JP6036323B2 - Battery charge control device - Google Patents

Description

  The present invention relates to a battery charge control device for rectifying the output of an AC generator driven by an engine and charging the battery.

  In vehicles such as motorcycles, the battery is charged by rectifying the output of an AC generator driven by an engine. As the AC generator, a three-phase AC generator in which three coils are star-connected is generally used. Charging of the battery by the AC generator is controlled by a charge control device called a rectifier, which is responsible for rectification and voltage control.

JP-A-60-55900

The output design of the AC generator is designed so that the output is larger than the power consumption of the vehicle so as not to discharge during idling.
However, since the output characteristics of the alternator increase with the engine speed, the alternator generates surplus power in the engine speed range equal to or higher than the idling engine speed.

For example, in Patent Document 1, when the output of an AC generator exceeds a predetermined value, the connection of a three-phase generator coil is changed from a three-phase full-wave rectifier circuit to a single-phase full-wave rectifier via a bidirectional control rectifier. A DC power generator that is switched to three parallel circuits is disclosed.
However, when the battery is fully charged, the amount obtained by subtracting the required electric power of the vehicle becomes surplus, and an unnecessary load is applied to the engine.

  The present invention has been made in view of the above points, and an object thereof is to suppress excessive power generation of an AC generator driven by an engine.

The battery charge control device of the present invention is a battery charge control device for rectifying the output of a three-phase AC generator driven by an engine and charging the battery, and is connected to the AC generator. A switching means as a rectifying element; and a control means for switching the alternator to a single phase by controlling the switching means based on the engine speed, wherein the alternator includes a first coil. This is a three-phase AC generator in which the second coil and the third coil are star-connected, and the first and second switching means that allow current to flow in the forward direction and can be controlled on / off are the same in the forward direction. And one end of the first coil is connected between the first switching means on the downstream side in the forward direction and the second switching means on the upstream side in the forward direction. The third and fourth switching means capable of conducting current in the direction and being on / off-controllable are connected in series with the same forward direction, and one end of the second coil is located on the downstream side in the forward direction. The fifth and sixth switching means, which are connected between the switching means and the fourth switching means on the upstream side in the forward direction and flow current in the forward direction and can be controlled on / off, have the same forward direction. In series connection, one end of the third coil is connected between the fifth switching means on the downstream side in the forward direction and the sixth switching means on the upstream side in the forward direction, and the first, 3. A positive line is connected downstream in the forward direction of the fifth and fifth switching means, and a ground line is connected upstream in the forward direction of the second, fourth, and sixth switching means. Between the positive line and the ground line. Connected to the battery. The control means turns off the first and second switching means, turns off the third and fourth switching means, or turns off the fifth and sixth switching means. The three-phase AC generator is switched to a single-phase type by either turning it off .
Another feature of the battery charge control device according to the present invention is that the control means is configured to change the AC generator to a three-phase type in a low engine speed range with a predetermined threshold as a reference, and to a medium to high engine speed. In the region, the AC generator is in a single-phase type .
Another feature of the battery charge control device according to the present invention is that the control means sets the AC generator to a single-phase type in a middle and high engine speed range with a predetermined threshold as a reference, and uses a low engine speed. In the range, it is determined whether or not the change amount of the engine speed is equal to or greater than a predetermined change amount threshold value, and when the change amount of the engine speed is smaller than the predetermined change amount threshold value, the AC generator is turned off. A three-phase system is used, and when the amount of change in engine speed is equal to or greater than the predetermined change amount threshold, the AC generator is in a single-phase system.
Another feature of the battery charge control device according to the present invention is that the control means calculates an engine speed based on an output waveform cycle of the AC generator.
Another feature of the battery charge control apparatus according to the present invention is that the control means calculates a change amount of the engine speed based on an output waveform cycle of the AC generator.
The battery charge control device of the present invention is a battery charge control device for rectifying the output of a three-phase AC generator driven by an engine and charging the battery, and is connected to the AC generator. A switching means as a rectifying element; and a control means for switching the AC generator to a single-phase type by controlling the switching means based on the engine speed, the control means being based on a predetermined threshold value In the middle and high engine speed range, the AC generator is a single-phase type, and in the low speed range, it is determined whether or not the engine speed change amount is equal to or greater than a predetermined change amount threshold. When the change amount of the rotational speed is smaller than the predetermined change amount threshold value, the AC generator is set to a three-phase type. When the change amount of the engine speed is equal to or larger than the predetermined change amount threshold value, the alternating current generation is performed. Characterized by a machine to a single-phase type.
Another feature of the battery charge control apparatus according to the present invention is that the control means calculates a change amount of the engine speed based on an output waveform cycle of the AC generator.

