JPS58211541A - Inhibitor for variation of torque of engine - Google Patents

Abstract

PURPOSE:To inhibit the variation of torque while discharging a battery effectively at the overcharge of the battery, and to prevent overcharge by generating counter torque to a crankshaft when torque generated in the crankshaft is increased synchronized with the combustion of the engine. CONSTITUTION:The device is provided with a timing detecting means 3 containing a crank angle sensor 7, and field currents are conducted through the field coil 1a of an alternator 1 by a field-current control means 2 when the case of the torque increase of revolving-torque variation generated in the crankshaft while being synchronized with the combustion of the engine is detected by the means 3. Accordingly, counter torque is generated in the alternator 1. The device is provided with a battery-state detecting means 11 containing first and second comparators 16, 17 detecting the state of overcharge of the battery 5, the switch 12a of a conduction means 12 is turned ON when the battery is brought to the state of overcharge, a heat-wave heater (electric load) 6a is conducted and the quantity of discharge is increased, and overcharge is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine torque fluctuation suppressing device.

Generally, in an engine, explosive force within a cylinder is converted into rotation of a crankshaft, and therefore, while the crankshaft rotates, rotational torque fluctuations occur in the crankshaft in synchronization with the explosion. The rotational torque fluctuations generated in the crank and the shaft cause vibrations, rattling noises, etc., and have various types of noise.

Conventionally, JP-A-Sho! has been used to suppress fluctuations in rotational torque of the crankshaft. As shown in Publication No. 3-/G3/, a first magnetic flux generating means that rotates integrally with the crankshaft of the engine and a second magnetic flux generating means on the fixed side are provided to generate the magnetic flux on the crankshaft. A technique has been proposed for suppressing engine torque fluctuations by generating magnetic torque in phase opposite to the rotational torque fluctuations in synchronization with the rotational torque fluctuations.

However, in the proposed technique, the seventh and second magnetic flux generating means must be separately formed in the conventional engine.
There is a problem in terms of cost.

Therefore, the present invention provides timing detection means for detecting when torque increases due to rotational torque fluctuations generated on the crankshaft in synchronization with engine explosion, and a timing detection means for detecting when the torque increases due to rotational torque fluctuations occurring in the crankshaft in synchronization with engine explosion. A field current control means for applying a field current force η to the field coil is provided to generate a reverse torque on the crankshaft when the torque increases, and to suppress rotational torque fluctuations generated on the crankshaft in synchronization with engine explosion. By using the existing alternator, rotational torque fluctuations are completely suppressed.
In order to effectively prevent vibrations, rattling noises, etc., there is a battery condition detecting means that detects all overcharged states of the battery, and a signal tube of the battery condition detecting means that detects when the battery is in an overcharged state by using a hot wire heater, etc. An energizing means that completely energizes the electrical load! ! It is an object of the present invention to provide a torque fluctuation suppressing device for an engine which prevents a battery from becoming overcharged and maintains a good state of battery charge at all times.

Embodiments of the present invention will be described below with reference to the drawings.
In the figure, 1 is a field coil 1a and a steering wheel, the field coil 1a of the alternator 1 is connected to a field current control means 2, and the field current control means 2 is connected to a timing detection means 3. . The timing detecting means 3 detects when the torque increases due to rotational torque fluctuations occurring in the crankshaft (not shown) in synchronization with engine explosion, and the timing detecting means 3 detects when the torque increases due to rotational torque fluctuations occurring in the crankshaft (not shown) in synchronization with the engine explosion. Therefore, it is a concern that a field current is applied to the field coil 1a of the alternator 1 when the torque increases.

On the other hand, a battery 5, an electric load 6 such as a lamp, etc. are connected to the stator coil 1b of the alternator 1 via a rectifier circuit 4'.
A hot wire heater 6a (electric load) for removing the rear window is connected.

The crank angle sensor 7 constituting the timing detecting means 5 outputs a full detection signal when the piston of each cylinder is at a position delayed by a predetermined angle from the top dead center position. The signal ``is inputted to the waveform shaping circuit 8 and shaped into a rectangular wave.

The signal of the waveform shaping circuit 8 is output to the monostable multivibrator 9 of the field current control means 2, and is made into a signal having a predetermined pulse width corresponding to the time during which the entire field current is applied by this monostable multivibrator 9. is amplified by the drive circuit 10 and applied to the field coil 1a of the alternator 1 at a predetermined timing.

The field current applied to the field coil 1a is applied when the torque increases due to rotational torque fluctuations occurring in the crankshaft, and when this torque increases, the alternator 1 generates electricity, causing the crankshaft to reverse. It generates torque and suppresses rotational torque fluctuations that occur on the crankshaft in synchronization with engine explosion.

That is, for example, in a G-cycle Q-cylinder engine, the G-cycle explosion occurs during two revolutions of the crankshaft, so that rotational torque fluctuations as shown in FIG. 2A occur.

