JP2002095176A - Charging system for service car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging system which is suitable for service cars and inexpensive. SOLUTION: A first battery 46 which supplies power to electric parts M3-M5 of low-voltage specifications is charged with a low-voltage alternator 37, and the first battery 46 and a second battery 47 which supply power to electric parts M1-M2 of high-voltage specifications are charged with a high-voltage alternator 32. Accordingly, it is possible to keep the first battery 46 whose load is heavier as compared with the second battery 47 in a proper charged state always, by charging the first battery 46 with the low-voltage alternator 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a charging system suitable for a work vehicle.

[0002]

2. Description of the Related Art A working vehicle is equipped with various electric components. An electric snow blower will be specifically described as an example.
Traveling electric motor (rated 24V), auger elevating motor (rated 24V), shooter swing motor (rated 12V),
It is equipped with electric components of two types of rated voltages, such as a shooter tilt motor (rated 12 V) and a cell motor (rated 12 V). Since these motors are all small DC motors and use commercially available products that are inexpensive and easily available, it is inevitable that electric components having two types of rated voltages are mixed.

FIG. 9 is a circuit diagram of a conventional power supply system, in which a first battery 101 and a second battery 102 are arranged in series, a middle point between the batteries 101 and 102 is a contact B, and a first battery When one end of 101 is referred to as contact A and the other end of the second battery 102 is referred to as contact C, the electric motor M1 for traveling and the auger elevating motor M2 are connected to the contacts C and A, and the contacts B and A are connected to each other. Shooter turning motor M3, shooter tilting motor M4, and cell motor M5
Is connected. Thus, the motors M1 and M2 can receive 24V power supply, and the other motors M3 to M5 can receive 12V power supply.

FIG. 10 is a circuit diagram of a conventional charging system, in which a regulator 104 is attached to an AC generator 103, and the regulator 104 controls a field current flowing through a field coil of the AC generator 103 to thereby generate a generated voltage. The control unit supplies necessary electric power to various electric devices and appropriately charges the batteries 101 and 102.

[0005]

[0009] Even if the batteries 101 and 102 are satisfactorily charged by the charging system shown in FIG. 10, the first battery 101 has a larger load than the second battery 102 shown in FIG. The battery 101 is likely to be excessively discharged. As a result, the life of the first battery 101 is shorter than that of the second battery 102. Generally, it is considered unfavorable to use a new battery and an old battery together. Therefore, the batteries 101 and 102 must be replaced at the same time.
At the stage when the life of the battery 101 has expired, the second battery 102 that is still sufficiently usable is discarded, and there is a problem in terms of effective use of resources.

As a countermeasure against this, for example, Japanese Patent Application Laid-Open
No. 335, “Vehicle power supply device” has been proposed. In the circuit diagram of FIG. 1 of the publication, the present invention comprises a voltage converter 7 in the AC generator 1, and the voltage converter 7 selectively converts an AC power supply into a high-voltage DC power supply and a low-voltage DC power supply. The first battery 2 and the second battery 3 can be charged at a high voltage, the first battery 2 can be charged at a low voltage only, and the batteries 2 and 3 can be balanced.

However, the voltage converter 7 requires a transistor 10, a comparator 11, a triangular wave oscillator 12, an operational amplifier 13, resistors 15, 16, 19, 21, and capacitors 17, 19, 20, 21 and the like, which is extremely complicated. It has a simple structure. The use of the work vehicle is limited to snow removal, weeding, transport of agricultural products, and the like, and the use time is also limited. Therefore, there is a problem in equipping a complicated and expensive device such as the voltage converter 7 described above. This is because various problems arise, such as a rise in the price of a work vehicle and the need to transport complicated vehicles to a specialized repair shop, which increases inspection costs.

Accordingly, an object of the present invention is to provide an inexpensive charging system suitable for a work vehicle.

[0009]

According to one aspect of the present invention, there is provided a working vehicle equipped with an internal combustion engine and equipped with a high-voltage electric component and a low-voltage electric component.
This work vehicle is a first vehicle that supplies power to low-voltage electrical components.
A first battery connected in series with the first battery;
The second to supply high-voltage electrical components with the battery
A high-voltage alternator that charges the first battery and the second battery connected in series with a high voltage, and a low-pressure alternator that charges only the first battery with a low voltage; Connected to the crankshaft of the engine, the low-pressure alternator attaches a permanent magnet to the flywheel fixed to the crankshaft, attaches a generator coil to the crankcase side, and generates electricity by the induction action between the permanent magnet and the generator coil. It is characterized by the following.

The transmission mechanism connecting the crankshaft and the high-pressure alternator may be a pulley / timing belt, a gear / gear, or an equivalent well-known transmission device, and may be of any type and type. High-pressure alternators are standard equipment in general-purpose internal combustion engines such as gasoline engines. However, low pressure alternators are not standard. Therefore, this low-pressure alternator is easily added by effectively utilizing the flywheel. That is, the main part of the low-pressure alternator is configured by attaching a permanent magnet to the flywheel and attaching a generating coil to the crankcase side. If the first battery is charged by this low-pressure alternator, the first battery having a larger load than the second battery can always be kept in an appropriate charged state.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. The work vehicle is a snowplow, lawn mower, mower,
It is a vehicle that can be used as a transporter for transporting agricultural products.
It is called a working vehicle because it is a vehicle that reduces the burden on the workers by driving or rotating it with an internal combustion engine or an electric motor.

