HM Command — Harsh Maneuver Detector

Intelligent driving event detection with 8 independent instances and 8 specialized algorithms.

What is it for?

Use case	Description
🏎️ Driving scoring	Evaluate driver’s driving style
🚨 Safety alerts	Notify harsh braking or dangerous maneuvers
💥 Impact detection	Identify collisions or accidents
📈 Fleet analysis	Generate behavioral statistics

Description

The HM module detects driving events using 8 independent instances (HM00-HM07) where each can be configured for any algorithm type (0-7):

HMxx = Module index (independent instance)
eventType = Detection algorithm type (0-7)
Total flexibility: HM03 can use algorithm type 5, HM00 can use type 2, etc.

Configuration

Syntax


SHMxxE,eventType,magnitude,min_speed_kmh,hysteresis_percent,time_window_ms,cooldown_s

Parameters

Parameter	Description
xx	Module instance (00-07)
eventType	Algorithm to use (0-7)
magnitude	Threshold (km/h for GPS, mg for accelerometer)
min_speed_kmh	Minimum GPS speed (0 = no restriction)
hysteresis_percent	Anti-oscillation hysteresis percentage
time_window_ms	Minimum sustained duration (0 = instantaneous)
cooldown_s	Time between events (anti-spam)

Algorithm Types

🌐 Hybrid GPS + Accelerometer (Types 0-4)

Require minimum speed and sustained duration.

Type	Icon	Name	Detects	Typical parameters
0	🏎️	GPS Acceleration	Speed increase ≥ magnitude km/h	5-15 km/h, min_vel 5 km/h, 2-5s
1	🛑	GPS Braking	Speed decrease ≤ -magnitude km/h	8-15 km/h, min_vel 10 km/h, 2-4s
2	↪️	Left Turn	Lateral force + rightward	250-400 mg, min_vel 15 km/h, 1-3s
3	↩️	Right Turn	Lateral force - leftward	250-400 mg, min_vel 15 km/h, 1-3s
4	🌀	Centripetal	Total force: √(x²+y²)	300-500 mg, min_vel 20 km/h, 2-4s

⚡ Pure Accelerometer (Types 5-7)

No speed restriction, instantaneous or timed detection.

Type	Icon	Name	Detects	Typical parameters
5	↔️	Lateral Impact	\|acc_y\| ≥ magnitude	1500-3000 mg, min_vel 0, 0-100ms
6	⬆️	Frontal Impact	acc_x ≤ -magnitude	1500-3000 mg, min_vel 0, 0-100ms
7	⬇️	Rear Impact	acc_x ≥ +magnitude	1500-3000 mg, min_vel 0, 0-100ms

Examples by Application

🚛 Commercial Fleet


>SHM00E,0,5,3,20,4000,10<   // HM00 module using algorithm type 0 (Acceleration)
>SHM01E,1,8,8,15,3000,8<    // HM01 module using algorithm type 1 (Braking)
>SHM02E,5,1500,0,10,0,45<   // HM02 module using algorithm type 5 (Lateral impact)
>SHM03E,6,1500,0,10,0,45<   // HM03 module using algorithm type 6 (Frontal impact)

⛽ Hazardous Vehicles (Petroleum)


>SHM00E,0,4,3,25,5000,15<    // HM00 module = Very smooth acceleration (4 km/h increase)
>SHM01E,1,6,5,20,4000,12<    // HM01 module = Gradual braking (6 km/h decrease)
>SHM02E,2,200,10,15,3000,8<  // HM02 module = Very smooth left turn (200 mg)
>SHM03E,3,200,10,15,3000,8<  // HM03 module = Very smooth right turn (200 mg)
>SHM04E,4,220,15,12,4000,10< // HM04 module = Conservative centripetal (220 mg)
>SHM05E,5,1200,0,10,100,45<  // HM05 module = Lateral impact (collision detection)
>SHM06E,6,1200,0,10,100,45<  // HM06 module = Frontal impact (critical protection)
>SHM07E,7,1200,0,10,100,45<  // HM07 module = Rear impact (maximum safety)

🚗 Standard Family


>SHM00E,0,7,5,15,3000,5<    // HM00 module = Acceleration algorithm
>SHM01E,1,10,10,10,2000,5<  // HM01 module = Braking algorithm
>SHM02E,2,330,15,10,2000,3< // HM02 module = Left turn algorithm
>SHM03E,3,330,15,10,2000,3< // HM03 module = Right turn algorithm
>SHM04E,5,2000,0,5,0,30<    // HM04 module = Lateral impact algorithm
>SHM05E,6,2000,0,5,0,30<    // HM05 module = Frontal impact algorithm
>SHM06E,7,2000,0,5,0,30<    // HM06 module = Rear impact algorithm
>SHM07E,4,330,20,10,2000,5< // HM07 module = Centripetal algorithm

Validations

Limits by Type

Type	Unit	Maximum
GPS (0-1)	km/h	50
Accelerometer (2-7)	mg	8000
time_window_ms	ms	GPS minimum 100ms, impacts can be 0ms
cooldown_s	s	120

Anti-Oscillation Hysteresis

Phase	Behavior
Activation	magnitude + hysteresis (higher threshold)
Deactivation	base magnitude (lower threshold)
Prevents	Repetitive activations/deactivations

Recommendations

For Maximum Safety

Use types 0,1 with low magnitude (4-8 km/h)
Long time_window_ms (3000-5000ms)
Extended cooldown_s (10-15s)

For Accident Detection

Use types 5,6,7 with medium magnitude (1500-2500 mg)
Short time_window_ms (0-100ms)
Long cooldown_s (30-45s)

For Driver Evaluation

Combine all types in different modules
Moderate magnitude according to vehicle profile
Moderate cooldown_s (3-8s)

Associated Signals

Signal	Index	Suitable for conditional use
HM	00-07	NO

Available triggers are HM00+ to HM07+. Positive edge only.

Compatibility

💾Firmware:v1.9.15

SP-IOT

SM-IOT

ZE-IOT