Internal combustion engine with optimized intake system
AssigneeDumarey Automotive Italia S.p.A.
InventorsFrancesco Concetto Pesce, Alberto Lorenzo Vassallo, Luca Buzzi
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Abstract
The present invention relates to an internal combustion engine provided with an optimized intake system. The engine derives from a traditional diesel cycle engine but is modified and optimized in its intake system to achieve performance superior to that of traditional diesel engines. According to the invention, some main characteristics of the timing system are modified to obtain, when required, a specific behavior of the intake valve lift curve. By operating in this way, it is possible to carry out an internal recirculation of the burnt gases, a reforming of the fuel (for example, from ammonia to hydrogen), a thermodynamic cycle similar to a Miller cycle.
Claims10
An internal combustion engine provided with a timing system (100) comprising:
- a camshaft (110) having at least one cam (120) for controlling an intake valve and at least one hydraulic tappet (140),
- a pressurized oil supply duct (141) and an oil inlet port (142) inside the at least one hydraulic tappet,
- an oil drain port (143) and an oil exhaust duct (144) in communication with the oil drain port (143),
- wherein:
- the at least one cam (120) has a first cam profile (122) and a second cam profile (123), the the second cam profile having a height (h2) greater than a height (h1) of the first cam profile (122),
- the oil drain port (143) has a height equal to the height difference between the second cam profile (123) and the first cam profile (122), and
- a control valve (160) is located in the oil exhaust duct (144) and is in selective fluid communication with the oil drain port (143) to control a lift curve of the intake valve.
Dependencies are inferred from the claim text.