FIG. 1 is a side sectional view of a working vehicle according to the present invention. In a snow blower 10 as a working vehicle, a “running portion” is rotatably mounted on a body frame 11 and the body frame 11. A driving wheel 12, an idler wheel 13, a crawler 14 bridging these, and a traveling motor M <b> 1 for driving the driving wheel 12. The swing frame 17 is mounted so as to be able to move up and down, a lifting cylinder 18 that moves the swing frame 17 up and down, a gasoline engine 19 as an internal combustion engine mounted on the swing frame 17, and a crank shaft 21 of the engine 19. A first pulley 22, a second pulley 23, a flywheel 24, a working unit drive shaft 25 rotated by the second pulley 23, A blower 26 attached, the auger 27 to turn the work unit drive shaft 25, a housing 28 covering the with and auger 27 surrounds the blower 26, which is constituted by a chute 29 which extends upward from the housing 28.

The working unit drive shaft 25 is driven by the gasoline engine 19.
When the blower 26 and the auger 27 are turned by the working unit drive shaft 25, snow on the road surface is brought by the auger 27, the snow is accelerated by the blower 26, and the snow can be thrown through the chute 29.

The electric components mounted on the snow blower 10 will be described.
8, an auger elevating motor M2, a chute 29 a shooter turning motor M3 and a shooter tilting motor M4, and a gasoline engine 19 a cell motor M5. In addition,
The chute 29 can be turned in the direction of the arrow by the action of the chute turning motor M3, and the tilt angle of the chute 29 can be adjusted in the direction of the arrow by the action of the chute tilting motor M4.

FIG. 2 is a view taken in the direction of arrow 2-2 in FIG. 1 (arrangement view of the high-pressure alternator according to the present invention). Similar to a normal gasoline engine, a first pulley 22 is mounted on a crankshaft 21 and a second pulley 22 is mounted. A timing belt 31 is wound around one pulley 22, and the high-speed alternator 3 is
2 was rotated. The alternator has a rectifier attached to a three-phase AC generator and outputs a DC of a constant voltage. Since the alternator is most widely used as a vehicular generator, the description of the internal structure is omitted. Note that the high-pressure alternator 32 may be connected to the crankshaft 21 by a gear. In short, the high-pressure alternator 32 is directly rotated by the crankshaft 21.

FIG. 3 is a mounting view of the low-pressure alternator.
At least one permanent magnet 34 is attached to the inner peripheral surface 33 of the flywheel 24 fixed to the crankshaft 21, and the power generating coils 35, 35 are opposed to the permanent magnet 34.
Is attached to brackets 36, 36 extending from the crankcase of the engine. FIG. 4 is 4-4 of FIG.
FIG. 4 is a sectional view taken along a line, in which the flywheel 24 is
It rotates at high speed in synchronization with. On the other hand, the power generation coils 35, 35
Is stationary. Since the permanent magnet 34 passes through the power generation coil 35, AC power can be generated by the induction action. The power generating coil 35 and the permanent magnet 34 are essential parts of the low-pressure alternator 37 of the present invention.

FIG. 5 is a charging system circuit diagram according to the present invention.
The terminals of the high-voltage alternator 32 that can generate 24 VDC by combining the high-voltage AC generator 41 with the high-pressure regulator 42 are terminals C and A, and the low-voltage AC generator 43 is combined with the low-pressure regulator 44 to obtain a direct current. Low pressure alternator 3 capable of generating 12V
The terminal 7 is a terminal B and a terminal A to constitute a circuit.

FIG. 6 is a circuit diagram of the charging system according to the present invention, which is substantially the same as FIG. 9 than FIG. That is, the first battery 46 and the second battery 47 are arranged in series, and the middle of the batteries 46 and 47 is the contact B, one end of the first battery 46 sandwiching the contact B is the contact A, When one end is called a contact C, the traveling electric motor M1 and the auger elevating motor M2 are connected to the contact C and the contact A, and the shooter turning motor M3, the shooter tilting motor M4 and the cell motor M5 are connected to the contact B and the contact A. Connect. As a result, the motors M1 and M2
The other motors M3 to M5 can be supplied with 12V power supply.

The high-voltage alternator 3 is connected to the contacts C and A.
2 and the low-pressure alternator 37 is connected to the contacts B and A. Shooter turning motor M3, Shooter tilting motor M
4 or the starter M5, the first battery 46
May fall below the voltage of the second battery 47. However, such inconvenience does not occur because the first battery 46 is charged by the low-voltage alternator 37. The regulators 42, 44 provided in the high- and low-pressure alternators 32, 37 exhibit an overcharge avoiding action.

