voltage V ₂ of the relaxation retardation circuit 32 changes corresponding to the output of the throttle sensor 31, but the rate of change of the output voltage with respect to the change is different depending on whether the throttle is open to closed or closed to open. That is, when the throttle changes from the closed side A to the open side B, the output voltage of the throttle sensor 31 decreases,
The charge charged in the capacitor 34 flows through the diode 35,
The output voltage V ₂ drops quickly. However, when the throttle changes from the open side B to the closed side A, the voltage change of the throttle sensor 31 is integrated, and the voltage gradually rises according to the time constant determined by the resistance and the capacitance of the integrating circuit. Therefore, when the throttle opening changes as shown in FIG. 2 (a), the ignition timing follows the change of the throttle opening on the advance side as shown in FIG. 2 (b), but gradually on the retard side. Changes to.

Therefore, when a sudden operation is performed from the forward drive state to the reverse drive state in the marine vessel engine, the throttle is fully closed when switching from the neutral position to the reverse drive position, but the ignition timing has advanced from the most retarded position. In position. Therefore, in this state, the engine is switched to the reverse drive state, so that the engine does not become unstable even when a sudden load is applied to the engine, and engine stalling at the time of switching is prevented.

FIG. 3 is a circuit diagram showing the second embodiment. In this embodiment, the timer circuit 36 shown in FIG. 4 is provided between the ignition timing calculation circuit 21 and the gate of the thyristor 4. That is, the output terminal of the comparator 29 is connected to the first input end of the AND circuit 37, and the second input end of the AND circuit 37 is connected to the connection point between the resistor 38 and the capacitor 39 which are connected in series between the power supply and ground. Has been done. The output terminal of the AND circuit 37 is connected to the gate of the thyristor 4 via the capacitor 30.
Further, since the other respective configurations are the same as those in the above-described embodiment, the corresponding portions are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation of the ignition timing control device having the above configuration will be described. When the engine is started, the throttle is closed and the output of the throttle sensor 31 is at high potential. However, since the capacitor 34 of the relaxation retardation circuit 32 is in a discharged state, the output voltage V ₂ is substantially zero potential.
Since 34 is charged via the resistor 33, the output voltage V ₂ gradually rises. That is, even if the throttle is in the fully closed position, the output voltage V ₂
Does not reach the voltage corresponding to the fully closed position, and the throttle open side signal is sent. Therefore, the ignition timing calculation circuit
21 sends out an advanced ignition timing control signal.

Ignition timing at the time of engine start is usually a retarded position,
If this is not the case, there will be a problem that the rotation of the crankshaft or after starting will be unstable. Therefore, in this embodiment, the timer circuit 36 invalidates the output of the ignition timing calculation circuit 21 for a predetermined time from the engine start regardless of the throttle opening,
The positive wave of the signal coil 16, that is, the second reference signal is used for ignition. That is, since the second input end of the AND circuit 37 is at the low level for a predetermined time after the power is turned on by starting the engine, this signal is not output even if the advanced ignition timing control signal is input to the first input end. The timer time is set to about 2 to 5 seconds by the values of the resistor 38 and the capacitor 39, and thereafter, the normal ignition timing control is performed by the output signal of the ignition timing calculation circuit 21.

FIG. 5 is a circuit diagram showing a third embodiment including a compensating circuit 40 for increasing the output voltage V ₂ of the relaxation retardation circuit 32 to a predetermined value for a predetermined time after the engine is started. In the figure, reference numeral 41 denotes a comparator, the (-) input terminal of which is connected to the connection point of the resistor 42 and the capacitor 43, and the (+) input terminal of which is connected to the connection point of the resistors 44 and 45. The capacitor 43 and the resistor 44 and the resistor 45 are connected to the power supply. Also, the comparator
The output terminal of 41 is connected to the output terminal of the relaxation retardation circuit 32 via a diode 46, and the other configurations are the same as those in FIG.

