JPS58185938A - Torque fluctuation restraining device for engine - Google Patents

Abstract

PURPOSE:To maintain properly a battery charging amount by making an alternator generate electricity in increasing torque generated in a crankshaft to restrain torque fluctuation while controlling the generating amount of the alternator according to the condition of a battery. CONSTITUTION:Time of increasing torque generated in a crankshaft is detected by a timing detecting means 3 comprising a crank angle sensor 7 to supply current to a field core 1a of an alternator 1 through a field current controlling means 2 including a single multiplexer 9 in the time of increasing the torque for making the alternator 1 generate. Thus, reverse torque is generated in the crankshaft to restrain the fluctuation of rotational torque. When the discharging condition of a battery 5 is detected by a battery condition detecting means 12, a field current controlling means 12 is corrected by a correcting means 11 in the direction of increasing generation amount of the alternator 1 and in the direction of decreasing the generation amount when the over-charging condition is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The misfire relates to an engine torque fluctuation suppression device.

Generally, in an engine, the explosive force in the cylinder is converted into rotation of the crankshaft, so that when the crankshaft rotates, rotational torque fluctuations occur in the crankshaft in synchronization with the explosion. The rotational torque fluctuation generated in the crankshaft causes vibrations, rattling noises, etc., and has various harmful effects.

Conventionally, as shown in Japanese Unexamined Patent Application Publication No. 1986/1983, a first engine that rotates integrally with the engine crankshaft has been used to suppress fluctuations in the rotational torque of the crankshaft.
magnetic flux generating means and a second magnetic flux generating means on the fixed side are provided, and magnetic torque is generated in synchronization with rotational torque fluctuations generated in the crankshaft and in the opposite phase to the rotational torque fluctuations to suppress engine torque fluctuations. It is either a technique to suppress or fried rice.

However, in the rice lifting technique described above, it is necessary to separately form the first and second magnetic flux generating means in the conventional engine.
There is a problem in terms of cost.

Therefore, in view of this point, the first row of misfires includes a timing detection means for detecting when the torque increases due to rotational torque fluctuations generated on the crankshaft due to the explosion of the engine, and a torque detection means in response to a signal from the timing detection means. Field current control means is provided to apply a field current to the field coil of one ruternator when the torque increases, and a reverse torque is generated on the crankshaft when the torque increases, thereby suppressing rotational torque fluctuations generated on the crankshaft in synchronization with engine explosion. The existing alternator is used to suppress rotational torque fluctuations, effectively preventing vibrations, rattling noises, etc.
The field current control means is supplemented by a battery state detection means for detecting the discharge state of the battery, and a method for increasing the amount of power generated by the alternator when the battery is in the discharge state in response to a signal from the battery state detection means. It is an object of the present invention to provide a torque fluctuation suppressing device for an engine which includes a correction means and prevents a battery from becoming over-discharged to maintain a good state of charge at all times. An example of the misfire j will be described along the drawings.

<Embodiment/> In FIG. 1, 1 is an alternator equipped with a field coil 1a and a stator coil 1b, and a field current control means 2 is connected to the field coil 1d of the alternator 1. Further, a timing detection means 3 is connected to this field current control σ1l-J first stage 2 (the timing detection means 6 is connected to the rotational torque generated on the crankshaft (not shown) in synchronization with the explosion of the engine. The field current control means 2 receives a signal from the timing detection means 6 and applies a field current to the field coil 1d of the alternator 1 when the torque increases.

On the other hand, a battery 5 and an electric load 6 such as a lamp are connected to the stator coil 1b of the alternator 1 via a rectifier circuit 4.

The crank angle sensor 7 constituting the timing detecting means 6 outputs a detection signal when the valley cylinder bisto is at the -L dead center position, and the detection signal of the crank angle sensor 7 is sent to the waveform shaping circuit. 8, the signal is manually shaped into a rectangular wave.

The signal from the hand-shaped shaping circuit 8 is output to the monostable multi-high break 9 of the field current control means 2, and the monostable multi-high break 9 generates a signal having a predetermined pulse width corresponding to the time for applying the field current. This signal is amplified by the drive circuit 10 and applied to the field coil 1d of the alternator 1 at a predetermined timing.

The field current applied to the field coil 1d is applied when the torque increases due to rotational torque fluctuations generated at the crankshaft, and when this torque increases, the alternator 1 generates electricity. This system generates a reverse torque on the crankshaft to suppress fluctuations in rotational torque that occur on the crankshaft in synchronization with engine explosion.

