Vehicle Speed Sensors

Vehicle Speed Sensors

Vehicle Speed Sensors (VSS) can be used with your Elite ECU for multiple purposes. Besides datalogging, vehicle speed sensors are used for Fuel and Ignition Tuning, Traction Control, Idle Control, Boost Control, Gear Detection, and many other purposes. Up to 4 Wheel Speed Sensors and a Drive Train Sensor can be used with the Elite ECU, and these can be either wired to the Elite ECU or received via CAN with supported vehicles.

NOTE: Traction control for Front Wheel Drive requires at least one front wheel sensor (or drive train sensor) and at least one rear wheel speed sensor. Traction control for Rear Wheel Drive requires at least one rear wheel sensor (or drive train sensor) and at least one front wheel speed sensor. Traction control for Four Wheel Drive requires at least two speed sensors. Any combination of the following is acceptable: at least one rear wheel and the drive train, at least one front wheel and the drive train, or at least one front wheel and one rear wheel.

Page Contents

Wiring Tab

Options

Main Source

Select the sensor that is to be used by the ECU for general use Vehicle Speed. This will be used by various ECU functions that require a vehicle speed.

Drive Train Sensor

Enabled when a VSS is located on the gearbox. Select if the sensor is wired to the Elite ECU or it is input via CAN.

Front Left Wheel

Enabled when a VSS is located on the front left wheel. Select if the sensor is wired to the Elite ECU or it is input via CAN.

Front Right Wheel

Enabled when the VSS is located on the front right wheel. Select if the sensor is wired to the Elite ECU or it is input via CAN.

Rear Left Wheel

Enabled when the VSS is located on the rear left wheel. Select if the sensor is wired to the Elite ECU or it is input via CAN.

Right Rear Wheel

Enabled when the VSS is located on the rear right wheel. Select if the sensor is wired to the Elite ECU or it is input via CAN.

Connections

Select between a Digital Frequency or CAN Input. When Digital Frequency is used as the type of sensor, select an appropriate input to use for each of the enabled Vehicle Speed Sensors. An SPI (Synchronised Pulsed Input) should be used.

Edge Select

Select the edge of the signal to be used. Typically this will be Falling unless instructed otherwise.

Sensor Type

Select if the sensor being used is a digital Hall Effect or a reluctor sensor.

Pull Up

Some Hall Effect sensors require a Pull Up if it is not incorporated in the wiring or the sensor itself. Enable as required.


Calibration Tab

This allows calibration of all vehicle speed sensors.

For wired inputs:

Sensor Speeds

Calibration Speed

The speed that the vehicle must be moving precisely at when each sensor is to be calibrated.

Drive Train Sensor and Wheel Speed Sensors

With the vehicle travelling at exactly the same speed as has been entered for the Calibration Speed, press Calibrate for each of the enabled sensors. The Elite ECU will measure the Pulses/km or Pulses/Mile for each sensor accordingly. This value can be manually entered if it is known.

Drive Shaft RPM Sensor

Available only when a Drive Train Sensor is enabled in the Wiring Tab.

Number of Teeth

The number of teeth per driveshaft revolution. This will be consistent with the number of magnets in the driveshaft RPM collar. Typically this will be 2, 8 or 12.

Max Derivative

The maximum rate of change for the driveshaft RPM. This filters out any spikes in signal due to noise.

Warning Maximum

When the Driveshaft RPM reads above this amount, any relevant items on the ESP software will flash Red as a warning of high RPM.

For CAN inputs:

Calibration Speed

The speed that the vehicle must be moving precisely at when each sensor is to be calibrated.

Drive Train Sensor and Wheel Speed Sensors

With the vehicle travelling at exactly the same speed as has been entered for the Calibration Speed, press Calibrate for each of the enabled sensors. The Elite ECU will measure the percentage change for each sensor accordingly. This can compensate for changes in wheel rolling diameter.


Diagnostics Tab

Diagnostic Trouble Codes will be activated under the following conditions:

If 1 or 2 sensors

* Vehicle speed is 0

* TPS is below User Demand Minimum setting and

* MAP is less than -60 kPa and

* RPM is between 2000 and 5000 RPM and

* The above conditions have been true for more than 10 seconds

If more than 2 sensors

* The RPM is less than 4000 and

* TPS is less than 20%

* And the speed is more than 15km/h different from the average of all the vehicle speed sensors

Drive Train Speed Diagnostic

When enabled and activated sets the DTC P0500.

Front Left Wheel Speed Diagnostic

When enabled and activated sets the DTC C1024.

Front Right Wheel Speed Diagnostic

When enabled and activated sets the DTC C1022.

Rear Left Wheel Speed Diagnostic

When enabled and activated sets the DTC C1028.

Rear Right Wheel Speed Diagnostic

When enabled and activated sets the DTC C1026.

Average Wheel Speed Diagnostic

When enabled and activated sets the DTC C1029.

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