JPH03226239A - Battery charging and discharging indicating circuit in vehicle equipped with two engines - Google Patents

Abstract

PURPOSE:To alarm an operator the insufficient condition of charging by a method wherein a contact, opened upon operating a first charging and/or discharging indicating relay, and another contact, opened upon operating a second charging and/or discharging indicating relay, are connected in a charge lamp circuit in parallel to each other and in series to a charge lamp. CONSTITUTION:When a second generator 5' becomes faulty during operating a first engine or during operating both engines, a first generator 5 is operated and current is conducted through the coil RC of a first charging and/or discharging indicating relay 12 whereby the contact RP of the relay is opened. In this case, the second generator 5' is not operated and, therefore, the contact RP' of a second charging and/or discharging indicating relay is closed. Then, current, conducted through a charge lamp 8, is made to flow through an earth through the contact RP' of the relay and, therefore, the charge lamp 8 is lighted to inform an operator that a battery 1 is in the insufficient condition of charging.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a display circuit that displays the charging and discharging states of a battery in a large construction machine or the like equipped with two engines. . The term battery here refers to a rechargeable battery.

[Conventional technology]

Large construction machines equipped with two engines are equipped with one battery to supply power to the load and to start the engine when the engine is stopped, and a generator installed in each of the two engines when the engine is running. The battery is charged.

JP-A-58-15170 describes two examples of battery charge/discharge display circuits for such two-engine aircraft (hereinafter referred to as
First and second conventional examples) are shown.

In the first conventional example, first and second generators are connected in parallel to field relay contacts built in first and second regulators that adjust the voltages of the first and second generators, respectively.
and a second charge lamp are connected, and the field relay contacts are used as contacts for opening and closing short circuits of the respective charge lamps. In this display circuit, when both engines are running and charging the battery, the first and second charge lamps are turned off to indicate the charging status, and both engines are stopped and the battery supplies power to the load. When the battery is being discharged, the first and second charge lamps are lit to indicate the discharge status.

The second conventional example uses only one charge lamp and has a circuit configuration as shown in FIG. In FIG. 2, a load 13 such as a radio and a lamp is connected to the battery 1 via a battery switch 2, and a first starter switch 3 and a first starter 4 are connected to the battery 1 for starting the first engine, and a first starter switch 3 and a first starter 4 are connected to the battery 1 for starting the second engine. A second starter switch 3' and a second starter 4' are connected in parallel with each other.

A first generator 5 provided in the first engine and a second generator 5 provided in the second engine as a charging device for the battery 1.
' has a B terminal (output terminal) connected in parallel to the anode side of the battery 1 via the battery switch 2, and an E terminal connected to the ground. The generator 5.5' is a known alternating current generator with a built-in rectifier, and is provided with first and second regulators 7.7' for voltage regulation. The output voltage from the B terminals of the generators 5, 5' is also input to the R terminal of the regulator 7.7', and this input is applied to the well-known intermittent contact voltage regulating mechanism parts VR, 7' of the regulator 7.7'.
It is converted by VR' and fed back from each F terminal to the F terminal of the generator 5.5', and is controlled to keep the output voltage of the generators 5 and 5' substantially constant.

R terminal of regulator 7.7' and voltage adjustment mechanism VR,
Field relay contacts FP and FP' are connected to VR' and are closed when the generators 5 and 5' are in operation, and open when they are stopped.
is connected, and the regulator 7.7' is activated or stopped in response to activation or deactivation of the generator 5.5'. The regulator 7.7' has built-in field relay coils FC, FC' which are activated by the output of the N terminal (neutral point) of the generators 5, 5'. Opens and closes relay contacts FP and FP'. In addition,
R,,R,' are contacts FP and F to absorb switching surges.
The resistor 6°6' connected in parallel with P' is a fuse inserted at a key point in the circuit.

In this conventional example, one charge lamp 8 and one resistor are connected in series to the battery 1 and battery switch 2, the other end of the resistor 11 is grounded, and the field relay contacts FP and FP' are connected to the charge lamp 8. Diode 10.10' each
A display circuit is formed by connecting the battery 1 in parallel through the battery 1 to display the charging and discharging states of the battery 1. In this display circuit, when the first engine and the second engine are stopped, the battery switch 2 is closed, and power is being supplied from the battery 1 to the load 13, the charge lamp 8 lights up to indicate that the battery 1 is discharging. Show status. Meanwhile, the first engine and the second
When the engine is running and battery 1 is being charged, charge lamp 8 indicates field relay contacts FP and F.
It is short-circuited by P' and goes out, indicating that the battery 1 is being charged. Furthermore, even when only one of the first engine and the second engine is operating and charging the battery 1,
Charge lamp 8 is field relay contact FP or F
It is short-circuited by P' and goes out, indicating that the battery 1 is being charged.

