Vss And Gearbox - ECU Master EMU User Manual

VSS and gearbox

Vehicle's speed sensor is usually placed in the gearbox. It is used by factory systems, e.g.,
speedometer or the system supporting the steering wheel (e.g., electrical support system).
Vehicle's speed can be also read from ABS sensors.
Ecumaster EMU device uses the VSS reading to regulate the boost pressure towards the vehicle's
speed, controlling idle or the recognition of the currently selected gear.
To configure the VSS sensor, you should open the set of parameters VSS and gearbox.
PARAMETER
Gear detection type
Sensor type
Trigger edge
Freq. divider
Enable pullup
Speed ratio
Gear X ratio
Ratio tolerance
Gear sensor input
CAN ID
CAN ID byte idx
DESCRIPTION
Calculated - current gear is determined on the basis of Vehicle Speed
/ Engine RPM ratio. Calculated ratios can be read from(VSS and
gears/ Gear ratio). For detection to work properly, ratios must be
entered in fields Gear x ratio
Gearbox sensor - current gear is determined by measuring voltage
from sensor located in gearbox. Sensor calibration can be found in
Gear sensor calibration table
CAN BUS - gear information is read from Can Bus signal
Type of sensor used to detect vehicle speed. VR or Hall sensor can
be selected
Edge of sensor signal used to calculate vehicle speed
Speed sensor signal frequency divider is used in case of high
frequency signal
Activates 2k ohm pull-up resistor from signal input and +5V
Frequency multiplier used to calculate km/h speed from VSS signal
frequency
Vehicle Speed / Engine RPM ratio for gear X. For calibration, value
can be checked in VSS and gears/ Gear ratio log.
Maximum allowed gear ratio deviation for gear to be determined
Analog input used to connect gearbox gear sensor
Can Bus frame ID containing information about current gear
Number of byte in frame that contains information about current gear
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