Fuel supply device for gaseous fuels

Abstract

To efficiently reduce a difference between an actual temperature and a target temperature of gaseous fuel.SOLUTION: A fuel supply device 200 for an internal combustion engine 10 includes fuel piping 40 for supplying gaseous fuel from a tank 20 to a fuel injection valve 15. A first heat exchanger 80 and a second heat exchanger 90 in which a temperature of a heating medium is lower than that of the first heat exchanger 80 are connected to the fuel piping 40. When an actual temperature of the gaseous fuel is lower than a target temperature of the gaseous fuel and a temperature difference between the actual temperature of the gaseous fuel and the target temperature of the gaseous fuel is large, a control device 100 executes processing for increasing a ratio of the amount of the gaseous fuel to be subjected to heat exchange in the first heat exchanger 80 out of the gaseous fuel to be subjected to heat exchange in the heat exchangers, compared to when the temperature difference is small.SELECTED DRAWING: Figure 1

Claims

1. A fuel supply device for gaseous fuel comprising: a tank for storing gaseous fuel; a fuel injection valve for supplying the gaseous fuel to the cylinders of an internal combustion engine; a fuel pipe connected to the tank; a delivery pipe for supplying the gaseous fuel from the fuel pipe to the fuel injection valve; and a temperature sensor for detecting the temperature of the gaseous fuel in the delivery pipe as the actual temperature of the gaseous fuel, A heat exchanger is connected to the fuel piping to perform heat exchange with the gaseous fuel. The heat exchanger includes a first heat exchanger and a second heat exchanger in which the temperature of the heat transfer medium is lower than that of the first heat exchanger. The system includes a control device that, when the actual temperature of the gaseous fuel is lower than the target temperature of the gaseous fuel, and the temperature difference between the actual temperature of the gaseous fuel and the target temperature of the gaseous fuel is large, performs a process to increase the proportion of the gaseous fuel that is heat-exchanged in the first heat exchanger compared to when the temperature difference is small. A fuel supply device for gaseous fuels.

2. The control device executes a process in which the gaseous fuel exchanges heat only with the second heat exchanger if the actual temperature of the gaseous fuel is higher than the target temperature of the gaseous fuel, and the temperature of the heat transfer medium in the second heat exchanger is lower than the actual temperature of the gaseous fuel. A fuel supply device for a gaseous fuel according to claim 1.

3. The control device performs a process to adjust the amount of the gaseous fuel that exchanges heat with the heat exchanger based on the temperature difference. A fuel supply device for a gaseous fuel according to claim 1.

4. The heat transfer medium of the first heat exchanger is the exhaust gas from the internal combustion engine. A fuel supply device for a gaseous fuel according to claim 1.

5. The heat transfer medium of the second heat exchanger is the cooling water of the internal combustion engine. A fuel supply device for a gaseous fuel according to claim 1.

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