JPS6225379Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for driving a vehicular load by operating a switch, and more particularly, to a vehicular load drive device that appropriately prevents battery discharge.

FIG. 1 shows a conventional example of a load drive device for a vehicle.
Reference numeral 1 denotes a power supply switch for a vehicle load indicated by reference numeral 3, and 5 a power supply relay that is excited when the power supply switch 1 is in an on state and supplies a drive current to the vehicle load 3. In operation, when the power supply switch 1 is turned on, the power supply relay 5 is turned on, a drive current is supplied to the vehicle load 3, and the load 3 starts driving. When it is desired to stop driving the vehicle load 3, the power supply relay 5 is turned off by turning off the power supply switch 1, and the supply of drive current to the vehicle load 3 is stopped. 3 stops.

The above configuration is well known as a vehicle load drive device, and a stable supply of drive current to the vehicle load is achieved by manually operating a power supply switch. On the other hand, for example, on a rainy night,
Power consumption is 60W when the dimer is on or when the main light is on.
When driving a headlamp and air conditioner that require 150W, the amount of power supplied by the alternator is approximately 120W when the engine is running at low speed when the vehicle is stopped, so the battery becomes discharged and the headlamp is manually operated. The battery will continue to be discharged unless you turn off the power supply switch of the air conditioner, so if you notice the discharge with an ammeter, etc.,
It is time-consuming to turn off the power supply switch according to the manual, and if the user does not notice the discharge state, it may cause the battery to run out.

Although it is possible to maintain the charged state of the battery by increasing the amount of power generated by the alternator by increasing the engine speed, this results in unnecessary fuel consumption and is uneconomical.

Therefore, for vehicle loads that consume large amounts of power, such as headlamps, air conditioning systems, wipers, and heated rear windows, when the vehicle is not running,
When the battery is in a discharged state, it is necessary to stop the drive or switch the drive state to prevent the battery from discharging.

However, in order to prevent the battery from discharging, the occupant must monitor the charging or discharging state of the battery while the vehicle is stopped, and as a result of this monitoring, the battery may be in a discharged state. In this case, it is necessary to turn off the power supply switches of the vehicle loads that are being driven and consume a large amount of power, and as a result, there is a problem in that it is not possible to appropriately prevent battery discharge.

This idea was made in view of the above, and in order to ensure the prevention of battery overflow, when the vehicle stops driving and the battery is in a discharged state, driving of a predetermined vehicle load that consumes a large amount of power is stopped. This is how it was done.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 2 shows an embodiment of this invention, which is characterized by a running stop detection section 7 that detects when the vehicle stops running, and a discharge state detection section 9 that detects the discharge state of the battery.
And, when the vehicle is stopped and the battery is in a discharged state, a drive stop means 11 is provided which stops a predetermined vehicle load that consumes a large amount of power, for example, indicated by reference numeral 3. Note that the same reference numerals as in FIG. 1 indicate the same parts.

The running stop detection section 7 detects the vehicle speed and applies an electric signal to the drive stopping means 11 while the vehicle is stopped running.

The discharge state detection unit 9 is configured to determine charging and discharging, for example, by measuring the terminal voltage of each vehicle load, and applies an electric signal to the drive stop means 11 during the discharge state. .

The drive stop means 11 outputs a pulse signal 13 when electric signals from the running stop detection section 7 and the discharge state detection section 9 are simultaneously input, for example.
This configuration includes an AND circuit 15 and a grounded-emitter transistor 19 that maintains conduction while the signal 13 is supplied via a resistor 17. Note that the collector terminal of the transistor 19 is connected to the resistor 2.
1 to the power supply switch 1. Therefore, when the transistor 19 is conductive, the current flowing in the power supply relay 5 flows into the transistor 19 through the resistor 21, and the power supply relay 5
No current flows through, and the driving of the vehicle load 3 stops.

FIG. 3 shows each output signal waveform of the embodiment shown in FIG. In the detection status of the terminal voltage Vtotal and the discharge state, if it is less than the threshold value indicated by the reference symbol V _T , it indicates the discharge state, B-2 is the output signal of the discharge state detection section 9, and C is the output of the AND circuit 15. The signal D indicates the conduction state of the transistor 19, and the signal E indicates the conduction state of the power supply relay 5.

Next, the operation of this embodiment will be explained with reference to the drawings described above.

When the vehicle stops running, the output signal of the running stop detection section 7 becomes ON as shown in FIG. 3A.
It is applied to the AND circuit 15. On the other hand, the discharge state detection section 9 detects the discharge state indicated by the reference symbol DH as shown in FIG. 3B-1, and as a result, the output of the detection section 9 is as shown in FIG. 3B-2. The signal becomes ON and is applied to the AND circuit 15. In the AND circuit 15, a pulse signal 13 as shown in FIG. 19 base terminal. As shown in FIG. 3D, the transistor 19 is conductive only while the pulse signal 13 is ON, so the current flowing in the power supply relay 5 flows into the transistor 19, and as a result, as shown in FIG. As shown in E, the driving state of the power supply relay 5 is turned OFF, and the driving of the vehicle load 3 is stopped. Note that when the vehicle starts running, the output signal of the running stop detection section 7 is turned off, so that the transistor 19 becomes non-conductive, and the vehicle load 3
The drive starts automatically, so it has no effect on normal driving. In addition, in the above embodiment, in order to simplify the explanation, the power supply switch, power supply relay, and vehicle load were set as one set, but the vehicle load drive device of this invention can be applied even if there are multiple sets. Needless to say.

According to the above configuration, the drive of a predetermined vehicle load is automatically stopped by detecting the stoppage of the vehicle and the discharge state, thereby preventing wasteful use of fuel and saving time and effort. The vehicle load can be driven in response to changes in conditions, and battery discharge can be prevented.

As explained above, according to this invention, when the vehicle stops running and the battery is in a discharged state, driving of a predetermined vehicle load that consumes a large amount of power is stopped, thereby preventing the battery from running out. can be ensured.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example of a vehicle load drive device, and FIG. 2 shows an example of a vehicle load drive device according to this invention.
FIG. 3 shows signal waveforms showing the operation of the embodiment shown in FIG. Explanation of the symbols representing the main parts of the figure, 7... Running stop detection section, 9... Discharge state detection section, 11...
Drive stop means.

Claims (1)

[Scope of utility model registration request] A running stop detection unit detects and outputs when the vehicle stops running; a discharge state detecting unit detects and outputs the discharge state of the battery; and when the running stop detecting unit and the discharge state detecting unit output, a predetermined signal is detected. 1. A vehicle load drive device comprising: drive stop means for stopping driving of the load by means of a switch means provided in a power supply circuit of the vehicle load.