JPH04217828A - Power supply for vehicle - Google Patents

Abstract

PURPOSE:To provide a power supply for vehicle, in which two generators can be installed easily, without requiring modification of the periphery of belt or a new drive shaft. CONSTITUTION:Power supply for vehicle comprises a first generator 2 for feeding power to a first load mounted on the vehicle and charging a battery mounted on the vehicle and a second generator 4 for feeding power to a second electric load different from the first electric load. One of the first and second generators is driven through a belt 14 coupled with the crankshaft 11 of an engine 1 while the other generator is driven by a rotary shaft 31 coupling the engine 1 with a speed change gear 3.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention provides power, for example, by two generators, respectively, to a first electrical load operating on battery voltage and a second electrical load operating at a higher voltage than the first electrical load. The present invention relates to a vehicle power supply device.

0002

2. Description of the Related Art In recent years, there has been a demand for a multi-voltage power supply having a voltage different from the voltage conventionally used in vehicles (for example, 12V or 24V). For this reason, the applicant proposed a vehicle power supply device equipped with a plurality of generators in Japanese Unexamined Patent Publication No. 2-97236.

0003

[Problems to be Solved by the Invention] However, in conventional vehicle power supply devices, it is necessary to reduce the size of the engine room and to reduce the size of auxiliary equipment such as power steering pumps that are driven by the output shaft of the engine via a belt. Due to this increase, it has become difficult to install multiple generators in locations where they can be driven by belts as in the past due to space constraints. Therefore, when installing multiple generators around the belt, it was necessary to change the area around the belt.

Therefore, in some vehicles, one generator is driven by the output shaft of the engine via a belt, and the other generator is driven by a dedicated generator connected to the output shaft of the vehicle transmission via a gear mechanism. There is a vehicle power supply device that is driven by a drive shaft and prevents changes in the vicinity of the belt. However, in this vehicle power supply device, a gear mechanism and a drive shaft are newly required to drive the other generator, resulting in an increase in the number of parts.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle power supply device in which two generators can be easily installed without changing the area around the belt or requiring a new drive shaft.

[0006]

[Means for Solving the Problems] The present invention provides a first generator for supplying power to a first electrical load mounted on a vehicle and charging a battery mounted on the vehicle; a second generator that supplies power to a different second electrical load, one of the first and second generators being driven by a belt connected to the output shaft of the engine, The machine adopted a technical means of being driven by a rotating shaft connecting the engine and a transmission driven by the engine.

[0007]

[Operation] According to the present invention, power is generated by rotating one of the first and second generators by the output shaft of the engine via a belt. Further, the other generator is driven by a rotating shaft that connects the engine and the transmission driven by the engine, thereby generating electricity. Therefore, the battery is charged and power is supplied to the first electrical load and a second electrical load different from the first electrical load.

[0008]

[Effects of the Invention] The present invention eliminates the need to install both the first and second generators in positions where they can be driven by a belt, and furthermore, the other generator is driven by a rotating shaft that connects the engine and the transmission. By doing so, it is possible to reduce the number of parts by eliminating the need for a new drive shaft exclusively for the generator, and it is also possible to easily install two generators without changing the area around the belt that drives one of the generators. I can do it.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The vehicle power supply device of the present invention will be explained based on the embodiments shown in the drawings. 1 and 2 show a first embodiment of the invention. FIG. 1 is a partial sectional view showing the installation structure of a vehicle power supply device in a vehicle engine, and FIG. 2 is an electrical wiring diagram of the vehicle power supply device.

As shown in the figure, the vehicle power supply device A includes a first generator 2 driven by a belt 14 connected to a crankshaft 11 as an output shaft of the vehicle engine 1, the vehicle engine 1, and this engine. The second generator 4 is driven by a crankshaft 11 serving as a rotating shaft that connects a transmission 3 driven by a second generator 4 to generate electricity.