  According to the present invention, since the engine speed directly related to the output of the alternator is used as a parameter, the three-phase alternator is switched to the single-phase type, so that excessive power generation of the alternator can be suppressed. it can. Thereby, the useless load of the engine by an alternating current generator can be reduced, and a fuel consumption can be improved. Further, it is possible to reduce the amount of heat generated in the charge control device, thereby improving durability and reducing the size.

It is a figure which shows the structure of the charge control apparatus of the battery which concerns on embodiment. It is a flowchart which shows the control processing by the control circuit in 1st Embodiment. FIG. 3 is an equivalent circuit diagram showing a state where a three-phase AC generator is switched to a single-phase type. It is a characteristic view which shows the relationship between an engine speed and the output current of an AC generator. It is a figure which shows the structure in the case of connecting the charge control apparatus of a battery to ECU. It is a flowchart which shows the control processing by the control circuit in 2nd Embodiment.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
(First embodiment)
FIG. 1 shows a configuration of a battery charge control device according to the present embodiment.
The AC generator 1 is a three-phase AC generator in which three coils 2, 3 and 4 are star-connected, and is driven by an engine. The charging of the battery B by the AC generator 1 is controlled by a charge control device called a rectifier that takes charge of rectification and voltage control.

The charging control apparatus according to the present embodiment is a full-wave rectification type, and thyristors 5 and 6 are connected in series with the same forward direction as rectifying elements, and one end of the coil 2 is connected between the thyristors 5 and 6. Similarly, thyristors 7 and 8 as rectifiers are connected in series with the same forward direction, and one end of coil 3 is connected between thyristors 7 and 8. Further, thyristors 9 and 10 as rectifiers are connected in series with the same forward direction, and one end of the coil 4 is connected between the thyristors 9 and 10.
A positive line 11 is connected to the cathode side of the thyristors 5, 7, 9 on the downstream side in the forward direction, and a ground line 12 is connected to the anode side of the thyristors 6, 8, 10 on the upstream side in the forward direction. The battery B is connected between the positive line 11 and the ground line 12, and the battery B is charged with the output current of the thyristors 5, 7, and 9.

Each gate of the thyristors 5 to 10 is connected to a control circuit 13 constituted by an IC, and the gate voltage is controlled by the control circuit 13.
The control circuit 13 monitors the battery voltage, and turns on the thyristors 5 to 10 when the battery voltage is less than a predetermined voltage. At this time, the battery B is charged with the output currents of the thyristors 5, 7, 9 (see solid line arrows in the figure). When the battery voltage reaches a predetermined voltage, the control circuit 13 turns off the thyristors 5 to 10 and shuts off the AC generator 1 and the battery B (see the dotted arrow in the figure), that is, the circuit To open.

Here, the control circuit 13 takes in the output of the AC generator 1 calculates the engine speed N _e based on the period that the output waveform (the period of the current waveform or voltage waveform).

FIG. 2 is a flowchart showing a control process by the control circuit 13 in the first embodiment. The flowchart of FIG. 2 is executed in the control circuit 13 at regular intervals, for example.
In step S101, the control circuit 13 calculates the engine speed N _e based on the output waveform period of the AC generator 1.

In step S102, the control circuit 13, the engine speed N _e computed in step S101 is equal to or greater than a predetermined threshold value N.

When the engine speed N _e is less than the threshold value N in step S102, the process proceeds to step S103. In step S103, the control circuit 13 performs open control. That is, as described above, when the battery voltage is less than the predetermined voltage, the thyristors 5 to 10 are turned on, but when the battery voltage reaches the predetermined voltage, the thyristors 5 to 10 are turned off, and the AC generator 1 and battery B are disconnected.

The contrast, when the engine speed N _e is not less than the threshold value N in step S102, the process proceeds to step S104. In step S104, the control circuit 13 performs open control after switching the three-phase AC generator 1 to the single-phase type. Specifically, the control circuit 13 turns off the thyristors 9 and 10 connected to the coil 4, for example. Thereby, substantially as shown in FIG. 3, the three-phase type alternating current generator 1 can be switched to a single phase type.
Even in the state of switching to the single-phase system, open control is performed. That is, when the battery voltage is lower than the predetermined voltage, the thyristors 5 to 8 are turned on. When the battery voltage reaches the predetermined voltage, the thyristors 5 to 8 are turned off, and the AC generator 1 and the battery B are turned off. Cut off.

