RU215583U1 - User interface unit (UIP) for in-vehicle emergency call equipment - Google Patents

Abstract

The utility model relates to GLONASS/GPS navigation terminals installed on motor vehicles. The technical result consists in simplifying the design of the device by providing the ability to transmit an audio signal from a microphone, signals for pressing buttons, and for providing power and indication over two wires. The user interface unit (UIU) for in-vehicle emergency call equipment (AVEOS) includes a housing, indicator LEDs connected to a comparator, a microphone connected to an operational amplifier loaded with a resistive load, and control buttons. The circuit elements are powered from the voltage regulator, while the output/input of the BIP is made with the possibility of connecting via a two-wire connecting cable to the electronic unit of the AVEOS. The BIP is configured to transmit a signal from the microphone to the input of the audio codec of the AVEOS electronic unit, transmit signals from the control buttons to the ADC input of the AVEOS electronic unit, turn on the indication of the operation of the BIP, and receive power by means of a two-wire cable. 1 w.p. f-ly, 3 ill.

Description

The utility model relates to GLONASS/GPS navigation terminals installed on vehicles, namely to a user interface unit (UIU) for in-vehicle emergency call equipment (AVES), as well as for other audio communication devices.

A user interface unit for an in-vehicle emergency call system is known, which is installed in the passenger compartment and includes a housing with a cover, an operating mode indicator, an emergency call button "SOS", a microphone, characterized in that it contains a speaker built into the housing, a second microphone and a DSP processor, at the same time, the operation mode indicator is integrated into the SOS emergency call button, designed to establish a connection with the network for transferring an emergency call to an emergency call control center with the formation of duplex communication through two microphones and a speaker and signal processing by a DSP processor.

The disadvantages of the prototype is the complexity of the device, namely the presence of a processor and an additional microphone, in addition, the device contains a connector 43045-1418 f. Molex, which is connected by a mating block and requires a large number of wires.

The objective of the proposed utility model is a reliable, simple and easy-to-use device.

EFFECT: technical result consists in simplifying the design of the device due to the possibility of connecting the BIP with the AVEOS via two wires, which allows transmitting an audio signal from a microphone, signals of pressing buttons, and providing power and indication via two wires.

This result is achieved due to the fact that the user interface unit (UIU) for in-vehicle emergency call equipment (AVES) includes a housing, indicator LEDs connected to the comparator, a microphone connected to an operational amplifier, which is loaded on a resistive load, control buttons, when In this case, the power supply of the circuit elements is carried out from the voltage regulator, while the output / input of the BIP is configured to be connected via a two-wire connecting cable to the AVEOS electronic unit, the BIP via a two-wire cable is configured to transmit a signal from a microphone to the input of the audio codec of the AVEOS electronic unit, transmit signals from control buttons to the ADC input of the AVEOS electronic unit, switching on the indication of the operation of the BIP, as well as receiving power. Also in the user interface block, the "SOS" button and the "Additional functions" button are used as control buttons.

Brief description of drawings:

fig. 1 - BIP diagram (on the left is a schematic diagram of the BIP device, on the right is a schematic diagram of the AVEOS electronic unit);

fig. Fig. 2. - scheme for supplying voltage from the BIP to the ADC of the AVEOS electronic unit when the SOS and INT buttons (additional functions) are pressed (BIP is presented as an equivalent resistance Re, with the exception of the SOS and INT buttons and the output resistor R8);

fig. 3. - the BIP indication circuit is implemented on a comparator.

The user interface unit (UIU) for in-vehicle emergency call equipment includes the following main elements:

1. Microphone BM1 (CMM-2718AB-38108-TR)

2. Operational amplifier D3 (TLV9001)

3. Comparator D2

4. Buttons "SOS" (SW1) and "Additional functions" INT (SW2)

5. Backlight LEDs VD1 and VD5

6. Indicator LEDs VD2

7. Voltage regulator D1

8. BIP output (resistor R8)

9. Resistive load - resistor R9

The remaining elements of the device for their connection with other elements of the BIP are visible from the schematic diagram of the BIP shown in Fig.1.

The claimed utility model differs from similar solutions in that all the required functionality is carried out by only two wires, which provides significant savings in the weight and cost of wires and connectors when laying connecting cables.

BIP example.

