JPH0216660B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display circuit that indicates when a battery in a large construction machine equipped with two engines is in a discharging state. Note that the battery referred to here refers to a rechargeable battery.

Normal construction machines are equipped with one engine, but large construction machines are equipped with two engines.

In such a two-engine machine, as shown in FIG. 1, a battery switch 2 and a load 13 such as a radio or lamp are connected in series to one battery 1, and the battery 1 is connected as a starting circuit for the first engine. A first starter switch 3 and a first starter 4 are connected in parallel to each other, and a second starter switch 3' and a second starter 4' as a starting circuit for the second engine are connected in parallel to each other. 1st generator 5 as a charging circuit for 1 engine
and a second generator 5' serving as a charging circuit for the second engine are mutually connected in parallel so that the first engine and the second engine can be started by the same battery 1, and the first engine and the second engine can be started by the same battery 1. The battery 1 is configured to be charged by driving the second engine.

The first and second generators 5, 5'
are equipped with regulators 7 and 7', respectively, and the B terminals (output terminals) of generators 5 and 5'
The output voltage of is input to each R terminal of the regulators 7 and 7', and this input is converted in the regulator and fed back from the F terminal to the F terminal of the generators 5 and 5', and the output voltage of the generators 5 and 5' is control to keep it almost constant.

The R terminal is provided with field relay switches FP and FP' that close when the generators 5 and 5' are in operation and open when the generators 5 and 5' are stopped.
The regulators 7 and 7' are automatically operated and stopped in accordance with the operation and stop of the regulator 5'. In addition, in the conventional example shown in Fig. 1, the outputs of the N terminals (neutral points) of the generators 5, 5' are introduced into the field relay coils FC, FC', thereby controlling the field relay switches FP, FP'. Open and close. Note that resistors R and R' are provided in parallel with the field relay switches FP and FP' to weaken the surge current generated when the field relay switches FP and FP' are opened and closed. 6 and 6' are fuses inserted at required locations in the circuit, respectively.

The display circuit that indicates that the battery is discharging consists of display means connected in parallel to the field relay switches FP and FP', and in the conventional example shown in Fig. 1, charge lamps 8 and 8' are used as the display means. are doing. That is, field relay switches FP and FP' form contacts for opening and closing short circuits of charge lamps 8 and 8'.

Next, the operation of the circuit will be explained. First, if you close the battery switch 2 and turn on the load 13, such as a radio or a lamp, without driving both the first engine and the second engine,
Current from battery 1 is applied to battery switch 2, first charge lamp 8 and second charge lamp 8', first
It reaches the L terminal of the regulator 7, and is connected from the L terminal to the E terminal via a resistor and is grounded. The same applies to the second regulator 7'.

Therefore, the charge lamps 8, 8' are lit to inform the operator that the battery 1 is being discharged. Next, when the first engine and the second engine are driven together, the first generator 5 and the second engine
Generator 5' operates together to start generating electricity,
First generator 5 and second generator 5'
At the same time, an output voltage is generated at the B terminal (power supply terminal) of the first generator 5 and the second generator 5' to charge the battery 1, and a neutral point voltage is also generated at the N terminal of the first generator 5 and the second generator 5'. 1st of 7
Current flows through the field relay coil FC and the second field relay coil FC' of the second regulator 7', and the first field relay switch FP and the second field relay switch FP' are closed. As a result, both ends of the first charge lamp 8 and the second charge lamp 8' are short-circuited, the first charge lamp 8 and the second charge lamp 8' are turned off, and the operator is notified that the battery 1 is being charged.

When the work is a light load and only one of the first engine and second engine is driven, or when the first
If either the engine or the second engine fails and only the other engine is driven,
Often only one engine is driven. In such a case, for example, if only the first engine is driven, as described above, the first generator 5 operates and charges the battery 1, and at the same time, current flows to the first field relay coil FC and the first field relay As described above, the switch FP is closed and the first charge lamp 8 is turned off to indicate that the battery 1 is being charged.However, on the other hand, since the second engine is stopped, the second generator 5' No neutral point voltage is generated at the N terminal of
Therefore, the second field relay switch FP' is in the open state, and current flows through the second charge lamp 8'.
The second charge lamp 8' lights up to indicate that the battery 1 is being discharged. For this reason, when either the first engine or the second engine is driven, one of the charge lamps lights up to indicate that it is discharging, even though battery 1 is being charged. However, there is a problem in that only the other charge lamp is turned off to indicate the charging status, and the display is very confusing.

The present invention aims to improve the problems of the prior art as described above.

The basic idea of the present invention is to remove one of the charge lamps 8' (or 8) in the conventional example shown in FIG. The idea is to use the same circuit as the conventional one for the regulator and also serve as a charge lamp. However, if you simply do the above, one field relay switch FP or
When FP' is closed, there is a short circuit from its L terminal to the other L terminal, so current flows into the other regulator, causing a fault in the regulator. For this reason, the present invention inserts a diode to prevent the L terminals from being short-circuited, and accordingly, one side of the circuit of the display means (charge lamp) is grounded via a resistor to ground the current without going through the regulator. This is what was resolved.