FIG. 7 is an evaluation graph (No. 1) of the charging system of the present invention, in which the horizontal axis represents working time and the vertical axis represents voltage. A first battery and a second battery each having a terminal voltage of 12.4 V were mounted on a snow blower, and a gasoline engine of the snow blower was started, and a predetermined operation was performed for 16 minutes while maintaining the speed at 3000 rpm. After the work was completed (after stabilization), the voltages of the first battery and the second battery were measured.
It was 2.7V.

FIG. 8 is a graph (part 2) of an evaluation experiment of the charging system of the present invention, in which a first battery having a terminal voltage of 12.9 V and a second battery having the same 12.5 V are mounted on a snow blower. When the gasoline engine of the snow blower was started, a predetermined operation was performed for 87 minutes while maintaining the rotation speed at 3000 rpm, and once the operation was completed (after stabilization), the voltages of the first battery and the second battery were measured. The first battery is 1
The second battery was up 2.8V, or 0.1V, and the second battery was up 13.0V, or 0.5V. When the engine was started, it was driven for a further 189 minutes for a further 102 minutes, the work was completed (after stabilization), and the voltages of the first battery and the second battery were measured.
The voltage increased by 0.1 V, and the second battery remained at 13.0 V.

FIG. 7 shows that there was no imbalance between the batteries because the first and second batteries having the same voltage were used. On the other hand, in FIG. 8, when the first and second batteries to which an imbalance of 0.4 V is intentionally used are used, the imbalance is 0.2 V after 87 minutes, and the imbalance is 0.2 after 189 minutes.
1 V, which means that the imbalance was practically acceptable. That is, according to the present invention, a flywheel having a sufficient space can be skillfully used, and a low-pressure alternator can be attached to the flywheel, thereby suppressing variation among a plurality of batteries.

In the embodiment, the high-voltage specification is set to 24 V and the low-voltage specification is set to 12 V. These numerical values are reference values. The number of batteries is not limited as long as the number is two or more.

[0024]

According to the present invention, the following effects are exhibited by the above configuration. According to a first aspect of the present invention, there is provided a working vehicle provided with an internal combustion engine and equipped with a high-voltage specification electric component and a low-voltage specification electric component, and a first battery for supplying power to the low-voltage specification electric component, and a series connection to the first battery. Then, a second battery that supplies electric components of a high voltage specification in combination with the first battery, a first battery connected in series, a high voltage alternator that charges the second battery with a high voltage, and a low voltage voltage only for the first battery. Since the low-voltage alternator for charging is provided, if the first battery is charged by the low-voltage alternator, the first battery having a larger load than the second battery can always be kept in an appropriate charged state.

For this purpose, a high-pressure alternator is applied to an alternator normally mounted on an engine, and a low-pressure alternator is provided by attaching a permanent magnet to a flywheel fixed to a crankshaft, and attaching a generating coil to a crankcase side. It can be easily configured.

Therefore, according to the present invention, the imbalance between batteries can be effectively eliminated with a very small investment without using a complicated and expensive electronic control circuit, and the operation and the use period are limited. A suitable charging system for a vehicle can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a working vehicle according to the present invention.

FIG. 2 is a view taken in the direction of arrow 2-2 in FIG. 1 (arrangement diagram of a high-pressure alternator according to the present invention).

FIG. 3 is a mounting diagram of a low-pressure alternator.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a circuit diagram of a charging system according to the present invention.

FIG. 6 is a circuit diagram of a charging system according to the present invention.

FIG. 7 is an evaluation graph of the charging system of the present invention (part 1).

FIG. 8 is an evaluation graph (part 2) of the charging system of the present invention.

FIG. 9 is a circuit diagram of a conventional power supply system.

FIG. 10 is a circuit diagram of a conventional charging system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Work vehicle (snow plow), 19 ... internal combustion engine (gasoline engine), 21 ... crankshaft, 32 ... high-pressure alternator, 34 ... permanent magnet, 35 ... power generation coil, 37 ... low-pressure alternator, 46 ... first battery, 47: second battery, M1, M2: electric parts of high voltage specification, M3 to M5: electric parts of low voltage specification.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsutomu Inai 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (Reference) 5G060 AA08 BA01 BA08 CA02 CA21 5H621 BB01 BB02 BB07 JK15

Claims (1)

[Claims] 1. A work vehicle provided with an internal combustion engine and equipped with a high-voltage specification electric component and a low-pressure specification electric component, wherein the work vehicle supplies power to the low-voltage specification electric component.
A first battery connected in series with the first battery;
The second to supply high-voltage electrical components with the battery
A battery, a first battery connected in series, a high-voltage alternator that charges the second battery with a high-voltage, a low-pressure alternator that charges only the first battery with a low-voltage,
Wherein the high-pressure alternator is connected to a crankshaft of an internal combustion engine via a transmission mechanism, the low-pressure alternator has a permanent magnet attached to a flywheel fixed to the crankshaft, a generator coil attached to a crankcase side, A charging system for a working vehicle, wherein power is generated by an induction action between a magnet and a power generating coil.