That is, for example, in a cycle cylinder engine, the crankshaft undergoes two rotations (11#ffl), and therefore rotational torque fluctuations as shown in FIG. 3 occur.

On the other hand, the timing detection means 6 and the feel)'ff
The i-flow controller control means 2 applies a field current as shown in FIG. 3B to the field coil 1d of the alternator 1 when the rotational torque fluctuation occurring in the crankshaft increases, and by applying this field current, A load torque (reverse torque) as shown in Fig. 3 C is generated, and the combination of this load torque C and rotational torque A results in a crankshaft composite torque as shown in Fig. 3, and its fluctuation range. is suppressed to be small.

The monostable multivibrator 9 also includes a correction means 1.
1 is connected to the correcting means 11, and a battery state detecting means 12 is also connected to the correcting means 11. The battery state detection means 12 detects the discharge state and overcharge state of the battery 5, and the correction means 11 receives the signal from the battery state detection means 12 and detects when the battery 5 is in the discharge state. Direction for increasing the amount of power generated by the alternator 7,
Also, when battery 5 is overcharged, the alternator may fail.
This is to correct the field current control means 2 in the direction of decreasing the amount of power generation in the evening 1.

The detecting means 12 in the battery 1 detects a current change from both ends of a resistor 16 connected in series with the battery 5, amplifies it in a differential amplifier circuit 14, and obtains the amplified value Vl l
On the other hand, the set value Ve is added by an adder circuit 15, and the signal v2 of this adder circuit 15 is sent to the first/second comparator 16.1.
7 is output. Further, the battery voltage VS is inputted to the third comparator 18 .

The third comparator 16 compares the output v2 of the adder circuit 15 with the first reference #ivO, and obtains the first reference value V.

is set to prevent the battery 5 from becoming over-discharged (the battery goes dead) depending on the amount of battery 5, etc. When the voltage becomes lower than Vo, the comparator 16
A signal S] is output from. In other words, when vO and Ve are equal, the current i becomes negative and the first
There is an output S1 from the comparator 16. Note that Vo is vO≦V
It is set appropriately within the range of e.

The second comparator 17 compares the output v2 of the adder circuit 15 with a second reference value Vt, and this second reference value Vt is determined by the battery 5 due to overcharging in the actual operating condition. It is set so that the durability of the adder circuit 15 is not impaired. Output.

The third comparator 18 converts the battery voltage Vs to the third reference terminal V
Compared with B, this third reference voltage \/B is set to a value close to the reference voltage (/jV) of 1st battery 5, and is thicker than the battery voltage Vs or this value VB. At this time, a signal is output from the third comparator 18. In other words,
There is an output from the third comparator 18 when the battery 5 is almost fully charged.

The outputs of the second comparator 17 and the third comparator 18 are input to an AND circuit 19, and the output S2 of this AND circuit 19 is output, together with the output S1 of the first comparator 16, to the switching circuit 20 of the correction means 11. .

The first contact 20at of the switching circuit 20 is connected to the first correction circuit 21 that outputs a correction signal that increases the cross width, and the second contact 20b is connected to a correction signal 44 that outputs a correction signal that increases the cross width.
The second correction circuit 22 which outputs the signal is also connected, and the third
Contact point 20C is a neutral point.

-1: When the signal S1 is output from the first comparator 16, that is, when the /manoteri 5 is in the discharge state, the switching circuit 20 closes the first contact 20a and switches the monostable multivibrator. The correction signal of the first correction circuit 21 is input to 9, and the pulse width of the monostable multi-novel breaker 9 is corrected to increase, the field current application time is lengthened, and the amount of power generated is always constant. In addition, the switching circuit 20 increases the AND circuit 19.
When the signal S2 is output from the second and third comparators 17 and 18,
Even though the battery 5 is almost in a charged photon state and a sufficient potential is present at the positive terminal, when the amount of power generation is high and a large amount of current flows into the battery 5 side, in an overcharged state, the %22 contact 20 Close b to create a monostable Martino＼
inputting the second correction circuit 220 correction signal to the iblator 9;
The amount of power generated by the alternator 10 is reduced by correcting the noggle width of the monostable multivibrator 9 to shorten the field current application time.

