초록 ▼

A method of operating a fuel delivery system for an internal combustion engine is described. The method may include, after or during engine shutdown, and during a fuel system cool down, activating the first pump; and varying the activation of the first pump responsive to temperature to maintain a hi

A method of operating a fuel delivery system for an internal combustion engine is described. The method may include, after or during engine shutdown, and during a fuel system cool down, activating the first pump; and varying the activation of the first pump responsive to temperature to maintain a higher pressure for high temperatures. By utilizing the pump to generate increased pressure at an appropriate condition during the cool down, for example, the pressures in the system can be managed to reduce the likelihood of fuel migrating to the rail.

대표청구항 ▼

The invention claimed is: 1. A method of operating a fuel delivery system for an internal combustion engine, the system including a plurality of direct cylinder injectors, a fuel rail upstream of the injectors, a first pump, and a second pump coupled downstream of the first pump and coupled to the f

The invention claimed is: 1. A method of operating a fuel delivery system for an internal combustion engine, the system including a plurality of direct cylinder injectors, a fuel rail upstream of the injectors, a first pump, and a second pump coupled downstream of the first pump and coupled to the fuel rail, comprising:after or during engine shutdown, and during a fuel system cool down, activating the first pump; andvarying the activation of the first pump responsive to temperature to maintain a higher pressure for high temperatures, including operating the first pump when a measured or predicted pressure upstream of the fuel injectors is below a trip pressure, the trip pressure decreasing with a decreasing temperature.