Why Mathf.Lerp dosen t work correct?

I want to make steering sistem based on Input.acceleration.x movement and I need to have sensitivity of movement but when i use Mathf.Lerp"(float a , float b , time)" time section when I decrease it to go slowly on point limit the movement under my limit variable

 public void SensorSteer()
     {
         m_steeringAngle = Input.acceleration.x*maxSteerAngle* SteerSensityvity;
         m_steeringAngle = Mathf.Lerp(Input.acceleration.x, m_steeringAngle, SteerSensityvity);
 
         m_steeringAngle = Mathf.Clamp(m_steeringAngle, -maxSteerAngle, maxSteerAngle);
         frontDriverW.steerAngle = m_steeringAngle;
         frontPassengerW.steerAngle = m_steeringAngle;
 
     }