Fuel injection device of cylinder injection type internal combustion engine and fuel injection method thereof
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTomihisa Tsuchiya
Life of this patent
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Abstract
A fuel injection device and method includes a main injection valve that injects a high-pressure fuel supplied to a delivery pipe into each combustion chamber of an engine, and an auxiliary fuel injection valve supplied with the high-pressure fuel from the delivery pipe. The auxiliary fuel injection valve is capable of injecting the high-pressure fuel in sucked air flowing in a surge tank when the engine is started under cold conditions. In addition, a fuel pressure can rapidly be increased in a starting phase since vapor in the delivery pipe can be discharged by temporarily opening the auxiliary fuel injection valve.
Claims25
A fuel injection device of a cylinder injection type engine, comprising:
- a high-pressure fuel channel being supplied with a fuel by a high-pressure fuel pump that pressurizes a low-pressure fuel supplied from a fuel supplying pump;
- a main fuel injection valve connected to the high-pressure fuel channel, the main fuel injection valve injects a high-pressure fuel in the high-pressure fuel channel into each combustion chamber of the engine with plural cylinders;
- and
- an auxiliary fuel injection valve provided at an intake channel upstream of a branched point of the intake channel extending to each cylinder to inject the fuel thereto, the auxiliary fuel injection valve is supplied with the high-pressure fuel from the high-pressure fuel channel.
A fuel injection method of a cylinder injection type engine which includes:
- a main fuel injection valve that injects a fuel into each combustion chamber of the engine with plural cylinders, and pressurizes a low pressure fuel from a fuel supplying pump by a high-pressure fuel pump to supply a high-pressure fuel to a high-pressure fuel channel, supplying the high-pressure fuel to the main fuel injection valve from the high-pressure fuel channel, comprising steps of:
- closing the main fuel injection valve to cut off fuel injection into each combustion chamber;
- and
- injecting the high-pressure fuel in an intake channel, upstream of a branched point of the intake channel extending to each cylinder, through an auxiliary fuel injection valve from the high-pressure fuel channel when the fuel from the main fuel injection valve is cut off.
Dependencies are inferred from the claim text.