[0011] The on-vehicle engine 1 is a four-cylinder gasoline engine, and is disposed in the engine compartment of the vehicle.

The first generator 2 is fixed to the engine block parallel to the crankshaft 11, and the crank pulley 12 attached to the crankshaft 11 and the pulley 1 of the first generator 2 are connected to each other.
The rotational speed of the crankshaft 11 of the engine 1 is increased by a belt 14 stretched between the engine 1 and the engine 1 . Moreover, as shown in FIG. 2, this first generator 2 also includes a stator coil 21 and a rotor coil 22 that constitute the generator main body.
, an accompanying regulator 23, and a diode bridge 24.

The regulator 23 controls the voltage generated by the first generator 2 to a target voltage (for example, DC 14V) suitable for charging the battery 6 that supplies power to the first electrical load 5 mounted on the vehicle. The electric current of the rotor coil 22 is adjusted by the method to control the power generation amount of the first generator 2.

The transmission 3 is a device that changes the rotational speed of the crankshaft 11, and is disposed at the rear of the engine 1.

[0015] The second generator 4 is located between the crankshaft 11 of the engine 1 and the torque converter 32 connected to the rotating shaft 31 of the transmission 3. In this embodiment, the first generator 2
be used with priority.

The rotor core 41 has an approximately U-shaped cross section and is bolted to the torque converter 32 of the transmission 3 at its outer periphery, and bolted to the crankshaft 11 at its inner part to rotate together with the crankshaft 11.

The excitation coil 42 is wound around a fixed core 421 fixed to the engine 1, and the excitation coil 42 and the fixed core 421 are surrounded by the outer periphery of the rotor core 41.

The stator core 43 is fixed in an annular manner to the inner wall of a generator housing 40 that covers and protects the second generator 4, and is wound with three-phase stator windings 44.

The diode bridge 45 is composed of six silicon diodes and is electrically connected between the stator winding 44 and the inverter 7.

The regulator 46 controls the excitation current using a known method to bring the potential of the line to a predetermined value.

The thyristor bridge 48 is composed of three thyristors and is electrically connected between the stator winding 44 and the battery 6.

5 is a first electrical load, such as a headlight, wiper, ignition device, radio, etc.
It is an electrical component that uses

The battery 6 is a lead-acid battery with a voltage of 12V.

The inverter 7 is a diode bridge 45
This is a device that converts the rectified output into 60Hz, 100V alternating current.

The second electrical load 8 is an electrical component connected to the inverter 7 that uses 100 V AC, such as a refrigerator, a hot refrigerator, and an ice melter.

Next, the operation of the vehicle power supply device A will be explained.

[0027] Due to the operation of the engine 1, the crank pulley 1
2 rotates, and the pulley 13 rotates via the belt 14. As the pulley 13 rotates, the rotor coil 22 of the first generator 2 rotates. When the rotor coil 22 is energized at this time, an exciting force is generated in the rotor coil 22. This excitation force generates three-phase alternating current in the stator coil 21 rotating relative to the rotor coil 22, and this three-phase alternating current is full-wave rectified by the diode bridge 24. The rectified output of the diode bridge 24 charges the battery 6 and supplies power to the first electrical load 5 .

On the other hand, as the crankshaft 11 rotates due to the operation of the engine 1, the rotor core 41 of the second generator 4 also rotates, and the excitation coil 42 is energized, so that the first generator 2 and Similarly, three-phase alternating current is generated in stator winding 44, and this three-phase alternating current is full-wave rectified by diode bridge 45.

Incidentally, the inverter 7 converts the rectified output of the diode bridge 45 into an alternating current (for example, 60Hz-100V).
) and supplies power to the second electric load 8.

The thyristor bridge 48 is connected to the stator winding 4
In addition to half-wave rectifying the three-phase alternating current generated at 4, the output is converted to a voltage suitable for charging the battery 6 (
For example, the voltage is stepped down to DC 14 V) to charge the battery 6 and supply power to the first electric load 5.

