JPS63108419A - Power unit for vehicle - Google Patents

Abstract

PURPOSE:To activate each part without generating a fault by supplying power to an actuator from a 1st power supply and to an electronic circuit from a 2nd power supply and providing an alternator having two power generating functions so as to prevent the malfunction of the electronic circuit. CONSTITUTION:Powers are supplied from a battery 21 to the actuator 29 and from a battery 37 to the electronic circuit 36 respectively. Moreover, an electronic control unit 31 drives an inductive load 27 by a photocoupler 45. Thus, the occurrence of a low voltage at power momentary interruption, high frequency noise and the invasion of a surge are avoided. As a result, since no malfunction nor destruction is caused in the circuit 36, the reliability is improved. Since the battery 37 can be installed in a cabin, the power source wiring is much reduced. Moreover, the battery 21 is charged via the output terminal 23E of the alternate 23 and the battery 37 is charged via an output terminal 23F respectively. Thus, no hindrance is given to the operation of the actuator 29 and the circuit 36.

Description

[Detailed description of the invention] [Industrial use! I? ] The present invention relates to a power supply device for a vehicle having a plurality of batteries.

[Prior Art] Examples of conventional vehicle power supply devices include those shown in FIGS. 4 and 5, for example.

In FIG. 4, l is a battery, and the battery l is charged by an alternator 2 having a built-in voltage regulator. As shown in FIG. 5, the alternator 2 includes a filled coil 2A, a stator coil 2B, and a diode 2.
C, and has one power generation output function. 3 is a starter motor, 4 is a headlamp, a flasher lamp, a brake lamp, a room lamp, etc., 5 is a wiper motor, an air conditioner blower motor, a fuel pump motor, a power window motor, a radiator fan motor, etc., and 6 is an ignition coil. , inductive loads such as injector solenoids, door lock solenoids, alternator filled coils, and various relay coils; 7 is an electronic control unit; 8 is each sensor; 9 is an audio system such as a radio and cassette deck; 10 is an instrument panel display Each of these units is connected to a battery l via an accessory switch 11 and each wire harness 12.
Power is supplied from each. Further, reference numeral 13 denotes each ground wire connected from each unit to the negative terminal of the battery l, and each ground wire 13 is collectively connected to a body ground 14.

[Problems to be solved by this invention] However,
Such conventional vehicle power supply devices temporarily consume large currents, instantaneously lowering the power supply voltage, and reacting to surges caused by turning on and off of inductive loads, turning on and off of relay contacts, etc. Since the power supplies for actuators 3 that generate noise and noise, as well as electronic circuits such as electronic control units and audio systems that are susceptible to electrical failure due to surges and noise, are commonly connected to the same battery, low voltage
There is a problem in that the circuit of the electronic control unit is likely to be destroyed or malfunction due to surges or noise, or the hearing of the audio system may be disturbed. In order to solve these problems, the rated voltage (1
It is necessary to take measures on the circuit so that it can operate at about half of the voltage (2V), and to install surge suppression elements and noise prevention elements individually for sensors, audio systems, etc., which creates a new problem of increasing costs. .

[Means for Solving the Problems] The present invention has been made with the aim of solving the above problems, and it is a method for supplying electric power to actuators such as motors, lamps, and inductive loads. supply, l
A second battery that supplies power to the battery and electronic circuits such as the electronic control unit, sensors, audio system, and display unit, and two power generation output functions that supply power to the first battery and the second battery, respectively. The alternator is equipped with an alternator.

[Function] In the present invention having such a configuration, power is supplied to the actuators by the first battery, and power is supplied to the electronic circuits by the second battery, and the electronic circuits and the actuators are electrically connected. Because they are separated, instantaneous low voltage from the power supply that occurs in actuators,
Surges and high-frequency noises are not transmitted to electronic circuits, so there is no malfunction or destruction of electronic circuits, so reliability can be improved. Also, the first
Since the battery and the second battery are each charged by an alternator having two power generation output functions, there is no problem in the operation of the actuators and electronic circuits.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

First, to explain the configuration, in FIG. 1, 21 is the first
The first battery 21 is charged by an alternator 23 having a voltage regulator 23A. As shown in FIG. 2, the alternator 23 is connected to one filled coil 23B that generates magnetic flux in a Y-connection.
a pair of starter coils 23C in which three-phase alternating current is induced;
It is composed of a pair of diode rectifier circuits 23D that are connected to each stator coil 23C and rectify three-phase alternating current, and has two power generation output functions. That is, this alternator 23 is connected from the first output terminal 23E to the first output terminal 23E.
To Batsuteri 21.

From the second output terminal 23F to the second battery 3F, which will be described later,
Each supplies power. 24 is a starter motor, 25
are headlamps, flasher lamps, stop lamps,
Lamps such as room lamps, 26 are motors such as wiper motors and power window motors, and 27 are inductive loads such as ignition coils, injector solenoids, door lock solenoids, alternator filters, and various relay coils. , power is supplied to each power source of these actuators 29 from the first battery 21 via a wire harness 30.

