JP2503272B2 - Vehicle charging device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle charging device, and more particularly to a charger connected to a running engine (hereinafter referred to as a running engine) and an engine for a cooler. The present invention relates to a charging device including a charger connected to a vehicle (hereinafter referred to as a cooler engine), which is suitable for a large vehicle such as a bus so that an on-vehicle battery is charged by both of the chargers.

[Conventional technology]

Conventionally, as this type of vehicle charging device, for example, the second
The configuration shown in the figure is known. This charging device was implemented on a bus equipped with a cooler.

To explain this in detail, in FIG. 2, 2 and 4 are respectively
It is a key switch for starting the running engine and the cooler engine (both are diesel engines). These key switches 2 and 4 are "B", "AC", "R ₁ ", and
It consists of a manual glow type having a respective terminal of the "C" and "R _2, as shown in FIG. 3," GLOW "at the position" B "-
"R ₁ " is connected, "B"-"Ac" is connected in the "ON" position, and "B"-"Ac"-"R ₂ "-is connected in the "ST" position.
The "C" s are connected to each other.

Of these, the key switch 2 on the running engine side is B
The terminal is "B" of the alternator 6 as the first charger,
The Ac terminal is connected to the “S” terminal, and the Ac terminal is connected to the “L” terminal of the alternator 6 via the charging warning light 8. Further, the R ₁ and R ₂ terminals of the key switch 2 are both connected to the glow plugs 12, ..., 12 of the running engine via the glow pilot lamp 10, and the C terminal is connected to the starter motor 14 for starting the running engine. The minus terminal is connected to the plus terminal of the vehicle-mounted battery 16 which is grounded.

The alternator 6 is driven by being connected to a running engine and has a built-in IC regulator, which is a well-known AC generator (eg, Yuji Tanaka, et al., Published by Meishen Co., Ltd., p. 128). , Figure 4.91). The S terminal of the alternator 6 is connected to the plus terminal of the vehicle battery 16, and the E terminal is connected to the ground.

The charging and starting circuit for the running engine is constructed as described above.

On the other hand, the charging and starting circuit on the cooler engine side is the same as the circuit on the running engine side. That is, the B terminal of the key switch 4 is the B and S terminals of the alternator 18 and the positive terminal of the battery 16, the Ac terminal of the key switch 4 is the L terminal of the alternator 18 via the charging warning light 20, and the R switch of the key switch 4 is R. ₁ , R ₂ terminals are connected via glow pilot lamps 22 to glow plugs 24, ..., 24 of the cooler engine, respectively. Further, the C terminal of the key switch 4 reaches the battery 16 via the starter motor 26 that starts the cooler engine. The alternator 18 has the same structure as the alternator 6 on the running engine side described above.
The cooler engine operates the cooler equipment installed on the bus.

Therefore, the key switch 2 on the running engine side is set to "GLO
When in the W position, the battery 16 and glow plug 12,
, 12, the glow pilot lamp 10 is lit by being energized by the battery 16, and preheating by the glow plugs 12 ,.

When the key switch 2 is operated to the “Ac” position, the battery 16, the key switch 2, the charging warning light 8, the alternator 6
The charging warning lamp 8 is turned on by energizing it via the L terminal.
After that, if you operate the key switch 2 to the "ST" position,
The starter motor 14 is energized from the battery 16 to
The running engine is started by being urged by the rotation of 14. As the rotational speed of the running engine increases, the voltage generated by the alternator 6 also increases, and when the generated voltage exceeds the battery voltage, power is supplied to the load side and the battery 16 through the "B" terminal, which causes The battery 16 is charged. In this state, since the "B" and "L" terminals have the same potential, the charging warning lamp 8 is turned off. Further, when the voltage between the "S" and "E" terminals of the alternator 6 exceeds or falls below the specified range, the regulator of the alternator 6 adjusts the output voltage to a value within the specified range.

On the other hand, the procedure for operating the key switch 4 on the cooler engine side is the same as that described above. That is, preheating is performed by the glow plug 24 at the “GLOW” position of the key switch 4, the charging warning light 20 is turned on at the “ON” position, and “ST” is displayed.
At the position, the starter motor 26 rotates and the cooler engine rotates. When this cooler engine is in full explosion,
While the charging warning light 20 is turned off, the cooler starts its operation as the cooler engine rotates.

[Problems to be Solved by the Invention]

However, in such a conventional vehicle charging device, the alternator 6 on the engine side charges the battery 16 when the traveling engine is in operation, so that it is not necessary to charge the alternator 18 on the cooler engine side. Instead, when the cooler is operated while the traveling engine is operating, the alternator 6, 18 on both the traveling engine side and the cooler engine side always charges the battery 16, so that a wasteful charging load is generated. Therefore, there is a problem that the fuel consumption becomes worse and the noise becomes louder. In addition, when the cooler engine is started, a charging load is applied to the engine, so that the engine output may decrease, the rotation speed may become large, or the engine may stall, resulting in unstable starting. There was also.

The present invention has been made by paying attention to the problem of such a conventional device. When the traveling engine is in operation, the battery is charged only by the alternator 6 on the engine side, and charging by the alternator on the cooler engine side is performed. The problem to be solved is to secure a stable start of the cooler engine and reduce the load on the cooler engine by stopping the operation.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a first charger that charges a battery by driving a running engine and a second charger that charges a battery by driving a cooler engine.
And a charger for a vehicle, comprising:
The charging / discharging circuit between the battery charger and the battery is provided with an opening / closing control unit that shuts off the charging circuit when the traveling engine is in an operating state and connects it when the traveling engine is in a stopped state.