Next, the effects of this embodiment will be described.

(A) Since the second generator 4 is disposed between the on-vehicle engine 1 and the torque converter 32 of the transmission 3, and the rotor core 41 is directly coupled and driven by the crankshaft 11, the first, There is no need to install both the second generators 2 and 4 in positions where belt drive is possible. In addition, a new drive shaft dedicated to the second generator 4 is not required, and the number of parts can be reduced, and the two generators 2 and 2 can be easily connected without changing the area around the belt 14 that drives the first generator 4 can be installed, so it does not occupy a significant amount of space in the engine room.

(i) Since the second generator 4 is directly driven by the crankshaft 11 of the on-vehicle engine 1, there is no loss due to belts, etc., and the power generation efficiency is high. Moreover, since this second generator 4 is used preferentially, the efficiency can be increased (compared to the case where two belt-driven generators are used) since the above-mentioned loss is eliminated.

(c) Since the battery 6 is charged by both the first and second generators 2 and 4, when the battery 6 is over-discharged,
The burden on the first generator 2 is reduced.

(e) When the second electrical load 8 is not in use or is used at low power, the second generator 4 performs the task of charging the battery 6, and the second generator 4
The effective use of

(E) Even if one of the generators breaks down and cannot generate electricity for some reason, the other generator can charge the battery 6 and supply power to the first electrical load 5. I can do it.

Next, a second embodiment of the present invention will be explained based on FIG. 3.

In FIG. 3, reference numeral 80 indicates an ice melting device that operates at DC75V, and a switch 9 connected between the second generator 4 and the battery 6 is a movable contact 91 when the ice melting device is not in use.
is located on the battery side 92, and is switched to the ice melting device side 93 in conjunction with use. In addition, the regulator 49 of this embodiment
When the movable contact 91 of the switch 9 is on the battery side 92, the current of the excitation coil 42 is adjusted so that the generated voltage becomes the first target voltage (for example, 14V), and when the movable contact 91 of the switch 9 is on the ice melting device side 93, the generated voltage is adjusted. The current of the exciting coil 42 is adjusted so that the voltage becomes the second target voltage (for example, 75V).

In addition to the effects (A), (B), and (E) above, the vehicle power supply device B of this embodiment also has the following effects.

(f) As in this embodiment, when the second electric load is a DC load such as the ice melting device 80 and is not used, a multiple voltage power source can be easily obtained with a simple configuration.

(i) When the ice melting device 80 is not in use, the battery 6 is charged by both the first and second generators 2 and 4, so the burden on the first generator 2 is reduced. At the same time, the second generator 4 can be used effectively.

The present invention includes the following embodiments in addition to the above embodiments.

a. The first generator that is driven by a belt to generate electricity may be the other generator, and the second generator that is directly driven by the output shaft of the engine to generate electricity may be one of the generators.

b. The generated voltage of the other generator does not necessarily need to be higher than the generated voltage of one generator.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a vehicle power supply device according to a first embodiment of the present invention.

FIG. 2 is an electrical wiring diagram of the vehicle power supply device.

FIG. 3 is an electrical wiring diagram of a vehicle power supply device according to a second embodiment of the present invention.

[Explanation of symbols]

A, B Vehicle power supply device 1 In-vehicle engine (engine) 2 First generator (one generator) 3 Transmission 4 Second generator (other generator) 5 First electric load 6 Battery 8 Second electric load 11 Crankshaft (engine output shaft) 14 Belt 80 Ice melting device (second electrical load)

Claims (1)

[Claims] 1. A first generator that supplies power to a first electrical load mounted on a vehicle and charges a battery mounted on the vehicle, and a second electrical load different from the first electrical load. a second generator for supplying said first,
One of the second generators is driven by a belt connected to the output shaft of the engine, and the other generator is driven by a rotating shaft that connects the engine and a transmission driven by the engine. A vehicle power supply device characterized in that: