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3E-17
TOD SYSTEM OPERATION
The TOD system is responsible for distributing torque between the front and rear axles. The TOD monitors the propeller
shaft speeds, operating range (High/Low), and ABS activity and then applies a calculated amount of torque to the front
axle by Pulse Width Modulating the current applied to the EMC.
Touch-off torque
The minimum EMC Duty Cycle is based on the vehicle speed and throttle position.
The TOD receives the TPS signal from the following sources:
On vehicles equipped with CAN, the TOD receives the TPS signal from the CAN bus.
When slip detection
The TOD continuously monitors the front and rear propeller shaft speeds to detect wheel slip.
Wheel slip control
When wheel slip is detected the TOD controls the EMC duty cycle as necessary until the wheel slip is reduced below
the allowable limit. The EMC Duty Cycle will then be reduced to the Touch-Off value.
Brake/ABS strategy
When the ABS System is active, the EMC Duty Cycle is set to a fixed duty cycle (30 %) to aid in braking without
counteracting the ABS System.
4L strategy
When the system is operating in 4L, the TOD continues TOD (operation provided that the propeller shaft speed is below
10 Hz). When the speed increases above 10 Hz, the EMC Duty Cycle is set to the maximum value (88 %) which applies
the maximum available torque to the front axle.
TOD
CHANGED BY
REXTON SM - 2004.4
EFFECTIVE DATE
AFFECTED VIN
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