Note that the diodes 10 and 10' in the above display circuit prevent current from flowing from the inlet terminal of the operating regulator to the inlet terminal of the stopped regulator when only one engine is running, causing damage. It was inserted to prevent

[Problem to be solved by the invention]

For machines equipped with two engines, if the work is light and only one of the first or second engines is operated, or if one of the first or second engines breaks down, the remaining There are many cases where only one engine is operated, such as when only one engine is operated. In a system in which each of the two engines is equipped with a charge lamp, as in the first conventional example, when only one engine is operated, one charge lamp turns off to indicate the charging status, and the other Since the charge lamp lights up to indicate the discharge status, there is a problem in that the display is confusing for the operator.

The second conventional example is an attempt to solve the above problem.
Unlike the conventional example, the charge lamp 8 does not light up even if only one engine is operating, and displays the charging status. However, in a machine where the capacity of the load 13 is large, the battery 1 will not be sufficiently charged by charging only by the generator of one engine, and if this state continues for a long time, the battery 1 will be exhausted, and in the worst case, the battery 1 will be The battery becomes completely discharged (depleted) and the engine cannot be started.

Also, even if both engines are running, one of the generators may fail and not charge.
Even when only one generator is operating, the charge lamp 8 does not light up, so the operator assumes that the generator is being charged normally without realizing that the generator is malfunctioning, even though the battery is not fully charged. This may lead to the worst situation described above.

In order to eliminate the above-mentioned problems, the present invention combines the charging and discharging states of the battery in a two-engine aircraft into one.
clearly indicates the charge lamp and alerts the operator that the battery is undercharged when only one engine is running and when one generator has failed and is not charging. The purpose is to provide a functional battery charge/discharge display circuit.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a first charge/discharge display relay that is activated by the charging voltage of the battery, and a second charge/discharge display relay that is activated by the voltage generated when the second generator generates electricity. , the charge lamp is connected in series with a battery and a battery switch; and in the circuit of this charge lamp, there are contacts that open when the first charge/discharge display relay is activated and a contact that opens when the second charge/discharge display relay is activated. The contacts that open are connected in parallel with each other and in series with the charge lamp.

[Effect]

The first and second charge/discharge display relays are connected to the first and second charge/discharge display relays.
When the generator starts generating electricity, the respective contacts are opened, and when the first and second generators stop generating electricity, the respective contacts are closed. In addition, since the contacts of the first and second charge/discharge display relays are connected in parallel with each other and in series with the charge lamp, when at least one contact is closed, this contact is Current flows through the charge lamp.

Therefore, when both engines are not running and the batteries are supplying power to the load, the charge lamp will illuminate to indicate the discharging condition, and both engines will be running to draw the batteries from their respective generators. When charging,
The charge lamp turns off to indicate charging status. Also, if only one engine is running, or if both engines are running but one generator is malfunctioning, the charge lamp will light up and the battery will not be fully charged. Alert the operator that something is happening. Of course, the charge light will also come on if both engines are running and both generators are faulty.

〔Example〕

An embodiment of the present invention is shown in FIG. In FIG. 1, a battery 1, a battery switch 2, a load 13, a starter switch 3
．． 3', starter 4.4', generator 5.5', regulator T, 1', and fuse 6.6' are the same as in the conventional example shown in FIG. Hereinafter, a configuration different from the conventional example will be explained.

One charge lamp 8 is connected in series to the battery 1 and the battery switch 2, and a first
The d terminal of the charge/discharge display relay 12 and the d' terminal of the second charge/discharge display relay 12' are connected in parallel. The a terminal and C terminal of the first charge/discharge display relay 12 and the a' terminal and a' terminal of the second charge/discharge display relay 12' are respectively connected to ground. Further, the N terminal of the first regulator 7 and the b terminal of the first charge/discharge display relay 12 are connected in parallel to the N terminal of the first generator 5, and the N terminal of the second regulator 7 is connected to the N terminal of the second generator 5'. The N terminal of ' and the b' terminal of the second charge/discharge display relay 12' are connected in parallel. The first charge/discharge display relay 12 has a relay contact RP connected between both terminals a and d, and a relay coil RC connected between both terminals c. It has a relay contact RP' connected between both terminals ad' and a relay coil RC' connected between both terminals bt and cr. Relay contacts RP and RP' are normally closed contacts that open when relay coils RC and RC' are energized (when relay 12.12' is activated), respectively.