Hereinafter, one embodiment of the battery discharge state display device of the present invention will be described with reference to FIG.

In the figure, the same reference numerals as in FIG. 1 indicate the same parts.

Accordingly, in this embodiment, the display circuit for displaying the discharging state of the battery of the present invention has a charge lamp 80 and a resistor 11 connected in series to the battery 1 and the battery switch 2. , forming a closed circuit of resistor 11. A first field relay switch FP and a second field relay switch FP' are connected in parallel to the charge lamp 80 via a first diode 10 and a second diode 10', respectively. These first and second diodes 10, 10'
The cathode is connected to the resistor 11 side so that current is allowed only in the direction of ground through the resistor 11.

The battery discharge state display circuit of the present invention has the above-described configuration, and its operation will be explained below.

First, when the battery switch 2 is closed and the radio or lamp of the load 13 is turned on without driving the first engine and the second engine, the current from the battery 1 is transferred to the battery switch 2, the charge lamp 80, and the resistor 11. The charge lamp 80 lights up to inform the operator that the battery 1 is being used (discharging).

Next, when the first engine and the second engine are both driven, the first generator 5 and the second generator 5' operate to start generating electricity, and the voltage is applied to the B terminals of the first generator 5 and the second generator 5'. occurs and charges battery 1, and at the same time,
First generator 5 and second generator 5'
A neutral point voltage is also generated at the N terminal of the
1st field relay coil of regulator 7
Current flows through FC and the second field relay coil FC' of the second regulator 7', and the first field relay switch FP and the second field relay switch FP' are closed. Then, the current is grounded through the first field relay switch FP and the second field relay switch FP', the first diode 10 and the second diode 10', and the resistor 11. Therefore, the potential difference (voltage) across the charge lamp 80 is about the forward voltage drop (approximately 0.5V) of the diodes 10 and 10', so the charge lamp 80 does not light up and the operator can tell that the battery 1 is being charged. Let me know.

Then, if either the first engine or the second engine is driven, for example, only the first engine is driven,
As mentioned above, at the same time that the first generator 5 operates to charge the battery 1, current flows through the first field relay coil FC and closes the first field relay switch FP. Then, the current is grounded through the first field relay switch FP, the first diode 10, and the resistor 11 as described above. Therefore, similarly to the above, the potential difference between both ends of the charge lamp 80 becomes low, and the charge lamp 80 does not turn on, thereby notifying the operator that the battery 1 is being charged. At this time, since the second generator 5' is not operating, the second field relay switch FP' is open, and a large potential difference is generated between the R terminal and the L terminal. Therefore, a large potential difference also occurs between the L terminal of the first regulator 7 and the L terminal of the second regulator 7', but since the current is blocked by the diode 10', the first
No current passing through the regulator will flow to the second regulator.

As described above, when the first engine and the second engine are not being driven and the battery 1 is being used, the charge lamp 80 is lit to indicate that the battery 1 is being discharged. On the other hand, when the first engine and the second engine are operating and the battery 1 is being charged, the charge lamp 80 is turned off to indicate that the battery 1 is being charged. Also, when either the first engine or the second engine is running and the battery 1 is being charged,
Similarly, the charge lamp 80 is turned off to indicate that the battery 1 is being charged, so when the battery 1 is being discharged, the charge lamp 80 is turned on, and when the battery 1 is being charged, the charge lamp 80 is turned off. It can perform the original function of a status display circuit, and the discharge status and charging status of the battery can be easily and clearly distinguished in the same manner as in single-engine aircraft.

As described above, the display circuit in the two-engine machine of the present invention is configured to display the discharging state and charging state of the battery using one display means, so that it displays the discharging state of the battery. The display circuit can perform the original function of the display circuit, and even when only one engine is being driven, there will be no interference with the regulator of the other generator.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a battery discharge state display circuit in a conventional two-engine machine, and Fig. 2 is a circuit diagram of a battery discharging state display circuit in a conventional two-engine machine.
FIG. 2 is a circuit diagram showing an embodiment of a battery discharge state display circuit in an engine-equipped machine. 1...Battery, 2...Battery switch, 5...First
Generator, 5'...Second generator, 7...
...first regulator, 7'...second regulator,
80... Charge lamp, 10... First diode, 10'... Second diode, 11... Resistor,
FC...First field relay coil, FC'...Second field relay coil, FP...First field relay switch, FP'...Second field relay switch.

Claims (1)

[Claims] 1. Each of the two engines is equipped with a generator, and the output side of the generator is connected to the anode side of one battery, and each of the generators has a regulator, and each regulator is connected to the output side of the respective generator. It is configured to input a voltage to the R terminal and output feedback to the F terminal of each generator, and
A field relay switch is inserted into the R terminal of each of the above-mentioned regulators, and the input side of one display means for indicating that the battery is discharging is connected to the R terminal on both sides. A short circuit is provided in parallel with the display means, connected to the terminal and the other side of the display means is grounded via a resistor, and shorted through the respective field relay switches, and each of the short circuits is connected to the other side of the display means. A battery discharge state display circuit for a two-engine machine, characterized in that a diode is inserted to block current flowing toward a regulator.