Gasoline Reid Vapor Pressure detection with brushless fuel pump

A gasoline Reid vapor pressure (RVP) detection system, comprising:

• a fuel pump and a motor operating the fuel pump in a forward direction of rotation to feed a gasoline fuel to a vehicle engine;
• a control device in communication with the motor selectively directing change from the forward direction of rotation to a reverse direction of rotation opposite to the forward direction of rotation;
• a pressure reduction device receiving flow of the fuel during operation in the reverse direction of rotation and reducing a pressure of the fuel until fuel vaporization occurs;
• and
• a pump speed at which vaporization of the fuel occurs at the pressure reduction device or the feed pump when a motor speed and a motor current change non-linearly being correlated to a fuel RVP.

A gasoline Reid vapor pressure (RVP) detection system for a motor vehicle, comprising:

• a fuel pump and a fuel pump motor operating the fuel pump in a forward direction of rotation to feed a gasoline fuel to a vehicle engine;
• a control device in communication with the motor;
• an engine control module in communication with the control device;
• an RVP learn enable logic enabled within the engine control module when a calibrated engine mode is met, signaling the control device to direct change from the forward direction of rotation to a reverse direction of rotation opposite to the forward direction of rotation;
• and
• a pressure reduction device receiving flow of the fuel during operation in the reverse direction of rotation and reducing a pressure of the fuel below an atmospheric pressure until fuel vaporization occurs;
• wherein a fuel RVP is determined when the fuel passing through the pressure reduction device vaporizes indicated by a non-linear change in a motor speed and a motor current.