https://wiki.teltonika-gps.com/view/Template:FTX_Features

SECO Scenario

Introduction

Secure Engine Cut Off (SECO) is a functionality that safely disables a vehicle’s engine based on predefined speed or movement conditions. It is typically activated remotely and used for security, immobilization, or theft prevention purposes.

SECO enhances vehicle security by allowing the engine to be disabled under controlled conditions. It helps prevent theft by stopping unauthorized movement, supports fleet security through remote immobilization when suspicious activity occurs, and limits unauthorized usage by shutting down the engine when vehicles operate outside permitted times or areas.

To safely slow down a vehicle after receiving the secoon command, the device waits for the vehicle speed to drop below the configured Speed pulse scenario (km/h) threshold. Once the speed remains below this threshold for the configured Speed check period, the device starts pulsing the configured DOUT to toggle the relay connected to the fuel pump. This intermittently interrupts the fuel supply and gradually slows down the vehicle.

When the vehicle speed further decreases and reaches the configured Speed (km/h) threshold, the system activates the configured DOUT permanently, fully interrupting the fuel supply and bringing the vehicle to a complete stop.

DOUT control remains active until the secoff command is received.

Prerequisites and Important Settings

The device must have at least one free DOUT that can be assigned to SECO functionality.
For SECO functionality to work, DOUT must be selected. SECO has DOUT control priority higher than immobilizer scenario.
IMOPORTANT: If the pulse parameter is disabled while pulsing is active, the DOUT will activate instantly.
IMPORTANT: The SECO scenario must be controlled using SMS and GPRS commands, enabling remote activation and deactivation of the engine cut off functionality.

Basic Operation

The SECO scenario supports the following engine cut off modes, each using different logic for controlling a digital output (DOUT) based on speed, movement, and data availability.

Speed Pulse

The Speed pulse scenario (km/h) parameter defines the speed threshold at which pulsed DOUT control begins. DOUT pulsing starts when:

Vehicle speed drops below Speed pulse scenario (km/h)
Speed remains below this threshold for the configured Speed check period

Once these conditions are met, the device begins toggling the configured DOUT according to the DOUT ON duration and DOUT OFF duration settings.

If the vehicle speed increases above the configured Speed pulse scenario threshold, the Speed check period timer is reset.

Safe Stop Threshold

The Speed (km/h) parameter defines the speed at which the system switches from pulsed control to permanent DOUT activation.

When the vehicle speed reaches or falls below this value, the configured DOUT is activated continuously, completely disabling the fuel pump and stopping the vehicle.

GNSS Available

When a GNSS fix is available, vehicle speed is determined using GNSS data and the SECO process follows the normal flow:

Wait until speed drops below Speed pulse scenario (km/h)
Start pulsing DOUT after the Speed check period
Activate DOUT permanently when speed reaches Speed (km/h)

GNSS Unavailable

If a 'GNSS fix is not available, vehicle speed cannot be reliably determined. In this case, the system uses a safety fallback mechanism.

After receiving the secoon command, the device waits until:

No movement is detected
The configured Movement timeout is reached

Once these conditions are met, the configured DOUT is activated.

This ensures that the fuel supply is not interrupted while the vehicle might still be moving at high speed.

Parameters list

PARAMETER NAME	PARAMETER ID (RELATED AVL ID)	DESCRIPTION	VALUES
SECO DOUT status	396	SECO DOUT status.	0 = SECO DOUT is OFF 1 = SECO DOUT is pulsing 2 = SECO DOUT is ON
Priority	1039600	Priority of how events are being sent to a server. For example, events with low priority are added to the periodical record, and events with high priority are sent immediately after they occur.	0 = SECO scenario is disabled 1 = SECO scenario is low 2 = SECO scenario is high
Speed	12254	Speed threshold at which the configured digital output (DOUT) will be activated.	Minimum value = 0 Maximum value = 255 Default value = 10
Speed pulse scenario	12259	Speed threshold at which the configured digital output (DOUT) will be toggled.	Minimum value = 0 Maximum value = 255 Default value = 10
Speed check period	12255	Time span during which speed must be lower than configured for output to activate (GNSS on).	Minimum value = 0 Maximum value = 65535 Default value = 10
Movement timeout	12256	Duration after which the DOUT will be activated if no movement is detected and GNSS is off.	Minimum value = 0 Maximum value = 65535 Default value = 30
Eventual records	1039604	Enables feature status sending only when the event happens (an eventual record). When disabled, feature status will be sent with both eventual and periodical records.	0 = SECO status will be sent with both eventual and periodical records. 1 = SECO status will be sent only when the event happens (an eventual record).
Output control	12252	Digital output used for connection to fuel pump to gradually stop the vehicle.	0 = DOUT control is disabled 1 = DOUT1 is controlled 2 = DOUT2 is controlled 3 = DOUT3 is controlled 4 = DOUT4 is controlled
Output pulse	12253	Pulse functionality adds additional output control which helps to slow down vehicle before fully disabling fuel pump.	0 = Disabled 1 = Enabled
DOUT on duration	12257	Duration for how long DOUT should be active.	Minimum value = 10 Maximum value = 5000 Default value = 1000
DOUT off duration	12258	A value in milliseconds, for how long DOUT should be inactive.	Minimum value = 10 Maximum value = 5000 Default value = 1000