Decel Mode - VBOX Touch (v1)

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The Deceleration Mode allows you to perform deceleration tests by using pre-defined configurations, your own specified values, or a VBOX Brake Pedal Trigger. Access the Decel mode by pressing the Mode button at the bottom of the screen and selecting Decel.

The last selected Deceleration test will be displayed after each power cycle. Speed parameters are used to start and end the test. Test results displayed on the screen of the VBOX Touch will remain on screen at the end of the test until the next start condition is met.

The applied speed units depend on the selections in the General Settings area.

Decel Mode Overview

The Deceleration screen displays current/completed test information.

The screen is split into two halves:

Left-hand side:

This includes a live speed display which always shows the current speed of the vehicle, irrespective of any start or end conditions set for testing. If the vehicle is travelling slower than 0.5 km/h or VBOX Touch loses the satellite lock (less than 4 satellites found), the value will be displayed as 000.0.

Right-hand side:

The test information displayed here depends on the test type you have selected:

Speed decel test: When you have selected this test type you will see the following data:

Distance travelled
Run number
Time taken
Average deceleration achieved
Maximum deceleration achieved (g)
Height difference

These values will start to populate when the start condition of the test is met. When the end condition is met, they will remain on screen until the start condition is met again. You can reset a test by pressing the Reset button at the bottom of the screen.

Trigger decel test: When you have selected this test type you will see the following data:

Distance travelled
Run number
Trigger time
Trigger speed
Corrected distance
MFDD
Average deceleration

These values will start to populate when the minimum trigger speed is met and the trigger is activated. When the vehicle is stationary (below 2.5 km/h), the data will remain on screen until the minimum trigger speed is met and the trigger is activated again. You can reset a test by pressing the Reset button at the bottom of the screen.

When the trigger is activated, you will see 'ON' displayed next to the Trigger test header.

Selecting a Test

You can access the Decel Mode settings screen by selecting the Settings button at the bottom left of the screen in Decel Mode. This is where you choose the test parameters and see other test options.

VBOX TOUCH FW v1.5 - Decel Settings (Decel)_600px.png

Return to the main screen by pressing the Exit button at the bottom left.

You choose your test type by pressing the Test Type button. You can either start tests from a specific speed or by using a VBOX Brake Pedal Trigger. You will see different setting options depending on the test type you select.

IMPORTANT
You must use the external antenna when conducting a brake trigger test.

Test Type: Decel

If you select Decel as the Test Type, you will see preset and custom test options available on the right-hand side of the screen.

The currently selected test is highlighted on the screen and will be remembered for future use, even if you select another mode.

Preset Tests

VBOX Touch is supplied with 5 preset Decel tests.

60 - 0 (km/h or mph)
100 – 0 (km/h or mph)
200 – 0 (km/h or mph)
300 – 0 (km/h or mph)
400 – 0 (km/h or mph)

When you select a test, the name will be displayed in the top right corner of the Decel Mode screen.

Custom Test

You can choose your own start and end conditions for the test by selecting the Custom Test in the test selection area. You can then define the start and end speed conditions by pressing the corresponding buttons and using the presented keypad.

Input Start Speed (150) - No Frame+600px.png
Start Speed Keypad Example

Press the Confirm button to save your selected value or press the Cancel button to return to the Settings screen without saving.

Notes:

The maximum input value for speed is 999.9 (1 decimal place only).
The minimum start speed is 5 km/h or 3.1 mph.

Save the Custom Test by pressing the Confirm button at the bottom right of the screen, or press the Cancel Button at the bottom left of the screen to go back to the Decel Mode screen without saving.

The name of the selected test will be displayed in the top right corner of the Decel Mode screen. The last defined Custom Test will be remembered for future use, even when you use a Preset Test or another mode.

Test Type: Trigger

A Trigger test will start once a Minimum Trigger Speed is met and a VBOX Brake Pedal Trigger is activated. The test will stop once the vehicle is stationary (below 2.5 km/h).

IMPORTANT
You must use the external antenna when conducting brake trigger tests.

When you select Trigger as your test type, the Trigger Settings become available on the right-hand side of the screen.

VBOX TOUCH FW v1.5 - Decel Settings (Trigger)_600px.png

With Trigger selected as the test type, 'TRIGGER' will be used as the test header and will be displayed at the top right corner of the Decel Mode screen. When the trigger is activated, 'ON' will be displayed next to the header.

Minimum Trigger Speed

VBOX Touch Decel Settings Min Trigger.png

This setting defines the Minimum Trigger Speed, at which trigger activation becomes valid. If the trigger is detected below this speed, the test will not start. You can change this setting by pressing the current value and using the presented keypad.

VBOX Touch FW 1.5 - Input Minimum Trigger Speed_100 (498x298).png

Minimum Trigger Speed Keypad Example

Press the Confirm button to save your selected value or press the Cancel button to return to the Settings screen without saving.

Note: The maximum input value for speed is 999.9 (1 decimal place only).

MFDD Settings

These settings let you set up the start and end period of the Mean Fully Developed Deceleration (MFDD) analysis period.

This deceleration figure is used to show the maximum deceleration a vehicle can achieve. It is usually the deceleration between 80% and 10% of the trigger activation speed, the time at which the vehicle is loaded up and braking at its highest achievable level.

The MFDD is calculated by the following formula (using default 80% – 10% value):

MFDD = ((v_08)² – (v_01)²) / (25.92 * (s_01 – s_08))

Where:

v_08 is the speed at 80% of the brake trigger activation speed.
v_01 is the speed at 10% of the brake trigger activation speed.
s_01 is the distance at which the speed is v_01.
s_08 is the distance at which the speed is v_08.

MFDD can be also calculated using Speed. Press the MFDD button until it reads Speed.

You can change the speed values by pressing the current value and using the presented keypad.

VBOX Touch FW 1.5 - Input MFDD From Speed_80 (498x298).png

MFDD From Speed Keypad Example

Save the selected value by pressing the Confirm button at the bottom right of the screen, or press the Cancel button on the bottom left of the screen to return to the Settings screen without saving.

Minimum/ Maximum Values

From

Speed
- The maximum From speed selectable is the value inputted as Minimum Trigger Speed.
- The minimum From speed selectable is the greater value of 5 km/h or the To value +1.

Note: The maximum input value for speed is 999.9 (1 decimal place only).

Percentage
- The maximum From percentage selectable is 100%.
- The minimum From percentage selectable is the To value +1.

To

Speed
- The maximum To speed selectable is the From value -1.
- The minimum To speed selectable is 0.
Percentage
- The maximum To percentage selectable is the From value -1.
- The minimum To percentage selectable is 0.

Test History

You can view a history of the test results by selecting the Results button at the bottom of the screen. The test results will be displayed until you choose a new test type or press the Reset button.

VBOX Touch Decel Results.png
Sample speed decel test results screen

VBOX Touch Decel Results.png
Sample trigger decel test results screen

Tests will be displayed in chronological order and the fastest will be highlighted. To scroll through the results, use the scroll bar on the right-hand side of the screen.

Each new session will have a separate header, displaying the time and date for the first completed test in that session.

Information includes:

Header
- Test type
- Time of first completed run in session
- Date of first completed run in session

Speed Decel Test:
- Test run number
- Test completion time
- Test completion distance (km/h or mph)
- Maximum speed achieved during a test run (km/h or mph)
- Maximum deceleration achieved during a test run (g)
- Altitude difference between the start of the test and the end of the test (m or ft)

Trigger Decel Test:
- Test run number
- Test completion distance (km/h or mph)
- Speed at trigger event (km/h or mph)
- Corrected trigger test distance (m or ft)
- Mean fully developed deceleration (MFDD) (g or m/s²)
- Average deceleration achieved during test run (g or m/s²)

You can take a screenshot of the test history by pressing the Screenshot Button.

Return to the main screen by selecting the Exit Button at the bottom left of the screen.

IMPORTANT
A maximum of 127 tests will be displayed in chronological order. However, if you complete more tests, they will still be recorded on the SD card. Once the limit has been reached, you will see a warning message advising that further tests will not be saved to the Test History. The message will show again if the unit is power-cycled. A 'TEST HISTORY FULL' notification will also be shown beneath the Live Speed display. To view new test history results, press the Reset button.

Save Results

You can also save the results as a .txt or .csv file (depending on the selected option) to the SD card by pressing the Save button at the bottom of the screen. The unit will emit an audible notification to confirm that the data has been saved. If the results have could not be saved successfully, for example, no SD card is inserted or the card is full, the button will flash 3 times and VBOX Touch will emit an audible error notification.

If saved successfully, the file name will include the test type, the date and the time taken from the first completed run in that session. Along with the test history information described above, the results file also includes average acceleration information, as well as the latitude and longitude position (in degrees and decimal degrees format) added to the session header.