This post provides an overview of accelerator pedal sensing as an example of sensing.
In sensing the accelerator pedal, the following points should be considered
- The time it takes for the accelerator pedal to go from fully closed to fully open is said to be about 100 ms for a racing driver.
- Even if the driver thinks he or she is depressing the accelerator pedal consistently, in reality there will be a slight fluctuation.
- Acceleration and deceleration of the vehicle and vibrations from the road surface can cause the driver to unintentionally agitate the accelerator pedal.
- Accelerator pedal pedals and pedal sensors are subject to variations.
- The accelerator pedal has a slightly different initial mounting position.
- The accelerator pedal will shift in installation position during use.
- Noise to pedal sensor signal
- Pedal sensors deteriorate over time.
- Functional safety support.
Considering the above, determine the following specifications for accelerator pedal sensing.
- Number of samplings during 100ms n = sampling period T
- Pedal sensor value to opening degree conversion formula.
- Filtering expression.
- Calibration value of pedal sensor.
- Calibration value for the installed (closed) position of the gas pedal pedal
- Pedal sensor fully closed learning.
- Learning the accelerator pedal mounting position.
- Accelerator pedal diagnostics and failsafes.