As described above, the battery charge/discharge display circuit of the present invention includes one charge lamp 8 and a first charge/discharge display circuit which is operated by the voltage (neutral point voltage in this example) generated when the first generator 5 generates electricity. The relay 12 is equipped with a second charge/discharge display relay 12' that is activated by the voltage (same as above) generated when the second generator 5' generates electricity, and when the first charge/discharge display relay 12 is activated during the circuit of the charge lamp 8. Contact RP that opens
and a contact RP' which is opened when the second charge/discharge display relay 12' is activated are connected in parallel with each other and in series with the charge lamp 8.

Here, the regulator 7.7' is connected to the generator 5, 5.
It is used only for the original purpose of controlling the generated voltage at a constant level, and is not used for the battery charge/discharge display circuit.

The operation of the display circuit according to the present invention will be explained below with reference to FIG.

First, when the battery switch 2 is closed without operating the first engine and the second engine and the radio of the load 13 is operated or the lamp is turned on, the current from the battery I is transferred to the battery switch 2, the fuse 6, and the charge lamp. 8. d terminal of first charge/discharge display relay 12, relay contact R in closed state
It flows to ground via the P and a terminals. Similarly, on the second charge/discharge display relay 12' side, the current passing through the charge lamp 8 is connected to the d' terminal, the relay contact RP' in the closed state, and the a
' flows to ground through the terminal. Therefore, the charge lamp 8 lights up to notify the operator that the battery 1 is being used (discharged).

Next, when both the first engine and the second engine are operated, the first generator 5 and the second generator 5' are normally operated and start generating electricity, and voltage is generated at each B terminal and the battery 1 At the same time, a neutral point voltage is generated at each N terminal, and as a result, the relay coil RC of the first charge/discharge display relay 12 and the relay coil RC' of the second charge/discharge display relay 12' are charged. Current flows and relay contacts RP and RP' open. Then, the first charge/discharge display relay 12N and the second charge/discharge display relay 12'
Since the circuits of the charge lamps 8 on both sides are open, the charge lamps 8 do not light up, indicating to the operator that the battery 1 is being charged by both generators 5, 5'.

Next, we will discuss cases where charging is insufficient, such as when only one of the first engine and second engine is operated, or when either one of the generators fails while both engines are operating.

For example, if only the first engine is operated, or if only the second generator 5' fails while both engines are in operation, the first generator 5 will operate as described above, and its neutral point voltage will increase. As a result, current flows through the relay coil RC of the first charge/discharge display relay 12, and the relay contact RP
opens. At this time, since the second generator 5' is not operating, no current flows through the relay coil RC' of the second charge/discharge display relay 12', and the relay contact RP' is in a closed state. Then, the current passing through charge lamp 8 flows to ground via relay contact RP', so charge lamp 8 lights up, indicating that battery 1 is insufficiently charged, and if both engines are running. Informs the operator that one of the generators has failed.

When only the second engine is operated, the first generator 5
The same applies if only one part breaks down.

〔Effect of the invention〕 According to the present invention, there are the following effects.

In other words, when only one of the first engine and second engine is operating, the muco charge lamp lights up to notify the operator that the battery is not fully charged, and to alert the operator that the battery is not fully charged. If both the engine and the second engine are running and either the first generator or the second generator fails, the charge lamp will light up and one of the generators will fail and need to be inspected. Since the charge lamp does not light up when only one engine is running as in the second conventional example, or when one generator is malfunctioning and is not charging, the operator can It is possible to prevent situations such as a dead battery from not being noticed when the battery is insufficiently charged.

Furthermore, since a single charge lamp can indicate the failure of two generators, the installation space for the charge lamp is the same as in the conventional example above, and unlike the first conventional example, only one engine is required to be installed. When in operation, one charge lamp lights up and the other charge lamp goes off, making the display unmistakable.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional example. ■... Battery, 2... Battery switch, 5... First generator, 5'... Second generator, 8... Charge lamp, 12... First charge/discharge display relay, 1
2'...Second charge/discharge display relay, RC, RC'...
・Relay coil, RP, RP'...Relay contact.

Claims (1)

[Claims] 1. Connect the output sides of the first generator for the first engine and the second generator for the second engine to 1.
In a two-engine machine connected to the anode side of two batteries via a battery switch, there is one charge lamp that displays the charging and discharging status of the battery, and the voltage generated when the first generator generates electricity. a first charge/discharge display relay that is activated by the second generator, and a second charge/discharge display relay that is activated by the voltage generated during power generation by the second generator;
The charge lamp is connected in series with a battery and a battery switch, and in the circuit of the charge lamp, there are contacts that open when the first charge/discharge display relay is activated and contacts that open when the second charge/discharge display relay is activated. A battery charge/discharge display circuit for a two-engine machine, characterized in that contacts are connected in parallel with each other and in series with the charge lamp.