[Action]

In the present invention, when the traveling engine is driven, the first charger is also activated in response to this, and the battery is charged. In this state, since the opening / closing control means shuts off the charging circuit for the battery on the cooler engine side, the engine load at the time of starting the cooler engine is reduced and a stable start is performed as much as the charging load is not applied to the cooler engine. The fuel efficiency of the cooler engine is also improved. on the other hand,
When the running engine is in the stopped state, the opening / closing control means brings the charging circuit into the conducting state, so that the charging circuit by the second charger is formed. The battery can be charged by driving the cooler engine in this state.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. This embodiment shows a charging device applied to a bus similarly to the above-mentioned conventional example, and the same components as those in FIG. 2 are designated by the same reference numerals.

In FIG. 1, reference numeral 30 indicates a relay as an opening / closing control means. The relay 30 includes a coil portion 30A and a coil portion 3A.
Normally closed (NC) contact that closes when 0A is demagnetized
Composed of 30B. The coil portion 30A is connected between the Ac terminal of the starter switch 2 on the running engine side and the ground, and the contact point 30B is the alternator 18 on the cooler engine side.
It is inserted in the middle of the charging circuit CG between the B terminal of the (second charger) and the battery 16.

 The other structure is the same as that of FIG.

 Next, the operation of this embodiment will be described.

When the starter switch 2 on the running engine side is in the "OFF" position, the running engine is also stopped and the "B-Ac" terminal of the switch 2 is cut off, so the coil portion 30A of the relay 30 is also demagnetized. Is in a state. Therefore, the relay contact 30B is in the “closed” state (ON), and the charging circuit CG is conducting. Therefore, by operating the starter switch 4 on the cooler engine side, the cooler engine can be driven as in the above-described conventional example, and the bus cooler can be operated at any timing. At the same time, the battery 16 is charged only by the electric power generated by the alternator 18 on the cooler engine side.

On the other hand, if only the starter switch 2 on the running engine side is operated from the "OFF" position to the "ON" or "ST" position,
At least conduction is established between the "B-Ac" terminals. As a result, a closed circuit is formed between the battery 16 or the alternator 6 and the coil portion 30A of the relay 30.
Current flows through. As a result, the coil portion 30A is excited, the contact point 30B is switched from the previously closed state to the open state (off), and the charging circuit CG is cut off. When the running engine is driven in this cutoff state, only the alternator 6 charges the battery 16.

However, even when the cooler engine is driven as described above in the running state of the traveling engine, the battery 16 is charged only by the alternator 6 on the traveling engine side even when the cooler engine is driven as described above. The alternator 18 is released from charging.

The above operation is summarized according to the engine operation pattern, alternator operation status, and engine charging load as shown in Table 1 below. The other operations are the same as in the conventional example.

That is, in the state of the engine operation pattern in Table 1 above, since the charging load is not applied to the alternator 18, the load of the cooler engine is correspondingly reduced, and the fuel efficiency of the cooler engine is significantly improved. Further, the noise of the cooler engine is reduced and the durability of the engine is improved as compared with the conventional case.

Further, when the cooler engine is started when the charging circuit CG is in the cutoff state, that is, the running engine is in the operating state, the engine load is reduced, so the fluctuation in the number of revolutions at the time of starting is also small and the engine stall is also reduced. Good starting characteristics are obtained.

In the above embodiment, a relay having a normally-closed contact is used to open and close the charging circuit, but the opening / closing control means of the present invention is not necessarily limited to this. For example, a switching element such as a thyristor is used, This element is on
It is also possible to provide an analog electronic circuit for controlling the OFF by being biased to the terminal position of the starter switch 2.

〔The invention's effect〕

As described above, according to the present invention, the charging circuit between the second charger and the battery is cut off when the running engine is in the operating state, and therefore when the running engine is in the operating state. Since the second charger on the cooler engine side does not participate in battery charging, the conventional waste of the first and second chargers charging the battery at the same time is eliminated, and the load on the cooler engine is reduced accordingly. Fuel efficiency is greatly improved, and it also contributes to noise reduction and durability improvement of the cooler engine, and when starting the cooler engine while the running engine is running, the cooler engine is charged by the charging load. Since the load on the cooler engine has been reduced, there is an effect that the start of the cooler engine becomes more stable.

[Brief description of drawings]

FIG. 1 is a partially block circuit diagram showing an embodiment of the present invention, FIG. 2 is a partially block circuit diagram showing a conventional example, and FIG. 3 shows a key position and a terminal connection relationship of a key switch. It is an explanatory view shown. In the figure, 2 is a key switch on the running engine side, 4 is a key switch on the cooler engine side, 6 is an alternator as a first charger, 16 is a battery, 18 is an alternator as a second charger, and 30 is an opening / closing Relay as control means,
CG is a charging circuit.

Claims (1)

(57) [Claims] 1. A vehicle charging device comprising: a first charger that charges a battery by driving a running engine; and a second charger that charges the battery by driving a cooler engine. A charging circuit between the charger and the battery,
A vehicle charging device, comprising: an opening / closing control unit that shuts off the running engine when the running engine is in a running state, and connects the running engine when the running engine is in a stopped state.