On the other hand, the timing detection means S and the field current control means 2 apply a field current as shown in FIG. , the application of this field current generates a load torque (reverse torque) as shown in Figure 2 C, and the combination of this load torque C and rotational torque A results in the torque shown in Figure 1. The joint torque between the crankshaft and the rear axis is as follows, and its fluctuation range is suppressed to be small.

Reference numeral 11 denotes a battery state detection means for detecting an overcharged state of the battery 5, and 12 represents an energizing means, which receives a signal from the battery state detecting means 11 and detects that the battery 5 is in an overcharged state. At times, the hot wire heater 6a is energized to increase the electrical load.

The battery state detection means 11 detects a current change ' from both ends of a resistor 15 connected in series with the battery 5,
This is amplified by the differential amplifier circuit 14, and the set value Ve is added to this amplified value V1 by the adder circuit 15, and the signal v2 of the adder circuit 15 is output to the first comparator 16. Further, the battery voltage vs is input to the second comparator 17.

In the seventh comparator 16, the output V2'ir of the adder circuit 15 is
The first reference value vL is compared with the first reference value vL, and the first reference value vL is set in accordance with the capacity of the battery 5, etc. so that the durability of the overcharged battery 5 is not impaired in actual operating conditions. When the output v2 of the adder circuit 15 becomes larger than this value VI, a signal is output from the seventh comparator 16.

The second comparator 17 converts the battery voltage vs into a second reference value v
In comparison with B, this first reference value VB is set to a value close to the reference voltage (/, 2V) of the battery 5, and when the battery voltage vs becomes larger than this value vB, the second comparison is made. A signal is output from the device 17. In other words, when the battery 5 is almost fully charged, the first comparator 16
It has more output.

The output of the first comparator 16 and the second comparator 17 is as follows: A
The ND circuit 18 is manually powered, and the output of this AND circuit 18 is output to the energizing means 12.

The energizing means 12 is a switch 12a which opens and closes the tf to the hot wire heater 6a. When a signal is output from the AND circuit 18, that is, when a signal is output from both the first and second comparators 16 and 17, the battery 5
When the battery is in an overcharged state in which a large amount of power is generated and a large amount of current flows into the battery 5 side even though the battery is almost fully charged and a sufficient potential is present at the positive terminal, the switch 12at is closed. energize the hot wire heater 6a,
This increases the electric load to increase the discharge amount of the battery 5 and suppress overcharging.

Note that when the AND circuit 18 does not output a signal, that is, in a normal charging state, the hot wire heater 6
The switch 12a of a is opened/closed manually,
used for the intended purpose.

The present invention is not limited to the structure of the above embodiment, but includes various modifications. That is, in the above embodiment, the hot wire heater 6 is used as the electrical load to be energized during overcharging.
d, but other electric loads such as air conditioning fans that do not affect drivability no matter when they operate can be used as appropriate.

Further, as the timing detection means S, in addition to the above example, any method that detects the ignition pulse of the engine from the ignition circuit may be used. It is provided to apply a current.

As explained above, according to the present invention, by providing the timing detection means and the field current control means, as well as the battery state detection means and the energizing means,
It is possible to generate a reverse torque on the crankshaft when the torque increases, and to suppress the rotational torque fluctuations that occur on the crankshaft in synchronization with engine explosion, and it is possible to improve harmful effects such as vibration and teeth rattling noise. It can be done by using an existing alternator (7), and has the advantage of being cost-effective.At the same time, when the battery is in an overcharged state, it increases the discharge of the battery and prevents the occurrence of an overcharged state. However, the decrease in battery durability caused by overcharging can be completely suppressed.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram showing one embodiment of the present invention, Figure 2A
-D is an explanatory diagram showing the torque fluctuation suppressing effect. DESCRIPTION OF SYMBOLS 1... Alternator, 1a - Field coil, 1b - Stator coil, 2... Feenote current control means, 5... Timing detection means, 5.
... Battery, 6a ... Hot wire heater (electric load), 11 Battery status detection means, 12 ... Current supply means, y @gJ-→Header Nichi Q, dJ1# To %5 knee To Yamato Rinko 5 replacement 66

Claims (1)

[Claims] 0) Timing detection means for detecting when torque increases due to rotational torque fluctuations occurring in the crankshaft in synchronization with engine explosion, and full 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 detecting an overcharged state of the battery; a battery state detecting means for detecting an overcharged state of the battery; and a field current control means for detecting an overcharged state of the battery, and energizing an electric load such as a hot wire heater when the battery is in an overcharged state in response to a signal from the battery state detecting means. A current supply means is provided to generate a full reverse torque on the crankshaft when torque increases, and to energize the crankshaft VC in synchronization with engine explosion.
An engine torque fluctuation suppressing device characterized by suppressing rotational torque fluctuations that occur.