Multi-fuel injection system for an internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorYasuo Satou
Life of this patent
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Abstract
A multi-fuel injection system for an internal combustion engine having first and second fuel injection pumps for delivering first and second fuels, respectively, wherein a fuel injection nozzle has two fuel inlet passages. The first pump has a plurality of fuel outlets for delivering the first fuel into respective fuel inlet passages of the nozzle, one by one. The second pump has a single outlet from which the second fuel is delivered simultaneously into second fuel inlet passages of all nozzles except that which is forced in operation by the first pump. The second fuel is thus filled several times during one cycle of the engine to establish an averaged charge between the cylinders.
Claims22
A multi-fuel injection system for an internal combustion engine having a plurality of cylinders, said system comprising:
- a first fuel injection pump means having a plurality of fuel outlets for delivering a first fuel in a predetermined cycle under a pressure higher than a predetermined value;
- a second fuel injection pump means having a single fuel outlet and adapted to be driven synchronously with the first fuel injection pump means for delivering a second fuel under a pressure lower than said predetermined value;
- a plurality of fuel injection nozzles arranged one by one for each cylinder of the engine, each of said fuel injection nozzles comprising a body having a cavity therein, at least one fuel injection port for injecting the fuel from said cavity to the relevant cylinder, a valve seat about said fuel injection port, a valve member inserted in said body so as to engage with said valve seat to open or close said fuel injection port, a first and a second fuel inlet passages formed through said body for introducing said first and said second fuels into said cavity, respectively, and means for causing said valve member to open said fuel injection port when the pressure of the introduced fuel is higher than said predetermined value and to close said port when the pressure is lower than said predetermined value;
- a first set of fuel pipes for interconnecting the outlets of the first fuel injection pump means and the first inlet passages of the fuel injection nozzles one by one, respectively;
- a second set of fuel pipes each having one end thereof commonly connected to said single outlet of said second fuel injection pump means and the other end connected to the second fuel inlet passages of the fuel injection nozzles one by one;
- and
- means for preventing a backflow of the second fuel from each of said second inlet passages to said single outlet of said second fuel injection pump means.
Dependencies are inferred from the claim text.