Engine Speed Limiter Setup
Engine Speed Limiter Setup
Cut Pattern
Select the cut pattern type
.
0: Random Pattern 1
1: Random Pattern 2
2: Sequential Pattern 1
3: Sequential Pattern 2
Ign Retard Mode
Applies the Ignition Retard as either an Offset or Percentage of Base Angle (Table value)
Example: Current Ignition Angle = 25.0 BTDC
Offset = 15.0 Deg Retard. Ignition Angle During
Limiting = 25.0 - 15.0 = 10.0 Deg BTDC
Percentage = 50.0 % Retard.
Ignition Base Angle = 20.0 Deg.
Ignition Angle During Limiting = 20 - 50% x 20.0 = 10.0 Deg BTDC
(assuming no other Ignition trims)
Control Range
Control Range (-/+) RPM Units
The Control Range applies to the Min/Max % Cut values
Example :
Min % Cut Clamp 10%
Max % Cut Clamp 90%
Control Range -200rpm
RPM Limit 7000rpm
At 6800rpm the engine will begin its cut routine at the Min % Cut Clamp of 10%
At 7000rpm the engine will finish its cut routine at the Max % Cut Clamp of 90%
Minimum %Cut Clamp
Percentage cut applied to the engine at the start of the control range.
Maximum %Cut Clamp
Percentage cut applied to the engine at the end of the control range.
NOTE: Maximum Cut MUST be > Minimum Cut
Hard Limit Adder
Used in Limit types 2 and 3.
Added to the start on the limit and determines the point at which a 100% cut will be applied.
Example:
Limit Type = 2 (Fuel Cut + Ign Hard Cut)
RPM Limit = 7000
Control Range = -200 RPM
Hard Limit Adder = 180 RPM
Fuel %cut Engine Limiting starts at 6800 at the Minimum %Cut
Fuel %cut Engine Limiting ends at 7000 at the Maximum %Cut
Ign 100% cut occurs at 6980 RPM and above.
dRPM Gain
Compensates for a fast rate of change in engine speed by reducing the limit value.
Used to prevent the engine pushing through the limit.
Locked out when dRPM < 2000 RPM/sec.
A Gain of 100 will reduce the limit by 100 RPM for every dRPM 1000 RPM/sec over the 2000 start threshold.
Example 1:
dRPM Gain = 100
RPM limit = 6500
dRPM = 3000 RPM/sec
New RPM Limit = 6500 - 100 = 6400
Example 2:
dRPM Gain = 100
RPM limit = 6500
dRPM = 4000 RPM/sec
New RPM Limit = 6500 - 200 = 6300
0 = OFF
Ignition Retard
The amount of Ignition Retard applied during limiting.
There are 2 modes :
- Offset (Deg)
- Percentage (%)
Post Start Lockout
Will prevent the limit operating during crank and for a time after the engine has started.
Useful when channels like oil pressure are assigned to an RPM limiter function.
** Using the Engine Protection Control function is highly recommended instead