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Remote engine start system via mobile phone

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Encyclopedia of radio electronics and electrical engineering / Automobile. Security devices and alarms

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Winter, frost, and you get into a warm car with windows warmed up from ice and immediately set off. And you need quite a bit for this - for someone to start the engine in advance and turn on the car heater. The idea of automatic or remote engine start did not arise yesterday. After all, in theory, everything is quite simple: you just need to reproduce your actions when starting the engine, in other words, turn the ignition key for you. Currently, there are many car alarms with the function of auto-starting the engine, but most of them have a limited range, especially in urban areas. And a scheme was created to control and manage the auto-start functions of a car engine from almost any distance (limited by the GSM reception area).

This circuit was developed to work with the StarLine-03 car autostart module, but it is possible to adapt it to other autostart modules or car alarms with the autorun function. in most car alarms with an autostart function, there is an additional input for controlling it, via GSM or via a paging channel.

The autorun add-on kit includes:

1. Cell phone (having an auto-answer option when hands free is connected) with a SIM card, a hands free connector and a charger (installed in the car). The phone number (SIM card) is kept secret by the owner for security purposes.

2. Interface for DTMF signal decoding, control and monitoring of the autorun module.

It is also possible to supply a miniature backup battery when the car's on-board battery is disconnected.

First of all, when constructing the circuit, it was taken into account its low cost, repeatability and the ability to work with any cell phone (without interfering with the design of the phone).

When working with the system, the owner has direct control over the autostart functions of the car by listening to tone messages from the car. Working with this interface is simple. When dialing a number on the phone installed in the car, 2-3 beeps are heard in the phone speaker, depending on the model of the phone installed in the car, then the latter automatically answers (the phone installed in the car must have an auto answer function when hands free is connected). Auto answer can be controlled by the talk timer on the phone display or by the disappearance of ringtones. Then press button No. 3 on the telephone (the calling telephone must provide dialing in the DTMF standard). After that, short beeps are heard in the speaker. This will happen if the car has been prepared for autostart. If short beeps are heard in the speaker, this means that the car has either started up or is preparing for subsequent engine starts (depending on the autostart options). You can check this by continuing by listening to the beeps for some time, or by calling back later and listening for the presence of beeps. While the engine is running in autostart mode, the knock sensor (relay R2) is automatically turned off.

Forced early stop of the engine is carried out by another call and listening to the answer from the horn speaker. The presence of beeps - the engine is running, the absence - the engine is stopped. In the presence of beeps, they also press button No. 3, and listen to the sound from the speaker. If there are no beeps, it means that the engine is stopped.

The interface also has an anti-theft option (anti-graber): forced engine blocking, light indication "blinking" high beam and sound indication (intermittent horn signal). This command is given by calling the phone installed in the car and pressing button No. 7, at the same time the owner hears the sound of a siren in the phone speaker. Reset this option with button #5.

Also in this device, there is an emergency stop of the engine running under the control of the autorun module, when the factory or installed security systems are triggered (input 6).

Remote engine start system via mobile phone

(click to enlarge)

Assignment of contacts connected to the circuit

1) DTMF input (output from cell phone via hands free wire, headphones).
2) Microphone output (cell phone input via hands free wire, microphone).
3) Start/Stop of the autorun module, start/stop control wire of the autorun module.
4) 12Volt ignition switch.
5) Gasoline pump.
6) To the car alarm output - siren / bell.
7,8) Blocking the engine or fuel pump of the car.
9) On the horn-signal relay (car horn steering button).
10) High beam relay (under the car's steering light switch).
11) Car foot brake button, reset wire for the autorun module.
12,13) Blocking the shock sensor of the car alarm.
14,15) Blocking the shock sensor of the car alarm.

Upon receipt of the tone message "3" (pressing the button "3" on the calling phone), the signal is decoded by the elements IC1 and IC2. Next, c15 legs IC2 and a key transistor through the output (3) of the interface, a command is sent to the autorun module. The car autostart module will start the car. When a voltage of 12 volts is applied to (4) and (5) the output of the interface, through the elements IC4.4 and IC4.1, permission is given to start the generators on IC5.1, IC5.3, the switch IC5.4 and turn on the blocking relay R2 car knock sensor. On (2) the output of the interface appears short signals with a frequency of 800-1000 Hz. When the tone sending is pressed on the "7" button, IC3.1, relay R1 and elements IC5.1, IC5.2 are activated. The engine, outputs (7) and (8) will be blocked, two-tone signals will appear on the output (2) of the interface (simulation of the sound of a siren), relay R3 will periodically operate and the corresponding levels will appear on (9) and (10) interface outputs. (9) the output will periodically close to ground, which will cause the horn to work, and 10 volts will periodically appear on the (12) output to activate the high beam relay of the car headlights. Reset occurs when the tonal message "5".

When the car is started remotely, but the auto alarm has been triggered, the IC3.2 node sends a signal to reset the auto start module. If the auto alarm is with auto start, the IC3.2 node and the R2 relay circuits can be abandoned (Fig. 2).

(click to enlarge)

Details used in the scheme

IC1 - KT3170 (MT8870, KR1008VZH18).
IC2 - K561ID1
IC3 - K561TM2
IC4 - K561LA7
IC5 - K561TL1

Any miniature transformers perform the function of galvanic isolation.

Resistor Rx 50-100 kOhm is selected "by ear" according to the output signal terminal (2) for a distinct two-tone signal at the output, "siren effect" when the DTMF command ''1'' is applied to the input of the device (7).

Capacitor Cx is selected in such a way that when voltage is applied to terminal (6), the accumulation time on it is at least 5 seconds. To exclude false alarms when arming / disarming the alarm.

Engine blocking relay, contacts 7/8, automotive with freely closed contacts, the rest are miniature relays with two pairs of changeover contacts.

The 5V voltage regulator for the circuit can be made according to any scheme. To power the phone, I took a ready-made car charger. Not all cell phones support a constant charge mode to simulate a periodic off-on charging. An additional relay has been installed, which, when the car starter is turned on, interrupts the charging of the cell phone with its contacts.

The printed circuit boards are made in Sprint-Layout. Download

The conductors and blocking diodes of the relay, marked in red, are made by air.

Attention! The interface has nothing to do with a burglar alarm.

Author: Tarasov Victor Samara; Publication: cxem.net

See other articles Section Automobile. Security devices and alarms

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