초록 ▼

A vehicle fuel gas supply system includes a fuel line supplying a fuel gas to a gas engine, a shut-off valve and a pressure sensor disposed on said fuel line, and a control section. The pressure sensor is disposed closer to said gas engine in comparison with said shut-off valve. The control section

A vehicle fuel gas supply system includes a fuel line supplying a fuel gas to a gas engine, a shut-off valve and a pressure sensor disposed on said fuel line, and a control section. The pressure sensor is disposed closer to said gas engine in comparison with said shut-off valve. The control section closes the shut-off valve being opened, starts to count the time of a shut-off valve closing timer. Then, the control section opens the shut-off vale when the shut-off valve closing timer counts up, simultaneously therewith measures a pressure by the pressure sensor to store the pressure as an initial pressure, and starting to count the time of a diagnostic timer. Further, the control section measures a second pressure by the pressure sensor when the diagnostic timer counts up to store the second pressure as a final pressure value, and judges that the shut-off value is in a failure state when a pressure increase rate obtained from the initial pressure value and the final pressure value is smaller than a predetermined pressure increase rate threshold value.

대표청구항 ▼

1. A vehicle fuel gas supply system, comprising:a piping that supplies a fuel gas to a gas engine; a shut-off valve and a pressure sensor disposed on said piping, said pressure sensor disposed closer to said gas engine relative to said shut-off valve; and a control section being connected to said sh

1. A vehicle fuel gas supply system, comprising:a piping that supplies a fuel gas to a gas engine; a shut-off valve and a pressure sensor disposed on said piping, said pressure sensor disposed closer to said gas engine relative to said shut-off valve; and a control section being connected to said shut-off valve and said pressure sensor, wherein a shut-off valve closing timer is started simultaneously with a closing of said shut-off valve, wherein said shut-off valve is opened when said shut-off valve closing timer reaches or exceeds a set time simultaneously with a first pressure being measured and stored as an initial pressure value by said pressure sensor while a diagnostic timer is started, wherein a second pressure is measured and stored as a final pressure value by said pressure sensor when said diagnostic timer reaches or exceeds a judging time, and wherein said shut-off valve is determined to be in a failure state when a pressure increase rate obtained from difference between said initial pressure value and said final pressure value is smaller than a pressure increase rate threshold value.