Diesel fuel injection pump with electronically controlled fuel spilling and cutoff and recirculation venting of split fuel

Patent · Tue Jan 14 04:00:00 EST 1986

OSTI ID:6023445

Kobayashi, F; Ito, Y

This patent describes a fuel injection pump for a diesel engine. The pump consists of a number of intercommunicating parts. The first part is a housing containing a bore. Analogously, the patent describes a plunger slidably fitted in the bore for reciprocation with respect to housing in response to engine rotation, the bore defining a high pressure chamber at one end of the plunger. A first electromagnetic valve for shutting off fuel to the pump when the engine is not running, is also described and characterized as having an inlet adapted to be connected to a source of fuel at a relatively low pressure and an outlet. Connected to the outlet of the first electromagnetic valve is the upstream end of a fuel supply passage. The downstream end of the fuel supply leads to the high pressure chamber. A means for communicating the high pressure chamber with a fuel injection line substantially only when the plunger is moving in a second direction to reduce the size of the high pressure chamber is represented. Similarly, a means for selectively communicating the high pressure chamber with a vent passage in order to control the amount of fuel delivered during each fuel injection is described and is characterized as a principal feature of this patent. This selective modality of communication consists of two components. The first component is a second electromagnetic valve having an inlet connected to the high pressure chamber and an outlet connected to the fuel supply passage. The second component is a means for selectively opening the second electromagnetic valve to communicate the high pressure chamber with the fuel supply passage for a predetermined minimum time in response to the closing of the first electromagnetic valve.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Toyota
• Patent Number(s): US 4563992
• OSTI ID: 6023445
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
CONTAINERS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
DIESEL ENGINES
DIESEL FUELS
ELECTROMAGNETISM
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MAGNETISM
MECHANICAL STRUCTURES
MOTION
PETROLEUM PRODUCTS
POSITIONING
PRESSURE VESSELS
PUMPS
ROTATION
SIZE
SPECIFICATIONS
TIME MEASUREMENT
VALVES
VENTS