The BIP includes (Fig. 1) a BM1 microphone (CMM-2718AB-38108-TR) connected to an operational amplifier D3, a comparator D2, SOS (SW1) and INT (SW2) buttons, backlight LEDs VD1 and VD5, indicator LEDs VD2 . The circuit elements are powered by a voltage regulator D1, which generates a voltage of 3.3 V. The BIP output (resistor R8) is connected via a two-wire connecting cable to the UVEOS electronic unit. This cable is used to power the BIP, transmit the signal from the microphone to the audio codec input, transmit signals from the "SOS" and "Additional functions" buttons to the ADC input, turn on the product operation indication. The power supply of the UPS is ULDO stabilizer АР2202 (circuit D23) (circuit EB AVEOS) with low noise level and ultra-low voltage drop. The BIP microphone is connected to the inverting input of a low-voltage operational amplifier D3 (TLV9001) with a unipolar power supply with a gain of 16. The amplifier is loaded with a resistive load - resistor R9. When the amplifier is operating on a resistive load R9, its current consumption depends on the level of the signal supplied to its input, i.e. from the sound pressure on the microphone. When the current consumption of the amplifier changes, according to a similar law, the current at the input of the regulator D1, which forms the supply voltage of the amplifier 3.3 V, will change. (8V8_mis). A change in the current consumption of the BIP will cause a change in the voltage at the input filter of the audio codec D20 - inductance L8 and, accordingly, at the input of the audio codec.

The operation of the SOS and INT buttons (additional functions).

When the SW1 and SW2 buttons are open, the voltage divider on resistors R115 and R137, connected at the input of the ADC (D24), receives voltage Vs=6.1 V, equal to the voltage drop across the BIP elements. Figure 2 BIP is presented in the form of equivalent resistance Re.

When you press the SW1 (SOS) button, voltage is supplied to the input of the ADC divider

Vs=4.9 V. Vs=(8.8V/(R80+R11+R8+(R7⋅Re)/(R7+Re)))⋅(((R7⋅Re)/(R7+Re))+R8).

When the SW2 (INT) button is pressed, voltage is supplied to the input of the ADC divider

Vs=4.2 V. Vs=(8.8V/(R80+R11+R8+(R14⋅Re)/(R14+Re)))⋅((R14⋅Re)/(R14+Re))+R8).

The ADC (D24) measures the incoming voltages at the output of the divider proportional to the input voltage and transmits the voltage information via the I2C bus to the U2 module to perform the appropriate operations.

The operation of the BIP indication LEDs.

The indication circuit (Fig. 3) is implemented on a D2 NCX2200GM,115 comparator with low current consumption. A constant voltage is applied to the inverting input of the comparator (pin 4): Vi=0.57 V from the divider at the resistances R33, R4 (Vi=(3.3/(R33+R4))⋅R4=0.57 V). The voltage Vn=(Vin/(R6+R5))⋅R is applied to the non-inverting input, where Vin is the voltage at the input of the regulator D1. The value of voltage Vn depends on the state of the key VT26. The resistances of resistors R5, R6, R8, R11 and R80 are calculated in such a way that when the key VT26 is open, the voltage at the non-inverting input of the comparator is less than the voltage at the inverting input, and when it is closed, it is greater. As a result, the voltage at the output of the comparator is 3.3 V or 0 V, will depend on the state of the VT26 key. In the first case, one LED is lit, and in the second, the other. The key is controlled by signals from the U2 module.

The BIP is made as a separate module and can be installed in a car either in close proximity to the AVEOS electronic unit or remotely. The figure shows one of the possible options for the implementation of the BIP, it should also be noted that it is not limited to such a design and its circuit diagram can be changed without changing its main functions.

Thus, the use of the BIP as part of the in-vehicle emergency call equipment (AVEOS) installed on vehicles will allow transmitting an audio signal from a microphone, signals of pressing buttons and providing power and indication over two wires, which will simplify the connection of the BIP to the AVEOS, because . the wiring harness will decrease, while the BIP device itself has a simpler circuit diagram that does not include processors and other additional elements.

Claims (2)

1. User interface unit (UIU) for in-vehicle emergency call equipment (AVEOS), including a housing, indicator LEDs connected to a comparator, a microphone connected to an operational amplifier that is loaded with a resistive load, control buttons, while the circuit elements are powered from a voltage regulator connected to the output/input of the BIP, while the output/input of the BIP is configured to be connected via a two-wire connecting cable to the electronic unit AVES, the BIP is configured to transmit a signal from the microphone through the output/input of the BIP, depending on the current consumption of the BIP , transmission of signals from control buttons by generating signals at the output of the BIP, characterized by different voltage levels, switching on the indication of the operation of the BIP depending on the change in voltage at the input of the voltage regulator. 2. The user interface block according to claim 1, characterized in that the "SOS" button and the "Additional functions" button are used as control buttons.

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