Fuel supply apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTatsuhiko Akita, Naoki Kurata, Daichi Yamazaki, Mitsuto Sakai
Life of this patent
Estimating the term…
Abstract
The engine ECU executes a program including the step of detecting an engine coolant temperature, the step of detecting an engine speed and an engine load, the step of estimating a temperature at a tip end of an in-cylinder injector based on the engine coolant temperature, the engine speed and the engine load, and, when the temperature at the tip end is greater than a guaranteed temperature, the step of calculating a drive duty of a high-pressure fuel pump that ensures a decrease of the temperature at the tip end of the in-cylinder injector to the guaranteed temperature, and the step of controlling the high-pressure fuel pump using the drive duty.
Claims38
A fuel supply apparatus for an internal combustion engine having first fuel injection means for injecting fuel into a cylinder and second fuel injection means for injecting fuel into an intake manifold, comprising:
- temperature monitoring means for monitoring a temperature at a tip end of said first fuel injection means;
- and
- control means for increasing a quantity of the fuel circulated through a high-pressure fuel system supplying the fuel to said first fuel injection means when the temperature at the tip end obtained by said temperature monitoring means is not lower than a reference temperature.
A fuel supply apparatus for an internal combustion engine having first fuel injection means for injecting fuel into a cylinder, and second fuel injection means for injecting fuel into an intake manifold, comprising:
- pressure monitoring means for monitoring a pressure of the fuel in said first fuel injection means;
- relief means for externally relieving fuel within a delivery pipe to which said first fuel injection means is attached;
- and
- control means for actuating said relief means when the fuel pressure obtained by said pressure monitoring means is not lower than a reference pressure to relieve the fuel within said delivery pipe so as to decrease the fuel pressure, and for stopping said relief means when the fuel pressure becomes a critical pressure for fuel injection in minimum injection quantity of said first fuel injection means.
A fuel supply apparatus for an internal combustion engine having first fuel injection means for injecting fuel into a cylinder, and second fuel injection means for injecting fuel into an intake manifold, a high-pressure fuel system for supplying the fuel to said first fuel injection means including a high-pressure fuel pump, the fuel supply apparatus comprising:
- means for controlling the fuel injection means such that fuel injection is carried out using one or both of said first and second fuel injection means based on a condition required for said internal combustion engine;
- and
- control means for controlling said high-pressure fuel pump,
- said control means including means for controlling said high-pressure fuel pump such that the fuel is supplied from said high-pressure fuel pump even in a region where said first fuel injection means is stopped.
A fuel supply apparatus for an internal combustion engine having first fuel injection means for injecting fuel into a cylinder and second fuel injection means for injecting fuel into an intake manifold, a high-pressure fuel system for supplying the fuel to said first fuel injection means including a high-pressure fuel pump, the fuel supply apparatus comprising:
- means for controlling the fuel injection means such that fuel injection is carried out using one or both of said first and second fuel injection means based on a condition required for said internal combustion engine;
- estimating means for estimating a temperature at a tip end of said first fuel injection means;
- and
- control means for controlling said high-pressure fuel pump,
- said control means including means for controlling said high-pressure fuel pump such that the fuel is supplied from said high-pressure fuel pump based on said temperature at the tip end even when the quantity of the fuel injected from said first fuel injection means is decreased.
A fuel supply apparatus for an internal combustion engine having a first fuel injection mechanism for injecting fuel into a cylinder and a second fuel injection mechanism for injecting fuel into an intake manifold, comprising:
- a temperature monitoring unit for monitoring a temperature at a tip end of said first fuel injection mechanism;
- and
- a control unit for increasing a quantity of the fuel circulated through a high-pressure fuel system supplying the fuel to said first fuel injection mechanism when the temperature at the tip end obtained by said temperature monitoring unit is not lower than a reference temperature.
A fuel supply apparatus for an internal combustion engine having a first fuel injection mechanism for injecting fuel into a cylinder, and a second fuel injection mechanism for injecting fuel into an intake manifold, comprising:
- a pressure monitoring unit for monitoring a pressure of the fuel in said first fuel injection mechanism;
- a relief unit for externally relieving fuel within a delivery pipe to which said first fuel injection mechanism is attached;
- and
- a control unit for actuating said relief unit when the fuel pressure obtained by said pressure monitoring unit is not lower than a reference pressure to relieve the fuel within said delivery pipe so as to decrease the fuel pressure, and for stopping said relief unit when the fuel pressure becomes a critical pressure for fuel injection in minimum injection quantity of said first fuel injection mechanism.
A fuel supply apparatus for an internal combustion engine having a first fuel injection mechanism for injecting fuel into a cylinder, and a second fuel injection mechanism for injecting fuel into an intake manifold, a high-pressure fuel system for supplying the fuel to said first fuel injection mechanism including a high-pressure fuel pump, the fuel supply apparatus comprising:
- an injection control unit for controlling the fuel injection mechanisms such that fuel injection is carried out using one or both of said first and second fuel injection mechanisms based on a condition required for said internal combustion engine;
- and
- a control unit for controlling said high-pressure fuel pump,
- said control unit controlling said high-pressure fuel pump such that the fuel is supplied from said high-pressure fuel pump even in a region where said first fuel injection mechanism is stopped.
A fuel supply apparatus for an internal combustion engine having a first fuel injection mechanism for injecting fuel into a cylinder and a second fuel injection mechanism for injecting fuel into an intake manifold, a high-pressure fuel system for supplying the fuel to said first fuel injection mechanism including a high-pressure fuel pump, the fuel supply apparatus comprising:
- an injection control unit for controlling the fuel injection mechanisms such that fuel injection is carried out using one or both of said first and second fuel injection mechanisms based on a condition required for said internal combustion engine;
- an estimating unit for estimating a temperature at a tip end of said first fuel injection mechanism;
- and
- a control unit for controlling said high-pressure fuel pump,
- said control unit controlling said high-pressure fuel pump such that the fuel is supplied from said high-pressure fuel pump based on said temperature at the tip end even when the quantity of the fuel injected from said first fuel injection mechanism is decreased.
Dependencies are inferred from the claim text.