Fuel supply apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMitsuto Sakai, Daichi Yamazaki, Tatsuhiko Akita, Naoki Kurata
Life of this patent
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Abstract
An ECU calculates the difference between the fuel pressure in a high-pressure distribution pipe and a target pressure when fuel is injected only from an air-intake passage injector. The ECU determines the bulk modulus of fuel that is associated with the coolant temperature. The ECU determines the amount of fuel that is to be discharged from a high-pressure pump based on the pressure difference and the bulk modulus. Then, the ECU actuates the high-pressure pump in accordance with the determined discharge amount.
Claims19
A fuel supply apparatus for an internal combustion engine, wherein the internal combustion engine includes a combustion chamber, an air intake passage connected to the combustion chamber, an in-cylinder injector for directly injecting fuel into the combustion chamber, an air-intake passage injector for injecting fuel into the air intake passage, a low-pressure pump for pumping fuel from a fuel tank and discharging low-pressure fuel, a low-pressure pipe for supplying the low-pressure fuel to the air-intake passage injector, a high-pressure pump for pressurizing the low-pressure fuel and discharging high-pressure fuel, and a high-pressure pipe for supplying the high-pressure fuel to the in-cylinder injector, the fuel supply apparatus comprising:
- a controller for controlling the high-pressure pump, wherein if the pressure of the fuel in the high-pressure pipe is lower than a target pressure by a predetermined value when the fuel is being injected only from the air-intake passage injector, the controller determines a discharge amount for the high-pressure pump that is necessary to raise the pressure of fuel in the high-pressure pipe to the target pressure, and the controller controls the high-pressure pump in accordance with the determined necessary discharge amount.
A fuel supply apparatus for an internal combustion engine, wherein the internal combustion engine includes a combustion chamber, an air intake passage connected to the combustion chamber, an in-cylinder injector for directly injecting fuel into the combustion chamber, an air-intake passage injector for injecting fuel into the air intake passage, a low-pressure pump for pumping fuel from a fuel tank and discharging low-pressure fuel, a low-pressure pipe for supplying the low-pressure fuel to the air-intake passage injector, a high-pressure pump for pressurizing the low-pressure fuel and discharging high-pressure fuel, and a high-pressure pipe for supplying the high-pressure fuel to the in-cylinder injector, the fuel supply apparatus comprising:
- a pressure sensor for detecting the pressure of the fuel in the high-pressure pipe and generating a detection signal according to the pressure;
- and
- a controller for controlling the high-pressure pump in accordance with the detection signal, wherein if the pressure of the fuel in the high-pressure pipe is lower than a tolerable range when the fuel is being injected only from the air-intake passage injector, the controller determines a discharge amount for the high-pressure pump that is necessary for the high-pressure pump to achieve the tolerable range, and the controller generates a drive signal for driving the high-pressure pump in accordance with the determined necessary discharge amount.
A fuel supply apparatus for an internal combustion engine, wherein the internal combustion engine includes a combustion chamber, an air intake passage connected to the combustion chamber, an in-cylinder injector for directly injecting fuel into the combustion chamber, an air-intake passage injector for injecting fuel into the air intake passage, a low-pressure pump for pumping fuel from a fuel tank and discharging low-pressure fuel, a low-pressure pipe for supplying the low-pressure fuel to the air-intake passage injector, a high-pressure pump for pressurizing the low-pressure fuel and discharging high-pressure fuel, and a high-pressure pipe for supplying the high-pressure fuel to the in-cylinder injector, the fuel supply apparatus comprising:
- a pressure sensor for detecting the pressure of the fuel in the high-pressure pipe and generating a detection signal according to the pressure;
- and
- a controller for controlling the high-pressure pump in accordance with the detection signal, wherein the controller is programmed to determine a discharge amount for the high-pressure pump that is necessary for the high-pressure pump to achieve the tolerable range if the pressure of the fuel in the high-pressure pipe is lower than a tolerable range during a period in which the in-cylinder injector stops injecting fuel, and to generate a drive signal for driving the high-pressure pump in accordance with the determined necessary discharge amount.
Dependencies are inferred from the claim text.