Note that when no signal is output from the first comparator 16 and the AND circuit 19, that is, in a normal charging state, the switching circuit 20 is at the third contact 20C and changes the pulse width to the monostable multivibrator 9. Retain what is set.

<Example! 〉 In the previous example, the amount of power generated by the alternator 1 was corrected by increasing or decreasing the pulse width of the field current. The amount of power generated by the alternator 1 is corrected by increasing or decreasing the amount of power generated by the alternator 1.

The detection signal of the crank angle sensor 7 of the timing detection means 3 is shaped into a rectangular wave by the waveform shaping circuit 8 and is inputted to the monostable multivibrator 9 of the field current control means 2, which generates a predetermined pulse. After being converted into a signal having a width, the signal is input to an attenuation circuit 231.

No. 18 of the attenuation circuit 23 is amplified by the amplification circuit 24 at an amplification degree corresponding to the discharge state of the battery 5, and this signal is further amplified by the drive circuit 10 and sent to the field coil 1d of the alternator 1 at a predetermined timing. It is applied.

The amplification circuit 24 is connected to the amplification degree supplementary IF circuit 25 of the correction means 2B, and the amplification degree correction circuit 25 is connected to the battery state detection means 12 of the previous example and 1ri1.

When the battery 5 is in a discharged state and the signal S1 from the first comparator 16 is being output, the amplification compensation IF circuit 25 outputs a correction signal that increases the amplification degree of the amplifier circuit 24, and the field The amount of power generated by the alternator 1 is increased by increasing the peak value of the current.

Also, if the battery 5 is in the overcharged window, the AND circuit 19
When the id signal S2 is being output from the amplifier circuit 24, the amplification correction circuit 25 outputs a correction signal that reduces the amplification degree of the amplifier circuit 24, reduces the peak value of the field current, and reduces the power generation amount of the alternator 1. When the battery 5 is in a normal charging state, the amplification circuit 24 performs an amplification at an intermediate amplification rate.

Nafu・, real/lf! ! I.114 structures that are the same as 1+I11 are indicated with the same reference numerals.

The phrase "this invention is issued" is not limited to the disasters of the above-mentioned embodiments, but includes various modifications. That is, in both embodiments described in (g) and (g), the pulse width or peak value of the field current is corrected stepwise (in three steps), but it may be corrected steplessly. Also, implementation seconds/
And examples! Both the pulse width and the peak value may be corrected by combining the above.

Furthermore, in both embodiments, the field current is corrected when the battery 5 is discharged and overcharged, but in practical use, the amount of power generated by the alternator during discharging is adjusted blindly. It is sufficient to make the correction.

On the other hand, the timing detection means 6 may be one that detects the initiation pulse of the ignition circuit, in which case a delay circuit is provided to apply the field current at a time delayed by a predetermined amount from the ignition timing. There are a number of ways to do this.

As explained above, according to the present invention, by providing the timing detection means and the field current #it control means, as well as the battery state detection means and the correction means, the reverse torque is applied to the crankshaft when the torque increases. It is possible to suppress the rotational torque fluctuation that occurs on the crankshaft in synchronization with the engine explosion, and it is possible to improve the adverse effects such as camera noise and teeth rattling noise.Moreover, it can use existing alternators. This method has advantages in terms of cost, and at the same time increases the amount of power generated when the battery is in a discharged state to increase charging of the battery.
This can prevent the occurrence of insufficient charging.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the misfire 1 Liu, FIG. 2 is a schematic configuration diagram showing the embodiment, and FIGS. 3A to 3D are explanatory diagrams showing the torque fluctuation suppressing effect. 1... Alternator, 1d...°/° field coil, 1b... Stator coil, 2...
Field current control means, 6... Timing detection means, 5... Battery, 11.26...
Correction means, 12. Own battery state detection means, 20.
...Switching circuit, 25...Amplification correction circuit

Claims (1)

[Claims] (1) Timing detection means for detecting when torque increases due to rotational torque fluctuations occurring in the crankshaft in synchronization with engine explosion, and a field current applied to the field coil of the alternator when torque increases upon receiving a signal from the timing detection means. a field current control means for applying a field current; a battery state detection means for detecting a discharge state of the battery; and a field current control means for detecting a discharge state of the battery; and a correction means for correcting the current control means,
Nishijin's torque fluctuation suppression device is characterized in that it generates reverse torque on the crankshaft when torque increases, and suppresses rotational torque fluctuations generated on the crankshaft in synchronization with engine explosion.