On the other hand, 31 and 32 are electronic control units, 33 are sensors that send signals to the electronic control unit 31, 34 is an audio system such as a radio and cassette tape deck, and 35 is an instrument panel display circuit. Electric power is supplied from a second battery 37 to each power source of the electronic circuits 36 via a switch 38 and a wire harness 39.

Further, 40 is a ground wire connected from each actuator 29 to the negative terminal of the first battery 21, and 41 is a ground wire connected from each electronic circuit 36 to the negative terminal of the second battery 37. are collectively connected to body ground 42, respectively.

Actuators 29 by the electronic control unit 31
is driven by a light emitting diode 43 and a phototransistor 4.
The electronic circuits 36 and the actuators 29 are electrically separated. In addition, if a sealed lead-acid battery or a nickel-cadmium storage battery is used as the second battery 37, dangerous gases such as hydrogen will not be generated during charging. It is also necessary to install a second battery 37.
Since the load on the side does not require a large current in a short time like the actuators 29, it is sufficient to supply several amperes almost constantly, and the second battery 37 has a small capacity, is small and lightweight, and is sufficient. . Furthermore, since the alternator 22 may be small and have low durability, the overall cost will not be doubled even if two power generation output machine spans are provided.

Next, the effect will be explained.

Electric power is supplied to the actuators 29 from the first battery 21 and to the electronic circuits 36 from the second battery 37, respectively. Further, the electronic control unit 31 drives the inductive loads 27 via a photocoupler 45. Therefore, the instantaneous low voltage of the power supply caused by the drive of the starter motor 24 does not appear in the power supply of the electronic circuits 36, and the high frequency noise generated by the motors 26, lamps 25, and switch contacts is caused by a surge caused by the loads 27. As a result, the electronic circuits 36 are prevented from malfunctioning, destroyed, etc., and reliability can be improved. In addition, each electronic control unit 31, 32 does not need to widen the power supply voltage range of electronic circuits 36 such as sensors 33, and there is no need to provide a surge prevention element or a noise filter in the power input circuit. The increase in cost can be suppressed, and the electronic control unit 31.32
It also has the advantage of being able to maintain a high level of reliability, reducing the amount of indirect noise that enters the signal line from the source line, and making it less susceptible to reception interference. Furthermore, in the conventional example, the power wiring for each unit is individually connected to each unit in order to avoid common impedance, so the power wiring is inevitably very long. Since the second battery 37, which supplies power to the
The length can be shortened to 1/2 to 1/3, making it possible to rationalize wiring and reduce costs.

Note that the first battery 21 is charged via the first output terminal 23E of the alternator 23, and the second battery 37 is charged via the second output terminal 23F. Therefore, no malfunction occurs in the operation of the actuators 29 and the electronic circuits 36.

Next, FIG. 3 is a diagram showing another embodiment of the present invention.

In this embodiment, a solar cell is provided on the outer surface of the vehicle body in order to replenish the charge of the second battery 37 of the previous embodiment.

In FIG. 3, reference numeral 51 denotes a solar cell that generates an electromotive force by receiving sunlight, and this solar cell 51 is provided in parallel with the second battery 37. Therefore, at least the generated output of one of the alternators 23 can be sufficient to cover the power required by the electronic circuits 36. Note that the other configurations and operations are the same as those in the previous embodiment.

[Effects of the Invention] As described above, according to the present invention, the first battery supplies power to the actuators, the second battery supplies power to the electronic circuits, and the actuators are controlled by the electronic control unit. Since the drive is performed via a photocoupler, instantaneous low voltage, high frequency noise, and surges generated by the actuators are not transmitted to the electronic circuits, thereby preventing malfunction or damage to the electronic circuits. Since this does not occur, reliability can be improved. Further, there is no need to widen the power supply voltage range of the electronic circuits, and there is no need to provide surge prevention elements, noise filters, etc., so it is possible to suppress an increase in costs.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is a circuit diagram of an alternator, FIG. 3 is an overall configuration diagram showing another embodiment of the invention, and FIG. 4 is a conventional FIG. 5 is an overall configuration diagram showing the power supply device of the vehicle, and FIG. 5 is a circuit configuration diagram of the alternator. 21・・・・・・・・・First batch, 23...
・・・・・・・・・Alternator, 24.26...
...Motor neck, 25...Lamps, 28...
......Inductive loads, 29...
...Actuators, 31.32...Electronic control unit. 33......Sensors, 34...
...Audio system, 35...
・・・・・・Display unit. 36......Electronic circuits, 37...
・・・・・・・・・Second battle. Patent applicant Nissan Motor Co., Ltd. l・-1

Claims (1)

[Claims] 1. A first battery that supplies power to actuators such as motors, lamps, and inductive loads, and electronic circuits such as electronic control units, sensors, audio systems, and display units. A power supply device for a vehicle, comprising: a second battery that supplies electric power; and an alternator that has two power generation output functions for supplying electric power to the first battery and the second battery, respectively. 2. The actuators are driven by the electronic control unit via a photoelectric element, and the actuators and the electronic circuits are electrically separated. vehicle power supply.