  As described above, the AC generator 1 is switched to the three-phase system in the low engine speed range with the threshold value N as a reference, and the AC generator 1 is switched to the single-phase system in the medium and high engine speed range. FIG. 4 shows the relationship between the engine speed and the output current of the AC generator 1. As shown by a solid line in FIG. 4, it is possible to suppress surplus power generation of the AC generator 1 in the middle and high rotation speed range while securing a necessary output current in the low rotation speed range. By suppressing surplus power generation, it is possible to reduce a useless load on the engine by the AC generator 1 and improve fuel efficiency. Further, by suppressing excessive power generation, it is possible to reduce the amount of heat generated in the charge control device and improve durability and downsizing (downsizing of components such as a heat sink).

In the present embodiment, the control circuit 13 is set to calculates the engine speed N _e based on the output waveform period of the AC generator 1, may be acquired engine speed N _e from the outside. For example, as shown in FIG. 5, ECU may be configured to signal corresponding to the engine speed N _e to the control circuit 13 from the (engine control unit) 14 is notified. When the engine speed N _e is calculated by the control circuit 13, a connection for acquiring the engine speed N _e from the outside is not necessary, and the degree of freedom of arrangement and assembly of the charge control device can be improved. On the other hand, when the engine speed N _e is acquired from the outside, it is not necessary to calculate the engine speed N _e by the control circuit 13, and the circuit configuration of the control circuit 13 can be simplified.
Further, it is determined whether the engine speed N _e is the threshold value N or more with ECU 14, when the engine speed N _e is not less than the threshold value N, the switching signal to switch to the single-phase to the control circuit 13 (on Off signal) may be notified. In this case, it is not necessary to make a determination of the engine speed N _e in control circuit 13, it is possible to simplify the circuit configuration of the control circuit 13.

  In the present embodiment, the example in which the threshold value N is a fixed value has been described. However, the threshold value N may be changed according to the state of the vehicle. For example, when an accessory is added, the required power of the vehicle changes, so the ECU 14 or the like may analyze the required power and change the threshold N based on the value. Further, when an output shortage due to phase switching is detected, the subsequent threshold value N may be reset.

(Second Embodiment)
In the second embodiment, in addition to the engine speed N _e, further examples will be described for switching the AC generator 1 of the three-phase single-phase type based on variation .DELTA.N _e of engine speed. The configuration of the battery charge control device is the same as that of the first embodiment, and the following description will focus on differences from the first embodiment.
In the present embodiment, the control circuit 13 takes in the output of the AC generator 1 calculates the engine speed N _e based on the output waveform period can further calculates a change amount .DELTA.N _e of engine speed .

FIG. 6 is a flowchart showing a control process by the control circuit 13 in the second embodiment. In addition, the same code | symbol is attached | subjected to the process similar to the flowchart of FIG. 2, and the description is abbreviate | omitted.
When the engine speed N _e is less than the threshold value N in step S102, the process proceeds to step S103, the control circuit 13 performs open control already described.
In parallel with the open control in step S103, in step S105, the control circuit 13 calculates the engine speed change amount ΔN _e based on the output waveform cycle of the AC generator 1.
In step S106, the control circuit 13, change amount .DELTA.N _e of engine speed calculated in step S105 is equal to or greater than a predetermined threshold value .DELTA.N. A value greater than 0 is set as the threshold value ΔN, and the engine speed change amount ΔN _e is equal to or greater than the threshold value ΔN, that is, the vehicle is in an apparent acceleration state, or the engine speed change amount ΔN _e is less than the threshold value ΔN, that is, It is determined whether the vehicle is not in an apparent acceleration state (the vehicle is decelerating at a constant speed or decelerating, or is slightly accelerating on a slope).
When the engine speed change amount ΔN _e is less than the threshold value ΔN in step S106, the process returns to step S103 and the open control is continued.
On the other hand, when the engine speed change amount ΔN _e is greater than or equal to the threshold value ΔN in step S106, the process proceeds to step S104, and the open control is performed after the three-phase AC generator 1 is switched to the single-phase type.

