Internal-combustion engines – Starting device – With fuel or intake air control
Patent
1997-08-08
2000-02-15
Miller, Carl S.
Internal-combustion engines
Starting device
With fuel or intake air control
123479, 123514, 123456, F02N 1700
Patent
active
060240644
ABSTRACT:
In a high pressure fuel injection system, fuel is pumped up from a fuel tank by a low pressure pump and further pressurized by a high pressure pump. Pressurized fuel is accumulated in a common rail connected to injectors which inject fuel into an engine. A high pressure regulator is connected to the common rail to mechanically relieve excessive fuel pressure in the common rail or to electronically reduce the fuel pressure when required. An electronic control unit controls operation of the high pressure pump, the high pressure regulator and the injectors according to engine operating conditions which are fed to the unit from various sensors. The fuel pressure in the common rail is decreased by operation of the high pressure pump and the high pressure regulator either rapidly or gradually according to engine operating conditions. Vapor, including fuel and air, accumulated in the common rail under high ambient temperature is purged out quickly before the engine is stared by driving only the low pressure pump under command from the electronic control unit. The system is also provided with a "limp-home" function under which a car is driven back home even when some portions of the system fail or malfunction.
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Furuhashi Tsutomu
Kato Masaaki
Okajima Masahiro
Denso Corporation
Miller Carl S.
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