JPS60211377A - Source voltage drop warning device for vehicle - Google Patents

Abstract

PURPOSE:To prevent preliminarily the battery of an automobile from being consumed excessively during the stop of an engine without providing any extra display device by annunciating a drop in the battery voltage on a display device that on-vehicle radio equipment has originally. CONSTITUTION:When the current voltage value is higher than the set value is memory, the current voltage value is displayed at part of the display part 8, which is thus used even as a voltmeter. When this detected current voltage value is lower than the set value, the current voltage values displayed at group code digits of the display part 8 is flashed to let a user know that the consumption of the battery is large. For the purpose, a slightly higher set value is inputted and then a preliminary warning is generated when the personal radio equipment operates normally. If a warning is generated on the basis of this set value, the engine is started to charge the battery or stop radio communication, preventing the consumption of the battery. In this case, the personal radio equipment is equipped with a switch part 7 having a ten-key initially, so the set value is easily varied.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a vehicular power supply voltage drop warning device that issues an alarm in response to a drop in vehicle power supply voltage using an indicator installed in an on-vehicle radio.

Prior Art and Problems In recent years, in-vehicle radios have become popular, but these radios consume a large amount of power during transmission, so if you communicate for a long time with the car's engine stopped, the battery will drain.
The voltage may drop, causing the radio to go out of its normal operating range and making it difficult to start the engine. In order to prevent such a situation, it is possible to use the voltage needle installed in the vehicle or the voltage needle installed in the radio, but this is troublesome for the user, and moreover, It's not like the radio is equipped with that kind of voltage needle.

OBJECTS OF THE INVENTION The present invention attempts to notify a decrease in the battery voltage of an automobile by using some sort of indicator installed in an on-vehicle radio.

Structure of the Invention The present invention includes a circuit that compares a power supply voltage of a vehicle with a set value;
an indicator for an on-vehicle radio mounted on the vehicle and operated by the power source; and a circuit for causing the indicator to display a warning on priority basis when the circuit detects a drop in power supply voltage below a set value. This will be described in detail below with reference to the illustrated embodiments.

Embodiment of the Invention FIG. 1 is a block diagram of essential parts showing an embodiment of the present invention, and FIG. 2 is an overall view thereof. The A/D converter in the figure other than 1 is equipped with a standard personal radio, and 2 is an antenna, 3 is a transmitting/receiving section, 4 is a speaker, 5 is a data modulation/demodulation section, and 6 is a logic using a CPU. a control unit; 7 is a switch unit equipped with 10 keys for inputting group numbers, etc.;
Reference numeral 8 denotes a display section for displaying group numbers and the like. As a personal radio, the group number of the other party with which you wish to communicate is entered from the switch section 7, and the group number is displayed using a multi-digit LED, etc., but in this example, this is used to detect the drop in battery voltage. Notify.

The operation will be described below with reference to the flowchart in FIG. This operation flow has been added to the software of the logic control section 6 according to the present invention, and the first step is to input the voltage value of the alarm sending point from the 10 key of the switch section 7 (
Start by inputting the setting values). This setting value is CP
It is stored in the memory in U and compared with the digitized battery voltage through A/D converter 1. If the current voltage value is higher than the set value in the memory, the display section 8
For example, the voltage value at that time is displayed in a part of the display digit of the group code. This is intended to allow the display section 8 to also be used as a voltmeter. However, if it is detected that the current voltage value has fallen below the set value in the above comparison operation, the voltage value at that point displayed in the group code digit of the display section 8 will be flashed to reduce battery consumption. Inform the user of something significant. The setting value inputted from the switch section 7 is arbitrary. Therefore, by inputting a somewhat higher setting value, a preliminary warning can be issued when the personal radio is operating normally and the engine can be started. If the wireless device is to be used further from this state, a slightly lower setting value may be input again from the switch section 7. If an alarm occurs with this set value, the engine is started to charge the battery, or wireless communication is stopped to prevent further consumption of the battery. Although this is just an example, if the set value can be varied, the above-mentioned step-by-step alarm can be issued. In this case, since the personal radio device is equipped with a switch unit 7 having 10 keys as standard, changing the set value is easy.

FIG. 4 is a circuit diagram showing another embodiment of the present invention, in which 10 is a voltage monitoring circuit, 11 is a display control drive circuit, 12 is a display device,
13 is a power line from the battery. The voltage monitoring circuit 10 detects the panteri voltage v by the Zener diode D1.
B is monitored, and if V8 is higher than the Zener voltage, the transistor TI is turned on, and if vB is lower than the Zener voltage, the transistor T1 is turned off. At this time, an alarm is activated, but the display control drive circuit 11
turns off, transistors T3. An astable multi-by-break including T4 is triggered and transistors T5. Ta
is turned on and off at predetermined intervals. Since the transistor T5 is inserted on the power supply side of the display device 12, if a grounding path for the display device is formed, a blinking operation (alarm display) is started. Transistors T2 and T7 are connected to the ground side of the display 12.
are inserted in parallel. Transistor T7 is 0N-A
This is for IR and turns on when the function display signal indicates "transmitting". On the other hand, the transistor T2 is for alarm purposes, and is turned on by being supplied with base current when the transistor Ti is turned off.

Explain the operation. When the battery voltage VB is sufficiently high and the Zener diode D1 is on, the transistor T1 is on, so the transistor T2 is off, and the collector of the transistor T3 is grounded through the diode D2, so the multipipe leak does not operate. It's stopped. For this reason, transistor T5. T6 is permanently in the on state. At this time, if the radio device is receiving, the transistor T7 is off and the display 12 is off, but if it is switched during transmission, the transistor T7 is on and the display 12 is lit. In this way, the display 12 is originally for 0N-AIR, which is standard equipment in radio equipment, but when the battery voltage Va decreases and the transistor T1 turns off, regardless of whether it is transmitting or receiving, the multivibrator starts. to turn on and off the transistor T6, and
Since the transistor T2 is turned on, the display 12 starts blinking to notify the voltage drop. In this case, the display 12 may be a power lamp that lights up when the non-IJI machine is powered on and goes out when it is powered off.

Effects of the Invention As described above, according to the present invention, a drop in the battery voltage of an automobile is notified by using the display device originally included in the vehicle radio, so that when the engine is stopped, there is no need to provide a separate display device. This has the advantage of preventing excessive battery consumption.

[Brief explanation of drawings]

1 and 2 are main parts and overall block diagrams showing one embodiment of the present invention, FIG. 3 is a flowchart showing processing of battery voltage drop alarm, and FIG. 4 is a block diagram of another embodiment of the present invention. FIG. In the figure, 1 is an A/D converter, 6 is a logic control section, 7 is a switch section, 8 is a group number display, 10 is a voltage monitoring circuit, 1
1 is a display control drive circuit, and 12 is a display device. Applicant Fujitsu Ten Ltd. Representative Patent Attorney Minoru Aoyagi Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (11) A circuit that compares the power supply voltage of a vehicle with a set value, an indicator for an on-vehicle heat IJ installed in the vehicle and operated by the power supply, and a circuit that compares the power supply voltage of the vehicle with a set value. A power supply voltage drop alarm device for a vehicle, characterized in that it is equipped with a circuit for preferentially displaying an alarm on the display when a drop below is detected. (2) The set value is set by a radio switch Claim 1 characterized in that the value can be varied from
The vehicle power supply voltage drop alarm device described in 2.