In the ignition timing control device configured as described above, when the engine is started, the output of the throttle sensor 31 is at a high potential as described above, but the capacitor 34 of the relaxation retardation circuit 32 is provided.
Is in a discharge state, the output voltage V ₂ is substantially zero potential. However, in the compensating circuit 40, the voltage divided by the resistors 44 and 45 is applied to the (+) input terminal of the comparator 41 when the engine is turned on, and the capacitor 43 is connected to the resistor 42 at the (-) input terminal. Since the battery is charged with a time constant consisting of the value of the capacitor 43 and the value of the capacitor 43, the voltage is lower than the potential of the (+) input terminal for a predetermined time determined by this time constant, here 1 second or less. Therefore, the output of the comparator 41 becomes high level, and since this voltage is applied to the output end of the relaxation retardation circuit 32, its output voltage V ₂ immediately rises, and the ignition timing calculation circuit 21 controls the ignition timing at the retard position. Sends a signal to prevent over-advancement when starting the engine. After that, the voltage of the (−) input terminal of the comparator 41 becomes higher than that of the (+) input terminal and the output terminal becomes low level, and the voltage of the relaxation retardation circuit 32 is blocked by the diode 46, and thereafter the first Ignition timing control similar to that of the above embodiment is performed. Further, in this embodiment, since the normal ignition timing control is performed in a relatively short time, the followability of the throttle after the engine is started becomes good.

〔The invention's effect〕

As described above, according to the present invention, according to the throttle opening, the ignition timing is shifted to the retard side as the throttle opening is shifted to the closed side, and the throttle opening is shifted to the open side. In the ignition timing control device in which the ignition timing is controlled so as to shift the ignition timing to the advanced side in accordance with the above, if the throttle opening is suddenly changed from the open side to the closed side by providing the relaxation retarding means. Since the ignition timing is gradually shifted to the retard angle side from the change, the engine stall that occurs when the marine engine is switched to the reverse operation state can be prevented.

Further, in the case where the timer means is provided, ignition at an excessively advanced ignition timing at the time of starting the engine is also prevented, and the engine is stably started.

Further, in the case where the compensator is provided, there is an effect that the engine can be stably started and the followability of the throttle after the start is good.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an ignition timing control device according to a first embodiment of the present invention, FIG. 2 is a diagram showing a relationship of ignition timing with respect to a throttle opening of the ignition timing control device, and FIG. 3 is a second diagram. FIG. 4 is a circuit diagram of an ignition timing control device according to an embodiment, FIG. 4 is a circuit diagram of a timer circuit according to the same embodiment, FIG. 5 is a circuit diagram of an ignition timing control device according to a third embodiment, and FIG. 6 is conventional ignition. It is a figure which shows the relationship of the ignition timing with respect to the throttle opening of a timing control apparatus. 16 ... Signal coil, 21 ... Ignition timing calculation circuit, 31 ... Throttle sensor, 32 ... Relaxation delay circuit, 33 ... Resistance, 34
...... Capacitor, 35 ...... Diode, 36 ...... Timer circuit, 40 ...... Compensation circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] Claim: What is claimed is: 1. A throttle opening detecting means for outputting a signal according to a throttle opening;
Reference signal output means for outputting the second reference signal, and when the throttle opening is shifted to the closing side, the change of the throttle opening signal value is gently reflected, and the throttle opening is shifted to the opening side. At this time, based on the relaxation retarding means for promptly reflecting the change in the throttle opening signal value, the output signal of the relaxation retarding means and the first reference signal of the reference signal output means,
The ignition timing is shifted to the retard side as the throttle opening is shifted to the closed side, and the ignition timing is shifted to the advanced side as the throttle opening is shifted to the open side. And an selecting means for selecting an ignition timing signal based on the second reference signal of the reference signal outputting means, invalidating the output signal of the ignition timing calculating means for a predetermined period after the engine is started. An ignition timing control device comprising: 2. The integration retarding means is configured to exhibit different time constants when the throttle opening is shifted to the open side and when the throttle opening is shifted to the close side. The ignition timing control device according to claim 1, further comprising means. 3. The relaxation retarding means is provided with a compensating means for accelerating the integration so that the value of the integrating means quickly becomes a value corresponding to the throttle opening when the engine is started. The ignition timing control device described.