3.1. VE Measurement

3.1.  VE Measurement

Bench test

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Icon for Bench test

ve measurement

Screen Shot: VE Measurement

                                                                                             

Upon the start of the operation, a map of measurements is displayed which clearly shows the number of measurements in each cell of the map. The header of the map shows the current measured values. The task of the operator who controls the motorcycle at the station and load characteristics of the station is to gradually perform a sufficient number of measurements in each cell of the measuring map. The map is provided with an inactive mask (gray cells). These cells are not included in the measurement. The area of the current engine mode is clearly indicated with the cursor. The minimum number of measurements is 7 (a light green cell) and the optimum number is at least 15 measurements (green cell).
The default sampling rate of the measurement is set to 0.150 sec. The measurement control is similar to a recorder. Therefore, you can start, pause or stop the recording, (recording of measurements). It is obvious that the system does not start storing the measurements until the engine has reached the operating temperature, or it leaves the range during the measurement.
If the engine temperature is lower than required, the color of the reading is blue and flashes. The temperature reading turns red if you exceed the maximum permitted temperature for the measurement. Temperature is measured at the engine cylinder.
Operating temperature of the Evolution engine (Sportster): 140-190 °C / 284-374 °F Operating temperature of the Twin Cam engine (Dyna, Softail and Touring mod.) 80-140 °C / 176-284 °F
The RPM reading also changes its color dynamically. By default, it turns red when the engine RPM exceeds the limit of measurement.
RPM limit = (RPM of the limiter) – 100 min -1
The time and efficiency of the measurement is mainly determined by the experience of the operator.When measuring on a power bench Smart Bench (ATAL product – see below) the total coverage of the VE maps takes 30 to 60 minutes, depending on the structure of the maps.
The following maps are displayed as a result of the VE measurement:
  • Original VE maps (front and rear cylinder)
  • New (measured) VE maps (front and rear cylinder)
  • Differential VE maps (front and rear cylinder)
  • AFR maps of the measurements (the control maps measured with a target value of AFR = 13.5)
  • A map showing the number of measurement samples
The system then offers to store the new VE maps to your PC and to the EFI system of the motorcycle. You should accept this unless the measurement contains an evident error. After this operation, you have new VE maps stored in the EFI.
To decide on further procedure, you need to evaluate the differential VE maps. If the difference in VE is less than 5%, you can finish the measurement and regard the result as final. If there are more differences in VE exceeding 5%, it is necessary to repeat the measurements. The new VE maps from the first measurement will now be used as default VE maps. From experience, it is usually necessary to use two measuring steps for optimal setting of new VE maps.
For the measurements it is possible to use any dynamometer.
at531-4098-al-rampa-35R-webTo view the latest leaflet, refer to www.diag4bike.eu ( com), Section Harley-Davidson
Smart Power Bench – a power bench for the diagnostics and tuning of motorcycles
Smart Bench has multiple uses. The basis of its function is to simulate the load corresponding to driving on the road. Regarding diagnostics, it is an ideal and user-friendly tool for monitoring of the engine function and its accessories under load.
Smart Bench uses roller driven fans used as a dynamic load to simulate the aerodynamic drag. Fans are also used as a source of cooling air for the tested engine. In most cases there is no need for additional cooling of the motor during the measurement of VE maps. This bench can also be successfully used to measure VE maps during the Bench Test described here. The test bench does not require any control during the measurement. The measurements are performed in steady and acceleration modes, at constant throttle opening.
Adjusting the throttle is done using a (Throttle Control Limiter)

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Throttle Control Limiter

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Throttle Control Limiter

 

Road test

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Icon for Road Test

Before the start of Road Test, it is necessary to install on the motorcycle and mechanically secure the AFR Tuning monitor with the Diag4Bike™  communication interface. After the start of the measuring operation of Road Test the mode communication interface is set to the Road Test mode. You can then disconnect the USB communication link from the PC and start the road test.
The aim is to use gradually each of the driving modes. Transitions between the modes should be gradual. You should bear in mind sampling which is identical to the Bench Test. Obviously, the result and the measurement range is dependent on the operator – the driver. Optimal space for this test is a safe and sufficient asphalt surface (preferably airport) or a road with little traffic.
An experienced operator is able to cover the maps within about one hour. The total memory capacity for the road test is 32 hours of drive, or a period during which the ignition is on.
The following maps are displayed as a result of the VE measurement:
  • Original VE maps (front and rear cylinder)
  • New (measured) VE maps (front and rear cylinder)
  • Differential VE maps (front and rear cylinder)
  • AFR maps of the measurements (the control maps measured with a target value of AFR = 13.5)
  • A map showing the number of measurement samples
The system then offers to store the new VE maps to your PC and to the EFI system of the motorcycle. You should accept this unless the measurement contains an evident error. After this operation, you have new VE maps stored in the EFI.
To decide on further procedure, you need to evaluate the differential VE maps. If the difference in VE is less than 5%, you can finish the measurement and regard the result as final. If there are more differences in VE exceeding 5%, it is necessary to repeat the measurements. The new VE maps from the first measurement will now be used as default VE maps. From experience, it is usually necessary to use two measuring steps for optimal setting of new VE maps.
 

  VE Analysis test ( AFR monitor test ) 

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Icon VE Analysis test

 

This is an upcoming feature which will allow you to compare any two selected VE measurements. When measuring VE in two steps, it is possible to use this function, for example, to view the final difference between the original condition and the result of the second measurement.

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