Fuel vapor pressure measuring apparatus

A fuel vapor pressure measuring apparatus comprising:

• a fuel pump for pressure feeding fuel;
• a plurality of fuel vapor generating sections each including a nozzle, a venturi, and a vaporizing chamber provided around the nozzle, each fuel vapor generating section being configured to allow the fuel pressure-fed from the fuel pump to be injected from the nozzle and pass through the venturi, thereby vaporizing the fuel in the vaporizing chamber;
• pressure detecting sections for detecting pressures of fuel vapor in the vaporizing chambers of the fuel vapor generating sections;
• temperature detecting sections for detecting temperatures of the fuel vapor in the vaporizing chambers of the fuel vapor generating sections;
• a temperature regulating section for regulating the temperature of the fuel vapor in the vaporizing chamber of at least one of the fuel vapor generating sections;
• and
• a fuel vapor pressure characteristics calculating section adapted to operate the fuel pump and the fuel vapor generating sections and also operate the temperature regulating sections, to detect the temperatures at plural points through the temperature detecting sections and detect the pressures corresponding to the temperatures at the plural points through the pressure detecting sections in the process of operation of the temperature regulating section, and to calculate fuel vapor pressure characteristics based on the detected temperatures and pressures at the plural points.

A fuel vapor pressure measuring apparatus comprising:

• a fuel pump for pressure feeding fuel;
• a fuel vapor generating section including a nozzle, a venturi, and a vaporizing chamber provided around the nozzle, the fuel vapor generating section being configured to allow the fuel pressure-fed from the fuel pump to be injected from the nozzle and pass through the venturi, thereby vaporizing the fuel in the vaporizing chamber;
• a pressure detecting section for detecting pressure of fuel vapor in the vaporizing chamber of the fuel vapor generating section;
• a temperature detecting section for detecting temperature of the fuel vapor in the vaporizing chamber of the fuel vapor generating section;
• a fuel pressure changing section for increasing pressure of the fuel to be pressure-fed to the nozzle of the fuel vapor generating section;
• and
• a fuel vapor pressure characteristics calculating section adapted to operate the fuel pump and the fuel vapor generating section and also operate the fuel pressure changing section, to detect the temperature several times through the temperature detecting section and detect the pressure several times through the pressure detecting section in the process of operation of the fuel pressure changing section, and to calculate fuel vapor pressure characteristics based on the detected temperatures and pressures at the plural points.