Abstract: A fuel tank system stores liquefied gas fuel to be supplied to an engine. The liquefied gas fuel is refueled to the fuel tank system by a fueling equipment. The fuel tank system includes: a first tank part having a connector portion connected with the fueling equipment and defining a first storage chamber into which the liquefied gas fuel sent from the fueling equipment flows; a second tank part defining a second storage chamber that stores the liquefied gas fuel separately from the first storage chamber; and a sending part that raises a pressure of the liquefied gas fuel stored in the first tank part and that sends the liquefied gas fuel with the raised pressure to the second tank part.

Abstract: An abnormality diagnosis apparatus is an apparatus that diagnoses a fuel leak from a fuel passage to circulate a liquefied gas fuel between a fuel tank and an internal combustion engine. The abnormality diagnosis apparatus includes: a control device; a low-pressure temperature sensor arranged at a discharge port of a feed pump; and a high-pressure temperature sensor arranged at an overflow fuel emission port of a supply pump. The control device detects a decrease in the temperature of the liquefied gas fuel at the overflow fuel emission port on the basis of a comparison between the measured values of the two temperature sensors, thereby determining that the fuel leak is caused in a section from the discharge port to the overflow fuel emission port.

Abstract: A fuel supply device includes a sub fuel tank disposed in a return fuel line, a pressure reduction valve, and a recirculation cutoff valve. When an internal combustion engine stops, the fuel supply device opens the pressure reduction valve and closes the recirculation cutoff valve. Due to this first transfer state, a liquefied gas fuel in a common rail is transferred to the sub fuel tank. Thereafter, the fuel supply device closes the pressure reduction valve and opens the recirculation cutoff valve. Due to this second transfer state, the liquefied gas fuel in the sub fuel tank is transferred to a main fuel tank. The fuel supply device repeatedly alternates between the first and second transfer states to collect the liquefied gas fuel from the common rail to the main fuel tank.

Abstract: An individual difference index is obtained based on the slope of variation ratios between a plurality of actual injection quantity and a target injection quantity. The individual difference index is stored as a learning value. An individual difference correction of the fuel injector is conducted based on the individual difference index. By using the individual difference index, a shot-dispersion is removed and individual-difference correction of the fuel injector can be conducted.

Abstract: A fuel supply device includes a sub fuel tank disposed in a return fuel line, a pressure reduction valve, and a recirculation cutoff valve. When an internal combustion engine stops, the fuel supply device opens the pressure reduction valve and closes the recirculation cutoff valve. Due to this first transfer state, a liquefied gas fuel in a common rail is transferred to the sub fuel tank. Thereafter, the fuel supply device closes the pressure reduction valve and opens the recirculation cutoff valve. Due to this second transfer state, the liquefied gas fuel in the sub fuel tank is transferred to a main fuel tank. The fuel supply device repeatedly alternates between the first and second transfer states to collect the liquefied gas fuel from the common rail to the main fuel tank.

Abstract: A fuel tank system stores liquefied gas fuel to be supplied to an engine. The liquefied gas fuel is refueled to the fuel tank system by a fueling equipment. The fuel tank system includes: a first tank part having a connector portion connected with the fueling equipment and defining a first storage chamber into which the liquefied gas fuel sent from the fueling equipment flows; a second tank part defining a second storage chamber that stores the liquefied gas fuel separately from the first storage chamber; and a sending part that raises a pressure of the liquefied gas fuel stored in the first tank part and that sends the liquefied gas fuel with the raised pressure to the second tank part.

Abstract: An abnormality diagnosis apparatus is an apparatus that diagnoses a fuel leak from a fuel passage to circulate a liquefied gas fuel between a fuel tank and an internal combustion engine. The abnormality diagnosis apparatus includes: a control device; a low-pressure temperature sensor arranged at a discharge port of a feed pump; and a high-pressure temperature sensor arranged at an overflow fuel emission port of a supply pump. The control device detects a decrease in the temperature of the liquefied gas fuel at the overflow fuel emission port on the basis of a comparison between the measured values of the two temperature sensors, thereby determining that the fuel leak is caused in a section from the discharge port to the overflow fuel emission port.

Abstract: An individual difference index is obtained based on the slope of variation ratios between a plurality of actual injection quantity and a target injection quantity. The individual difference index is stored as a learning value. An individual difference correction of the fuel injector is conducted based on the individual difference index. By using the individual difference index, a shot-dispersion is removed and individual-difference correction of the fuel injector can be conducted.

Abstract: A control unit obtains approximation straight lines before and during the fuel injection with respect to a first injection and a second injection among multiple fuel injections based on a pressure variation in the fuel accumulator which is sampled by the pressure sensor. The control unit employs data of which correlation coefficient is higher among a pilot injection and a main injection and obtains a hypothetical injection-start point accurately. Based on the variation amount of the hypothetical injection start delay which is obtained from the hypothetical injection-start point, an energization-start timing and the target-energization period are corrected.