  As described above, the alternator 1 is switched to the three-phase system when the amount of change in the engine speed is small with the threshold value ΔN as a reference, and the alternator 1 is switched to the single-phase system when it is large. Thereby, the electric power generation amount can be adjusted according to the acceleration / deceleration state of the vehicle. For example, the engine speed is greatly increased by the operation of the occupant, that is, when the vehicle is in an apparent acceleration state, the load on the engine can be reduced as a single-phase system, and the acceleration performance can be improved.

In the present embodiment, the control circuit 13 is set to calculates a change amount .DELTA.N _e of the engine speed based on the output waveform period of the AC generator 1, as in the case of the engine speed N _e, the control circuit from the ECU14 13 and notifies a signal corresponding to the change amount N _e of engine speed, when it is determined that the change amount N _e of engine speed is the threshold value ΔN or more with ECU 14, to switch to the single-phase to the control circuit 13 It may be configured to notify a switching signal (on / off signal).

  As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention. For example, in the above-described embodiment, an example in which a thyristor is used as the switching means in the present invention has been described. However, the present invention is not limited to a thyristor as long as a current flows in the forward direction and ON / OFF control is possible.

  B: Battery, 1: AC generator, 2-4: Coil, 5-10: Thyristor, 11: Positive line, 12: Ground line, 13: Control circuit, 14: ECU

Claims (7)

A battery charge control device for rectifying the output of a three-phase AC generator driven by an engine and charging the battery,
Switching means as a rectifying element connected to the AC generator;
Control means for switching the AC generator to a single phase by controlling the switching means based on the engine speed ,
The AC generator is a three-phase AC generator in which the first coil, the second coil, and the third coil are star-connected.
The first and second switching means that allow current to flow in the forward direction and can be turned on / off are connected in series with the same forward direction, and one end of the first coil is on the downstream side in the forward direction. Between the switching means and the second switching means on the upstream side in the forward direction,
The third and fourth switching means that allow current to flow in the forward direction and can be controlled on / off are connected in series with the same forward direction, and one end of the second coil is on the downstream side in the forward direction. Between the switching means and the fourth switching means on the upstream side in the forward direction,
The fifth and sixth switching means that allow current to flow in the forward direction and can be turned on / off are connected in series with the same forward direction, and one end of the third coil is on the downstream side in the forward direction. Between the switching means and the sixth switching means on the upstream side in the forward direction,
A positive line is connected downstream in the forward direction of the first, third, and fifth switching means, and a ground line is connected upstream in the forward direction of the second, fourth, and sixth switching means. The battery is connected between the ground line and
Whether the control means turns off the first and second switching means, turns off the third and fourth switching means, or turns off the fifth and sixth switching means The battery charge control device according to any one of the above, wherein the three-phase AC generator is switched to a single-phase type .   The control means is characterized in that the AC generator is a three-phase type in a low engine speed range with a predetermined threshold as a reference, and the AC generator is a single-phase type in a medium and high engine speed range. The battery charge control device according to claim 1. The control means makes the AC generator a single-phase type in a middle and high engine speed range with a predetermined threshold as a reference,
In the low speed range, it is determined whether or not the change amount of the engine speed is equal to or greater than a predetermined change amount threshold value. When the change amount of the engine speed is smaller than the predetermined change amount threshold value, the alternating current 2. The battery charging according to claim 1, wherein the generator is a three-phase type, and the alternator is a single-phase type when the amount of change in engine speed is equal to or greater than the predetermined change amount threshold. Control device. Wherein, the charging control apparatus for a battery according to any one of claims 1 to 3, characterized in that to calculate the engine speed based on the output waveform period of said AC generator. 4. The battery charge control device according to claim 3 , wherein the control means calculates an amount of change in engine speed based on an output waveform period of the AC generator. A battery charge control device for rectifying the output of a three-phase AC generator driven by an engine and charging the battery,
Switching means as a rectifying element connected to the AC generator;
Control means for switching the AC generator to a single phase by controlling the switching means based on the engine speed ,
The control means makes the AC generator a single-phase type in a middle and high engine speed range with a predetermined threshold as a reference,
In the low speed range, it is determined whether or not the change amount of the engine speed is equal to or greater than a predetermined change amount threshold value. When the change amount of the engine speed is smaller than the predetermined change amount threshold value, the alternating current A battery charge control device characterized in that the generator is a three-phase type and the alternator is a single-phase type when the amount of change in engine speed is equal to or greater than the predetermined change amount threshold . The battery charge control device according to claim 6 , wherein the control unit calculates a change amount of the engine speed based on an output waveform cycle of the AC generator.

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